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ip_nat6.c
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ip_nat6.c
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/* $NetBSD: ip_nat6.c,v 1.1.1.2 2012/07/22 13:44:21 darrenr Exp $ */
/*
* Copyright (C) 2012 by Darren Reed.
*
* See the IPFILTER.LICENCE file for details on licencing.
*/
#if defined(KERNEL) || defined(_KERNEL)
# undef KERNEL
# undef ipf_nat6_KERNEL
# define KERNEL 1
# define ipf_nat6_KERNEL 1
#endif
#include <sys/errno.h>
#include <sys/types.h>
#include <sys/param.h>
#include <sys/time.h>
#include <sys/file.h>
#if defined(_KERNEL) && defined(__NetBSD_Version__) && \
(__NetBSD_Version__ >= 399002000)
# include <sys/kauth.h>
#endif
#if !defined(_KERNEL)
# include <stdio.h>
# include <string.h>
# include <stdlib.h>
# define ipf_nat6_KERNEL
# ifdef ipf_nat6__OpenBSD__
struct file;
# endif
# include <sys/uio.h>
# undef ipf_nat6_KERNEL
#endif
#if defined(_KERNEL) && (__FreeBSD_version >= 220000)
# include <sys/filio.h>
# include <sys/fcntl.h>
#else
# include <sys/ioctl.h>
#endif
#if !defined(AIX)
# include <sys/fcntl.h>
#endif
#if !defined(linux)
# include <sys/protosw.h>
#endif
#include <sys/socket.h>
#if defined(_KERNEL)
# include <sys/systm.h>
# if !defined(__SVR4) && !defined(__svr4__)
# include <sys/mbuf.h>
# endif
#endif
#if defined(__SVR4) || defined(__svr4__)
# include <sys/filio.h>
# include <sys/byteorder.h>
# ifdef ipf_nat6_KERNEL
# include <sys/dditypes.h>
# endif
# include <sys/stream.h>
# include <sys/kmem.h>
#endif
#if ipf_nat6__FreeBSD_version >= 300000
# include <sys/queue.h>
#endif
#include <net/if.h>
#if ipf_nat6__FreeBSD_version >= 300000
# include <net/if_var.h>
#endif
#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
#if !defined(linux)
# include <netinet/ip_var.h>
#endif
#include <netinet/tcp.h>
#include <netinet/udp.h>
#include <netinet/ip_icmp.h>
#include "netinet/ip_compat.h"
#include <netinet/tcpip.h>
#include "netinet/ip_fil.h"
#include "netinet/ip_nat.h"
#include "netinet/ip_frag.h"
#include "netinet/ip_state.h"
#include "netinet/ip_proxy.h"
#include "netinet/ip_lookup.h"
#include "netinet/ip_dstlist.h"
#include "netinet/ip_sync.h"
#if (__FreeBSD_version >= 300000)
# include <sys/malloc.h>
#endif
#ifdef HAS_SYS_MD5_H
# include <sys/md5.h>
#else
# include "md5.h"
#endif
/* END OF INCLUDES */
#undef SOCKADDR_IN
#define SOCKADDR_IN struct sockaddr_in
#if !defined(lint)
static const char rcsid[] = "@(#)$Id: ip_nat6.c,v 1.1.1.2 2012/07/22 13:44:21 darrenr Exp $";
#endif
#ifdef USE_INET6
static struct hostmap *ipf_nat6_hostmap __P((ipf_nat_softc_t *, ipnat_t *,
i6addr_t *, i6addr_t *,
i6addr_t *, u_32_t));
static int ipf_nat6_match __P((fr_info_t *, ipnat_t *));
static void ipf_nat6_tabmove __P((ipf_nat_softc_t *, nat_t *));
static int ipf_nat6_decap __P((fr_info_t *, nat_t *));
static int ipf_nat6_nextaddr __P((fr_info_t *, nat_addr_t *, i6addr_t *,
i6addr_t *));
static int ipf_nat6_icmpquerytype __P((int));
static int ipf_nat6_out __P((fr_info_t *, nat_t *, int, u_32_t));
static int ipf_nat6_in __P((fr_info_t *, nat_t *, int, u_32_t));
static int ipf_nat6_builddivertmp __P((ipf_nat_softc_t *, ipnat_t *));
static int ipf_nat6_nextaddrinit __P((ipf_main_softc_t *, char *,
