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This commit was generated by cvs2svn to compensate for changes in r23282,

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This commit is contained in:
Peter Wemm 1997-03-02 15:49:41 +00:00
commit 5c45aebbdc
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=23283
10 changed files with 4233 additions and 0 deletions
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sys/netinet/fil.c Normal file
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@ -0,0 +1,762 @@
/*
* (C)opyright 1993-1996 by Darren Reed.
*
* Redistribution and use in source and binary forms are permitted
* provided that this notice is preserved and due credit is given
* to the original author and the contributors.
*/
#if !defined(lint) && defined(LIBC_SCCS)
static char sccsid[] = "@(#)fil.c 1.36 6/5/96 (C) 1993-1996 Darren Reed";
static char rcsid[] = "$Id: fil.c,v 2.0.1.4 1997/02/04 13:59:41 darrenr Exp $";
#endif
#include <sys/errno.h>
#include <sys/types.h>
#include <sys/param.h>
#include <sys/file.h>
#include <sys/ioctl.h>
#if defined(_KERNEL) || defined(KERNEL)
# include <sys/systm.h>
#else
# include <stdio.h>
# include <string.h>
#endif
#include <sys/uio.h>
#if !defined(__SVR4) && !defined(__svr4__)
# include <sys/mbuf.h>
#else
# include <sys/byteorder.h>
# include <sys/dditypes.h>
# include <sys/stream.h>
#endif
#include <sys/protosw.h>
#include <sys/socket.h>
#include <net/if.h>
#ifdef sun
# include <net/af.h>
#endif
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/ip_var.h>
#include <netinet/tcp.h>
#include <netinet/udp.h>
#include <netinet/tcpip.h>
#include <netinet/ip_icmp.h>
#include "ip_fil.h"
#include "ip_compat.h"
#include "ip_nat.h"
#include "ip_frag.h"
#include "ip_state.h"
#ifndef MIN
#define MIN(a,b) (((a)<(b))?(a):(b))
#endif
#ifndef _KERNEL
#include "ipf.h"
extern int opts;
extern void debug(), verbose();
#define FR_IFVERBOSE(ex,second,verb_pr) if (ex) { verbose verb_pr; second; }
#define FR_IFDEBUG(ex,second,verb_pr) if (ex) { debug verb_pr; second; }
#define FR_VERBOSE(verb_pr) verbose verb_pr
#define FR_DEBUG(verb_pr) debug verb_pr
#define FR_SCANLIST(p, ip, fi, m) fr_scanlist(p, ip, fi)
# if SOLARIS
# define bcmp memcmp
# endif
#else
#define FR_IFVERBOSE(ex,second,verb_pr) ;
#define FR_IFDEBUG(ex,second,verb_pr) ;
#define FR_VERBOSE(verb_pr)
#define FR_DEBUG(verb_pr)
#define FR_SCANLIST(p, ip, fi, m) fr_scanlist(p, ip, fi, m)
extern int send_reset();
# if SOLARIS
extern int icmp_error(), ipfr_fastroute();
extern kmutex_t ipf_mutex, ipl_mutex;
# else
extern void ipfr_fastroute();
# endif
extern int ipl_unreach, ipllog();
#endif
#if SOLARIS
# define SEND_RESET(ip, if, q) send_reset(ip, qif, q)
# define ICMP_ERROR(b, ip, t, c, if, src) \
icmp_error(b, ip, t, c, if, src)
#else
# define SEND_RESET(ip, if, q) send_reset(ip)
# if BSD < 199103
# define ICMP_ERROR(b, ip, t, c, if, src) \
icmp_error(mtod(b, ip_t *), t, c, if, src)
# else
# define ICMP_ERROR(b, ip, t, c, if, src) \
icmp_error(b, t, c, (src).s_addr, if)
# endif
#endif
struct filterstats frstats[2] = {{0,0,0,0,0},{0,0,0,0,0}};
struct frentry *ipfilter[2][2] = { { NULL, NULL }, { NULL, NULL } },
*ipacct[2][2] = { { NULL, NULL }, { NULL, NULL } };
int fr_flags = 0, fr_active = 0;
fr_info_t frcache[2];
/*
* bit values for identifying presence of individual IP options
*/
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 }
};
/*
* bit values for identifying presence of individual IP security options
*/
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 }
};
/*
* compact the IP header into a structure which contains just the info.
* which is useful for comparing IP headers with.
*/
void fr_makefrip(hlen, ip, fin)
int hlen;
ip_t *ip;
fr_info_t *fin;
{
struct optlist *op;
tcphdr_t *tcp;
fr_ip_t *fi = &fin->fin_fi;
u_short optmsk = 0, secmsk = 0, auth = 0;
int i, mv, ol, off;
u_char *s, opt;
fin->fin_fr = NULL;
fin->fin_tcpf = 0;
fin->fin_data[0] = 0;
fin->fin_data[1] = 0;
fin->fin_rule = -1;
#ifdef _KERNEL
fin->fin_icode = ipl_unreach;
#endif
fi->fi_v = ip->ip_v;
fi->fi_tos = ip->ip_tos;
fin->fin_hlen = hlen;
fin->fin_dlen = ip->ip_len - hlen;
tcp = (tcphdr_t *)((char *)ip + hlen);
fin->fin_dp = (void *)tcp;
(*(((u_short *)fi) + 1)) = (*(((u_short *)ip) + 4));
(*(((u_long *)fi) + 1)) = (*(((u_long *)ip) + 3));
(*(((u_long *)fi) + 2)) = (*(((u_long *)ip) + 4));
fi->fi_fl = (hlen > sizeof(struct ip)) ? FI_OPTIONS : 0;
off = (ip->ip_off & 0x1fff) << 3;
if (ip->ip_off & 0x3fff)
fi->fi_fl |= FI_FRAG;
switch (ip->ip_p)
{
case IPPROTO_ICMP :
if ((!IPMINLEN(ip, icmp) && !off) ||
(off && off < sizeof(struct icmp)))
fi->fi_fl |= FI_SHORT;
if (fin->fin_dlen > 1)
fin->fin_data[0] = *(u_short *)tcp;
break;
case IPPROTO_TCP :
fi->fi_fl |= FI_TCPUDP;
if ((!IPMINLEN(ip, tcphdr) && !off) ||
(off && off < sizeof(struct tcphdr)))
fi->fi_fl |= FI_SHORT;
if (!(fi->fi_fl & FI_SHORT) && !off)
fin->fin_tcpf = tcp->th_flags;
goto getports;
case IPPROTO_UDP :
fi->fi_fl |= FI_TCPUDP;
if ((!IPMINLEN(ip, udphdr) && !off) ||
(off && off < sizeof(struct udphdr)))
fi->fi_fl |= FI_SHORT;
getports:
if (!off && (fin->fin_dlen > 3)) {
fin->fin_data[0] = ntohs(tcp->th_sport);
fin->fin_data[1] = ntohs(tcp->th_dport);
}
break;
default :
break;
}
for (s = (u_char *)(ip + 1), hlen -= sizeof(*ip); hlen; ) {
if (!(opt = *s))
break;
ol = (opt == IPOPT_NOP) ? 1 : (int)*(s+1);
if (opt > 1 && (ol < 2 || ol > hlen))
break;
for (i = 9, mv = 4; mv >= 0; ) {
op = ipopts + i;
if (opt == (u_char)op->ol_val) {
optmsk |= op->ol_bit;
if (opt == IPOPT_SECURITY) {
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--;
}
}
break;
}
if (opt < op->ol_val)
i -= mv--;
else
i += mv--;
}
hlen -= ol;
s += ol;
}
if (auth && !(auth & 0x0100))
auth &= 0xff00;
fi->fi_optmsk = optmsk;
fi->fi_secmsk = secmsk;
fi->fi_auth = auth;
}
/*
* check an IP packet for TCP/UDP characteristics such as ports and flags.
*/
int fr_tcpudpchk(fr, fin)
frentry_t *fr;
fr_info_t *fin;
{
register u_short po, tup;
register char i;
register 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 ((i = (int)fr->fr_dcmp)) {
po = fr->fr_dport;
tup = fin->fin_data[1];
/*
* Do opposite test to that required and
* continue if that succeeds.
*/
if (!--i && tup != po) /* EQUAL */
err = 0;
else if (!--i && tup == po) /* NOTEQUAL */
err = 0;
else if (!--i && tup >= po) /* LESSTHAN */
err = 0;
else if (!--i && tup <= po) /* GREATERTHAN */
err = 0;
else if (!--i && tup > po) /* LT or EQ */
err = 0;
else if (!--i && tup < po) /* GT or EQ */
err = 0;
else if (!--i && /* Out of range */
(tup >= po && tup <= fr->fr_dtop))
err = 0;
else if (!--i && /* In range */
(tup <= po || tup >= fr->fr_dtop))
err = 0;
}
/*
* compare source ports
*/
if (err && (i = (int)fr->fr_scmp)) {
po = fr->fr_sport;
tup = fin->fin_data[0];
if (!--i && tup != po)
err = 0;
else if (!--i && tup == po)
err = 0;
else if (!--i && tup >= po)
err = 0;
else if (!--i && tup <= po)
err = 0;
else if (!--i && tup > po)
err = 0;
else if (!--i && tup < po)
err = 0;
else if (!--i && /* Out of range */
(tup >= po && tup <= fr->fr_stop))
err = 0;
else if (!--i && /* In range */
(tup <= po || tup >= fr->fr_stop))
err = 0;
}
/*
* 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_fi.fi_p == IPPROTO_TCP)) {
if (fin->fin_fi.fi_fl & FI_SHORT)
return !(fr->fr_tcpf | fr->fr_tcpfm);
/*
* Match the flags ? If not, abort this match.
*/
if (fr->fr_tcpf &&
fr->fr_tcpf != (fin->fin_tcpf & fr->fr_tcpfm)) {
FR_DEBUG(("f. %#x & %#x != %#x\n", fin->fin_tcpf,
fr->fr_tcpfm, fr->fr_tcpf));
err = 0;
}
}
return err;
}
/*
* Check the input/output list of rules for a match and result.
* Could be per interface, but this gets real nasty when you don't have
* kernel sauce.
*/
int fr_scanlist(pass, ip, fin, m)
int pass;
ip_t *ip;
register fr_info_t *fin;
void *m;
{
register struct frentry *fr;
register fr_ip_t *fi = &fin->fin_fi;
int rulen, portcmp = 0, off;
fr = fin->fin_fr;
fin->fin_fr = NULL;
fin->fin_rule = 0;
off = ip->ip_off & 0x1fff;
pass |= (fi->fi_fl << 20);
if ((fi->fi_fl & FI_TCPUDP) && (fin->fin_dlen > 3) && !off)
portcmp = 1;
for (rulen = 0; fr; fr = fr->fr_next, rulen++) {
/*
* 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", (pass & FR_PASS) ? 'p' : 'b'));
if (fin->fin_ifp && *fr->fr_ifname &&
strcasecmp((char *)fin->fin_ifp, fr->fr_ifname))
continue;
FR_VERBOSE((":i"));
#endif
{
register u_long *ld, *lm, *lip;
register int i;
lip = (u_long *)fi;
lm = (u_long *)&fr->fr_mip;
ld = (u_long *)&fr->fr_ip;
i = ((lip[0] & lm[0]) != ld[0]);
FR_IFDEBUG(i,continue,("0. %#08x & %#08x != %#08x\n",
lip[0], lm[0], ld[0]));
i |= ((lip[1] & lm[1]) != ld[1]);
FR_IFDEBUG(i,continue,("1. %#08x & %#08x != %#08x\n",
lip[1], lm[1], ld[1]));
i |= ((lip[2] & lm[2]) != ld[2]);
FR_IFDEBUG(i,continue,("2. %#08x & %#08x != %#08x\n",
lip[2], lm[2], ld[2]));
i |= ((lip[3] & lm[3]) != ld[3]);
FR_IFDEBUG(i,continue,("3. %#08x & %#08x != %#08x\n",
lip[3], lm[3], ld[3]));
i |= ((lip[4] & lm[4]) != ld[4]);
FR_IFDEBUG(i,continue,("4. %#08x & %#08x != %#08x\n",
lip[4], lm[4], ld[4]));
if (i)
continue;
}
/*
* If a fragment, then only the first has what we're looking
* for here...
*/
if (fi->fi_fl & FI_TCPUDP) {
if (portcmp) {
if (!fr_tcpudpchk(fr, fin))
continue;
} else if (fr->fr_dcmp || fr->fr_scmp || fr->fr_tcpf ||
fr->fr_tcpfm)
continue;
} else if (fi->fi_p == IPPROTO_ICMP) {
if (!off && (fin->fin_dlen > 1)) {
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));
continue;
}
} else if (fr->fr_icmpm || fr->fr_icmp)
continue;
}
FR_VERBOSE(("*"));
/*
* Just log this packet...
*/
pass = fr->fr_flags;
if ((pass & FR_CALLNOW) && fr->fr_func)
pass = (*fr->fr_func)(pass, ip, fin);
#ifdef IPFILTER_LOG
if ((pass & FR_LOGMASK) == FR_LOG) {
if (!ipllog(fr->fr_flags, ip, fin, m))
frstats[fin->fin_out].fr_skip++;
frstats[fin->fin_out].fr_pkl++;
}
#endif /* IPFILTER_LOG */
FR_DEBUG(("pass %#x\n", pass));
fr->fr_hits++;
if (pass & FR_ACCOUNT)
fr->fr_bytes += ip->ip_len;
else
fin->fin_icode = fr->fr_icode;
fin->fin_rule = rulen;
fin->fin_fr = fr;
if (pass & FR_QUICK)
break;
}
return pass;
}
/*
* frcheck - filter check
* check using source and destination addresses/pors in a packet whether
* or not to pass it on or not.
*/
int fr_check(ip, hlen, ifp, out
#ifdef _KERNEL
# if SOLARIS
, qif, q, mp)
qif_t *qif;
queue_t *q;
mblk_t **mp;
# else
, mp)
struct mbuf **mp;
# endif
#else
)
#endif
ip_t *ip;
int hlen;
struct ifnet *ifp;
int out;
{
/*
* The above really sucks, but short of writing a diff
*/
fr_info_t frinfo, *fc;
register fr_info_t *fin = &frinfo;
frentry_t *fr = NULL;
int pass, changed;
#if !defined(__SVR4) && !defined(__svr4__) && defined(_KERNEL)
register struct mbuf *m = *mp;
struct mbuf *mc = NULL;
if ((ip->ip_p == IPPROTO_TCP || ip->ip_p == IPPROTO_UDP ||
ip->ip_p == IPPROTO_ICMP)) {
register int up = MIN(hlen + 8, ip->ip_len);
if (up > m->m_len) {
if ((*mp = m_pullup(m, up)) == 0) {
frstats[out].fr_pull[1]++;
return -1;
} else {
frstats[out].fr_pull[0]++;
m = *mp;
ip = mtod(m, struct ip *);
}
}
}
#endif
#if SOLARIS && defined(_KERNEL)
mblk_t *mc = NULL, *m = qif->qf_m;
#endif
fr_makefrip(hlen, ip, fin);
fin->fin_ifp = ifp;
fin->fin_out = out;
MUTEX_ENTER(&ipf_mutex);
if (!out) {
changed = ip_natin(ip, hlen, fin);
if ((fin->fin_fr = ipacct[0][fr_active]) &&
(FR_SCANLIST(FR_NOMATCH, ip, fin, m) & FR_ACCOUNT))
frstats[0].fr_acct++;
}
if ((pass = ipfr_knownfrag(ip, fin))) {
if ((pass & FR_KEEPSTATE)) {
if (fr_addstate(ip, fin, pass) == -1)
frstats[out].fr_bads++;
else
frstats[out].fr_ads++;
}
} else if ((pass = fr_checkstate(ip, fin))) {
if ((pass & FR_KEEPFRAG)) {
if (fin->fin_fi.fi_fl & FI_FRAG) {
if (ipfr_newfrag(ip, fin, pass) == -1)
frstats[out].fr_bnfr++;
else
frstats[out].fr_nfr++;
} else
frstats[out].fr_cfr++;
}
} else {
fc = frcache + out;
if (fc->fin_fr && !bcmp((char *)fin, (char *)fc, FI_CSIZE)) {
/*
* copy cached data so we can unlock the mutex
* earlier.
