Aren
/
NetBSD
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
NetBSD/sys/dist/ipf/netinet/fil.c

6065 lines
181 KiB
C
Raw Blame History

/* $NetBSD: fil.c,v 1.8 2005/02/08 07:01:55 martti Exp $ */
/*
* Copyright (C) 1993-2003 by Darren Reed.
*
* See the IPFILTER.LICENCE file for details on licencing.
*/
#if defined(KERNEL) || defined(_KERNEL)
# undef KERNEL
# undef _KERNEL
# define KERNEL 1
# define _KERNEL 1
#endif
#include <sys/errno.h>
#include <sys/types.h>
#include <sys/param.h>
#include <sys/time.h>
#if defined(__NetBSD__)
# if (NetBSD >= 199905) && !defined(IPFILTER_LKM) && defined(_KERNEL)
# include "opt_ipfilter_log.h"
# endif
#endif
#if defined(_KERNEL) && defined(__FreeBSD_version) && \
(__FreeBSD_version >= 220000)
# if (__FreeBSD_version >= 400000)
# if !defined(IPFILTER_LKM)
# include "opt_inet6.h"
# endif
# if (__FreeBSD_version == 400019)
# define CSUM_DELAY_DATA
# endif
# endif
# include <sys/filio.h>
#else
# include <sys/ioctl.h>
#endif
#include <sys/fcntl.h>
#if defined(_KERNEL)
# include <sys/systm.h>
# include <sys/file.h>
#else
# include <stdio.h>
# include <string.h>
# include <stdlib.h>
# include <stddef.h>
# include <sys/file.h>
# define _KERNEL
# ifdef __OpenBSD__
struct file;
# endif
# include <sys/uio.h>
# undef _KERNEL
#endif
#if !defined(__SVR4) && !defined(__svr4__) && !defined(__hpux) && \
!defined(linux)
# include <sys/mbuf.h>
#else
# if !defined(linux)
# include <sys/byteorder.h>
# endif
# if (SOLARIS2 < 5) && defined(sun)
# include <sys/dditypes.h>
# endif
#endif
#ifdef __hpux
# define _NET_ROUTE_INCLUDED
#endif
#if !defined(linux)
# include <sys/protosw.h>
#endif
#include <sys/socket.h>
#include <net/if.h>
#ifdef sun
# include <net/af.h>
#endif
#if !defined(_KERNEL) && defined(__FreeBSD__)
# include "radix_ipf.h"
#endif
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#if !defined(linux)
# include <netinet/ip_var.h>
#endif
#if defined(__sgi) && defined(IFF_DRVRLOCK) /* IRIX 6 */
# include <sys/hashing.h>
# include <netinet/in_var.h>
#endif
#include <netinet/tcp.h>
#if !defined(__sgi) || defined(_KERNEL)
# include <netinet/udp.h>
# include <netinet/ip_icmp.h>
#endif
#ifdef __hpux
# undef _NET_ROUTE_INCLUDED
#endif
#include "netinet/ip_compat.h"
#ifdef USE_INET6
# include <netinet/icmp6.h>
# if !SOLARIS && defined(_KERNEL) && !defined(__osf__) && !defined(__hpux)
# include <netinet6/in6_var.h>
# endif
#endif
#include <netinet/tcpip.h>
#include "netinet/ip_fil.h"
#include "netinet/ip_nat.h"
#include "netinet/ip_frag.h"
#include "netinet/ip_state.h"
#include "netinet/ip_proxy.h"
#include "netinet/ip_auth.h"
#ifdef IPFILTER_SCAN
# include "netinet/ip_scan.h"
#endif
#ifdef IPFILTER_SYNC
# include "netinet/ip_sync.h"
#endif
#include "netinet/ip_pool.h"
#include "netinet/ip_htable.h"
#ifdef IPFILTER_COMPILED
# include "netinet/ip_rules.h"
#endif
#if defined(IPFILTER_BPF) && defined(_KERNEL)
# include <net/bpf.h>
#endif
#if defined(__FreeBSD_version) && (__FreeBSD_version >= 300000)
# include <sys/malloc.h>
# if defined(_KERNEL) && !defined(IPFILTER_LKM)
# include "opt_ipfilter.h"
# endif
#endif
#include "netinet/ipl.h"
/* END OF INCLUDES */
#if !defined(lint)
#if defined(__NetBSD__)
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: fil.c,v 1.8 2005/02/08 07:01:55 martti Exp $");
#else
static const char sccsid[] = "@(#)fil.c 1.36 6/5/96 (C) 1993-2000 Darren Reed";
static const char rcsid[] = "@(#)Id: fil.c,v 2.243.2.46 2005/01/09 01:20:03 darrenr Exp";
#endif
#endif
#ifndef _KERNEL
# include "ipf.h"
# include "ipt.h"
# include "bpf-ipf.h"
extern int opts;
# define FR_VERBOSE(verb_pr) verbose verb_pr
# define FR_DEBUG(verb_pr) debug verb_pr
#else /* #ifndef _KERNEL */
# define FR_VERBOSE(verb_pr)
# define FR_DEBUG(verb_pr)
#endif /* _KERNEL */
fr_info_t frcache[2][8];
struct filterstats frstats[2] = { { 0, 0, 0, 0, 0 }, { 0, 0, 0, 0, 0 } };
struct frentry *ipfilter[2][2] = { { NULL, NULL }, { NULL, NULL } },
*ipfilter6[2][2] = { { NULL, NULL }, { NULL, NULL } },
*ipacct6[2][2] = { { NULL, NULL }, { NULL, NULL } },
*ipacct[2][2] = { { NULL, NULL }, { NULL, NULL } },
*ipnatrules[2][2] = { { NULL, NULL }, { NULL, NULL } };
struct frgroup *ipfgroups[IPL_LOGSIZE][2];
char ipfilter_version[] = IPL_VERSION;
int fr_refcnt = 0;
/*
* For fr_running:
* 0 == loading, 1 = running, -1 = disabled, -2 = unloading
*/
int fr_running = 0;
int fr_flags = IPF_LOGGING;
int fr_active = 0;
int fr_control_forwarding = 0;
int fr_update_ipid = 0;
u_short fr_ip_id = 0;
int fr_chksrc = 0; /* causes a system crash if enabled */
int fr_minttl = 4;
u_long fr_frouteok[2] = {0, 0};
u_long fr_userifqs = 0;
u_long fr_badcoalesces[2] = {0, 0};
u_char ipf_iss_secret[32];
#if defined(IPFILTER_DEFAULT_BLOCK)
int fr_pass = FR_BLOCK|FR_NOMATCH;
#else
int fr_pass = (IPF_DEFAULT_PASS)|FR_NOMATCH;
#endif
int fr_features = 0
#ifdef IPFILTER_LKM
| IPF_FEAT_LKM
#endif
#ifdef IPFILTER_LOG
| IPF_FEAT_LOG
#endif
#ifdef IPFILTER_LOOKUP
| IPF_FEAT_LOOKUP
#endif
#ifdef IPFILTER_BPF
| IPF_FEAT_BPF
#endif
#ifdef IPFILTER_COMPILED
| IPF_FEAT_COMPILED
#endif
#ifdef IPFILTER_CKSUM
| IPF_FEAT_CKSUM
#endif
#ifdef IPFILTER_SYNC
| IPF_FEAT_SYNC
#endif
#ifdef IPFILTER_SCAN
| IPF_FEAT_SCAN
#endif
#ifdef USE_INET6
| IPF_FEAT_IPV6
#endif
;
static INLINE int fr_ipfcheck __P((fr_info_t *, frentry_t *, int));
static int fr_portcheck __P((frpcmp_t *, u_short *));
static int frflushlist __P((int, minor_t, int *, frentry_t **));
static ipfunc_t fr_findfunc __P((ipfunc_t));
static frentry_t *fr_firewall __P((fr_info_t *, u_32_t *));
static int fr_funcinit __P((frentry_t *fr));
static INLINE void frpr_esp __P((fr_info_t *));
static INLINE void frpr_gre __P((fr_info_t *));
static INLINE void frpr_udp __P((fr_info_t *));
static INLINE void frpr_tcp __P((fr_info_t *));
static INLINE void frpr_icmp __P((fr_info_t *));
static INLINE void frpr_ipv4hdr __P((fr_info_t *));
static INLINE int frpr_pullup __P((fr_info_t *, int));
static INLINE void frpr_short __P((fr_info_t *, int));
static INLINE void frpr_tcpcommon __P((fr_info_t *));
static INLINE void frpr_udpcommon __P((fr_info_t *));
static INLINE int fr_updateipid __P((fr_info_t *));
#ifdef IPFILTER_LOOKUP
static int fr_grpmapinit __P((frentry_t *fr));
static INLINE void *fr_resolvelookup __P((u_int, u_int, lookupfunc_t *));
#endif
static void frsynclist __P((frentry_t *, void *));
static ipftuneable_t *fr_findtunebyname __P((char *));
static ipftuneable_t *fr_findtunebycookie __P((void *, void **));
/*
* bit values for identifying presence of individual IP options
* All of these tables should be ordered by increasing key value on the left
* hand side to allow for binary searching of the array and include a trailer
* with a 0 for the bitmask for linear searches to easily find the end with.
*/
const struct optlist ipopts[20] = {
{ IPOPT_NOP, 0x000001 },
{ IPOPT_RR, 0x000002 },
{ IPOPT_ZSU, 0x000004 },
{ IPOPT_MTUP, 0x000008 },
{ IPOPT_MTUR, 0x000010 },
{ IPOPT_ENCODE, 0x000020 },
{ IPOPT_TS, 0x000040 },
{ IPOPT_TR, 0x000080 },
{ IPOPT_SECURITY, 0x000100 },
{ IPOPT_LSRR, 0x000200 },
{ IPOPT_E_SEC, 0x000400 },
{ IPOPT_CIPSO, 0x000800 },
{ IPOPT_SATID, 0x001000 },
{ IPOPT_SSRR, 0x002000 },
{ IPOPT_ADDEXT, 0x004000 },
{ IPOPT_VISA, 0x008000 },
{ IPOPT_IMITD, 0x010000 },
{ IPOPT_EIP, 0x020000 },
{ IPOPT_FINN, 0x040000 },
{ 0, 0x000000 }
};
#ifdef USE_INET6
struct optlist ip6exthdr[] = {
{ IPPROTO_HOPOPTS, 0x000001 },
{ IPPROTO_IPV6, 0x000002 },
{ IPPROTO_ROUTING, 0x000004 },
{ IPPROTO_FRAGMENT, 0x000008 },
{ IPPROTO_ESP, 0x000010 },
{ IPPROTO_AH, 0x000020 },
{ IPPROTO_NONE, 0x000040 },
{ IPPROTO_DSTOPTS, 0x000080 },
{ 0, 0 }
};
#endif
struct optlist tcpopts[] = {
{ TCPOPT_NOP, 0x000001 },
{ TCPOPT_MAXSEG, 0x000002 },
{ TCPOPT_WINDOW, 0x000004 },
{ TCPOPT_SACK_PERMITTED, 0x000008 },
{ TCPOPT_SACK, 0x000010 },
{ TCPOPT_TIMESTAMP, 0x000020 },
{ 0, 0x000000 }
};
/*
* bit values for identifying presence of individual IP security options
*/
const struct optlist secopt[8] = {
{ IPSO_CLASS_RES4, 0x01 },
{ IPSO_CLASS_TOPS, 0x02 },
{ IPSO_CLASS_SECR, 0x04 },
{ IPSO_CLASS_RES3, 0x08 },
{ IPSO_CLASS_CONF, 0x10 },
{ IPSO_CLASS_UNCL, 0x20 },
{ IPSO_CLASS_RES2, 0x40 },
{ IPSO_CLASS_RES1, 0x80 }
};
/*
* Table of functions available for use with call rules.
*/
static ipfunc_resolve_t fr_availfuncs[] = {
#ifdef IPFILTER_LOOKUP
{ "fr_srcgrpmap", fr_srcgrpmap, fr_grpmapinit },
{ "fr_dstgrpmap", fr_dstgrpmap, fr_grpmapinit },
#endif
{ "", NULL }
};
/*
* The next section of code is a a collection of small routines that set
* fields in the fr_info_t structure passed based on properties of the
* current packet. There are different routines for the same protocol
* for each of IPv4 and IPv6. Adding a new protocol, for which there
* will "special" inspection for setup, is now more easily done by adding
* a new routine and expanding the frpr_ipinit*() function rather than by
* adding more code to a growing switch statement.
*/
#ifdef USE_INET6
static INLINE void frpr_udp6 __P((fr_info_t *));
static INLINE void frpr_tcp6 __P((fr_info_t *));
static INLINE void frpr_icmp6 __P((fr_info_t *));
static INLINE void frpr_ipv6hdr __P((fr_info_t *));
static INLINE void frpr_short6 __P((fr_info_t *, int));
static INLINE int frpr_hopopts6 __P((fr_info_t *));
static INLINE int frpr_routing6 __P((fr_info_t *));
static INLINE int frpr_dstopts6 __P((fr_info_t *));
static INLINE int frpr_fragment6 __P((fr_info_t *));
/* ------------------------------------------------------------------------ */
/* Function: frpr_short6 */
/* Returns: void */
/* Parameters: fin(I) - pointer to packet information */
/* */
/* IPv6 Only */
/* This is function enforces the 'is a packet too short to be legit' rule */
/* for IPv6 and marks the packet with FI_SHORT if so. See function comment */
/* for frpr_short() for more details. */
/* ------------------------------------------------------------------------ */
static INLINE void frpr_short6(fin, min)
fr_info_t *fin;
int min;
{
fr_ip_t *fi = &fin->fin_fi;
int off;
off = fin->fin_off;
if (off == 0) {
if (fin->fin_plen < fin->fin_hlen + min)
fi->fi_flx |= FI_SHORT;
}
}
/* ------------------------------------------------------------------------ */
/* Function: frpr_ipv6hdr */
/* Returns: void */
/* Parameters: fin(I) - pointer to packet information */
/* */
/* IPv6 Only */
/* Copy values from the IPv6 header into the fr_info_t struct and call the */
/* per-protocol analyzer if it exists. */
/* ------------------------------------------------------------------------ */
static INLINE void frpr_ipv6hdr(fin)
fr_info_t *fin;
{
int p, go = 1, i, hdrcount, coalesced;
ip6_t *ip6 = (ip6_t *)fin->fin_ip;
fr_ip_t *fi = &fin->fin_fi;
fin->fin_off = 0;
fi->fi_tos = 0;
fi->fi_optmsk = 0;
fi->fi_secmsk = 0;
fi->fi_auth = 0;
coalesced = (fin->fin_flx & FI_COALESCE) ? 1 : 0;
p = ip6->ip6_nxt;
fi->fi_ttl = ip6->ip6_hlim;
fi->fi_src.in6 = ip6->ip6_src;
fi->fi_dst.in6 = ip6->ip6_dst;
fin->fin_id = (u_short)(ip6->ip6_flow & 0xffff);
hdrcount = 0;
while (go && !(fin->fin_flx & (FI_BAD|FI_SHORT))) {
switch (p)
{
case IPPROTO_UDP :
frpr_udp6(fin);
go = 0;
break;
case IPPROTO_TCP :
frpr_tcp6(fin);
go = 0;
break;
case IPPROTO_ICMPV6 :
frpr_icmp6(fin);
go = 0;
break;
case IPPROTO_GRE :
frpr_gre(fin);
go = 0;
break;
case IPPROTO_HOPOPTS :
/*
* Actually, hop by hop header is only allowed right
* after IPv6 header!
*/
if (hdrcount != 0)
fin->fin_flx |= FI_BAD;
if (coalesced == 0) {
coalesced = fr_coalesce(fin);
if (coalesced != 1)
return;
}
p = frpr_hopopts6(fin);
break;
case IPPROTO_DSTOPTS :
if (coalesced == 0) {
coalesced = fr_coalesce(fin);
if (coalesced != 1)
return;
}
p = frpr_dstopts6(fin);
break;
case IPPROTO_ROUTING :
if (coalesced == 0) {
coalesced = fr_coalesce(fin);
if (coalesced != 1)
return;
}
p = frpr_routing6(fin);
break;
case IPPROTO_ESP :
frpr_esp(fin);
/*FALLTHROUGH*/
case IPPROTO_AH :
case IPPROTO_IPV6 :
for (i = 0; ip6exthdr[i].ol_bit != 0; i++)
if (ip6exthdr[i].ol_val == p) {
fin->fin_flx |= ip6exthdr[i].ol_bit;
break;
}
go = 0;
break;
case IPPROTO_NONE :
go = 0;
break;
case IPPROTO_FRAGMENT :
if (coalesced == 0) {
coalesced = fr_coalesce(fin);
if (coalesced != 1)
return;
}
p = frpr_fragment6(fin);
break;
default :
go = 0;
break;
}
hdrcount++;
}
fi->fi_p = p;
}
/* ------------------------------------------------------------------------ */
/* Function: frpr_hopopts6 */
/* Returns: int - value of the next header or IPPROTO_NONE if error */
/* Parameters: fin(I) - pointer to packet information */
/* */
/* IPv6 Only */
/* This is function checks pending hop by hop options extension header */
/* ------------------------------------------------------------------------ */
static INLINE int frpr_hopopts6(fin)
fr_info_t *fin;
{
struct ip6_ext *hdr;
u_short shift;
int i;
fin->fin_flx |= FI_V6EXTHDR;
/* 8 is default length of extension hdr */
if ((fin->fin_dlen - 8) < 0) {
fin->fin_flx |= FI_SHORT;
return IPPROTO_NONE;
}
if (frpr_pullup(fin, 8) == -1)
return IPPROTO_NONE;
hdr = fin->fin_dp;
shift = 8 + (hdr->ip6e_len << 3);
if (shift > fin->fin_dlen) { /* Nasty extension header length? */
fin->fin_flx |= FI_BAD;
return IPPROTO_NONE;
}
for (i = 0; ip6exthdr[i].ol_bit != 0; i++)
if (ip6exthdr[i].ol_val == IPPROTO_HOPOPTS) {
fin->fin_optmsk |= ip6exthdr[i].ol_bit;
break;
}
fin->fin_dp = (char *)fin->fin_dp + shift;
fin->fin_dlen -= shift;
return hdr->ip6e_nxt;
}
/* ------------------------------------------------------------------------ */
/* Function: frpr_routing6 */
/* Returns: int - value of the next header or IPPROTO_NONE if error */
/* Parameters: fin(I) - pointer to packet information */
/* */
/* IPv6 Only */
/* This is function checks pending routing extension header */
/* ------------------------------------------------------------------------ */
static INLINE int frpr_routing6(fin)
fr_info_t *fin;
{
struct ip6_ext *hdr;
u_short shift;
int i;
fin->fin_flx |= FI_V6EXTHDR;
/* 8 is default length of extension hdr */
if ((fin->fin_dlen - 8) < 0) {
fin->fin_flx |= FI_SHORT;
return IPPROTO_NONE;
}
if (frpr_pullup(fin, 8) == -1)
return IPPROTO_NONE;
hdr = fin->fin_dp;
shift = 8 + (hdr->ip6e_len << 3);
/*
* Nasty extension header length?
*/
if ((shift > fin->fin_dlen) || (shift < sizeof(struct ip6_hdr)) ||
((shift - sizeof(struct ip6_hdr)) & 15)) {
fin->fin_flx |= FI_BAD;
return IPPROTO_NONE;
}
for (i = 0; ip6exthdr[i].ol_bit != 0; i++)
if (ip6exthdr[i].ol_val == IPPROTO_ROUTING) {
fin->fin_optmsk |= ip6exthdr[i].ol_bit;
break;
}
fin->fin_dp = (char *)fin->fin_dp + shift;
fin->fin_dlen -= shift;
return hdr->ip6e_nxt;
}
/* ------------------------------------------------------------------------ */
/* Function: frpr_fragment6 */
/* Returns: int - value of the next header or IPPROTO_NONE if error */
/* Parameters: fin(I) - pointer to packet information */
/* */
/* IPv6 Only */
/* Examine the IPv6 fragment header and extract fragment offset information.*/
/* ------------------------------------------------------------------------ */
static INLINE int frpr_fragment6(fin)
fr_info_t *fin;
{
struct ip6_frag *frag;
struct ip6_ext *hdr;
int i;
fin->fin_flx |= (FI_FRAG|FI_V6EXTHDR);
/*
* Only one frgament header is allowed per IPv6 packet but it need
* not be the first nor last (not possible in some cases.)
*/
for (i = 0; ip6exthdr[i].ol_bit != 0; i++)
if (ip6exthdr[i].ol_val == IPPROTO_FRAGMENT)
break;
if (fin->fin_optmsk & ip6exthdr[i].ol_bit) {
fin->fin_flx |= FI_BAD;
return IPPROTO_NONE;
}
fin->fin_optmsk |= ip6exthdr[i].ol_bit;
if (frpr_pullup(fin, 8) == -1)
return IPPROTO_NONE;
hdr = fin->fin_dp;
/*
* Length must be zero, i.e. it has no length.