nat_addr_t *, int, void *));
static int ipf_nat6_insert __P((ipf_main_softc_t *, ipf_nat_softc_t *,
nat_t *));
#define NINCLSIDE6(y,x) ATOMIC_INCL(softn->ipf_nat_stats.ns_side6[y].x)
#define NBUMPSIDE(y,x) softn->ipf_nat_stats.ns_side[y].x++
#define NBUMPSIDE6(y,x) softn->ipf_nat_stats.ns_side6[y].x++
#define NBUMPSIDE6D(y,x) \
do { \
softn->ipf_nat_stats.ns_side6[y].x++; \
DT(x); \
} while (0)
#define NBUMPSIDE6DX(y,x,z) \
do { \
softn->ipf_nat_stats.ns_side6[y].x++; \
DT(z); \
} while (0)
/* ------------------------------------------------------------------------ */
/* Function: ipf_nat6_ruleaddrinit */
/* Returns: int - 0 == success, else failure */
/* Parameters: in(I) - NAT rule that requires address fields to be init'd */
/* */
/* For each of the source/destination address fields in a NAT rule, call */
/* ipf_nat6_nextaddrinit() to prepare the structure for active duty. Other */
/* IPv6 specific actions can also be taken care of here. */
/* ------------------------------------------------------------------------ */
int
ipf_nat6_ruleaddrinit(softc, softn, n)
ipf_main_softc_t *softc;
ipf_nat_softc_t *softn;
ipnat_t *n;
{
int idx, error;
if (n->in_redir == NAT_BIMAP) {
n->in_ndstip6 = n->in_osrcip6;
n->in_ndstmsk6 = n->in_osrcmsk6;
n->in_odstip6 = n->in_nsrcip6;
n->in_odstmsk6 = n->in_nsrcmsk6;
}
if (n->in_redir & NAT_REDIRECT)
idx = 1;
else
idx = 0;
/*
* Initialise all of the address fields.
*/
error = ipf_nat6_nextaddrinit(softc, n->in_names, &n->in_osrc, 1,
n->in_ifps[idx]);
if (error != 0)
return error;
error = ipf_nat6_nextaddrinit(softc, n->in_names, &n->in_odst, 1,
n->in_ifps[idx]);
if (error != 0)
return error;
error = ipf_nat6_nextaddrinit(softc, n->in_names, &n->in_nsrc, 1,
n->in_ifps[idx]);
if (error != 0)
return error;
error = ipf_nat6_nextaddrinit(softc, n->in_names, &n->in_ndst, 1,
n->in_ifps[idx]);
if (error != 0)
return error;
if (n->in_redir & NAT_DIVERTUDP)
ipf_nat6_builddivertmp(softn, n);
return 0;
}
/* ------------------------------------------------------------------------ */
/* Function: ipf_nat6_addrdr */
/* Returns: Nil */
/* Parameters: n(I) - pointer to NAT rule to add */
/* */
/* Adds a redirect rule to the hash table of redirect rules and the list of */
/* loaded NAT rules. Updates the bitmask indicating which netmasks are in */
/* use by redirect rules. */
/* ------------------------------------------------------------------------ */
void
ipf_nat6_addrdr(softn, n)
ipf_nat_softc_t *softn;
ipnat_t *n;
{
i6addr_t *mask;
ipnat_t **np;
i6addr_t j;
u_int hv;
int k;
if ((n->in_redir & NAT_BIMAP) == NAT_BIMAP) {
k = count6bits(n->in_nsrcmsk6.i6);
mask = &n->in_nsrcmsk6;
IP6_AND(&n->in_odstip6, &n->in_odstmsk6, &j);
hv = NAT_HASH_FN6(&j, 0, softn->ipf_nat_rdrrules_sz);
} else if (n->in_odstatype == FRI_NORMAL) {
k = count6bits(n->in_odstmsk6.i6);
mask = &n->in_odstmsk6;
IP6_AND(&n->in_odstip6, &n->in_odstmsk6, &j);
hv = NAT_HASH_FN6(&j, 0, softn->ipf_nat_rdrrules_sz);
} else {
k = 0;
hv = 0;
mask = NULL;
}
ipf_inet6_mask_add(k, mask, &softn->ipf_nat6_rdr_mask);
np = softn->ipf_nat_rdr_rules + hv;
while (*np != NULL)
np = &(*np)->in_rnext;
n->in_rnext = NULL;
n->in_prnext = np;
n->in_hv[0] = hv;
n->in_use++;
*np = n;
}
