/* $NetBSD: radix_ipf.c,v 1.3 2012/07/22 14:27:35 darrenr Exp $ */
/*
* Copyright (C) 2012 by Darren Reed.
*
* See the IPFILTER.LICENCE file for details on licencing.
*/
#include <sys/types.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <sys/param.h>
#include <netinet/in.h>
#include <net/if.h>
#if !defined(_KERNEL)
# include <stddef.h>
# include <stdlib.h>
# include <strings.h>
# include <string.h>
#endif
#include "netinet/ip_compat.h"
#include "netinet/ip_fil.h"
#ifdef RDX_DEBUG
# include <arpa/inet.h>
# include <stdlib.h>
# include <stdio.h>
#endif
#include "netinet/radix_ipf.h"
#define ADF_OFF offsetof(addrfamily_t, adf_addr)
#define ADF_OFF_BITS ((ADF_OFF << 3) & 0xffff)
static ipf_rdx_node_t *ipf_rx_insert __P((ipf_rdx_head_t *,
ipf_rdx_node_t nodes[2], int *));
static void ipf_rx_attach_mask __P((ipf_rdx_node_t *, ipf_rdx_mask_t *));
static int count_mask_bits __P((addrfamily_t *, u_32_t **));
static void buildnodes __P((addrfamily_t *, addrfamily_t *,
ipf_rdx_node_t n[2]));
static ipf_rdx_node_t *ipf_rx_find_addr __P((ipf_rdx_node_t *, u_32_t *));
static ipf_rdx_node_t *ipf_rx_lookup __P((ipf_rdx_head_t *, addrfamily_t *,
addrfamily_t *));
static ipf_rdx_node_t *ipf_rx_match __P((ipf_rdx_head_t *, addrfamily_t *));
/*
* Foreword.
* ---------
* The code in this file has been written to target using the addrfamily_t
* data structure to house the address information and no other. Thus there
* are certain aspects of thise code (such as offsets to the address itself)
* that are hard coded here whilst they might be more variable elsewhere.
* Similarly, this code enforces no maximum key length as that's implied by
* all keys needing to be stored in addrfamily_t.
*/
/* ------------------------------------------------------------------------ */
/* Function: count_mask_bits */
/* Returns: number of consecutive bits starting at "mask". */
/* */
/* Count the number of bits set in the address section of addrfamily_t and */
/* return both that number and a pointer to the last word with a bit set if */
/* lastp is not NULL. The bit count is performed using network byte order */
/* as the guide for which bit is the most significant bit. */
/* ------------------------------------------------------------------------ */
static int
count_mask_bits(mask, lastp)
addrfamily_t *mask;
u_32_t **lastp;
{
u_32_t *mp = (u_32_t *)&mask->adf_addr;
u_32_t m;
int count = 0;
int mlen;
mlen = mask->adf_len - offsetof(addrfamily_t, adf_addr);
for (; mlen > 0; mlen -= 4, mp++) {
if ((m = ntohl(*mp)) == 0)
break;
if (lastp != NULL)
*lastp = mp;
for (; m & 0x80000000; m <<= 1)
count++;
}
return count;
}
/* ------------------------------------------------------------------------ */
/* Function: buildnodes */
/* Returns: Nil */
/* Parameters: addr(I) - network address for this radix node */
/* mask(I) - netmask associated with the above address */
/* nodes(O) - pair of ipf_rdx_node_t's to initialise with data */
/* associated with addr and mask. */
/* */
/* Initialise the fields in a pair of radix tree nodes according to the */
/* data supplied in the paramters "addr" and "mask". It is expected that */
/* "mask" will contain a consecutive string of bits set. Masks with gaps in */
/* the middle are not handled by this implementation. */
/* ------------------------------------------------------------------------ */
static void
buildnodes(addr, mask, nodes)
addrfamily_t *addr, *mask;
ipf_rdx_node_t nodes[2];
{
u_32_t maskbits;
u_32_t lastbits;
u_32_t lastmask;
u_32_t *last;
int masklen;
last = NULL;
maskbits = count_mask_bits(mask, &last);
if (last == NULL) {
masklen = 0;
lastmask = 0;
} else {
masklen = last - (u_32_t *)mask;
lastmask = *last;
}
lastbits = maskbits & 0x1f;
bzero(&nodes[0], sizeof(ipf_rdx_node_t) * 2);
nodes[0].maskbitcount = maskbits;
nodes[0].index = -1 - (ADF_OFF_BITS + maskbits);
nodes[0].addrkey = (u_32_t *)addr;
nodes[0].maskkey = (u_32_t *)mask;
nodes[0].addroff = nodes[0].addrkey + masklen;
nodes[0].maskoff = nodes[0].maskkey + masklen;
nodes[0].parent = &nodes[1];
nodes[0].offset = masklen;
nodes[0].lastmask = lastmask;
nodes[1].offset = masklen;
nodes[1].left = &nodes[0];
nodes[1].maskbitcount = maskbits;
#ifdef RDX_DEBUG
(void) strcpy(nodes[0].name, "_BUILD.0");
(void) strcpy(nodes[1].name, "_BUILD.1");
#endif
}
/* ------------------------------------------------------------------------ */
/* Function: ipf_rx_find_addr */
/* Returns: ipf_rdx_node_t * - pointer to a node in the radix tree. */
/* Parameters: tree(I) - pointer to first right node in tree to search */
/* addr(I) - pointer to address to match */
/* */
/* Walk the radix tree given by "tree", looking for a leaf node that is a */
/* match for the address given by "addr". */
/* ------------------------------------------------------------------------ */
static ipf_rdx_node_t *
ipf_rx_find_addr(tree, addr)
ipf_rdx_node_t *tree;
u_32_t *addr;
{
ipf_rdx_node_t *cur;
for (cur = tree; cur->index >= 0;) {
if (cur->bitmask & addr[cur->offset]) {
cur = cur->right;
} else {
cur = cur->left;
}
}
return (cur);
}
/* ------------------------------------------------------------------------ */
/* Function: ipf_rx_match */
/* Returns: ipf_rdx_node_t * - NULL on error, else pointer to the node */
/* added to the tree. */
/* Paramters: head(I) - pointer to tree head to search */
/* addr(I) - pointer to address to find */
/* */
/* Search the radix tree for the best match to the address pointed to by */
/* "addr" and return a pointer to that node. This search will not match the */
/* address information stored in either of the root leaves as neither of */
/* them are considered to be part of the tree of data being stored. */
/* ------------------------------------------------------------------------ */
static ipf_rdx_node_t *
ipf_rx_match(head, addr)
ipf_rdx_head_t *head;
addrfamily_t *addr;
{
ipf_rdx_mask_t *masknode;
ipf_rdx_node_t *prev;
ipf_rdx_node_t *node;
ipf_rdx_node_t *cur;
u_32_t *data;
u_32_t *mask;
u_32_t *key;
u_32_t *end;
int len;
int i;
len = addr->adf_len;
end = (u_32_t *)((u_char *)addr + len);
node = ipf_rx_find_addr(head->root, (u_32_t *)addr);
/*
* Search the dupkey list for a potential match.
