NetBSD-5.0.2/dist/ipf/ip_lookup.c
/* $NetBSD: ip_lookup.c,v 1.6 2008/05/20 07:08:06 darrenr Exp $ */
/*
* Copyright (C) 2002-2003 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
#if defined(__osf__)
# define _PROTO_NET_H_
#endif
#include <sys/param.h>
#include <sys/errno.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/file.h>
#if __FreeBSD_version >= 220000 && defined(_KERNEL)
# include <sys/fcntl.h>
# include <sys/filio.h>
#else
# include <sys/ioctl.h>
#endif
#if !defined(_KERNEL)
# include <string.h>
# define _KERNEL
# ifdef __OpenBSD__
struct file;
# endif
# include <sys/uio.h>
# undef _KERNEL
#endif
#include <sys/socket.h>
#if (defined(__osf__) || defined(AIX) || defined(__hpux) || defined(__sgi)) && defined(_KERNEL)
# include "radix_ipf_local.h"
# define _RADIX_H_
#endif
#include <net/if.h>
#if defined(__FreeBSD__)
# include <sys/cdefs.h>
# include <sys/proc.h>
#endif
#if defined(_KERNEL)
# include <sys/systm.h>
# if !defined(__SVR4) && !defined(__svr4__)
# include <sys/mbuf.h>
# endif
#endif
#include <netinet/in.h>
#include "netinet/ip_compat.h"
#include "netinet/ip_fil.h"
#include "netinet/ip_pool.h"
#include "netinet/ip_htable.h"
#include "netinet/ip_lookup.h"
/* END OF INCLUDES */
#if !defined(lint)
static const char rcsid[] = "@(#)Id: ip_lookup.c,v 2.35.2.20 2007/10/26 12:15:12 darrenr Exp";
#endif
#ifdef IPFILTER_LOOKUP
int ip_lookup_inited = 0;
static int iplookup_addnode __P((caddr_t));
static int iplookup_delnode __P((caddr_t data));
static int iplookup_addtable __P((caddr_t));
static int iplookup_deltable __P((caddr_t));
static int iplookup_stats __P((caddr_t));
static int iplookup_flush __P((caddr_t));
static int iplookup_iterate __P((void *, int, void *));
static int iplookup_deltok __P((void *, int, void *));
/* ------------------------------------------------------------------------ */
/* Function: iplookup_init */
/* Returns: int - 0 = success, else error */
/* Parameters: Nil */
/* */
/* Initialise all of the subcomponents of the lookup infrstructure. */
/* ------------------------------------------------------------------------ */
int ip_lookup_init()
{
if (ip_pool_init() == -1)
return -1;
RWLOCK_INIT(&ip_poolrw, "ip pool rwlock");
ip_lookup_inited = 1;
return 0;
}
/* ------------------------------------------------------------------------ */
/* Function: iplookup_unload */
/* Returns: int - 0 = success, else error */
/* Parameters: Nil */
/* */
/* Free up all pool related memory that has been allocated whilst IPFilter */
/* has been running. Also, do any other deinitialisation required such */
/* ip_lookup_init() can be called again, safely. */
/* ------------------------------------------------------------------------ */
void ip_lookup_unload()
{
ip_pool_fini();
fr_htable_unload();
if (ip_lookup_inited == 1) {
RW_DESTROY(&ip_poolrw);
ip_lookup_inited = 0;
}
}
/* ------------------------------------------------------------------------ */
/* Function: iplookup_ioctl */
/* Returns: int - 0 = success, else error */
/* Parameters: data(IO) - pointer to ioctl data to be copied to/from user */
/* space. */
/* cmd(I) - ioctl command number */
/* mode(I) - file mode bits used with open */
/* */
/* Handle ioctl commands sent to the ioctl device. For the most part, this */
/* involves just calling another function to handle the specifics of each */
/* command. */
/* ------------------------------------------------------------------------ */
int ip_lookup_ioctl(data, cmd, mode, uid, ctx)
caddr_t data;
ioctlcmd_t cmd;
int mode, uid;
void *ctx;
{
int err;
SPL_INT(s);
mode = mode; /* LINT */
SPL_NET(s);
switch (cmd)
{
case SIOCLOOKUPADDNODE :
case SIOCLOOKUPADDNODEW :
WRITE_ENTER(&ip_poolrw);
err = iplookup_addnode(data);
RWLOCK_EXIT(&ip_poolrw);
break;
case SIOCLOOKUPDELNODE :
case SIOCLOOKUPDELNODEW :
WRITE_ENTER(&ip_poolrw);
err = iplookup_delnode(data);
