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NetBSD/dist/ipf/ip_pool.c
martti ad9b29ed97 Import IPFilter 4.1.1
2004-03-28 08:55:20 +00:00

757 lines
23 KiB
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/* $NetBSD: ip_pool.c,v 1.1.1.1 2004/03/28 08:55:42 martti Exp $ */
/*
* 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
#if defined(__osf__)
# define _PROTO_NET_H_
#endif
#include <sys/errno.h>
#include <sys/types.h>
#include <sys/param.h>
#include <sys/file.h>
#if !defined(_KERNEL) && !defined(__KERNEL__)
# include <stdio.h>
# include <stdlib.h>
# include <string.h>
# define _KERNEL
# ifdef __OpenBSD__
struct file;
# endif
# include <sys/uio.h>
# undef _KERNEL
#else
# include <sys/systm.h>
# if defined(NetBSD) && (__NetBSD_Version__ >= 104000000)
# include <sys/proc.h>
# endif
#endif
#include <sys/time.h>
#if !defined(linux)
# include <sys/protosw.h>
#endif
#include <sys/socket.h>
#if defined(_KERNEL) && (!defined(__SVR4) && !defined(__svr4__))
# include <sys/mbuf.h>
#endif
#if defined(__SVR4) || defined(__svr4__)
# include <sys/filio.h>
# include <sys/byteorder.h>
# ifdef _KERNEL
# include <sys/dditypes.h>
# endif
# include <sys/stream.h>
# include <sys/kmem.h>
#endif
#if defined(__FreeBSD_version) && (__FreeBSD_version >= 300000)
# include <sys/malloc.h>
#endif
#if (defined(__osf__) || defined(__hpux) || defined(__sgi)) && defined(_KERNEL)
# ifdef __osf__
# include <net/radix.h>
# endif
# include "radix_ipf_local.h"
# define _RADIX_H_
#endif
#include <net/if.h>
#include <netinet/in.h>
#include "netinet/ip_compat.h"
#include "netinet/ip_fil.h"
#include "netinet/ip_pool.h"
#if defined(_KERNEL) && !defined(__osf__) && !defined(__hpux) && \
!(defined(sun) && (defined(__svr4__) || defined(__SVR4)))
static int rn_freenode __P((struct radix_node *, void *));
#endif
/* END OF INCLUDES */
#if !defined(lint)
static const char sccsid[] = "@(#)ip_fil.c 2.41 6/5/96 (C) 1993-2000 Darren Reed";
static const char rcsid[] = "@(#)Id: ip_pool.c,v 2.55.2.5 2004/03/23 12:44:33 darrenr Exp";
#endif
#ifdef IPFILTER_LOOKUP
ip_pool_stat_t ipoolstat;
ipfrwlock_t ip_poolrw;
/*
* Binary tree routines from Sedgewick and enhanced to do ranges of addresses.
* NOTE: Insertion *MUST* be from greatest range to least for it to work!
* These should be replaced, eventually, by something else - most notably a
* interval searching method. The important feature is to be able to find
* the best match.
*
* So why not use a radix tree for this? As the first line implies, it
* has been written to work with a _range_ of addresses. A range is not
* necessarily a match with any given netmask so what we end up dealing
* with is an interval tree. Implementations of these are hard to find
* and the one herein is far from bug free.
*
* Sigh, in the end I became convinced that the bugs the code contained did
* not make it worthwhile not using radix trees. For now the radix tree from
* 4.4 BSD is used, but this is not viewed as a long term solution.
