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/* $FreeBSD: release/9.1.0/sys/contrib/ipfilter/netinet/ip_htable.c 172776 2007-10-18 21:52:14Z darrenr $ */
/*
* Copyright (C) 1993-2001, 2003 by Darren Reed.
*
* See the IPFILTER.LICENCE file for details on licencing.
*/
#if defined(KERNEL) || defined(_KERNEL)
# undef KERNEL
# undef _KERNEL
# define KERNEL 1
# define _KERNEL 1
#endif
#include <sys/param.h>
#include <sys/types.h>
#include <sys/errno.h>
#include <sys/time.h>
#include <sys/file.h>
#if !defined(_KERNEL)
# include <stdlib.h>
# include <string.h>
# define _KERNEL
# ifdef __OpenBSD__
struct file;
# endif
# include <sys/uio.h>
# undef _KERNEL
#endif
#include <sys/socket.h>
#if defined(__FreeBSD_version) && (__FreeBSD_version >= 300000)
# include <sys/malloc.h>
#endif
#if defined(__FreeBSD__)
# include <sys/cdefs.h>
# include <sys/proc.h>
#endif
#if !defined(__svr4__) && !defined(__SVR4) && !defined(__hpux) && \
!defined(linux)
# include <sys/mbuf.h>
#endif
#if defined(_KERNEL)
# include <sys/systm.h>
#else
# include <stdio.h>
#endif
#include <netinet/in.h>
#include <net/if.h>
#include "netinet/ip_compat.h"
#include "netinet/ip_fil.h"
#include "netinet/ip_lookup.h"
#include "netinet/ip_htable.h"
/* END OF INCLUDES */
#if !defined(lint)
static const char rcsid[] = "@(#)$Id: ip_htable.c,v 2.34.2.11 2007/09/20 12:51:51 darrenr Exp $";
#endif
#ifdef IPFILTER_LOOKUP
static iphtent_t *fr_iphmfind __P((iphtable_t *, struct in_addr *));
static u_long ipht_nomem[IPL_LOGSIZE] = { 0, 0, 0, 0, 0, 0, 0, 0 };
static u_long ipf_nhtables[IPL_LOGSIZE] = { 0, 0, 0, 0, 0, 0, 0, 0 };
static u_long ipf_nhtnodes[IPL_LOGSIZE] = { 0, 0, 0, 0, 0, 0, 0, 0 };
iphtable_t *ipf_htables[IPL_LOGSIZE] = { NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL };
void fr_htable_unload()
{
iplookupflush_t fop;
fop.iplf_unit = IPL_LOGALL;
(void)fr_flushhtable(&fop);
}
int fr_gethtablestat(op)
iplookupop_t *op;
{
iphtstat_t stats;
if (op->iplo_size != sizeof(stats))
return EINVAL;
stats.iphs_tables = ipf_htables[op->iplo_unit];
stats.iphs_numtables = ipf_nhtables[op->iplo_unit];
stats.iphs_numnodes = ipf_nhtnodes[op->iplo_unit];
stats.iphs_nomem = ipht_nomem[op->iplo_unit];
return COPYOUT(&stats, op->iplo_struct, sizeof(stats));
}
/*
* Create a new hash table using the template passed.