*/
for (cur = node; (cur != NULL) && (cur->root == 0); cur = cur->dupkey) {
i = cur[0].addroff - cur[0].addrkey;
data = cur[0].addrkey + i;
mask = cur[0].maskkey + i;
key = (u_32_t *)addr + i;
for (; key < end; data++, key++, mask++)
if ((*key & *mask) != *data)
break;
if ((end == key) && (cur->root == 0))
return (cur); /* Equal keys */
}
prev = node->parent;
key = (u_32_t *)addr;
for (node = prev; node->root == 0; node = node->parent) {
/*
* We know that the node hasn't matched so therefore only
* the entries in the mask list are searched, not the top
* node nor the dupkey list.
*/
masknode = node->masks;
for (; masknode != NULL; masknode = masknode->next) {
if (masknode->maskbitcount > node->maskbitcount)
continue;
cur = masknode->node;
for (i = ADF_OFF >> 2; i <= node->offset; i++) {
if ((key[i] & masknode->mask[i]) ==
cur->addrkey[i])
return (cur);
}
}
}
return NULL;
}
/* ------------------------------------------------------------------------ */
/* Function: ipf_rx_lookup */
/* Returns: ipf_rdx_node_t * - NULL on error, else pointer to the node */
/* added to the tree. */
/* Paramters: head(I) - pointer to tree head to search */
/* addr(I) - address part of the key to match */
/* mask(I) - netmask part of the key to match */
/* */
/* ipf_rx_lookup searches for an exact match on (addr,mask). The intention */
/* is to see if a given key is in the tree, not to see if a route exists. */
/* ------------------------------------------------------------------------ */
ipf_rdx_node_t *
ipf_rx_lookup(head, addr, mask)
ipf_rdx_head_t *head;
addrfamily_t *addr, *mask;
{
ipf_rdx_node_t *found;
ipf_rdx_node_t *node;
u_32_t *akey;
int count;
found = ipf_rx_find_addr(head->root, (u_32_t *)addr);
if (found->root == 1)
return NULL;
/*
* It is possible to find a matching address in the tree but for the
* netmask to not match. If the netmask does not match and there is
* no list of alternatives present at dupkey, return a failure.
*/
count = count_mask_bits(mask, NULL);
if (count != found->maskbitcount && found->dupkey == NULL)
return (NULL);
akey = (u_32_t *)addr;
if ((found->addrkey[found->offset] & found->maskkey[found->offset]) !=
akey[found->offset])
return NULL;
if (found->dupkey != NULL) {
node = found;
while (node != NULL && node->maskbitcount != count)
node = node->dupkey;
if (node == NULL)
return (NULL);
found = node;
}
return found;
}
/* ------------------------------------------------------------------------ */
/* Function: ipf_rx_attach_mask */
/* Returns: Nil */
/* Parameters: node(I) - pointer to a radix tree node */
/* mask(I) - pointer to mask structure to add */
/* */
/* Add the netmask to the given node in an ordering where the most specific */
/* netmask is at the top of the list. */
/* ------------------------------------------------------------------------ */
static void
ipf_rx_attach_mask(node, mask)
ipf_rdx_node_t *node;
ipf_rdx_mask_t *mask;
{
ipf_rdx_mask_t **pm;
ipf_rdx_mask_t *m;
for (pm = &node->masks; (m = *pm) != NULL; pm = &m->next)
if (m->maskbitcount < mask->maskbitcount)
break;
mask->next = *pm;
*pm = mask;
}
/* ------------------------------------------------------------------------ */
/* Function: ipf_rx_insert */
/* Returns: ipf_rdx_node_t * - NULL on error, else pointer to the node */
/* added to the tree. */
/* Paramters: head(I) - pointer to tree head to add nodes to */
/* nodes(I) - pointer to radix nodes to be added */
/* dup(O) - set to 1 if node is a duplicate, else 0. */
/* */
/* Add the new radix tree entry that owns nodes[] to the tree given by head.*/
/* If there is already a matching key in the table, "dup" will be set to 1 */
/* and the existing node pointer returned if there is a complete key match. */
/* A complete key match is a matching of all key data that is presented by */
/* by the netmask. */
/* ------------------------------------------------------------------------ */
static ipf_rdx_node_t *
ipf_rx_insert(head, nodes, dup)
ipf_rdx_head_t *head;
ipf_rdx_node_t nodes[2];
int *dup;
{
ipf_rdx_mask_t **pmask;
ipf_rdx_node_t *node;
ipf_rdx_node_t *prev;
ipf_rdx_mask_t *mask;
ipf_rdx_node_t *cur;
u_32_t nodemask;
u_32_t *addr;
u_32_t *data;
int nodebits;
u_32_t *key;
u_32_t *end;
u_32_t bits;
int nodekey;
int nodeoff;
int nlen;
int len;
addr = nodes[0].addrkey;
node = ipf_rx_find_addr(head->root, addr);
len = ((addrfamily_t *)addr)->adf_len;
key = (u_32_t *)&((addrfamily_t *)addr)->adf_addr;
data= (u_32_t *)&((addrfamily_t *)node->addrkey)->adf_addr;
end = (u_32_t *)((u_char *)addr + len);
for (nlen = 0; key < end; data++, key++, nlen += 32)
if (*key != *data)
break;
if (end == data) {
*dup = 1;
return (node); /* Equal keys */
}
*dup = 0;
bits = (ntohl(*data) ^ ntohl(*key));
for (; bits != 0; nlen++) {
if ((bits & 0x80000000) != 0)
break;
bits <<= 1;
}
nlen += ADF_OFF_BITS;
nodes[1].index = nlen;
nodes[1].bitmask = htonl(0x80000000 >> (nlen & 0x1f));
nodes[0].offset = nlen / 32;
nodes[1].offset = nlen / 32;
/*
* Walk through the tree and look for the correct place to attach
* this node. ipf_rx_fin_addr is not used here because the place
* to attach this node may be an internal node (same key, different
* netmask.) Additionally, the depth of the search is forcibly limited
* here to not exceed the netmask, so that a short netmask will be
* added higher up the tree even if there are lower branches.
