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32fb15e802
Require valid netmask to be passed since host route is always a leaf. PR: kern/174959 Submitted by: Keith Sklower MFC after: 2 weeks
1199 lines
31 KiB
C
1199 lines
31 KiB
C
/*-
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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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* 4. 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 8.5 (Berkeley) 5/19/95
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* $FreeBSD$
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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 <sys/param.h>
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#ifdef _KERNEL
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/rwlock.h>
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#include <sys/systm.h>
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#include <sys/malloc.h>
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#include <sys/syslog.h>
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#include <net/radix.h>
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#include "opt_mpath.h"
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#ifdef RADIX_MPATH
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#include <net/radix_mpath.h>
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#endif
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#else /* !_KERNEL */
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#include <stdio.h>
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#include <strings.h>
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#include <stdlib.h>
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#define log(x, arg...) fprintf(stderr, ## arg)
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#define panic(x) fprintf(stderr, "PANIC: %s", x), exit(1)
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#define min(a, b) ((a) < (b) ? (a) : (b) )
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#include <net/radix.h>
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#endif /* !_KERNEL */
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static int rn_walktree_from(struct radix_node_head *h, void *a, void *m,
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walktree_f_t *f, void *w);
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static int rn_walktree(struct radix_node_head *, walktree_f_t *, void *);
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static struct radix_node
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*rn_insert(void *, struct radix_node_head *, int *,
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struct radix_node [2]),
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*rn_newpair(void *, int, struct radix_node[2]),
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*rn_search(void *, struct radix_node *),
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*rn_search_m(void *, struct radix_node *, void *);
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static void rn_detachhead_internal(void **head);
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static int rn_inithead_internal(void **head, int off);
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#define RADIX_MAX_KEY_LEN 32
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static char rn_zeros[RADIX_MAX_KEY_LEN];
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static char rn_ones[RADIX_MAX_KEY_LEN] = {
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-1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1,
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};
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static int rn_lexobetter(void *m_arg, void *n_arg);
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static struct radix_mask *
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rn_new_radix_mask(struct radix_node *tt,
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struct radix_mask *next);
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static int rn_satisfies_leaf(char *trial, struct radix_node *leaf,
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int skip);
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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_bit 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_bit - 1.
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* (We say the index of n is rn_bit.)
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*
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* There is at least one descendant which has a one bit at position rn_bit,
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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_bit,
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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_bit, 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 explict 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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/*
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* Most of the functions in this code assume that the key/mask arguments
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* are sockaddr-like structures, where the first byte is an u_char
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* indicating the size of the entire structure.
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*
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* To make the assumption more explicit, we use the LEN() macro to access
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* this field. It is safe to pass an expression with side effects
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* to LEN() as the argument is evaluated only once.
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* We cast the result to int as this is the dominant usage.
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*/
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#define LEN(x) ( (int) (*(const u_char *)(x)) )
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/*
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* XXX THIS NEEDS TO BE FIXED
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* In the code, pointers to keys and masks are passed as either
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* 'void *' (because callers use to pass pointers of various kinds), or
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* 'caddr_t' (which is fine for pointer arithmetics, but not very
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* clean when you dereference it to access data). Furthermore, caddr_t
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* is really 'char *', while the natural type to operate on keys and
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* masks would be 'u_char'. This mismatch require a lot of casts and
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* intermediate variables to adapt types that clutter the code.
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*/
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/*
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* Search a node in the tree matching the key.
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*/
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static struct radix_node *
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rn_search(void *v_arg, 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_bit >= 0;) {
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if (x->rn_bmask & v[x->rn_offset])
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x = x->rn_right;
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else
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x = x->rn_left;
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}
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return (x);
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}
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/*
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* Same as above, but with an additional mask.
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* XXX note this function is used only once.
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*/
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static struct radix_node *
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rn_search_m(void *v_arg, struct radix_node *head, 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_bit >= 0;) {
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if ((x->rn_bmask & m[x->rn_offset]) &&
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(x->rn_bmask & v[x->rn_offset]))
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x = x->rn_right;
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else
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x = x->rn_left;
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}
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return (x);
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}
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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 + LEN(n);
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int longer = LEN(n++) - LEN(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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/*
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* Search for exact match in given @head.