*/
ip_pool_t *ip_pool_list[IPL_LOGSIZE] = { NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL };
#ifdef TEST_POOL
void treeprint __P((ip_pool_t *));
int
main(argc, argv)
int argc;
char *argv[];
{
addrfamily_t a, b;
iplookupop_t op;
ip_pool_t *ipo;
i6addr_t ip;
RWLOCK_INIT(&ip_poolrw, "poolrw");
ip_pool_init();
bzero((char *)&a, sizeof(a));
bzero((char *)&b, sizeof(b));
bzero((char *)&ip, sizeof(ip));
bzero((char *)&op, sizeof(op));
strcpy(op.iplo_name, "0");
if (ip_pool_create(&op) == 0)
ipo = ip_pool_find(0, "0");
a.adf_addr.in4.s_addr = 0x0a010203;
b.adf_addr.in4.s_addr = 0xffffffff;
ip_pool_insert(ipo, &a.adf_addr, &b.adf_addr, 1);
ip_pool_insert(ipo, &a.adf_addr, &b.adf_addr, 1);
a.adf_addr.in4.s_addr = 0x0a000000;
b.adf_addr.in4.s_addr = 0xff000000;
ip_pool_insert(ipo, &a.adf_addr, &b.adf_addr, 0);
ip_pool_insert(ipo, &a.adf_addr, &b.adf_addr, 0);
a.adf_addr.in4.s_addr = 0x0a010100;
b.adf_addr.in4.s_addr = 0xffffff00;
ip_pool_insert(ipo, &a.adf_addr, &b.adf_addr, 1);
ip_pool_insert(ipo, &a.adf_addr, &b.adf_addr, 1);
a.adf_addr.in4.s_addr = 0x0a010200;
b.adf_addr.in4.s_addr = 0xffffff00;
ip_pool_insert(ipo, &a.adf_addr, &b.adf_addr, 0);
ip_pool_insert(ipo, &a.adf_addr, &b.adf_addr, 0);
a.adf_addr.in4.s_addr = 0x0a010000;
b.adf_addr.in4.s_addr = 0xffff0000;
ip_pool_insert(ipo, &a.adf_addr, &b.adf_addr, 1);
ip_pool_insert(ipo, &a.adf_addr, &b.adf_addr, 1);
a.adf_addr.in4.s_addr = 0x0a01020f;
b.adf_addr.in4.s_addr = 0xffffffff;
ip_pool_insert(ipo, &a.adf_addr, &b.adf_addr, 1);
ip_pool_insert(ipo, &a.adf_addr, &b.adf_addr, 1);
#ifdef DEBUG_POOL
treeprint(ipo);
#endif
ip.in4.s_addr = 0x0a00aabb;
printf("search(%#x) = %d (0)\n", ip.in4.s_addr,
ip_pool_search(ipo, 4, &ip));
ip.in4.s_addr = 0x0a000001;
printf("search(%#x) = %d (0)\n", ip.in4.s_addr,
ip_pool_search(ipo, 4, &ip));
ip.in4.s_addr = 0x0a000101;
printf("search(%#x) = %d (0)\n", ip.in4.s_addr,
ip_pool_search(ipo, 4, &ip));
ip.in4.s_addr = 0x0a010001;
printf("search(%#x) = %d (1)\n", ip.in4.s_addr,
ip_pool_search(ipo, 4, &ip));
ip.in4.s_addr = 0x0a010101;
printf("search(%#x) = %d (1)\n", ip.in4.s_addr,
ip_pool_search(ipo, 4, &ip));
ip.in4.s_addr = 0x0a010201;
printf("search(%#x) = %d (0)\n", ip.in4.s_addr,
ip_pool_search(ipo, 4, &ip));
ip.in4.s_addr = 0x0a010203;
printf("search(%#x) = %d (1)\n", ip.in4.s_addr,
ip_pool_search(ipo, 4, &ip));
ip.in4.s_addr = 0x0a01020f;
printf("search(%#x) = %d (1)\n", ip.in4.s_addr,
ip_pool_search(ipo, 4, &ip));
ip.in4.s_addr = 0x0b00aabb;
printf("search(%#x) = %d (-1)\n", ip.in4.s_addr,
ip_pool_search(ipo, 4, &ip));
#ifdef DEBUG_POOL
treeprint(ipo);
#endif
ip_pool_fini();
return 0;
}
void
treeprint(ipo)
ip_pool_t *ipo;
{
ip_pool_node_t *c;
for (c = ipo->ipo_list; c != NULL; c = c->ipn_next)
printf("Node %p(%s) (%#x/%#x) = %d hits %lu\n",
c, c->ipn_name, c->ipn_addr.adf_addr.in4.s_addr,
c->ipn_mask.adf_addr.in4.s_addr,
c->ipn_info, c->ipn_hits);
}
#endif /* TEST_POOL */
/* ------------------------------------------------------------------------ */
/* Function: ip_pool_init */
/* Returns: int - 0 = success, else error */
/* */
/* Initialise the routing table data structures where required. */
/* ------------------------------------------------------------------------ */
int ip_pool_init()
{
bzero((char *)&ipoolstat, sizeof(ipoolstat));
#if (!defined(_KERNEL) || (BSD < 199306))
