889 lines
23 KiB
C
889 lines
23 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1988, 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)radix.c 8.4 (Berkeley) 11/2/94
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*/
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/*
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* Routines to build and maintain radix trees for routing lookups.
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*/
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#include "defs.h"
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#define log(x, msg) syslog(x, msg)
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#define panic(s) {log(LOG_ERR,s); exit(1);}
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#define min(a,b) (((a)<(b))?(a):(b))
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int max_keylen;
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static struct radix_mask *rn_mkfreelist;
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static struct radix_node_head *mask_rnhead;
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static char *addmask_key;
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static const uint8_t normal_chars[] =
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{ 0, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff};
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static char *rn_zeros, *rn_ones;
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#define rn_masktop (mask_rnhead->rnh_treetop)
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#define Bcmp(a, b, l) (l == 0 ? 0 \
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: memcmp((caddr_t)(a), (caddr_t)(b), (size_t)l))
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static int rn_satisfies_leaf(char *, struct radix_node *, int);
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static struct radix_node *rn_addmask(void *n_arg, int search, int skip);
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static struct radix_node *rn_addroute(void *v_arg, void *n_arg,
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struct radix_node_head *head, struct radix_node treenodes[2]);
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static struct radix_node *rn_match(void *v_arg, struct radix_node_head *head);
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/*
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* The data structure for the keys is a radix tree with one way
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* branching removed. The index rn_b at an internal node n represents a bit
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* position to be tested. The tree is arranged so that all descendants
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* of a node n have keys whose bits all agree up to position rn_b - 1.
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* (We say the index of n is rn_b.)
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*
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* There is at least one descendant which has a one bit at position rn_b,
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* and at least one with a zero there.
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*
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* A route is determined by a pair of key and mask. We require that the
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* bit-wise logical and of the key and mask to be the key.
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* We define the index of a route to associated with the mask to be
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* the first bit number in the mask where 0 occurs (with bit number 0
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* representing the highest order bit).
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*
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* We say a mask is normal if every bit is 0, past the index of the mask.
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* If a node n has a descendant (k, m) with index(m) == index(n) == rn_b,
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* and m is a normal mask, then the route applies to every descendant of n.
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* If the index(m) < rn_b, this implies the trailing last few bits of k
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* before bit b are all 0, (and hence consequently true of every descendant
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* of n), so the route applies to all descendants of the node as well.
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*
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* Similar logic shows that a non-normal mask m such that
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* index(m) <= index(n) could potentially apply to many children of n.
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* Thus, for each non-host route, we attach its mask to a list at an internal
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* node as high in the tree as we can go.
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*
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* The present version of the code makes use of normal routes in short-
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* circuiting an explicit mask and compare operation when testing whether
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* a key satisfies a normal route, and also in remembering the unique leaf
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* that governs a subtree.
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*/
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static struct radix_node *
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rn_search(void *v_arg,
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struct radix_node *head)
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{
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struct radix_node *x;
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caddr_t v;
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for (x = head, v = v_arg; x->rn_b >= 0;) {
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if (x->rn_bmask & v[x->rn_off])
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x = x->rn_r;
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else
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x = x->rn_l;
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}
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return (x);
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}
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static struct radix_node *
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rn_search_m(void *v_arg,
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struct radix_node *head,
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void *m_arg)
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{
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struct radix_node *x;
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caddr_t v = v_arg, m = m_arg;
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for (x = head; x->rn_b >= 0;) {
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if ((x->rn_bmask & m[x->rn_off]) &&
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(x->rn_bmask & v[x->rn_off]))
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x = x->rn_r;
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else
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x = x->rn_l;
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}
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return x;
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}
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static int
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rn_refines(void* m_arg, void *n_arg)
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{
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caddr_t m = m_arg, n = n_arg;
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caddr_t lim, lim2 = lim = n + *(u_char *)n;
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int longer = (*(u_char *)n++) - (int)(*(u_char *)m++);
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int masks_are_equal = 1;
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if (longer > 0)
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lim -= longer;
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while (n < lim) {
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if (*n & ~(*m))
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return 0;
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if (*n++ != *m++)
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masks_are_equal = 0;
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}
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while (n < lim2)
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if (*n++)
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return 0;
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if (masks_are_equal && (longer < 0))