*/
bcopy((char *)fc, (char *)fin, sizeof(*fin));
frstats[out].fr_chit++;
pass = fin->fin_fr->fr_flags;
} else {
pass = FR_NOMATCH;
if ((fin->fin_fr = ipfilter[out][fr_active]))
pass = FR_SCANLIST(FR_NOMATCH, ip, fin, m);
bcopy((char *)fin, (char *)fc, FI_CSIZE);
if (pass & FR_NOMATCH) {
frstats[out].fr_nom++;
#ifdef NOMATCH
pass |= NOMATCH;
#endif
}
}
fr = fin->fin_fr;
if ((pass & FR_KEEPFRAG)) {
if (fin->fin_fi.fi_fl & FI_FRAG) {
if (ipfr_newfrag(ip, fin, pass) == -1)
frstats[out].fr_bnfr++;
else
frstats[out].fr_nfr++;
} else
frstats[out].fr_cfr++;
}
if (pass & FR_KEEPSTATE) {
if (fr_addstate(ip, fin, pass) == -1)
frstats[out].fr_bads++;
else
frstats[out].fr_ads++;
}
}
if (fr && fr->fr_func)
pass = (*fr->fr_func)(pass, ip, fin);
if (out) {
if ((fin->fin_fr = ipacct[1][fr_active]) &&
(FR_SCANLIST(FR_NOMATCH, ip, fin, m) & FR_ACCOUNT))
frstats[1].fr_acct++;
fin->fin_fr = NULL;
changed = ip_natout(ip, hlen, fin);
}
fin->fin_fr = fr;
MUTEX_EXIT(&ipf_mutex);
#ifdef IPFILTER_LOG
if ((fr_flags & FF_LOGGING) || (pass & FR_LOGMASK)) {
if ((fr_flags & FF_LOGNOMATCH) && (pass & FR_NOMATCH)) {
pass |= FF_LOGNOMATCH;
frstats[out].fr_npkl++;
goto logit;
} else if (((pass & FR_LOGMASK) == FR_LOGP) ||
((pass & FR_PASS) && (fr_flags & FF_LOGPASS))) {
if ((pass & FR_LOGMASK) != FR_LOGP)
pass |= FF_LOGPASS;
frstats[out].fr_ppkl++;
goto logit;
} else if (((pass & FR_LOGMASK) == FR_LOGB) ||
((pass & FR_BLOCK) && (fr_flags & FF_LOGBLOCK))) {
if ((pass & FR_LOGMASK) != FR_LOGB)
pass |= FF_LOGBLOCK;
frstats[out].fr_bpkl++;
logit:
if (!ipllog(pass, ip, fin, m)) {
frstats[out].fr_skip++;
if ((pass & (FR_PASS|FR_LOGORBLOCK)) ==
(FR_PASS|FR_LOGORBLOCK))
pass ^= FR_PASS|FR_BLOCK;
}
}
}
#endif /* IPFILTER_LOG */
if (pass & FR_PASS)
frstats[out].fr_pass++;
else if (pass & FR_BLOCK) {
frstats[out].fr_block++;
/*
* Should we return an ICMP packet to indicate error
* status passing through the packet filter ?
*/
#ifdef _KERNEL
if (pass & FR_RETICMP) {
# if SOLARIS
ICMP_ERROR(q, ip, ICMP_UNREACH, fin->fin_icode,
qif, ip->ip_src);
# else
ICMP_ERROR(m, ip, ICMP_UNREACH, fin->fin_icode,
ifp, ip->ip_src);
m = NULL; /* freed by icmp_error() */
# endif
frstats[0].fr_ret++;
} else if ((pass & FR_RETRST) &&
!(fin->fin_fi.fi_fl & FI_SHORT)) {
if (SEND_RESET(ip, qif, q) == 0)
frstats[1].fr_ret++;
}
#else
if (pass & FR_RETICMP) {
verbose("- ICMP unreachable sent\n");
frstats[0].fr_ret++;
} else if ((pass & FR_RETRST) &&
!(fin->fin_fi.fi_fl & FI_SHORT)) {
verbose("- TCP RST sent\n");
frstats[1].fr_ret++;
}
#endif
}
#ifdef _KERNEL
# if !SOLARIS
if (pass & FR_DUP)
mc = m_copy(m, 0, M_COPYALL);
if (fr) {
frdest_t *fdp = &fr->fr_tif;
if ((pass & FR_FASTROUTE) ||
(fdp->fd_ifp && fdp->fd_ifp != (struct ifnet *)-1)) {
ipfr_fastroute(m, fin, fdp);
m = *mp = NULL;
pass = 0;
}
if (mc)
ipfr_fastroute(mc, fin, &fr->fr_dif);
}
if (!(pass & FR_PASS) && m)
m_freem(m);
return (pass & FR_PASS) ? 0 : -1;
# else
if (pass & FR_DUP)
mc = dupmsg(m);
if (fr) {
frdest_t *fdp = &fr->fr_tif;
if ((pass & FR_FASTROUTE) ||
(fdp->fd_ifp && fdp->fd_ifp != (struct ifnet *)-1)) {
ipfr_fastroute(qif, ip, m, mp, fin, fdp);
m = *mp = NULL;
}
if (mc)
ipfr_fastroute(qif, ip, mc, mp, fin, &fr->fr_dif);
}
return (pass & FR_PASS) ? changed : -1;
# endif
#else
if (pass & FR_NOMATCH)
return 1;
if (pass & FR_PASS)
return 0;
return -1;
#endif
}
#ifdef IPFILTER_LOG
# if !(defined(_KERNEL))
static void ipllog()
{
verbose("l");
}
# endif
int fr_copytolog(buf, len)
char *buf;
int len;
{
int clen, tail;
tail = (iplh >= iplt) ? (iplbuf + IPLLOGSIZE - iplh) : (iplt - iplh);
clen = MIN(tail, len);
bcopy(buf, iplh, clen);
len -= clen;
tail -= clen;
iplh += clen;
buf += clen;
if (iplh == iplbuf + IPLLOGSIZE) {
iplh = iplbuf;
tail = iplt - iplh;
}
if (len && tail) {
clen = MIN(tail, len);
bcopy(buf, iplh, clen);
len -= clen;
iplh += clen;
}
return len;
}
#endif

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/*
* (C)opyright 1993, 1994, 1995 by Darren Reed.
*
* Redistribution and use in source and binary forms are permitted
* provided that this notice is preserved and due credit is given
* to the original author and the contributors.
*
* @(#)ip_compat.h 1.8 1/14/96
* $Id: ip_compat.h,v 2.0.1.4 1997/02/04 14:24:25 darrenr Exp $
*/
#ifndef __IP_COMPAT_H_
#define __IP_COMPAT_H__
#ifndef SOLARIS
#define SOLARIS (defined(sun) && (defined(__svr4__) || defined(__SVR4)))
#endif
#if SOLARIS
#define MTYPE(m) ((m)->b_datap->db_type)
#endif
#define IPMINLEN(i, h) ((i)->ip_len >= ((i)->ip_hl * 4 + sizeof(struct h)))
#ifndef IP_OFFMASK
#define IP_OFFMASK 0x1fff
#endif
#ifndef MAX
#define MAX(a,b) (((a) > (b)) ? (a) : (b))
#endif
/*
* Security Options for Intenet Protocol (IPSO) as defined in RFC 1108.
*
* Basic Option
*
* 00000001 - (Reserved 4)
* 00111101 - Top Secret
* 01011010 - Secret
* 10010110 - Confidential
* 01100110 - (Reserved 3)
* 11001100 - (Reserved 2)
* 10101011 - Unclassified
* 11110001 - (Reserved 1)
*/
#define IPSO_CLASS_RES4 0x01
#define IPSO_CLASS_TOPS 0x3d
#define IPSO_CLASS_SECR 0x5a
#define IPSO_CLASS_CONF 0x96
#define IPSO_CLASS_RES3 0x66
#define IPSO_CLASS_RES2 0xcc
#define IPSO_CLASS_UNCL 0xab
#define IPSO_CLASS_RES1 0xf1
#define IPSO_AUTH_GENSER 0x80
#define IPSO_AUTH_ESI 0x40
#define IPSO_AUTH_SCI 0x20
#define IPSO_AUTH_NSA 0x10
#define IPSO_AUTH_DOE 0x08
#define IPSO_AUTH_UN 0x06
#define IPSO_AUTH_FTE 0x01
/*
* IP option #defines
*/
/*#define IPOPT_RR 7 */
#define IPOPT_ZSU 10 /* ZSU */
#define IPOPT_MTUP 11 /* MTUP */
#define IPOPT_MTUR 12 /* MTUR */
#define IPOPT_ENCODE 15 /* ENCODE */
/*#define IPOPT_TS 68 */
#define IPOPT_TR 82 /* TR */
/*#define IPOPT_SECURITY 130 */
/*#define IPOPT_LSRR 131 */
#define IPOPT_E_SEC 133 /* E-SEC */
#define IPOPT_CIPSO 134 /* CIPSO */
/*#define IPOPT_SATID 136 */
#ifndef IPOPT_SID
# define IPOPT_SID IPOPT_SATID
#endif
/*#define IPOPT_SSRR 137 */
#define IPOPT_ADDEXT 147 /* ADDEXT */
#define IPOPT_VISA 142 /* VISA */
#define IPOPT_IMITD 144 /* IMITD */
#define IPOPT_EIP 145 /* EIP */
#define IPOPT_FINN 205 /* FINN */
/*
* Build some macros and #defines to enable the same code to compile anywhere
* Well, that's the idea, anyway :-)
*/
#ifdef _KERNEL
# if SOLARIS
# define MUTEX_ENTER(x) mutex_enter(x)
# define MUTEX_EXIT(x) mutex_exit(x)
# define MTOD(m,t) (t)((m)->b_rptr)
# define IRCOPY(a,b,c) copyin((a), (b), (c))
# define IWCOPY(a,b,c) copyout((a), (b), (c))
# else
# define MUTEX_ENTER(x) ;
# define MUTEX_EXIT(x) ;
# ifndef linux
# define MTOD(m,t) mtod(m,t)
# define IRCOPY(a,b,c) bcopy((a), (b), (c))
# define IWCOPY(a,b,c) bcopy((a), (b), (c))
# endif
# endif /* SOLARIS */
# ifdef sun
# if defined(__svr4__) || defined(__SVR4)
# define GETUNIT(n) get_unit((n))
# else
# include <sys/kmem_alloc.h>
# define GETUNIT(n) ifunit((n), IFNAMSIZ)
# endif
# else
# define GETUNIT(n) ifunit((n))
# endif /* sun */
# if defined(sun) && !defined(linux)
# define UIOMOVE(a,b,c,d) uiomove(a,b,c,d)
# define SLEEP(id, n) sleep((id), PZERO+1)
# define KFREE(x) kmem_free((char *)(x), sizeof(*(x)))
# if SOLARIS
typedef struct qif {
struct qif *qf_next;
ill_t *qf_ill;
kmutex_t qf_lock;
void *qf_iptr;
void *qf_optr;
queue_t *qf_in;
queue_t *qf_out;
void *qf_wqinfo;
void *qf_rqinfo;
int (*qf_inp)();
int (*qf_outp)();
mblk_t *qf_m;
int qf_len;
char qf_name[8];
/*
* in case the ILL has disappeared...
*/
int qf_hl; /* header length */
} qif_t;
# define SPLNET(x) ;
# undef SPLX
# define SPLX(x) ;
# ifdef sparc
# define ntohs(x) (x)
# define ntohl(x) (x)
# define htons(x) (x)
# define htonl(x) (x)
# endif
# define KMALLOC(x) kmem_alloc((x), KM_NOSLEEP)
# define GET_MINOR(x) getminor(x)
# else
# define KMALLOC(x) new_kmem_alloc((x), KMEM_NOSLEEP)
# endif /* __svr4__ */
# endif /* sun && !linux */
# ifndef GET_MINOR
# define GET_MINOR(x) minor(x)
# endif
# if BSD >= 199306 || defined(__FreeBSD__)
# include <vm/vm.h>
# if !defined(__FreeBSD__)
# include <vm/vm_extern.h>
# include <sys/proc.h>
extern vm_map_t kmem_map;
# else
# include <vm/vm_kern.h>
# endif /* __FreeBSD__ */
/*
** # define KMALLOC(x) kmem_alloc(kmem_map, (x))
** # define KFREE(x) kmem_free(kmem_map, (vm_offset_t)(x), \
sizeof(*(x)))
*/
# ifdef M_PFIL
# define KMALLOC(x) malloc((x), M_PFIL, M_NOWAIT)
# define KFREE(x) FREE((x), M_PFIL)
# else
# define KMALLOC(x) malloc((x), M_TEMP, M_NOWAIT)
# define KFREE(x) FREE((x), M_TEMP)
# endif
# define UIOMOVE(a,b,c,d) uiomove(a,b,d)
# define SLEEP(id, n) tsleep((id), PPAUSE|PCATCH, n, 0)
# endif /* BSD */
# if defined(NetBSD1_0) && (NetBSD1_0 > 1)
# define SPLNET(x) x = splsoftnet()
# else
# if !SOLARIS
# define SPLNET(x) x = splnet()
# define SPLX(x) (void) splx(x)
# endif
# endif
#else
# ifndef linux
# define MUTEX_ENTER(x) ;
# define MUTEX_EXIT(x) ;
# define SPLNET(x) ;
# define SPLX(x) ;
# define KMALLOC(x) malloc(x)
# define KFREE(x) free(x)
# define GETUNIT(x) (x)
# define IRCOPY(a,b,c) bcopy((a), (b), (c))
# define IWCOPY(a,b,c) bcopy((a), (b), (c))
# endif
#endif /* KERNEL */
#ifdef linux
# define ICMP_UNREACH ICMP_DEST_UNREACH
# define ICMP_SOURCEQUENCH ICMP_SOURCE_QUENCH
# define ICMP_TIMXCEED ICMP_TIME_EXCEEDED
# define ICMP_PARAMPROB ICMP_PARAMETERPROB
# define TH_FIN 0x01
# define TH_SYN 0x02
# define TH_RST 0x04
# define TH_PUSH 0x08
# define TH_ACK 0x10
# define TH_URG 0x20
typedef struct {
__u16 th_sport;
__u16 th_dport;
__u32 th_seq;
__u32 th_ack;
__u8 th_x;
__u8 th_flags;
__u16 th_win;
__u16 th_sum;
__u16 th_urp;
} tcphdr_t;
typedef struct {
__u16 uh_sport;
__u16 uh_dport;
__u16 uh_ulen;
__u16 uh_sun;
} udphdr_t;
typedef struct {
# if defined(__i386__) || defined(__MIPSEL__) || defined(__alpha__) ||\
defined(vax)
__u8 ip_hl:4;
__u8 ip_v:4;
# else
__u8 ip_hl:4;
__u8 ip_v:4;
# endif
__u8 ip_tos;
__u16 ip_len;
__u16 ip_id;
__u16 ip_off;
__u8 ip_ttl;
__u8 ip_p;
__u16 ip_sum;
struct in_addr ip_src;
struct in_addr ip_dst;
} ip_t;
/*
* Structure of an icmp header.