rn_init();
#endif
return 0;
}
/* ------------------------------------------------------------------------ */
/* Function: ip_pool_fini */
/* Returns: int - 0 = success, else error */
/* Locks: WRITE(ipf_global) */
/* */
/* Clean up all the pool data structures allocated and call the cleanup */
/* function for the radix tree that supports the pools. ip_pool_destroy() is*/
/* used to delete the pools one by one to ensure they're properly freed up. */
/* ------------------------------------------------------------------------ */
void ip_pool_fini()
{
ip_pool_t *p, *q;
iplookupop_t op;
int i;
ASSERT(rw_read_locked(&ipf_global.ipf_lk) == 0);
for (i = 0; i <= IPL_LOGMAX; i++) {
for (q = ip_pool_list[i]; (p = q) != NULL; ) {
op.iplo_unit = i;
(void)strncpy(op.iplo_name, p->ipo_name,
sizeof(op.iplo_name));
q = p->ipo_next;
(void) ip_pool_destroy(&op);
}
}
#if (!defined(_KERNEL) || (BSD < 199306))
rn_fini();
#endif
}
/* ------------------------------------------------------------------------ */
/* Function: ip_pool_statistics */
/* Returns: int - 0 = success, else error */
/* Parameters: op(I) - pointer to lookup operation arguments */
/* */
/* Copy the current statistics out into user space, collecting pool list */
/* pointers as appropriate for later use. */
/* ------------------------------------------------------------------------ */
int ip_pool_statistics(op)
iplookupop_t *op;
{
ip_pool_stat_t stats;
int unit, i, err = 0;
if (op->iplo_size != sizeof(ipoolstat))
return EINVAL;
bcopy((char *)&ipoolstat, (char *)&stats, sizeof(stats));
unit = op->iplo_unit;
if (unit == IPL_LOGALL) {
for (i = 0; i < IPL_LOGSIZE; i++)
stats.ipls_list[i] = ip_pool_list[i];
} else if (unit >= 0 && unit < IPL_LOGSIZE) {
stats.ipls_list[unit] = ip_pool_list[unit];
} else
err = EINVAL;
if (err == 0)
err = COPYOUT(&stats, op->iplo_struct, sizeof(stats));
return err;
}
/* ------------------------------------------------------------------------ */
/* Function: ip_pool_find */
/* Returns: int - 0 = success, else error */
/* Parameters: ipo(I) - pointer to the pool getting the new node. */
/* */
/* Find a matching pool inside the collection of pools for a particular */
/* device, indicated by the unit number. */
/* ------------------------------------------------------------------------ */
void *ip_pool_find(unit, name)
int unit;
char *name;
{
ip_pool_t *p;
for (p = ip_pool_list[unit]; p != NULL; p = p->ipo_next)
if (strcmp(p->ipo_name, name) == 0)
break;
return p;
}
/* ------------------------------------------------------------------------ */
/* Function: ip_pool_findeq */
/* Returns: int - 0 = success, else error */
/* Parameters: ipo(I) - pointer to the pool getting the new node. */
/* inaddr(I) - pointer to address information to delete */
/* inmask(I) - */
/* */
/* Searches for an exact match of an entry in the pool. */
/* ------------------------------------------------------------------------ */
ip_pool_node_t *ip_pool_findeq(ipo, addr, mask)
ip_pool_t *ipo;
addrfamily_t *addr, *mask;
{
struct radix_node *n;
n = ipo->ipo_head->rnh_lookup(addr, mask, ipo->ipo_head);
return (ip_pool_node_t *)n;
}
/* ------------------------------------------------------------------------ */
/* Function: ip_pool_search */
/* Returns: int - 0 == +ve match, -1 == error, 1 == -ve match */