*/
int fr_newhtable(op)
iplookupop_t *op;
{
iphtable_t *iph, *oiph;
char name[FR_GROUPLEN];
int err, i, unit;
unit = op->iplo_unit;
if ((op->iplo_arg & IPHASH_ANON) == 0) {
iph = fr_existshtable(unit, op->iplo_name);
if (iph != NULL) {
if ((iph->iph_flags & IPHASH_DELETE) == 0)
return EEXIST;
iph->iph_flags &= ~IPHASH_DELETE;
return 0;
}
}
KMALLOC(iph, iphtable_t *);
if (iph == NULL) {
ipht_nomem[op->iplo_unit]++;
return ENOMEM;
}
err = COPYIN(op->iplo_struct, iph, sizeof(*iph));
if (err != 0) {
KFREE(iph);
return EFAULT;
}
if (iph->iph_unit != unit) {
KFREE(iph);
return EINVAL;
}
if ((op->iplo_arg & IPHASH_ANON) != 0) {
i = IPHASH_ANON;
do {
i++;
#if defined(SNPRINTF) && defined(_KERNEL)
SNPRINTF(name, sizeof(name), "%u", i);
#else
(void)sprintf(name, "%u", i);
#endif
for (oiph = ipf_htables[unit]; oiph != NULL;
oiph = oiph->iph_next)
if (strncmp(oiph->iph_name, name,
sizeof(oiph->iph_name)) == 0)
break;
} while (oiph != NULL);
(void)strncpy(iph->iph_name, name, sizeof(iph->iph_name));
(void)strncpy(op->iplo_name, name, sizeof(op->iplo_name));
iph->iph_type |= IPHASH_ANON;
}
KMALLOCS(iph->iph_table, iphtent_t **,
iph->iph_size * sizeof(*iph->iph_table));
if (iph->iph_table == NULL) {
KFREE(iph);
ipht_nomem[unit]++;
return ENOMEM;
}
bzero((char *)iph->iph_table, iph->iph_size * sizeof(*iph->iph_table));
iph->iph_masks = 0;
iph->iph_list = NULL;
iph->iph_ref = 1;
iph->iph_next = ipf_htables[unit];
iph->iph_pnext = &ipf_htables[unit];
if (ipf_htables[unit] != NULL)
ipf_htables[unit]->iph_pnext = &iph->iph_next;
ipf_htables[unit] = iph;
ipf_nhtables[unit]++;
return 0;
}
/*
*/
int fr_removehtable(unit, name)
int unit;
char *name;
{
iphtable_t *iph;
iph = fr_findhtable(unit, name);
if (iph == NULL)
return ESRCH;
if (iph->iph_unit != unit) {
return EINVAL;
}
if (iph->iph_ref != 0) {
(void) fr_clearhtable(iph);
iph->iph_flags |= IPHASH_DELETE;
return 0;
}
fr_delhtable(iph);
return 0;
}
int fr_clearhtable(iph)
iphtable_t *iph;
{
iphtent_t *ipe;
while ((ipe = iph->iph_list) != NULL)
if (fr_delhtent(iph, ipe) != 0)
return 1;
return 0;
}
int fr_delhtable(iph)
iphtable_t *iph;
{
if (fr_clearhtable(iph) != 0)
return 1;
if (iph->iph_pnext != NULL)
*iph->iph_pnext = iph->iph_next;
if (iph->iph_next != NULL)
iph->iph_next->iph_pnext = iph->iph_pnext;
ipf_nhtables[iph->iph_unit]--;
return fr_derefhtable(iph);
}
/*
* Delete an entry from a hash table.
*/
int fr_delhtent(iph, ipe)
iphtable_t *iph;
iphtent_t *ipe;
{
if (ipe->ipe_phnext != NULL)
*ipe->ipe_phnext = ipe->ipe_hnext;
if (ipe->ipe_hnext != NULL)
ipe->ipe_hnext->ipe_phnext = ipe->ipe_phnext;
if (ipe->ipe_pnext != NULL)
*ipe->ipe_pnext = ipe->ipe_next;
if (ipe->ipe_next != NULL)
ipe->ipe_next->ipe_pnext = ipe->ipe_pnext;
switch (iph->iph_type & ~IPHASH_ANON)
{
case IPHASH_GROUPMAP :
if (ipe->ipe_group != NULL)
fr_delgroup(ipe->ipe_group, IPL_LOGIPF, fr_active);
break;
default :
ipe->ipe_ptr = NULL;
ipe->ipe_value = 0;
break;
}
return fr_derefhtent(ipe);
}
int fr_derefhtable(iph)
iphtable_t *iph;
{
int refs;
iph->iph_ref--;
refs = iph->iph_ref;
if (iph->iph_ref == 0) {
KFREES(iph->iph_table, iph->iph_size * sizeof(*iph->iph_table));
KFREE(iph);
}
return refs;
}
int fr_derefhtent(ipe)
iphtent_t *ipe;
{
ipe->ipe_ref--;
if (ipe->ipe_ref == 0) {
ipf_nhtnodes[ipe->ipe_unit]--;
KFREE(ipe);
return 0;
}
return ipe->ipe_ref;
}
iphtable_t *fr_existshtable(unit, name)
int unit;
char *name;
{
iphtable_t *iph;
for (iph = ipf_htables[unit]; iph != NULL; iph = iph->iph_next)
if (strncmp(iph->iph_name, name, sizeof(iph->iph_name)) == 0)
break;
return iph;
}
iphtable_t *fr_findhtable(unit, name)
int unit;
char *name;
{
iphtable_t *iph;
iph = fr_existshtable(unit, name);
if ((iph != NULL) && (iph->iph_flags & IPHASH_DELETE) == 0)
return iph;
return NULL;
}
size_t fr_flushhtable(op)
iplookupflush_t *op;
{
iphtable_t *iph;
size_t freed;
int i;
freed = 0;
for (i = 0; i <= IPL_LOGMAX; i++) {
if (op->iplf_unit == i || op->iplf_unit == IPL_LOGALL) {
while ((iph = ipf_htables[i]) != NULL) {
if (fr_delhtable(iph) == 0) {
freed++;
} else {
iph->iph_flags |= IPHASH_DELETE;
}
}
}
}
return freed;
}
/*
* Add an entry to a hash table.