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for (lim2 = m - longer; m < lim2; )
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if (*m++)
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return 1;
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return (!masks_are_equal);
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}
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static struct radix_node *
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rn_lookup(void *v_arg, void *m_arg, struct radix_node_head *head)
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{
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struct radix_node *x;
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caddr_t netmask = 0;
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if (m_arg) {
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if ((x = rn_addmask(m_arg, 1,
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head->rnh_treetop->rn_off)) == NULL)
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return (0);
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netmask = x->rn_key;
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}
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x = rn_match(v_arg, head);
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if (x && netmask) {
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while (x && x->rn_mask != netmask)
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x = x->rn_dupedkey;
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}
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return x;
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}
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static int
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rn_satisfies_leaf(char *trial,
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struct radix_node *leaf,
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int skip)
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{
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char *cp = trial, *cp2 = leaf->rn_key, *cp3 = leaf->rn_mask;
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char *cplim;
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int length = min(*(u_char *)cp, *(u_char *)cp2);
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if (cp3 == NULL)
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cp3 = rn_ones;
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else
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length = min(length, *(u_char *)cp3);
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cplim = cp + length; cp3 += skip; cp2 += skip;
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for (cp += skip; cp < cplim; cp++, cp2++, cp3++)
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if ((*cp ^ *cp2) & *cp3)
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return 0;
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return 1;
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}
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static struct radix_node *
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rn_match(void *v_arg,
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struct radix_node_head *head)
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{
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caddr_t v = v_arg;
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struct radix_node *t = head->rnh_treetop, *x;
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caddr_t cp = v, cp2;
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caddr_t cplim;
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struct radix_node *saved_t, *top = t;
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int off = t->rn_off, vlen = *(u_char *)cp, matched_off;
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int test, b, rn_b;
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/*
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* Open code rn_search(v, top) to avoid overhead of extra
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* subroutine call.
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*/
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for (; t->rn_b >= 0; ) {
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if (t->rn_bmask & cp[t->rn_off])
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t = t->rn_r;
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else
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t = t->rn_l;
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}
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/*
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* See if we match exactly as a host destination
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* or at least learn how many bits match, for normal mask finesse.
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*
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* It doesn't hurt us to limit how many bytes to check
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* to the length of the mask, since if it matches we had a genuine
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* match and the leaf we have is the most specific one anyway;
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* if it didn't match with a shorter length it would fail
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* with a long one. This wins big for class B&C netmasks which
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* are probably the most common case...
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*/
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if (t->rn_mask)
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vlen = *(u_char *)t->rn_mask;
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cp += off; cp2 = t->rn_key + off; cplim = v + vlen;
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for (; cp < cplim; cp++, cp2++)
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if (*cp != *cp2)
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goto on1;
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/*
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* This extra grot is in case we are explicitly asked
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* to look up the default. Ugh!
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* Or 255.255.255.255
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*
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* In this case, we have a complete match of the key. Unless
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* the node is one of the roots, we are finished.
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* If it is the zeros root, then take what we have, preferring
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* any real data.
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* If it is the ones root, then pretend the target key was followed
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* by a byte of zeros.
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*/
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if (!(t->rn_flags & RNF_ROOT))
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return t; /* not a root */
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if (t->rn_dupedkey) {
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t = t->rn_dupedkey;
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return t; /* have some real data */
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}
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if (*(cp-1) == 0)
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return t; /* not the ones root */
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b = 0; /* fake a zero after 255.255.255.255 */
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goto on2;
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on1:
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test = (*cp ^ *cp2) & 0xff; /* find first bit that differs */
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for (b = 7; (test >>= 1) > 0;)
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b--;
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on2:
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matched_off = cp - v;
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b += matched_off << 3;
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rn_b = -1 - b;
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/*
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* If there is a host route in a duped-key chain, it will be first.
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*/
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if ((saved_t = t)->rn_mask == 0)
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t = t->rn_dupedkey;
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for (; t; t = t->rn_dupedkey) {
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/*
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* Even if we don't match exactly as a host,
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* we may match if the leaf we wound up at is
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* a route to a net.