/* ------------------------------------------------------------------------ */
/* Function: ipf_nat6_addmap */
/* Returns: Nil */
/* Parameters: n(I) - pointer to NAT rule to add */
/* */
/* Adds a NAT map rule to the hash table of rules and the list of loaded */
/* NAT rules. Updates the bitmask indicating which netmasks are in use by */
/* redirect rules. */
/* ------------------------------------------------------------------------ */
void
ipf_nat6_addmap(softn, n)
ipf_nat_softc_t *softn;
ipnat_t *n;
{
i6addr_t *mask;
ipnat_t **np;
i6addr_t j;
u_int hv;
int k;
if (n->in_osrcatype == FRI_NORMAL) {
k = count6bits(n->in_osrcmsk6.i6);
mask = &n->in_osrcmsk6;
IP6_AND(&n->in_osrcip6, &n->in_osrcmsk6, &j);
hv = NAT_HASH_FN6(&j, 0, softn->ipf_nat_maprules_sz);
} else {
k = 0;
hv = 0;
mask = NULL;
}
ipf_inet6_mask_add(k, mask, &softn->ipf_nat6_map_mask);
np = softn->ipf_nat_map_rules + hv;
while (*np != NULL)
np = &(*np)->in_mnext;
n->in_mnext = NULL;
n->in_pmnext = np;
n->in_hv[1] = hv;
n->in_use++;
*np = n;
}
/* ------------------------------------------------------------------------ */
/* Function: ipf_nat6_del_rdr */
/* Returns: Nil */
/* Parameters: n(I) - pointer to NAT rule to delete */
/* */
/* Removes a NAT rdr rule from the hash table of NAT rdr rules. */
/* ------------------------------------------------------------------------ */
void
ipf_nat6_delrdr(softn, n)
ipf_nat_softc_t *softn;
ipnat_t *n;
{
i6addr_t *mask;
int k;
if ((n->in_redir & NAT_BIMAP) == NAT_BIMAP) {
k = count6bits(n->in_nsrcmsk6.i6);
mask = &n->in_nsrcmsk6;
} else if (n->in_odstatype == FRI_NORMAL) {
k = count6bits(n->in_odstmsk6.i6);
mask = &n->in_odstmsk6;
} else {
k = 0;
mask = NULL;
}
ipf_inet6_mask_del(k, mask, &softn->ipf_nat6_rdr_mask);
if (n->in_rnext != NULL)
n->in_rnext->in_prnext = n->in_prnext;
*n->in_prnext = n->in_rnext;
n->in_use--;
}
/* ------------------------------------------------------------------------ */
/* Function: ipf_nat6_delmap */
/* Returns: Nil */
/* Parameters: n(I) - pointer to NAT rule to delete */
/* */
/* Removes a NAT map rule from the hash table of NAT map rules. */
/* ------------------------------------------------------------------------ */
void
ipf_nat6_delmap(softn, n)
ipf_nat_softc_t *softn;
ipnat_t *n;
{
i6addr_t *mask;
int k;
if (n->in_osrcatype == FRI_NORMAL) {
k = count6bits(n->in_osrcmsk6.i6);
mask = &n->in_osrcmsk6;
} else {
k = 0;
mask = NULL;
}
ipf_inet6_mask_del(k, mask, &softn->ipf_nat6_map_mask);
if (n->in_mnext != NULL)
n->in_mnext->in_pmnext = n->in_pmnext;
*n->in_pmnext = n->in_mnext;
n->in_use--;
}
/* ------------------------------------------------------------------------ */
/* Function: ipf_nat6_hostmap */
/* Returns: struct hostmap* - NULL if no hostmap could be created, */
/* else a pointer to the hostmapping to use */
/* Parameters: np(I) - pointer to NAT rule */
/* real(I) - real IP address */
/* map(I) - mapped IP address */
/* port(I) - destination port number */
/* Write Locks: ipf_nat */
/* */
/* Check if an ip address has already been allocated for a given mapping */
/* that is not doing port based translation. If is not yet allocated, then */
/* create a new entry if a non-NULL NAT rule pointer has been supplied. */