*/
struct icmp {
u_char icmp_type; /* type of message, see below */
u_char icmp_code; /* type sub code */
u_short icmp_cksum; /* ones complement cksum of struct */
union {
u_char ih_pptr; /* ICMP_PARAMPROB */
struct in_addr ih_gwaddr; /* ICMP_REDIRECT */
struct ih_idseq {
n_short icd_id;
n_short icd_seq;
} ih_idseq;
int ih_void;
} icmp_hun;
# define icmp_pptr icmp_hun.ih_pptr
# define icmp_gwaddr icmp_hun.ih_gwaddr
# define icmp_id icmp_hun.ih_idseq.icd_id
# define icmp_seq icmp_hun.ih_idseq.icd_seq
# define icmp_void icmp_hun.ih_void
union {
struct id_ts {
n_time its_otime;
n_time its_rtime;
n_time its_ttime;
} id_ts;
struct id_ip {
ip_t idi_ip;
/* options and then 64 bits of data */
} id_ip;
u_long id_mask;
char id_data[1];
} icmp_dun;
# define icmp_otime icmp_dun.id_ts.its_otime
# define icmp_rtime icmp_dun.id_ts.its_rtime
# define icmp_ttime icmp_dun.id_ts.its_ttime
# define icmp_ip icmp_dun.id_ip.idi_ip
# define icmp_mask icmp_dun.id_mask
# define icmp_data icmp_dun.id_data
};
struct ipovly {
caddr_t ih_next, ih_prev; /* for protocol sequence q's */
u_char ih_x1; /* (unused) */
u_char ih_pr; /* protocol */
short ih_len; /* protocol length */
struct in_addr ih_src; /* source internet address */
struct in_addr ih_dst; /* destination internet address */
};
# define SPLX(x) (void)
# define SPLNET(x) (void)
# define bcopy(a,b,c) memmove(b,a,c)
# define bcmp(a,b,c) memcmp(a,b,c)
# define UNITNAME(n) dev_get((n))
# define ifnet device
# define KMALLOC(x) kmalloc((x), GFP_ATOMIC)
# define KFREE(x) kfree_s((x), sizeof(*(x)))
# define IRCOPY(a,b,c) { \
error = verify_area(VERIFY_READ, \
(b) ,sizeof((b))); \
if (!error) \
memcpy_fromfs((b), (a), (c)); \
}
# define IWCOPY(a,b,c) { \
error = verify_area(VERIFY_WRITE, \
(b) ,sizeof((b))); \
if (!error) \
memcpy_tofs((b), (a), (c)); \
}
#else
typedef struct tcphdr tcphdr_t;
typedef struct udphdr udphdr_t;
typedef struct icmp icmphdr_t;
typedef struct ip ip_t;
#endif /* linux */
#endif /* __IP_COMPAT_H__ */

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/*
* (C)opyright 1993,1994,1995 by Darren Reed.
*
* Redistribution and use in source and binary forms are permitted
* provided that this notice is preserved and due credit is given
* to the original author and the contributors.
*/
#if !defined(lint) && defined(LIBC_SCCS)
static char sccsid[] = "@(#)ip_fil.c 2.41 6/5/96 (C) 1993-1995 Darren Reed";
static char rcsid[] = "$Id: ip_fil.c,v 2.0.1.5 1997/01/29 13:41:45 darrenr Exp $";
#endif
#include <sys/errno.h>
#include <sys/types.h>
#include <sys/param.h>
#include <sys/file.h>
#include <sys/ioctl.h>
#include <sys/systm.h>
#include <sys/uio.h>
#include <sys/mbuf.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <net/if.h>
#ifdef sun
#include <net/af.h>
#endif
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/ip_var.h>
#include <netinet/tcp.h>
#include <netinet/udp.h>
#include <netinet/tcpip.h>
#include <netinet/ip_icmp.h>
#include <syslog.h>
#include "ip_fil.h"
#include "ip_compat.h"
#include "ip_frag.h"
#include "ip_nat.h"
#include "ip_state.h"
#ifndef MIN
#define MIN(a,b) (((a)<(b))?(a):(b))
#endif
extern fr_flags, fr_active;
extern struct protosw inetsw[];
extern int (*fr_checkp)();
#if BSD < 199306
extern int ipfr_slowtimer();
static int (*fr_saveslowtimo)();
extern int tcp_ttl;
#else
extern void ipfr_slowtimer();
static void (*fr_saveslowtimo)();
#endif
int ipl_inited = 0;
int ipl_unreach = ICMP_UNREACH_FILTER;
int send_reset();
#ifdef IPFILTER_LOG
# define LOGSIZE 8192
int ipllog();
char iplbuf[LOGSIZE];
caddr_t iplh = iplbuf, iplt = iplbuf;
static int iplused = 0;
#endif /* IPFILTER_LOG */
static void frflush();
static int frrequest();
static int (*fr_savep)();
#if _BSDI_VERSION >= 199501
# include <sys/device.h>
# include <sys/conf.h>
int iplioctl __P((dev_t, int, caddr_t, int, struct proc *));
int iplopen __P((dev_t, int, int, struct proc *));
int iplclose __P((dev_t, int, int, struct proc *));
# ifdef IPFILTER_LOG
int iplread __P((dev_t, struct uio *, int));
# else
# define iplread noread
# endif
int iplioctl __P((dev_t, int, caddr_t, int, struct proc *));
struct cfdriver iplcd = {
NULL, "ipl", NULL, NULL, DV_DULL, 0
};
struct devsw iplsw = {
&iplcd,
iplopen, iplclose, iplread, nowrite, iplioctl, noselect, nommap,
nostrat, nodump, nopsize, 0,
nostop
};
#endif /* _BSDI_VERSION >= 199501 */
#ifdef IPFILTER_LKM
int iplidentify(s)
char *s;
{
if (strcmp(s, "ipl") == 0)
return 1;
return 0;
}
#endif /* IPFILTER_LKM */
int iplattach()
{
int s;
SPLNET(s);
if (ipl_inited || (fr_checkp == fr_check)) {
printf("IP Filter: already initialized\n");
SPLX(s);
return EBUSY;
}
ipl_inited = 1;
bzero((char *)nat_table, sizeof(nat_t *) * NAT_SIZE * 2);
fr_savep = fr_checkp;
fr_checkp = fr_check;
fr_saveslowtimo = inetsw[0].pr_slowtimo;
inetsw[0].pr_slowtimo = ipfr_slowtimer;
SPLX(s);
return 0;
}
int ipldetach()
{
int s, i = FR_INQUE|FR_OUTQUE;
SPLNET(s);
if (!ipl_inited)
{
printf("IP Filter: not initialized\n");
SPLX(s);
return EBUSY;
}
fr_checkp = fr_savep;
inetsw[0].pr_slowtimo = fr_saveslowtimo;
frflush((caddr_t)&i);
ipl_inited = 0;
ipfr_unload();
ip_natunload();
fr_stateunload();
SPLX(s);
return 0;
}
static void frzerostats(data)
caddr_t data;
{
struct friostat fio;
bcopy((char *)frstats, (char *)fio.f_st,
sizeof(struct filterstats) * 2);
fio.f_fin[0] = ipfilter[0][0];
fio.f_fin[1] = ipfilter[0][1];
fio.f_fout[0] = ipfilter[1][0];
fio.f_fout[1] = ipfilter[1][1];
fio.f_acctin[0] = ipacct[0][0];
fio.f_acctin[1] = ipacct[0][1];
fio.f_acctout[0] = ipacct[1][0];
fio.f_acctout[1] = ipacct[1][1];
fio.f_active = fr_active;
IWCOPY((caddr_t)&fio, data, sizeof(fio));
bzero((char *)frstats, sizeof(*frstats) * 2);
}
static void frflush(data)
caddr_t data;
{
struct frentry *f, **fp;
int flags = *(int *)data, flushed = 0, set = fr_active;
bzero((char *)frcache, sizeof(frcache[0]) * 2);
if (flags & FR_INACTIVE)
set = 1 - set;
if (flags & FR_OUTQUE) {
for (fp = &ipfilter[1][set]; (f = *fp); ) {
*fp = f->fr_next;
KFREE(f);
flushed++;
}
for (fp = &ipacct[1][set]; (f = *fp); ) {
*fp = f->fr_next;
KFREE(f);
flushed++;
}
}
if (flags & FR_INQUE) {
for (fp = &ipfilter[0][set]; (f = *fp); ) {
*fp = f->fr_next;
KFREE(f);
flushed++;
}
for (fp = &ipacct[0][set]; (f = *fp); ) {
*fp = f->fr_next;
KFREE(f);
flushed++;
}
}
*(int *)data = flushed;
}
/*
* Filter ioctl interface.
*/
int iplioctl(dev, cmd, data, mode
#if _BSDI_VERSION >= 199501
, p)
struct proc *p;
#else
)
#endif
dev_t dev;
int cmd;
caddr_t data;
int mode;
{
int error = 0, s, unit;
unit = minor(dev);
if (unit != 0)
return ENXIO;
SPLNET(s);
switch (cmd) {
case FIONREAD :
#ifdef IPFILTER_LOG
*(int *)data = iplused;
#endif
break;
#ifndef IPFILTER_LKM
case SIOCFRENB :
{
u_int enable;
if (!(mode & FWRITE))
error = EPERM;
else {
IRCOPY(data, (caddr_t)&enable, sizeof(enable));
if (enable)
error = iplattach();
else
error = ipldetach();
}
break;
}
#endif
case SIOCSETFF :
if (!(mode & FWRITE))
error = EPERM;
else
IRCOPY(data, (caddr_t)&fr_flags, sizeof(fr_flags));
break;
case SIOCGETFF :
IWCOPY((caddr_t)&fr_flags, data, sizeof(fr_flags));
break;
case SIOCINAFR :
case SIOCRMAFR :
case SIOCADAFR :
case SIOCZRLST :
if (!(mode & FWRITE))
error = EPERM;
else
error = frrequest(cmd, data, fr_active);
break;
case SIOCINIFR :
case SIOCRMIFR :
case SIOCADIFR :
if (!(mode & FWRITE))
error = EPERM;
else
error = frrequest(cmd, data, 1 - fr_active);
break;
case SIOCSWAPA :
if (!(mode & FWRITE))
error = EPERM;
else {
bzero((char *)frcache, sizeof(frcache[0]) * 2);
*(u_int *)data = fr_active;
fr_active = 1 - fr_active;
}
break;
case SIOCGETFS :
{
struct friostat fio;
bcopy((char *)frstats, (char *)fio.f_st,
sizeof(struct filterstats) * 2);
fio.f_fin[0] = ipfilter[0][0];
fio.f_fin[1] = ipfilter[0][1];
fio.f_fout[0] = ipfilter[1][0];
fio.f_fout[1] = ipfilter[1][1];
fio.f_acctin[0] = ipacct[0][0];
fio.f_acctin[1] = ipacct[0][1];
fio.f_acctout[0] = ipacct[1][0];
fio.f_acctout[1] = ipacct[1][1];
fio.f_active = fr_active;
IWCOPY((caddr_t)&fio, data, sizeof(fio));
break;
}
case SIOCFRZST :
if (!(mode & FWRITE))
error = EPERM;
else
frzerostats(data);
break;
case SIOCIPFFL :
if (!(mode & FWRITE))
error = EPERM;
else
frflush(data);
break;
#ifdef IPFILTER_LOG
case SIOCIPFFB :
if (!(mode & FWRITE))
error = EPERM;
else {
*(int *)data = iplused;
iplh = iplt = iplbuf;
iplused = 0;
}
break;
#endif /* IPFILTER_LOG */
case SIOCADNAT :
case SIOCRMNAT :
case SIOCGNATS :
case SIOCGNATL :
case SIOCFLNAT :
case SIOCCNATL :
error = nat_ioctl(data, cmd, mode);
break;
case SIOCGFRST :
IWCOPY((caddr_t)ipfr_fragstats(), data, sizeof(ipfrstat_t));
break;
case SIOCGIPST :
IWCOPY((caddr_t)fr_statetstats(), data, sizeof(ips_stat_t));
break;
default :
error = EINVAL;
break;
}
SPLX(s);
return error;
}
static int frrequest(req, data, set)
int req, set;
caddr_t data;
{
register frentry_t *fp, *f, **fprev;
register frentry_t **ftail;
frentry_t fr;
frdest_t *fdp;
struct frentry frd;
int error = 0, in;
fp = &fr;
IRCOPY(data, (caddr_t)fp, sizeof(*fp));
bzero((char *)frcache, sizeof(frcache[0]) * 2);
in = (fp->fr_flags & FR_INQUE) ? 0 : 1;
if (fp->fr_flags & FR_ACCOUNT) {
ftail = fprev = &ipacct[in][set];
} else if (fp->fr_flags & (FR_OUTQUE|FR_INQUE))
ftail = fprev = &ipfilter[in][set];
else
return ESRCH;
IRCOPY((char *)fp, (char *)&frd, sizeof(frd));
fp = &frd;
if (*fp->fr_ifname) {
fp->fr_ifa = GETUNIT(fp->fr_ifname);
if (!fp->fr_ifa)
fp->fr_ifa = (struct ifnet *)-1;
}
fdp = &fp->fr_dif;
fp->fr_flags &= ~FR_DUP;
if (*fdp->fd_ifname) {
fdp->fd_ifp = GETUNIT(fdp->fd_ifname);
if (!fdp->fd_ifp)
fdp->fd_ifp = (struct ifnet *)-1;
else
fp->fr_flags |= FR_DUP;
}
fdp = &fp->fr_tif;
if (*fdp->fd_ifname) {
fdp->fd_ifp = GETUNIT(fdp->fd_ifname);
if (!fdp->fd_ifp)
fdp->fd_ifp = (struct ifnet *)-1;
}
/*
* Look for a matching filter rule, but don't include the next or
* interface pointer in the comparison (fr_next, fr_ifa).
*/
for (; (f = *ftail); ftail = &f->fr_next)
if (bcmp((char *)&f->fr_ip, (char *)&fp->fr_ip,
FR_CMPSIZ) == 0)
break;
/*
* If zero'ing statistics, copy current to caller and zero.
*/
if (req == SIOCZRLST) {
if (!f)
return ESRCH;
IWCOPY((caddr_t)f, data, sizeof(*f));
f->fr_hits = 0;
f->fr_bytes = 0;
return 0;
}
if (!f) {
ftail = fprev;
if (req != SIOCINAFR && req != SIOCINIFR)
while ((f = *ftail))
ftail = &f->fr_next;
else if (fp->fr_hits)
while (--fp->fr_hits && (f = *ftail))
ftail = &f->fr_next;
f = NULL;
}
if (req == SIOCDELFR || req == SIOCRMIFR) {
if (!f)
error = ESRCH;
else {
*ftail = f->fr_next;
(void) KFREE(f);
}
} else {
if (f)
error = EEXIST;
else {
if ((f = (struct frentry *)KMALLOC(sizeof(*f)))) {
bcopy((char *)fp, (char *)f, sizeof(*f));
f->fr_hits = 0;
f->fr_next = *ftail;
*ftail = f;
} else
error = ENOMEM;
}
}
return (error);
}
#if !defined(linux)
/*
* routines below for saving IP headers to buffer
*/
int iplopen(dev, flags
#if _BSDI_VERSION >= 199501
, devtype, p)
int devtype;
struct proc *p;
#else
)
#endif
dev_t dev;
int flags;
{
u_int min = minor(dev);
if (min)
min = ENXIO;
return min;
}
int iplclose(dev, flags
#if _BSDI_VERSION >= 199501
, devtype, p)
int devtype;
struct proc *p;
#else
)
#endif
dev_t dev;
int flags;
{
u_int min = minor(dev);
if (min)
min = ENXIO;
return min;
}
# ifdef IPFILTER_LOG
/*
* iplread/ipllog
* both of these must operate with at least splnet() lest they be
* called during packet processing and cause an inconsistancy to appear in
* the filter lists.