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* Assume host bits are cleared in @v_arg if @m_arg is not NULL
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* Note that prefixes with /32 or /128 masks are treated differently
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* from host routes.
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*/
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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;
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if (m_arg != NULL) {
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/*
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* Most common case: search exact prefix/mask
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*/
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x = rn_addmask(m_arg, head->rnh_masks, 1,
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head->rnh_treetop->rn_offset);
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if (x == NULL)
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return (NULL);
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netmask = x->rn_key;
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x = rn_match(v_arg, head);
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while (x != NULL && x->rn_mask != netmask)
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x = x->rn_dupedkey;
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return (x);
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}
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/*
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* Search for host address.
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*/
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if ((x = rn_match(v_arg, head)) == NULL)
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return (NULL);
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/* Check if found key is the same */
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if (LEN(x->rn_key) != LEN(v_arg) || bcmp(x->rn_key, v_arg, LEN(v_arg)))
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return (NULL);
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/* Check if this is not host route */
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if (x->rn_mask != NULL)
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return (NULL);
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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, struct radix_node *leaf, 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(LEN(cp), LEN(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, LEN(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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/*
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* Search for longest-prefix match in given @head
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*/
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struct radix_node *
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rn_match(void *v_arg, 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_offset, vlen = LEN(cp), matched_off;
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int test, b, rn_bit;
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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_bit >= 0; ) {
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if (t->rn_bmask & cp[t->rn_offset])
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t = t->rn_right;
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else
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t = t->rn_left;
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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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*
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* Never return the root node itself, it seems to cause a
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* lot of confusion.
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*/
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if (t->rn_flags & RNF_ROOT)
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t = t->rn_dupedkey;
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return (t);
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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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matched_off = cp - v;
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b += matched_off << 3;
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rn_bit = -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_bit <= t->rn_bit)
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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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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_parent;
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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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while (m) {
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if (m->rm_flags & RNF_NORMAL) {
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if (rn_bit <= m->rm_bit)
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return (m->rm_leaf);
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} else {
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off = min(t->rn_offset, 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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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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/*
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* Whenever we add a new leaf to the tree, we also add a parent node,
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* so we allocate them as an array of two elements: the first one must be
|
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* the leaf (see RNTORT() in route.c), the second one is the parent.
|
|
* This routine initializes the relevant fields of the nodes, so that
|