/* ------------------------------------------------------------------------ */
static struct hostmap *
ipf_nat6_hostmap(softn, np, src, dst, map, port)
ipf_nat_softc_t *softn;
ipnat_t *np;
i6addr_t *src, *dst, *map;
u_32_t port;
{
hostmap_t *hm;
u_int hv;
hv = (src->i6[3] ^ dst->i6[3]);
hv += (src->i6[2] ^ dst->i6[2]);
hv += (src->i6[1] ^ dst->i6[1]);
hv += (src->i6[0] ^ dst->i6[0]);
hv += src->i6[3];
hv += src->i6[2];
hv += src->i6[1];
hv += src->i6[0];
hv += dst->i6[3];
hv += dst->i6[2];
hv += dst->i6[1];
hv += dst->i6[0];
hv %= HOSTMAP_SIZE;
for (hm = softn->ipf_hm_maptable[hv]; hm; hm = hm->hm_next)
if (IP6_EQ(&hm->hm_osrc6, src) &&
IP6_EQ(&hm->hm_odst6, dst) &&
((np == NULL) || (np == hm->hm_ipnat)) &&
((port == 0) || (port == hm->hm_port))) {
softn->ipf_nat_stats.ns_hm_addref++;
hm->hm_ref++;
return hm;
}
if (np == NULL) {
softn->ipf_nat_stats.ns_hm_nullnp++;
return NULL;
}
KMALLOC(hm, hostmap_t *);
if (hm) {
hm->hm_next = softn->ipf_hm_maplist;
hm->hm_pnext = &softn->ipf_hm_maplist;
if (softn->ipf_hm_maplist != NULL)
softn->ipf_hm_maplist->hm_pnext = &hm->hm_next;
softn->ipf_hm_maplist = hm;
hm->hm_hnext = softn->ipf_hm_maptable[hv];
hm->hm_phnext = softn->ipf_hm_maptable + hv;
if (softn->ipf_hm_maptable[hv] != NULL)
softn->ipf_hm_maptable[hv]->hm_phnext = &hm->hm_hnext;
softn->ipf_hm_maptable[hv] = hm;
hm->hm_ipnat = np;
np->in_use++;
hm->hm_osrcip6 = *src;
hm->hm_odstip6 = *dst;
hm->hm_nsrcip6 = *map;
hm->hm_ndstip6.i6[0] = 0;
hm->hm_ndstip6.i6[1] = 0;
hm->hm_ndstip6.i6[2] = 0;
hm->hm_ndstip6.i6[3] = 0;
hm->hm_ref = 1;
hm->hm_port = port;
hm->hm_hv = hv;
hm->hm_v = 6;
softn->ipf_nat_stats.ns_hm_new++;
} else {
softn->ipf_nat_stats.ns_hm_newfail++;
}
return hm;
}
/* ------------------------------------------------------------------------ */
/* Function: ipf_nat6_newmap */
/* Returns: int - -1 == error, 0 == success */
/* Parameters: fin(I) - pointer to packet information */
/* nat(I) - pointer to NAT entry */
/* ni(I) - pointer to structure with misc. information needed */
/* to create new NAT entry. */
/* */
/* Given an empty NAT structure, populate it with new information about a */
/* new NAT session, as defined by the matching NAT rule. */
/* ni.nai_ip is passed in uninitialised and must be set, in host byte order,*/
/* to the new IP address for the translation. */
/* ------------------------------------------------------------------------ */
int
ipf_nat6_newmap(fin, nat, ni)
fr_info_t *fin;
nat_t *nat;
natinfo_t *ni;
{
ipf_main_softc_t *softc = fin->fin_main_soft;
ipf_nat_softc_t *softn = softc->ipf_nat_soft;
u_short st_port, dport, sport, port, sp, dp;
i6addr_t in, st_ip;
hostmap_t *hm;
u_32_t flags;
ipnat_t *np;
nat_t *natl;
int l;
/*
* If it's an outbound packet which doesn't match any existing
* record, then create a new port
*/
l = 0;
hm = NULL;
np = ni->nai_np;
st_ip = np->in_snip6;
st_port = np->in_spnext;
flags = nat->nat_flags;
if (flags & IPN_ICMPQUERY) {
sport = fin->fin_data[1];
dport = 0;
} else {
sport = htons(fin->fin_data[0]);
dport = htons(fin->fin_data[1]);
}
/*
* Do a loop until we either run out of entries to try or we find
* a NAT mapping that isn't currently being used. This is done
* because the change to the source is not (usually) being fixed.