/* Parameters: tptr(I) - pointer to the pool to search */
/* version(I) - IP protocol version (4 or 6) */
/* dptr(I) - pointer to address information */
/* */
/* Search the pool for a given address and return a search result. */
/* ------------------------------------------------------------------------ */
int ip_pool_search(tptr, version, dptr)
void *tptr;
int version;
void *dptr;
{
struct radix_node *rn;
ip_pool_node_t *m;
i6addr_t *addr;
addrfamily_t v;
ip_pool_t *ipo;
int rv;
ipo = tptr;
if (ipo == NULL)
return -1;
rv = -1;
m = NULL;
addr = (i6addr_t *)dptr;
bzero(&v, sizeof(v));
v.adf_len = offsetof(addrfamily_t, adf_addr);
if (version == 4) {
v.adf_len += sizeof(addr->in4);
v.adf_addr.in4 = addr->in4;
#ifdef USE_INET6
} else if (version == 6) {
v.adf_len += sizeof(addr->in6);
v.adf_addr.in6 = addr->in6;
#endif
} else
return -1;
READ_ENTER(&ip_poolrw);
rn = ipo->ipo_head->rnh_matchaddr(&v, ipo->ipo_head);
if (rn != NULL) {
m = (ip_pool_node_t *)rn;
ipo->ipo_hits++;
m->ipn_hits++;
rv = m->ipn_info;
}
RWLOCK_EXIT(&ip_poolrw);
return rv;
}
/* ------------------------------------------------------------------------ */
/* Function: ip_pool_insert */
/* Returns: int - 0 = success, else error */
/* Parameters: ipo(I) - pointer to the pool getting the new node. */
/* addr(I) - address being added as a node */
/* mask(I) - netmask to with the node being added */
/* info(I) - extra information to store in this node. */
/* Locks: WRITE(ip_poolrw) */
/* */
/* Add another node to the pool given by ipo. The three parameters passed */
/* in (addr, mask, info) shold all be stored in the node. */
/* ------------------------------------------------------------------------ */
int ip_pool_insert(ipo, addr, mask, info)
ip_pool_t *ipo;
i6addr_t *addr, *mask;
int info;
{
struct radix_node *rn;
ip_pool_node_t *x;
ASSERT(rw_read_locked(&ip_poolrw.ipf_lk) == 0);
KMALLOC(x, ip_pool_node_t *);
if (x == NULL) {
return ENOMEM;
}
bzero(x, sizeof(*x));
x->ipn_info = info;
(void)strncpy(x->ipn_name, ipo->ipo_name, sizeof(x->ipn_name));
bcopy(addr, &x->ipn_addr.adf_addr, sizeof(*addr));
x->ipn_addr.adf_len = sizeof(x->ipn_addr);
bcopy(mask, &x->ipn_mask.adf_addr, sizeof(*mask));
x->ipn_mask.adf_len = sizeof(x->ipn_mask);
rn = ipo->ipo_head->rnh_addaddr(&x->ipn_addr, &x->ipn_mask,
ipo->ipo_head, x->ipn_nodes);
#ifdef DEBUG_POOL
printf("Added %p at %p\n", x, rn);
#endif
if (rn == NULL) {
KFREE(x);
return ENOMEM;
}
x->ipn_next = ipo->ipo_list;
x->ipn_pnext = &ipo->ipo_list;
if (ipo->ipo_list != NULL)
ipo->ipo_list->ipn_pnext = &x->ipn_next;
ipo->ipo_list = x;
ipoolstat.ipls_nodes++;
return 0;
}
/* ------------------------------------------------------------------------ */
/* Function: ip_pool_create */
/* Returns: int - 0 = success, else error */
/* Parameters: op(I) - pointer to iplookup struct with call details */
/* Locks: WRITE(ip_poolrw) */
/* */
/* Creates a new group according to the paramters passed in via the */
/* iplookupop structure. Does not check to see if the group already exists */
/* when being inserted - assume this has already been done. If the pool is */
/* marked as being anonymous, give it a new, unique, identifier. Call any */
/* other functions required to initialise the structure. */
/* ------------------------------------------------------------------------ */
int ip_pool_create(op)
iplookupop_t *op;