*/
if (hdr->ip6e_len != 0) {
fin->fin_flx |= FI_BAD;
return IPPROTO_NONE;
}
if ((int)(fin->fin_dlen - sizeof(*frag)) < 0) {
fin->fin_flx |= FI_SHORT;
return IPPROTO_NONE;
}
frag = fin->fin_dp;
fin->fin_off = frag->ip6f_offlg & IP6F_OFF_MASK;
fin->fin_off <<= 3;
if (fin->fin_off != 0)
fin->fin_flx |= FI_FRAGBODY;
fin->fin_dp = (char *)fin->fin_dp + sizeof(*frag);
fin->fin_dlen -= sizeof(*frag);
return frag->ip6f_nxt;
}
/* ------------------------------------------------------------------------ */
/* Function: frpr_dstopts6 */
/* Returns: int - value of the next header or IPPROTO_NONE if error */
/* Parameters: fin(I) - pointer to packet information */
/* nextheader(I) - stores next header value */
/* */
/* IPv6 Only */
/* This is function checks pending destination options extension header */
/* ------------------------------------------------------------------------ */
static INLINE int frpr_dstopts6(fin)
fr_info_t *fin;
{
struct ip6_ext *hdr;
u_short shift;
int i;
/* 8 is default length of extension hdr */
if ((fin->fin_dlen - 8) < 0) {
fin->fin_flx |= FI_SHORT;
return IPPROTO_NONE;
}
if (frpr_pullup(fin, 8) == -1)
return IPPROTO_NONE;
hdr = fin->fin_dp;
shift = 8 + (hdr->ip6e_len << 3);
if (shift > fin->fin_dlen) { /* Nasty extension header length? */
fin->fin_flx |= FI_BAD;
return IPPROTO_NONE;
}
for (i = 0; ip6exthdr[i].ol_bit != 0; i++)
if (ip6exthdr[i].ol_val == IPPROTO_DSTOPTS)
break;
fin->fin_optmsk |= ip6exthdr[i].ol_bit;
fin->fin_dp = (char *)fin->fin_dp + shift;
fin->fin_dlen -= shift;
return hdr->ip6e_nxt;
}
/* ------------------------------------------------------------------------ */
/* Function: frpr_icmp6 */
/* Returns: void */
/* Parameters: fin(I) - pointer to packet information */
/* */
/* IPv6 Only */
/* This routine is mainly concerned with determining the minimum valid size */
/* for an ICMPv6 packet. */
/* ------------------------------------------------------------------------ */
static INLINE void frpr_icmp6(fin)
fr_info_t *fin;
{
int minicmpsz = sizeof(struct icmp6_hdr);
struct icmp6_hdr *icmp6;
if (frpr_pullup(fin, ICMP6ERR_MINPKTLEN + 8 - sizeof(ip6_t)) == -1)
return;
if (fin->fin_dlen > 1) {
icmp6 = fin->fin_dp;
fin->fin_data[0] = *(u_short *)icmp6;
switch (icmp6->icmp6_type)
{
case ICMP6_ECHO_REPLY :
case ICMP6_ECHO_REQUEST :
minicmpsz = ICMP6ERR_MINPKTLEN - sizeof(ip6_t);
break;
case ICMP6_DST_UNREACH :
case ICMP6_PACKET_TOO_BIG :
case ICMP6_TIME_EXCEEDED :
case ICMP6_PARAM_PROB :
if ((fin->fin_m != NULL) &&
(M_LEN(fin->fin_m) < fin->fin_plen)) {
if (fr_coalesce(fin) != 1)
return;
}
fin->fin_flx |= FI_ICMPERR;
minicmpsz = ICMP6ERR_IPICMPHLEN - sizeof(ip6_t);
break;
default :
break;
}
}
frpr_short(fin, minicmpsz);
}
/* ------------------------------------------------------------------------ */
/* Function: frpr_udp6 */
/* Returns: void */
/* Parameters: fin(I) - pointer to packet information */
/* */
/* IPv6 Only */
/* Analyse the packet for IPv6/UDP properties. */
/* ------------------------------------------------------------------------ */
static INLINE void frpr_udp6(fin)
fr_info_t *fin;
{
fr_checkv6sum(fin);
frpr_short(fin, sizeof(struct udphdr));
frpr_udpcommon(fin);
}
/* ------------------------------------------------------------------------ */
/* Function: frpr_tcp6 */
/* Returns: void */
/* Parameters: fin(I) - pointer to packet information */
/* */
/* IPv6 Only */
/* Analyse the packet for IPv6/TCP properties. */
/* ------------------------------------------------------------------------ */
static INLINE void frpr_tcp6(fin)
fr_info_t *fin;
{
fr_checkv6sum(fin);
frpr_short(fin, sizeof(struct tcphdr));
frpr_tcpcommon(fin);
}
#endif /* USE_INET6 */
/* ------------------------------------------------------------------------ */
/* Function: frpr_pullup */
/* Returns: int - 0 == pullup succeeded, -1 == failure */
/* Parameters: fin(I) - pointer to packet information */
/* plen(I) - length (excluding L3 header) to pullup */
/* */
/* Short inline function to cut down on code duplication to perform a call */
/* to fr_pullup to ensure there is the required amount of data, */
/* consecutively in the packet buffer. */
/* ------------------------------------------------------------------------ */
static INLINE int frpr_pullup(fin, plen)
fr_info_t *fin;
int plen;
{
#if defined(_KERNEL)
if (fin->fin_m != NULL) {
if (fin->fin_dp != NULL)
plen += (char *)fin->fin_dp -
((char *)fin->fin_ip + fin->fin_hlen);
plen += fin->fin_hlen;
if (M_LEN(fin->fin_m) < plen) {
if (fr_pullup(fin->fin_m, fin, plen) == NULL)
return -1;
}
}
#endif
return 0;
}
/* ------------------------------------------------------------------------ */
/* Function: frpr_short */
/* Returns: void */
/* Parameters: fin(I) - pointer to packet information */
/* min(I) - minimum header size */
/* */
/* Check if a packet is "short" as defined by min. The rule we are */
/* applying here is that the packet must not be fragmented within the layer */
/* 4 header. That is, it must not be a fragment that has its offset set to */
/* start within the layer 4 header (hdrmin) or if it is at offset 0, the */
/* entire layer 4 header must be present (min). */
/* ------------------------------------------------------------------------ */
static INLINE void frpr_short(fin, min)
fr_info_t *fin;
int min;
{
fr_ip_t *fi = &fin->fin_fi;
int off;
off = fin->fin_off;
if (off == 0) {
if (fin->fin_plen < fin->fin_hlen + min)
fi->fi_flx |= FI_SHORT;
} else if (off < min) {
fi->fi_flx |= FI_SHORT;
}
}
/* ------------------------------------------------------------------------ */
/* Function: frpr_icmp */
/* Returns: void */
/* Parameters: fin(I) - pointer to packet information */
/* */
/* IPv4 Only */
/* Do a sanity check on the packet for ICMP (v4). In nearly all cases, */
/* except extrememly bad packets, both type and code will be present. */
/* The expected minimum size of an ICMP packet is very much dependant on */
/* the type of it. */
/* */
/* XXX - other ICMP sanity checks? */
/* ------------------------------------------------------------------------ */
static INLINE void frpr_icmp(fin)
fr_info_t *fin;
{
int minicmpsz = sizeof(struct icmp);
icmphdr_t *icmp;
if (frpr_pullup(fin, ICMPERR_ICMPHLEN) == -1)
return;
fr_checkv4sum(fin);
if (!fin->fin_off && (fin->fin_dlen > 1)) {
icmp = fin->fin_dp;
fin->fin_data[0] = *(u_short *)icmp;
switch (icmp->icmp_type)
{
case ICMP_ECHOREPLY :
case ICMP_ECHO :
/* Router discovery messaes - RFC 1256 */
case ICMP_ROUTERADVERT :
case ICMP_ROUTERSOLICIT :
minicmpsz = ICMP_MINLEN;
break;
/*
* type(1) + code(1) + cksum(2) + id(2) seq(2) +
* 3 * timestamp(3 * 4)
*/
case ICMP_TSTAMP :
case ICMP_TSTAMPREPLY :
minicmpsz = 20;
break;
/*
* type(1) + code(1) + cksum(2) + id(2) seq(2) +
* mask(4)
*/
case ICMP_MASKREQ :
case ICMP_MASKREPLY :
minicmpsz = 12;
break;
/*
* type(1) + code(1) + cksum(2) + id(2) seq(2) + ip(20+)
*/
case ICMP_UNREACH :
case ICMP_SOURCEQUENCH :
case ICMP_REDIRECT :
case ICMP_TIMXCEED :
case ICMP_PARAMPROB :
if (fr_coalesce(fin) != 1)
return;
fin->fin_flx |= FI_ICMPERR;
break;
default :
break;
}
if (fin->fin_dlen >= 6) /* ID field */
fin->fin_data[1] = icmp->icmp_id;
}
frpr_short(fin, minicmpsz);
}
/* ------------------------------------------------------------------------ */
/* Function: frpr_tcpcommon */
/* Returns: void */
/* Parameters: fin(I) - pointer to packet information */
/* */
/* TCP header sanity checking. Look for bad combinations of TCP flags, */
/* and make some checks with how they interact with other fields. */
/* If compiled with IPFILTER_CKSUM, check to see if the TCP checksum is */
/* valid and mark the packet as bad if not. */
/* ------------------------------------------------------------------------ */
static INLINE void frpr_tcpcommon(fin)
fr_info_t *fin;
{
int flags, tlen;
tcphdr_t *tcp;
fr_ip_t *fi;
fi = &fin->fin_fi;
fi->fi_flx |= FI_TCPUDP;
if (fin->fin_off != 0)
return;
if (frpr_pullup(fin, sizeof(*tcp)) == -1)
return;
tcp = fin->fin_dp;
if (fin->fin_dlen > 3) {
fin->fin_sport = ntohs(tcp->th_sport);
fin->fin_dport = ntohs(tcp->th_dport);
}
if ((fi->fi_flx & FI_SHORT) != 0)
return;
/*
* Use of the TCP data offset *must* result in a value that is at
* least the same size as the TCP header.
*/
tlen = TCP_OFF(tcp) << 2;
if (tlen < sizeof(tcphdr_t)) {
fin->fin_flx |= FI_BAD;
return;
}
flags = tcp->th_flags;
fin->fin_tcpf = tcp->th_flags;
/*
* If the urgent flag is set, then the urgent pointer must
* also be set and vice versa. Good TCP packets do not have
* just one of these set.
*/
if ((flags & TH_URG) != 0 && (tcp->th_urp == 0)) {
fin->fin_flx |= FI_BAD;
} else if ((flags & TH_URG) == 0 && (tcp->th_urp != 0)) {
/* Ignore this case, it shows up in "real" traffic with */
/* bogus values in the urgent pointer field. */
;
} else if (((flags & (TH_SYN|TH_FIN)) != 0) &&
((flags & (TH_RST|TH_ACK)) == TH_RST)) {
/* TH_FIN|TH_RST|TH_ACK seems to appear "naturally" */
fin->fin_flx |= FI_BAD;
} else if (!(flags & TH_ACK)) {
/*
* If the ack bit isn't set, then either the SYN or
* RST bit must be set. If the SYN bit is set, then
* we expect the ACK field to be 0. If the ACK is
* not set and if URG, PSH or FIN are set, consdier
* that to indicate a bad TCP packet.
*/
if ((flags == TH_SYN) && (tcp->th_ack != 0)) {
/*
* Cisco PIX sets the ACK field to a random value.
* In light of this, do not set FI_BAD until a patch
* is available from Cisco to ensure that
* interoperability between existing systems is
* achieved.
*/
/*fin->fin_flx |= FI_BAD*/;
} else if (!(flags & (TH_RST|TH_SYN))) {
fin->fin_flx |= FI_BAD;
} else if ((flags & (TH_URG|TH_PUSH|TH_FIN)) != 0) {
fin->fin_flx |= FI_BAD;
}
}
/*
* At this point, it's not exactly clear what is to be gained by
* marking up which TCP options are and are not present. The one we
* are most interested in is the TCP window scale. This is only in
* a SYN packet [RFC1323] so we don't need this here...?
* Now if we were to analyse the header for passive fingerprinting,
* then that might add some weight to adding this...
*/
if (tlen == sizeof(tcphdr_t))
return;
if (frpr_pullup(fin, tlen) == -1)
return;
#if 0
ip = fin->fin_ip;
s = (u_char *)(tcp + 1);
off = IP_HL(ip) << 2;
# ifdef _KERNEL
if (fin->fin_mp != NULL) {
mb_t *m = *fin->fin_mp;
if (off + tlen > M_LEN(m))
return;
}
# endif
for (tlen -= (int)sizeof(*tcp); tlen > 0; ) {
opt = *s;
if (opt == '\0')
break;
else if (opt == TCPOPT_NOP)
ol = 1;
else {
if (tlen < 2)
break;
ol = (int)*(s + 1);
if (ol < 2 || ol > tlen)
break;
}
for (i = 9, mv = 4; mv >= 0; ) {
op = ipopts + i;
if (opt == (u_char)op->ol_val) {
optmsk |= op->ol_bit;
break;
}
}
tlen -= ol;
s += ol;
}
#endif /* 0 */
}
/* ------------------------------------------------------------------------ */
/* Function: frpr_udpcommon */
/* Returns: void */
/* Parameters: fin(I) - pointer to packet information */
/* */
/* Extract the UDP source and destination ports, if present. If compiled */
/* with IPFILTER_CKSUM, check to see if the UDP checksum is valid. */
/* ------------------------------------------------------------------------ */
static INLINE void frpr_udpcommon(fin)
fr_info_t *fin;
{
udphdr_t *udp;
fr_ip_t *fi;
fi = &fin->fin_fi;
fi->fi_flx |= FI_TCPUDP;
udp = fin->fin_dp;
if (!fin->fin_off && (fin->fin_dlen > 3)) {
fin->fin_sport = ntohs(udp->uh_sport);
fin->fin_dport = ntohs(udp->uh_dport);
}
}
/* ------------------------------------------------------------------------ */
/* Function: frpr_tcp */
/* Returns: void */
/* Parameters: fin(I) - pointer to packet information */
/* */
/* IPv4 Only */
/* Analyse the packet for IPv4/TCP properties. */
/* ------------------------------------------------------------------------ */
static INLINE void frpr_tcp(fin)
fr_info_t *fin;
{
fr_checkv4sum(fin);
frpr_short(fin, sizeof(tcphdr_t));
frpr_tcpcommon(fin);
}
/* ------------------------------------------------------------------------ */
/* Function: frpr_udp */
/* Returns: void */
/* Parameters: fin(I) - pointer to packet information */
/* */
/* IPv4 Only */
/* Analyse the packet for IPv4/UDP properties. */
/* ------------------------------------------------------------------------ */
static INLINE void frpr_udp(fin)
fr_info_t *fin;
{
fr_checkv4sum(fin);
frpr_short(fin, sizeof(udphdr_t));
frpr_udpcommon(fin);
}
/* ------------------------------------------------------------------------ */
/* Function: frpr_esp */
/* Returns: void */
/* Parameters: fin(I) - pointer to packet information */
/* */
/* Analyse the packet for ESP properties. */
/* The minimum length is taken to be the SPI (32bits) plus a tail (32bits) */
/* even though the newer ESP packets must also have a sequence number that */
/* is 32bits as well, it is not possible(?) to determine the version from a */
/* simple packet header. */
/* ------------------------------------------------------------------------ */
static INLINE void frpr_esp(fin)
fr_info_t *fin;
{
if (frpr_pullup(fin, 8) == -1)
return;
if (fin->fin_v == 4)
frpr_short(fin, 8);
#ifdef USE_INET6
else if (fin->fin_v == 6)
frpr_short6(fin, sizeof(grehdr_t));
#endif
}
/* ------------------------------------------------------------------------ */
/* Function: frpr_gre */
/* Returns: void */
/* Parameters: fin(I) - pointer to packet information */
/* */
/* Analyse the packet for GRE properties. */
/* ------------------------------------------------------------------------ */
static INLINE void frpr_gre(fin)
fr_info_t *fin;
{
if (frpr_pullup(fin, sizeof(grehdr_t)) == -1)
return;
if (fin->fin_v == 4)
frpr_short(fin, sizeof(grehdr_t));
#ifdef USE_INET6
else if (fin->fin_v == 6)
frpr_short6(fin, sizeof(grehdr_t));
#endif
}
/* ------------------------------------------------------------------------ */
/* Function: frpr_ipv4hdr */
/* Returns: void */
/* Parameters: fin(I) - pointer to packet information */
/* */
/* IPv4 Only */
/* Analyze the IPv4 header and set fields in the fr_info_t structure. */
/* Check all options present and flag their presence if any exist. */
/* ------------------------------------------------------------------------ */
static INLINE void frpr_ipv4hdr(fin)
fr_info_t *fin;
{
u_short optmsk = 0, secmsk = 0, auth = 0;
int hlen, ol, mv, p, i;
const struct optlist *op;
u_char *s, opt;
u_short off;
fr_ip_t *fi;
ip_t *ip;
fi = &fin->fin_fi;
hlen = fin->fin_hlen;
ip = fin->fin_ip;
p = ip->ip_p;
fi->fi_p = p;
fi->fi_tos = ip->ip_tos;
fin->fin_id = ip->ip_id;
off = ip->ip_off;
/* Get both TTL and protocol */
fi->fi_p = ip->ip_p;
fi->fi_ttl = ip->ip_ttl;
#if 0
(*(((u_short *)fi) + 1)) = (*(((u_short *)ip) + 4));
#endif
/* Zero out bits not used in IPv6 address */
fi->fi_src.i6[1] = 0;
fi->fi_src.i6[2] = 0;
fi->fi_src.i6[3] = 0;
fi->fi_dst.i6[1] = 0;
fi->fi_dst.i6[2] = 0;
fi->fi_dst.i6[3] = 0;
fi->fi_saddr = ip->ip_src.s_addr;
fi->fi_daddr = ip->ip_dst.s_addr;
/*
* set packet attribute flags based on the offset and
* calculate the byte offset that it represents.
*/
if ((off & IP_MF) != 0) {
fi->fi_flx |= FI_FRAG;
if (fin->fin_dlen == 0)
fi->fi_flx |= FI_BAD;
}
off &= IP_MF|IP_OFFMASK;
if (off != 0) {
fi->fi_flx |= FI_FRAG;
off &= IP_OFFMASK;
if (off != 0) {
fin->fin_flx |= FI_FRAGBODY;
off <<= 3;
if (off + fin->fin_dlen > 0xffff) {
fi->fi_flx |= FI_BAD;
}
}
}
fin->fin_off = off;
/*
* Call per-protocol setup and checking
*/
switch (p)
{
case IPPROTO_UDP :
frpr_udp(fin);
break;
case IPPROTO_TCP :
frpr_tcp(fin);
break;
case IPPROTO_ICMP :
frpr_icmp(fin);
break;
case IPPROTO_ESP :
frpr_esp(fin);
break;
case IPPROTO_GRE :
frpr_gre(fin);
break;
}
ip = fin->fin_ip;
if (ip == NULL)
return;
/*
* If it is a standard IP header (no options), set the flag fields
* which relate to options to 0.
*/
if (hlen == sizeof(*ip)) {
fi->fi_optmsk = 0;
fi->fi_secmsk = 0;
fi->fi_auth = 0;
return;
}
/*
* So the IP header has some IP options attached. Walk the entire
* list of options present with this packet and set flags to indicate
* which ones are here and which ones are not. For the somewhat out
* of date and obscure security classification options, set a flag to
* represent which classification is present.
*/
fi->fi_flx |= FI_OPTIONS;
for (s = (u_char *)(ip + 1), hlen -= (int)sizeof(*ip); hlen > 0; ) {
opt = *s;
if (opt == '\0')
break;
else if (opt == IPOPT_NOP)
ol = 1;
else {
if (hlen < 2)
break;
ol = (int)*(s + 1);
if (ol < 2 || ol > hlen)
break;
}
for (i = 9, mv = 4; mv >= 0; ) {
op = ipopts + i;
if ((opt == (u_char)op->ol_val) && (ol > 4)) {
optmsk |= op->ol_bit;
if (opt == IPOPT_SECURITY) {
const struct optlist *sp;
u_char sec;
int j, m;
sec = *(s + 2); /* classification */
for (j = 3, m = 2; m >= 0; ) {
sp = secopt + j;
if (sec == sp->ol_val) {
secmsk |= sp->ol_bit;
auth = *(s + 3);
auth *= 256;
auth += *(s + 4);
break;
}
if (sec < sp->ol_val)
j -= m;
else
j += m;
m--;
}
}
break;
}
if (opt < op->ol_val)
i -= mv;
else
i += mv;
mv--;
}
hlen -= ol;
s += ol;
}
/*
*
*/
if (auth && !(auth & 0x0100))
auth &= 0xff00;
fi->fi_optmsk = optmsk;
fi->fi_secmsk = secmsk;
fi->fi_auth = auth;
}
/* ------------------------------------------------------------------------ */
/* Function: fr_makefrip */
/* Returns: void */
/* Parameters: hlen(I) - length of IP packet header */
/* ip(I) - pointer to the IP header */
/* fin(IO) - pointer to packet information */
/* */
/* Compact the IP header into a structure which contains just the info. */
/* which is useful for comparing IP headers with and store this information */
/* in the fr_info_t structure pointer to by fin. At present, it is assumed */
/* this function will be called with either an IPv4 or IPv6 packet. */
/* ------------------------------------------------------------------------ */
int fr_makefrip(hlen, ip, fin)
int hlen;
ip_t *ip;
fr_info_t *fin;
{
int v;
fin->fin_nat = NULL;
fin->fin_state = NULL;
fin->fin_depth = 0;
fin->fin_hlen = (u_short)hlen;
fin->fin_ip = ip;
fin->fin_rule = 0xffffffff;
fin->fin_group[0] = -1;
fin->fin_group[1] = '\0';
fin->fin_dlen = fin->fin_plen - hlen;
fin->fin_dp = (char *)ip + hlen;
v = fin->fin_v;
if (v == 4)
frpr_ipv4hdr(fin);
#ifdef USE_INET6
else if (v == 6)
frpr_ipv6hdr(fin);
#endif
if (fin->fin_ip == NULL)
return -1;
return 0;
}
/* ------------------------------------------------------------------------ */
/* Function: fr_portcheck */
/* Returns: int - 1 == port matched, 0 == port match failed */
/* Parameters: frp(I) - pointer to port check `expression' */
/* pop(I) - pointer to port number to evaluate */
/* */
/* Perform a comparison of a port number against some other(s), using a */
/* structure with compare information stored in it. */
/* ------------------------------------------------------------------------ */
static INLINE int fr_portcheck(frp, pop)
frpcmp_t *frp;
u_short *pop;
{
u_short tup, po;
int err = 1;
tup = *pop;
po = frp->frp_port;
/*
* Do opposite test to that required and continue if that succeeds.
*/
switch (frp->frp_cmp)
{
case FR_EQUAL :
if (tup != po) /* EQUAL */
err = 0;
break;
case FR_NEQUAL :
if (tup == po) /* NOTEQUAL */
err = 0;
break;
case FR_LESST :
if (tup >= po) /* LESSTHAN */
err = 0;
break;
case FR_GREATERT :
if (tup <= po) /* GREATERTHAN */
err = 0;
break;
case FR_LESSTE :
if (tup > po) /* LT or EQ */
err = 0;
break;
case FR_GREATERTE :
if (tup < po) /* GT or EQ */
err = 0;
break;
case FR_OUTRANGE :
if (tup >= po && tup <= frp->frp_top) /* Out of range */
err = 0;
break;
case FR_INRANGE :
if (tup <= po || tup >= frp->frp_top) /* In range */
err = 0;
break;
case FR_INCRANGE :
if (tup < po || tup > frp->frp_top) /* Inclusive range */
err = 0;
break;
default :
break;
}
return err;
}
/* ------------------------------------------------------------------------ */
/* Function: fr_tcpudpchk */
/* Returns: int - 1 == protocol matched, 0 == check failed */
/* Parameters: fin(I) - pointer to packet information */
/* ft(I) - pointer to structure with comparison data */
/* */
/* Compares the current pcket (assuming it is TCP/UDP) information with a */
/* structure containing information that we want to match against. */
/* ------------------------------------------------------------------------ */
int fr_tcpudpchk(fin, ft)
fr_info_t *fin;
frtuc_t *ft;
{
int err = 1;
/*
* Both ports should *always* be in the first fragment.
* So far, I cannot find any cases where they can not be.
*
* compare destination ports
*/
if (ft->ftu_dcmp)
err = fr_portcheck(&ft->ftu_dst, &fin->fin_dport);
/*
* compare source ports
*/
if (err && ft->ftu_scmp)
err = fr_portcheck(&ft->ftu_src, &fin->fin_sport);
/*
* If we don't have all the TCP/UDP header, then how can we
* expect to do any sort of match on it ? If we were looking for
* TCP flags, then NO match. If not, then match (which should
* satisfy the "short" class too).
*/
if (err && (fin->fin_p == IPPROTO_TCP)) {
if (fin->fin_flx & FI_SHORT)
return !(ft->ftu_tcpf | ft->ftu_tcpfm);
/*
* Match the flags ? If not, abort this match.
*/
if (ft->ftu_tcpfm &&
ft->ftu_tcpf != (fin->fin_tcpf & ft->ftu_tcpfm)) {
FR_DEBUG(("f. %#x & %#x != %#x\n", fin->fin_tcpf,
ft->ftu_tcpfm, ft->ftu_tcpf));
err = 0;
}
}
return err;
}
/* ------------------------------------------------------------------------ */
/* Function: fr_ipfcheck */
/* Returns: int - 0 == match, 1 == no match */
/* Parameters: fin(I) - pointer to packet information */
/* fr(I) - pointer to filter rule */
/* portcmp(I) - flag indicating whether to attempt matching on */
/* TCP/UDP port data. */
/* */
/* Check to see if a packet matches an IPFilter rule. Checks of addresses, */
/* port numbers, etc, for "standard" IPFilter rules are all orchestrated in */
/* this function. */
/* ------------------------------------------------------------------------ */
static INLINE int fr_ipfcheck(fin, fr, portcmp)
fr_info_t *fin;
frentry_t *fr;
int portcmp;
{
u_32_t *ld, *lm, *lip;
fripf_t *fri;
fr_ip_t *fi;
int i;
fi = &fin->fin_fi;
fri = fr->fr_ipf;
lip = (u_32_t *)fi;
lm = (u_32_t *)&fri->fri_mip;
ld = (u_32_t *)&fri->fri_ip;
/*
* first 32 bits to check coversion:
* IP version, TOS, TTL, protocol
*/
i = ((*lip & *lm) != *ld);
FR_DEBUG(("0. %#08x & %#08x != %#08x\n",
*lip, *lm, *ld));
if (i)
return 1;
/*
* Next 32 bits is a constructed bitmask indicating which IP options
* are present (if any) in this packet.