*/
cur = head->root;
key = nodes[0].addrkey;
do {
prev = cur;
if (key[cur->offset] & cur->bitmask) {
cur = cur->right;
} else {
cur = cur->left;
}
} while (nlen > (unsigned)cur->index);
if ((key[prev->offset] & prev->bitmask) == 0) {
prev->left = &nodes[1];
} else {
prev->right = &nodes[1];
}
cur->parent = &nodes[1];
nodes[1].parent = prev;
if ((key[nodes[1].offset] & nodes[1].bitmask) == 0) {
nodes[1].right = cur;
} else {
nodes[1].right = &nodes[0];
nodes[1].left = cur;
}
nodeoff = nodes[0].offset;
nodekey = nodes[0].addrkey[nodeoff];
nodemask = nodes[0].lastmask;
nodebits = nodes[0].maskbitcount;
prev = NULL;
/*
* Find the node up the tree with the largest pattern that still
* matches the node being inserted to see if this mask can be
* moved there.
*/
for (cur = nodes[1].parent; cur->root == 0; cur = cur->parent) {
if (cur->maskbitcount <= nodebits)
break;
if (((cur - 1)->addrkey[nodeoff] & nodemask) != nodekey)
break;
prev = cur;
}
KMALLOC(mask, ipf_rdx_mask_t *);
if (mask == NULL)
return NULL;
bzero(mask, sizeof(*mask));
mask->next = NULL;
mask->node = &nodes[0];
mask->maskbitcount = nodebits;
mask->mask = nodes[0].maskkey;
nodes[0].mymask = mask;
if (prev != NULL) {
ipf_rdx_mask_t *m;
for (pmask = &prev->masks; (m = *pmask) != NULL;
pmask = &m->next) {
if (m->maskbitcount < nodebits)
break;
}
} else {
/*
* No higher up nodes qualify, so attach mask locally.
*/
pmask = &nodes[0].masks;
}
mask->next = *pmask;
*pmask = mask;
/*
* Search the mask list on each child to see if there are any masks
* there that can be moved up to this newly inserted node.
*/
cur = nodes[1].right;
if (cur->root == 0) {
for (pmask = &cur->masks; (mask = *pmask) != NULL; ) {
if (mask->maskbitcount < nodebits) {
*pmask = mask->next;
ipf_rx_attach_mask(&nodes[0], mask);
} else {
pmask = &mask->next;
}
}
}
cur = nodes[1].left;
if (cur->root == 0 && cur != &nodes[0]) {
for (pmask = &cur->masks; (mask = *pmask) != NULL; ) {
if (mask->maskbitcount < nodebits) {
*pmask = mask->next;
ipf_rx_attach_mask(&nodes[0], mask);
} else {
pmask = &mask->next;
}
}
}
return (&nodes[0]);
}
/* ------------------------------------------------------------------------ */
/* Function: ipf_rx_addroute */
/* Returns: ipf_rdx_node_t * - NULL on error, else pointer to the node */
/* added to the tree. */
/* Paramters: head(I) - pointer to tree head to search */
/* addr(I) - address portion of "route" to add */
/* mask(I) - netmask portion of "route" to add */
/* nodes(I) - radix tree data nodes inside allocate structure */
/* */
/* Attempt to add a node to the radix tree. The key for the node is the */
/* (addr,mask). No memory allocation for the radix nodes themselves is */
/* performed here, the data structure that this radix node is being used to */
/* find is expected to house the node data itself however the call to */
/* ipf_rx_insert() will attempt to allocate memory in order for netmask to */
/* be promoted further up the tree. */
/* In this case, the ip_pool_node_t structure from ip_pool.h contains both */
/* the key material (addr,mask) and the radix tree nodes[]. */
/* */
/* The mechanics of inserting the node into the tree is handled by the */
/* function ipf_rx_insert() above. Here, the code deals with the case */
/* where the data to be inserted is a duplicate. */
/* ------------------------------------------------------------------------ */
ipf_rdx_node_t *
ipf_rx_addroute(head, addr, mask, nodes)
ipf_rdx_head_t *head;
addrfamily_t *addr, *mask;
ipf_rdx_node_t *nodes;
{
ipf_rdx_node_t *node;
ipf_rdx_node_t *prev;
ipf_rdx_node_t *x;
int dup;
buildnodes(addr, mask, nodes);
x = ipf_rx_insert(head, nodes, &dup);
if (x == NULL)
return NULL;
if (dup == 1) {
node = &nodes[0];
prev = NULL;
/*
* The duplicate list is kept sorted with the longest
* mask at the top, meaning that the most specific entry
* in the listis found first. This list thus allows for
* duplicates such as 128.128.0.0/32 and 128.128.0.0/16.