{
char name[FR_GROUPLEN];
int poolnum, unit;
ip_pool_t *h;
ASSERT(rw_read_locked(&ip_poolrw.ipf_lk) == 0);
KMALLOC(h, ip_pool_t *);
if (h == NULL)
return ENOMEM;
bzero(h, sizeof(*h));
if (rn_inithead((void **)&h->ipo_head,
offsetof(addrfamily_t, adf_addr) << 3) == 0) {
KFREE(h);
return ENOMEM;
}
unit = op->iplo_unit;
if ((op->iplo_arg & IPOOL_ANON) != 0) {
ip_pool_t *p;
poolnum = IPOOL_ANON;
#if defined(SNPRINTF) && defined(_KERNEL)
SNPRINTF(name, sizeof(name), "%x", poolnum);
#else
(void)sprintf(name, "%x", poolnum);
#endif
for (p = ip_pool_list[unit]; p != NULL; ) {
if (strcmp(name, p->ipo_name) == 0) {
poolnum++;
#if defined(SNPRINTF) && defined(_KERNEL)
SNPRINTF(name, sizeof(name), "%x", poolnum);
#else
(void)sprintf(name, "%x", poolnum);
#endif
p = ip_pool_list[unit];
} else
p = p->ipo_next;
}
(void)strncpy(h->ipo_name, name, sizeof(h->ipo_name));
} else {
(void) strncpy(h->ipo_name, op->iplo_name, sizeof(h->ipo_name));
}
h->ipo_ref = 1;
h->ipo_list = NULL;
h->ipo_unit = unit;
h->ipo_next = ip_pool_list[unit];
if (ip_pool_list[unit] != NULL)
ip_pool_list[unit]->ipo_pnext = &h->ipo_next;
h->ipo_pnext = &ip_pool_list[unit];
ip_pool_list[unit] = h;
ipoolstat.ipls_pools++;
return 0;
}
/* ------------------------------------------------------------------------ */
/* Function: ip_pool_remove */
/* Returns: int - 0 = success, else error */
/* Parameters: ipo(I) - pointer to the pool to remove the node from. */
/* ipe(I) - address being deleted as a node */
/* Locks: WRITE(ip_poolrw) */
/* */
/* Add another node to the pool given by ipo. The three parameters passed */
/* in (addr, mask, info) shold all be stored in the node. */
/* ------------------------------------------------------------------------ */
int ip_pool_remove(ipo, ipe)
ip_pool_t *ipo;
ip_pool_node_t *ipe;
{
ip_pool_node_t **ipp, *n;
ASSERT(rw_read_locked(&ip_poolrw.ipf_lk) == 0);
for (ipp = &ipo->ipo_list; (n = *ipp) != NULL; ipp = &n->ipn_next) {
if (ipe == n) {
*n->ipn_pnext = n->ipn_next;
if (n->ipn_next)
n->ipn_next->ipn_pnext = n->ipn_pnext;
break;
}
}
if (n == NULL)
return ENOENT;
ipo->ipo_head->rnh_deladdr(&n->ipn_addr, &n->ipn_mask,
ipo->ipo_head);
KFREE(n);
ipoolstat.ipls_nodes--;
return 0;
}
/* ------------------------------------------------------------------------ */
/* Function: ip_pool_destroy */
/* Returns: int - 0 = success, else error */
/* Parameters: op(I) - information about the pool to remove */
/* Locks: WRITE(ip_poolrw) or WRITE(ipf_global) */
/* */
/* Search for a pool using paramters passed in and if it's not otherwise */
/* busy, free it. */
/* */
/* NOTE: Because this function is called out of ipldetach() where ip_poolrw */
/* may not be initialised, we can't use an ASSERT to enforce the locking */
/* assertion that one of the two (ip_poolrw,ipf_global) is held. */
/* ------------------------------------------------------------------------ */
int ip_pool_destroy(op)
iplookupop_t *op;
{
ip_pool_t *ipo;
ipo = ip_pool_find(op->iplo_unit, op->iplo_name);
if (ipo == NULL)
return ESRCH;
if (ipo->ipo_ref != 1)
return EBUSY;
ip_pool_free(ipo);
return 0;
}
/* ------------------------------------------------------------------------ */
/* Function: ip_pool_flush */
/* Returns: int - number of pools deleted */
/* Parameters: fp(I) - which pool(s) to flush */
/* Locks: WRITE(ip_poolrw) or WRITE(ipf_global) */