*/
# if BSD >= 199306
int iplread(dev, uio, ioflag)
int ioflag;
# else
int iplread(dev, uio)
# endif
dev_t dev;
register struct uio *uio;
{
register int ret, s;
register size_t sz, sx;
int error;
if (!uio->uio_resid)
return 0;
while (!iplused) {
error = SLEEP(iplbuf, "ipl sleep");
if (error)
return error;
}
SPLNET(s);
sx = sz = MIN(uio->uio_resid, iplused);
if (iplh < iplt)
sz = MIN(sz, LOGSIZE - (iplt - iplbuf));
sx -= sz;
# if BSD >= 199306 || defined(__FreeBSD__)
uio->uio_rw = UIO_READ;
# endif
if (!(ret = UIOMOVE(iplt, sz, UIO_READ, uio))) {
iplt += sz;
iplused -= sz;
if ((iplh < iplt) && (iplt == iplbuf + LOGSIZE))
iplt = iplbuf;
if (sx && !(ret = UIOMOVE(iplt, sx, UIO_READ, uio))) {
iplt += sx;
iplused -= sx;
if ((iplh < iplt) && (iplt == iplbuf + LOGSIZE))
iplt = iplbuf;
}
if (!iplused) /* minimise wrapping around the end */
iplh = iplt = iplbuf;
}
SPLX(s);
return ret;
}
# endif /* IPFILTER_LOG */
#endif /* linux */
#ifdef IPFILTER_LOG
int ipllog(flags, ip, fin, m)
u_int flags;
ip_t *ip;
register fr_info_t *fin;
struct mbuf *m;
{
struct ipl_ci iplci;
register int len, mlen, hlen;
struct ifnet *ifp = fin->fin_ifp;
hlen = fin->fin_hlen;
if (ip->ip_p == IPPROTO_TCP || ip->ip_p == IPPROTO_UDP)
hlen += MIN(sizeof(tcphdr_t), fin->fin_dlen);
else if (ip->ip_p == IPPROTO_ICMP) {
struct icmp *icmp = (struct icmp *)((char *)ip + hlen);
switch (icmp->icmp_type) {
case ICMP_UNREACH :
case ICMP_SOURCEQUENCH :
case ICMP_REDIRECT :
case ICMP_TIMXCEED :
case ICMP_PARAMPROB :
hlen += MIN(sizeof(struct icmp) + 8, fin->fin_dlen);
break;
default :
hlen += MIN(sizeof(struct icmp), fin->fin_dlen);
break;
}
}
mlen = (flags & FR_LOGBODY) ? MIN(ip->ip_len - hlen, 128) : 0;
len = hlen + sizeof(iplci) + mlen;
if (iplused + len > LOGSIZE)
return 0;
iplused += len;
# ifdef sun
uniqtime(&iplci);
# endif
# if BSD >= 199306 || defined(__FreeBSD__)
microtime((struct timeval *)&iplci);
# endif
iplci.flags = flags;
iplci.hlen = (u_char)hlen;
iplci.plen = (u_char)mlen;
iplci.rule = fin->fin_rule;
# if (defined(NetBSD) && (NetBSD <= 1991011) && (NetBSD >= 199603))
strncpy(iplci.ifname, ifp->if_xname, IFNAMSIZ);
# else
iplci.unit = (u_char)ifp->if_unit;
if ((iplci.ifname[0] = ifp->if_name[0]))
if ((iplci.ifname[1] = ifp->if_name[1]))
if ((iplci.ifname[2] = ifp->if_name[2]))
iplci.ifname[3] = ifp->if_name[3];
# endif
/*
* Gauranteed to succeed from above
*/
(void) fr_copytolog(&iplci, sizeof(iplci));
for (len -= sizeof(iplci); m && len > 0; m = m->m_next, len -= hlen) {
hlen = MIN(len, m->m_len);
if (fr_copytolog(mtod(m, char *), hlen))
break;
}
wakeup(iplbuf);
return 1;
}
#endif /* IPFILTER_LOG */
/*
* send_reset - this could conceivably be a call to tcp_respond(), but that
* requires a large amount of setting up and isn't any more efficient.
*/
int send_reset(ti)
struct tcpiphdr *ti;
{
struct tcpiphdr *tp;
struct ip *ip;
struct tcphdr *tcp;
struct mbuf *m;
int tlen = 0;
if (ti->ti_flags & TH_RST)
return -1; /* feedback loop */
#if BSD < 199306
m = m_get(M_DONTWAIT, MT_HEADER);
#else
m = m_gethdr(M_DONTWAIT, MT_HEADER);
m->m_data += max_linkhdr;
#endif
if (m == NULL)
return -1;
if (ti->ti_flags & TH_SYN)
tlen = 1;
m->m_len = sizeof (struct tcpiphdr);
#if BSD >= 199306
m->m_pkthdr.len = sizeof (struct tcpiphdr);
m->m_pkthdr.rcvif = (struct ifnet *)0;
#endif
bzero(mtod(m, char *), sizeof(struct tcpiphdr));
ip = mtod(m, struct ip *);
tp = mtod(m, struct tcpiphdr *);
tcp = (struct tcphdr *)((char *)ip + sizeof(struct ip));
ip->ip_src.s_addr = ti->ti_dst.s_addr;
ip->ip_dst.s_addr = ti->ti_src.s_addr;
tcp->th_dport = ti->ti_sport;
tcp->th_sport = ti->ti_dport;
tcp->th_ack = htonl(ntohl(ti->ti_seq) + tlen);
tcp->th_off = sizeof(struct tcphdr) >> 2;
tcp->th_flags = TH_RST|TH_ACK;
tp->ti_pr = ((struct ip *)ti)->ip_p;
tp->ti_len = htons(sizeof(struct tcphdr));
tcp->th_sum = in_cksum(m, sizeof(struct tcpiphdr));
ip->ip_tos = ((struct ip *)ti)->ip_tos;
ip->ip_p = ((struct ip *)ti)->ip_p;
ip->ip_len = sizeof (struct tcpiphdr);
#if BSD < 199306
ip->ip_ttl = tcp_ttl;
#else
ip->ip_ttl = ip_defttl;
#endif
/*
* extra 0 in case of multicast
*/
(void) ip_output(m, (struct mbuf *)0, 0, 0, 0);
return 0;
}
#ifndef IPFILTER_LKM
void iplinit()
{
(void) iplattach();
ip_init();
}
#endif
void ipfr_fastroute(m0, fin, fdp)
struct mbuf *m0;
fr_info_t *fin;
frdest_t *fdp;
{
register struct ip *ip, *mhip;
register struct mbuf *m = m0;
register struct route *ro;
struct ifnet *ifp = fdp->fd_ifp;
int len, off, error = 0;
int hlen = fin->fin_hlen;
struct route iproute;
struct sockaddr_in *dst;
ip = mtod(m0, struct ip *);
/*
* Route packet.
*/
ro = &iproute;
bzero((caddr_t)ro, sizeof (*ro));
dst = (struct sockaddr_in *)&ro->ro_dst;
dst->sin_family = AF_INET;
dst->sin_addr = fdp->fd_ip.s_addr ? fdp->fd_ip : ip->ip_dst;
#if (BSD >= 199306) && !defined(__NetBSD__) && !defined(__bsdi__)
# ifdef RTF_CLONING
rtalloc_ign(ro, RTF_CLONING);
# else
rtalloc_ign(ro, RTF_PRCLONING);
# endif
#else
rtalloc(ro);
#endif
if (!ifp) {
if (!(fin->fin_fr->fr_flags & FR_FASTROUTE)) {
error = -2;
goto bad;
}
if (ro->ro_rt == 0 || (ifp = ro->ro_rt->rt_ifp) == 0) {
if (in_localaddr(ip->ip_dst))
error = EHOSTUNREACH;
else
error = ENETUNREACH;
goto bad;
}
if (ro->ro_rt->rt_flags & RTF_GATEWAY)
dst = (struct sockaddr_in *)&ro->ro_rt->rt_gateway;
}
ro->ro_rt->rt_use++;
/*
* For input packets which are being "fastrouted", they won't
* go back through output filtering and miss their chance to get
* NAT'd.
*/
(void) ip_natout(ip, hlen, fin);
if (fin->fin_out)
ip->ip_sum = 0;
/*
* If small enough for interface, can just send directly.
*/
if (ip->ip_len <= ifp->if_mtu) {
#ifndef sparc
ip->ip_id = htons(ip->ip_id);
ip->ip_len = htons(ip->ip_len);
ip->ip_off = htons(ip->ip_off);
#endif
if (!ip->ip_sum)
ip->ip_sum = in_cksum(m, hlen);
#if BSD >= 199306
error = (*ifp->if_output)(ifp, m, (struct sockaddr *)dst,
ro->ro_rt);
#else
error = (*ifp->if_output)(ifp, m, (struct sockaddr *)dst);
#endif
goto done;
}
/*
* Too large for interface; fragment if possible.
* Must be able to put at least 8 bytes per fragment.
*/
if (ip->ip_off & IP_DF) {
error = EMSGSIZE;
goto bad;
}
len = (ifp->if_mtu - hlen) &~ 7;
if (len < 8) {
error = EMSGSIZE;
goto bad;
}
{
int mhlen, firstlen = len;
struct mbuf **mnext = &m->m_act;
/*
* Loop through length of segment after first fragment,
* make new header and copy data of each part and link onto chain.
*/
m0 = m;
mhlen = sizeof (struct ip);
for (off = hlen + len; off < ip->ip_len; off += len) {
MGET(m, M_DONTWAIT, MT_HEADER);
if (m == 0) {
error = ENOBUFS;
goto bad;
}
#if BSD >= 199306
m->m_data += max_linkhdr;
#else
m->m_off = MMAXOFF - hlen;
#endif
mhip = mtod(m, struct ip *);
bcopy((char *)ip, (char *)mhip, sizeof(*ip));
if (hlen > sizeof (struct ip)) {
mhlen = ip_optcopy(ip, mhip) + sizeof (struct ip);
mhip->ip_hl = mhlen >> 2;
}
m->m_len = mhlen;
mhip->ip_off = ((off - hlen) >> 3) + (ip->ip_off & ~IP_MF);
if (ip->ip_off & IP_MF)
mhip->ip_off |= IP_MF;
if (off + len >= ip->ip_len)
len = ip->ip_len - off;
else
mhip->ip_off |= IP_MF;
mhip->ip_len = htons((u_short)(len + mhlen));
m->m_next = m_copy(m0, off, len);
if (m->m_next == 0) {
error = ENOBUFS; /* ??? */
goto sendorfree;
}
#ifndef sparc
mhip->ip_off = htons((u_short)mhip->ip_off);
#endif
mhip->ip_sum = 0;
mhip->ip_sum = in_cksum(m, mhlen);
*mnext = m;
mnext = &m->m_act;
}
/*
* Update first fragment by trimming what's been copied out
* and updating header, then send each fragment (in order).
*/
m_adj(m0, hlen + firstlen - ip->ip_len);
ip->ip_len = htons((u_short)(hlen + firstlen));
ip->ip_off = htons((u_short)(ip->ip_off | IP_MF));
ip->ip_sum = 0;
ip->ip_sum = in_cksum(m0, hlen);
sendorfree:
for (m = m0; m; m = m0) {
m0 = m->m_act;
m->m_act = 0;
if (error == 0)
#if BSD >= 199306
error = (*ifp->if_output)(ifp, m,
(struct sockaddr *)dst, ro->ro_rt);
#else
error = (*ifp->if_output)(ifp, m,
(struct sockaddr *)dst);
#endif
else
m_freem(m);
}
}
done:
if (ro->ro_rt) {
RTFREE(ro->ro_rt);
}
return;
bad:
m_freem(m);
goto done;
}

293
sys/netinet/ip_fil.h Normal file
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@ -0,0 +1,293 @@
/*
* (C)opyright 1993-1996 by Darren Reed.
*
* Redistribution and use in source and binary forms are permitted
* provided that this notice is preserved and due credit is given
* to the original author and the contributors.
*
* @(#)ip_fil.h 1.35 6/5/96
* $Id: ip_fil.h,v 2.0.1.2 1997/01/10 00:28:15 darrenr Exp $
*/
#ifndef __IP_FIL_H__
#define __IP_FIL_H__
#ifndef SOLARIS
#define SOLARIS (defined(sun) && (defined(__svr4__) || defined(__SVR4)))
#endif
#if defined(KERNEL) && !defined(_KERNEL)
#define _KERNEL
#endif
#if SOLARIS
# include <sys/ioccom.h>
# include <sys/sysmacros.h>
# ifdef _KERNEL
# include <inet/common.h>
/*
* because Solaris 2 defines these in two places :-/
*/
#undef IPOPT_EOL
#undef IPOPT_NOP
#undef IPOPT_LSRR
#undef IPOPT_RR
#undef IPOPT_SSRR
# include <inet/ip.h>
# endif
#endif
#if defined(__STDC__) || defined(__GNUC__)
#define SIOCADAFR _IOW('r', 60, struct frentry)
#define SIOCRMAFR _IOW('r', 61, struct frentry)
#define SIOCSETFF _IOW('r', 62, u_int)
#define SIOCGETFF _IOR('r', 63, u_int)
#define SIOCGETFS _IOR('r', 64, struct friostat)
#define SIOCIPFFL _IOWR('r', 65, int)
#define SIOCIPFFB _IOR('r', 66, int)
#define SIOCADIFR _IOW('r', 67, struct frentry)
#define SIOCRMIFR _IOW('r', 68, struct frentry)
#define SIOCSWAPA _IOR('r', 69, u_int)
#define SIOCINAFR _IOW('r', 70, struct frentry)
#define SIOCINIFR _IOW('r', 71, struct frentry)
#define SIOCFRENB _IOW('r', 72, u_int)
#define SIOCFRSYN _IOW('r', 73, u_int)
#define SIOCFRZST _IOWR('r', 74, struct friostat)
#define SIOCZRLST _IOWR('r', 75, struct frentry)
#else
#define SIOCADAFR _IOW(r, 60, struct frentry)
#define SIOCRMAFR _IOW(r, 61, struct frentry)
#define SIOCSETFF _IOW(r, 62, u_int)
#define SIOCGETFF _IOR(r, 63, u_int)
#define SIOCGETFS _IOR(r, 64, struct friostat)
#define SIOCIPFFL _IOWR(r, 65, int)
#define SIOCIPFFB _IOR(r, 66, int)
#define SIOCADIFR _IOW(r, 67, struct frentry)
#define SIOCRMIFR _IOW(r, 68, struct frentry)
#define SIOCSWAPA _IOR(r, 69, u_int)
#define SIOCINAFR _IOW(r, 70, struct frentry)
#define SIOCINIFR _IOW(r, 71, struct frentry)
#define SIOCFRENB _IOW(r, 72, u_int)
#define SIOCFRSYN _IOW(r, 73, u_int)
#define SIOCFRZST _IOWR(r, 74, struct friostat)
#define SIOCZRLST _IOWR(r, 75, struct frentry)
#endif
#define SIOCADDFR SIOCADAFR
#define SIOCDELFR SIOCRMAFR
#define SIOCINSFR SIOCINAFR
typedef struct fr_ip {
u_char fi_v:4; /* IP version */
u_char fi_fl:4; /* packet flags */
u_char fi_tos;
u_char fi_ttl;
u_char fi_p;
struct in_addr fi_src;
struct in_addr fi_dst;
u_long fi_optmsk; /* bitmask composed from IP options */
u_short fi_secmsk; /* bitmask composed from IP security options */
u_short fi_auth;
} fr_ip_t;
#define FI_OPTIONS 0x01
#define FI_TCPUDP 0x02 /* TCP/UCP implied comparison involved */
#define FI_FRAG 0x04
#define FI_SHORT 0x08
typedef struct fr_info {
struct fr_ip fin_fi;
void *fin_ifp;
u_short fin_data[2];
u_short fin_out;
u_char fin_tcpf;
u_char fin_icode;
u_short fin_rule;
u_short fin_hlen;
u_short fin_dlen;
char *fin_dp; /* start of data past IP header */
struct frentry *fin_fr;
} fr_info_t;
#define FI_CSIZE (sizeof(struct fr_ip) + 11)
typedef struct frdest {
void *fd_ifp;
struct in_addr fd_ip;
char fd_ifname[IFNAMSIZ];
} frdest_t;
typedef struct frentry {
struct frentry *fr_next;
struct ifnet *fr_ifa;
u_long fr_hits;
u_long fr_bytes; /* this is only incremented when a packet */
/* matches this rule and it is the last match*/
/*
* Fields after this may not change whilst in the kernel.