*/
while ((x != NULL) && (x->maskbitcount > node->maskbitcount)) {
prev = x;
x = x->dupkey;
}
/*
* Is it a complete duplicate? If so, return NULL and
* fail the insert. Otherwise, insert it into the list
* of netmasks active for this key.
*/
if ((x != NULL) && (x->maskbitcount == node->maskbitcount))
return (NULL);
if (prev != NULL) {
nodes[0].dupkey = x;
prev->dupkey = &nodes[0];
nodes[0].parent = prev;
if (x != NULL)
x->parent = &nodes[0];
} else {
nodes[0].dupkey = x->dupkey;
prev = x->parent;
nodes[0].parent = prev;
x->parent = &nodes[0];
if (prev->left == x)
prev->left = &nodes[0];
else
prev->right = &nodes[0];
}
}
return &nodes[0];
}
/* ------------------------------------------------------------------------ */
/* Function: ipf_rx_delete */
/* Returns: ipf_rdx_node_t * - NULL on error, else node removed from */
/* the tree. */
/* Paramters: head(I) - pointer to tree head to search */
/* addr(I) - pointer to the address part of the key */
/* mask(I) - pointer to the netmask part of the key */
/* */
/* Search for an entry in the radix tree that is an exact match for (addr, */
/* mask) and remove it if it exists. In the case where (addr,mask) is a not */
/* a unique key, the tree structure itself is not changed - only the list */
/* of duplicate keys. */
/* ------------------------------------------------------------------------ */
ipf_rdx_node_t *
ipf_rx_delete(head, addr, mask)
ipf_rdx_head_t *head;
addrfamily_t *addr, *mask;
{
ipf_rdx_mask_t **pmask;
ipf_rdx_node_t *parent;
ipf_rdx_node_t *found;
ipf_rdx_node_t *prev;
ipf_rdx_node_t *node;
ipf_rdx_node_t *cur;
ipf_rdx_mask_t *m;
int count;
found = ipf_rx_find_addr(head->root, (u_32_t *)addr);
if (found == NULL)
return NULL;
if (found->root == 1)
return NULL;
count = count_mask_bits(mask, NULL);
parent = found->parent;
if (found->dupkey != NULL) {
node = found;
while (node != NULL && node->maskbitcount != count)
node = node->dupkey;
if (node == NULL)
return (NULL);
if (node != found) {
/*
* Remove from the dupkey list. Here, "parent" is
* the previous node on the list (rather than tree)
* and "dupkey" is the next node on the list.
*/
parent = node->parent;
parent->dupkey = node->dupkey;
node->dupkey->parent = parent;
} else {
/*
*
* When removing the top node of the dupkey list,
* the pointers at the top of the list that point
* to other tree nodes need to be preserved and
* any children must have their parent updated.
*/
node = node->dupkey;
node->parent = found->parent;
node->right = found->right;
node->left = found->left;
found->right->parent = node;
found->left->parent = node;
if (parent->left == found)
parent->left = node;
else
parent->right= node;
}
} else {
if (count != found->maskbitcount)
return (NULL);
/*
* Remove the node from the tree and reconnect the subtree
* below.
*/
/*
* If there is a tree to the left, look for something to
* attach in place of "found".
*/
prev = found + 1;
cur = parent->parent;
if (parent != found + 1) {
if ((found + 1)->parent->right == found + 1)
(found + 1)->parent->right = parent;
else
(found + 1)->parent->left = parent;
if (cur->right == parent) {
if (parent->left == found) {
cur->right = parent->right;
} else if (parent->left != parent - 1) {
cur->right = parent->left;
} else {
cur->right = parent - 1;
}
cur->right->parent = cur;
} else {
if (parent->right == found) {
cur->left = parent->left;
} else if (parent->right != parent - 1) {
cur->left = parent->right;
} else {
cur->left = parent - 1;
}
cur->left->parent = cur;
}
parent->left = (found + 1)->left;
if ((found + 1)->right != parent)
parent->right = (found + 1)->right;
parent->left->parent = parent;
parent->right->parent = parent;
parent->parent = (found + 1)->parent;
parent->bitmask = prev->bitmask;
parent->offset = prev->offset;
parent->index = prev->index;
} else {
/*
* We found an edge node.
*/
cur = parent->parent;
if (cur->left == parent) {
if (parent->left == found) {
cur->left = parent->right;
parent->right->parent = cur;
} else {
cur->left = parent->left;
parent->left->parent = cur;
}
} else {
if (parent->right != found) {
cur->right = parent->right;
parent->right->parent = cur;
} else {
cur->right = parent->left;
prev->left->parent = cur;
}
}
}
}
/*
* Remove mask associated with this node.
*/
for (cur = parent; cur->root == 0; cur = cur->parent) {
ipf_rdx_mask_t **pm;
if (cur->maskbitcount <= found->maskbitcount)
break;
if (((cur - 1)->addrkey[found->offset] & found->bitmask) !=
found->addrkey[found->offset])
break;
for (pm = &cur->masks; (m = *pm) != NULL; )
if (m->node == cur) {
*pm = m->next;
break;
} else {
pm = &m->next;
}
}
KFREE(found->mymask);
/*
* Masks that have been brought up to this node from below need to
* be sent back down.