*/
int fr_addhtent(iph, ipeo)
iphtable_t *iph;
iphtent_t *ipeo;
{
iphtent_t *ipe;
u_int hv;
int bits;
KMALLOC(ipe, iphtent_t *);
if (ipe == NULL)
return -1;
bcopy((char *)ipeo, (char *)ipe, sizeof(*ipe));
ipe->ipe_addr.in4_addr &= ipe->ipe_mask.in4_addr;
ipe->ipe_addr.in4_addr = ntohl(ipe->ipe_addr.in4_addr);
bits = count4bits(ipe->ipe_mask.in4_addr);
ipe->ipe_mask.in4_addr = ntohl(ipe->ipe_mask.in4_addr);
hv = IPE_HASH_FN(ipe->ipe_addr.in4_addr, ipe->ipe_mask.in4_addr,
iph->iph_size);
ipe->ipe_ref = 1;
ipe->ipe_hnext = iph->iph_table[hv];
ipe->ipe_phnext = iph->iph_table + hv;
if (iph->iph_table[hv] != NULL)
iph->iph_table[hv]->ipe_phnext = &ipe->ipe_hnext;
iph->iph_table[hv] = ipe;
ipe->ipe_next = iph->iph_list;
ipe->ipe_pnext = &iph->iph_list;
if (ipe->ipe_next != NULL)
ipe->ipe_next->ipe_pnext = &ipe->ipe_next;
iph->iph_list = ipe;
if ((bits >= 0) && (bits != 32))
iph->iph_masks |= 1 << bits;
switch (iph->iph_type & ~IPHASH_ANON)
{
case IPHASH_GROUPMAP :
ipe->ipe_ptr = fr_addgroup(ipe->ipe_group, NULL,
iph->iph_flags, IPL_LOGIPF,
fr_active);
break;
default :
ipe->ipe_ptr = NULL;
ipe->ipe_value = 0;
break;
}
ipe->ipe_unit = iph->iph_unit;
ipf_nhtnodes[ipe->ipe_unit]++;
return 0;
}
void *fr_iphmfindgroup(tptr, aptr)
void *tptr, *aptr;
{
struct in_addr *addr;
iphtable_t *iph;
iphtent_t *ipe;
void *rval;
READ_ENTER(&ip_poolrw);
iph = tptr;
addr = aptr;
ipe = fr_iphmfind(iph, addr);
if (ipe != NULL)
rval = ipe->ipe_ptr;
else
rval = NULL;
RWLOCK_EXIT(&ip_poolrw);
return rval;
}
/* ------------------------------------------------------------------------ */
/* Function: fr_iphmfindip */
/* Returns: int - 0 == +ve match, -1 == error, 1 == -ve/no match */
/* Parameters: tptr(I) - pointer to the pool to search */
/* ipversion(I) - IP protocol version (4 or 6) */
/* aptr(I) - pointer to address information */
/* */
/* Search the hash table for a given address and return a search result. */
/* ------------------------------------------------------------------------ */
int fr_iphmfindip(tptr, ipversion, aptr)
void *tptr, *aptr;
int ipversion;
{
struct in_addr *addr;
iphtable_t *iph;
iphtent_t *ipe;
int rval;
if (ipversion != 4)
return -1;
if (tptr == NULL || aptr == NULL)
return -1;
iph = tptr;
addr = aptr;
READ_ENTER(&ip_poolrw);
ipe = fr_iphmfind(iph, addr);
if (ipe != NULL)
rval = 0;
else
rval = 1;
RWLOCK_EXIT(&ip_poolrw);
return rval;
}
/* Locks: ip_poolrw */
static iphtent_t *fr_iphmfind(iph, addr)
iphtable_t *iph;
struct in_addr *addr;
{