*/
struct fr_ip fr_ip;
struct fr_ip fr_mip; /* mask structure */
u_char fr_tcpfm; /* tcp flags mask */
u_char fr_tcpf; /* tcp flags */
u_short fr_icmpm; /* data for ICMP packets (mask) */
u_short fr_icmp;
u_char fr_scmp; /* data for port comparisons */
u_char fr_dcmp;
u_short fr_dport;
u_short fr_sport;
u_short fr_stop; /* top port for <> and >< */
u_short fr_dtop; /* top port for <> and >< */
u_long fr_flags; /* per-rule flags && options (see below) */
int (*fr_func)(); /* call this function */
char fr_icode; /* return ICMP code */
char fr_ifname[IFNAMSIZ];
struct frdest fr_tif; /* "to" interface */
struct frdest fr_dif; /* duplicate packet interfaces */
} frentry_t;
#define fr_proto fr_ip.fi_p
#define fr_ttl fr_ip.fi_ttl
#define fr_tos fr_ip.fi_tos
#define fr_dst fr_ip.fi_dst
#define fr_src fr_ip.fi_src
#define fr_dmsk fr_mip.fi_dst
#define fr_smsk fr_mip.fi_src
#ifndef offsetof
#define offsetof(t,m) (int)((&((t *)0L)->m))
#endif
#define FR_CMPSIZ (sizeof(struct frentry) - offsetof(frentry_t, fr_ip))
/*
* fr_flags
*/
#define FR_BLOCK 0x00001
#define FR_PASS 0x00002
#define FR_OUTQUE 0x00004
#define FR_INQUE 0x00008
#define FR_LOG 0x00010 /* Log */
#define FR_LOGB 0x00011 /* Log-fail */
#define FR_LOGP 0x00012 /* Log-pass */
#define FR_LOGBODY 0x00020 /* Log the body */
#define FR_LOGFIRST 0x00040 /* Log the first byte if state held */
#define FR_RETRST 0x00080 /* Return TCP RST packet - reset connection */
#define FR_RETICMP 0x00100 /* Return ICMP unreachable packet */
#define FR_NOMATCH 0x00200
#define FR_ACCOUNT 0x00400 /* count packet bytes */
#define FR_KEEPFRAG 0x00800 /* keep fragment information */
#define FR_KEEPSTATE 0x01000 /* keep `connection' state information */
#define FR_INACTIVE 0x02000
#define FR_QUICK 0x04000 /* match & stop processing list */
#define FR_FASTROUTE 0x08000 /* bypass normal routing */
#define FR_CALLNOW 0x10000 /* call another function (fr_func) if matches */
#define FR_DUP 0x20000 /* duplicate packet */
#define FR_LOGORBLOCK 0x40000 /* block the packet if it can't be logged */
#define FR_LOGMASK (FR_LOG|FR_LOGP|FR_LOGB)
/*
* recognized flags for SIOCGETFF and SIOCSETFF
*/
#define FF_LOGPASS 0x100000
#define FF_LOGBLOCK 0x200000
#define FF_LOGNOMATCH 0x400000
#define FF_LOGGING (FF_LOGPASS|FF_LOGBLOCK|FF_LOGNOMATCH)
#define FF_BLOCKNONIP 0x800000 /* Solaris2 Only */
#define FR_NONE 0
#define FR_EQUAL 1
#define FR_NEQUAL 2
#define FR_LESST 3
#define FR_GREATERT 4
#define FR_LESSTE 5
#define FR_GREATERTE 6
#define FR_OUTRANGE 7
#define FR_INRANGE 8
typedef struct filterstats {
u_long fr_pass; /* packets allowed */
u_long fr_block; /* packets denied */
u_long fr_nom; /* packets which don't match any rule */
u_long fr_ppkl; /* packets allowed and logged */
u_long fr_bpkl; /* packets denied and logged */
u_long fr_npkl; /* packets unmatched and logged */
u_long fr_pkl; /* packets logged */
u_long fr_skip; /* packets to be logged but buffer full */
u_long fr_ret; /* packets for which a return is sent */
u_long fr_acct; /* packets for which counting was performed */
u_long fr_bnfr; /* bad attempts to allocate fragment state */
u_long fr_nfr; /* new fragment state kept */
u_long fr_cfr; /* add new fragment state but complete pkt */
u_long fr_bads; /* bad attempts to allocate packet state */
u_long fr_ads; /* new packet state kept */
u_long fr_chit; /* cached hit */
u_long fr_pull[2]; /* good and bad pullup attempts */
#if SOLARIS
u_long fr_bad; /* bad IP packets to the filter */
u_long fr_notip; /* packets passed through no on ip queue */
u_long fr_drop; /* packets dropped - no info for them! */
#endif
} filterstats_t;
/*
* For SIOCGETFS
*/
typedef struct friostat {
struct filterstats f_st[2];
struct frentry *f_fin[2];
struct frentry *f_fout[2];
struct frentry *f_acctin[2];
struct frentry *f_acctout[2];
int f_active;
} friostat_t;
typedef struct optlist {
u_short ol_val;
int ol_bit;
} optlist_t;
/*
* Log structure. Each packet header logged is prepended by one of these,
* minimize size to make most effective use of log space which should
* (ideally) be a muliple of the most common log entry size.
*/
typedef struct ipl_ci {
u_long sec;
u_long usec;
u_char hlen;
u_char plen;
u_short rule; /* assume never more than 64k rules, total */
#if (defined(NetBSD) && (NetBSD <= 1991011) && (NetBSD >= 199603))
u_long flags;
u_char ifname[IFNAMSIZ]; /* = 32 bytes */
#else
u_long flags:24;
u_long unit:8;
u_char ifname[4]; /* = 20 bytes */
#endif
} ipl_ci_t;
#ifndef ICMP_UNREACH_FILTER
#define ICMP_UNREACH_FILTER 13
#endif
#define IPMINLEN(i, h) ((i)->ip_len >= ((i)->ip_hl * 4 + sizeof(struct h)))
#define IPLLOGSIZE 8192
extern int fr_check();
extern int fr_copytolog();
extern fr_info_t frcache[];
extern char *iplh, *iplt;
extern char iplbuf[IPLLOGSIZE];
#ifdef _KERNEL
extern struct frentry *ipfilter[2][2], *ipacct[2][2];
extern struct filterstats frstats[];
# if SOLARIS
extern int ipfsync();
# endif
#endif /* _KERNEL */
#endif /* __IP_FIL_H__ */

278
sys/netinet/ip_frag.c Normal file
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@ -0,0 +1,278 @@
/*
* (C)opyright 1993,1994,1995 by Darren Reed.
*
* Redistribution and use in source and binary forms are permitted
* provided that this notice is preserved and due credit is given
* to the original author and the contributors.
*/
#if !defined(lint) && defined(LIBC_SCCS)
static char sccsid[] = "@(#)ip_frag.c 1.11 3/24/96 (C) 1993-1995 Darren Reed";
static char rcsid[] = "$Id: ip_frag.c,v 2.0.1.1 1997/01/09 15:14:43 darrenr Exp $";
#endif
#if !defined(_KERNEL) && !defined(KERNEL)
# include <string.h>
# include <stdlib.h>
#endif
#include <sys/errno.h>
#include <sys/types.h>
#include <sys/param.h>
#include <sys/file.h>
#include <sys/ioctl.h>
#include <sys/uio.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#ifdef _KERNEL
# include <sys/systm.h>
#endif
#if !defined(__SVR4) && !defined(__svr4__)
# include <sys/mbuf.h>
#else
# include <sys/byteorder.h>
# include <sys/dditypes.h>
# include <sys/stream.h>
# include <sys/kmem.h>
#endif
#include <net/if.h>
#ifdef sun
#include <net/af.h>
#endif
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/ip_var.h>
#include <netinet/tcp.h>
#include <netinet/udp.h>
#include <netinet/tcpip.h>
#include <netinet/ip_icmp.h>
#include "ip_fil.h"
#include "ip_compat.h"
#include "ip_frag.h"
#include "ip_nat.h"
#include "ip_state.h"
ipfr_t *ipfr_heads[IPFT_SIZE];
ipfrstat_t ipfr_stats;
u_long ipfr_inuse = 0,
fr_ipfrttl = 120; /* 60 seconds */
#ifdef _KERNEL
extern int ipfr_timer_id;
#endif
#if SOLARIS
# ifdef _KERNEL
extern kmutex_t ipf_frag;
# else
#define bcmp(a,b,c) memcmp(a,b,c)
#define bcopy(a,b,c) memmove(b,a,c)
# endif
#endif
ipfrstat_t *ipfr_fragstats()
{
ipfr_stats.ifs_table = ipfr_heads;
ipfr_stats.ifs_inuse = ipfr_inuse;
return &ipfr_stats;
}
/*
* add a new entry to the fragment cache, registering it as having come
* through this box, with the result of the filter operation.
*/
int ipfr_newfrag(ip, fin, pass)
ip_t *ip;
fr_info_t *fin;
int pass;
{
ipfr_t **fp, *fr, frag;
u_int idx;
frag.ipfr_p = ip->ip_p;
idx = ip->ip_p;
frag.ipfr_id = ip->ip_id;
idx += ip->ip_id;
frag.ipfr_tos = ip->ip_tos;
frag.ipfr_src.s_addr = ip->ip_src.s_addr;
idx += ip->ip_src.s_addr;
frag.ipfr_dst.s_addr = ip->ip_dst.s_addr;
idx += ip->ip_dst.s_addr;
idx *= 127;
idx %= IPFT_SIZE;
/*
* first, make sure it isn't already there...
*/
MUTEX_ENTER(&ipf_frag);
for (fp = &ipfr_heads[idx]; (fr = *fp); fp = &fr->ipfr_next)
if (!bcmp((char *)&frag.ipfr_src, (char *)&fr->ipfr_src,
IPFR_CMPSZ)) {
ipfr_stats.ifs_exists++;
MUTEX_EXIT(&ipf_frag);
return -1;
}
if (!(fr = (ipfr_t *)KMALLOC(sizeof(*fr)))) {
ipfr_stats.ifs_nomem++;
MUTEX_EXIT(&ipf_frag);
return -1;
}
if ((fr->ipfr_next = ipfr_heads[idx]))
ipfr_heads[idx]->ipfr_prev = fr;
fr->ipfr_prev = NULL;
ipfr_heads[idx] = fr;
bcopy((char *)&frag.ipfr_src, (char *)&fr->ipfr_src, IPFR_CMPSZ);
fr->ipfr_ttl = fr_ipfrttl;
fr->ipfr_pass = pass & ~(FR_LOGFIRST|FR_LOG);
fr->ipfr_off = (ip->ip_off & 0x1fff) + (fin->fin_dlen >> 3);
*fp = fr;
ipfr_stats.ifs_new++;
ipfr_inuse++;
MUTEX_EXIT(&ipf_frag);
return 0;
}
/*
* check the fragment cache to see if there is already a record of this packet
* with its filter result known.
*/
int ipfr_knownfrag(ip, fin)
ip_t *ip;
fr_info_t *fin;
{
ipfr_t *f, frag;
u_int idx;
int ret;
/*
* For fragments, we record protocol, packet id, TOS and both IP#'s
* (these should all be the same for all fragments of a packet).
*/
frag.ipfr_p = ip->ip_p;
idx = ip->ip_p;
frag.ipfr_id = ip->ip_id;
idx += ip->ip_id;
frag.ipfr_tos = ip->ip_tos;
frag.ipfr_src.s_addr = ip->ip_src.s_addr;
idx += ip->ip_src.s_addr;
frag.ipfr_dst.s_addr = ip->ip_dst.s_addr;
idx += ip->ip_dst.s_addr;
idx *= 127;
idx %= IPFT_SIZE;
MUTEX_ENTER(&ipf_frag);
for (f = ipfr_heads[idx]; f; f = f->ipfr_next)
if (!bcmp((char *)&frag.ipfr_src, (char *)&f->ipfr_src,
IPFR_CMPSZ)) {
u_short atoff, off;
if (f != ipfr_heads[idx]) {
/*
* move fragment info. to the top of the list
* to speed up searches.
*/
if ((f->ipfr_prev->ipfr_next = f->ipfr_next))
f->ipfr_next->ipfr_prev = f->ipfr_prev;
f->ipfr_next = ipfr_heads[idx];
ipfr_heads[idx]->ipfr_prev = f;
f->ipfr_prev = NULL;
ipfr_heads[idx] = f;
}
ret = f->ipfr_pass;
off = ip->ip_off;
atoff = (off & 0x1fff) - (fin->fin_dlen >> 3);
/*
* If we've follwed the fragments, and this is the
* last (in order), shrink expiration time.
*/
if (atoff == f->ipfr_off) {
if (!(off & IP_MF))
f->ipfr_ttl = 1;
else
f->ipfr_off = off;
}
ipfr_stats.ifs_hits++;
MUTEX_EXIT(&ipf_frag);
return ret;
}
MUTEX_EXIT(&ipf_frag);
return 0;
}
/*
* Free memory in use by fragment state info. kept.
*/
void ipfr_unload()
{
ipfr_t **fp, *fr;
int idx;
#if !SOLARIS && defined(_KERNEL)
int s;
#endif
MUTEX_ENTER(&ipf_frag);
SPLNET(s);
for (idx = IPFT_SIZE - 1; idx >= 0; idx--)
for (fp = &ipfr_heads[idx]; (fr = *fp); ) {
*fp = fr->ipfr_next;
KFREE(fr);
}
SPLX(s);
MUTEX_EXIT(&ipf_frag);
}
#ifdef _KERNEL
/*
* Slowly expire held state for fragments. Timeouts are set * in expectation
* of this being called twice per second.
*/
# if BSD < 199306
int ipfr_slowtimer()
# else
void ipfr_slowtimer()
# endif
{
ipfr_t **fp, *fr;
int s, idx;
MUTEX_ENTER(&ipf_frag);
SPLNET(s);
for (idx = IPFT_SIZE - 1; idx >= 0; idx--)
for (fp = &ipfr_heads[idx]; (fr = *fp); ) {
--fr->ipfr_ttl;
if (fr->ipfr_ttl == 0) {
if (fr->ipfr_prev)
fr->ipfr_prev->ipfr_next =
fr->ipfr_next;
if (fr->ipfr_next)
fr->ipfr_next->ipfr_prev =
fr->ipfr_prev;
*fp = fr->ipfr_next;
ipfr_stats.ifs_expire++;
ipfr_inuse--;
KFREE(fr);
} else
fp = &fr->ipfr_next;
}
SPLX(s);
# if SOLARIS
MUTEX_EXIT(&ipf_frag);
fr_timeoutstate();
ip_natexpire();
ipfr_timer_id = timeout(ipfr_slowtimer, NULL, HZ/2);
# else
fr_timeoutstate();
ip_natexpire();
ip_slowtimo();
# if BSD < 199306
return 0;
# endif
# endif
}
#endif /* defined(_KERNEL) */

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sys/netinet/ip_frag.h Normal file
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/*
* (C)opyright 1993, 1994, 1995 by Darren Reed.
*
* Redistribution and use in source and binary forms are permitted
* provided that this notice is preserved and due credit is given
* to the original author and the contributors.
*
* @(#)ip_frag.h 1.5 3/24/96
* $Id: ip_frag.h,v 2.0.1.1 1997/01/09 15:14:43 darrenr Exp $
*/
#ifndef __IP_FRAG_H_
#define __IP_FRAG_H__
#define IPFT_SIZE 257
typedef struct ipfr {
struct ipfr *ipfr_next, *ipfr_prev;
struct in_addr ipfr_src;
struct in_addr ipfr_dst;
u_short ipfr_id;
u_char ipfr_p;
u_char ipfr_tos;
u_short ipfr_off;
u_short ipfr_ttl;
u_char ipfr_pass;
} ipfr_t;
typedef struct ipfrstat {
u_long ifs_exists; /* add & already exists */
u_long ifs_nomem;
u_long ifs_new;
u_long ifs_hits;
u_long ifs_expire;
u_long ifs_inuse;
struct ipfr **ifs_table;
} ipfrstat_t;
#define IPFR_CMPSZ (4 + 4 + 2 + 1 + 1)
extern ipfrstat_t *ipfr_fragstats();
extern int ipfr_newfrag(), ipfr_knownfrag();
# ifdef _KERNEL
extern void ipfr_unload();
# endif
#endif /* __IP_FIL_H__ */

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/*
* (C)opyright 1995-1996 by Darren Reed.