*/
lip++, lm++, ld++;
i |= ((*lip & *lm) != *ld);
FR_DEBUG(("1. %#08x & %#08x != %#08x\n",
*lip, *lm, *ld));
if (i)
return 1;
lip++, lm++, ld++;
/*
* Unrolled loops (4 each, for 32 bits) for address checks.
*/
/*
* Check the source address.
*/
#ifdef IPFILTER_LOOKUP
if (fr->fr_satype == FRI_LOOKUP) {
i = (*fr->fr_srcfunc)(fr->fr_srcptr, fi->fi_v, lip);
if (i == -1)
return 1;
lip += 3;
lm += 3;
ld += 3;
} else {
#endif
i = ((*lip & *lm) != *ld);
FR_DEBUG(("2a. %#08x & %#08x != %#08x\n",
*lip, *lm, *ld));
if (fi->fi_v == 6) {
lip++, lm++, ld++;
i |= ((*lip & *lm) != *ld);
FR_DEBUG(("2b. %#08x & %#08x != %#08x\n",
*lip, *lm, *ld));
lip++, lm++, ld++;
i |= ((*lip & *lm) != *ld);
FR_DEBUG(("2c. %#08x & %#08x != %#08x\n",
*lip, *lm, *ld));
lip++, lm++, ld++;
i |= ((*lip & *lm) != *ld);
FR_DEBUG(("2d. %#08x & %#08x != %#08x\n",
*lip, *lm, *ld));
} else {
lip += 3;
lm += 3;
ld += 3;
}
#ifdef IPFILTER_LOOKUP
}
#endif
i ^= (fr->fr_flags & FR_NOTSRCIP) >> 6;
if (i)
return 1;
/*
* Check the destination address.
*/
lip++, lm++, ld++;
#ifdef IPFILTER_LOOKUP
if (fr->fr_datype == FRI_LOOKUP) {
i = (*fr->fr_dstfunc)(fr->fr_dstptr, fi->fi_v, lip);
if (i == -1)
return 1;
lip += 3;
lm += 3;
ld += 3;
} else {
#endif
i = ((*lip & *lm) != *ld);
FR_DEBUG(("3a. %#08x & %#08x != %#08x\n",
*lip, *lm, *ld));
if (fi->fi_v == 6) {
lip++, lm++, ld++;
i |= ((*lip & *lm) != *ld);
FR_DEBUG(("3b. %#08x & %#08x != %#08x\n",
*lip, *lm, *ld));
lip++, lm++, ld++;
i |= ((*lip & *lm) != *ld);
FR_DEBUG(("3c. %#08x & %#08x != %#08x\n",
*lip, *lm, *ld));
lip++, lm++, ld++;
i |= ((*lip & *lm) != *ld);
FR_DEBUG(("3d. %#08x & %#08x != %#08x\n",
*lip, *lm, *ld));
} else {
lip += 3;
lm += 3;
ld += 3;
}
#ifdef IPFILTER_LOOKUP
}
#endif
i ^= (fr->fr_flags & FR_NOTDSTIP) >> 7;
if (i)
return 1;
/*
* IP addresses matched. The next 32bits contains:
* mast of old IP header security & authentication bits.
*/
lip++, lm++, ld++;
i |= ((*lip & *lm) != *ld);
FR_DEBUG(("4. %#08x & %#08x != %#08x\n",
*lip, *lm, *ld));
/*
* Next we have 32 bits of packet flags.
*/
lip++, lm++, ld++;
i |= ((*lip & *lm) != *ld);
FR_DEBUG(("5. %#08x & %#08x != %#08x\n",
*lip, *lm, *ld));
if (i == 0) {
/*
* If a fragment, then only the first has what we're
* looking for here...
*/
if (portcmp) {
if (!fr_tcpudpchk(fin, &fr->fr_tuc))
i = 1;
} else {
if (fr->fr_dcmp || fr->fr_scmp ||
fr->fr_tcpf || fr->fr_tcpfm)
i = 1;
if (fr->fr_icmpm || fr->fr_icmp) {
if (((fi->fi_p != IPPROTO_ICMP) &&
(fi->fi_p != IPPROTO_ICMPV6)) ||
fin->fin_off || (fin->fin_dlen < 2))
i = 1;
else if ((fin->fin_data[0] & fr->fr_icmpm) !=
fr->fr_icmp) {
FR_DEBUG(("i. %#x & %#x != %#x\n",
fin->fin_data[0],
fr->fr_icmpm, fr->fr_icmp));
i = 1;
}
}
}
}
return i;
}
/* ------------------------------------------------------------------------ */
/* Function: fr_scanlist */
/* Returns: int - result flags of scanning filter list */
/* Parameters: fin(I) - pointer to packet information */
/* pass(I) - default result to return for filtering */
/* */
/* Check the input/output list of rules for a match to the current packet. */
/* If a match is found, the value of fr_flags from the rule becomes the */
/* return value and fin->fin_fr points to the matched rule. */
/* */
/* This function may be called recusively upto 16 times (limit inbuilt.) */
/* When unwinding, it should finish up with fin_depth as 0. */
/* */
/* Could be per interface, but this gets real nasty when you don't have, */
/* or can't easily change, the kernel source code to . */
/* ------------------------------------------------------------------------ */
int fr_scanlist(fin, pass)
fr_info_t *fin;
u_32_t pass;
{
int rulen, portcmp, off, logged, skip;
struct frentry *fr, *fnext;
u_32_t passt;
/*
* Do not allow nesting deeper than 16 levels.
*/
if (fin->fin_depth >= 16)
return pass;
fr = fin->fin_fr;
/*
* If there are no rules in this list, return now.
*/
if (fr == NULL)
return pass;
skip = 0;
logged = 0;
portcmp = 0;
fin->fin_depth++;
fin->fin_fr = NULL;
off = fin->fin_off;
if ((fin->fin_flx & FI_TCPUDP) && (fin->fin_dlen > 3) && !off)
portcmp = 1;
for (rulen = 0; fr; fr = fnext, rulen++) {
fnext = fr->fr_next;
if (skip != 0) {
FR_VERBOSE(("%d (%#x)\n", skip, fr->fr_flags));
skip--;
continue;
}
/*
* In all checks below, a null (zero) value in the
* filter struture is taken to mean a wildcard.
*
* check that we are working for the right interface
*/
#ifdef _KERNEL
if (fr->fr_ifa && fr->fr_ifa != fin->fin_ifp)
continue;
#else
if (opts & (OPT_VERBOSE|OPT_DEBUG))
printf("\n");
FR_VERBOSE(("%c", FR_ISSKIP(pass) ? 's' :
FR_ISPASS(pass) ? 'p' :
FR_ISACCOUNT(pass) ? 'A' :
FR_ISAUTH(pass) ? 'a' :
(pass & FR_NOMATCH) ? 'n' :'b'));
if (fr->fr_ifa && fr->fr_ifa != fin->fin_ifp)
continue;
FR_VERBOSE((":i"));
#endif
switch (fr->fr_type)
{
case FR_T_IPF :
case FR_T_IPF|FR_T_BUILTIN :
if (fr_ipfcheck(fin, fr, portcmp))
continue;
break;
#if defined(IPFILTER_BPF)
case FR_T_BPFOPC :
case FR_T_BPFOPC|FR_T_BUILTIN :
{
u_char *mc;
int wlen;
if (*fin->fin_mp == NULL)
continue;
if (fin->fin_v != fr->fr_v)
continue;
mc = (u_char *)fin->fin_m;
wlen = fin->fin_dlen + fin->fin_hlen;
if (!bpf_filter(fr->fr_data, mc, wlen, 0))
continue;
break;
}
#endif
case FR_T_CALLFUNC|FR_T_BUILTIN :
{
frentry_t *f;
f = (*fr->fr_func)(fin, &pass);
if (f != NULL)
fr = f;
else
continue;
break;
}
default :
break;
}
if ((fin->fin_out == 0) && (fr->fr_nattag.ipt_num[0] != 0)) {
if (fin->fin_nattag == NULL)
continue;
if (fr_matchtag(&fr->fr_nattag, fin->fin_nattag) == 0)
continue;
}
FR_VERBOSE(("=%s.%d *", fr->fr_group, rulen));
passt = fr->fr_flags;
/*
* Allowing a rule with the "keep state" flag set to match
* packets that have been tagged "out of window" by the TCP
* state tracking is foolish as the attempt to add a new
* state entry to the table will fail.
*/
if ((passt & FR_KEEPSTATE) && (fin->fin_flx & FI_OOW))
continue;
/*
* If the rule is a "call now" rule, then call the function
* in the rule, if it exists and use the results from that.
* If the function pointer is bad, just make like we ignore
* it, except for increasing the hit counter.
*/
if ((passt & FR_CALLNOW) != 0) {
ATOMIC_INC64(fr->fr_hits);
if ((fr->fr_func != NULL) &&
(fr->fr_func != (ipfunc_t)-1)) {
frentry_t *frs;
frs = fin->fin_fr;
fin->fin_fr = fr;
fr = (*fr->fr_func)(fin, &passt);
if (fr == NULL) {
fin->fin_fr = frs;
continue;
}
passt = fr->fr_flags;
fin->fin_fr = fr;
}
} else {
fin->fin_fr = fr;
}
#ifdef IPFILTER_LOG
/*
* Just log this packet...
*/
if ((passt & FR_LOGMASK) == FR_LOG) {
if (ipflog(fin, passt) == -1) {
if (passt & FR_LOGORBLOCK) {
passt &= ~FR_CMDMASK;
passt |= FR_BLOCK|FR_QUICK;
}
ATOMIC_INCL(frstats[fin->fin_out].fr_skip);
}
ATOMIC_INCL(frstats[fin->fin_out].fr_pkl);
logged = 1;
}
#endif /* IPFILTER_LOG */
fr->fr_bytes += (U_QUAD_T)fin->fin_plen;
if (FR_ISSKIP(passt))
skip = fr->fr_arg;
else if ((passt & FR_LOGMASK) != FR_LOG)
pass = passt;
if (passt & (FR_RETICMP|FR_FAKEICMP))
fin->fin_icode = fr->fr_icode;
FR_DEBUG(("pass %#x\n", pass));
ATOMIC_INC64(fr->fr_hits);
fin->fin_rule = rulen;
(void) strncpy(fin->fin_group, fr->fr_group, FR_GROUPLEN);
if (fr->fr_grp != NULL) {
fin->fin_fr = *fr->fr_grp;
pass = fr_scanlist(fin, pass);
if (fin->fin_fr == NULL) {
fin->fin_rule = rulen;
(void) strncpy(fin->fin_group, fr->fr_group,
FR_GROUPLEN);
fin->fin_fr = fr;
}
if (fin->fin_flx & FI_DONTCACHE)
logged = 1;
}
if (pass & FR_QUICK)
break;
}
if (logged)
fin->fin_flx |= FI_DONTCACHE;
fin->fin_depth--;
return pass;
}
/* ------------------------------------------------------------------------ */
/* Function: fr_acctpkt */
/* Returns: frentry_t* - always returns NULL */
/* Parameters: fin(I) - pointer to packet information */
/* passp(IO) - pointer to current/new filter decision (unused) */
/* */
/* Checks a packet against accounting rules, if there are any for the given */
/* IP protocol version. */
/* */
/* N.B.: this function returns NULL to match the prototype used by other */
/* functions called from the IPFilter "mainline" in fr_check(). */
/* ------------------------------------------------------------------------ */
frentry_t *fr_acctpkt(fin, passp)
fr_info_t *fin;
u_32_t *passp;
{
char group[FR_GROUPLEN];
frentry_t *fr, *frsave;
u_32_t pass, rulen;
passp = passp;
#ifdef USE_INET6
if (fin->fin_v == 6)
fr = ipacct6[fin->fin_out][fr_active];
else
#endif
fr = ipacct[fin->fin_out][fr_active];
if (fr != NULL) {
frsave = fin->fin_fr;
bcopy(fin->fin_group, group, FR_GROUPLEN);
rulen = fin->fin_rule;
fin->fin_fr = fr;
pass = fr_scanlist(fin, FR_NOMATCH);
if (FR_ISACCOUNT(pass)) {
ATOMIC_INCL(frstats[0].fr_acct);
}
fin->fin_fr = frsave;
bcopy(group, fin->fin_group, FR_GROUPLEN);
fin->fin_rule = rulen;
}
return NULL;
}
/* ------------------------------------------------------------------------ */
/* Function: fr_firewall */
/* Returns: frentry_t* - returns pointer to matched rule, if no matches */
/* were found, returns NULL. */
/* Parameters: fin(I) - pointer to packet information */
/* passp(IO) - pointer to current/new filter decision (unused) */
/* */
/* Applies an appropriate set of firewall rules to the packet, to see if */
/* there are any matches. The first check is to see if a match can be seen */
/* in the cache. If not, then search an appropriate list of rules. Once a */
/* matching rule is found, take any appropriate actions as defined by the */
/* rule - except logging. */
/* ------------------------------------------------------------------------ */
static frentry_t *fr_firewall(fin, passp)
fr_info_t *fin;
u_32_t *passp;
{
frentry_t *fr;
fr_info_t *fc;
u_32_t pass;
int out;
out = fin->fin_out;
pass = *passp;
/*
* If a packet is found in the auth table, then skip checking
* the access lists for permission but we do need to consider
* the result as if it were from the ACL's.
*/
fc = &frcache[out][CACHE_HASH(fin)];
if (!bcmp((char *)fin, (char *)fc, FI_CSIZE)) {
/*
* copy cached data so we can unlock the mutex
* earlier.
*/
bcopy((char *)fc, (char *)fin, FI_COPYSIZE);
ATOMIC_INCL(frstats[out].fr_chit);
if ((fr = fin->fin_fr) != NULL) {
ATOMIC_INC64(fr->fr_hits);
pass = fr->fr_flags;
}
} else {
#ifdef USE_INET6
if (fin->fin_v == 6)
fin->fin_fr = ipfilter6[out][fr_active];
else
#endif
fin->fin_fr = ipfilter[out][fr_active];
if (fin->fin_fr != NULL)
pass = fr_scanlist(fin, fr_pass);
if (((pass & FR_KEEPSTATE) == 0) &&
((fin->fin_flx & FI_DONTCACHE) == 0))
bcopy((char *)fin, (char *)fc, FI_COPYSIZE);
if ((pass & FR_NOMATCH)) {
ATOMIC_INCL(frstats[out].fr_nom);
}
fr = fin->fin_fr;
}
/*
* Apply packets per second rate-limiting to a rule as required.
*/
if ((fr != NULL) && (fr->fr_pps != 0) &&
!ppsratecheck(&fr->fr_lastpkt, &fr->fr_curpps, fr->fr_pps)) {
pass &= ~(FR_CMDMASK|FR_DUP|FR_RETICMP|FR_RETRST);
pass |= FR_BLOCK;
ATOMIC_INCL(frstats[out].fr_ppshit);
}
/*
* If we fail to add a packet to the authorization queue, then we
* drop the packet later. However, if it was added then pretend
* we've dropped it already.
*/
if (FR_ISAUTH(pass)) {
if (fr_newauth(fin->fin_m, fin) != 0) {
#ifdef _KERNEL
fin->fin_m = *fin->fin_mp = NULL;
#else
;
#endif
fin->fin_error = 0;
} else
fin->fin_error = ENOSPC;
}
if ((fr != NULL) && (fr->fr_func != NULL) &&
(fr->fr_func != (ipfunc_t)-1) && !(pass & FR_CALLNOW))
(void) (*fr->fr_func)(fin, &pass);
/*
* If a rule is a pre-auth rule, check again in the list of rules
* loaded for authenticated use. It does not particulary matter
* if this search fails because a "preauth" result, from a rule,
* is treated as "not a pass", hence the packet is blocked.
*/
if (FR_ISPREAUTH(pass)) {
if ((fin->fin_fr = ipauth) != NULL)
pass = fr_scanlist(fin, fr_pass);
}
/*
* If the rule has "keep frag" and the packet is actually a fragment,
* then create a fragment state entry.
*/
if ((pass & (FR_KEEPFRAG|FR_KEEPSTATE)) == FR_KEEPFRAG) {
if (fin->fin_flx & FI_FRAG) {
if (fr_newfrag(fin, pass) == -1) {
ATOMIC_INCL(frstats[out].fr_bnfr);
} else {
ATOMIC_INCL(frstats[out].fr_nfr);
}
} else {
ATOMIC_INCL(frstats[out].fr_cfr);
}
}
/*
* Finally, if we've asked to track state for this packet, set it up.
*/
if ((pass & FR_KEEPSTATE) && !(fin->fin_flx & FI_STATE)) {
if (fr_addstate(fin, NULL, 0) != NULL) {
ATOMIC_INCL(frstats[out].fr_ads);
} else {
ATOMIC_INCL(frstats[out].fr_bads);
if (FR_ISPASS(pass)) {
pass &= ~FR_CMDMASK;
pass |= FR_BLOCK;
}
}
}
fr = fin->fin_fr;
if (passp != NULL)
*passp = pass;
return fr;
}
/* ------------------------------------------------------------------------ */
/* Function: fr_check */
/* Returns: int - 0 == packet allowed through, */
/* User space: */
/* -1 == packet blocked */
/* 1 == packet not matched */
/* -2 == requires authantication */
/* Kernel: */
/* > 0 == filter error # for packet */
/* Parameters: ip(I) - pointer to start of IPv4/6 packet */
/* hlen(I) - length of header */
/* ifp(I) - pointer to interface this packet is on */
/* out(I) - 0 == packet going in, 1 == packet going out */
/* mp(IO) - pointer to caller's buffer pointer that holds this */
/* IP packet. */
/* Solaris & HP-UX ONLY : */
/* qpi(I) - pointer to STREAMS queue information for this */
/* interface & direction. */
/* */
/* fr_check() is the master function for all IPFilter packet processing. */
/* It orchestrates: Network Address Translation (NAT), checking for packet */
/* authorisation (or pre-authorisation), presence of related state info., */
/* generating log entries, IP packet accounting, routing of packets as */
/* directed by firewall rules and of course whether or not to allow the */
/* packet to be further processed by the kernel. */
/* */
/* For packets blocked, the contents of "mp" will be NULL'd and the buffer */
/* freed. Packets passed may be returned with the pointer pointed to by */
/* by "mp" changed to a new buffer. */
/* ------------------------------------------------------------------------ */
int fr_check(ip, hlen, ifp, out
#if defined(_KERNEL) && defined(MENTAT)
, qif, mp)
void *qif;
#else
, mp)
#endif
mb_t **mp;
ip_t *ip;
int hlen;
void *ifp;
int out;
{
/*
* The above really sucks, but short of writing a diff
*/
fr_info_t frinfo;
fr_info_t *fin = &frinfo;
u_32_t pass = fr_pass;
frentry_t *fr = NULL;
int v = IP_V(ip);
mb_t *mc = NULL;
mb_t *m;
#ifdef USE_INET6
ip6_t *ip6;
#endif
/*
* The first part of fr_check() deals with making sure that what goes
* into the filtering engine makes some sense. Information about the
* the packet is distilled, collected into a fr_info_t structure and
* the an attempt to ensure the buffer the packet is in is big enough
* to hold all the required packet headers.
*/
#ifdef _KERNEL
# ifdef MENTAT
qpktinfo_t *qpi = qif;
if ((u_int)ip & 0x3)
return 2;
# endif
READ_ENTER(&ipf_global);
if (fr_running <= 0) {
RWLOCK_EXIT(&ipf_global);
return 0;
}
bzero((char *)fin, sizeof(*fin));
# ifdef MENTAT
if (qpi->qpi_flags & QF_GROUP)
fin->fin_flx |= FI_MBCAST;
m = qpi->qpi_m;
fin->fin_qfm = m;
fin->fin_qpi = qpi;
# else /* MENTAT */
m = *mp;
# if defined(M_MCAST)
if ((m->m_flags & M_MCAST) != 0)
fin->fin_flx |= FI_MBCAST|FI_MULTICAST;
# endif
# if defined(M_BCAST)
if ((m->m_flags & M_BCAST) != 0)
fin->fin_flx |= FI_MBCAST|FI_BROADCAST;
# endif
# ifdef M_CANFASTFWD
/*
* XXX For now, IP Filter and fast-forwarding of cached flows
* XXX are mutually exclusive. Eventually, IP Filter should
* XXX get a "can-fast-forward" filter rule.
*/
m->m_flags &= ~M_CANFASTFWD;
# endif /* M_CANFASTFWD */
# ifdef CSUM_DELAY_DATA
/*
* disable delayed checksums.
*/
if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
in_delayed_cksum(m);
m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
}
# endif /* CSUM_DELAY_DATA */
# endif /* MENTAT */
#else
READ_ENTER(&ipf_global);
bzero((char *)fin, sizeof(*fin));
m = *mp;
#endif /* _KERNEL */
fin->fin_v = v;
fin->fin_m = m;
fin->fin_ip = ip;
fin->fin_mp = mp;
fin->fin_out = out;
fin->fin_ifp = ifp;
fin->fin_error = ENETUNREACH;
fin->fin_hlen = (u_short )hlen;
fin->fin_dp = (char *)ip + hlen;
fin->fin_ipoff = (char *)ip - MTOD(m, char *);
#ifdef USE_INET6
if (v == 6) {
ATOMIC_INCL(frstats[out].fr_ipv6);
/*
* Jumbo grams are quite likely too big for internal buffer
* structures to handle comfortably, for now, so just drop
* them.
*/
ip6 = (ip6_t *)ip;
fin->fin_plen = ntohs(ip6->ip6_plen);
if (fin->fin_plen == 0) {
pass = FR_BLOCK|FR_NOMATCH;
goto filtered;
}
fin->fin_plen += sizeof(ip6_t);
} else
#endif
{
#if (OpenBSD >= 200311) && defined(_KERNEL)
ip->ip_len = ntohs(ip->ip_len);
ip->ip_off = ntohs(ip->ip_off);
#endif
fin->fin_plen = ip->ip_len;
}
if (fr_makefrip(hlen, ip, fin) == -1)
goto finished;
/*
* For at least IPv6 packets, if a m_pullup() fails then this pointer
* becomes NULL and so we have no packet to free.
*/
if (*fin->fin_mp == NULL)
goto finished;
if (!out) {
if (v == 4) {
#ifdef _KERNEL
if (fr_chksrc && !fr_verifysrc(fin)) {
ATOMIC_INCL(frstats[0].fr_badsrc);
fin->fin_flx |= FI_BADSRC;
}
#endif
if (fin->fin_ip->ip_ttl < fr_minttl) {
ATOMIC_INCL(frstats[0].fr_badttl);
fin->fin_flx |= FI_LOWTTL;
}
}
#ifdef USE_INET6
else if (v == 6) {
ip6 = (ip6_t *)ip;
if (ip6->ip6_hlim < fr_minttl) {
ATOMIC_INCL(frstats[0].fr_badttl);
fin->fin_flx |= FI_LOWTTL;
}
}
#endif
}
if (fin->fin_flx & FI_SHORT) {
ATOMIC_INCL(frstats[out].fr_short);
}
READ_ENTER(&ipf_mutex);
/*
* Check auth now. This, combined with the check below to see if apass
* is 0 is to ensure that we don't count the packet twice, which can
* otherwise occur when we reprocess it. As it is, we only count it
* after it has no auth. table matchup. This also stops NAT from
* occuring until after the packet has been auth'd.