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*/
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if (t->rn_flags & RNF_NORMAL) {
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if (rn_b <= t->rn_b)
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return t;
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} else if (rn_satisfies_leaf(v, t, matched_off)) {
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return t;
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}
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}
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t = saved_t;
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/* start searching up the tree */
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do {
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struct radix_mask *m;
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t = t->rn_p;
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if ((m = t->rn_mklist)) {
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/*
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* If non-contiguous masks ever become important
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* we can restore the masking and open coding of
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* the search and satisfaction test and put the
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* calculation of "off" back before the "do".
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*/
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do {
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if (m->rm_flags & RNF_NORMAL) {
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if (rn_b <= m->rm_b)
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return (m->rm_leaf);
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} else {
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off = min(t->rn_off, matched_off);
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x = rn_search_m(v, t, m->rm_mask);
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while (x && x->rn_mask != m->rm_mask)
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x = x->rn_dupedkey;
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if (x && rn_satisfies_leaf(v, x, off))
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return x;
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}
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} while ((m = m->rm_mklist));
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}
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} while (t != top);
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return 0;
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}
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#ifdef RN_DEBUG
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int rn_nodenum;
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struct radix_node *rn_clist;
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int rn_saveinfo;
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int rn_debug = 1;
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#endif
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static struct radix_node *
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rn_newpair(void *v, int b, struct radix_node nodes[2])
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{
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struct radix_node *tt = nodes, *t = tt + 1;
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t->rn_b = b; t->rn_bmask = 0x80 >> (b & 7);
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t->rn_l = tt; t->rn_off = b >> 3;
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tt->rn_b = -1; tt->rn_key = (caddr_t)v; tt->rn_p = t;
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tt->rn_flags = t->rn_flags = RNF_ACTIVE;
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#ifdef RN_DEBUG
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tt->rn_info = rn_nodenum++; t->rn_info = rn_nodenum++;
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tt->rn_twin = t; tt->rn_ybro = rn_clist; rn_clist = tt;
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#endif
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return t;
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}
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static struct radix_node *
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rn_insert(void* v_arg,
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struct radix_node_head *head,
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int *dupentry,
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struct radix_node nodes[2])
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{
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caddr_t v = v_arg;
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struct radix_node *top = head->rnh_treetop;
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int head_off = top->rn_off, vlen = (int)*((u_char *)v);
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struct radix_node *t = rn_search(v_arg, top);
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caddr_t cp = v + head_off;
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int b;
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struct radix_node *tt;
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/*
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* Find first bit at which v and t->rn_key differ
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*/
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{
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caddr_t cp2 = t->rn_key + head_off;
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int cmp_res;
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caddr_t cplim = v + vlen;
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while (cp < cplim)
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if (*cp2++ != *cp++)
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goto on1;
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/* handle adding 255.255.255.255 */
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if (!(t->rn_flags & RNF_ROOT) || *(cp2-1) == 0) {
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*dupentry = 1;
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return t;
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}
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on1:
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*dupentry = 0;
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cmp_res = (cp[-1] ^ cp2[-1]) & 0xff;
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for (b = (cp - v) << 3; cmp_res; b--)
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cmp_res >>= 1;
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}
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{
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struct radix_node *p, *x = top;
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cp = v;
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do {
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p = x;
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if (cp[x->rn_off] & x->rn_bmask)
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x = x->rn_r;
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else x = x->rn_l;
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} while ((unsigned)b > (unsigned)x->rn_b);
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#ifdef RN_DEBUG
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if (rn_debug)
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log(LOG_DEBUG, "rn_insert: Going In:\n"), traverse(p);
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#endif
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t = rn_newpair(v_arg, b, nodes); tt = t->rn_l;
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if ((cp[p->rn_off] & p->rn_bmask) == 0)
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p->rn_l = t;
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else
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p->rn_r = t;
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x->rn_p = t; t->rn_p = p; /* frees x, p as temp vars below */
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if ((cp[t->rn_off] & t->rn_bmask) == 0) {
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t->rn_r = x;
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} else {
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t->rn_r = tt; t->rn_l = x;
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}
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#ifdef RN_DEBUG
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if (rn_debug)
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log(LOG_DEBUG, "rn_insert: Coming Out:\n"), traverse(p);
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#endif
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}
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return (tt);
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}
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static struct radix_node *
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rn_addmask(void *n_arg, int search, int skip)
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{
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caddr_t netmask = (caddr_t)n_arg;
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struct radix_node *x;
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caddr_t cp, cplim;
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int b = 0, mlen, j;
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int maskduplicated, m0, isnormal;
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struct radix_node *saved_x;
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static int last_zeroed = 0;
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if ((mlen = *(u_char *)netmask) > max_keylen)
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mlen = max_keylen;
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if (skip == 0)
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skip = 1;
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if (mlen <= skip)
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return (mask_rnhead->rnh_nodes);
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if (skip > 1)
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Bcopy(rn_ones + 1, addmask_key + 1, skip - 1);
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if ((m0 = mlen) > skip)
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Bcopy(netmask + skip, addmask_key + skip, mlen - skip);
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/*
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* Trim trailing zeroes.