*/
for (pmask = &parent->masks; (m = *pmask) != NULL; ) {
*pmask = m->next;
cur = m->node;
if (cur == found)
continue;
if (found->addrkey[cur->offset] & cur->lastmask) {
ipf_rx_attach_mask(parent->right, m);
} else if (parent->left != found) {
ipf_rx_attach_mask(parent->left, m);
}
}
return (found);
}
/* ------------------------------------------------------------------------ */
/* Function: ipf_rx_walktree */
/* Returns: Nil */
/* Paramters: head(I) - pointer to tree head to search */
/* walker(I) - function to call for each node in the tree */
/* arg(I) - parameter to pass to walker, in addition to the */
/* node pointer */
/* */
/* A standard tree walking function except that it is iterative, rather */
/* than recursive and tracks the next node in case the "walker" function */
/* should happen to delete and free the current node. It thus goes without */
/* saying that the "walker" function is not permitted to cause any change */
/* in the validity of the data found at either the left or right child. */
/* ------------------------------------------------------------------------ */
void
ipf_rx_walktree(head, walker, arg)
ipf_rdx_head_t *head;
radix_walk_func_t walker;
void *arg;
{
ipf_rdx_node_t *next;
ipf_rdx_node_t *node = head->root;
ipf_rdx_node_t *base;
while (node->index >= 0)
node = node->left;
for (;;) {
base = node;
while ((node->parent->right == node) && (node->root == 0))
node = node->parent;
for (node = node->parent->right; node->index >= 0; )
node = node->left;
next = node;
for (node = base; node != NULL; node = base) {
base = node->dupkey;
if (node->root == 0)
walker(node, arg);
}
node = next;
if (node->root)
return;
}
}
/* ------------------------------------------------------------------------ */
/* Function: ipf_rx_inithead */
/* Returns: int - 0 = success, else failure */
/* Paramters: softr(I) - pointer to radix context */
/* headp(O) - location for where to store allocated tree head */
/* */
/* This function allocates and initialises a radix tree head structure. */
/* As a traditional radix tree, node 0 is used as the "0" sentinel and node */
/* "2" is used as the all ones sentinel, leaving node "1" as the root from */
/* which the tree is hung with node "0" on its left and node "2" to the */
/* right. The context, "softr", is used here to provide a common source of */
/* the zeroes and ones data rather than have one per head. */
/* ------------------------------------------------------------------------ */
int
ipf_rx_inithead(softr, headp)
radix_softc_t *softr;
ipf_rdx_head_t **headp;
{
ipf_rdx_head_t *ptr;
ipf_rdx_node_t *node;
KMALLOC(ptr, ipf_rdx_head_t *);
*headp = ptr;
if (ptr == NULL)
return -1;
bzero(ptr, sizeof(*ptr));
node = ptr->nodes;
ptr->root = node + 1;
node[0].index = ADF_OFF_BITS;
node[0].index = -1 - node[0].index;
node[1].index = ADF_OFF_BITS;
node[2].index = node[0].index;
node[0].parent = node + 1;
node[1].parent = node + 1;
node[2].parent = node + 1;
node[1].bitmask = htonl(0x80000000);
node[0].root = 1;
node[1].root = 1;
node[2].root = 1;
node[0].offset = ADF_OFF_BITS >> 5;
node[1].offset = ADF_OFF_BITS >> 5;
node[2].offset = ADF_OFF_BITS >> 5;
node[1].left = &node[0];
node[1].right = &node[2];
node[0].addrkey = (u_32_t *)softr->zeros;
node[2].addrkey = (u_32_t *)softr->ones;
#ifdef RDX_DEBUG
(void) strcpy(node[0].name, "0_ROOT");
(void) strcpy(node[1].name, "1_ROOT");
(void) strcpy(node[2].name, "2_ROOT");
#endif
ptr->addaddr = ipf_rx_addroute;
ptr->deladdr = ipf_rx_delete;
ptr->lookup = ipf_rx_lookup;
ptr->matchaddr = ipf_rx_match;
ptr->walktree = ipf_rx_walktree;
return 0;
}
/* ------------------------------------------------------------------------ */
/* Function: ipf_rx_freehead */
/* Returns: Nil */
/* Paramters: head(I) - pointer to tree head to free */
/* */
/* This function simply free's up the radix tree head. Prior to calling */
/* this function, it is expected that the tree will have been emptied. */
/* ------------------------------------------------------------------------ */
void
ipf_rx_freehead(head)
ipf_rdx_head_t *head;
{
KFREE(head);
}
/* ------------------------------------------------------------------------ */
/* Function: ipf_rx_create */
/* Parameters: Nil */
/* */
/* ------------------------------------------------------------------------ */