RWLOCK_EXIT(&ip_poolrw);
break;
case SIOCLOOKUPADDTABLE :
WRITE_ENTER(&ip_poolrw);
err = iplookup_addtable(data);
RWLOCK_EXIT(&ip_poolrw);
break;
case SIOCLOOKUPDELTABLE :
WRITE_ENTER(&ip_poolrw);
err = iplookup_deltable(data);
RWLOCK_EXIT(&ip_poolrw);
break;
case SIOCLOOKUPSTAT :
case SIOCLOOKUPSTATW :
WRITE_ENTER(&ip_poolrw);
err = iplookup_stats(data);
RWLOCK_EXIT(&ip_poolrw);
break;
case SIOCLOOKUPFLUSH :
WRITE_ENTER(&ip_poolrw);
err = iplookup_flush(data);
RWLOCK_EXIT(&ip_poolrw);
break;
case SIOCLOOKUPITER :
err = iplookup_iterate(data, uid, ctx);
break;
case SIOCIPFDELTOK :
err = iplookup_deltok(data, uid, ctx);
break;
default :
err = EINVAL;
break;
}
SPL_X(s);
return err;
}
/* ------------------------------------------------------------------------ */
/* Function: iplookup_addnode */
/* Returns: int - 0 = success, else error */
/* Parameters: data(I) - pointer to data from ioctl call */
/* */
/* Add a new data node to a lookup structure. First, check to see if the */
/* parent structure refered to by name exists and if it does, then go on to */
/* add a node to it. */
/* ------------------------------------------------------------------------ */
static int iplookup_addnode(data)
caddr_t data;
{
ip_pool_node_t node, *m;
iplookupop_t op;
iphtable_t *iph;
iphtent_t hte;
ip_pool_t *p;
int err;
err = BCOPYIN(data, &op, sizeof(op));
if (err != 0)
return EFAULT;
if (op.iplo_unit < 0 || op.iplo_unit > IPL_LOGMAX)
return EINVAL;
op.iplo_name[sizeof(op.iplo_name) - 1] = '\0';
switch (op.iplo_type)
{
case IPLT_POOL :
if (op.iplo_size != sizeof(node))
return EINVAL;
err = COPYIN(op.iplo_struct, &node, sizeof(node));
if (err != 0)
return EFAULT;
p = ip_pool_find(op.iplo_unit, op.iplo_name);
if (p == NULL)
return ESRCH;
/*
* add an entry to a pool - return an error if it already
* exists remove an entry from a pool - if it exists
* - in both cases, the pool *must* exist!
*/
m = ip_pool_findeq(p, &node.ipn_addr, &node.ipn_mask);
if (m)
return EEXIST;
err = ip_pool_insert(p, &node.ipn_addr.adf_addr,
&node.ipn_mask.adf_addr, node.ipn_info);
break;
case IPLT_HASH :
if (op.iplo_size != sizeof(hte))
return EINVAL;
err = COPYIN(op.iplo_struct, &hte, sizeof(hte));
if (err != 0)
return EFAULT;
iph = fr_findhtable(op.iplo_unit, op.iplo_name);
if (iph == NULL)
return ESRCH;
err = fr_addhtent(iph, &hte);
break;
default :
err = EINVAL;
break;
}
return err;
}
/* ------------------------------------------------------------------------ */
/* Function: iplookup_delnode */
/* Returns: int - 0 = success, else error */
/* Parameters: data(I) - pointer to data from ioctl call */
/* */
/* Delete a node from a lookup table by first looking for the table it is */
/* in and then deleting the entry that gets found. */
/* ------------------------------------------------------------------------ */
static int iplookup_delnode(data)
caddr_t data;
{
ip_pool_node_t node, *m;
iplookupop_t op;
iphtable_t *iph;
iphtent_t hte;
ip_pool_t *p;
int err;
err = BCOPYIN(data, &op, sizeof(op));
if (err != 0)
return EFAULT;
if (op.iplo_unit < 0 || op.iplo_unit > IPL_LOGMAX)
return EINVAL;
op.iplo_name[sizeof(op.iplo_name) - 1] = '\0';
switch (op.iplo_type)
{
case IPLT_POOL :
if (op.iplo_size != sizeof(node))
return EINVAL;
err = COPYIN(op.iplo_struct, &node, sizeof(node));
if (err != 0)
return EFAULT;
p = ip_pool_find(op.iplo_unit, op.iplo_name);
if (!p)
return ESRCH;
m = ip_pool_findeq(p, &node.ipn_addr, &node.ipn_mask);
if (m == NULL)
return ENOENT;
err = ip_pool_remove(p, m);
break;
case IPLT_HASH :
if (op.iplo_size != sizeof(hte))
return EINVAL;
err = COPYIN(op.iplo_struct, &hte, sizeof(hte));
if (err != 0)
return EFAULT;
iph = fr_findhtable(op.iplo_unit, op.iplo_name);
if (iph == NULL)
return ESRCH;
err = fr_delhtent(iph, &hte);
break;
default :
err = EINVAL;
break;
}
return err;
}
/* ------------------------------------------------------------------------ */