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*/
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for (cp = addmask_key + mlen; (cp > addmask_key) && cp[-1] == 0;)
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cp--;
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mlen = cp - addmask_key;
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if (mlen <= skip) {
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if (m0 >= last_zeroed)
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last_zeroed = mlen;
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return (mask_rnhead->rnh_nodes);
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}
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if (m0 < last_zeroed)
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Bzero(addmask_key + m0, last_zeroed - m0);
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*addmask_key = last_zeroed = mlen;
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x = rn_search(addmask_key, rn_masktop);
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if (Bcmp(addmask_key, x->rn_key, mlen) != 0)
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x = NULL;
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if (x || search)
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return (x);
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x = (struct radix_node *)rtmalloc(max_keylen + 2*sizeof(*x),
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"rn_addmask");
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saved_x = x;
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Bzero(x, max_keylen + 2 * sizeof (*x));
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netmask = cp = (caddr_t)(x + 2);
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Bcopy(addmask_key, cp, mlen);
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x = rn_insert(cp, mask_rnhead, &maskduplicated, x);
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if (maskduplicated) {
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log(LOG_ERR, "rn_addmask: mask impossibly already in tree");
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Free(saved_x);
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return (x);
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}
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/*
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* Calculate index of mask, and check for normalcy.
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*/
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cplim = netmask + mlen; isnormal = 1;
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for (cp = netmask + skip; (cp < cplim) && *(u_char *)cp == 0xff;)
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cp++;
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if (cp != cplim) {
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for (j = 0x80; (j & *cp) != 0; j >>= 1)
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b++;
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if (*cp != normal_chars[b] || cp != (cplim - 1))
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isnormal = 0;
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}
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b += (cp - netmask) << 3;
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x->rn_b = -1 - b;
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if (isnormal)
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x->rn_flags |= RNF_NORMAL;
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return (x);
|
|
}
|
|
|
|
static int /* XXX: arbitrary ordering for non-contiguous masks */
|
|
rn_lexobetter(void *m_arg, void *n_arg)
|
|
{
|
|
u_char *mp = m_arg, *np = n_arg, *lim;
|
|
|
|
if (*mp > *np)
|
|
return 1; /* not really, but need to check longer one first */
|
|
if (*mp == *np)
|
|
for (lim = mp + *mp; mp < lim;)
|
|
if (*mp++ > *np++)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
static struct radix_mask *
|
|
rn_new_radix_mask(struct radix_node *tt,
|
|
struct radix_mask *next)
|
|
{
|
|
struct radix_mask *m;
|
|
|
|
MKGet(m);
|
|
if (m == NULL) {
|
|
log(LOG_ERR, "Mask for route not entered\n");
|
|
return (0);
|
|
}
|
|
Bzero(m, sizeof *m);
|
|
m->rm_b = tt->rn_b;
|
|
m->rm_flags = tt->rn_flags;
|
|
if (tt->rn_flags & RNF_NORMAL)
|
|
m->rm_leaf = tt;
|
|
else
|
|
m->rm_mask = tt->rn_mask;
|
|
m->rm_mklist = next;
|
|
tt->rn_mklist = m;
|
|
return m;
|
|
}
|
|
|
|
static struct radix_node *
|
|
rn_addroute(void *v_arg,
|
|
void *n_arg,
|
|
struct radix_node_head *head,
|
|
struct radix_node treenodes[2])
|
|
{
|
|
caddr_t v = (caddr_t)v_arg, netmask = (caddr_t)n_arg;
|
|
struct radix_node *t, *x = NULL, *tt;
|
|
struct radix_node *saved_tt, *top = head->rnh_treetop;
|
|
short b = 0, b_leaf = 0;
|
|
int keyduplicated;
|
|
caddr_t mmask;
|
|
struct radix_mask *m, **mp;
|
|
|
|
/*
|
|
* In dealing with non-contiguous masks, there may be
|
|
* many different routes which have the same mask.