void *
ipf_rx_create()
{
radix_softc_t *softr;
KMALLOC(softr, radix_softc_t *);
if (softr == NULL)
return NULL;
bzero((char *)softr, sizeof(*softr));
KMALLOCS(softr->zeros, u_char *, 3 * sizeof(addrfamily_t));
if (softr->zeros == NULL) {
KFREE(softr);
return (NULL);
}
softr->ones = softr->zeros + sizeof(addrfamily_t);
return softr;
}
/* ------------------------------------------------------------------------ */
/* Function: ipf_rx_init */
/* Returns: int - 0 = success (always) */
/* */
/* ------------------------------------------------------------------------ */
int
ipf_rx_init(ctx)
void *ctx;
{
radix_softc_t *softr = ctx;
memset(softr->zeros, 0, 3 * sizeof(addrfamily_t));
memset(softr->ones, 0xff, sizeof(addrfamily_t));
return (0);
}
/* ------------------------------------------------------------------------ */
/* Function: ipf_rx_destroy */
/* Returns: Nil */
/* */
/* ------------------------------------------------------------------------ */
void
ipf_rx_destroy(ctx)
void *ctx;
{
radix_softc_t *softr = ctx;
if (softr->zeros != NULL)
KFREES(softr->zeros, 3 * sizeof(addrfamily_t));
KFREE(softr);
}
/* ====================================================================== */
#ifdef RDX_DEBUG
/*
* To compile this file as a standalone test unit, use -DRDX_DEBUG=1
*/
#define NAME(x) ((x)->index < 0 ? (x)->name : (x)->name)
#define GNAME(y) ((y) == NULL ? "NULL" : NAME(y))
typedef struct myst {
struct ipf_rdx_node nodes[2];
addrfamily_t dst;
addrfamily_t mask;
struct myst *next;
int printed;
} myst_t;
typedef struct tabe_s {
char *host;
char *mask;
char *what;
} tabe_t;
tabe_t builtin[] = {
#if 1
{ "192:168:100::0", "48", "d" },
{ "192:168:100::2", "128", "d" },
#else
{ "127.192.0.0", "255.255.255.0", "d" },
{ "127.128.0.0", "255.255.255.0", "d" },
{ "127.96.0.0", "255.255.255.0", "d" },
{ "127.80.0.0", "255.255.255.0", "d" },
{ "127.72.0.0", "255.255.255.0", "d" },
{ "127.64.0.0", "255.255.255.0", "d" },
{ "127.56.0.0", "255.255.255.0", "d" },
{ "127.48.0.0", "255.255.255.0", "d" },
{ "127.40.0.0", "255.255.255.0", "d" },
{ "127.32.0.0", "255.255.255.0", "d" },
{ "127.24.0.0", "255.255.255.0", "d" },
{ "127.16.0.0", "255.255.255.0", "d" },
{ "127.8.0.0", "255.255.255.0", "d" },
{ "124.0.0.0", "255.0.0.0", "d" },
{ "125.0.0.0", "255.0.0.0", "d" },
{ "126.0.0.0", "255.0.0.0", "d" },
{ "127.0.0.0", "255.0.0.0", "d" },
{ "10.0.0.0", "255.0.0.0", "d" },
{ "128.250.0.0", "255.255.0.0", "d" },
{ "192.168.0.0", "255.255.0.0", "d" },
{ "192.168.1.0", "255.255.255.0", "d" },
#endif
{ NULL, NULL, NULL }
};
char *mtable[][1] = {
#if 1
{ "192:168:100::2" },
{ "192:168:101::2" },
#else
{ "9.0.0.0" },
{ "9.0.0.1" },
{ "11.0.0.0" },
{ "11.0.0.1" },
{ "127.0.0.1" },
{ "127.0.1.0" },
{ "255.255.255.0" },
{ "126.0.0.1" },
{ "128.251.0.0" },
{ "128.251.0.1" },
{ "128.251.255.255" },
{ "129.250.0.0" },
{ "129.250.0.1" },
{ "192.168.255.255" },
#endif
{ NULL }
};
int forder[22] = {
14, 13, 12, 5, 10, 3, 19, 7, 4, 20, 8,
2, 17, 9, 16, 11, 15, 1, 6, 18, 0, 21
};
static int nodecount = 0;
myst_t *myst_top = NULL;
tabe_t *ttable = NULL;
void add_addr(ipf_rdx_head_t *, int , int);
void checktree(ipf_rdx_head_t *);
void delete_addr(ipf_rdx_head_t *rnh, int item);
void dumptree(ipf_rdx_head_t *rnh);
void nodeprinter(ipf_rdx_node_t *, void *);
void printroots(ipf_rdx_head_t *);
void random_add(ipf_rdx_head_t *);
void random_delete(ipf_rdx_head_t *);
void test_addr(ipf_rdx_head_t *rnh, int pref, addrfamily_t *, int);
static void
ipf_rx_freenode(node, arg)
ipf_rdx_node_t *node;
void *arg;
{
ipf_rdx_head_t *head = arg;
ipf_rdx_node_t *rv;
myst_t *stp;
stp = (myst_t *)node;
rv = ipf_rx_delete(head, &stp->dst, &stp->mask);
if (rv != NULL) {
free(rv);
}
}
const char *
addrname(ap)
addrfamily_t *ap;
{
static char name[80];
const char *txt;
bzero((char *)name, sizeof(name));
txt = inet_ntop(ap->adf_family, &ap->adf_addr, name,
sizeof(name));
return txt;
}
void
fill6bits(bits, msk)
int bits;
u_int *msk;
{
if (bits == 0) {
msk[0] = 0;
msk[1] = 0;
msk[2] = 0;
msk[3] = 0;
return;
}
msk[0] = 0xffffffff;
msk[1] = 0xffffffff;
msk[2] = 0xffffffff;
msk[3] = 0xffffffff;
if (bits == 128)
return;
if (bits > 96) {
msk[3] = htonl(msk[3] << (128 - bits));
} else if (bits > 64) {
msk[3] = 0;
msk[2] = htonl(msk[2] << (96 - bits));
} else if (bits > 32) {