*/
fr = fr_checkauth(fin, &pass);
if (!out) {
if (fr_checknatin(fin, &pass) == -1) {
RWLOCK_EXIT(&ipf_mutex);
goto finished;
}
}
if (!out)
(void) fr_acctpkt(fin, NULL);
if (fr == NULL)
if ((fin->fin_flx & (FI_FRAG|FI_BAD)) == FI_FRAG)
fr = fr_knownfrag(fin, &pass);
if (fr == NULL)
fr = fr_checkstate(fin, &pass);
if ((pass & FR_NOMATCH) || (fr == NULL))
fr = fr_firewall(fin, &pass);
fin->fin_fr = fr;
/*
* Only count/translate packets which will be passed on, out the
* interface.
*/
if (out && FR_ISPASS(pass)) {
(void) fr_acctpkt(fin, NULL);
if (fr_checknatout(fin, &pass) == -1) {
RWLOCK_EXIT(&ipf_mutex);
goto finished;
} else if ((fr_update_ipid != 0) && (v == 4)) {
if (fr_updateipid(fin) == -1) {
ATOMIC_INCL(frstats[1].fr_ipud);
pass &= ~FR_CMDMASK;
pass |= FR_BLOCK;
} else {
ATOMIC_INCL(frstats[0].fr_ipud);
}
}
}
#ifdef IPFILTER_LOG
if ((fr_flags & FF_LOGGING) || (pass & FR_LOGMASK)) {
(void) fr_dolog(fin, &pass);
}
#endif
if (fin->fin_state != NULL)
fr_statederef(fin, (ipstate_t **)&fin->fin_state);
if (fin->fin_nat != NULL)
fr_natderef((nat_t **)&fin->fin_nat);
/*
* Only allow FR_DUP to work if a rule matched - it makes no sense to
* set FR_DUP as a "default" as there are no instructions about where
* to send the packet. Use fin_m here because it may have changed
* (without an update of 'm') in prior processing.
*/
if ((fr != NULL) && (pass & FR_DUP)) {
mc = M_DUPLICATE(fin->fin_m);
}
if (pass & (FR_RETRST|FR_RETICMP)) {
/*
* Should we return an ICMP packet to indicate error
* status passing through the packet filter ?
* WARNING: ICMP error packets AND TCP RST packets should
* ONLY be sent in repsonse to incoming packets. Sending them
* in response to outbound packets can result in a panic on
* some operating systems.
*/
if (!out) {
if (pass & FR_RETICMP) {
int dst;
if ((pass & FR_RETMASK) == FR_FAKEICMP)
dst = 1;
else
dst = 0;
(void) fr_send_icmp_err(ICMP_UNREACH, fin, dst);
ATOMIC_INCL(frstats[0].fr_ret);
} else if (((pass & FR_RETMASK) == FR_RETRST) &&
!(fin->fin_flx & FI_SHORT)) {
if (fr_send_reset(fin) == 0) {
ATOMIC_INCL(frstats[1].fr_ret);
}
}
} else {
if (pass & FR_RETRST)
fin->fin_error = ECONNRESET;
}
}
/*
* If we didn't drop off the bottom of the list of rules (and thus
* the 'current' rule fr is not NULL), then we may have some extra
* instructions about what to do with a packet.
* Once we're finished return to our caller, freeing the packet if
* we are dropping it (* BSD ONLY *).
* Reassign m from fin_m as we may have a new buffer, now.
*/
#if defined(USE_INET6) || (defined(__sgi) && defined(_KERNEL))
filtered:
#endif
m = fin->fin_m;
if (FR_ISPASS(pass)) {
ATOMIC_INCL(frstats[out].fr_pass);
} else if (FR_ISBLOCK(pass)) {
ATOMIC_INCL(frstats[out].fr_block);
}
if (fr != NULL) {
frdest_t *fdp;
fdp = &fr->fr_tifs[fin->fin_rev];
if (!out && (pass & FR_FASTROUTE)) {
/*
* For fastroute rule, no destioation interface defined
* so pass NULL as the frdest_t parameter
*/
(void) fr_fastroute(m, mp, fin, NULL);
m = *mp = NULL;
} else if ((fdp->fd_ifp != NULL) &&
(fdp->fd_ifp != (struct ifnet *)-1)) {
/* this is for to rules: */
(void) fr_fastroute(m, mp, fin, fdp);
m = *mp = NULL;
}
/*
* Generate a duplicated packet.
*/
if (mc != NULL)
(void) fr_fastroute(mc, &mc, fin, &fr->fr_dif);
}
/*
* This late because the likes of fr_fastroute() use fin_fr.
*/
RWLOCK_EXIT(&ipf_mutex);
if (!FR_ISPASS(pass)) {
if (*mp != NULL) {
FREE_MB_T(*mp);
m = *mp = NULL;
}
}
#if defined(_KERNEL) && defined(__sgi)
else {
if ((fin->fin_hbuf != NULL) &&
(mtod(fin->fin_m, struct ip *) != fin->fin_ip)) {
COPYBACK(m, 0, fin->fin_plen, fin->fin_hbuf);
}
}
#endif
finished:
RWLOCK_EXIT(&ipf_global);
#ifdef _KERNEL
# if OpenBSD >= 200311
if (FR_ISPASS(pass) && (v == 4)) {
ip = fin->fin_ip;
ip->ip_len = ntohs(ip->ip_len);
ip->ip_off = ntohs(ip->ip_off);
}
# endif
return (FR_ISPASS(pass)) ? 0 : fin->fin_error;
#else /* _KERNEL */
FR_VERBOSE(("fin_flx %#x pass %#x ", fin->fin_flx, pass));
if ((pass & FR_NOMATCH) != 0)
return 1;
if ((pass & FR_RETMASK) != 0)
switch (pass & FR_RETMASK)
{
case FR_RETRST :
return 3;
case FR_RETICMP :
return 4;
case FR_FAKEICMP :
return 5;
}
switch (pass & FR_CMDMASK)
{
case FR_PASS :
return 0;
case FR_BLOCK :
return -1;
case FR_AUTH :
return -2;
case FR_ACCOUNT :
return -3;
case FR_PREAUTH :
return -4;
}
return 2;
#endif /* _KERNEL */
}
#ifdef IPFILTER_LOG
/* ------------------------------------------------------------------------ */
/* Function: fr_dolog */
/* Returns: frentry_t* - returns contents of fin_fr (no change made) */
/* Parameters: fin(I) - pointer to packet information */
/* passp(IO) - pointer to current/new filter decision (unused) */
/* */
/* Checks flags set to see how a packet should be logged, if it is to be */
/* logged. Adjust statistics based on its success or not. */
/* ------------------------------------------------------------------------ */
frentry_t *fr_dolog(fin, passp)
fr_info_t *fin;
u_32_t *passp;
{
u_32_t pass;
int out;
out = fin->fin_out;
pass = *passp;
if ((fr_flags & FF_LOGNOMATCH) && (pass & FR_NOMATCH)) {
pass |= FF_LOGNOMATCH;
ATOMIC_INCL(frstats[out].fr_npkl);
goto logit;
} else if (((pass & FR_LOGMASK) == FR_LOGP) ||
(FR_ISPASS(pass) && (fr_flags & FF_LOGPASS))) {
if ((pass & FR_LOGMASK) != FR_LOGP)
pass |= FF_LOGPASS;
ATOMIC_INCL(frstats[out].fr_ppkl);
goto logit;
} else if (((pass & FR_LOGMASK) == FR_LOGB) ||
(FR_ISBLOCK(pass) && (fr_flags & FF_LOGBLOCK))) {
if ((pass & FR_LOGMASK) != FR_LOGB)
pass |= FF_LOGBLOCK;
ATOMIC_INCL(frstats[out].fr_bpkl);
logit:
if (ipflog(fin, pass) == -1) {
ATOMIC_INCL(frstats[out].fr_skip);
/*
* If the "or-block" option has been used then
* block the packet if we failed to log it.
*/
if ((pass & FR_LOGORBLOCK) &&
FR_ISPASS(pass)) {
pass &= ~FR_CMDMASK;
pass |= FR_BLOCK;
}
}
*passp = pass;
}
return fin->fin_fr;
}
#endif /* IPFILTER_LOG */
/* ------------------------------------------------------------------------ */
/* Function: ipf_cksum */
/* Returns: u_short - IP header checksum */
/* Parameters: addr(I) - pointer to start of buffer to checksum */
/* len(I) - length of buffer in bytes */
/* */
/* Calculate the two's complement 16 bit checksum of the buffer passed. */
/* */
/* N.B.: addr should be 16bit aligned. */
/* ------------------------------------------------------------------------ */
u_short ipf_cksum(addr, len)
u_short *addr;
int len;
{
u_32_t sum = 0;
for (sum = 0; len > 1; len -= 2)
sum += *addr++;
/* mop up an odd byte, if necessary */
if (len == 1)
sum += *(u_char *)addr;
/*
* add back carry outs from top 16 bits to low 16 bits
*/
sum = (sum >> 16) + (sum & 0xffff); /* add hi 16 to low 16 */
sum += (sum >> 16); /* add carry */
return (u_short)(~sum);
}
/* ------------------------------------------------------------------------ */
/* Function: fr_cksum */
/* Returns: u_short - layer 4 checksum */
/* Parameters: m(I ) - pointer to buffer holding packet */
/* ip(I) - pointer to IP header */
/* l4proto(I) - protocol to caclulate checksum for */
/* l4hdr(I) - pointer to layer 4 header */
/* */
/* Calculates the TCP checksum for the packet held in "m", using the data */
/* in the IP header "ip" to seed it. */
/* */
/* NB: This function assumes we've pullup'd enough for all of the IP header */
/* and the TCP header. We also assume that data blocks aren't allocated in */
/* odd sizes. */
/* */
/* Expects ip_len to be in host byte order when called. */
/* ------------------------------------------------------------------------ */
u_short fr_cksum(m, ip, l4proto, l4hdr)
mb_t *m;
ip_t *ip;
int l4proto;
void *l4hdr;
{
u_short *sp, slen, sumsave, l4hlen, *csump;
u_int sum, sum2;
int hlen;
#ifdef USE_INET6
ip6_t *ip6;
#endif
csump = NULL;
sumsave = 0;
l4hlen = 0;
sp = NULL;
slen = 0;
hlen = 0;
sum = 0;
/*
* Add up IP Header portion
*/
#ifdef USE_INET6
if (IP_V(ip) == 4) {
#endif
hlen = IP_HL(ip) << 2;
slen = ip->ip_len - hlen;
sum = htons((u_short)l4proto);
sum += htons(slen);
sp = (u_short *)&ip->ip_src;
sum += *sp++; /* ip_src */
sum += *sp++;
sum += *sp++; /* ip_dst */
sum += *sp++;
#ifdef USE_INET6
} else if (IP_V(ip) == 6) {
ip6 = (ip6_t *)ip;
hlen = sizeof(*ip6);
slen = ntohs(ip6->ip6_plen);
sum = htons((u_short)l4proto);
sum += htons(slen);
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++;
}
#endif
switch (l4proto)
{
case IPPROTO_UDP :
csump = &((udphdr_t *)l4hdr)->uh_sum;
l4hlen = sizeof(udphdr_t);
break;
case IPPROTO_TCP :
csump = &((tcphdr_t *)l4hdr)->th_sum;
l4hlen = sizeof(tcphdr_t);
break;
case IPPROTO_ICMP :
csump = &((icmphdr_t *)l4hdr)->icmp_cksum;
l4hlen = 4;
sum = 0;
break;
default :
break;
}
if (csump != NULL) {
sumsave = *csump;
*csump = 0;
}
l4hlen = l4hlen; /* LINT */
#ifdef _KERNEL
# ifdef MENTAT
{
void *rp = m->b_rptr;
if ((unsigned char *)ip > m->b_rptr && (unsigned char *)ip < m->b_wptr)
m->b_rptr = (u_char *)ip;
sum2 = ip_cksum(m, hlen, sum); /* hlen == offset */
m->b_rptr = rp;
sum2 = (u_short)(~sum2 & 0xffff);
}
# else /* MENTAT */
# if defined(BSD) || defined(sun)
# if BSD >= 199103
m->m_data += hlen;
# else
m->m_off += hlen;
# endif
m->m_len -= hlen;
sum2 = in_cksum(m, slen);
m->m_len += hlen;
# if BSD >= 199103
m->m_data -= hlen;
# else
m->m_off -= hlen;
# endif
/*
* 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;
# else /* defined(BSD) || defined(sun) */
{
union {
u_char c[2];
u_short s;
} bytes;
u_short len = ip->ip_len;
# if defined(__sgi)
int add;
# endif
/*
* Add up IP Header portion
*/
if (sp != (u_short *)l4hdr)
sp = (u_short *)l4hdr;
switch (l4proto)
{
case IPPROTO_UDP :
sum += *sp++; /* sport */
sum += *sp++; /* dport */
sum += *sp++; /* udp length */
sum += *sp++; /* checksum */
break;
case IPPROTO_TCP :
sum += *sp++; /* sport */
sum += *sp++; /* dport */
sum += *sp++; /* seq */
sum += *sp++;
sum += *sp++; /* ack */
sum += *sp++;
sum += *sp++; /* off */
sum += *sp++; /* win */
sum += *sp++; /* checksum */
sum += *sp++; /* urp */
break;
case IPPROTO_ICMP :
sum = *sp++; /* type/code */
sum += *sp++; /* checksum */
break;
}
# ifdef __sgi
/*
* In case we had to copy the IP & TCP header out of mbufs,
* skip over the mbuf bits which are the header
*/
if ((caddr_t)ip != mtod(m, caddr_t)) {
hlen = (caddr_t)sp - (caddr_t)ip;
while (hlen) {
add = MIN(hlen, m->m_len);
sp = (u_short *)(mtod(m, caddr_t) + add);
hlen -= add;
if (add == m->m_len) {
m = m->m_next;
if (!hlen) {
if (!m)
break;
sp = mtod(m, u_short *);
}
PANIC((!m),("fr_cksum(1): not enough data"));
}
}
}
# endif
len -= (l4hlen + hlen);
if (len <= 0)
goto nodata;
while (len > 1) {
if (((caddr_t)sp - mtod(m, caddr_t)) >= m->m_len) {
m = m->m_next;
PANIC((!m),("fr_cksum(2): not enough data"));
sp = mtod(m, u_short *);
}
if (((caddr_t)(sp + 1) - mtod(m, caddr_t)) > m->m_len) {
bytes.c[0] = *(u_char *)sp;
m = m->m_next;
PANIC((!m),("fr_cksum(3): not enough data"));
sp = mtod(m, u_short *);
bytes.c[1] = *(u_char *)sp;
sum += bytes.s;
sp = (u_short *)((u_char *)sp + 1);
}
if ((u_long)sp & 1) {
bcopy((char *)sp++, (char *)&bytes.s, sizeof(bytes.s));
sum += bytes.s;
} else
sum += *sp++;
len -= 2;
}
if (len != 0)
sum += ntohs(*(u_char *)sp << 8);
nodata:
while (sum > 0xffff)
sum = (sum & 0xffff) + (sum >> 16);
sum2 = (u_short)(~sum & 0xffff);
}
# endif /* defined(BSD) || defined(sun) */
# endif /* MENTAT */
#else /* _KERNEL */
for (; slen > 1; slen -= 2)
sum += *sp++;
if (slen)
sum += ntohs(*(u_char *)sp << 8);
while (sum > 0xffff)
sum = (sum & 0xffff) + (sum >> 16);
sum2 = (u_short)(~sum & 0xffff);
#endif /* _KERNEL */
if (csump != NULL)
*csump = sumsave;
return sum2;
}
#if defined(_KERNEL) && ( ((BSD < 199103) && !defined(MENTAT)) || \
defined(__sgi) ) && !defined(linux)
/*
* Copyright (c) 1982, 1986, 1988, 1991, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)uipc_mbuf.c 8.2 (Berkeley) 1/4/94
* Id: fil.c,v 2.243.2.46 2005/01/09 01:20:03 darrenr Exp
*/
/*
* Copy data from an mbuf chain starting "off" bytes from the beginning,
* continuing for "len" bytes, into the indicated buffer.
*/
void
m_copydata(m, off, len, cp)
mb_t *m;
int off;
int len;
caddr_t cp;
{
unsigned count;
if (off < 0 || len < 0)
panic("m_copydata");
while (off > 0) {
if (m == 0)
panic("m_copydata");
if (off < m->m_len)
break;
off -= m->m_len;
m = m->m_next;
}
while (len > 0) {
if (m == 0)
panic("m_copydata");
count = MIN(m->m_len - off, len);
bcopy(mtod(m, caddr_t) + off, cp, count);
len -= count;
cp += count;
off = 0;
m = m->m_next;
}
}
/*
* Copy data from a buffer back into the indicated mbuf chain,
* starting "off" bytes from the beginning, extending the mbuf
* chain if necessary.
*/
void
m_copyback(m0, off, len, cp)
struct mbuf *m0;
int off;
int len;
caddr_t cp;
{
int mlen;
struct mbuf *m = m0, *n;
int totlen = 0;
if (m0 == 0)
return;
while (off > (mlen = m->m_len)) {
off -= mlen;
totlen += mlen;
if (m->m_next == 0) {
n = m_getclr(M_DONTWAIT, m->m_type);
if (n == 0)
goto out;
n->m_len = min(MLEN, len + off);
m->m_next = n;
}
m = m->m_next;
}
while (len > 0) {
mlen = min (m->m_len - off, len);
bcopy(cp, off + mtod(m, caddr_t), (unsigned)mlen);
cp += mlen;
len -= mlen;
mlen += off;
off = 0;
totlen += mlen;
if (len == 0)
break;
if (m->m_next == 0) {
n = m_get(M_DONTWAIT, m->m_type);
if (n == 0)
break;
n->m_len = min(MLEN, len);
m->m_next = n;
}
m = m->m_next;
}
out:
#if 0
if (((m = m0)->m_flags & M_PKTHDR) && (m->m_pkthdr.len < totlen))
m->m_pkthdr.len = totlen;
#endif
return;
}
#endif /* (_KERNEL) && ( ((BSD < 199103) && !MENTAT) || __sgi) */
/* ------------------------------------------------------------------------ */
/* Function: fr_findgroup */
/* Returns: frgroup_t * - NULL = group not found, else pointer to group */
/* Parameters: group(I) - group name to search for */
/* unit(I) - device to which this group belongs */
/* set(I) - which set of rules (inactive/inactive) this is */
/* fgpp(O) - pointer to place to store pointer to the pointer */
/* to where to add the next (last) group or where */
/* to delete group from. */
/* */
/* Search amongst the defined groups for a particular group number. */
/* ------------------------------------------------------------------------ */
frgroup_t *fr_findgroup(group, unit, set, fgpp)
char *group;
minor_t unit;
int set;
frgroup_t ***fgpp;
{
frgroup_t *fg, **fgp;
/*
* Which list of groups to search in is dependant on which list of
* rules are being operated on.