|
|
* We will find it useful to have a unique pointer to
|
|
* the mask to speed avoiding duplicate references at
|
|
* nodes and possibly save time in calculating indices.
|
|
*/
|
|
if (netmask) {
|
|
if ((x = rn_addmask(netmask, 0, top->rn_off)) == NULL)
|
|
return (0);
|
|
b_leaf = x->rn_b;
|
|
b = -1 - x->rn_b;
|
|
netmask = x->rn_key;
|
|
}
|
|
/*
|
|
* Deal with duplicated keys: attach node to previous instance
|
|
*/
|
|
saved_tt = tt = rn_insert(v, head, &keyduplicated, treenodes);
|
|
if (keyduplicated) {
|
|
for (t = tt; tt; t = tt, tt = tt->rn_dupedkey) {
|
|
if (tt->rn_mask == netmask)
|
|
return (0);
|
|
if (netmask == 0 ||
|
|
(tt->rn_mask &&
|
|
((b_leaf < tt->rn_b) || /* index(netmask) > node */
|
|
rn_refines(netmask, tt->rn_mask) ||
|
|
rn_lexobetter(netmask, tt->rn_mask))))
|
|
break;
|
|
}
|
|
/*
|
|
* If the mask is not duplicated, we wouldn't
|
|
* find it among possible duplicate key entries
|
|
* anyway, so the above test doesn't hurt.
|
|
*
|
|
* We sort the masks for a duplicated key the same way as
|
|
* in a masklist -- most specific to least specific.
|
|
* This may require the unfortunate nuisance of relocating
|
|
* the head of the list.
|
|
*/
|
|
if (tt == saved_tt) {
|
|
struct radix_node *xx = x;
|
|
/* link in at head of list */
|
|
(tt = treenodes)->rn_dupedkey = t;
|
|
tt->rn_flags = t->rn_flags;
|
|
tt->rn_p = x = t->rn_p;
|
|
if (x->rn_l == t) x->rn_l = tt; else x->rn_r = tt;
|
|
saved_tt = tt; x = xx;
|
|
} else {
|
|
(tt = treenodes)->rn_dupedkey = t->rn_dupedkey;
|
|
t->rn_dupedkey = tt;
|
|
}
|
|
#ifdef RN_DEBUG
|
|
t=tt+1; tt->rn_info = rn_nodenum++; t->rn_info = rn_nodenum++;
|
|
tt->rn_twin = t; tt->rn_ybro = rn_clist; rn_clist = tt;
|
|
#endif
|
|
tt->rn_key = (caddr_t) v;
|
|
tt->rn_b = -1;
|
|
tt->rn_flags = RNF_ACTIVE;
|
|
}
|
|
/*
|
|
* Put mask in tree.