/* Function: iplookup_addtable */
/* Returns: int - 0 = success, else error */
/* Parameters: data(I) - pointer to data from ioctl call */
/* */
/* Create a new lookup table, if one doesn't already exist using the name */
/* for this one. */
/* ------------------------------------------------------------------------ */
static int iplookup_addtable(data)
caddr_t data;
{
iplookupop_t op;
int err;
err = BCOPYIN(data, &op, sizeof(op));
if (err != 0)
return EFAULT;
if (op.iplo_unit < 0 || op.iplo_unit > IPL_LOGMAX)
return EINVAL;
op.iplo_name[sizeof(op.iplo_name) - 1] = '\0';
switch (op.iplo_type)
{
case IPLT_POOL :
if (ip_pool_find(op.iplo_unit, op.iplo_name) != NULL)
err = EEXIST;
else
err = ip_pool_create(&op);
break;
case IPLT_HASH :
if (fr_findhtable(op.iplo_unit, op.iplo_name) != NULL)
err = EEXIST;
else
err = fr_newhtable(&op);
break;
default :
err = EINVAL;
break;
}
/*
* For anonymous pools, copy back the operation struct because in the
* case of success it will contain the new table's name.
*/
if ((err == 0) && ((op.iplo_arg & LOOKUP_ANON) != 0)) {
err = BCOPYOUT(&op, data, sizeof(op));
if (err != 0)
err = EFAULT;
}
return err;
}
/* ------------------------------------------------------------------------ */
/* Function: iplookup_deltable */
/* Returns: int - 0 = success, else error */
/* Parameters: data(I) - pointer to data from ioctl call */
/* */
/* Decodes ioctl request to remove a particular hash table or pool and */
/* calls the relevant function to do the cleanup. */
/* ------------------------------------------------------------------------ */
static int iplookup_deltable(data)
caddr_t data;
{
iplookupop_t op;
int err;
err = BCOPYIN(data, &op, sizeof(op));
if (err != 0)
return EFAULT;
if (op.iplo_unit < 0 || op.iplo_unit > IPL_LOGMAX)
return EINVAL;
op.iplo_name[sizeof(op.iplo_name) - 1] = '\0';
/*
* create a new pool - fail if one already exists with
* the same #
*/
switch (op.iplo_type)
{
case IPLT_POOL :
err = ip_pool_destroy(op.iplo_unit, op.iplo_name);
break;
case IPLT_HASH :
err = fr_removehtable(op.iplo_unit, op.iplo_name);
break;
default :
err = EINVAL;
break;
}
return err;
}
/* ------------------------------------------------------------------------ */
/* Function: iplookup_stats */
/* Returns: int - 0 = success, else error */
/* Parameters: data(I) - pointer to data from ioctl call */
/* */
/* Copy statistical information from inside the kernel back to user space. */
/* ------------------------------------------------------------------------ */
static int iplookup_stats(data)
caddr_t data;
{
iplookupop_t op;
int err;
err = BCOPYIN(data, &op, sizeof(op));
if (err != 0)
return EFAULT;
if (op.iplo_unit < 0 || op.iplo_unit > IPL_LOGMAX)
return EINVAL;
switch (op.iplo_type)
{
case IPLT_POOL :
err = ip_pool_statistics(&op);
break;
case IPLT_HASH :
err = fr_gethtablestat(&op);
break;
default :
err = EINVAL;
break;
}
return err;
}
/* ------------------------------------------------------------------------ */
/* Function: iplookup_flush */
/* Returns: int - 0 = success, else error */
/* Parameters: data(I) - pointer to data from ioctl call */
/* */
/* A flush is called when we want to flush all the nodes from a particular */
/* entry in the hash table/pool or want to remove all groups from those. */
/* ------------------------------------------------------------------------ */
static int iplookup_flush(data)
caddr_t data;
{
int err, unit, num, type;
iplookupflush_t flush;
err = BCOPYIN(data, &flush, sizeof(flush));
if (err != 0)
return EFAULT;
unit = flush.iplf_unit;
if ((unit < 0 || unit > IPL_LOGMAX) && (unit != IPLT_ALL))
return EINVAL;
flush.iplf_name[sizeof(flush.iplf_name) - 1] = '\0';
type = flush.iplf_type;
err = EINVAL;
num = 0;
if (type == IPLT_POOL || type == IPLT_ALL) {
err = 0;
num = ip_pool_flush(&flush);
}
if (type == IPLT_HASH || type == IPLT_ALL) {