*/
fgp = &ipfgroups[unit][set];
while ((fg = *fgp) != NULL) {
if (strncmp(group, fg->fg_name, FR_GROUPLEN) == 0)
break;
else
fgp = &fg->fg_next;
}
if (fgpp != NULL)
*fgpp = fgp;
return fg;
}
/* ------------------------------------------------------------------------ */
/* Function: fr_addgroup */
/* Returns: frgroup_t * - NULL == did not create group, */
/* != NULL == pointer to the group */
/* Parameters: num(I) - group number to add */
/* head(I) - rule pointer that is using this as the head */
/* flags(I) - rule flags which describe the type of rule it is */
/* unit(I) - device to which this group will belong to */
/* set(I) - which set of rules (inactive/inactive) this is */
/* Write Locks: ipf_mutex */
/* */
/* Add a new group head, or if it already exists, increase the reference */
/* count to it. */
/* ------------------------------------------------------------------------ */
frgroup_t *fr_addgroup(group, head, flags, unit, set)
char *group;
void *head;
u_32_t flags;
minor_t unit;
int set;
{
frgroup_t *fg, **fgp;
u_32_t gflags;
if (group == NULL)
return NULL;
if (unit == IPL_LOGIPF && *group == '\0')
return NULL;
fgp = NULL;
gflags = flags & FR_INOUT;
fg = fr_findgroup(group, unit, set, &fgp);
if (fg != NULL) {
if (fg->fg_flags == 0)
fg->fg_flags = gflags;
else if (gflags != fg->fg_flags)
return NULL;
fg->fg_ref++;
return fg;
}
KMALLOC(fg, frgroup_t *);
if (fg != NULL) {
fg->fg_head = head;
fg->fg_start = NULL;
fg->fg_next = *fgp;
bcopy(group, fg->fg_name, FR_GROUPLEN);
fg->fg_flags = gflags;
fg->fg_ref = 1;
*fgp = fg;
}
return fg;
}
/* ------------------------------------------------------------------------ */
/* Function: fr_delgroup */
/* Returns: Nil */
/* Parameters: group(I) - group name to delete */
/* unit(I) - device to which this group belongs */
/* set(I) - which set of rules (inactive/inactive) this is */
/* Write Locks: ipf_mutex */
/* */
/* Attempt to delete a group head. */
/* Only do this when its reference count reaches 0. */
/* ------------------------------------------------------------------------ */
void fr_delgroup(group, unit, set)
char *group;
minor_t unit;
int set;
{
frgroup_t *fg, **fgp;
fg = fr_findgroup(group, unit, set, &fgp);
if (fg == NULL)
return;
fg->fg_ref--;
if (fg->fg_ref == 0) {
*fgp = fg->fg_next;
KFREE(fg);
}
}
/* ------------------------------------------------------------------------ */
/* Function: fr_getrulen */
/* Returns: frentry_t * - NULL == not found, else pointer to rule n */
/* Parameters: unit(I) - device for which to count the rule's number */
/* flags(I) - which set of rules to find the rule in */
/* group(I) - group name */
/* n(I) - rule number to find */
/* */
/* Find rule # n in group # g and return a pointer to it. Return NULl if */
/* group # g doesn't exist or there are less than n rules in the group. */
/* ------------------------------------------------------------------------ */
frentry_t *fr_getrulen(unit, group, n)
int unit;
char *group;
u_32_t n;
{
frentry_t *fr;
frgroup_t *fg;
fg = fr_findgroup(group, unit, fr_active, NULL);
if (fg == NULL)
return NULL;
for (fr = fg->fg_head; fr && n; fr = fr->fr_next, n--)
;
if (n != 0)
return NULL;
return fr;
}
/* ------------------------------------------------------------------------ */
/* Function: fr_rulen */
/* Returns: int - >= 0 - rule number, -1 == search failed */
/* Parameters: unit(I) - device for which to count the rule's number */
/* fr(I) - pointer to rule to match */
/* */
/* Return the number for a rule on a specific filtering device. */
/* ------------------------------------------------------------------------ */
int fr_rulen(unit, fr)
int unit;
frentry_t *fr;
{
frentry_t *fh;
frgroup_t *fg;
u_32_t n = 0;
if (fr == NULL)
return -1;
fg = fr_findgroup(fr->fr_group, unit, fr_active, NULL);
if (fg == NULL)
return -1;
for (fh = fg->fg_head; fh; n++, fh = fh->fr_next)
if (fh == fr)
break;
if (fh == NULL)
return -1;
return n;
}
/* ------------------------------------------------------------------------ */
/* Function: frflushlist */
/* Returns: int - >= 0 - number of flushed rules */
/* Parameters: set(I) - which set of rules (inactive/inactive) this is */
/* unit(I) - device for which to flush rules */
/* flags(I) - which set of rules to flush */
/* nfreedp(O) - pointer to int where flush count is stored */
/* listp(I) - pointer to list to flush pointer */
/* Write Locks: ipf_mutex */
/* */
/* Recursively flush rules from the list, descending groups as they are */
/* encountered. if a rule is the head of a group and it has lost all its */
/* group members, then also delete the group reference. nfreedp is needed */
/* to store the accumulating count of rules removed, whereas the returned */
/* value is just the number removed from the current list. The latter is */
/* needed to correctly adjust reference counts on rules that define groups. */
/* */
/* NOTE: Rules not loaded from user space cannot be flushed. */
/* ------------------------------------------------------------------------ */
static int frflushlist(set, unit, nfreedp, listp)
int set;
minor_t unit;
int *nfreedp;
frentry_t **listp;
{
int freed = 0, i;
frentry_t *fp;
while ((fp = *listp) != NULL) {
if ((fp->fr_type & FR_T_BUILTIN) ||
!(fp->fr_flags & FR_COPIED)) {
listp = &fp->fr_next;
continue;
}
*listp = fp->fr_next;
if (fp->fr_grp != NULL) {
i = frflushlist(set, unit, nfreedp, fp->fr_grp);
fp->fr_ref -= i;
}
if (fp->fr_grhead != NULL) {
fr_delgroup(fp->fr_grhead, unit, set);
*fp->fr_grhead = '\0';
}
ASSERT(fp->fr_ref > 0);
fp->fr_next = NULL;
if (fr_derefrule(&fp) == 0)
freed++;
}
*nfreedp += freed;
return freed;
}
/* ------------------------------------------------------------------------ */
/* Function: frflush */
/* Returns: int - >= 0 - number of flushed rules */
/* Parameters: unit(I) - device for which to flush rules */
/* flags(I) - which set of rules to flush */
/* */
/* Calls flushlist() for all filter rules (accounting, firewall - both IPv4 */
/* and IPv6) as defined by the value of flags. */
/* ------------------------------------------------------------------------ */
int frflush(unit, proto, flags)
minor_t unit;
int proto, flags;
{
int flushed = 0, set;
WRITE_ENTER(&ipf_mutex);
bzero((char *)frcache, sizeof(frcache));
set = fr_active;
if ((flags & FR_INACTIVE) == FR_INACTIVE)
set = 1 - set;
if (flags & FR_OUTQUE) {
if (proto == 0 || proto == 6) {
(void) frflushlist(set, unit,
&flushed, &ipfilter6[1][set]);
(void) frflushlist(set, unit,
&flushed, &ipacct6[1][set]);
}
if (proto == 0 || proto == 4) {
(void) frflushlist(set, unit,
&flushed, &ipfilter[1][set]);
(void) frflushlist(set, unit,
&flushed, &ipacct[1][set]);
}
}
if (flags & FR_INQUE) {
if (proto == 0 || proto == 6) {
(void) frflushlist(set, unit,
&flushed, &ipfilter6[0][set]);
(void) frflushlist(set, unit,
&flushed, &ipacct6[0][set]);
}
if (proto == 0 || proto == 4) {
(void) frflushlist(set, unit,
&flushed, &ipfilter[0][set]);
(void) frflushlist(set, unit,
&flushed, &ipacct[0][set]);
}
}
RWLOCK_EXIT(&ipf_mutex);
if (unit == IPL_LOGIPF) {
int tmp;
tmp = frflush(IPL_LOGCOUNT, proto, flags);
if (tmp >= 0)
flushed += tmp;
}
return flushed;
}
/* ------------------------------------------------------------------------ */
/* Function: memstr */
/* Returns: char * - NULL if failed, != NULL pointer to matching bytes */
/* Parameters: src(I) - pointer to byte sequence to match */
/* dst(I) - pointer to byte sequence to search */
/* slen(I) - match length */
/* dlen(I) - length available to search in */
/* */
/* Search dst for a sequence of bytes matching those at src and extend for */
/* slen bytes. */
/* ------------------------------------------------------------------------ */
char *memstr(src, dst, slen, dlen)
char *src, *dst;
int slen, dlen;
{
char *s = NULL;
while (dlen >= slen) {
if (bcmp(src, dst, slen) == 0) {
s = dst;
break;
}
dst++;
dlen--;
}
return s;
}
/* ------------------------------------------------------------------------ */
/* Function: fr_fixskip */
/* Returns: Nil */
/* Parameters: listp(IO) - pointer to start of list with skip rule */
/* rp(I) - rule added/removed with skip in it. */
/* addremove(I) - adjustment (-1/+1) to make to skip count, */
/* depending on whether a rule was just added */
/* or removed. */
/* */
/* Adjust all the rules in a list which would have skip'd past the position */
/* where we are inserting to skip to the right place given the change. */
/* ------------------------------------------------------------------------ */
void fr_fixskip(listp, rp, addremove)
frentry_t **listp, *rp;
int addremove;
{
int rules, rn;
frentry_t *fp;
rules = 0;
for (fp = *listp; (fp != NULL) && (fp != rp); fp = fp->fr_next)
rules++;
if (!fp)
return;
for (rn = 0, fp = *listp; fp && (fp != rp); fp = fp->fr_next, rn++)
if (FR_ISSKIP(fp->fr_flags) && (rn + fp->fr_arg >= rules))
fp->fr_arg += addremove;
}
#ifdef _KERNEL
/* ------------------------------------------------------------------------ */
/* Function: count4bits */
/* Returns: int - >= 0 - number of consecutive bits in input */
/* Parameters: ip(I) - 32bit IP address */
/* */
/* IPv4 ONLY */
/* count consecutive 1's in bit mask. If the mask generated by counting */
/* consecutive 1's is different to that passed, return -1, else return # */
/* of bits. */
/* ------------------------------------------------------------------------ */
int count4bits(ip)
u_32_t ip;
{
u_32_t ipn;
int cnt = 0, i, j;
ip = ipn = ntohl(ip);
for (i = 32; i; i--, ipn *= 2)
if (ipn & 0x80000000)
cnt++;
else
break;
ipn = 0;
for (i = 32, j = cnt; i; i--, j--) {
ipn *= 2;
if (j > 0)
ipn++;
}
if (ipn == ip)
return cnt;
return -1;
}
# if 0
/* ------------------------------------------------------------------------ */
/* Function: count6bits */
/* Returns: int - >= 0 - number of consecutive bits in input */
/* Parameters: msk(I) - pointer to start of IPv6 bitmask */
/* */
/* IPv6 ONLY */
/* count consecutive 1's in bit mask. */
/* ------------------------------------------------------------------------ */
int count6bits(msk)
u_32_t *msk;
{
int i = 0, k;
u_32_t j;
for (k = 3; k >= 0; k--)
if (msk[k] == 0xffffffff)
i += 32;
else {
for (j = msk[k]; j; j <<= 1)
if (j & 0x80000000)
i++;
}
return i;
}
# endif
#endif /* _KERNEL */
/* ------------------------------------------------------------------------ */
/* Function: frsynclist */
/* Returns: void */
/* Parameters: fr(I) - start of filter list to sync interface names for */
/* ifp(I) - interface pointer for limiting sync lookups */
/* Write Locks: ipf_mutex */
/* */
/* Walk through a list of filter rules and resolve any interface names into */
/* pointers. Where dynamic addresses are used, also update the IP address */
/* used in the rule. The interface pointer is used to limit the lookups to */
/* a specific set of matching names if it is non-NULL. */
/* ------------------------------------------------------------------------ */
static void frsynclist(fr, ifp)
frentry_t *fr;
void *ifp;
{
frdest_t *fdp;
int v, i;
for (; fr; fr = fr->fr_next) {
v = fr->fr_v;
/*
* Lookup all the interface names that are part of the rule.
*/
for (i = 0; i < 4; i++) {
if ((ifp != NULL) && (fr->fr_ifas[i] != ifp))
continue;
fr->fr_ifas[i] = fr_resolvenic(fr->fr_ifnames[i], v);
}
if (fr->fr_type == FR_T_IPF) {
if (fr->fr_satype != FRI_NORMAL &&
fr->fr_satype != FRI_LOOKUP) {
(void)fr_ifpaddr(v, fr->fr_satype,
fr->fr_ifas[fr->fr_sifpidx],
&fr->fr_src, &fr->fr_smsk);
}
if (fr->fr_datype != FRI_NORMAL &&
fr->fr_datype != FRI_LOOKUP) {
(void)fr_ifpaddr(v, fr->fr_datype,
fr->fr_ifas[fr->fr_difpidx],
&fr->fr_dst, &fr->fr_dmsk);
}
}
fdp = &fr->fr_tifs[0];
if ((ifp == NULL) || (fdp->fd_ifp == ifp))
fr_resolvedest(fdp, v);
fdp = &fr->fr_tifs[1];
if ((ifp == NULL) || (fdp->fd_ifp == ifp))
fr_resolvedest(fdp, v);
fdp = &fr->fr_dif;
if ((ifp == NULL) || (fdp->fd_ifp == ifp)) {
fr_resolvedest(fdp, v);
fr->fr_flags &= ~FR_DUP;
if ((fdp->fd_ifp != (void *)-1) &&
(fdp->fd_ifp != NULL))
fr->fr_flags |= FR_DUP;
}
#ifdef IPFILTER_LOOKUP
if (fr->fr_type == FR_T_IPF && fr->fr_satype == FRI_LOOKUP &&
fr->fr_srcptr == NULL) {
fr->fr_srcptr = fr_resolvelookup(fr->fr_srctype,
fr->fr_srcnum,
&fr->fr_srcfunc);
}
if (fr->fr_type == FR_T_IPF && fr->fr_datype == FRI_LOOKUP &&
fr->fr_dstptr == NULL) {
fr->fr_dstptr = fr_resolvelookup(fr->fr_dsttype,
fr->fr_dstnum,
&fr->fr_dstfunc);
}
#endif
}
}
#ifdef _KERNEL
/* ------------------------------------------------------------------------ */
/* Function: frsync */
/* Returns: void */
/* Parameters: Nil */
/* */
/* frsync() is called when we suspect that the interface list or */
/* information about interfaces (like IP#) has changed. Go through all */
/* filter rules, NAT entries and the state table and check if anything */
/* needs to be changed/updated. */
/* ------------------------------------------------------------------------ */
void frsync(ifp)
void *ifp;
{
int i;
# if !SOLARIS
fr_natsync(ifp);
fr_statesync(ifp);
# endif
WRITE_ENTER(&ipf_mutex);
frsynclist(ipacct[0][fr_active], ifp);
frsynclist(ipacct[1][fr_active], ifp);
frsynclist(ipfilter[0][fr_active], ifp);
frsynclist(ipfilter[1][fr_active], ifp);
frsynclist(ipacct6[0][fr_active], ifp);
frsynclist(ipacct6[1][fr_active], ifp);
frsynclist(ipfilter6[0][fr_active], ifp);
frsynclist(ipfilter6[1][fr_active], ifp);
for (i = 0; i < IPL_LOGSIZE; i++) {
frgroup_t *g;
for (g = ipfgroups[i][0]; g != NULL; g = g->fg_next)
frsynclist(g->fg_start, ifp);
for (g = ipfgroups[i][1]; g != NULL; g = g->fg_next)
frsynclist(g->fg_start, ifp);
}
RWLOCK_EXIT(&ipf_mutex);
}
/*
* In the functions below, bcopy() is called because the pointer being
* copied _from_ in this instance is a pointer to a char buf (which could
* end up being unaligned) and on the kernel's local stack.
*/
/* ------------------------------------------------------------------------ */
/* Function: copyinptr */
/* Returns: int - 0 = success, else failure */
/* Parameters: src(I) - pointer to the source address */
/* dst(I) - destination address */
/* size(I) - number of bytes to copy */
/* */
/* Copy a block of data in from user space, given a pointer to the pointer */
/* to start copying from (src) and a pointer to where to store it (dst). */
/* NB: src - pointer to user space pointer, dst - kernel space pointer */
/* ------------------------------------------------------------------------ */
int copyinptr(src, dst, size)
void *src, *dst;
size_t size;
{
caddr_t ca;
int err;
# if SOLARIS
err = COPYIN(src, (caddr_t)&ca, sizeof(ca));
if (err != 0)
return err;
# else
bcopy(src, (caddr_t)&ca, sizeof(ca));
# endif
err = COPYIN(ca, dst, size);
return err;
}
/* ------------------------------------------------------------------------ */
/* Function: copyoutptr */
/* Returns: int - 0 = success, else failure */
/* Parameters: src(I) - pointer to the source address */
/* dst(I) - destination address */
/* size(I) - number of bytes to copy */
/* */
/* Copy a block of data out to user space, given a pointer to the pointer */
/* to start copying from (src) and a pointer to where to store it (dst). */
/* NB: src - kernel space pointer, dst - pointer to user space pointer. */
/* ------------------------------------------------------------------------ */
int copyoutptr(src, dst, size)
void *src, *dst;
size_t size;
{
caddr_t ca;
int err;
# if SOLARIS
err = COPYIN(dst, (caddr_t)&ca, sizeof(ca));
if (err != 0)
return err;
# else
bcopy(dst, (caddr_t)&ca, sizeof(ca));
# endif
err = COPYOUT(src, ca, size);
return err;
}
#endif
/* ------------------------------------------------------------------------ */
/* Function: fr_lock */
/* Returns: (void) */
/* Parameters: data(I) - pointer to lock value to set */
/* lockp(O) - pointer to location to store old lock value */
/* */
/* Get the new value for the lock integer, set it and return the old value */
/* in *lockp. */
/* ------------------------------------------------------------------------ */
void fr_lock(data, lockp)
caddr_t data;
int *lockp;
{
int arg;
BCOPYIN(data, (caddr_t)&arg, sizeof(arg));
BCOPYOUT((caddr_t)lockp, data, sizeof(*lockp));
*lockp = arg;
}
/* ------------------------------------------------------------------------ */
/* Function: fr_getstat */
/* Returns: Nil */
/* Parameters: fiop(I) - pointer to ipfilter stats structure */
/* */
/* Stores a copy of current pointers, counters, etc, in the friostat */
/* structure. */
/* ------------------------------------------------------------------------ */
void fr_getstat(fiop)
friostat_t *fiop;
{
int i, j;
bcopy((char *)frstats, (char *)fiop->f_st, sizeof(filterstats_t) * 2);
fiop->f_locks[IPL_LOGSTATE] = fr_state_lock;
fiop->f_locks[IPL_LOGNAT] = fr_nat_lock;
fiop->f_locks[IPL_LOGIPF] = fr_frag_lock;
fiop->f_locks[IPL_LOGAUTH] = fr_auth_lock;
for (i = 0; i < 2; i++)
for (j = 0; j < 2; j++) {
fiop->f_ipf[i][j] = ipfilter[i][j];
fiop->f_acct[i][j] = ipacct[i][j];
fiop->f_ipf6[i][j] = ipfilter6[i][j];
fiop->f_acct6[i][j] = ipacct6[i][j];
}
fiop->f_ticks = fr_ticks;
fiop->f_active = fr_active;
fiop->f_froute[0] = fr_frouteok[0];
fiop->f_froute[1] = fr_frouteok[1];
fiop->f_running = fr_running;
for (i = 0; i < IPL_LOGSIZE; i++) {
fiop->f_groups[i][0] = ipfgroups[i][0];
fiop->f_groups[i][1] = ipfgroups[i][1];
}
#ifdef IPFILTER_LOG
fiop->f_logging = 1;
#else
fiop->f_logging = 0;
#endif
fiop->f_defpass = fr_pass;
fiop->f_features = fr_features;
(void) strncpy(fiop->f_version, ipfilter_version,
sizeof(fiop->f_version));
}
#ifdef USE_INET6
int icmptoicmp6types[ICMP_MAXTYPE+1] = {
ICMP6_ECHO_REPLY, /* 0: ICMP_ECHOREPLY */
-1, /* 1: UNUSED */
-1, /* 2: UNUSED */
ICMP6_DST_UNREACH, /* 3: ICMP_UNREACH */
-1, /* 4: ICMP_SOURCEQUENCH */
ND_REDIRECT, /* 5: ICMP_REDIRECT */
-1, /* 6: UNUSED */
-1, /* 7: UNUSED */
ICMP6_ECHO_REQUEST, /* 8: ICMP_ECHO */
-1, /* 9: UNUSED */
-1, /* 10: UNUSED */
ICMP6_TIME_EXCEEDED, /* 11: ICMP_TIMXCEED */
ICMP6_PARAM_PROB, /* 12: ICMP_PARAMPROB */
-1, /* 13: ICMP_TSTAMP */
-1, /* 14: ICMP_TSTAMPREPLY */
-1, /* 15: ICMP_IREQ */
-1, /* 16: ICMP_IREQREPLY */
-1, /* 17: ICMP_MASKREQ */
-1, /* 18: ICMP_MASKREPLY */
};
int icmptoicmp6unreach[ICMP_MAX_UNREACH] = {
ICMP6_DST_UNREACH_ADDR, /* 0: ICMP_UNREACH_NET */
ICMP6_DST_UNREACH_ADDR, /* 1: ICMP_UNREACH_HOST */
-1, /* 2: ICMP_UNREACH_PROTOCOL */
ICMP6_DST_UNREACH_NOPORT, /* 3: ICMP_UNREACH_PORT */
-1, /* 4: ICMP_UNREACH_NEEDFRAG */
ICMP6_DST_UNREACH_NOTNEIGHBOR, /* 5: ICMP_UNREACH_SRCFAIL */
ICMP6_DST_UNREACH_ADDR, /* 6: ICMP_UNREACH_NET_UNKNOWN */
ICMP6_DST_UNREACH_ADDR, /* 7: ICMP_UNREACH_HOST_UNKNOWN */
-1, /* 8: ICMP_UNREACH_ISOLATED */
ICMP6_DST_UNREACH_ADMIN, /* 9: ICMP_UNREACH_NET_PROHIB */
ICMP6_DST_UNREACH_ADMIN, /* 10: ICMP_UNREACH_HOST_PROHIB */
-1, /* 11: ICMP_UNREACH_TOSNET */
-1, /* 12: ICMP_UNREACH_TOSHOST */
ICMP6_DST_UNREACH_ADMIN, /* 13: ICMP_UNREACH_ADMIN_PROHIBIT */
};
int icmpreplytype6[ICMP6_MAXTYPE + 1];
#endif
int icmpreplytype4[ICMP_MAXTYPE + 1];
/* ------------------------------------------------------------------------ */
/* Function: fr_matchicmpqueryreply */
/* Returns: int - 1 if "icmp" is a valid reply to "ic" else 0. */
/* Parameters: v(I) - IP protocol version (4 or 6) */
/* ic(I) - ICMP information */
/* icmp(I) - ICMP packet header */
/* rev(I) - direction (0 = forward/1 = reverse) of packet */
/* */
/* Check if the ICMP packet defined by the header pointed to by icmp is a */
/* reply to one as described by what's in ic. If it is a match, return 1, */
/* else return 0 for no match. */
/* ------------------------------------------------------------------------ */
int fr_matchicmpqueryreply(v, ic, icmp, rev)
int v;
icmpinfo_t *ic;
icmphdr_t *icmp;
int rev;
{
int ictype;
ictype = ic->ici_type;
if (v == 4) {
/*
* If we matched its type on the way in, then when going out
* it will still be the same type.
*/
if ((!rev && (icmp->icmp_type == ictype)) ||
(rev && (icmpreplytype4[ictype] == icmp->icmp_type))) {
if (icmp->icmp_type != ICMP_ECHOREPLY)
return 1;
if (icmp->icmp_id == ic->ici_id)
return 1;
}
}
#ifdef USE_INET6
else if (v == 6) {
if ((!rev && (icmp->icmp_type == ictype)) ||
(rev && (icmpreplytype6[ictype] == icmp->icmp_type))) {
if (icmp->icmp_type != ICMP6_ECHO_REPLY)
return 1;
if (icmp->icmp_id == ic->ici_id)
return 1;
}
}
#endif
return 0;
}
#ifdef IPFILTER_LOOKUP
/* ------------------------------------------------------------------------ */
/* Function: fr_resolvelookup */
/* Returns: void * - NULL = failure, else success. */
/* Parameters: type(I) - type of lookup these parameters are for. */
/* number(I) - table number to use when searching */
/* funcptr(IO) - pointer to pointer for storing IP address */
/* searching function. */
/* */
/* Search for the "table" number passed in amongst those configured for */
/* that particular type. If the type is recognised then the function to */
/* call to do the IP address search will be change, regardless of whether */
/* or not the "table" number exists. */
/* ------------------------------------------------------------------------ */
static void *fr_resolvelookup(type, number, funcptr)
u_int type, number;
lookupfunc_t *funcptr;
{
char name[FR_GROUPLEN];
iphtable_t *iph;
ip_pool_t *ipo;
void *ptr;
#if defined(SNPRINTF) && defined(_KERNEL)
SNPRINTF(name, sizeof(name), "%u", number);
#else
(void) sprintf(name, "%u", number);
#endif
READ_ENTER(&ip_poolrw);
switch (type)
{
case IPLT_POOL :
# if (defined(__osf__) && defined(_KERNEL))
ptr = NULL;
*funcptr = NULL;
# else
ipo = ip_pool_find(IPL_LOGIPF, name);
ptr = ipo;
if (ipo != NULL) {
ATOMIC_INC32(ipo->ipo_ref);
}
*funcptr = ip_pool_search;
# endif
break;
case IPLT_HASH :
iph = fr_findhtable(IPL_LOGIPF, name);
ptr = iph;
if (iph != NULL) {
ATOMIC_INC32(iph->iph_ref);
}
*funcptr = fr_iphmfindip;
break;
default:
ptr = NULL;
*funcptr = NULL;
break;
}
RWLOCK_EXIT(&ip_poolrw);
return ptr;
}
#endif
/* ------------------------------------------------------------------------ */
/* Function: frrequest */
/* Returns: int - 0 == success, > 0 == errno value */
/* Parameters: unit(I) - device for which this is for */
/* req(I) - ioctl command (SIOC*) */
/* data(I) - pointr to ioctl data */
/* set(I) - 1 or 0 (filter set) */
/* makecopy(I) - flag indicating whether data points to a rule */
/* in kernel space & hence doesn't need copying. */
/* */
/* This function handles all the requests which operate on the list of */
/* filter rules. This includes adding, deleting, insertion. It is also */
/* responsible for creating groups when a "head" rule is loaded. Interface */
/* names are resolved here and other sanity checks are made on the content */
/* of the rule structure being loaded. If a rule has user defined timeouts */
/* then make sure they are created and initialised before exiting. */
/* ------------------------------------------------------------------------ */
int frrequest(unit, req, data, set, makecopy)
int unit;
ioctlcmd_t req;
int set, makecopy;
caddr_t data;
{
frentry_t frd, *fp, *f, **fprev, **ftail;
int error = 0, in, v;
u_int *p, *pp;
frgroup_t *fg;
char *group;
void *ptr;
fg = NULL;
fp = &frd;
if (makecopy != 0) {
error = fr_inobj(data, fp, IPFOBJ_FRENTRY);
if (error)
return EFAULT;
if ((fp->fr_flags & FR_T_BUILTIN) != 0)
return EINVAL;
fp->fr_ref = 0;
fp->fr_flags |= FR_COPIED;
} else {
fp = (frentry_t *)data;
if ((fp->fr_type & FR_T_BUILTIN) == 0)
return EINVAL;
fp->fr_flags &= ~FR_COPIED;
}
if (((fp->fr_dsize == 0) && (fp->fr_data != NULL)) ||
((fp->fr_dsize != 0) && (fp->fr_data == NULL)))
return EINVAL;
v = fp->fr_v;
/*
* Only filter rules for IPv4 or IPv6 are accepted.
*/
if (v == 4)
/*EMPTY*/;
#ifdef USE_INET6
else if (v == 6)
/*EMPTY*/;
#endif
else {
return EINVAL;
}
/*
* If the rule is being loaded from user space, i.e. we had to copy it
* into kernel space, then do not trust the function pointer in the
* rule.
*/
if ((makecopy == 1) && (fp->fr_func != NULL)) {
if (fr_findfunc(fp->fr_func) == NULL)
return ESRCH;
error = fr_funcinit(fp);
if (error != 0)
return error;
}
ptr = NULL;
/*
* Check that the group number does exist and that its use (in/out)
* matches what the rule is.