*
* Redistribution and use in source and binary forms are permitted
* provided that this notice is preserved and due credit is given
* to the original author and the contributors.
*
* Added redirect stuff and a LOT of bug fixes. (mcn@EnGarde.com)
*/
#if !defined(lint) && defined(LIBC_SCCS)
static char sccsid[] = "@(#)ip_nat.c 1.11 6/5/96 (C) 1995 Darren Reed";
static char rcsid[] = "$Id: ip_nat.c,v 2.0.1.10 1997/02/08 06:38:49 darrenr Exp $";
#endif
#if !defined(_KERNEL) && !defined(KERNEL)
# include <stdio.h>
# include <string.h>
# include <stdlib.h>
#endif
#include <sys/errno.h>
#include <sys/types.h>
#include <sys/param.h>
#include <sys/file.h>
#include <sys/ioctl.h>
#include <sys/uio.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#ifdef _KERNEL
# include <sys/systm.h>
#endif
#if !defined(__SVR4) && !defined(__svr4__)
# include <sys/mbuf.h>
#else
# include <sys/byteorder.h>
# include <sys/dditypes.h>
# include <sys/stream.h>
# include <sys/kmem.h>
#endif
#include <net/if.h>
#ifdef sun
#include <net/af.h>
#endif
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#ifdef RFC1825
#include <vpn/md5.h>
#include <vpn/ipsec.h>
extern struct ifnet vpnif;
#endif
#include <netinet/ip_var.h>
#include <netinet/tcp.h>
#include <netinet/udp.h>
#include <netinet/tcpip.h>
#include <netinet/ip_icmp.h>
#include "ip_fil.h"
#include "ip_compat.h"
#include "ip_nat.h"
#include "ip_state.h"
#ifndef MIN
#define MIN(a,b) (((a)<(b))?(a):(b))
#endif
nat_t *nat_table[2][NAT_SIZE], *nat_instances = NULL;
ipnat_t *nat_list = NULL;
u_long nat_inuse = 0,
fr_defnatage = 1200;
natstat_t nat_stats;
#if SOLARIS
# ifndef _KERNEL
#define bzero(a,b) memset(a,0,b)
#define bcmp(a,b,c) memcpy(a,b,c)
#define bcopy(a,b,c) memmove(b,a,c)
# else
extern kmutex_t ipf_nat;
# endif
#endif
static int flush_nattable(), clear_natlist();
static void nattable_sync();
void fix_outcksum(sp, n)
u_short *sp;
u_long n;
{
register u_short sumshort;
register u_long sum1;
#ifdef sparc
sum1 = (~(*sp)) & 0xffff;
#else
sum1 = (~ntohs(*sp)) & 0xffff;
#endif
sum1 += (n);
sum1 = (sum1 >> 16) + (sum1 & 0xffff);
/* Again */
sum1 = (sum1 >> 16) + (sum1 & 0xffff);
sumshort = ~(u_short)sum1;
*(sp) = htons(sumshort);
}
void fix_incksum(sp, n)
u_short *sp;
u_long n;
{
register u_short sumshort;
register u_long sum1;
#ifdef sparc
sum1 = (~(*sp)) & 0xffff;
#else
sum1 = (~ntohs(*sp)) & 0xffff;
#endif
sum1 += ~(n) & 0xffff;
sum1 = (sum1 >> 16) + (sum1 & 0xffff);
/* Again */
sum1 = (sum1 >> 16) + (sum1 & 0xffff);
sumshort = ~(u_short)sum1;
*(sp) = htons(sumshort);
}
/*
* How the NAT is organised and works.
*
* Inside (interface y) NAT Outside (interface x)
* -------------------- -+- -------------------------------------
* Packet going | out, processsed by ip_natout() for x
* ------------> | ------------>
* src=10.1.1.1 | src=192.1.1.1
* |
* | in, processed by ip_natin() for x
* <------------ | <------------
* dst=10.1.1.1 | dst=192.1.1.1
* -------------------- -+- -------------------------------------
* ip_natout() - changes ip_src and if required, sport
* - creates a new mapping, if required.
* ip_natin() - changes ip_dst and if required, dport
*
* In the NAT table, internal source is recorded as "in" and externally
* seen as "out".
*/
/*
* Handle ioctls which manipulate the NAT.
*/
int nat_ioctl(data, cmd, mode)
caddr_t data;
int cmd, mode;
{
register ipnat_t *nat, *n = NULL, **np = NULL;
ipnat_t natd;
int error = 0, ret;
/*
* For add/delete, look to see if the NAT entry is already present
*/
MUTEX_ENTER(&ipf_nat);
if ((cmd == SIOCADNAT) || (cmd == SIOCRMNAT)) {
IRCOPY(data, (char *)&natd, sizeof(natd));
nat = &natd;
for (np = &nat_list; (n = *np); np = &n->in_next)
if (!bcmp((char *)&nat->in_flags, (char *)&n->in_flags,
IPN_CMPSIZ))
break;
}
switch (cmd)
{
case SIOCADNAT :
if (!(mode & FWRITE)) {
error = EPERM;
break;
}
if (n) {
error = EEXIST;
break;
}
if (!(n = (ipnat_t *)KMALLOC(sizeof(*n)))) {
error = ENOMEM;
break;
}
IRCOPY((char *)data, (char *)n, sizeof(*n));
n->in_ifp = (void *)GETUNIT(n->in_ifname);
n->in_next = *np;
n->in_use = 0;
n->in_space = ~(0xffffffff & ntohl(n->in_outmsk));
if (n->in_space) /* lose 2: broadcast + network address */
n->in_space -= 2;
else
n->in_space = 1; /* single IP# mapping */
if (n->in_outmsk != 0xffffffff)
n->in_nip = ntohl(n->in_outip) + 1;
else
n->in_nip = ntohl(n->in_outip);
if (n->in_redir == NAT_MAP) {
n->in_pnext = ntohs(n->in_pmin);
/*
* Multiply by the number of ports made available.
*/
if (ntohs(n->in_pmax) > ntohs(n->in_pmin))
n->in_space *= (ntohs(n->in_pmax) -
ntohs(n->in_pmin));
}
/* Otherwise, these fields are preset */
*np = n;
break;
case SIOCRMNAT :
if (!(mode & FWRITE)) {
error = EPERM;
break;
}
if (!n) {
error = ESRCH;
break;
}
*np = n->in_next;
KFREE(n);
nattable_sync();
break;
case SIOCGNATS :
nat_stats.ns_table[0] = nat_table[0];
nat_stats.ns_table[1] = nat_table[1];
nat_stats.ns_list = nat_list;
nat_stats.ns_inuse = nat_inuse;
IWCOPY((char *)&nat_stats, (char *)data, sizeof(nat_stats));
break;
case SIOCGNATL :
{
natlookup_t nl;
IRCOPY((char *)data, (char *)&nl, sizeof(nl));
if (nat_lookupredir(&nl))
IWCOPY((char *)&nl, (char *)data, sizeof(nl));
else
error = ESRCH;
break;
}
case SIOCFLNAT :
if (!(mode & FWRITE)) {
error = EPERM;
break;
}
ret = flush_nattable();
IWCOPY((caddr_t)&ret, data, sizeof(ret));
break;
case SIOCCNATL :
if (!(mode & FWRITE)) {
error = EPERM;
break;
}
ret = clear_natlist();
IWCOPY((caddr_t)&ret, data, sizeof(ret));
break;
}
MUTEX_EXIT(&ipf_nat);
return error;
}
static void nat_delete(natd)
struct nat *natd;
{
register struct nat **natp, *nat;
for (natp = natd->nat_hstart[0]; (nat = *natp);
natp = &nat->nat_hnext[0])
if (nat == natd) {
*natp = nat->nat_hnext[0];
break;
}
for (natp = natd->nat_hstart[1]; (nat = *natp);
natp = &nat->nat_hnext[1])
if (nat == natd) {
*natp = nat->nat_hnext[1];
break;
}
if (natd->nat_ptr) {
natd->nat_ptr->in_space++;
natd->nat_ptr->in_use--;
}
KFREE(natd);
nat_inuse--;
}
/*
* flush_nattable - clear the NAT table of all mapping entries.
*/
static int flush_nattable()
{
register nat_t *nat, **natp;
register int j = 0;
/*
* Everything will be deleted, so lets just make it the deletions
* quicker.
*/
bzero((char *)nat_table[0], sizeof(nat_table[0]));
bzero((char *)nat_table[1], sizeof(nat_table[1]));
for (natp = &nat_instances; (nat = *natp); ) {
*natp = nat->nat_next;
nat_delete(nat);
j++;
}
return j;
}
/*
* I know this is O(N*M), but it can't be avoided.
*/
static void nattable_sync()
{
register nat_t *nat;
register ipnat_t *np;
int i;
for (i = NAT_SIZE - 1; i >= 0; i--)
for (nat = nat_instances; nat; nat = nat->nat_next) {
for (np = nat_list; np; np = np->in_next)
if (nat->nat_ptr == np)
break;
/*
* XXX - is it better to remove this if ? works the
* same if it is just "nat->nat_ptr = np".
*/
if (!np)
nat->nat_ptr = NULL;
}
}
/*
* clear_natlist - delete all entries in the active NAT mapping list.
*/
static int clear_natlist()
{
register ipnat_t *n, **np;
int i = 0;
for (np = &nat_list; (n = *np); i++) {
*np = n->in_next;
KFREE(n);
}
nattable_sync();
return i;
}
/*
* Create a new NAT table entry.
*/
nat_t *nat_new(np, ip, fin, flags, direction)
ipnat_t *np;
ip_t *ip;
fr_info_t *fin;
u_short flags;
int direction;
{
register u_long sum1, sum2, sumd;
u_short port = 0, sport = 0, dport = 0, nport = 0;
struct in_addr in;
tcphdr_t *tcp = NULL;
nat_t *nat, **natp;
u_short nflags;
nflags = flags & np->in_flags;
if (flags & IPN_TCPUDP) {
tcp = (tcphdr_t *)fin->fin_dp;
sport = tcp->th_sport;
dport = tcp->th_dport;
}
/* Give me a new nat */
if (!(nat = (nat_t *)KMALLOC(sizeof(*nat))))
return NULL;
bzero((char *)nat, sizeof(*nat));
/*
* Search the current table for a match.
*/
if (direction == NAT_OUTBOUND) {
/*
* If it's an outbound packet which doesn't match any existing
* record, then create a new port
*/
do {
port = 0;
in.s_addr = np->in_nip;
if (nflags & IPN_TCPUDP) {
port = htons(np->in_pnext++);
if (np->in_pnext >= ntohs(np->in_pmax)) {
np->in_pnext = ntohs(np->in_pmin);
np->in_space--;
if (np->in_outmsk != 0xffffffff)
np->in_nip++;
}
} else if (np->in_outmsk != 0xffffffff) {
np->in_space--;
np->in_nip++;
}
if (!port && (flags & IPN_TCPUDP))
port = sport;
if ((np->in_nip & ntohl(np->in_outmsk)) >
ntohl(np->in_outip))
np->in_nip = ntohl(np->in_outip) + 1;
} while (nat_inlookup(flags, ip->ip_dst, dport, in, port));
/* Setup the NAT table */
nat->nat_inip = ip->ip_src;
nat->nat_outip.s_addr = htonl(in.s_addr);
nat->nat_oip = ip->ip_dst;
sum1 = (ntohl(ip->ip_src.s_addr) & 0xffff) +
(ntohl(ip->ip_src.s_addr) >> 16) + ntohs(sport);
sum2 = (in.s_addr & 0xffff) + (in.s_addr >> 16) + ntohs(port);
if (flags & IPN_TCPUDP) {
nat->nat_inport = sport;
nat->nat_outport = port;
nat->nat_oport = dport;
}
} else {
/*
* Otherwise, it's an inbound packet. Most likely, we don't
* want to rewrite source ports and source addresses. Instead,
* we want to rewrite to a fixed internal address and fixed
* internal port.
*/
in.s_addr = ntohl(np->in_inip);
if (!(nport = np->in_pnext))
nport = dport;
nat->nat_inip.s_addr = htonl(in.s_addr);
nat->nat_outip = ip->ip_dst;
nat->nat_oip = ip->ip_src;
sum1 = (ntohl(ip->ip_dst.s_addr) & 0xffff) +
(ntohl(ip->ip_dst.s_addr) >> 16) + ntohs(dport);
sum2 = (in.s_addr & 0xffff) + (in.s_addr >> 16) + ntohs(nport);
if (flags & IPN_TCPUDP) {
nat->nat_inport = nport;
nat->nat_outport = dport;
nat->nat_oport = sport;
}
}
/* Do it twice */
sum1 = (sum1 & 0xffff) + (sum1 >> 16);
sum1 = (sum1 & 0xffff) + (sum1 >> 16);
/* Do it twice */
sum2 = (sum2 & 0xffff) + (sum2 >> 16);
sum2 = (sum2 & 0xffff) + (sum2 >> 16);
if (sum1 > sum2)
sum2--; /* Because ~1 == -2, We really need ~1 == -1 */
sumd = sum2 - sum1;
sumd = (sumd & 0xffff) + (sumd >> 16);
nat->nat_sumd = (sumd & 0xffff) + (sumd >> 16);
if ((flags & IPN_TCPUDP) && ((sport != port) || (dport != nport))) {
if (direction == NAT_OUTBOUND)
sum1 = (ntohl(ip->ip_src.s_addr) & 0xffff) +
(ntohl(ip->ip_src.s_addr) >> 16);
else
sum1 = (ntohl(ip->ip_dst.s_addr) & 0xffff) +
(ntohl(ip->ip_dst.s_addr) >> 16);
sum2 = (in.s_addr & 0xffff) + (in.s_addr >> 16);
/* Do it twice */
sum1 = (sum1 & 0xffff) + (sum1 >> 16);
sum1 = (sum1 & 0xffff) + (sum1 >> 16);
/* Do it twice */
sum2 = (sum2 & 0xffff) + (sum2 >> 16);
sum2 = (sum2 & 0xffff) + (sum2 >> 16);
if (sum1 > sum2)
sum2--; /* Because ~1 == -2, We really need ~1 == -1 */
sumd = sum2 - sum1;
sumd = (sumd & 0xffff) + (sumd >> 16);
nat->nat_ipsumd = (sumd & 0xffff) + (sumd >> 16);
} else
nat->nat_ipsumd = nat->nat_sumd;
in.s_addr = htonl(in.s_addr);
nat->nat_next = nat_instances;
nat_instances = nat;
natp = &nat_table[0][nat->nat_inip.s_addr % NAT_SIZE];
nat->nat_hstart[0] = natp;
nat->nat_hnext[0] = *natp;
*natp = nat;
natp = &nat_table[1][nat->nat_outip.s_addr % NAT_SIZE];
nat->nat_hstart[1] = natp;
nat->nat_hnext[1] = *natp;
*natp = nat;
nat->nat_ptr = np;
np->in_use++;
if (direction == NAT_OUTBOUND) {
if (flags & IPN_TCPUDP)
tcp->th_sport = htons(port);
} else {
if (flags & IPN_TCPUDP)
tcp->th_dport = htons(nport);
}
nat_stats.ns_added++;
nat_inuse++;
return nat;
}
/*
* NB: these lookups don't lock access to the list, it assume it has already
* been done!
*/
/*
* Lookup a nat entry based on the mapped destination ip address/port and
* real source address/port. We use this lookup when receiving a packet,
* we're looking for a table entry, based on the destination address.
* NOTE: THE PACKET BEING CHECKED (IF FOUND) HAS A MAPPING ALREADY.
