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Diffstat (limited to 'contrib/ipfilter/radix.c')
-rw-r--r-- | contrib/ipfilter/radix.c | 1202 |
1 files changed, 1202 insertions, 0 deletions
diff --git a/contrib/ipfilter/radix.c b/contrib/ipfilter/radix.c new file mode 100644 index 0000000..964c1095 --- /dev/null +++ b/contrib/ipfilter/radix.c @@ -0,0 +1,1202 @@ +/* $NetBSD$ */ + +/* + * Copyright (c) 1988, 1989, 1993 + * The Regents of the University of California. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * @(#)radix.c 8.6 (Berkeley) 10/17/95 + */ + +/* + * Routines to build and maintain radix trees for routing lookups. + */ +#if defined(KERNEL) || defined(_KERNEL) +# undef KERNEL +# undef _KERNEL +# define KERNEL 1 +# define _KERNEL 1 +#endif +#define __SYS_ATOMIC_OPS_H__ +#if !defined(__svr4__) && !defined(__SVR4) && !defined(__osf__) && \ + !defined(__hpux) && !defined(__sgi) +#include <sys/cdefs.h> +#endif +#ifndef __P +# ifdef __STDC__ +# define __P(x) x +# else +# define __P(x) () +# endif +#endif +#ifdef __osf__ +# define CONST +# define _IPV6_SWTAB_H +# define _PROTO_NET_H_ +# define _PROTO_IPV6_H +# include <sys/malloc.h> +#endif + +#include <sys/param.h> +#ifdef _KERNEL +#include <sys/systm.h> +#else +void panic __P((char *str)); +#include <stdlib.h> +#include <stdio.h> +#include <stdarg.h> +#include <string.h> +#endif +#ifdef __hpux +#include <syslog.h> +#else +#include <sys/syslog.h> +#endif +#include <sys/time.h> +#include <netinet/in.h> +#include <sys/socket.h> +#include <net/if.h> +#include "netinet/ip_compat.h" +#include "netinet/ip_fil.h" +/* END OF INCLUDES */ +#include "radix_ipf.h" +#ifndef min +# define min MIN +#endif +#ifndef max +# define max MAX +#endif + +int max_keylen = 16; +static struct radix_mask *rn_mkfreelist; +static struct radix_node_head *mask_rnhead; +static char *addmask_key; +static u_char normal_chars[] = {0, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff}; +static char *rn_zeros = NULL, *rn_ones = NULL; + +#define rn_masktop (mask_rnhead->rnh_treetop) +#undef Bcmp +#define Bcmp(a, b, l) (l == 0 ? 0 : bcmp((caddr_t)(a), (caddr_t)(b), (u_long)l)) + +static int rn_satisfies_leaf __P((char *, struct radix_node *, int)); +static int rn_lexobetter __P((void *, void *)); +static struct radix_mask *rn_new_radix_mask __P((struct radix_node *, + struct radix_mask *)); +static int rn_freenode __P((struct radix_node *, void *)); + +/* + * The data structure for the keys is a radix tree with one way + * branching removed. The index rn_b at an internal node n represents a bit + * position to be tested. The tree is arranged so that all descendants + * of a node n have keys whose bits all agree up to position rn_b - 1. + * (We say the index of n is rn_b.) + * + * There is at least one descendant which has a one bit at position rn_b, + * and at least one with a zero there. + * + * A route is determined by a pair of key and mask. We require that the + * bit-wise logical and of the key and mask to be the key. + * We define the index of a route to associated with the mask to be + * the first bit number in the mask where 0 occurs (with bit number 0 + * representing the highest order bit). + * + * We say a mask is normal if every bit is 0, past the index of the mask. + * If a node n has a descendant (k, m) with index(m) == index(n) == rn_b, + * and m is a normal mask, then the route applies to every descendant of n. + * If the index(m) < rn_b, this implies the trailing last few bits of k + * before bit b are all 0, (and hence consequently true of every descendant + * of n), so the route applies to all descendants of the node as well. + * + * Similar logic shows that a non-normal mask m such that + * index(m) <= index(n) could potentially apply to many children of