*/
if (!strncmp(fp->fr_grhead, "0", FR_GROUPLEN))
*fp->fr_grhead = '\0';
group = fp->fr_group;
if (!strncmp(group, "0", FR_GROUPLEN))
*group = '\0';
if (FR_ISACCOUNT(fp->fr_flags))
unit = IPL_LOGCOUNT;
if ((req != (int)SIOCZRLST) && (*group != '\0')) {
fg = fr_findgroup(group, unit, set, NULL);
if (fg == NULL)
return ESRCH;
if (fg->fg_flags == 0)
fg->fg_flags = fp->fr_flags & FR_INOUT;
else if (fg->fg_flags != (fp->fr_flags & FR_INOUT))
return ESRCH;
}
in = (fp->fr_flags & FR_INQUE) ? 0 : 1;
/*
* Work out which rule list this change is being applied to.
*/
ftail = NULL;
fprev = NULL;
if (unit == IPL_LOGAUTH)
fprev = &ipauth;
else if (v == 4) {
if (FR_ISACCOUNT(fp->fr_flags))
fprev = &ipacct[in][set];
else if ((fp->fr_flags & (FR_OUTQUE|FR_INQUE)) != 0)
fprev = &ipfilter[in][set];
} else if (v == 6) {
if (FR_ISACCOUNT(fp->fr_flags))
fprev = &ipacct6[in][set];
else if ((fp->fr_flags & (FR_OUTQUE|FR_INQUE)) != 0)
fprev = &ipfilter6[in][set];
}
if (fprev == NULL)
return ESRCH;
if (*group != '\0') {
if (!fg && !(fg = fr_findgroup(group, unit, set, NULL)))
return ESRCH;
fprev = &fg->fg_start;
}
for (f = *fprev; (f = *fprev) != NULL; fprev = &f->fr_next)
if (fp->fr_collect < f->fr_collect)
break;
ftail = fprev;
/*
* Copy in extra data for the rule.
*/
if (fp->fr_dsize != 0) {
if (makecopy != 0) {
KMALLOCS(ptr, void *, fp->fr_dsize);
if (!ptr)
return ENOMEM;
error = COPYIN(fp->fr_data, ptr, fp->fr_dsize);
} else {
ptr = fp->fr_data;
error = 0;
}
if (error != 0) {
KFREES(ptr, fp->fr_dsize);
return ENOMEM;
}
fp->fr_data = ptr;
} else
fp->fr_data = NULL;
/*
* Perform per-rule type sanity checks of their members.
*/
switch (fp->fr_type & ~FR_T_BUILTIN)
{
#if defined(IPFILTER_BPF)
case FR_T_BPFOPC :
if (fp->fr_dsize == 0)
return EINVAL;
if (!bpf_validate(ptr, fp->fr_dsize/sizeof(struct bpf_insn))) {
if (makecopy && fp->fr_data != NULL) {
KFREES(fp->fr_data, fp->fr_dsize);
}
return EINVAL;
}
break;
#endif
case FR_T_IPF :
if (fp->fr_dsize != sizeof(fripf_t))
return EINVAL;
/*
* Allowing a rule with both "keep state" and "with oow" is
* pointless because adding a state entry to the table will
* fail with the out of window (oow) flag set.
*/
if ((fp->fr_flags & FR_KEEPSTATE) && (fp->fr_flx & FI_OOW))
return EINVAL;
switch (fp->fr_satype)
{
case FRI_BROADCAST :
case FRI_DYNAMIC :
case FRI_NETWORK :
case FRI_NETMASKED :
case FRI_PEERADDR :
if (fp->fr_sifpidx < 0 || fp->fr_sifpidx > 3) {
if (makecopy && fp->fr_data != NULL) {
KFREES(fp->fr_data, fp->fr_dsize);
}
return EINVAL;
}
break;
#ifdef IPFILTER_LOOKUP
case FRI_LOOKUP :
fp->fr_srcptr = fr_resolvelookup(fp->fr_srctype,
fp->fr_srcnum,
&fp->fr_srcfunc);
break;
#endif
default :
break;
}
switch (fp->fr_datype)
{
case FRI_BROADCAST :
case FRI_DYNAMIC :
case FRI_NETWORK :
case FRI_NETMASKED :
case FRI_PEERADDR :
if (fp->fr_difpidx < 0 || fp->fr_difpidx > 3) {
if (makecopy && fp->fr_data != NULL) {
KFREES(fp->fr_data, fp->fr_dsize);
}
return EINVAL;
}
break;
#ifdef IPFILTER_LOOKUP
case FRI_LOOKUP :
fp->fr_dstptr = fr_resolvelookup(fp->fr_dsttype,
fp->fr_dstnum,
&fp->fr_dstfunc);
break;
#endif
default :
break;
}
break;
case FR_T_NONE :
break;
case FR_T_CALLFUNC :
break;
case FR_T_COMPIPF :
break;
default :
if (makecopy && fp->fr_data != NULL) {
KFREES(fp->fr_data, fp->fr_dsize);
}
return EINVAL;
}
/*
* Lookup all the interface names that are part of the rule.
*/
frsynclist(fp, NULL);
fp->fr_statecnt = 0;
/*
* Look for an existing matching filter rule, but don't include the
* next or interface pointer in the comparison (fr_next, fr_ifa).
* This elminates rules which are indentical being loaded. Checksum
* the constant part of the filter rule to make comparisons quicker
* (this meaning no pointers are included).
*/
for (fp->fr_cksum = 0, p = (u_int *)&fp->fr_func, pp = &fp->fr_cksum;
p < pp; p++)
fp->fr_cksum += *p;
pp = (u_int *)(fp->fr_caddr + fp->fr_dsize);
for (p = (u_int *)fp->fr_data; p < pp; p++)
fp->fr_cksum += *p;
WRITE_ENTER(&ipf_mutex);
bzero((char *)frcache, sizeof(frcache));
for (; (f = *ftail) != NULL; ftail = &f->fr_next)
if ((fp->fr_cksum == f->fr_cksum) &&
(f->fr_dsize == fp->fr_dsize) &&
!bcmp((char *)&f->fr_dsize,
(char *)&fp->fr_dsize, FR_CMPSIZ) &&
(!ptr || !f->fr_data ||
!bcmp((char *)ptr, (char *)f->fr_data, f->fr_dsize)))
break;
/*
* If zero'ing statistics, copy current to caller and zero.
*/
if (req == (ioctlcmd_t)SIOCZRLST) {
if (f == NULL)
error = ESRCH;
else {
error = fr_outobj(data, f, IPFOBJ_FRENTRY);
if (error == 0) {
if (f->fr_dsize != 0 && f->fr_data != NULL)
error = COPYOUT(f->fr_data, ptr,
f->fr_dsize);
if (error == 0) {
f->fr_hits = 0;
f->fr_bytes = 0;
}
}
}
if (ptr != NULL && makecopy != 0) {
KFREES(ptr, fp->fr_dsize);
}
RWLOCK_EXIT(&ipf_mutex);
return error;
}
if (!f) {
if (req == (ioctlcmd_t)SIOCINAFR ||
req == (ioctlcmd_t)SIOCINIFR) {
ftail = fprev;
if (fp->fr_hits != 0) {
while (--fp->fr_hits && (f = *ftail))
ftail = &f->fr_next;
}
f = NULL;
ptr = NULL;
error = 0;
}
}
/*
* Request to remove a rule.
*/
if (req == (ioctlcmd_t)SIOCRMAFR || req == (ioctlcmd_t)SIOCRMIFR) {
if (!f)
error = ESRCH;
else {
/*
* Do not allow activity from user space to interfere
* with rules not loaded that way.
*/
if ((makecopy == 1) && !(f->fr_flags & FR_COPIED)) {
error = EPERM;
goto done;
}
/*
* Return EBUSY if the rule is being reference by
* something else (eg state information.
*/
if (f->fr_ref > 1) {
error = EBUSY;
goto done;
}
#ifdef IPFILTER_SCAN
if (f->fr_isctag[0] != '\0' &&
(f->fr_isc != (struct ipscan *)-1))
ipsc_detachfr(f);
#endif
if ((fg != NULL) && (fg->fg_head != NULL))
fg->fg_head->fr_ref--;
if (unit == IPL_LOGAUTH) {
error = fr_preauthcmd(req, f, ftail);
goto done;
}
if (*f->fr_grhead != '\0')
fr_delgroup(f->fr_grhead, unit, set);
fr_fixskip(fprev, f, -1);
*ftail = f->fr_next;
f->fr_next = NULL;
(void)fr_derefrule(&f);
}
} else {
/*
* Not removing, so we must be adding/inserting a rule.
*/
if (f)
error = EEXIST;
else {
if (unit == IPL_LOGAUTH) {
error = fr_preauthcmd(req, fp, ftail);
goto done;
}
if (makecopy) {
KMALLOC(f, frentry_t *);
} else
f = fp;
if (f != NULL) {
if (fg != NULL && fg->fg_head!= NULL )
fg->fg_head->fr_ref++;
if (fp != f)
bcopy((char *)fp, (char *)f,
sizeof(*f));
MUTEX_NUKE(&f->fr_lock);
MUTEX_INIT(&f->fr_lock, "filter rule lock");
#ifdef IPFILTER_SCAN
if (f->fr_isctag[0] != '\0' &&
ipsc_attachfr(f))
f->fr_isc = (struct ipscan *)-1;
#endif
f->fr_hits = 0;
if (makecopy != 0)
f->fr_ref = 1;
f->fr_next = *ftail;
*ftail = f;
if (req == (ioctlcmd_t)SIOCINIFR ||
req == (ioctlcmd_t)SIOCINAFR)
fr_fixskip(fprev, f, 1);
f->fr_grp = NULL;
group = f->fr_grhead;
if (*group != '\0') {
fg = fr_addgroup(group, f, f->fr_flags,
unit, set);
if (fg != NULL)
f->fr_grp = &fg->fg_start;
}
} else
error = ENOMEM;
}
}
done:
RWLOCK_EXIT(&ipf_mutex);
if ((ptr != NULL) && (error != 0) && (makecopy != 0)) {
KFREES(ptr, fp->fr_dsize);
}
return (error);
}
/* ------------------------------------------------------------------------ */
/* Function: fr_funcinit */
/* Returns: int - 0 == success, else ESRCH: cannot resolve rule details */
/* Parameters: fr(I) - pointer to filter rule */
/* */
/* If a rule is a call rule, then check if the function it points to needs */
/* an init function to be called now the rule has been loaded. */
/* ------------------------------------------------------------------------ */
static int fr_funcinit(fr)
frentry_t *fr;
{
ipfunc_resolve_t *ft;
int err;
err = ESRCH;
for (ft = fr_availfuncs; ft->ipfu_addr != NULL; ft++)
if (ft->ipfu_addr == fr->fr_func) {
err = 0;
if (ft->ipfu_init != NULL)
err = (*ft->ipfu_init)(fr);
break;
}
return err;
}
/* ------------------------------------------------------------------------ */
/* Function: fr_findfunc */
/* Returns: ipfunc_t - pointer to function if found, else NULL */
/* Parameters: funcptr(I) - function pointer to lookup */
/* */
/* Look for a function in the table of known functions. */
/* ------------------------------------------------------------------------ */
static ipfunc_t fr_findfunc(funcptr)
ipfunc_t funcptr;
{
ipfunc_resolve_t *ft;
for (ft = fr_availfuncs; ft->ipfu_addr != NULL; ft++)
if (ft->ipfu_addr == funcptr)
return funcptr;
return NULL;
}
/* ------------------------------------------------------------------------ */
/* Function: fr_resolvefunc */
/* Returns: int - 0 == success, else error */
/* Parameters: data(IO) - ioctl data pointer to ipfunc_resolve_t struct */
/* */
/* Copy in a ipfunc_resolve_t structure and then fill in the missing field. */
/* This will either be the function name (if the pointer is set) or the */
/* function pointer if the name is set. When found, fill in the details so */
/* it can be copied back to user space. */
/* ------------------------------------------------------------------------ */
int fr_resolvefunc(data)
void *data;
{
ipfunc_resolve_t res, *ft;
BCOPYIN(data, &res, sizeof(res));
if (res.ipfu_addr == NULL && res.ipfu_name[0] != '\0') {
for (ft = fr_availfuncs; ft->ipfu_addr != NULL; ft++)
if (strncmp(res.ipfu_name, ft->ipfu_name,
sizeof(res.ipfu_name)) == 0) {
res.ipfu_addr = ft->ipfu_addr;
res.ipfu_init = ft->ipfu_init;
if (COPYOUT(&res, data, sizeof(res)) != 0)
return EFAULT;
return 0;
}
}
if (res.ipfu_addr != NULL && res.ipfu_name[0] == '\0') {
for (ft = fr_availfuncs; ft->ipfu_addr != NULL; ft++)
if (ft->ipfu_addr == res.ipfu_addr) {
(void) strncpy(res.ipfu_name, ft->ipfu_name,
sizeof(res.ipfu_name));
res.ipfu_init = ft->ipfu_init;
if (COPYOUT(&res, data, sizeof(res)) != 0)
return EFAULT;
return 0;
}
}
return ESRCH;
}
#if !defined(_KERNEL) || (!defined(__NetBSD__) && !defined(__OpenBSD__) && !defined(__FreeBSD__)) || \
(defined(__FreeBSD__) && (__FreeBSD_version < 490000)) || \
(defined(__NetBSD__) && (__NetBSD_Version__ < 105000000)) || \
(defined(__OpenBSD__) && (OpenBSD < 200006))
/*
* From: NetBSD
* ppsratecheck(): packets (or events) per second limitation.
*/
int
ppsratecheck(lasttime, curpps, maxpps)
struct timeval *lasttime;
int *curpps;
int maxpps; /* maximum pps allowed */
{
struct timeval tv, delta;
int rv;
GETKTIME(&tv);
delta.tv_sec = tv.tv_sec - lasttime->tv_sec;
delta.tv_usec = tv.tv_usec - lasttime->tv_usec;
if (delta.tv_usec < 0) {
delta.tv_sec--;
delta.tv_usec += 1000000;
}
/*
* check for 0,0 is so that the message will be seen at least once.
* if more than one second have passed since the last update of
* lasttime, reset the counter.
*
* we do increment *curpps even in *curpps < maxpps case, as some may
* try to use *curpps for stat purposes as well.
*/
if ((lasttime->tv_sec == 0 && lasttime->tv_usec == 0) ||
delta.tv_sec >= 1) {
*lasttime = tv;
*curpps = 0;
rv = 1;
} else if (maxpps < 0)
rv = 1;
else if (*curpps < maxpps)
rv = 1;
else
rv = 0;
*curpps = *curpps + 1;
return (rv);
}
#endif
/* ------------------------------------------------------------------------ */
/* Function: fr_derefrule */
/* Returns: int - 0 == rule freed up, else rule not freed */
/* Parameters: fr(I) - pointer to filter rule */
/* */
/* Decrement the reference counter to a rule by one. If it reaches zero, */
/* free it and any associated storage space being used by it. */
/* ------------------------------------------------------------------------ */
int fr_derefrule(frp)
frentry_t **frp;
{
frentry_t *fr;
fr = *frp;
MUTEX_ENTER(&fr->fr_lock);
fr->fr_ref--;
if (fr->fr_ref == 0) {
MUTEX_EXIT(&fr->fr_lock);
MUTEX_DESTROY(&fr->fr_lock);
#ifdef IPFILTER_LOOKUP
if (fr->fr_type == FR_T_IPF && fr->fr_satype == FRI_LOOKUP)
ip_lookup_deref(fr->fr_srctype, fr->fr_srcptr);
if (fr->fr_type == FR_T_IPF && fr->fr_datype == FRI_LOOKUP)
ip_lookup_deref(fr->fr_dsttype, fr->fr_dstptr);
#endif
if (fr->fr_dsize) {
KFREES(fr->fr_data, fr->fr_dsize);
}
if ((fr->fr_flags & FR_COPIED) != 0) {
KFREE(fr);
return 0;
}
return 1;
} else {
MUTEX_EXIT(&fr->fr_lock);
}
*frp = NULL;
return -1;
}
#ifdef IPFILTER_LOOKUP
/* ------------------------------------------------------------------------ */
/* Function: fr_grpmapinit */
/* Returns: int - 0 == success, else ESRCH because table entry not found*/
/* Parameters: fr(I) - pointer to rule to find hash table for */
/* */
/* Looks for group hash table fr_arg and stores a pointer to it in fr_ptr. */
/* fr_ptr is later used by fr_srcgrpmap and fr_dstgrpmap. */
/* ------------------------------------------------------------------------ */
static int fr_grpmapinit(fr)
frentry_t *fr;
{
char name[FR_GROUPLEN];
iphtable_t *iph;
#if defined(SNPRINTF) && defined(_KERNEL)
SNPRINTF(name, sizeof(name), "%d", fr->fr_arg);
#else
(void) sprintf(name, "%d", fr->fr_arg);
#endif
iph = fr_findhtable(IPL_LOGIPF, name);
if (iph == NULL)
return ESRCH;
if ((iph->iph_flags & FR_INOUT) != (fr->fr_flags & FR_INOUT))
return ESRCH;
fr->fr_ptr = iph;
return 0;
}
/* ------------------------------------------------------------------------ */
/* Function: fr_srcgrpmap */
/* Returns: frentry_t * - pointer to "new last matching" rule or NULL */
/* Parameters: fin(I) - pointer to packet information */
/* passp(IO) - pointer to current/new filter decision (unused) */
/* */
/* Look for a rule group head in a hash table, using the source address as */
/* the key, and descend into that group and continue matching rules against */
/* the packet. */
/* ------------------------------------------------------------------------ */
frentry_t *fr_srcgrpmap(fin, passp)
fr_info_t *fin;
u_32_t *passp;
{
frgroup_t *fg;
void *rval;
rval = fr_iphmfindgroup(fin->fin_fr->fr_ptr, &fin->fin_src);
if (rval == NULL)
return NULL;
fg = rval;
fin->fin_fr = fg->fg_start;
(void) fr_scanlist(fin, *passp);
return fin->fin_fr;
}
/* ------------------------------------------------------------------------ */
/* Function: fr_dstgrpmap */
/* Returns: frentry_t * - pointer to "new last matching" rule or NULL */
/* Parameters: fin(I) - pointer to packet information */
/* passp(IO) - pointer to current/new filter decision (unused) */
/* */
/* Look for a rule group head in a hash table, using the destination */
/* address as the key, and descend into that group and continue matching */
/* rules against the packet. */
/* ------------------------------------------------------------------------ */
frentry_t *fr_dstgrpmap(fin, passp)
fr_info_t *fin;
u_32_t *passp;
{
frgroup_t *fg;
void *rval;
rval = fr_iphmfindgroup(fin->fin_fr->fr_ptr, &fin->fin_dst);
if (rval == NULL)
return NULL;
fg = rval;
fin->fin_fr = fg->fg_start;
(void) fr_scanlist(fin, *passp);
return fin->fin_fr;
}
#endif /* IPFILTER_LOOKUP */
/* ------------------------------------------------------------------------ */
/* Function: fr_addtimeoutqueue */
/* Returns: struct ifqtq * - NULL if malloc fails, else pointer to */
/* timeout queue with given interval. */
/* Parameters: parent(I) - pointer to pointer to parent node of this list */
/* of interface queues. */
/* seconds(I) - timeout value in seconds for this queue. */
/* */
/* This routine first looks for a timeout queue that matches the interval */
/* being requested. If it finds one, increments the reference counter and */
/* returns a pointer to it. If none are found, it allocates a new one and */
/* inserts it at the top of the list. */
/* ------------------------------------------------------------------------ */
ipftq_t *fr_addtimeoutqueue(parent, seconds)
ipftq_t **parent;
u_int seconds;
{
u_int period;
ipftq_t *ifq;
period = seconds * IPF_HZ_DIVIDE;
MUTEX_ENTER(&ipf_timeoutlock);
for (ifq = *parent; ifq != NULL; ifq = ifq->ifq_next)
if (ifq->ifq_ttl == period)
break;
if (ifq != NULL) {
MUTEX_ENTER(&ifq->ifq_lock);
ifq->ifq_ref++;
MUTEX_EXIT(&ifq->ifq_lock);
MUTEX_EXIT(&ipf_timeoutlock);
return ifq;
}
KMALLOC(ifq, ipftq_t *);
if (ifq != NULL) {
ifq->ifq_ttl = period;
ifq->ifq_head = NULL;
ifq->ifq_tail = &ifq->ifq_head;
ifq->ifq_next = *parent;
ifq->ifq_pnext = parent;
ifq->ifq_ref = 1;
ifq->ifq_flags = IFQF_USER;
*parent = ifq;
fr_userifqs++;
MUTEX_NUKE(&ifq->ifq_lock);
MUTEX_INIT(&ifq->ifq_lock, "ipftq mutex");
}
MUTEX_EXIT(&ipf_timeoutlock);
return ifq;
}
/* ------------------------------------------------------------------------ */
/* Function: fr_deletetimeoutqueue */
/* Returns: Nil */
/* Parameters: difp(I) - timeout queue which is losing a reference. */
/* */
/* This routine must be called when we're discarding a pointer to a timeout */
/* queue object. It takes care of the reference counter and free's it when */
/* it reaches 0. */
/* ------------------------------------------------------------------------ */
void fr_deletetimeoutqueue(ifq)
ipftq_t *ifq;
{
MUTEX_ENTER(&ipf_timeoutlock);
MUTEX_ENTER(&ifq->ifq_lock);
ifq->ifq_ref--;
if ((ifq->ifq_ref == 0) && (ifq->ifq_head == NULL)) {
/*
* Remove from its position in the list.
*/
*ifq->ifq_pnext = ifq->ifq_next;
if (ifq->ifq_next != NULL)
ifq->ifq_next->ifq_pnext = ifq->ifq_pnext;
MUTEX_EXIT(&ifq->ifq_lock); /* Tru64 */
MUTEX_DESTROY(&ifq->ifq_lock);
KFREE(ifq);
fr_userifqs--;
} else {
MUTEX_EXIT(&ifq->ifq_lock);
}
MUTEX_EXIT(&ipf_timeoutlock);
}
/* ------------------------------------------------------------------------ */
/* Function: fr_queuefront */
/* Returns: Nil */
/* Parameters: tqe(I) - pointer to timeout queue entry */
/* */
/* Move a queue entry to the front of the queue, if it isn't already there. */
/* ------------------------------------------------------------------------ */
void fr_queuefront(tqe)
ipftqent_t *tqe;
{
ipftq_t *ifq;
ifq = tqe->tqe_ifq;
if (ifq == NULL)
return;
if (ifq->ifq_head != tqe) {
MUTEX_ENTER(&ifq->ifq_lock);
*tqe->tqe_pnext = tqe->tqe_next;
if (tqe->tqe_next)
tqe->tqe_next->tqe_pnext = tqe->tqe_pnext;
else
ifq->ifq_tail = tqe->tqe_pnext;
tqe->tqe_next = ifq->ifq_head;
ifq->ifq_head->tqe_pnext = &tqe->tqe_next;
ifq->ifq_head = tqe;
tqe->tqe_pnext = &ifq->ifq_head;
MUTEX_EXIT(&ifq->ifq_lock);
}
}
/* ------------------------------------------------------------------------ */
/* Function: fr_queueback */
/* Returns: Nil */
/* Parameters: tqe(I) - pointer to timeout queue entry */
/* */
/* Move a queue entry to the back of the queue, if it isn't already there. */
/* ------------------------------------------------------------------------ */
void fr_queueback(tqe)
ipftqent_t *tqe;
{
ipftq_t *ifq;
ifq = tqe->tqe_ifq;
tqe->tqe_die = fr_ticks + ifq->ifq_ttl;
if (tqe->tqe_next == NULL) /* at the end already ? */
return;
MUTEX_ENTER(&ifq->ifq_lock);
/*
* Remove from list
*/
*tqe->tqe_pnext = tqe->tqe_next;
tqe->tqe_next->tqe_pnext = tqe->tqe_pnext;
/*
* Make it the last entry.