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* the leaf is the left child of the parent node, and both nodes have
|
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* (almost) all all fields filled as appropriate.
|
|
* (XXX some fields are left unset, see the '#if 0' section).
|
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* The function returns a pointer to the parent node.
|
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*/
|
|
|
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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_bit = b;
|
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t->rn_bmask = 0x80 >> (b & 7);
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t->rn_left = tt;
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t->rn_offset = b >> 3;
|
|
|
|
#if 0 /* XXX perhaps we should fill these fields as well. */
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t->rn_parent = t->rn_right = NULL;
|
|
|
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tt->rn_mask = NULL;
|
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tt->rn_dupedkey = NULL;
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tt->rn_bmask = 0;
|
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#endif
|
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tt->rn_bit = -1;
|
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tt->rn_key = (caddr_t)v;
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tt->rn_parent = t;
|
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tt->rn_flags = t->rn_flags = RNF_ACTIVE;
|
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tt->rn_mklist = t->rn_mklist = 0;
|
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#ifdef RN_DEBUG
|
|
tt->rn_info = rn_nodenum++; t->rn_info = rn_nodenum++;
|
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tt->rn_twin = t;
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tt->rn_ybro = rn_clist;
|
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rn_clist = tt;
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#endif
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return (t);
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}
|
|
|
|
static struct radix_node *
|
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rn_insert(void *v_arg, struct radix_node_head *head, int *dupentry,
|
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struct radix_node nodes[2])
|
|
{
|
|
caddr_t v = v_arg;
|
|
struct radix_node *top = head->rnh_treetop;
|
|
int head_off = top->rn_offset, vlen = LEN(v);
|
|
struct radix_node *t = rn_search(v_arg, top);
|
|
caddr_t cp = v + head_off;
|
|
int b;
|
|
struct radix_node *p, *tt, *x;
|
|
/*
|
|
* Find first bit at which v and t->rn_key differ
|
|
*/
|
|
caddr_t cp2 = t->rn_key + head_off;
|
|
int cmp_res;
|
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caddr_t cplim = v + vlen;
|
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|
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while (cp < cplim)
|
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if (*cp2++ != *cp++)
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goto on1;
|
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*dupentry = 1;
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return (t);
|
|
on1:
|
|
*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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x = top;
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cp = v;
|
|
do {
|
|
p = x;
|
|
if (cp[x->rn_offset] & x->rn_bmask)
|
|
x = x->rn_right;
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|
else
|
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x = x->rn_left;
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|
} while (b > (unsigned) x->rn_bit);
|
|
/* x->rn_bit < b && x->rn_bit >= 0 */
|
|
#ifdef RN_DEBUG
|
|
if (rn_debug)
|
|
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);
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tt = t->rn_left;
|
|
if ((cp[p->rn_offset] & p->rn_bmask) == 0)
|
|
p->rn_left = t;
|
|
else
|
|
p->rn_right = t;
|
|
x->rn_parent = t;
|
|
t->rn_parent = p; /* frees x, p as temp vars below */
|
|
if ((cp[t->rn_offset] & t->rn_bmask) == 0) {
|
|
t->rn_right = x;
|
|
} else {
|
|
t->rn_right = tt;
|
|
t->rn_left = x;
|
|
}
|
|
#ifdef RN_DEBUG
|
|
if (rn_debug)
|
|
log(LOG_DEBUG, "rn_insert: Coming Out:\n"), traverse(p);
|
|
#endif
|
|
return (tt);
|
|
}
|
|
|
|
struct radix_node *
|
|
rn_addmask(void *n_arg, struct radix_node_head *maskhead, int search, int skip)
|
|
{
|
|
unsigned char *netmask = n_arg;
|
|
unsigned char *cp, *cplim;
|
|
struct radix_node *x;
|
|
int b = 0, mlen, j;
|
|
int maskduplicated, isnormal;
|
|
struct radix_node *saved_x;
|
|
unsigned char addmask_key[RADIX_MAX_KEY_LEN];
|
|
|
|
if ((mlen = LEN(netmask)) > RADIX_MAX_KEY_LEN)
|
|
mlen = RADIX_MAX_KEY_LEN;
|
|
if (skip == 0)
|
|
skip = 1;
|
|
if (mlen <= skip)
|
|
return (maskhead->rnh_nodes);
|
|
|
|
bzero(addmask_key, RADIX_MAX_KEY_LEN);
|
|
if (skip > 1)
|
|
bcopy(rn_ones + 1, addmask_key + 1, skip - 1);
|
|
bcopy(netmask + skip, addmask_key + skip, mlen - skip);
|
|
/*
|
|
* Trim trailing zeroes.
|
|
*/
|
|
for (cp = addmask_key + mlen; (cp > addmask_key) && cp[-1] == 0;)
|
|
cp--;
|
|
mlen = cp - addmask_key;
|
|
if (mlen <= skip)
|
|
return (maskhead->rnh_nodes);
|
|
*addmask_key = mlen;
|
|
x = rn_search(addmask_key, maskhead->rnh_treetop);
|
|
if (bcmp(addmask_key, x->rn_key, mlen) != 0)
|
|
x = 0;
|
|
if (x || search)
|
|
return (x);
|
|
R_Zalloc(x, struct radix_node *, RADIX_MAX_KEY_LEN + 2 * sizeof (*x));
|
|
if ((saved_x = x) == 0)
|
|
return (0);
|
|
netmask = cp = (caddr_t)(x + 2);
|
|
bcopy(addmask_key, cp, mlen);
|
|
x = rn_insert(cp, maskhead, &maskduplicated, x);
|
|
if (maskduplicated) {
|
|
log(LOG_ERR, "rn_addmask: mask impossibly already in tree");
|
|
Free(saved_x);
|
|
return (x);
|
|
}
|
|
/*
|
|
* Calculate index of mask, and check for normalcy.
|
|
* First find the first byte with a 0 bit, then if there are
|
|
* more bits left (remember we already trimmed the trailing 0's),
|
|
* the bits should be contiguous, otherwise we have got
|
|
* a non-contiguous mask.