*/
nat_t *nat_inlookup(flags, src, sport, mapdst, mapdport)
register int flags;
struct in_addr src , mapdst;
u_short sport, mapdport;
{
register nat_t *nat;
flags &= IPN_TCPUDP;
nat = nat_table[1][mapdst.s_addr % NAT_SIZE];
for (; nat; nat = nat->nat_hnext[1])
if (nat->nat_oip.s_addr == src.s_addr &&
nat->nat_outip.s_addr == mapdst.s_addr &&
(!flags || (nat->nat_oport == sport &&
nat->nat_outport == mapdport)))
return nat;
return NULL;
}
/*
* Lookup a nat entry based on the source 'real' ip address/port and
* destination address/port. We use this lookup when sending a packet out,
* we're looking for a table entry, based on the source address.
* NOTE: THE PACKET BEING CHECKED (IF FOUND) HAS A MAPPING ALREADY.
*/
nat_t *nat_outlookup(flags, src, sport, dst, dport)
register int flags;
struct in_addr src , dst;
u_short sport, dport;
{
register nat_t *nat;
flags &= IPN_TCPUDP;
nat = nat_table[0][src.s_addr % NAT_SIZE];
for (; nat; nat = nat->nat_hnext[0])
if (nat->nat_inip.s_addr == src.s_addr &&
nat->nat_oip.s_addr == dst.s_addr &&
(!flags || (nat->nat_inport == sport &&
nat->nat_oport == dport)))
return nat;
return NULL;
}
/*
* Lookup a nat entry based on the mapped source ip address/port and
* real destination address/port. We use this lookup when sending a packet
* out, we're looking for a table entry, based on the source address.
*/
nat_t *nat_lookupmapip(flags, mapsrc, mapsport, dst, dport)
register int flags;
struct in_addr mapsrc , dst;
u_short mapsport, dport;
{
register nat_t *nat;
flags &= IPN_TCPUDP;
nat = nat_table[1][mapsrc.s_addr % NAT_SIZE];
for (; nat; nat = nat->nat_hnext[0])
if (nat->nat_outip.s_addr == mapsrc.s_addr &&
nat->nat_oip.s_addr == dst.s_addr &&
(!flags || (nat->nat_outport == mapsport &&
nat->nat_oport == dport)))
return nat;
return NULL;
}
/*
* Lookup the NAT tables to search for a matching redirect
*/
nat_t *nat_lookupredir(np)
register natlookup_t *np;
{
nat_t *nat;
/*
* If nl_inip is non null, this is a lookup based on the real
* ip address. Else, we use the fake.
*/
if ((nat = nat_outlookup(IPN_TCPUDP, np->nl_inip, np->nl_inport,
np->nl_outip, np->nl_outport))) {
np->nl_inip = nat->nat_outip;
np->nl_inport = nat->nat_outport;
}
return nat;
}
/*
* Packets going out on the external interface go through this.
* Here, the source address requires alteration, if anything.
*/
int ip_natout(ip, hlen, fin)
ip_t *ip;
int hlen;
fr_info_t *fin;
{
register ipnat_t *np;
register u_long ipa;
tcphdr_t *tcp = NULL;
nat_t *nat;
u_short nflags = 0, sport = 0, dport = 0, *csump = NULL;
struct ifnet *ifp;
frentry_t *fr;
if ((fr = fin->fin_fr) && !(fr->fr_flags & FR_DUP) &&
fr->fr_tif.fd_ifp && fr->fr_tif.fd_ifp != (void *)-1)
ifp = fr->fr_tif.fd_ifp;
else
ifp = fin->fin_ifp;
if (!(ip->ip_off & 0x1fff) && !(fin->fin_fi.fi_fl & FI_SHORT)) {
if (ip->ip_p == IPPROTO_TCP)
nflags = IPN_TCP;
else if (ip->ip_p == IPPROTO_UDP)
nflags = IPN_UDP;
if (nflags) {
tcp = (tcphdr_t *)fin->fin_dp;
sport = tcp->th_sport;
dport = tcp->th_dport;
}
}
ipa = ip->ip_src.s_addr;
MUTEX_ENTER(&ipf_nat);
for (np = nat_list; np; np = np->in_next)
if ((np->in_ifp == ifp) && np->in_space &&
(!np->in_flags || (np->in_flags & nflags)) &&
((ipa & np->in_inmsk) == np->in_inip) &&
((np->in_redir == NAT_MAP) ||
(np->in_pnext == sport))) {
/*
* If there is no current entry in the nat table for
* this IP#, create one for it.
*/
if (!(nat = nat_outlookup(nflags, ip->ip_src, sport,
ip->ip_dst, dport))) {
if (np->in_redir == NAT_REDIRECT)
continue;
/*
* if it's a redirection, then we don't want
* to create new outgoing port stuff.
* Redirections are only for incoming
* connections.
*/
if (!(nat = nat_new(np, ip, fin, nflags,
NAT_OUTBOUND)))
break;
}
ip->ip_src = nat->nat_outip;
nat->nat_age = fr_defnatage; /* 5 mins */
/*
* Fix up checksums, not by recalculating them, but
* simply computing adjustments.
*/
#if SOLARIS
if (np->in_redir == NAT_MAP)
fix_outcksum(&ip->ip_sum, nat->nat_ipsumd);
else
fix_incksum(&ip->ip_sum, nat->nat_ipsumd);
#endif
if (nflags && !(ip->ip_off & 0x1fff) &&
!(fin->fin_fi.fi_fl & FI_SHORT)) {
if (nat->nat_outport)
tcp->th_sport = nat->nat_outport;
if (ip->ip_p == IPPROTO_TCP) {
csump = &tcp->th_sum;
set_tcp_age(&nat->nat_age,
nat->nat_state, ip, fin,1);
} else if (ip->ip_p == IPPROTO_UDP) {
udphdr_t *udp = (udphdr_t *)tcp;
if (udp->uh_sum)
csump = &udp->uh_sum;
} else if (ip->ip_p == IPPROTO_ICMP) {
icmphdr_t *ic = (icmphdr_t *)tcp;
csump = &ic->icmp_cksum;
}
if (csump) {
if (np->in_redir == NAT_MAP)
fix_outcksum(csump,
nat->nat_sumd);
else
fix_incksum(csump,
nat->nat_sumd);
}
}
nat_stats.ns_mapped[1]++;
MUTEX_EXIT(&ipf_nat);
return 1;
}
MUTEX_EXIT(&ipf_nat);
return 0;
}
/*
* Packets coming in from the external interface go through this.
* Here, the destination address requires alteration, if anything.
*/
int ip_natin(ip, hlen, fin)
ip_t *ip;
int hlen;
fr_info_t *fin;
{
register ipnat_t *np;
register struct in_addr in;
struct ifnet *ifp = fin->fin_ifp;
tcphdr_t *tcp = NULL;
u_short sport = 0, dport = 0, nflags = 0, *csump = NULL;
nat_t *nat;
if (!(ip->ip_off & 0x1fff) && !(fin->fin_fi.fi_fl & FI_SHORT)) {
if (ip->ip_p == IPPROTO_TCP)
nflags = IPN_TCP;
else if (ip->ip_p == IPPROTO_UDP)
nflags = IPN_UDP;
if (nflags) {
tcp = (tcphdr_t *)((char *)ip + hlen);
dport = tcp->th_dport;
sport = tcp->th_sport;
}
}
in = ip->ip_dst;
MUTEX_ENTER(&ipf_nat);
for (np = nat_list; np; np = np->in_next)
if ((np->in_ifp == ifp) &&
(!np->in_flags || (nflags & np->in_flags)) &&
((in.s_addr & np->in_outmsk) == np->in_outip) &&
(np->in_redir == NAT_MAP || np->in_pmin == dport)) {
if (!(nat = nat_inlookup(nflags, ip->ip_src, sport,
ip->ip_dst, dport))) {
if (np->in_redir == NAT_MAP)
continue;
else {
/*
* If this rule (np) is a redirection,
* rather than a mapping, then do a
* nat_new. Otherwise, if it's just a
* mapping, do a continue;
*/
if (!(nat = nat_new(np, ip, fin,
nflags,
NAT_INBOUND)))
break;
}
}
ip->ip_dst = nat->nat_inip;
nat->nat_age = fr_defnatage;
/*
* Fix up checksums, not by recalculating them, but
* simply computing adjustments.
*/
#if SOLARIS
if (np->in_redir == NAT_MAP)
fix_incksum(&ip->ip_sum, nat->nat_ipsumd);
else
fix_outcksum(&ip->ip_sum, nat->nat_ipsumd);
#endif
if (nflags && !(ip->ip_off & 0x1fff) &&
!(fin->fin_fi.fi_fl & FI_SHORT)) {
if (nat->nat_inport)
tcp->th_dport = nat->nat_inport;
if (ip->ip_p == IPPROTO_TCP) {
csump = &tcp->th_sum;
set_tcp_age(&nat->nat_age,
nat->nat_state, ip, fin,0);
} else if (ip->ip_p == IPPROTO_UDP) {
udphdr_t *udp = (udphdr_t *)tcp;
if (udp->uh_sum)
csump = &udp->uh_sum;
} else if (ip->ip_p == IPPROTO_ICMP) {
icmphdr_t *ic = (icmphdr_t *)tcp;
csump = &ic->icmp_cksum;
}
if (csump) {
if (np->in_redir == NAT_MAP)
fix_incksum(csump,
nat->nat_sumd);
else
fix_outcksum(csump,
nat->nat_sumd);
}
}
nat_stats.ns_mapped[0]++;
MUTEX_EXIT(&ipf_nat);
return 1;
}
MUTEX_EXIT(&ipf_nat);
return 0;
}
/*
* Free all memory used by NAT structures allocated at runtime.
*/
void ip_natunload()
{
MUTEX_ENTER(&ipf_nat);
(void) clear_natlist();
(void) flush_nattable();
MUTEX_EXIT(&ipf_nat);
}
/*
* Slowly expire held state for NAT entries. Timeouts are set in
* expectation of this being called twice per second.
*/
void ip_natexpire()
{
register struct nat *nat, **natp;
MUTEX_ENTER(&ipf_nat);
for (natp = &nat_instances; (nat = *natp); natp = &nat->nat_next) {
if (--nat->nat_age)
continue;
*natp = nat->nat_next;
nat_delete(nat);
nat_stats.ns_expire++;
}
MUTEX_EXIT(&ipf_nat);
}

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sys/netinet/ip_nat.h Normal file
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/*
* (C)opyright 1995 by Darren Reed.
*
* Redistribution and use in source and binary forms are permitted
* provided that this notice is preserved and due credit is given
* to the original author and the contributors.
*
* @(#)ip_nat.h 1.5 2/4/96
* $Id: ip_nat.h,v 2.0.1.7 1997/01/30 12:39:41 darrenr Exp $
*/
#ifndef __IP_NAT_H_
#define __IP_NAT_H__
#ifndef SOLARIS
#define SOLARIS (defined(sun) && (defined(__svr4__) || defined(__SVR4)))
#endif
#if defined(__STDC__) || defined(__GNUC__)
#define SIOCADNAT _IOW('r', 80, struct ipnat)
#define SIOCRMNAT _IOW('r', 81, struct ipnat)
#define SIOCGNATS _IOR('r', 82, struct natstat)
#define SIOCGNATL _IOWR('r', 83, struct natlookup)
#define SIOCGFRST _IOR('r', 84, struct ipfrstat)
#define SIOCGIPST _IOR('r', 85, struct ips_stat)
#define SIOCFLNAT _IOWR('r', 86, int)
#define SIOCCNATL _IOWR('r', 87, int)
#else
#define SIOCADNAT _IOW(r, 80, struct ipnat)
#define SIOCRMNAT _IOW(r, 81, struct ipnat)
#define SIOCGNATS _IOR(r, 82, struct natstat)
#define SIOCGNATL _IOWR(r, 83, struct natlookup)
#define SIOCGFRST _IOR(r, 84, struct ipfrstat)
#define SIOCGIPST _IOR(r, 85, struct ips_stat)
#define SIOCFLNAT _IOWR(r, 86, int)
#define SIOCCNATL _IOWR(r, 87, int)
#endif
#define NAT_SIZE 367
typedef struct nat {
int nat_age;
u_long nat_sumd;
u_long nat_ipsumd;
struct in_addr nat_inip;
struct in_addr nat_outip;
struct in_addr nat_oip; /* other ip */
u_short nat_oport; /* other port */
u_short nat_inport;
u_short nat_outport;
u_short nat_use;
u_char nat_state[2];
struct ipnat *nat_ptr;
struct nat *nat_next;
struct nat *nat_hnext[2];
struct nat **nat_hstart[2];
} nat_t;
typedef struct ipnat {
struct ipnat *in_next;
void *in_ifp;
u_int in_space;
u_int in_use;
struct in_addr in_nextip;
u_short in_pnext;
u_short in_flags;
u_short in_port[2];
struct in_addr in_in[2];
struct in_addr in_out[2];
int in_redir; /* 0 if it's a mapping, 1 if it's a hard redir */
char in_ifname[IFNAMSIZ];
} ipnat_t;
#define in_pmin in_port[0] /* Also holds static redir port */
#define in_pmax in_port[1]
#define in_nip in_nextip.s_addr
#define in_inip in_in[0].s_addr
#define in_inmsk in_in[1].s_addr
#define in_outip in_out[0].s_addr
#define in_outmsk in_out[1].s_addr
#define NAT_INBOUND 0
#define NAT_OUTBOUND 1
#define NAT_MAP 0
#define NAT_REDIRECT 1
#define IPN_CMPSIZ (sizeof(struct in_addr) * 4 + sizeof(u_short) * 3 + \
sizeof(int))
typedef struct natlookup {
struct in_addr nl_inip;
struct in_addr nl_outip;
u_short nl_inport;
u_short nl_outport;
} natlookup_t;
typedef struct natstat {
u_long ns_mapped[2];
u_long ns_added;
u_long ns_expire;
u_long ns_inuse;
nat_t **ns_table[2];
ipnat_t *ns_list;
} natstat_t;
#define IPN_ANY 0
#define IPN_TCP 1
#define IPN_UDP 2
#define IPN_TCPUDP 3
extern nat_t *nat_table[2][NAT_SIZE];
extern int nat_ioctl();
extern nat_t *nat_outlookup(), *nat_inlookup(), *nat_lookupredir();
extern int ip_natout(), ip_natin();
extern void ip_natunload(), ip_natexpire();
#endif /* __IP_NAT_H__ */

536
sys/netinet/ip_state.c Normal file
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/*
* (C)opyright 1995 by Darren Reed.
*
* Redistribution and use in source and binary forms are permitted
* provided that this notice is preserved and due credit is given
* to the original author and the contributors.
*/
#if !defined(lint) && defined(LIBC_SCCS)
static char sccsid[] = "@(#)ip_state.c 1.8 6/5/96 (C) 1993-1995 Darren Reed";
static char rcsid[] = "$Id: ip_state.c,v 2.0.1.2 1997/01/09 15:22:45 darrenr Exp $";
#endif
#if !defined(_KERNEL) && !defined(KERNEL)
# include <stdlib.h>
# include <string.h>
#endif
#include <sys/errno.h>
#include <sys/types.h>
#include <sys/param.h>
#include <sys/file.h>
#include <sys/ioctl.h>
#include <sys/uio.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#ifdef _KERNEL
# include <sys/systm.h>
#endif
#if !defined(__SVR4) && !defined(__svr4__)
# include <sys/mbuf.h>
#else
# include <sys/byteorder.h>
# include <sys/dditypes.h>
# include <sys/stream.h>
# include <sys/kmem.h>
#endif
#include <net/if.h>
#ifdef sun
#include <net/af.h>
#endif
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/ip_var.h>
#include <netinet/tcp.h>
#include <netinet/tcp_fsm.h>
#include <netinet/udp.h>
#include <netinet/tcpip.h>
#include <netinet/ip_icmp.h>
#include "ip_fil.h"
#include "ip_compat.h"
#include "ip_state.h"
#ifndef MIN
#define MIN(a,b) (((a)<(b))?(a):(b))
#endif
void set_tcp_age();
#define TCP_CLOSE (TH_FIN|TH_RST)
ipstate_t *ips_table[IPSTATE_SIZE];
int ips_num = 0;
ips_stat_t ips_stats;
#if SOLARIS
extern kmutex_t ipf_state;
# if !defined(_KERNEL)
#define bcopy(a,b,c) memmove(b,a,c)
# endif
#endif
#define FIVE_DAYS (2 * 5 * 86400) /* 5 days: half closed session */
u_long fr_tcpidletimeout = FIVE_DAYS,
fr_tcpclosewait = 60,
fr_tcplastack = 20,
fr_tcptimeout = 120,
fr_tcpclosed = 1,
fr_udptimeout = 120,
fr_icmptimeout = 120;
ips_stat_t *fr_statetstats()
{
ips_stats.iss_active = ips_num;
ips_stats.iss_table = ips_table;
return &ips_stats;
}
#define PAIRS(s1,d1,s2,d2) ((((s1) == (s2)) && ((d1) == (d2))) ||\
(((s1) == (d2)) && ((d1) == (s2))))
#define IPPAIR(s1,d1,s2,d2) PAIRS((s1).s_addr, (d1).s_addr, \
(s2).s_addr, (d2).s_addr)
/*
* Create a new ipstate structure and hang it off the hash table.