|
|
*/
|
|
if (netmask) {
|
|
tt->rn_mask = netmask;
|
|
tt->rn_b = x->rn_b;
|
|
tt->rn_flags |= x->rn_flags & RNF_NORMAL;
|
|
}
|
|
t = saved_tt->rn_p;
|
|
if (keyduplicated)
|
|
goto on2;
|
|
b_leaf = -1 - t->rn_b;
|
|
if (t->rn_r == saved_tt) x = t->rn_l; else x = t->rn_r;
|
|
/* Promote general routes from below */
|
|
if (x->rn_b < 0) {
|
|
for (mp = &t->rn_mklist; x; x = x->rn_dupedkey)
|
|
if (x->rn_mask && (x->rn_b >= b_leaf) && x->rn_mklist == 0) {
|
|
if ((*mp = m = rn_new_radix_mask(x, 0)))
|
|
mp = &m->rm_mklist;
|
|
}
|
|
} else if (x->rn_mklist) {
|
|
/*
|
|
* Skip over masks whose index is > that of new node
|
|
*/
|
|
for (mp = &x->rn_mklist; (m = *mp); mp = &m->rm_mklist)
|
|
if (m->rm_b >= b_leaf)
|
|
break;
|
|
t->rn_mklist = m; *mp = NULL;
|
|
}
|
|
on2:
|
|
/* Add new route to highest possible ancestor's list */
|
|
if ((netmask == 0) || (b > t->rn_b ))
|
|
return tt; /* can't lift at all */
|
|
b_leaf = tt->rn_b;
|
|
do {
|
|
x = t;
|
|
t = t->rn_p;
|
|
} while (b <= t->rn_b && x != top);
|
|
/*
|
|
* Search through routes associated with node to
|
|
* insert new route according to index.
|
|
* Need same criteria as when sorting dupedkeys to avoid
|
|
* double loop on deletion.
|
|
*/
|
|
for (mp = &x->rn_mklist; (m = *mp); mp = &m->rm_mklist) {
|
|
if (m->rm_b < b_leaf)
|
|
continue;
|
|
if (m->rm_b > b_leaf)
|
|
break;
|
|
if (m->rm_flags & RNF_NORMAL) {
|
|
mmask = m->rm_leaf->rn_mask;
|
|
if (tt->rn_flags & RNF_NORMAL) {
|
|
log(LOG_ERR,
|
|
"Non-unique normal route, mask not entered");
|
|
return tt;
|
|
}
|
|
} else
|
|
mmask = m->rm_mask;
|
|
if (mmask == netmask) {
|
|
m->rm_refs++;
|
|
tt->rn_mklist = m;
|
|
return tt;
|
|
}
|
|
if (rn_refines(netmask, mmask) || rn_lexobetter(netmask, mmask))
|
|
break;
|
|
}
|
|
*mp = rn_new_radix_mask(tt, *mp);
|
|
return tt;
|
|
}
|
|
|
|
static struct radix_node *
|
|
rn_delete(void *v_arg,
|
|
void *netmask_arg,
|
|
struct radix_node_head *head)
|
|
{
|
|
struct radix_node *t, *p, *x, *tt;
|
|
struct radix_mask *m, *saved_m, **mp;
|
|
struct radix_node *dupedkey, *saved_tt, *top;
|
|
caddr_t v, netmask;
|
|
int b, head_off, vlen;
|
|
|
|
v = v_arg;
|
|
netmask = netmask_arg;
|
|
x = head->rnh_treetop;
|
|
tt = rn_search(v, x);
|
|
head_off = x->rn_off;
|
|
vlen = *(u_char *)v;
|
|
saved_tt = tt;
|
|
top = x;
|
|
if (tt == NULL ||
|
|
Bcmp(v + head_off, tt->rn_key + head_off, vlen - head_off))
|
|
return (0);
|
|
/*
|
|
* Delete our route from mask lists.