|
|
*/
|
|
#define CONTIG(_c) (((~(_c) + 1) & (_c)) == (unsigned char)(~(_c) + 1))
|
|
cplim = netmask + mlen;
|
|
isnormal = 1;
|
|
for (cp = netmask + skip; (cp < cplim) && *(u_char *)cp == 0xff;)
|
|
cp++;
|
|
if (cp != cplim) {
|
|
for (j = 0x80; (j & *cp) != 0; j >>= 1)
|
|
b++;
|
|
if (!CONTIG(*cp) || cp != (cplim - 1))
|
|
isnormal = 0;
|
|
}
|
|
b += (cp - netmask) << 3;
|
|
x->rn_bit = -1 - b;
|
|
if (isnormal)
|
|
x->rn_flags |= RNF_NORMAL;
|
|
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 (LEN(mp) > LEN(np))
|
|
return (1); /* not really, but need to check longer one first */
|
|
if (LEN(mp) == LEN(np))
|
|
for (lim = mp + LEN(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;
|
|
|
|
R_Malloc(m, struct radix_mask *, sizeof (struct radix_mask));
|
|
if (m == NULL) {
|
|
log(LOG_ERR, "Failed to allocate route mask\n");
|
|
return (0);
|
|
}
|
|
bzero(m, sizeof(*m));
|
|
m->rm_bit = tt->rn_bit;
|
|
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);
|
|
}
|
|
|
|
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 = 0, *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) {
|
|
x = rn_addmask(netmask, head->rnh_masks, 0, top->rn_offset);
|
|
if (x == NULL)
|
|
return (0);
|
|
b_leaf = x->rn_bit;
|
|
b = -1 - x->rn_bit;
|
|
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) {
|
|
#ifdef RADIX_MPATH
|
|
/* permit multipath, if enabled for the family */
|
|
if (rn_mpath_capable(head) && netmask == tt->rn_mask) {
|
|
/*
|
|
* go down to the end of multipaths, so that
|
|
* new entry goes into the end of rn_dupedkey
|
|
* chain.
|
|
*/
|
|
do {
|
|
t = tt;
|
|
tt = tt->rn_dupedkey;
|
|
} while (tt && t->rn_mask == tt->rn_mask);
|
|
break;
|
|
}
|
|
#endif
|
|
if (tt->rn_mask == netmask)
|
|
return (0);
|
|
if (netmask == 0 ||
|
|
(tt->rn_mask &&
|
|
((b_leaf < tt->rn_bit) /* 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.
|
|
*
|
|
* We also reverse, or doubly link the list through the
|
|
* parent pointer.
|
|
*/
|
|
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_parent = x = t->rn_parent;
|
|
t->rn_parent = tt; /* parent */
|
|
if (x->rn_left == t)
|
|
x->rn_left = tt;
|
|
else
|
|
x->rn_right = tt;
|
|
saved_tt = tt; x = xx;
|
|
} else {
|
|
(tt = treenodes)->rn_dupedkey = t->rn_dupedkey;
|
|
t->rn_dupedkey = tt;
|
|
tt->rn_parent = t; /* parent */
|
|
if (tt->rn_dupedkey) /* parent */
|
|
tt->rn_dupedkey->rn_parent = tt; /* parent */
|
|
}
|
|
#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_bit = -1;
|
|
tt->rn_flags = RNF_ACTIVE;
|
|
}
|
|
/*
|
|
* Put mask in tree.