err = 0;
num += fr_flushhtable(&flush);
}
if (err == 0) {
flush.iplf_count = num;
err = BCOPYOUT(&flush, data, sizeof(flush));
if (err != 0)
err = EFAULT;
}
return err;
}
/* ------------------------------------------------------------------------ */
/* Function: ip_lookup_delref */
/* Returns: void */
/* Parameters: type(I) - table type to operate on */
/* ptr(I) - pointer to object to remove reference for */
/* */
/* This function organises calling the correct deref function for a given */
/* type of object being passed into it. */
/* ------------------------------------------------------------------------ */
void ip_lookup_deref(type, ptr)
int type;
void *ptr;
{
if (ptr == NULL)
return;
WRITE_ENTER(&ip_poolrw);
switch (type)
{
case IPLT_POOL :
ip_pool_deref(ptr);
break;
case IPLT_HASH :
fr_derefhtable(ptr);
break;
}
RWLOCK_EXIT(&ip_poolrw);
}
/* ------------------------------------------------------------------------ */
/* Function: iplookup_iterate */
/* Returns: int - 0 = success, else error */
/* Parameters: data(I) - pointer to data from ioctl call */
/* uid(I) - uid of caller */
/* ctx(I) - pointer to give the uid context */
/* */
/* Decodes ioctl request to step through either hash tables or pools. */
/* ------------------------------------------------------------------------ */
static int iplookup_iterate(data, uid, ctx)
void *data;
int uid;
void *ctx;
{
ipflookupiter_t iter;
ipftoken_t *token;
int err;
SPL_INT(s);
err = fr_inobj(data, &iter, IPFOBJ_LOOKUPITER);
if (err != 0)
return err;
if (iter.ili_unit > IPL_LOGMAX)
return EINVAL;
if (iter.ili_ival != IPFGENITER_LOOKUP)
return EINVAL;
SPL_SCHED(s);
token = ipf_findtoken(iter.ili_key, uid, ctx);
if (token == NULL) {
RWLOCK_EXIT(&ipf_tokens);
SPL_X(s);
return ESRCH;
}
switch (iter.ili_type)
{
case IPLT_POOL :
err = ip_pool_getnext(token, &iter);
break;
case IPLT_HASH :
err = fr_htable_getnext(token, &iter);
break;
default :
err = EINVAL;
break;
}
RWLOCK_EXIT(&ipf_tokens);
SPL_X(s);
return err;
}
/* ------------------------------------------------------------------------ */
/* Function: iplookup_iterderef */
/* Returns: int - 0 = success, else error */
/* Parameters: data(I) - pointer to data from ioctl call */
/* */
/* Decodes ioctl request to remove a particular hash table or pool and */
/* calls the relevant function to do the cleanup. */
/* ------------------------------------------------------------------------ */
void ip_lookup_iterderef(type, data)
u_32_t type;
void *data;
{
iplookupiterkey_t key;
key.ilik_key = type;
if (key.ilik_unstr.ilik_ival != IPFGENITER_LOOKUP)
return;
switch (key.ilik_unstr.ilik_type)
{
case IPLT_HASH :
fr_htable_iterderef((u_int)key.ilik_unstr.ilik_otype,
(int)key.ilik_unstr.ilik_unit, data);
break;
case IPLT_POOL :
ip_pool_iterderef((u_int)key.ilik_unstr.ilik_otype,
(int)key.ilik_unstr.ilik_unit, data);
break;
}
}
/* ------------------------------------------------------------------------ */
/* Function: iplookup_deltok */
/* Returns: int - 0 = success, else error */
/* Parameters: data(I) - pointer to data from ioctl call */
/* uid(I) - uid of caller */
/* ctx(I) - pointer to give the uid context */
/* */
/* Deletes the token identified by the combination of (type,uid,ctx) */
/* "key" is a combination of the table type, iterator type and the unit for */
/* which the token was being used. */
/* ------------------------------------------------------------------------ */
static int iplookup_deltok(data, uid, ctx)
void *data;
int uid;
void *ctx;
{
int error, key;
SPL_INT(s);
SPL_SCHED(s);
error = BCOPYIN(data, &key, sizeof(key));
if (error == 0)
error = ipf_deltoken(key, uid, ctx);
SPL_X(s);
return error;
}
#else /* IPFILTER_LOOKUP */
/*ARGSUSED*/
int ip_lookup_ioctl(data, cmd, mode, uid, ctx)
caddr_t data;
ioctlcmd_t cmd;
int mode, uid;
void *ctx;
{
return EIO;
}
#endif /* IPFILTER_LOOKUP */