msk[3] = 0;
msk[2] = 0;
msk[1] = htonl(msk[1] << (64 - bits));
} else {
msk[3] = 0;
msk[2] = 0;
msk[1] = 0;
msk[0] = htonl(msk[0] << (32 - bits));
}
}
void
setaddr(afp, str)
addrfamily_t *afp;
char *str;
{
bzero((char *)afp, sizeof(*afp));
if (strchr(str, ':') == NULL) {
afp->adf_family = AF_INET;
afp->adf_len = offsetof(addrfamily_t, adf_addr) + 4;
} else {
afp->adf_family = AF_INET6;
afp->adf_len = offsetof(addrfamily_t, adf_addr) + 16;
}
inet_pton(afp->adf_family, str, &afp->adf_addr);
}
void
setmask(afp, str)
addrfamily_t *afp;
char *str;
{
if (strchr(str, '.') != NULL) {
afp->adf_addr.in4.s_addr = inet_addr(str);
afp->adf_len = offsetof(addrfamily_t, adf_addr) + 4;
} else if (afp->adf_family == AF_INET) {
afp->adf_addr.i6[0] = htonl(0xffffffff << (32 - atoi(str)));
afp->adf_len = offsetof(addrfamily_t, adf_addr) + 4;
} else if (afp->adf_family == AF_INET6) {
fill6bits(atoi(str), afp->adf_addr.i6);
afp->adf_len = offsetof(addrfamily_t, adf_addr) + 16;
}
}
void
nodeprinter(node, arg)
ipf_rdx_node_t *node;
void *arg;
{
myst_t *stp = (myst_t *)node;
printf("Node %-9.9s L %-9.9s R %-9.9s P %9.9s/%-9.9s %s/%d\n",
node[0].name,
GNAME(node[1].left), GNAME(node[1].right),
GNAME(node[0].parent), GNAME(node[1].parent),
addrname(&stp->dst), node[0].maskbitcount);
if (stp->printed == -1)
printf("!!! %d\n", stp->printed);
else
stp->printed = 1;
}
void
printnode(stp)
myst_t *stp;
{
ipf_rdx_node_t *node = &stp->nodes[0];
if (stp->nodes[0].index > 0)
stp = (myst_t *)&stp->nodes[-1];
printf("Node %-9.9s ", node[0].name);
printf("L %-9.9s ", GNAME(node[1].left));
printf("R %-9.9s ", GNAME(node[1].right));
printf("P %9.9s", GNAME(node[0].parent));
printf("/%-9.9s ", GNAME(node[1].parent));
printf("%s P%d\n", addrname(&stp->dst), stp->printed);
}
void
buildtab(void)
{
char line[80], *s;
tabe_t *tab;
int lines;
FILE *fp;
lines = 0;
fp = fopen("hosts", "r");
while (fgets(line, sizeof(line), fp) != NULL) {
s = strchr(line, '\n');
if (s != NULL)
*s = '\0';
lines++;
if (lines == 1)
tab = malloc(sizeof(*tab) * 2);
else
tab = realloc(tab, (lines + 1) * sizeof(*tab));
tab[lines - 1].host = strdup(line);
s = strchr(tab[lines - 1].host, '/');
*s++ = '\0';
tab[lines - 1].mask = s;
tab[lines - 1].what = "d";
}
fclose(fp);
tab[lines].host = NULL;
tab[lines].mask = NULL;
tab[lines].what = NULL;
ttable = tab;
}
void
printroots(rnh)
ipf_rdx_head_t *rnh;
{
printf("Root.0.%s b %3d p %-9.9s l %-9.9s r %-9.9s\n",
GNAME(&rnh->nodes[0]),
rnh->nodes[0].index, GNAME(rnh->nodes[0].parent),
GNAME(rnh->nodes[0].left), GNAME(rnh->nodes[0].right));
printf("Root.1.%s b %3d p %-9.9s l %-9.9s r %-9.9s\n",
GNAME(&rnh->nodes[1]),
rnh->nodes[1].index, GNAME(rnh->nodes[1].parent),
GNAME(rnh->nodes[1].left), GNAME(rnh->nodes[1].right));
printf("Root.2.%s b %3d p %-9.9s l %-9.9s r %-9.9s\n",
GNAME(&rnh->nodes[2]),
rnh->nodes[2].index, GNAME(rnh->nodes[2].parent),
GNAME(rnh->nodes[2].left), GNAME(rnh->nodes[2].right));
}
int
main(int argc, char *argv[])
{
addrfamily_t af;
ipf_rdx_head_t *rnh;
radix_softc_t *ctx;
int j;
int i;
rnh = NULL;
buildtab();
ctx = ipf_rx_create();
ipf_rx_init(ctx);
ipf_rx_inithead(ctx, &rnh);
printf("=== ADD-0 ===\n");
for (i = 0; ttable[i].host != NULL; i++) {
add_addr(rnh, i, i);
checktree(rnh);
}
printroots(rnh);
ipf_rx_walktree(rnh, nodeprinter, NULL);
printf("=== DELETE-0 ===\n");
for (i = 0; ttable[i].host != NULL; i++) {
delete_addr(rnh, i);
printroots(rnh);
ipf_rx_walktree(rnh, nodeprinter, NULL);
}
printf("=== ADD-1 ===\n");
for (i = 0; ttable[i].host != NULL; i++) {
setaddr(&af, ttable[i].host);
add_addr(rnh, i, i); /*forder[i]); */
checktree(rnh);
}
dumptree(rnh);
ipf_rx_walktree(rnh, nodeprinter, NULL);
printf("=== TEST-1 ===\n");
for (i = 0; ttable[i].host != NULL; i++) {
setaddr(&af, ttable[i].host);
test_addr(rnh, i, &af, -1);
}
printf("=== TEST-2 ===\n");
for (i = 0; mtable[i][0] != NULL; i++) {
setaddr(&af, mtable[i][0]);
test_addr(rnh, i, &af, -1);
}
printf("=== DELETE-1 ===\n");
for (i = 0; ttable[i].host != NULL; i++) {
if (ttable[i].what[0] != 'd')
continue;
delete_addr(rnh, i);
for (j = 0; ttable[j].host != NULL; j++) {
setaddr(&af, ttable[j].host);
test_addr(rnh, i, &af, 3);
}
printroots(rnh);
ipf_rx_walktree(rnh, nodeprinter, NULL);
}
dumptree(rnh);
printf("=== ADD-2 ===\n");
random_add(rnh);
checktree(rnh);