|
|
*/
|
|
if (netmask) {
|
|
tt->rn_mask = netmask;
|
|
tt->rn_bit = x->rn_bit;
|
|
tt->rn_flags |= x->rn_flags & RNF_NORMAL;
|
|
}
|
|
t = saved_tt->rn_parent;
|
|
if (keyduplicated)
|
|
goto on2;
|
|
b_leaf = -1 - t->rn_bit;
|
|
if (t->rn_right == saved_tt)
|
|
x = t->rn_left;
|
|
else
|
|
x = t->rn_right;
|
|
/* Promote general routes from below */
|
|
if (x->rn_bit < 0) {
|
|
for (mp = &t->rn_mklist; x; x = x->rn_dupedkey)
|
|
if (x->rn_mask && (x->rn_bit >= b_leaf) && x->rn_mklist == 0) {
|
|
*mp = m = rn_new_radix_mask(x, 0);
|
|
if (m)
|
|
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_bit >= b_leaf)
|
|
break;
|
|
t->rn_mklist = m; *mp = 0;
|
|
}
|
|
on2:
|
|
/* Add new route to highest possible ancestor's list */
|
|
if ((netmask == 0) || (b > t->rn_bit ))
|
|
return (tt); /* can't lift at all */
|
|
b_leaf = tt->rn_bit;
|
|
do {
|
|
x = t;
|
|
t = t->rn_parent;
|
|
} while (b <= t->rn_bit && 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_bit < b_leaf)
|
|
continue;
|
|
if (m->rm_bit > b_leaf)
|
|
break;
|
|
if (m->rm_flags & RNF_NORMAL) {
|
|
mmask = m->rm_leaf->rn_mask;
|
|
if (tt->rn_flags & RNF_NORMAL) {
|
|
#if !defined(RADIX_MPATH)
|
|
log(LOG_ERR,
|
|
"Non-unique normal route, mask not entered\n");
|
|
#endif
|
|
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);
|
|
}
|
|
|
|
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_offset;
|
|
vlen = LEN(v);
|
|
saved_tt = tt;
|
|
top = x;
|
|
if (tt == 0 ||
|
|
bcmp(v + head_off, tt->rn_key + head_off, vlen - head_off))
|
|
return (0);
|
|
/*
|
|
* Delete our route from mask lists.
|
|
*/
|
|
if (netmask) {
|
|
x = rn_addmask(netmask, head->rnh_masks, 1, head_off);
|
|
if (x == NULL)
|
|
return (0);
|
|
netmask = x->rn_key;
|
|
while (tt->rn_mask != netmask)
|
|
if ((tt = tt->rn_dupedkey) == 0)
|
|
return (0);
|
|
}
|
|
if (tt->rn_mask == 0 || (saved_m = m = tt->rn_mklist) == 0)
|
|
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_bit;
|
|
t = saved_tt->rn_parent;
|
|
if (b > t->rn_bit)
|
|
goto on1; /* Wasn't lifted at all */
|
|
do {
|
|
x = t;
|
|
t = t->rn_parent;
|
|
} while (b <= t->rn_bit && x != top);
|
|
for (mp = &x->rn_mklist; (m = *mp); mp = &m->rm_mklist)
|
|
if (m == saved_m) {
|
|
*mp = m->rm_mklist;
|
|
Free(m);
|
|
break;
|
|
}
|
|
if (m == 0) {
|
|
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_parent;
|
|
dupedkey = saved_tt->rn_dupedkey;
|
|
if (dupedkey) {
|
|
/*
|
|
* Here, tt is the deletion target and
|
|
* saved_tt is the head of the dupekey chain.
|
|
*/
|
|
if (tt == saved_tt) {
|
|
/* remove from head of chain */
|
|
x = dupedkey; x->rn_parent = t;
|
|
if (t->rn_left == tt)
|
|
t->rn_left = x;
|
|
else
|
|
t->rn_right = x;
|
|
} else {
|
|
/* find node in front of tt on the chain */
|
|
for (x = p = saved_tt; p && p->rn_dupedkey != tt;)
|
|
p = p->rn_dupedkey;
|
|
if (p) {
|
|
p->rn_dupedkey = tt->rn_dupedkey;
|
|
if (tt->rn_dupedkey) /* parent */
|
|
tt->rn_dupedkey->rn_parent = p;
|
|
/* parent */
|
|
} 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_parent;
|
|
#else
|
|
b = t->rn_info;
|
|
*++x = *t;
|
|
t->rn_info = b;
|
|
p = t->rn_parent;
|
|
#endif
|
|
if (p->rn_left == t)
|
|
p->rn_left = x;
|
|
else
|
|
p->rn_right = x;
|
|
x->rn_left->rn_parent = x;
|
|
x->rn_right->rn_parent = x;
|
|
}
|
|
goto out;
|
|
}
|
|
if (t->rn_left == tt)
|
|
x = t->rn_right;
|
|
else
|
|
x = t->rn_left;
|
|
p = t->rn_parent;
|
|
if (p->rn_right == t)
|
|
p->rn_right = x;
|
|
else
|
|
p->rn_left = x;
|
|
x->rn_parent = p;
|
|
/*
|
|
* Demote routes attached to us.