*/
tqe->tqe_next = NULL;
tqe->tqe_pnext = ifq->ifq_tail;
*ifq->ifq_tail = tqe;
ifq->ifq_tail = &tqe->tqe_next;
MUTEX_EXIT(&ifq->ifq_lock);
}
/* ------------------------------------------------------------------------ */
/* Function: fr_queueappend */
/* Returns: Nil */
/* Parameters: tqe(I) - pointer to timeout queue entry */
/* ifq(I) - pointer to timeout queue */
/* parent(I) - owing object pointer */
/* */
/* Add a new item to this queue and put it on the very end. */
/* ------------------------------------------------------------------------ */
void fr_queueappend(tqe, ifq, parent)
ipftqent_t *tqe;
ipftq_t *ifq;
void *parent;
{
MUTEX_ENTER(&ifq->ifq_lock);
tqe->tqe_parent = parent;
tqe->tqe_pnext = ifq->ifq_tail;
*ifq->ifq_tail = tqe;
ifq->ifq_tail = &tqe->tqe_next;
tqe->tqe_next = NULL;
tqe->tqe_ifq = ifq;
tqe->tqe_die = fr_ticks + ifq->ifq_ttl;
MUTEX_EXIT(&ifq->ifq_lock);
}
/* ------------------------------------------------------------------------ */
/* Function: fr_movequeue */
/* Returns: Nil */
/* Parameters: tq(I) - pointer to timeout queue information */
/* oifp(I) - old timeout queue entry was on */
/* nifp(I) - new timeout queue to put entry on */
/* */
/* Move a queue entry from one timeout queue to another timeout queue. */
/* If it notices that the current entry is already last and does not need */
/* to move queue, the return. */
/* ------------------------------------------------------------------------ */
void fr_movequeue(tqe, oifq, nifq)
ipftqent_t *tqe;
ipftq_t *oifq, *nifq;
{
/*
* Is the operation here going to be a no-op ?
*/
if (oifq == nifq && *oifq->ifq_tail == tqe)
return;
/*
* Remove from the old queue
*/
MUTEX_ENTER(&oifq->ifq_lock);
*tqe->tqe_pnext = tqe->tqe_next;
if (tqe->tqe_next)
tqe->tqe_next->tqe_pnext = tqe->tqe_pnext;
else
oifq->ifq_tail = tqe->tqe_pnext;
tqe->tqe_next = NULL;
/*
* If we're moving from one queue to another, release the lock on the
* old queue and get a lock on the new queue. For user defined queues,
* if we're moving off it, call delete in case it can now be freed.
*/
if (oifq != nifq) {
tqe->tqe_ifq = NULL;
MUTEX_EXIT(&oifq->ifq_lock);
if ((oifq->ifq_flags & IFQF_USER) != 0)
fr_deletetimeoutqueue(oifq);
MUTEX_ENTER(&nifq->ifq_lock);
tqe->tqe_ifq = nifq;
nifq->ifq_ref++;
}
/*
* Add to the bottom of the new queue
*/
tqe->tqe_die = fr_ticks + nifq->ifq_ttl;
tqe->tqe_pnext = nifq->ifq_tail;
*nifq->ifq_tail = tqe;
nifq->ifq_tail = &tqe->tqe_next;
MUTEX_EXIT(&nifq->ifq_lock);
}
/* ------------------------------------------------------------------------ */
/* Function: fr_updateipid */
/* Returns: int - 0 == success, -1 == error (packet should be droppped) */
/* Parameters: fin(I) - pointer to packet information */
/* */
/* When we are doing NAT, change the IP of every packet to represent a */
/* single sequence of packets coming from the host, hiding any host */
/* specific sequencing that might otherwise be revealed. If the packet is */
/* a fragment, then store the 'new' IPid in the fragment cache and look up */
/* the fragment cache for non-leading fragments. If a non-leading fragment */
/* has no match in the cache, return an error. */
/* ------------------------------------------------------------------------ */
static INLINE int fr_updateipid(fin)
fr_info_t *fin;
{
u_short id, ido, sums;
u_32_t sumd, sum;
ip_t *ip;
if (fin->fin_off != 0) {
sum = fr_ipid_knownfrag(fin);
if (sum == 0xffffffff)
return -1;
sum &= 0xffff;
id = (u_short)sum;
} else {
id = fr_nextipid(fin);
if (fin->fin_off == 0 && (fin->fin_flx & FI_FRAG) != 0)
(void) fr_ipid_newfrag(fin, (u_32_t)id);
}
ip = fin->fin_ip;
ido = ntohs(ip->ip_id);
if (id == ido)
return 0;
ip->ip_id = htons(id);
CALC_SUMD(ido, id, sumd); /* DESTRUCTIVE MACRO! id,ido change */
sum = (~ntohs(ip->ip_sum)) & 0xffff;
sum += sumd;
sum = (sum >> 16) + (sum & 0xffff);
sum = (sum >> 16) + (sum & 0xffff);
sums = ~(u_short)sum;
ip->ip_sum = htons(sums);
return 0;
}
#ifdef NEED_FRGETIFNAME
/* ------------------------------------------------------------------------ */
/* Function: fr_getifname */
/* Returns: char * - pointer to interface name */
/* Parameters: ifp(I) - pointer to network interface */
/* buffer(O) - pointer to where to store interface name */
/* */
/* Constructs an interface name in the buffer passed. The buffer passed is */
/* expected to be at least LIFNAMSIZ in bytes big. If buffer is passed in */
/* as a NULL pointer then return a pointer to a static array. */
/* ------------------------------------------------------------------------ */
char *fr_getifname(ifp, buffer)
struct ifnet *ifp;
char *buffer;
{
static char namebuf[LIFNAMSIZ];
# if defined(MENTAT) || defined(__FreeBSD__) || defined(__osf__) || \
defined(__sgi) || defined(linux) || \
(defined(sun) && !defined(__SVR4) && !defined(__svr4__))
int unit, space;
char temp[20];
char *s;
# endif
if (buffer == NULL)
buffer = namebuf;
(void) strncpy(buffer, ifp->if_name, LIFNAMSIZ);
buffer[LIFNAMSIZ - 1] = '\0';
# if defined(MENTAT) || defined(__FreeBSD__) || defined(__osf__) || \
defined(__sgi) || \
(defined(sun) && !defined(__SVR4) && !defined(__svr4__))
for (s = buffer; *s; s++)
;
unit = ifp->if_unit;
space = LIFNAMSIZ - (s - buffer);
if (space > 0) {
# if defined(SNPRINTF) && defined(_KERNEL)
SNPRINTF(temp, sizeof(temp), "%d", unit);
# else
(void) sprintf(temp, "%d", unit);
# endif
(void) strncpy(s, temp, space);
}
# endif
return buffer;
}
#endif
/* ------------------------------------------------------------------------ */
/* Function: fr_ioctlswitch */
/* Returns: int - -1 continue processing, else ioctl return value */
/* Parameters: unit(I) - device unit opened */
/* data(I) - pointer to ioctl data */
/* cmd(I) - ioctl command */
/* mode(I) - mode value */
/* */
/* Based on the value of unit, call the appropriate ioctl handler or return */
/* EIO if ipfilter is not running. Also checks if write perms are req'd */
/* for the device in order to execute the ioctl. */
/* ------------------------------------------------------------------------ */
int fr_ioctlswitch(unit, data, cmd, mode)
int unit, mode;
ioctlcmd_t cmd;
void *data;
{
int error = 0;
switch (unit)
{
case IPL_LOGIPF :
error = -1;
break;
case IPL_LOGNAT :
if (fr_running > 0)
error = fr_nat_ioctl(data, cmd, mode);
else
error = EIO;
break;
case IPL_LOGSTATE :
if (fr_running > 0)
error = fr_state_ioctl(data, cmd, mode);
else
error = EIO;
break;
case IPL_LOGAUTH :
if (fr_running > 0) {
if ((cmd == (ioctlcmd_t)SIOCADAFR) ||
(cmd == (ioctlcmd_t)SIOCRMAFR)) {
if (!(mode & FWRITE)) {
error = EPERM;
} else {
error = frrequest(unit, cmd, data,
fr_active, 1);
}
} else {
error = fr_auth_ioctl(data, cmd, mode);
}
} else
error = EIO;
break;
case IPL_LOGSYNC :
#ifdef IPFILTER_SYNC
if (fr_running > 0)
error = fr_sync_ioctl(data, cmd, mode);
else
#endif
error = EIO;
break;
case IPL_LOGSCAN :
#ifdef IPFILTER_SCAN
if (fr_running > 0)
error = fr_scan_ioctl(data, cmd, mode);
else
#endif
error = EIO;
break;
case IPL_LOGLOOKUP :
#ifdef IPFILTER_LOOKUP
if (fr_running > 0)
error = ip_lookup_ioctl(data, cmd, mode);
else
#endif
error = EIO;
break;
default :
error = EIO;
break;
}
return error;
}
/*
* This array defines the expected size of objects coming into the kernel
* for the various recognised object types.
*/
#define NUM_OBJ_TYPES 14
static int fr_objbytes[NUM_OBJ_TYPES][2] = {
{ 1, sizeof(struct frentry) }, /* frentry */
{ 0, sizeof(struct friostat) },
{ 0, sizeof(struct fr_info) },
{ 0, sizeof(struct fr_authstat) },
{ 0, sizeof(struct ipfrstat) },
{ 0, sizeof(struct ipnat) },
{ 0, sizeof(struct natstat) },
{ 0, sizeof(struct ipstate_save) },
{ 1, sizeof(struct nat_save) }, /* nat_save */
{ 0, sizeof(struct natlookup) },
{ 1, sizeof(struct ipstate) }, /* ipstate */
{ 0, sizeof(struct ips_stat) },
{ 0, sizeof(struct frauth) },
{ 0, sizeof(struct ipftune) }
};
/* ------------------------------------------------------------------------ */
/* Function: fr_inobj */
/* Returns: int - 0 = success, else failure */
/* Parameters: data(I) - pointer to ioctl data */
/* ptr(I) - pointer to store real data in */
/* type(I) - type of structure being moved */
/* */
/* Copy in the contents of what the ipfobj_t points to. In future, we */
/* add things to check for version numbers, sizes, etc, to make it backward */
/* compatible at the ABI for user land. */
/* ------------------------------------------------------------------------ */
int fr_inobj(data, ptr, type)
void *data;
void *ptr;
int type;
{
ipfobj_t obj;
int error = 0;
if ((type < 0) || (type > NUM_OBJ_TYPES-1))
return EINVAL;
BCOPYIN((caddr_t)data, (caddr_t)&obj, sizeof(obj));
if (obj.ipfo_type != type)
return EINVAL;
#ifndef IPFILTER_COMPAT
if ((fr_objbytes[type][0] & 1) != 0) {
if (obj.ipfo_size < fr_objbytes[type][1])
return EINVAL;
} else if (obj.ipfo_size != fr_objbytes[type][1])
return EINVAL;
#else
if (obj.ipfo_rev != IPFILTER_VERSION)
/* XXX compatibility hook here */
;
if ((fr_objbytes[type][0] & 1) != 0) {
if (obj.ipfo_size < fr_objbytes[type][1])
/* XXX compatibility hook here */
return EINVAL;
} else if (obj.ipfo_size != fr_objbytes[type][1])
/* XXX compatibility hook here */
return EINVAL;
#endif
if ((fr_objbytes[type][0] & 1) != 0) {
error = COPYIN((caddr_t)obj.ipfo_ptr, (caddr_t)ptr,
fr_objbytes[type][1]);
} else {
error = COPYIN((caddr_t)obj.ipfo_ptr, (caddr_t)ptr,
obj.ipfo_size);
}
return error;
}
/* ------------------------------------------------------------------------ */
/* Function: fr_inobjsz */
/* Returns: int - 0 = success, else failure */
/* Parameters: data(I) - pointer to ioctl data */
/* ptr(I) - pointer to store real data in */
/* type(I) - type of structure being moved */
/* sz(I) - size of data to copy */
/* */
/* As per fr_inobj, except the size of the object to copy in is passed in */
/* but it must not be smaller than the size defined for the type and the */
/* type must allow for varied sized objects. The extra requirement here is */
/* that sz must match the size of the object being passed in - this is not */
/* not possible nor required in fr_inobj(). */
/* ------------------------------------------------------------------------ */
int fr_inobjsz(data, ptr, type, sz)
void *data;
void *ptr;
int type, sz;
{
ipfobj_t obj;
int error;
if ((type < 0) || (type > NUM_OBJ_TYPES-1))
return EINVAL;
if (((fr_objbytes[type][0] & 1) == 0) || (sz < fr_objbytes[type][1]))
return EINVAL;
BCOPYIN((caddr_t)data, (caddr_t)&obj, sizeof(obj));
if (obj.ipfo_type != type)
return EINVAL;
#ifndef IPFILTER_COMPAT
if (obj.ipfo_size != sz)
return EINVAL;
#else
if (obj.ipfo_rev != IPFILTER_VERSION)
/* XXX compatibility hook here */
;
if (obj.ipfo_size != sz)
/* XXX compatibility hook here */
return EINVAL;
#endif
error = COPYIN((caddr_t)obj.ipfo_ptr, (caddr_t)ptr, sz);
return error;
}
/* ------------------------------------------------------------------------ */
/* Function: fr_outobjsz */
/* Returns: int - 0 = success, else failure */
/* Parameters: data(I) - pointer to ioctl data */
/* ptr(I) - pointer to store real data in */
/* type(I) - type of structure being moved */
/* sz(I) - size of data to copy */
/* */
/* As per fr_outobj, except the size of the object to copy out is passed in */
/* but it must not be smaller than the size defined for the type and the */
/* type must allow for varied sized objects. The extra requirement here is */
/* that sz must match the size of the object being passed in - this is not */
/* not possible nor required in fr_outobj(). */
/* ------------------------------------------------------------------------ */
int fr_outobjsz(data, ptr, type, sz)
void *data;
void *ptr;
int type, sz;
{
ipfobj_t obj;
int error;
if ((type < 0) || (type > NUM_OBJ_TYPES-1) ||
((fr_objbytes[type][0] & 1) == 0) ||
(sz < fr_objbytes[type][1]))
return EINVAL;
BCOPYIN((caddr_t)data, (caddr_t)&obj, sizeof(obj));
if (obj.ipfo_type != type)
return EINVAL;
#ifndef IPFILTER_COMPAT
if (obj.ipfo_size != sz)
return EINVAL;
#else
if (obj.ipfo_rev != IPFILTER_VERSION)
/* XXX compatibility hook here */
;
if (obj.ipfo_size != sz)
/* XXX compatibility hook here */
return EINVAL;
#endif
error = COPYOUT((caddr_t)ptr, (caddr_t)obj.ipfo_ptr, sz);
return error;
}
/* ------------------------------------------------------------------------ */
/* Function: fr_outobj */
/* Returns: int - 0 = success, else failure */
/* Parameters: data(I) - pointer to ioctl data */
/* ptr(I) - pointer to store real data in */
/* type(I) - type of structure being moved */
/* */
/* Copy out the contents of what ptr is to where ipfobj points to. In */
/* future, we add things to check for version numbers, sizes, etc, to make */
/* it backward compatible at the ABI for user land. */
/* ------------------------------------------------------------------------ */
int fr_outobj(data, ptr, type)
void *data;
void *ptr;
int type;
{
ipfobj_t obj;
int error;
if ((type < 0) || (type > NUM_OBJ_TYPES-1))
return EINVAL;
BCOPYIN((caddr_t)data, (caddr_t)&obj, sizeof(obj));
if (obj.ipfo_type != type)
return EINVAL;
#ifndef IPFILTER_COMPAT
if ((fr_objbytes[type][0] & 1) != 0) {
if (obj.ipfo_size < fr_objbytes[type][1])
return EINVAL;
} else if (obj.ipfo_size != fr_objbytes[type][1])
return EINVAL;
#else
if (obj.ipfo_rev != IPFILTER_VERSION)
/* XXX compatibility hook here */
;
if ((fr_objbytes[type][0] & 1) != 0) {
if (obj.ipfo_size < fr_objbytes[type][1])
/* XXX compatibility hook here */
return EINVAL;
} else if (obj.ipfo_size != fr_objbytes[type][1])
/* XXX compatibility hook here */
return EINVAL;
#endif
error = COPYOUT((caddr_t)ptr, (caddr_t)obj.ipfo_ptr, obj.ipfo_size);
return error;
}
/* ------------------------------------------------------------------------ */
/* Function: fr_checkl4sum */
/* Returns: int - 0 = good, -1 = bad, 1 = cannot check */
/* Parameters: fin(I) - pointer to packet information */
/* */
/* If possible, calculate the layer 4 checksum for the packet. If this is */
/* not possible, return without indicating a failure or success but in a */
/* way that is ditinguishable. */
/* ------------------------------------------------------------------------ */
int fr_checkl4sum(fin)
fr_info_t *fin;
{
u_short sum, hdrsum, *csump;
udphdr_t *udp;
int dosum;
if ((fin->fin_flx & FI_NOCKSUM) != 0)
return 0;
/*
* If the TCP packet isn't a fragment, isn't too short and otherwise
* isn't already considered "bad", then validate the checksum. If
* this check fails then considered the packet to be "bad".
*/
if ((fin->fin_flx & (FI_FRAG|FI_SHORT|FI_BAD)) != 0)
return 1;
csump = NULL;
hdrsum = 0;
dosum = 0;
sum = 0;
#if SOLARIS && defined(_KERNEL) && (SOLARIS2 >= 6) && defined(ICK_VALID)
if (dohwcksum && ((*fin->fin_mp)->b_ick_flag == ICK_VALID)) {
hdrsum = 0;
sum = 0;
} else {
#endif
switch (fin->fin_p)
{
case IPPROTO_TCP :
csump = &((tcphdr_t *)fin->fin_dp)->th_sum;
dosum = 1;
break;
case IPPROTO_UDP :
udp = fin->fin_dp;
if (udp->uh_sum != 0) {
csump = &udp->uh_sum;
dosum = 1;
}
break;
case IPPROTO_ICMP :
csump = &((struct icmp *)fin->fin_dp)->icmp_cksum;
dosum = 1;
break;
default :
return 1;
/*NOTREACHED*/
}
if (csump != NULL)
hdrsum = *csump;
if (dosum)
sum = fr_cksum(fin->fin_m, fin->fin_ip,
fin->fin_p, fin->fin_dp);
#if SOLARIS && defined(_KERNEL) && (SOLARIS2 >= 6) && defined(ICK_VALID)
}
#endif
#if !defined(_KERNEL)
if (sum == hdrsum) {
FR_DEBUG(("checkl4sum: %hx == %hx\n", sum, hdrsum));
} else {
FR_DEBUG(("checkl4sum: %hx != %hx\n", sum, hdrsum));
}
#endif
if (hdrsum == sum)
return 0;
return -1;
}
/* ------------------------------------------------------------------------ */
/* Function: fr_ifpfillv4addr */
/* Returns: int - 0 = address update, -1 = address not updated */
/* Parameters: atype(I) - type of network address update to perform */
/* sin(I) - pointer to source of address information */
/* mask(I) - pointer to source of netmask information */
/* inp(I) - pointer to destination address store */
/* inpmask(I) - pointer to destination netmask store */
/* */
/* Given a type of network address update (atype) to perform, copy */
/* information from sin/mask into inp/inpmask. If ipnmask is NULL then no */
/* netmask update is performed unless FRI_NETMASKED is passed as atype, in */
/* which case the operation fails. For all values of atype other than */
/* FRI_NETMASKED, if inpmask is non-NULL then the mask is set to an all 1s */
/* value. */
/* ------------------------------------------------------------------------ */
int fr_ifpfillv4addr(atype, sin, mask, inp, inpmask)
int atype;
struct sockaddr_in *sin, *mask;
struct in_addr *inp, *inpmask;
{
if (inpmask != NULL && atype != FRI_NETMASKED)
inpmask->s_addr = 0xffffffff;
if (atype == FRI_NETWORK || atype == FRI_NETMASKED) {
if (atype == FRI_NETMASKED) {
if (inpmask == NULL)
return -1;
inpmask->s_addr = mask->sin_addr.s_addr;
}
inp->s_addr = sin->sin_addr.s_addr & mask->sin_addr.s_addr;
} else {
inp->s_addr = sin->sin_addr.s_addr;
}
return 0;
}
#ifdef USE_INET6
/* ------------------------------------------------------------------------ */
/* Function: fr_ifpfillv6addr */
/* Returns: int - 0 = address update, -1 = address not updated */
/* Parameters: atype(I) - type of network address update to perform */
/* sin(I) - pointer to source of address information */
/* mask(I) - pointer to source of netmask information */
/* inp(I) - pointer to destination address store */
/* inpmask(I) - pointer to destination netmask store */
/* */
/* Given a type of network address update (atype) to perform, copy */
/* information from sin/mask into inp/inpmask. If ipnmask is NULL then no */
/* netmask update is performed unless FRI_NETMASKED is passed as atype, in */
/* which case the operation fails. For all values of atype other than */
/* FRI_NETMASKED, if inpmask is non-NULL then the mask is set to an all 1s */
/* value. */
/* ------------------------------------------------------------------------ */
int fr_ifpfillv6addr(atype, sin, mask, inp, inpmask)
int atype;
struct sockaddr_in6 *sin, *mask;
struct in_addr *inp, *inpmask;
{
i6addr_t *src, *dst, *and, *dmask;
src = (i6addr_t *)&sin->sin6_addr;
and = (i6addr_t *)&mask->sin6_addr;
dst = (i6addr_t *)inp;
dmask = (i6addr_t *)inpmask;
if (inpmask != NULL && atype != FRI_NETMASKED) {
dmask->i6[0] = 0xffffffff;
dmask->i6[1] = 0xffffffff;
dmask->i6[2] = 0xffffffff;
dmask->i6[3] = 0xffffffff;
}
if (atype == FRI_NETWORK || atype == FRI_NETMASKED) {
if (atype == FRI_NETMASKED) {
if (inpmask == NULL)
return -1;
dmask->i6[0] = and->i6[0];
dmask->i6[1] = and->i6[1];
dmask->i6[2] = and->i6[2];
dmask->i6[3] = and->i6[3];
}
dst->i6[0] = src->i6[0] & and->i6[0];
dst->i6[1] = src->i6[1] & and->i6[1];
dst->i6[2] = src->i6[2] & and->i6[2];
dst->i6[3] = src->i6[3] & and->i6[3];
} else {
dst->i6[0] = src->i6[0];
dst->i6[1] = src->i6[1];
dst->i6[2] = src->i6[2];
dst->i6[3] = src->i6[3];
}
return 0;
}
#endif
/* ------------------------------------------------------------------------ */
/* Function: fr_matchtag */
/* Returns: 0 == mismatch, 1 == match. */
/* Parameters: tag1(I) - pointer to first tag to compare */
/* tag2(I) - pointer to second tag to compare */
/* */
/* Returns true (non-zero) or false(0) if the two tag structures can be */
/* considered to be a match or not match, respectively. The tag is 16 */
/* bytes long (16 characters) but that is overlayed with 4 32bit ints so */
/* compare the ints instead, for speed. tag1 is the master of the */
/* comparison. This function should only be called with both tag1 and tag2 */
/* as non-NULL pointers. */
/* ------------------------------------------------------------------------ */
int fr_matchtag(tag1, tag2)
ipftag_t *tag1, *tag2;
{
if (tag1 == tag2)
return 1;
if ((tag1->ipt_num[0] == 0) && (tag2->ipt_num[0] == 0))
return 1;
if ((tag1->ipt_num[0] == tag2->ipt_num[0]) &&
(tag1->ipt_num[1] == tag2->ipt_num[1]) &&
(tag1->ipt_num[2] == tag2->ipt_num[2]) &&
(tag1->ipt_num[3] == tag2->ipt_num[3]))
return 1;
return 0;
}
/* ------------------------------------------------------------------------ */
/* Function: fr_coalesce */
/* Returns: 1 == success, -1 == failure, 0 == no change */
/* Parameters: fin(I) - pointer to packet information */
/* */
/* Attempt to get all of the packet data into a single, contiguous buffer. */
/* If this call returns a failure then the buffers have also been freed. */
/* ------------------------------------------------------------------------ */
int fr_coalesce(fin)
fr_info_t *fin;
{
if ((fin->fin_flx & FI_COALESCE) != 0)
return 1;
/*
* If the mbuf pointers indicate that there is no mbuf to work with,
* return but do not indicate success or failure.