dumptree(rnh);
ipf_rx_walktree(rnh, nodeprinter, NULL);
printf("=== DELETE-2 ===\n");
random_delete(rnh);
checktree(rnh);
dumptree(rnh);
ipf_rx_walktree(rnh, ipf_rx_freenode, rnh);
return 0;
}
void
dumptree(rnh)
ipf_rdx_head_t *rnh;
{
myst_t *stp;
printf("VVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVV\n");
printroots(rnh);
for (stp = myst_top; stp; stp = stp->next)
printnode(stp);
printf("^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n");
}
void
test_addr(rnh, pref, addr, limit)
ipf_rdx_head_t *rnh;
int pref;
addrfamily_t *addr;
{
static int extras[14] = { 0, -1, 1, 3, 5, 8, 9,
15, 16, 19, 255, 256, 65535, 65536
};
ipf_rdx_node_t *rn;
addrfamily_t af;
char name[80];
myst_t *stp;
int i;
memset(&af, 0, sizeof(af));
#if 0
if (limit < 0 || limit > 14)
limit = 14;
for (i = 0; i < limit; i++) {
if (ttable[i].host == NULL)
break;
setaddr(&af, ttable[i].host);
printf("%d.%d.LOOKUP(%s)", pref, i, addrname(&af));
rn = ipf_rx_match(rnh, &af);
stp = (myst_t *)rn;
printf(" = %s (%s/%d)\n", GNAME(rn),
rn ? addrname(&stp->dst) : "NULL",
rn ? rn->maskbitcount : 0);
}
#else
printf("%d.%d.LOOKUP(%s)", pref, -1, addrname(addr));
rn = ipf_rx_match(rnh, addr);
stp = (myst_t *)rn;
printf(" = %s (%s/%d)\n", GNAME(rn),
rn ? addrname(&stp->dst) : "NULL", rn ? rn->maskbitcount : 0);
#endif
}
void
delete_addr(rnh, item)
ipf_rdx_head_t *rnh;
int item;
{
ipf_rdx_node_t *rn;
addrfamily_t mask;
addrfamily_t af;
myst_t **pstp;
myst_t *stp;
memset(&af, 0, sizeof(af));
memset(&mask, 0, sizeof(mask));
setaddr(&af, ttable[item].host);
mask.adf_family = af.adf_family;
setmask(&mask, ttable[item].mask);
printf("DELETE(%s)\n", addrname(&af));
rn = ipf_rx_delete(rnh, &af, &mask);
if (rn == NULL) {
printf("FAIL LOOKUP DELETE\n");
checktree(rnh);
for (stp = myst_top; stp != NULL; stp = stp->next)
if (stp->printed != -1)
stp->printed = -2;
ipf_rx_walktree(rnh, nodeprinter, NULL);
dumptree(rnh);
abort();
}
printf("%d.delete(%s) = %s\n", item, addrname(&af), GNAME(rn));
for (pstp = &myst_top; (stp = *pstp) != NULL; pstp = &stp->next)
if (stp == (myst_t *)rn)
break;
stp->printed = -1;
stp->nodes[0].parent = &stp->nodes[0];
stp->nodes[1].parent = &stp->nodes[1];
*pstp = stp->next;
free(stp);
nodecount--;
checktree(rnh);
}
void
add_addr(rnh, n, item)
ipf_rdx_head_t *rnh;
int n, item;
{
ipf_rdx_node_t *rn;
myst_t *stp;
stp = calloc(1, sizeof(*stp));
rn = (ipf_rdx_node_t *)stp;
setaddr(&stp->dst, ttable[item].host);
stp->mask.adf_family = stp->dst.adf_family;
setmask(&stp->mask, ttable[item].mask);
stp->next = myst_top;
myst_top = stp;
(void) sprintf(rn[0].name, "_BORN.0");
(void) sprintf(rn[1].name, "_BORN.1");
rn = ipf_rx_addroute(rnh, &stp->dst, &stp->mask, stp->nodes);
(void) sprintf(rn[0].name, "%d_NODE.0", item);
(void) sprintf(rn[1].name, "%d_NODE.1", item);
printf("ADD %d/%d %s/%s\n", n, item, rn[0].name, rn[1].name);
nodecount++;
checktree(rnh);
}
void
checktree(ipf_rdx_head_t *head)
{
myst_t *s1;
ipf_rdx_node_t *rn;
if (nodecount <= 1)
return;
for (s1 = myst_top; s1 != NULL; s1 = s1->next) {
int fault = 0;
if (s1->printed == -1)
continue;
rn = &s1->nodes[1];
if (rn->right->parent != rn)
fault |= 1;
if (rn->left->parent != rn)
fault |= 2;
if (rn->parent->left != rn && rn->parent->right != rn)
fault |= 4;
if (fault != 0) {
printf("FAULT %#x %s\n", fault, rn->name);
dumptree(head);
ipf_rx_walktree(head, nodeprinter, NULL);
fflush(stdout);
fflush(stderr);
printf("--\n");
abort();
}
}
}
int *
randomize(int *pnitems)
{
int *order;
int nitems;
int choice;
int j;
int i;
nitems = sizeof(ttable) / sizeof(ttable[0]);
*pnitems = nitems;
order = calloc(nitems, sizeof(*order));
srandom(getpid() * time(NULL));
memset(order, 0xff, nitems * sizeof(*order));
order[21] = 21;
for (i = 0; i < nitems - 1; i++) {
do {
choice = rand() % (nitems - 1);
for (j = 0; j < nitems; j++)
if (order[j] == choice)
break;
} while (j != nitems);
order[i] = choice;
}
return order;
}
void
random_add(rnh)
ipf_rdx_head_t *rnh;
{
int *order;
int nitems;
int i;
order = randomize(&nitems);
for (i = 0; i < nitems - 1; i++) {
add_addr(rnh, i, order[i]);
checktree(rnh);
}
}
void
random_delete(rnh)
ipf_rdx_head_t *rnh;
{
int *order;
int nitems;
int i;
order = randomize(&nitems);
for (i = 0; i < nitems - 1; i++) {
delete_addr(rnh, i);
checktree(rnh);
}
}
#endif /* RDX_DEBUG */