|
|
*/
|
|
if (t->rn_mklist) {
|
|
if (x->rn_bit >= 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)
|
|
Free(m);
|
|
m = mm;
|
|
}
|
|
if (m)
|
|
log(LOG_ERR,
|
|
"rn_delete: Orphaned Mask %p at %p\n",
|
|
m, 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_left->rn_parent = t;
|
|
t->rn_right->rn_parent = t;
|
|
p = x->rn_parent;
|
|
if (p->rn_left == x)
|
|
p->rn_left = t;
|
|
else
|
|
p->rn_right = t;
|
|
}
|
|
out:
|
|
tt->rn_flags &= ~RNF_ACTIVE;
|
|
tt[1].rn_flags &= ~RNF_ACTIVE;
|
|
return (tt);
|
|
}
|
|
|
|
/*
|
|
* This is the same as rn_walktree() except for the parameters and the
|
|
* exit.
|
|
*/
|
|
static int
|
|
rn_walktree_from(struct radix_node_head *h, void *a, void *m,
|
|
walktree_f_t *f, void *w)
|
|
{
|
|
int error;
|
|
struct radix_node *base, *next;
|
|
u_char *xa = (u_char *)a;
|
|
u_char *xm = (u_char *)m;
|
|
struct radix_node *rn, *last = NULL; /* shut up gcc */
|
|
int stopping = 0;
|
|
int lastb;
|
|
|
|
KASSERT(m != NULL, ("%s: mask needs to be specified", __func__));
|
|
|
|
/*
|
|
* rn_search_m is sort-of-open-coded here. We cannot use the
|
|
* function because we need to keep track of the last node seen.
|
|
*/
|
|
/* printf("about to search\n"); */
|
|
for (rn = h->rnh_treetop; rn->rn_bit >= 0; ) {
|
|
last = rn;
|
|
/* printf("rn_bit %d, rn_bmask %x, xm[rn_offset] %x\n",
|
|
rn->rn_bit, rn->rn_bmask, xm[rn->rn_offset]); */
|
|
if (!(rn->rn_bmask & xm[rn->rn_offset])) {
|
|
break;
|
|
}
|
|
if (rn->rn_bmask & xa[rn->rn_offset]) {
|
|
rn = rn->rn_right;
|
|
} else {
|
|
rn = rn->rn_left;
|
|
}
|
|
}
|
|
/* printf("done searching\n"); */
|
|
|
|
/*
|
|
* Two cases: either we stepped off the end of our mask,
|
|
* in which case last == rn, or we reached a leaf, in which
|
|
* case we want to start from the leaf.
|
|
*/
|
|
if (rn->rn_bit >= 0)
|
|
rn = last;
|
|
lastb = last->rn_bit;
|
|
|
|
/* printf("rn %p, lastb %d\n", rn, lastb);*/
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
while (rn->rn_bit >= 0)
|
|
rn = rn->rn_left;
|
|
|
|
while (!stopping) {
|
|
/* printf("node %p (%d)\n", rn, rn->rn_bit); */
|
|
base = rn;
|
|
/* If at right child go back up, otherwise, go right */
|
|
while (rn->rn_parent->rn_right == rn
|
|
&& !(rn->rn_flags & RNF_ROOT)) {
|
|
rn = rn->rn_parent;
|
|
|
|
/* if went up beyond last, stop */
|
|
if (rn->rn_bit <= lastb) {
|
|
stopping = 1;
|
|
/* printf("up too far\n"); */
|
|
/*
|
|
* XXX we should jump to the 'Process leaves'
|
|
* part, because the values of 'rn' and 'next'
|
|
* we compute will not be used. Not a big deal
|
|
* because this loop will terminate, but it is
|
|
* inefficient and hard to understand!
|
|
*/
|
|
}
|
|
}
|
|
|
|
/*
|
|
* At the top of the tree, no need to traverse the right
|
|
* half, prevent the traversal of the entire tree in the
|
|
* case of default route.