/* */
/* Free all pools associated with the device that matches the unit number */
/* passed in with operation. */
/* */
/* NOTE: Because this function is called out of ipldetach() where ip_poolrw */
/* may not be initialised, we can't use an ASSERT to enforce the locking */
/* assertion that one of the two (ip_poolrw,ipf_global) is held. */
/* ------------------------------------------------------------------------ */
int ip_pool_flush(fp)
iplookupflush_t *fp;
{
int i, num = 0, unit, err;
ip_pool_t *p, *q;
iplookupop_t op;
unit = fp->iplf_unit;
for (i = 0; i <= IPL_LOGMAX; i++) {
if (unit != IPLT_ALL && i != unit)
continue;
for (q = ip_pool_list[i]; (p = q) != NULL; ) {
op.iplo_unit = i;
(void)strncpy(op.iplo_name, p->ipo_name,
sizeof(op.iplo_name));
q = p->ipo_next;
err = ip_pool_destroy(&op);
if (err == 0)
num++;
else
break;
}
}
return num;
}
/* ------------------------------------------------------------------------ */
/* Function: ip_pool_free */
/* Returns: void */
/* Parameters: ipo(I) - pointer to pool structure */
/* Locks: WRITE(ip_poolrw) or WRITE(ipf_global) */
/* */
/* Deletes the pool strucutre passed in from the list of pools and deletes */
/* all of the address information stored in it, including any tree data */
/* structures also allocated. */
/* */
/* NOTE: Because this function is called out of ipldetach() where ip_poolrw */
/* may not be initialised, we can't use an ASSERT to enforce the locking */
/* assertion that one of the two (ip_poolrw,ipf_global) is held. */
/* ------------------------------------------------------------------------ */
void ip_pool_free(ipo)
ip_pool_t *ipo;
{
ip_pool_node_t *n;
while ((n = ipo->ipo_list) != NULL) {
ipo->ipo_head->rnh_deladdr(&n->ipn_addr, &n->ipn_mask,
ipo->ipo_head);
*n->ipn_pnext = n->ipn_next;
if (n->ipn_next)
n->ipn_next->ipn_pnext = n->ipn_pnext;
KFREE(n);
ipoolstat.ipls_nodes--;
}
ipo->ipo_list = NULL;
if (ipo->ipo_next != NULL)
ipo->ipo_next->ipo_pnext = ipo->ipo_pnext;
*ipo->ipo_pnext = ipo->ipo_next;
rn_freehead(ipo->ipo_head);
KFREE(ipo);
ipoolstat.ipls_pools--;
}
/* ------------------------------------------------------------------------ */
/* Function: ip_pool_deref */
/* Returns: void */
/* Parameters: ipo(I) - pointer to pool structure */
/* Locks: WRITE(ip_poolrw) */
/* */
/* Drop the number of known references to this pool structure by one and if */
/* we arrive at zero known references, free it. */
/* ------------------------------------------------------------------------ */
void ip_pool_deref(ipo)
ip_pool_t *ipo;
{
ASSERT(rw_read_locked(&ip_poolrw.ipf_lk) == 0);
ipo->ipo_ref--;
if (ipo->ipo_ref == 0)
ip_pool_free(ipo);
}
# if defined(_KERNEL) && ((BSD >= 198911) && !defined(__osf__) && \
!defined(__hpux) && !defined(__sgi))
static int
rn_freenode(struct radix_node *n, void *p)
{
struct radix_node_head *rnh = p;
struct radix_node *d;
d = rnh->rnh_deladdr(n->rn_key, NULL, rnh);
if (d != NULL) {
FreeS(d, max_keylen + 2 * sizeof (*d));
}
return 0;
}
void
rn_freehead(rnh)
struct radix_node_head *rnh;
{
(*rnh->rnh_walktree)(rnh, rn_freenode, rnh);
rnh->rnh_addaddr = NULL;
rnh->rnh_deladdr = NULL;
rnh->rnh_matchaddr = NULL;
rnh->rnh_lookup = NULL;
rnh->rnh_walktree = NULL;
Free(rnh);
}
# endif
#endif /* IPFILTER_LOOKUP */
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