u_32_t hmsk, msk, ips;
iphtent_t *ipe;
u_int hv;
hmsk = iph->iph_masks;
msk = 0xffffffff;
maskloop:
ips = ntohl(addr->s_addr) & msk;
hv = IPE_HASH_FN(ips, msk, iph->iph_size);
for (ipe = iph->iph_table[hv]; (ipe != NULL); ipe = ipe->ipe_hnext) {
if (ipe->ipe_mask.in4_addr != msk ||
ipe->ipe_addr.in4_addr != ips) {
continue;
}
break;
}
if ((ipe == NULL) && (hmsk != 0)) {
while (hmsk != 0) {
msk <<= 1;
if (hmsk & 0x80000000)
break;
hmsk <<= 1;
}
if (hmsk != 0) {
hmsk <<= 1;
goto maskloop;
}
}
return ipe;
}
int fr_htable_getnext(token, ilp)
ipftoken_t *token;
ipflookupiter_t *ilp;
{
iphtent_t *node, zn, *nextnode;
iphtable_t *iph, zp, *nextiph;
int err;
err = 0;
iph = NULL;
node = NULL;
nextiph = NULL;
nextnode = NULL;
READ_ENTER(&ip_poolrw);
switch (ilp->ili_otype)
{
case IPFLOOKUPITER_LIST :
iph = token->ipt_data;
if (iph == NULL) {
nextiph = ipf_htables[(int)ilp->ili_unit];
} else {
nextiph = iph->iph_next;
}
if (nextiph != NULL) {
ATOMIC_INC(nextiph->iph_ref);
token->ipt_data = nextiph;
} else {
bzero((char *)&zp, sizeof(zp));
nextiph = &zp;
token->ipt_data = NULL;
}
break;
case IPFLOOKUPITER_NODE :
node = token->ipt_data;
if (node == NULL) {
iph = fr_findhtable(ilp->ili_unit, ilp->ili_name);
if (iph == NULL)
err = ESRCH;
else {
nextnode = iph->iph_list;
}
} else {
nextnode = node->ipe_next;
}
if (nextnode != NULL) {
ATOMIC_INC(nextnode->ipe_ref);
token->ipt_data = nextnode;
} else {
bzero((char *)&zn, sizeof(zn));
nextnode = &zn;
token->ipt_data = NULL;
}
break;
default :
err = EINVAL;
break;
}
RWLOCK_EXIT(&ip_poolrw);
if (err != 0)
return err;
switch (ilp->ili_otype)
{
case IPFLOOKUPITER_LIST :
if (iph != NULL) {
WRITE_ENTER(&ip_poolrw);
fr_derefhtable(iph);
RWLOCK_EXIT(&ip_poolrw);
}
err = COPYOUT(nextiph, ilp->ili_data, sizeof(*nextiph));
if (err != 0)
err = EFAULT;
break;
case IPFLOOKUPITER_NODE :
if (node != NULL) {
WRITE_ENTER(&ip_poolrw);
fr_derefhtent(node);
RWLOCK_EXIT(&ip_poolrw);
}
err = COPYOUT(nextnode, ilp->ili_data, sizeof(*nextnode));
if (err != 0)
err = EFAULT;
break;
}
return err;
}
void fr_htable_iterderef(otype, unit, data)
u_int otype;
int unit;
void *data;
{
if (data == NULL)
return;
if (unit < 0 || unit > IPL_LOGMAX)
return;
switch (otype)
{
case IPFLOOKUPITER_LIST :
WRITE_ENTER(&ip_poolrw);
fr_derefhtable((iphtable_t *)data);
RWLOCK_EXIT(&ip_poolrw);
break;
case IPFLOOKUPITER_NODE :
WRITE_ENTER(&ip_poolrw);
fr_derefhtent((iphtent_t *)data);
RWLOCK_EXIT(&ip_poolrw);
break;
default :
break;
}
}
#endif /* IPFILTER_LOOKUP */