|
|
*/
|
|
if (rn->rn_parent->rn_flags & RNF_ROOT)
|
|
stopping = 1;
|
|
|
|
/* Find the next *leaf* since next node might vanish, too */
|
|
for (rn = rn->rn_parent->rn_right; rn->rn_bit >= 0;)
|
|
rn = rn->rn_left;
|
|
next = rn;
|
|
/* Process leaves */
|
|
while ((rn = base) != 0) {
|
|
base = rn->rn_dupedkey;
|
|
/* printf("leaf %p\n", rn); */
|
|
if (!(rn->rn_flags & RNF_ROOT)
|
|
&& (error = (*f)(rn, w)))
|
|
return (error);
|
|
}
|
|
rn = next;
|
|
|
|
if (rn->rn_flags & RNF_ROOT) {
|
|
/* printf("root, stopping"); */
|
|
stopping = 1;
|
|
}
|
|
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
rn_walktree(struct radix_node_head *h, walktree_f_t *f, void *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_bit >= 0)
|
|
rn = rn->rn_left;
|
|
for (;;) {
|
|
base = rn;
|
|
/* If at right child go back up, otherwise, go right */
|
|
while (rn->rn_parent->rn_right == rn
|
|
&& (rn->rn_flags & RNF_ROOT) == 0)
|
|
rn = rn->rn_parent;
|
|
/* Find the next *leaf* since next node might vanish, too */
|
|
for (rn = rn->rn_parent->rn_right; rn->rn_bit >= 0;)
|
|
rn = rn->rn_left;
|
|
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 */
|
|
}
|
|
|
|
/*
|
|
* Allocate and initialize an empty tree. This has 3 nodes, which are
|
|
* part of the radix_node_head (in the order <left,root,right>) and are
|
|
* marked RNF_ROOT so they cannot be freed.
|
|
* The leaves have all-zero and all-one keys, with significant
|
|
* bits starting at 'off'.
|
|
* Return 1 on success, 0 on error.
|
|
*/
|
|
static int
|
|
rn_inithead_internal(void **head, int off)
|
|
{
|
|
struct radix_node_head *rnh;
|
|
struct radix_node *t, *tt, *ttt;
|
|
if (*head)
|
|
return (1);
|
|
R_Zalloc(rnh, struct radix_node_head *, sizeof (*rnh));
|
|
if (rnh == 0)
|
|
return (0);
|
|
#ifdef _KERNEL
|
|
RADIX_NODE_HEAD_LOCK_INIT(rnh);
|
|
#endif
|
|
*head = rnh;
|
|
t = rn_newpair(rn_zeros, off, rnh->rnh_nodes);
|
|
ttt = rnh->rnh_nodes + 2;
|
|
t->rn_right = ttt;
|
|
t->rn_parent = t;
|
|
tt = t->rn_left; /* ... which in turn is rnh->rnh_nodes */
|
|
tt->rn_flags = t->rn_flags = RNF_ROOT | RNF_ACTIVE;
|
|
tt->rn_bit = -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_walktree_from = rn_walktree_from;
|
|
rnh->rnh_treetop = t;
|
|
return (1);
|
|
}
|
|
|
|
static void
|
|
rn_detachhead_internal(void **head)
|
|
{
|
|
struct radix_node_head *rnh;
|
|
|
|
KASSERT((head != NULL && *head != NULL),
|
|
("%s: head already freed", __func__));
|
|
rnh = *head;
|
|
|
|
/* Free <left,root,right> nodes. */
|
|
Free(rnh);
|
|
|
|
*head = NULL;
|
|
}
|
|
|
|
int
|
|
rn_inithead(void **head, int off)
|
|
{
|
|
struct radix_node_head *rnh;
|
|
|
|
if (*head != NULL)
|
|
return (1);
|
|
|
|
if (rn_inithead_internal(head, off) == 0)
|
|
return (0);
|
|
|
|
rnh = (struct radix_node_head *)(*head);
|
|
|
|
if (rn_inithead_internal((void **)&rnh->rnh_masks, 0) == 0) {
|
|
rn_detachhead_internal(head);
|
|
return (0);
|
|
}
|
|
|
|
return (1);
|
|
}
|
|
|
|
int
|
|
rn_detachhead(void **head)
|
|
{
|
|
struct radix_node_head *rnh;
|
|
|
|
KASSERT((head != NULL && *head != NULL),
|
|
("%s: head already freed", __func__));
|
|
|
|
rnh = *head;
|
|
|
|
rn_detachhead_internal((void **)&rnh->rnh_masks);
|
|
rn_detachhead_internal(head);
|
|
return (1);
|
|
}
|
|
|