*/
do {
port = 0;
in = np->in_nsrc.na_nextaddr;
if (l == 0) {
/*
* Check to see if there is an existing NAT
* setup for this IP address pair.
*/
hm = ipf_nat6_hostmap(softn, np, &fin->fin_src6,
&fin->fin_dst6, &in, 0);
if (hm != NULL)
in = hm->hm_nsrcip6;
} else if ((l == 1) && (hm != NULL)) {
ipf_nat_hostmapdel(softc, &hm);
}
nat->nat_hm = hm;
if (IP6_ISONES(&np->in_nsrcmsk6) && (np->in_spnext == 0)) {
if (l > 0) {
NBUMPSIDE6DX(1, ns_exhausted, ns_exhausted_1);
return -1;
}
}
if ((np->in_redir == NAT_BIMAP) &&
IP6_EQ(&np->in_osrcmsk6, &np->in_nsrcmsk6)) {
i6addr_t temp;
/*
* map the address block in a 1:1 fashion
*/
temp.i6[0] = fin->fin_src6.i6[0] &
~np->in_osrcmsk6.i6[0];
temp.i6[1] = fin->fin_src6.i6[1] &
~np->in_osrcmsk6.i6[1];
temp.i6[2] = fin->fin_src6.i6[2] &
~np->in_osrcmsk6.i6[0];
temp.i6[3] = fin->fin_src6.i6[3] &
~np->in_osrcmsk6.i6[3];
in = np->in_nsrcip6;
IP6_MERGE(&in, &temp, &np->in_osrc);
#ifdef NEED_128BIT_MATH
} else if (np->in_redir & NAT_MAPBLK) {
if ((l >= np->in_ppip) || ((l > 0) &&
!(flags & IPN_TCPUDP))) {
NBUMPSIDE6DX(1, ns_exhausted, ns_exhausted_2);
return -1;
}
/*
* map-block - Calculate destination address.
*/
IP6_MASK(&in, &fin->fin_src6, &np->in_osrcmsk6);
in = ntohl(in);
inb = in;
in.s_addr /= np->in_ippip;
in.s_addr &= ntohl(~np->in_nsrcmsk6);
in.s_addr += ntohl(np->in_nsrcaddr6);
/*
* Calculate destination port.
*/
if ((flags & IPN_TCPUDP) &&
(np->in_ppip != 0)) {
port = ntohs(sport) + l;
port %= np->in_ppip;
port += np->in_ppip *
(inb.s_addr % np->in_ippip);
port += MAPBLK_MINPORT;
port = htons(port);
}
#endif
} else if (IP6_ISZERO(&np->in_nsrcaddr) &&
IP6_ISONES(&np->in_nsrcmsk)) {
/*
* 0/32 - use the interface's IP address.
*/
if ((l > 0) ||
ipf_ifpaddr(softc, 6, FRI_NORMAL, fin->fin_ifp,
&in, NULL) == -1) {
NBUMPSIDE6DX(1, ns_new_ifpaddr,
ns_new_ifpaddr_1);
return -1;
}
} else if (IP6_ISZERO(&np->in_nsrcip6) &&
IP6_ISZERO(&np->in_nsrcmsk6)) {
/*
* 0/0 - use the original source address/port.
*/
if (l > 0) {
NBUMPSIDE6DX(1, ns_exhausted, ns_exhausted_3);
return -1;
}
in = fin->fin_src6;
} else if (!IP6_ISONES(&np->in_nsrcmsk6) &&
(np->in_spnext == 0) && ((l > 0) || (hm == NULL))) {
IP6_INC(&np->in_snip6);
}
natl = NULL;
if ((flags & IPN_TCPUDP) &&
((np->in_redir & NAT_MAPBLK) == 0) &&
(np->in_flags & IPN_AUTOPORTMAP)) {
#ifdef NEED_128BIT_MATH
/*
* "ports auto" (without map-block)
*/
if ((l > 0) && (l % np->in_ppip == 0)) {
if ((l > np->in_ppip) &&
!IP6_ISONES(&np->in_nsrcmsk)) {
IP6_INC(&np->in_snip6)
}
}
if (np->in_ppip != 0) {
port = ntohs(sport);
port += (l % np->in_ppip);
port %= np->in_ppip;
port += np->in_ppip *
(ntohl(fin->fin_src6) %
np->in_ippip);
port += MAPBLK_MINPORT;
port = htons(port);
}
#endif
} else if (((np->in_redir & NAT_MAPBLK) == 0) &&
(flags & IPN_TCPUDPICMP) && (np->in_spnext != 0)) {
/*
* Standard port translation. Select next port.