*/
if (fin->fin_m == NULL || fin->fin_mp == NULL)
return 0;
#if defined(_KERNEL)
if (fr_pullup(fin->fin_m, fin, fin->fin_plen) == NULL) {
ATOMIC_INCL(fr_badcoalesces[fin->fin_out]);
# ifdef MENTAT
FREE_MB_T(*fin->fin_mp);
# endif
*fin->fin_mp = NULL;
fin->fin_m = NULL;
return -1;
}
#else
fin = fin; /* LINT */
#endif
return 1;
}
/*
* The following table lists all of the tunable variables that can be
* accessed via SIOCIPFGET/SIOCIPFSET/SIOCIPFGETNEXt. The format of each row
* in the table below is as follows:
*
* pointer to value, name of value, minimum, maximum, size of the value's
* container, value attribute flags
*
* For convienience, IPFT_RDONLY means the value is read-only, IPFT_WRDISABLED
* means the value can only be written to when IPFilter is loaded but disabled.
* The obvious implication is if neither of these are set then the value can be
* changed at any time without harm.
*/
ipftuneable_t ipf_tuneables[] = {
/* filtering */
{ { &fr_flags }, "fr_flags", 0, 0xffffffff,
sizeof(fr_flags), 0 },
{ { &fr_active }, "fr_active", 0, 0,
sizeof(fr_active), IPFT_RDONLY },
{ { &fr_control_forwarding }, "fr_control_forwarding", 0, 1,
sizeof(fr_control_forwarding), 0 },
{ { &fr_update_ipid }, "fr_update_ipid", 0, 1,
sizeof(fr_update_ipid), 0 },
{ { &fr_chksrc }, "fr_chksrc", 0, 1,
sizeof(fr_chksrc), 0 },
{ { &fr_pass }, "fr_pass", 0, 0xffffffff,
sizeof(fr_pass), 0 },
/* state */
{ { &fr_tcpidletimeout }, "fr_tcpidletimeout", 1, 0x7fffffff,
sizeof(fr_tcpidletimeout), IPFT_WRDISABLED },
{ { &fr_tcpclosewait }, "fr_tcpclosewait", 1, 0x7fffffff,
sizeof(fr_tcpclosewait), IPFT_WRDISABLED },
{ { &fr_tcplastack }, "fr_tcplastack", 1, 0x7fffffff,
sizeof(fr_tcplastack), IPFT_WRDISABLED },
{ { &fr_tcptimeout }, "fr_tcptimeout", 1, 0x7fffffff,
sizeof(fr_tcptimeout), IPFT_WRDISABLED },
{ { &fr_tcpclosed }, "fr_tcpclosed", 1, 0x7fffffff,
sizeof(fr_tcpclosed), IPFT_WRDISABLED },
{ { &fr_tcphalfclosed }, "fr_tcphalfclosed", 1, 0x7fffffff,
sizeof(fr_tcphalfclosed), IPFT_WRDISABLED },
{ { &fr_udptimeout }, "fr_udptimeout", 1, 0x7fffffff,
sizeof(fr_udptimeout), IPFT_WRDISABLED },
{ { &fr_udpacktimeout }, "fr_udpacktimeout", 1, 0x7fffffff,
sizeof(fr_udpacktimeout), IPFT_WRDISABLED },
{ { &fr_icmptimeout }, "fr_icmptimeout", 1, 0x7fffffff,
sizeof(fr_icmptimeout), IPFT_WRDISABLED },
{ { &fr_icmpacktimeout }, "fr_icmpacktimeout", 1, 0x7fffffff,
sizeof(fr_icmpacktimeout), IPFT_WRDISABLED },
{ { &fr_statemax }, "fr_statemax", 1, 0x7fffffff,
sizeof(fr_statemax), 0 },
{ { &fr_statesize }, "fr_statesize", 1, 0x7fffffff,
sizeof(fr_statesize), IPFT_WRDISABLED },
{ { &fr_state_lock }, "fr_state_lock", 0, 1,
sizeof(fr_state_lock), IPFT_RDONLY },
{ { &fr_state_maxbucket }, "fr_state_maxbucket", 1, 0x7fffffff,
sizeof(fr_state_maxbucket), IPFT_WRDISABLED },
{ { &fr_state_maxbucket_reset }, "fr_state_maxbucket_reset", 0, 1,
sizeof(fr_state_maxbucket_reset), IPFT_WRDISABLED },
{ { &ipstate_logging }, "ipstate_logging", 0, 1,
sizeof(ipstate_logging), 0 },
/* nat */
{ { &fr_nat_lock }, "fr_nat_lock", 0, 1,
sizeof(fr_nat_lock), IPFT_RDONLY },
{ { &ipf_nattable_sz }, "ipf_nattable_sz", 1, 0x7fffffff,
sizeof(ipf_nattable_sz), IPFT_WRDISABLED },
{ { &ipf_nattable_max }, "ipf_nattable_max", 1, 0x7fffffff,
sizeof(ipf_nattable_max), 0 },
{ { &ipf_natrules_sz }, "ipf_natrules_sz", 1, 0x7fffffff,
sizeof(ipf_natrules_sz), IPFT_WRDISABLED },
{ { &ipf_rdrrules_sz }, "ipf_rdrrules_sz", 1, 0x7fffffff,
sizeof(ipf_rdrrules_sz), IPFT_WRDISABLED },
{ { &ipf_hostmap_sz }, "ipf_hostmap_sz", 1, 0x7fffffff,
sizeof(ipf_hostmap_sz), IPFT_WRDISABLED },
{ { &fr_nat_maxbucket }, "fr_nat_maxbucket", 1, 0x7fffffff,
sizeof(fr_nat_maxbucket), IPFT_WRDISABLED },
{ { &fr_nat_maxbucket_reset }, "fr_nat_maxbucket_reset", 0, 1,
sizeof(fr_nat_maxbucket_reset), IPFT_WRDISABLED },
{ { &nat_logging }, "nat_logging", 0, 1,
sizeof(nat_logging), 0 },
{ { &fr_defnatage }, "fr_defnatage", 1, 0x7fffffff,
sizeof(fr_defnatage), IPFT_WRDISABLED },
{ { &fr_defnaticmpage }, "fr_defnaticmpage", 1, 0x7fffffff,
sizeof(fr_defnaticmpage), IPFT_WRDISABLED },
/* frag */
{ { &ipfr_size }, "ipfr_size", 1, 0x7fffffff,
sizeof(ipfr_size), IPFT_WRDISABLED },
{ { &fr_ipfrttl }, "fr_ipfrttl", 1, 0x7fffffff,
sizeof(fr_ipfrttl), IPFT_WRDISABLED },
#ifdef IPFILTER_LOG
/* log */
{ { &ipl_suppress }, "ipl_suppress", 0, 1,
sizeof(ipl_suppress), 0 },
{ { &ipl_buffer_sz }, "ipl_buffer_sz", 0, 0,
sizeof(ipl_buffer_sz), IPFT_RDONLY },
{ { &ipl_logmax }, "ipl_logmax", 0, 0x7fffffff,
sizeof(ipl_logmax), IPFT_WRDISABLED },
{ { &ipl_logall }, "ipl_logall", 0, 1,
sizeof(ipl_logall), 0 },
{ { &ipl_logsize }, "ipl_logsize", 0, 0x80000,
sizeof(ipl_logsize), 0 },
#endif
{ { NULL }, NULL, 0, 0 }
};
static ipftuneable_t *ipf_tunelist = NULL;
/* ------------------------------------------------------------------------ */
/* Function: fr_findtunebycookie */
/* Returns: NULL = search failed, else pointer to tune struct */
/* Parameters: cookie(I) - cookie value to search for amongst tuneables */
/* next(O) - pointer to place to store the cookie for the */
/* "next" tuneable, if it is desired. */
/* */
/* This function is used to walk through all of the existing tunables with */
/* successive calls. It searches the known tunables for the one which has */
/* a matching value for "cookie" - ie its address. When returning a match, */
/* the next one to be found may be returned inside next. */
/* ------------------------------------------------------------------------ */
static ipftuneable_t *fr_findtunebycookie(cookie, next)
void *cookie, **next;
{
ipftuneable_t *ta, **tap;
for (ta = ipf_tuneables; ta->ipft_name != NULL; ta++)
if (ta == cookie) {
if (next != NULL) {
/*
* If the next entry in the array has a name
* present, then return a pointer to it for
* where to go next, else return a pointer to
* the dynaminc list as a key to search there
* next. This facilitates a weak linking of
* the two "lists" together.
*/
if ((ta + 1)->ipft_name != NULL)
*next = ta + 1;
else
*next = &ipf_tunelist;
}
return ta;
}
for (tap = &ipf_tunelist; (ta = *tap) != NULL; tap = &ta->ipft_next)
if (tap == cookie) {
if (next != NULL)
*next = &ta->ipft_next;
return ta;
}
if (next != NULL)
*next = NULL;
return NULL;
}
/* ------------------------------------------------------------------------ */
/* Function: fr_findtunebyname */
/* Returns: NULL = search failed, else pointer to tune struct */
/* Parameters: name(I) - name of the tuneable entry to find. */
/* */
/* Search the static array of tuneables and the list of dynamic tuneables */
/* for an entry with a matching name. If we can find one, return a pointer */
/* to the matching structure. */
/* ------------------------------------------------------------------------ */
static ipftuneable_t *fr_findtunebyname(name)
char *name;
{
ipftuneable_t *ta;
for (ta = ipf_tuneables; ta->ipft_name != NULL; ta++)
if (!strcmp(ta->ipft_name, name)) {
return ta;
}
for (ta = ipf_tunelist; ta != NULL; ta = ta->ipft_next)
if (!strcmp(ta->ipft_name, name)) {
return ta;
}
return NULL;
}
/* ------------------------------------------------------------------------ */
/* Function: fr_addipftune */
/* Returns: int - 0 == success, else failure */
/* Parameters: newtune - pointer to new tune struct to add to tuneables */
/* */
/* Appends the tune structure pointer to by "newtune" to the end of the */
/* current list of "dynamic" tuneable parameters. Once added, the owner */
/* of the object is not expected to ever change "ipft_next". */
/* ------------------------------------------------------------------------ */
int fr_addipftune(newtune)
ipftuneable_t *newtune;
{
ipftuneable_t *ta, **tap;
ta = fr_findtunebyname(newtune->ipft_name);
if (ta != NULL)
return EEXIST;
for (tap = &ipf_tunelist; *tap != NULL; tap = &(*tap)->ipft_next)
;
newtune->ipft_next = NULL;
*tap = newtune;
return 0;
}
/* ------------------------------------------------------------------------ */
/* Function: fr_delipftune */
/* Returns: int - 0 == success, else failure */
/* Parameters: oldtune - pointer to tune struct to remove from the list of */
/* current dynamic tuneables */
/* */
/* Search for the tune structure, by pointer, in the list of those that are */
/* dynamically added at run time. If found, adjust the list so that this */
/* structure is no longer part of it. */
/* ------------------------------------------------------------------------ */
int fr_delipftune(oldtune)
ipftuneable_t *oldtune;
{
ipftuneable_t *ta, **tap;
for (tap = &ipf_tunelist; (ta = *tap) != NULL; tap = &ta->ipft_next)
if (ta == oldtune) {
*tap = oldtune->ipft_next;
oldtune->ipft_next = NULL;
return 0;
}
return ESRCH;
}
/* ------------------------------------------------------------------------ */
/* Function: fr_ipftune */
/* Returns: int - 0 == success, else failure */
/* Parameters: cmd(I) - ioctl command number */
/* data(I) - pointer to ioctl data structure */
/* */
/* Implement handling of SIOCIPFGETNEXT, SIOCIPFGET and SIOCIPFSET. These */
/* three ioctls provide the means to access and control global variables */
/* within IPFilter, allowing (for example) timeouts and table sizes to be */
/* changed without rebooting, reloading or recompiling. The initialisation */
/* and 'destruction' routines of the various components of ipfilter are all */
/* each responsible for handling their own values being too big. */
/* ------------------------------------------------------------------------ */
int fr_ipftune(cmd, data)
ioctlcmd_t cmd;
void *data;
{
ipftuneable_t *ta;
ipftune_t tu;
void *cookie;
int error;
error = fr_inobj(data, &tu, IPFOBJ_TUNEABLE);
if (error != 0)
return error;
tu.ipft_name[sizeof(tu.ipft_name) - 1] = '\0';
cookie = tu.ipft_cookie;
ta = NULL;
switch (cmd)
{
case SIOCIPFGETNEXT :
/*
* If cookie is non-NULL, assume it to be a pointer to the last
* entry we looked at, so find it (if possible) and return a
* pointer to the next one after it. The last entry in the
* the table is a NULL entry, so when we get to it, set cookie
* to NULL and return that, indicating end of list, erstwhile
* if we come in with cookie set to NULL, we are starting anew
* at the front of the list.
*/
if (cookie != NULL) {
ta = fr_findtunebycookie(cookie, &tu.ipft_cookie);
} else {
ta = ipf_tuneables;
tu.ipft_cookie = ta + 1;
}
if (ta != NULL) {
/*
* Entry found, but does the data pointed to by that
* row fit in what we can return?
*/
if (ta->ipft_sz > sizeof(tu.ipft_un))
return EINVAL;
tu.ipft_vlong = 0;
if (ta->ipft_sz == sizeof(u_long))
tu.ipft_vlong = *ta->ipft_plong;
else if (ta->ipft_sz == sizeof(u_int))
tu.ipft_vint = *ta->ipft_pint;
else if (ta->ipft_sz == sizeof(u_short))
tu.ipft_vshort = *ta->ipft_pshort;
else if (ta->ipft_sz == sizeof(u_char))
tu.ipft_vchar = *ta->ipft_pchar;
tu.ipft_sz = ta->ipft_sz;
tu.ipft_min = ta->ipft_min;
tu.ipft_max = ta->ipft_max;
tu.ipft_flags = ta->ipft_flags;
bcopy(ta->ipft_name, tu.ipft_name,
MIN(sizeof(tu.ipft_name),
strlen(ta->ipft_name) + 1));
}
error = fr_outobj(data, &tu, IPFOBJ_TUNEABLE);
break;
case SIOCIPFGET :
case SIOCIPFSET :
/*
* Search by name or by cookie value for a particular entry
* in the tuning paramter table.
*/
error = ESRCH;
if (cookie != NULL) {
ta = fr_findtunebycookie(cookie, NULL);
if (ta != NULL)
error = 0;
} else if (tu.ipft_name[0] != '\0') {
ta = fr_findtunebyname(tu.ipft_name);
if (ta != NULL)
error = 0;
}
if (error != 0)
break;
if (cmd == (ioctlcmd_t)SIOCIPFGET) {
/*
* Fetch the tuning parameters for a particular value
*/
tu.ipft_vlong = 0;
if (ta->ipft_sz == sizeof(u_long))
tu.ipft_vlong = *ta->ipft_plong;
else if (ta->ipft_sz == sizeof(u_int))
tu.ipft_vint = *ta->ipft_pint;
else if (ta->ipft_sz == sizeof(u_short))
tu.ipft_vshort = *ta->ipft_pshort;
else if (ta->ipft_sz == sizeof(u_char))
tu.ipft_vchar = *ta->ipft_pchar;
tu.ipft_sz = ta->ipft_sz;
tu.ipft_min = ta->ipft_min;
tu.ipft_max = ta->ipft_max;
tu.ipft_flags = ta->ipft_flags;
error = fr_outobj(data, &tu, IPFOBJ_TUNEABLE);
} else if (cmd == (ioctlcmd_t)SIOCIPFSET) {
/*
* Set an internal parameter. The hard part here is
* getting the new value safely and correctly out of
* the kernel (given we only know its size, not type.)
*/
u_long in;
if (((ta->ipft_flags & IPFT_WRDISABLED) != 0) &&
(fr_running > 0)) {
error = EBUSY;
break;
}
in = tu.ipft_vlong;
if (in < ta->ipft_min || in > ta->ipft_max) {
error = EINVAL;
break;
}
if (ta->ipft_sz == sizeof(u_long)) {
tu.ipft_vlong = *ta->ipft_plong;
*ta->ipft_plong = in;
} else if (ta->ipft_sz == sizeof(u_int)) {
tu.ipft_vint = *ta->ipft_pint;
*ta->ipft_pint = (u_int)(in & 0xffffffff);
} else if (ta->ipft_sz == sizeof(u_short)) {
tu.ipft_vshort = *ta->ipft_pshort;
*ta->ipft_pshort = (u_short)(in & 0xffff);
} else if (ta->ipft_sz == sizeof(u_char)) {
tu.ipft_vchar = *ta->ipft_pchar;
*ta->ipft_pchar = (u_char)(in & 0xff);
}
error = fr_outobj(data, &tu, IPFOBJ_TUNEABLE);
}
break;
default :
error = EINVAL;
break;
}
return error;
}
/* ------------------------------------------------------------------------ */
/* Function: fr_initialise */
/* Returns: int - 0 == success, < 0 == failure */
/* Parameters: None. */
/* */
/* Call of the initialise functions for all the various subsystems inside */
/* of IPFilter. If any of them should fail, return immeadiately a failure */
/* BUT do not try to recover from the error here. */
/* ------------------------------------------------------------------------ */
int fr_initialise()
{
int i;
#ifdef IPFILTER_LOG
i = fr_loginit();
if (i < 0)
return -10 + i;
#endif
i = fr_natinit();
if (i < 0)
return -20 + i;
i = fr_stateinit();
if (i < 0)
return -30 + i;
i = fr_authinit();
if (i < 0)
return -40 + i;
i = fr_fraginit();
if (i < 0)
return -50 + i;
i = appr_init();
if (i < 0)
return -60 + i;
#ifdef IPFILTER_SYNC
i = ipfsync_init();
if (i < 0)
return -70 + i;
#endif
#ifdef IPFILTER_SCAN
i = ipsc_init();
if (i < 0)
return -80 + i;
#endif
#ifdef IPFILTER_LOOKUP
i = ip_lookup_init();
if (i < 0)
return -90 + i;
#endif
#ifdef IPFILTER_COMPILED
ipfrule_add();
#endif
return 0;
}
/* ------------------------------------------------------------------------ */
/* Function: fr_deinitialise */
/* Returns: None. */
/* Parameters: None. */
/* */
/* Call all the various subsystem cleanup routines to deallocate memory or */
/* destroy locks or whatever they've done that they need to now undo. */
/* The order here IS important as there are some cross references of */
/* internal data structures. */
/* ------------------------------------------------------------------------ */
void fr_deinitialise()
{
fr_fragunload();
fr_authunload();
fr_stateunload();
#ifdef IPFILTER_SCAN
fr_scanunload();
#endif
fr_natunload();
appr_unload();
#ifdef IPFILTER_COMPILED
ipfrule_remove();
#endif
(void) frflush(IPL_LOGIPF, 0, FR_INQUE|FR_OUTQUE|FR_INACTIVE);
(void) frflush(IPL_LOGIPF, 0, FR_INQUE|FR_OUTQUE);
(void) frflush(IPL_LOGCOUNT, 0, FR_INQUE|FR_OUTQUE|FR_INACTIVE);
(void) frflush(IPL_LOGCOUNT, 0, FR_INQUE|FR_OUTQUE);
#ifdef IPFILTER_LOOKUP
ip_lookup_unload();
#endif
#ifdef IPFILTER_LOG
fr_logunload();
#endif
}
/* ------------------------------------------------------------------------ */
/* Function: fr_zerostats */
/* Returns: int - 0 = success, else failure */
/* Parameters: data(O) - pointer to pointer for copying data back to */
/* */
/* Copies the current statistics out to userspace and then zero's the */
/* current ones in the kernel. The lock is only held across the bzero() as */
/* the copyout may result in paging (ie network activity.) */
/* ------------------------------------------------------------------------ */
int fr_zerostats(data)
caddr_t data;
{
friostat_t fio;
int error;
fr_getstat(&fio);
error = copyoutptr(&fio, data, sizeof(fio));
if (error)
return EFAULT;
WRITE_ENTER(&ipf_mutex);
bzero((char *)frstats, sizeof(*frstats) * 2);
RWLOCK_EXIT(&ipf_mutex);
return 0;
}
/* ------------------------------------------------------------------------ */
/* Function: fr_resolvedest */
/* Returns: Nil */
/* Parameters: fdp(IO) - pointer to destination information to resolve */
/* v(I) - IP protocol version to match */
/* */
/* Looks up an interface name in the frdest structure pointed to by fdp and */
/* if a matching name can be found for the particular IP protocol version */
/* then store the interface pointer in the frdest struct. If no match is */
/* found, then set the interface pointer to be -1 as NULL is considered to */
/* indicate there is no information at all in the structure. */
/* ------------------------------------------------------------------------ */
void fr_resolvedest(fdp, v)
frdest_t *fdp;
int v;
{
void *ifp;
ifp = NULL;
v = v; /* LINT */
if (*fdp->fd_ifname != '\0') {
ifp = GETIFP(fdp->fd_ifname, v);
if (ifp == NULL)
ifp = (void *)-1;
}
fdp->fd_ifp = ifp;
}
/* ------------------------------------------------------------------------ */
/* Function: fr_icmp4errortype */
/* Returns: int - 1 == success, 0 == failure */
/* Parameters: icmptype(I) - ICMP type number */
/* */
/* Tests to see if the ICMP type number passed is an error type or not. */
/* ------------------------------------------------------------------------ */
int fr_icmp4errortype(icmptype)
int icmptype;
{
switch (icmptype)
{
case ICMP_SOURCEQUENCH :
case ICMP_PARAMPROB :
case ICMP_REDIRECT :
case ICMP_TIMXCEED :
case ICMP_UNREACH :
return 1;
default:
return 0;
}
}
/* ------------------------------------------------------------------------ */
/* Function: fr_resolvenic */
/* Returns: void* - NULL = wildcard name, -1 = failed to find NIC, else */
/* pointer to interface structure for NIC */
/* Parameters: name(I) - complete interface name */
/* v(I) - IP protocol version */
/* */
/* Look for a network interface structure that firstly has a matching name */
/* to that passed in and that is also being used for that IP protocol */
/* version (necessary on some platforms where there are separate listings */
/* for both IPv4 and IPv6 on the same physical NIC. */
/* */
/* One might wonder why name gets terminated with a \0 byte in here. The */
/* reason is an interface name could get into the kernel structures of ipf */
/* in any number of ways and so long as they all use the same sized array */
/* to put the name in, it makes sense to ensure it gets null terminated */
/* before it is used for its intended purpose - finding its match in the */
/* kernel's list of configured interfaces. */
/* */
/* NOTE: This SHOULD ONLY be used with IPFilter structures that have an */
/* array for the name that is LIFNAMSIZ bytes (at least) in length. */
/* ------------------------------------------------------------------------ */
void *fr_resolvenic(name, v)
char *name;
int v;
{
void *nic;
if (name[0] == '\0')
return NULL;
if ((name[1] == '\0') && ((name[0] == '-') || (name[0] == '*'))) {
return NULL;
}
name[LIFNAMSIZ - 1] = '\0';
nic = GETIFP(name, v);
if (nic == NULL)
nic = (void *)-1;
return nic;
}
Reference in New Issue View Git Blame Copy Permalink