|
|
*/
|
|
if (netmask) {
|
|
if ((x = rn_addmask(netmask, 1, head_off)) == NULL)
|
|
return (0);
|
|
netmask = x->rn_key;
|
|
while (tt->rn_mask != netmask)
|
|
if ((tt = tt->rn_dupedkey) == NULL)
|
|
return (0);
|
|
}
|
|
if (tt->rn_mask == 0 || (saved_m = m = tt->rn_mklist) == NULL)
|
|
goto on1;
|
|
if (tt->rn_flags & RNF_NORMAL) {
|
|
if (m->rm_leaf != tt || m->rm_refs > 0) {
|
|
log(LOG_ERR, "rn_delete: inconsistent annotation\n");
|
|
return 0; /* dangling ref could cause disaster */
|
|
}
|
|
} else {
|
|
if (m->rm_mask != tt->rn_mask) {
|
|
log(LOG_ERR, "rn_delete: inconsistent annotation\n");
|
|
goto on1;
|
|
}
|
|
if (--m->rm_refs >= 0)
|
|
goto on1;
|
|
}
|
|
b = -1 - tt->rn_b;
|
|
t = saved_tt->rn_p;
|
|
if (b > t->rn_b)
|
|
goto on1; /* Wasn't lifted at all */
|
|
do {
|
|
x = t;
|
|
t = t->rn_p;
|
|
} while (b <= t->rn_b && x != top);
|
|
for (mp = &x->rn_mklist; (m = *mp); mp = &m->rm_mklist)
|
|
if (m == saved_m) {
|
|
*mp = m->rm_mklist;
|
|
MKFree(m);
|
|
break;
|
|
}
|
|
if (m == NULL) {
|
|
log(LOG_ERR, "rn_delete: couldn't find our annotation\n");
|
|
if (tt->rn_flags & RNF_NORMAL)
|
|
return (0); /* Dangling ref to us */
|
|
}
|
|
on1:
|
|
/*
|
|
* Eliminate us from tree
|
|
*/
|
|
if (tt->rn_flags & RNF_ROOT)
|
|
return (0);
|
|
#ifdef RN_DEBUG
|
|
/* Get us out of the creation list */
|
|
for (t = rn_clist; t && t->rn_ybro != tt; t = t->rn_ybro) {}
|
|
if (t) t->rn_ybro = tt->rn_ybro;
|
|
#endif
|
|
t = tt->rn_p;
|
|
if ((dupedkey = saved_tt->rn_dupedkey)) {
|
|
if (tt == saved_tt) {
|
|
x = dupedkey; x->rn_p = t;
|
|
if (t->rn_l == tt) t->rn_l = x; else t->rn_r = x;
|
|
} else {
|
|
for (x = p = saved_tt; p && p->rn_dupedkey != tt;)
|
|
p = p->rn_dupedkey;
|
|
if (p) p->rn_dupedkey = tt->rn_dupedkey;
|
|
else log(LOG_ERR, "rn_delete: couldn't find us\n");
|
|
}
|
|
t = tt + 1;
|
|
if (t->rn_flags & RNF_ACTIVE) {
|
|
#ifndef RN_DEBUG
|
|
*++x = *t; p = t->rn_p;
|
|
#else
|
|
b = t->rn_info; *++x = *t; t->rn_info = b; p = t->rn_p;
|
|
#endif
|
|
if (p->rn_l == t) p->rn_l = x; else p->rn_r = x;
|
|
x->rn_l->rn_p = x; x->rn_r->rn_p = x;
|
|
}
|
|
goto out;
|
|
}
|
|
if (t->rn_l == tt) x = t->rn_r; else x = t->rn_l;
|
|
p = t->rn_p;
|
|
if (p->rn_r == t) p->rn_r = x; else p->rn_l = x;
|
|
x->rn_p = p;
|
|
/*
|
|
* Demote routes attached to us.
|
|
*/
|
|
if (t->rn_mklist) {
|
|
if (x->rn_b >= 0) {
|
|
for (mp = &x->rn_mklist; (m = *mp);)
|
|
mp = &m->rm_mklist;
|
|
*mp = t->rn_mklist;
|
|
} else {
|
|
/* If there are any key,mask pairs in a sibling
|
|
duped-key chain, some subset will appear sorted
|
|
in the same order attached to our mklist */
|
|
for (m = t->rn_mklist; m && x; x = x->rn_dupedkey)
|
|
if (m == x->rn_mklist) {
|
|
struct radix_mask *mm = m->rm_mklist;
|
|
x->rn_mklist = 0;
|
|
if (--(m->rm_refs) < 0)
|
|
MKFree(m);
|
|
m = mm;
|
|
}
|
|
if (m)
|
|
syslog(LOG_ERR, "%s 0x%lx at 0x%lx\n",
|
|
"rn_delete: Orphaned Mask",
|
|
(unsigned long)m,
|
|
(unsigned long)x);
|
|
}
|
|
}
|
|
/*
|
|
* We may be holding an active internal node in the tree.