*/
if (np->in_flags & IPN_SEQUENTIAL) {
port = np->in_spnext;
} else {
port = ipf_random() % (np->in_spmax -
np->in_spmin + 1);
port += np->in_spmin;
}
port = htons(port);
np->in_spnext++;
if (np->in_spnext > np->in_spmax) {
np->in_spnext = np->in_spmin;
if (!IP6_ISONES(&np->in_nsrcmsk6)) {
IP6_INC(&np->in_snip6);
}
}
}
if (np->in_flags & IPN_SIPRANGE) {
if (IP6_GT(&np->in_snip, &np->in_nsrcmsk))
np->in_snip6 = np->in_nsrcip6;
} else {
i6addr_t a1, a2;
a1 = np->in_snip6;
IP6_INC(&a1);
IP6_AND(&a1, &np->in_nsrcmsk6, &a2);
if (!IP6_ISONES(&np->in_nsrcmsk6) &&
IP6_GT(&a2, &np->in_nsrcip6)) {
IP6_ADD(&np->in_nsrcip6, 1, &np->in_snip6);
}
}
if ((port == 0) && (flags & (IPN_TCPUDPICMP|IPN_ICMPQUERY)))
port = sport;
/*
* Here we do a lookup of the connection as seen from
* the outside. If an IP# pair already exists, try
* again. So if you have A->B becomes C->B, you can
* also have D->E become C->E but not D->B causing
* another C->B. Also take protocol and ports into
* account when determining whether a pre-existing
* NAT setup will cause an external conflict where
* this is appropriate.
*/
sp = fin->fin_data[0];
dp = fin->fin_data[1];
fin->fin_data[0] = fin->fin_data[1];
fin->fin_data[1] = ntohs(port);
natl = ipf_nat6_inlookup(fin, flags & ~(SI_WILDP|NAT_SEARCH),
(u_int)fin->fin_p, &fin->fin_dst6.in6,
&in.in6);
fin->fin_data[0] = sp;
fin->fin_data[1] = dp;
/*
* Has the search wrapped around and come back to the
* start ?
*/
if ((natl != NULL) &&
(np->in_spnext != 0) && (st_port == np->in_spnext) &&
(!IP6_ISZERO(&np->in_snip6) &&
IP6_EQ(&st_ip, &np->in_snip6))) {
NBUMPSIDE6D(1, ns_wrap);
return -1;
}
l++;
} while (natl != NULL);
/* Setup the NAT table */
nat->nat_osrc6 = fin->fin_src6;
nat->nat_nsrc6 = in;
nat->nat_odst6 = fin->fin_dst6;
nat->nat_ndst6 = fin->fin_dst6;
if (nat->nat_hm == NULL)
nat->nat_hm = ipf_nat6_hostmap(softn, np, &fin->fin_src6,
&fin->fin_dst6,
&nat->nat_nsrc6, 0);
if (flags & IPN_TCPUDP) {
nat->nat_osport = sport;
nat->nat_nsport = port; /* sport */
nat->nat_odport = dport;
nat->nat_ndport = dport;
((tcphdr_t *)fin->fin_dp)->th_sport = port;
} else if (flags & IPN_ICMPQUERY) {
nat->nat_oicmpid = fin->fin_data[1];
((struct icmp6_hdr *)fin->fin_dp)->icmp6_id = port;
nat->nat_nicmpid = port;
}
return 0;
}
/* ------------------------------------------------------------------------ */
/* Function: ipf_nat6_newrdr */
/* Returns: int - -1 == error, 0 == success (no move), 1 == success and */
/* allow rule to be moved if IPN_ROUNDR is set. */
/* Parameters: fin(I) - pointer to packet information */
/* nat(I) - pointer to NAT entry */
/* ni(I) - pointer to structure with misc. information needed */
/* to create new NAT entry. */
/* */
/* ni.nai_ip is passed in uninitialised and must be set, in host byte order,*/
/* to the new IP address for the translation. */
/* ------------------------------------------------------------------------ */
int
ipf_nat6_newrdr(fin, nat, ni)
fr_info_t *fin;
nat_t *nat;
natinfo_t *ni;
{
ipf_main_softc_t *softc = fin->fin_main_soft;
ipf_nat_softc_t *softn = softc->ipf_nat_soft;
u_short nport, dport, sport;
u_short sp, dp;
hostmap_t *hm;
u_32_t flags;
i6addr_t in;
ipnat_t *np;
nat_t *natl;
int move;
move = 1;
hm = NULL;
in.i6[0] = 0;
in.i6[1] = 0;
in.i6[2] = 0;
in.i6[3] = 0;
np = ni->nai_np;
flags = nat->nat_flags;
if (flags & IPN_ICMPQUERY) {
dport = fin->fin_data[1];
sport = 0;
} else {
sport = htons(fin->fin_data[0]);
dport = htons(fin->fin_data[1]);
}
/* TRACE sport, dport */
/*
* If the matching rule has IPN_STICKY set, then we want to have the
* same rule kick in as before. Why would this happen? If you have
* a collection of rdr rules with "round-robin sticky", the current
* packet might match a different one to the previous connection but
* we want the same destination to be used.