*/
int fr_addstate(ip, fin, pass)
ip_t *ip;
fr_info_t *fin;
u_int pass;
{
ipstate_t ips;
register ipstate_t *is = &ips;
register u_int hv;
if ((ip->ip_off & 0x1fff) || (fin->fin_fi.fi_fl & FI_SHORT))
return -1;
if (ips_num == IPSTATE_MAX) {
ips_stats.iss_max++;
return -1;
}
ips.is_age = 1;
ips.is_state[0] = 0;
ips.is_state[1] = 0;
/*
* Copy and calculate...
*/
hv = (is->is_p = ip->ip_p);
hv += (is->is_src.s_addr = ip->ip_src.s_addr);
hv += (is->is_dst.s_addr = ip->ip_dst.s_addr);
switch (ip->ip_p)
{
case IPPROTO_ICMP :
{
struct icmp *ic = (struct icmp *)fin->fin_dp;
switch (ic->icmp_type)
{
case ICMP_ECHO :
is->is_icmp.ics_type = 0;
hv += (is->is_icmp.ics_id = ic->icmp_id);
hv += (is->is_icmp.ics_seq = ic->icmp_seq);
break;
case ICMP_TSTAMP :
case ICMP_IREQ :
case ICMP_MASKREQ :
is->is_icmp.ics_type = ic->icmp_type + 1;
break;
default :
return -1;
}
ips_stats.iss_icmp++;
is->is_age = fr_icmptimeout;
break;
}
case IPPROTO_TCP :
{
register tcphdr_t *tcp = (tcphdr_t *)fin->fin_dp;
/*
* The endian of the ports doesn't matter, but the ack and
* sequence numbers do as we do mathematics on them later.
*/
hv += (is->is_dport = tcp->th_dport);
hv += (is->is_sport = tcp->th_sport);
is->is_seq = ntohl(tcp->th_seq);
is->is_ack = ntohl(tcp->th_ack);
is->is_swin = ntohs(tcp->th_win);
is->is_dwin = is->is_swin; /* start them the same */
ips_stats.iss_tcp++;
/*
* If we're creating state for a starting connectoin, start the
* timer on it as we'll never see an error if it fails to
* connect.
*/
if ((tcp->th_flags & (TH_SYN|TH_ACK)) == TH_SYN)
is->is_ack = 0; /* Trumpet WinSock 'ism */
set_tcp_age(&is->is_age, is->is_state, ip, fin,
tcp->th_sport == is->is_sport);
break;
}
case IPPROTO_UDP :
{
register tcphdr_t *tcp = (tcphdr_t *)fin->fin_dp;
hv += (is->is_dport = tcp->th_dport);
hv += (is->is_sport = tcp->th_sport);
ips_stats.iss_udp++;
is->is_age = fr_udptimeout;
break;
}
default :
return -1;
}
if (!(is = (ipstate_t *)KMALLOC(sizeof(*is)))) {
ips_stats.iss_nomem++;
return -1;
}
bcopy((char *)&ips, (char *)is, sizeof(*is));
hv %= IPSTATE_SIZE;
MUTEX_ENTER(&ipf_state);
is->is_next = ips_table[hv];
ips_table[hv] = is;
is->is_pass = pass;
if (pass & FR_LOGFIRST)
is->is_pass &= ~(FR_LOGFIRST|FR_LOG);
ips_num++;
MUTEX_EXIT(&ipf_state);
return 0;
}
/*
* check to see if a packet with TCP headers fits within the TCP window.
* change timeout depending on whether new packet is a SYN-ACK returning for a
* SYN or a RST or FIN which indicate time to close up shop.
*/
int fr_tcpstate(is, fin, ip, tcp, sport
#ifndef _KERNEL
,isp)
ipstate_t **isp;
#else
)
#endif
register ipstate_t *is;
fr_info_t *fin;
ip_t *ip;
tcphdr_t *tcp;
u_short sport;
{
register int seqskew, ackskew;
register u_short swin, dwin;
register tcp_seq seq, ack;
int source;
/*
* Find difference between last checked packet and this packet.
*/
seq = ntohl(tcp->th_seq);
ack = ntohl(tcp->th_ack);
if (sport == is->is_sport) {
seqskew = seq - is->is_seq;
ackskew = ack - is->is_ack;
} else {
seqskew = ack - is->is_seq;
if (!is->is_ack)
/*
* Must be a SYN-ACK in reply to a SYN.
*/
is->is_ack = seq;
ackskew = seq - is->is_ack;
}
/*
* Make skew values absolute
*/
if (seqskew < 0)
seqskew = -seqskew;
if (ackskew < 0)
ackskew = -ackskew;
/*
* If the difference in sequence and ack numbers is within the
* window size of the connection, store these values and match
* the packet.
*/
if ((source = (sport == is->is_sport))) {
swin = is->is_swin;
dwin = is->is_dwin;
} else {
dwin = is->is_swin;
swin = is->is_dwin;
}
if ((seqskew <= swin) && (ackskew <= dwin)) {
if (source) {
is->is_seq = seq;
is->is_ack = ack;
is->is_swin = ntohs(tcp->th_win);
} else {
is->is_seq = ack;
is->is_ack = seq;
is->is_dwin = ntohs(tcp->th_win);
}
ips_stats.iss_hits++;
/*
* Nearing end of connection, start timeout.
*/
set_tcp_age(&is->is_age, is->is_state, ip, fin,
tcp->th_sport == is->is_sport);
return 1;
}
return 0;
}
/*
* Check if a packet has a registered state.
*/
int fr_checkstate(ip, fin)
ip_t *ip;
fr_info_t *fin;
{
register struct in_addr dst, src;
register ipstate_t *is, **isp;
register u_char pr;
struct icmp *ic;
tcphdr_t *tcp;
u_int hv, hlen;
if ((ip->ip_off & 0x1fff) || (fin->fin_fi.fi_fl & FI_SHORT))
return 0;
hlen = fin->fin_hlen;
tcp = (tcphdr_t *)((char *)ip + hlen);
ic = (struct icmp *)tcp;
hv = (pr = ip->ip_p);
hv += (src.s_addr = ip->ip_src.s_addr);
hv += (dst.s_addr = ip->ip_dst.s_addr);
/*
* Search the hash table for matching packet header info.
*/
switch (ip->ip_p)
{
case IPPROTO_ICMP :
hv += ic->icmp_id;
hv += ic->icmp_seq;
hv %= IPSTATE_SIZE;
MUTEX_ENTER(&ipf_state);
for (isp = &ips_table[hv]; (is = *isp); isp = &is->is_next)
if ((is->is_p == pr) &&
(ic->icmp_id == is->is_icmp.ics_id) &&
(ic->icmp_seq == is->is_icmp.ics_seq) &&
IPPAIR(src, dst, is->is_src, is->is_dst)) {
/*
* If we have type 0 stored, allow any icmp
* replies through.
*/
if (is->is_icmp.ics_type &&
is->is_icmp.ics_type != ic->icmp_type)
continue;
is->is_age = fr_icmptimeout;
ips_stats.iss_hits++;
MUTEX_EXIT(&ipf_state);
return is->is_pass;
}
MUTEX_EXIT(&ipf_state);
break;
case IPPROTO_TCP :
{
register u_short dport = tcp->th_dport, sport = tcp->th_sport;
hv += dport;
hv += sport;
hv %= IPSTATE_SIZE;
MUTEX_ENTER(&ipf_state);
for (isp = &ips_table[hv]; (is = *isp); isp = &is->is_next) {
if ((is->is_p == pr) &&
PAIRS(sport, dport, is->is_sport, is->is_dport) &&
IPPAIR(src, dst, is->is_src, is->is_dst))
if (fr_tcpstate(is, fin, ip, tcp, sport)) {
#ifdef _KERNEL
MUTEX_EXIT(&ipf_state);
return is->is_pass;
#else
int pass = is->is_pass;
if (tcp->th_flags & TCP_CLOSE) {
*isp = is->is_next;
isp = &ips_table[hv];
KFREE(is);
}
return pass;
#endif
}
}
MUTEX_EXIT(&ipf_state);
break;
}
case IPPROTO_UDP :
{
register u_short dport = tcp->th_dport, sport = tcp->th_sport;
hv += dport;
hv += sport;
hv %= IPSTATE_SIZE;
/*
* Nothing else to match on but ports. and IP#'s
*/
MUTEX_ENTER(&ipf_state);
for (is = ips_table[hv]; is; is = is->is_next)
if ((is->is_p == pr) &&
PAIRS(sport, dport, is->is_sport, is->is_dport) &&
IPPAIR(src, dst, is->is_src, is->is_dst)) {
ips_stats.iss_hits++;
is->is_age = fr_udptimeout;
MUTEX_EXIT(&ipf_state);
return is->is_pass;
}
MUTEX_EXIT(&ipf_state);
break;
}
default :
break;
}
ips_stats.iss_miss++;
return 0;
}
/*
* Free memory in use by all state info. kept.
*/
void fr_stateunload()
{
register int i;
register ipstate_t *is, **isp;
MUTEX_ENTER(&ipf_state);
for (i = 0; i < IPSTATE_SIZE; i++)
for (isp = &ips_table[i]; (is = *isp); ) {
*isp = is->is_next;
KFREE(is);
}
MUTEX_EXIT(&ipf_state);
}
/*
* Slowly expire held state for thingslike UDP and ICMP. Timeouts are set
* in expectation of this being called twice per second.
*/
void fr_timeoutstate()
{
register int i;
register ipstate_t *is, **isp;
MUTEX_ENTER(&ipf_state);
for (i = 0; i < IPSTATE_SIZE; i++)
for (isp = &ips_table[i]; (is = *isp); )
if (is->is_age && !--is->is_age) {
*isp = is->is_next;
if (is->is_p == IPPROTO_TCP)
ips_stats.iss_fin++;
else
ips_stats.iss_expire++;
KFREE(is);
ips_num--;
} else
isp = &is->is_next;
MUTEX_EXIT(&ipf_state);
}
/*
* Original idea freom Pradeep Krishnan for use primarily with NAT code.
* (pkrishna@netcom.com)
*/
void set_tcp_age(age, state, ip, fin, dir)
int *age;
u_char *state;
ip_t *ip;
fr_info_t *fin;
int dir;
{
tcphdr_t *tcp = (tcphdr_t *)fin->fin_dp;
u_char flags = tcp->th_flags;
int dlen, ostate;
ostate = state[1 - dir];
dlen = ip->ip_len - fin->fin_hlen - (tcp->th_off << 2);
if (flags & TH_RST) {
if (!(tcp->th_flags & TH_PUSH) && !dlen) {
*age = fr_tcpclosed;
state[dir] = TCPS_CLOSED;
} else {
*age = fr_tcpclosewait;
state[dir] = TCPS_CLOSE_WAIT;
}
return;
}
*age = fr_tcptimeout; /* 1 min */
switch(state[dir])
{
case TCPS_FIN_WAIT_2:
case TCPS_CLOSED:
if ((flags & TH_OPENING) == TH_OPENING)
state[dir] = TCPS_SYN_RECEIVED;
else if (flags & TH_SYN)
state[dir] = TCPS_SYN_SENT;
break;
case TCPS_SYN_RECEIVED:
if ((flags & (TH_FIN|TH_ACK)) == TH_ACK) {
state[dir] = TCPS_ESTABLISHED;
*age = fr_tcpidletimeout;
}
break;
case TCPS_SYN_SENT:
if ((flags & (TH_FIN|TH_ACK)) == TH_ACK) {
state[dir] = TCPS_ESTABLISHED;
*age = fr_tcpidletimeout;
}
break;
case TCPS_ESTABLISHED:
if (flags & TH_FIN) {
state[dir] = TCPS_CLOSE_WAIT;
if (!(flags & TH_PUSH) && !dlen &&
ostate > TCPS_ESTABLISHED)
*age = fr_tcplastack;
else
*age = fr_tcpclosewait;
} else
*age = fr_tcpidletimeout;
break;
case TCPS_CLOSE_WAIT:
if ((flags & TH_FIN) && !(flags & TH_PUSH) && !dlen &&
ostate > TCPS_ESTABLISHED) {
*age = fr_tcplastack;
state[dir] = TCPS_LAST_ACK;
} else
*age = fr_tcpclosewait;
break;
case TCPS_LAST_ACK:
if (flags & TH_ACK) {
state[dir] = TCPS_FIN_WAIT_2;
if (!(flags & TH_PUSH) && !dlen &&
ostate > TCPS_ESTABLISHED)
*age = fr_tcplastack;
else {
*age = fr_tcpclosewait;
state[dir] = TCPS_CLOSE_WAIT;
}
}
break;
}
}

86
sys/netinet/ip_state.h Normal file
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@ -0,0 +1,86 @@
/*
* (C)opyright 1995 by Darren Reed.
*
* Redistribution and use in source and binary forms are permitted
* provided that this notice is preserved and due credit is given
* to the original author and the contributors.
*
* @(#)ip_state.h 1.3 1/12/96 (C) 1995 Darren Reed
* $Id: ip_state.h,v 2.0.1.1 1997/01/09 15:14:43 darrenr Exp $
*/
#ifndef __IP_STATE_H__
#define __IP_STATE_H__
#define IPSTATE_SIZE 257
#define IPSTATE_MAX 2048 /* Maximum number of states held */
typedef struct udpstate {
u_short us_sport;
u_short us_dport;
} udpstate_t;
typedef struct icmpstate {
u_short ics_id;
u_short ics_seq;
u_char ics_type;
} icmpstate_t;
typedef struct tcpstate {
u_short ts_sport;
u_short ts_dport;
u_long ts_seq;
u_long ts_ack;
u_short ts_swin;
u_short ts_dwin;
u_char ts_state[2];
} tcpstate_t;
typedef struct ipstate {
struct ipstate *is_next;
int is_age;
u_int is_pass;
struct in_addr is_src;
struct in_addr is_dst;
u_char is_p;
u_char is_flags;
union {
icmpstate_t is_ics;
tcpstate_t is_ts;
udpstate_t is_us;
} is_ps;
} ipstate_t;
#define is_icmp is_ps.is_ics
#define is_tcp is_ps.is_ts
#define is_udp is_ps.is_us
#define is_seq is_tcp.ts_seq
#define is_ack is_tcp.ts_ack
#define is_dwin is_tcp.ts_dwin
#define is_swin is_tcp.ts_swin
#define is_sport is_tcp.ts_sport
#define is_dport is_tcp.ts_dport
#define is_state is_tcp.ts_state
#define TH_OPENING (TH_SYN|TH_ACK)
typedef struct ips_stat {
u_long iss_hits;
u_long iss_miss;
u_long iss_max;
u_long iss_tcp;
u_long iss_udp;
u_long iss_icmp;
u_long iss_nomem;
u_long iss_expire;
u_long iss_fin;
u_long iss_active;
ipstate_t **iss_table;
} ips_stat_t;
extern ips_stat_t *fr_statetstats();
extern int fr_addstate(), fr_checkstate();
extern void fr_timeoutstate(), set_tcp_age();
# ifdef _KERNEL
extern void fr_stateunload();
# endif
#endif /* __IP_STATE_H__ */