|
|
*/
|
|
x = tt + 1;
|
|
if (t != x) {
|
|
#ifndef RN_DEBUG
|
|
*t = *x;
|
|
#else
|
|
b = t->rn_info; *t = *x; t->rn_info = b;
|
|
#endif
|
|
t->rn_l->rn_p = t; t->rn_r->rn_p = t;
|
|
p = x->rn_p;
|
|
if (p->rn_l == x) p->rn_l = t; else p->rn_r = t;
|
|
}
|
|
out:
|
|
tt->rn_flags &= ~RNF_ACTIVE;
|
|
tt[1].rn_flags &= ~RNF_ACTIVE;
|
|
return (tt);
|
|
}
|
|
|
|
int
|
|
rn_walktree(struct radix_node_head *h,
|
|
int (*f)(struct radix_node *, struct walkarg *),
|
|
struct walkarg *w)
|
|
{
|
|
int error;
|
|
struct radix_node *base, *next;
|
|
struct radix_node *rn = h->rnh_treetop;
|
|
/*
|
|
* This gets complicated because we may delete the node
|
|
* while applying the function f to it, so we need to calculate
|
|
* the successor node in advance.
|
|
*/
|
|
/* First time through node, go left */
|
|
while (rn->rn_b >= 0)
|
|
rn = rn->rn_l;
|
|
for (;;) {
|
|
base = rn;
|
|
/* If at right child go back up, otherwise, go right */
|
|
while (rn->rn_p->rn_r == rn && (rn->rn_flags & RNF_ROOT) == 0)
|
|
rn = rn->rn_p;
|
|
/* Find the next *leaf* since next node might vanish, too */
|
|
for (rn = rn->rn_p->rn_r; rn->rn_b >= 0;)
|
|
rn = rn->rn_l;
|
|
next = rn;
|
|
/* Process leaves */
|
|
while ((rn = base)) {
|
|
base = rn->rn_dupedkey;
|
|
if (!(rn->rn_flags & RNF_ROOT) && (error = (*f)(rn, w)))
|
|
return (error);
|
|
}
|
|
rn = next;
|
|
if (rn->rn_flags & RNF_ROOT)
|
|
return (0);
|
|
}
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
int
|
|
rn_inithead(struct radix_node_head **head, int off)
|
|
{
|
|
struct radix_node_head *rnh;
|
|
struct radix_node *t, *tt, *ttt;
|
|
if (*head)
|
|
return (1);
|
|
rnh = (struct radix_node_head *)rtmalloc(sizeof(*rnh), "rn_inithead");
|
|
Bzero(rnh, sizeof (*rnh));
|
|
*head = rnh;
|
|
t = rn_newpair(rn_zeros, off, rnh->rnh_nodes);
|
|
ttt = rnh->rnh_nodes + 2;
|
|
t->rn_r = ttt;
|
|
t->rn_p = t;
|
|
tt = t->rn_l;
|
|
tt->rn_flags = t->rn_flags = RNF_ROOT | RNF_ACTIVE;
|
|
tt->rn_b = -1 - off;
|
|
*ttt = *tt;
|
|
ttt->rn_key = rn_ones;
|
|
rnh->rnh_addaddr = rn_addroute;
|
|
rnh->rnh_deladdr = rn_delete;
|
|
rnh->rnh_matchaddr = rn_match;
|
|
rnh->rnh_lookup = rn_lookup;
|
|
rnh->rnh_walktree = rn_walktree;
|
|
rnh->rnh_treetop = t;
|
|
return (1);
|
|
}
|
|
|
|
void
|
|
rn_init(void)
|
|
{
|
|
char *cp, *cplim;
|
|
if (max_keylen == 0) {
|
|
printf("rn_init: radix functions require max_keylen be set\n");
|
|
return;
|
|
}
|
|
rn_zeros = (char *)rtmalloc(3 * max_keylen, "rn_init");
|
|
Bzero(rn_zeros, 3 * max_keylen);
|
|
rn_ones = cp = rn_zeros + max_keylen;
|
|
addmask_key = cplim = rn_ones + max_keylen;
|
|
while (cp < cplim)
|
|
*cp++ = -1;
|
|
if (rn_inithead(&mask_rnhead, 0) == 0)
|
|
panic("rn_init 2");
|
|
}
|
|
|