*/
if (((np->in_flags & (IPN_ROUNDR|IPN_SPLIT)) != 0) &&
((np->in_flags & IPN_STICKY) != 0)) {
hm = ipf_nat6_hostmap(softn, NULL, &fin->fin_src6,
&fin->fin_dst6, &in, (u_32_t)dport);
if (hm != NULL) {
in = hm->hm_ndstip6;
np = hm->hm_ipnat;
ni->nai_np = np;
move = 0;
}
}
/*
* 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.
*/
if (np->in_flags & IPN_SPLIT) {
in = np->in_dnip6;
if ((np->in_flags & (IPN_ROUNDR|IPN_STICKY)) == IPN_STICKY) {
hm = ipf_nat6_hostmap(softn, NULL, &fin->fin_src6,
&fin->fin_dst6, &in,
(u_32_t)dport);
if (hm != NULL) {
in = hm->hm_ndstip6;
move = 0;
}
}
if (hm == NULL || hm->hm_ref == 1) {
if (IP6_EQ(&np->in_ndstip6, &in)) {
np->in_dnip6 = np->in_ndstmsk6;
move = 0;
} else {
np->in_dnip6 = np->in_ndstip6;
}
}
} else if (IP6_ISZERO(&np->in_ndstaddr) &&
IP6_ISONES(&np->in_ndstmsk)) {
/*
* 0/32 - use the interface's IP address.
*/
if (ipf_ifpaddr(softc, 6, FRI_NORMAL, fin->fin_ifp,
&in, NULL) == -1) {
NBUMPSIDE6DX(0, ns_new_ifpaddr, ns_new_ifpaddr_2);
return -1;
}
} else if (IP6_ISZERO(&np->in_ndstip6) &&
IP6_ISZERO(&np->in_ndstmsk6)) {
/*
* 0/0 - use the original destination address/port.
*/
in = fin->fin_dst6;
} else if (np->in_redir == NAT_BIMAP &&
IP6_EQ(&np->in_ndstmsk6, &np->in_odstmsk6)) {
i6addr_t temp;
/*
* map the address block in a 1:1 fashion
*/
temp.i6[0] = fin->fin_dst6.i6[0] & ~np->in_osrcmsk6.i6[0];
temp.i6[1] = fin->fin_dst6.i6[1] & ~np->in_osrcmsk6.i6[1];
temp.i6[2] = fin->fin_dst6.i6[2] & ~np->in_osrcmsk6.i6[0];
temp.i6[3] = fin->fin_dst6.i6[3] & ~np->in_osrcmsk6.i6[3];
in = np->in_ndstip6;
IP6_MERGE(&in, &temp, &np->in_ndstmsk6);
} else {
in = np->in_ndstip6;
}
if ((np->in_dpnext == 0) || ((flags & NAT_NOTRULEPORT) != 0))
nport = dport;
else {
/*
* Whilst not optimized for the case where
* pmin == pmax, the gain is not significant.
*/
if (((np->in_flags & IPN_FIXEDDPORT) == 0) &&
(np->in_odport != np->in_dtop)) {
nport = ntohs(dport) - np->in_odport + np->in_dpmax;
nport = htons(nport);
} else {
nport = htons(np->in_dpnext);
np->in_dpnext++;
if (np->in_dpnext > np->in_dpmax)
np->in_dpnext = np->in_dpmin;
}
}
/*
* When the redirect-to address is set to 0.0.0.0, just
* assume a blank `forwarding' of the packet. We don't
* setup any translation for this either.
*/
if (IP6_ISZERO(&in)) {
if (nport == dport) {
NBUMPSIDE6D(0, ns_xlate_null);
return -1;
}
in = fin->fin_dst6;
}
/*
* Check to see if this redirect mapping already exists and if
* it does, return "failure" (allowing it to be created will just
* cause one or both of these "connections" to stop working.)
*/
sp = fin->fin_data[0];
dp = fin->fin_data[1];
fin->fin_data[1] = fin->fin_data[0];
fin->fin_data[0] = ntohs(nport);
natl = ipf_nat6_outlookup(fin, flags & ~(SI_WILDP|NAT_SEARCH),
(u_int)fin->fin_p, &in.in6,
&fin->fin_src6.in6);
fin->fin_data[0] = sp;
fin->fin_data[1] = dp;
if (natl != NULL) {
NBUMPSIDE6D(0, ns_xlate_exists);
return -1;
}
nat->nat_ndst6 = in;
nat->nat_odst6 = fin->fin_dst6;
nat->nat_nsrc6 = fin->fin_src6;
nat->nat_osrc6 = fin->fin_src6;
if ((nat->nat_hm == NULL) && ((np->in_flags & IPN_STICKY) != 0))
nat->nat_hm = ipf_nat6_hostmap(softn, np, &fin->fin_src6,
&fin->fin_dst6, &in,
(u_32_t)dport);
if (flags & IPN_TCPUDP) {
nat->nat_odport = dport;
nat->nat_ndport = nport;
nat->nat_osport = sport;
nat->nat_nsport = sport;
((tcphdr_t *)fin->fin_dp)->th_dport = nport;
} else if (flags & IPN_ICMPQUERY) {
nat->nat_oicmpid = fin->fin_data[1];
((struct icmp6_hdr *)fin->fin_dp)->icmp6_id = nport;
nat->nat_nicmpid = nport;
}
return move;
}
/* ------------------------------------------------------------------------ */
/* Function: ipf_nat6_add */
/* Returns: nat6_t* - NULL == failure to create new NAT structure, */
/* else pointer to new NAT structure */
/* Parameters: fin(I) - pointer to packet information */
/* np(I) - pointer to NAT rule */
/* natsave(I) - pointer to where to store NAT struct pointer */
/* flags(I) - flags describing the current packet */
/* direction(I) - direction of packet (in/out) */
/* Write Lock: ipf_nat */
/* */
/* Attempts to create a new NAT entry. Does not actually change the packet */
/* in any way. */
/* */
/* This fucntion is in three main parts: (1) deal with creating a new NAT */
/* structure for a "MAP" rule (outgoing NAT translation); (2) deal with */
/* creating a new NAT structure for a "RDR" rule (incoming NAT translation) */
/* and (3) building that structure and putting it into the NAT table(s). */
/* */
/* NOTE: natsave should NOT be used top point back to an ipstate_t struct */
/* as it can result in memory being corrupted. */
/* ------------------------------------------------------------------------ */
nat_t *
ipf_nat6_add(fin, np, natsave, flags, direction)
fr_info_t *fin;
ipnat_t *np;
nat_t **natsave;
u_int flags;
int direction;
{
ipf_main_softc_t *softc = fin->fin_main_soft;
ipf_nat_softc_t *softn = softc->ipf_nat_soft;
hostmap_t *hm = NULL;
nat_t *nat, *natl;
natstat_t *nsp;
u_int nflags;
natinfo_t ni;
int move;
#if SOLARIS && defined(_KERNEL) && (SOLARIS2 >= 6) && defined(ICK_M_CTL_MAGIC)
qpktinfo_t *qpi = fin->fin_qpi;
#endif
nsp = &softn->ipf_nat_stats;
if ((nsp->ns_active * 100 / softn->ipf_nat_table_max) >
softn->ipf_nat_table_wm_high) {
softn->ipf_nat_doflush = 1;
}
if (nsp->ns_active >= softn->ipf_nat_table_max) {
NBUMPSIDE6(fin->fin_out, ns_table_max);
return NULL;
}
move = 1;
nflags = np->in_flags & flags;
nflags &= NAT_FROMRULE;
ni.nai_np = np;
ni.nai_dport = 0;
ni.nai_sport = 0;
/* Give me a new nat */
KMALLOC(nat, nat_t *);