n. + * Thus, for each non-host route, we attach its mask to a list at an internal + * node as high in the tree as we can go. + * + * The present version of the code makes use of normal routes in short- + * circuiting an explict mask and compare operation when testing whether + * a key satisfies a normal route, and also in remembering the unique leaf + * that governs a subtree. + */ + +struct radix_node * +rn_search(v_arg, head) + void *v_arg; + struct radix_node *head; +{ + struct radix_node *x; + caddr_t v; + + for (x = head, v = v_arg; x->rn_b >= 0;) { + if (x->rn_bmask & v[x->rn_off]) + x = x->rn_r; + else + x = x->rn_l; + } + return (x); +} + +struct radix_node * +rn_search_m(v_arg, head, m_arg) + struct radix_node *head; + void *v_arg, *m_arg; +{ + struct radix_node *x; + caddr_t v = v_arg, m = m_arg; + + for (x = head; x->rn_b >= 0;) { + if ((x->rn_bmask & m[x->rn_off]) && + (x->rn_bmask & v[x->rn_off])) + x = x->rn_r; + else + x = x->rn_l; + } + return x; +} + +int +rn_refines(m_arg, n_arg) + void *m_arg, *n_arg; +{ + caddr_t m = m_arg, n = n_arg; + caddr_t lim, lim2 = lim = n + *(u_char *)n; + int longer = (*(u_char *)n++) - (int)(*(u_char *)m++); + int masks_are_equal = 1; + + if (longer > 0) + lim -= longer; + while (n < lim) { + if (*n & ~(*m)) + return 0; + if (*n++ != *m++) + masks_are_equal = 0; + } + while (n < lim2) + if (*n++) + return 0; + if (masks_are_equal && (longer < 0)) + for (lim2 = m - longer; m < lim2; ) + if (*m++) + return 1; + return (!masks_are_equal); +} + +struct radix_node * +rn_lookup(v_arg, m_arg, head) + void *v_arg, *m_arg; + struct radix_node_head *head; +{ + struct radix_node *x; + caddr_t netmask = 0; + + if (m_arg) { + if ((x = rn_addmask(m_arg, 1, head->rnh_treetop->rn_off)) == 0) + return (0); + netmask = x->rn_key; + } + x = rn_match(v_arg, head); + if (x && netmask) { + while (x && x->rn_mask != netmask) + x = x->rn_dupedkey; + } + return x; +} + +static int +rn_satisfies_leaf(trial, leaf, skip) + char *trial; + struct radix_node *leaf; + int skip; +{ + char *cp = trial, *cp2 = leaf->rn_key, *cp3 = leaf->rn_mask; + char *cplim; + int length = min(*(u_char *)cp, *(u_char *)cp2); + + if (cp3 == 0) + cp3 = rn_ones; + else + length = min(length, *(u_char *)cp3); + cplim = cp + length; + cp3 += skip; + cp2 += skip; + for (cp += skip; cp < cplim; cp++, cp2++, cp3++) + if ((*cp ^ *cp2) & *cp3) + return 0; + return 1; +} + +struct radix_node * +rn_match(v_arg, head) + void *v_arg; + struct radix_node_head *head; +{ + caddr_t v = v_arg; + struct radix_node *t = head->rnh_treetop, *x; + caddr_t cp = v, cp2; + caddr_t cplim; + struct radix_node *saved_t, *top = t; + int off = t->rn_off, vlen = *(u_char *)cp, matched_off; + int test, b, rn_b; + + /* + * Open code rn_search(v, top) to avoid overhead of extra + * subroutine call. + */ + for (; t->rn_b >= 0; ) { + if (t->rn_bmask & cp[t->rn_off]) + t = t->rn_r; + else + t = t->rn_l; + } + /* + * See if we match exactly as a host destination + * or at least learn how many bits match, for normal mask finesse. + * + * It doesn't hurt us to limit how many bytes to check + * to the length of the mask, since if it matches we had a genuine + * match and the leaf we have is the most specific one anyway; + * if it didn't match with a shorter length it would fail + * with a long one. This wins big for class B&C netmasks which + * are probably the most common case... + */ + if (t->rn_mask) + vlen = *(u_char *)t->rn_mask; + cp += off; + cp2 = t->rn_key + off; + cplim = v + vlen; + for (; cp < cplim; cp++, cp2++) + if (*cp != *cp2) + goto on1; + /* + * This extra grot is in case we are explicitly asked + * to look up the default. Ugh! + */ + if ((t->rn_flags & RNF_ROOT) && t->rn_dupedkey) + t = t->rn_dupedkey; + return t; +on1: + test = (*cp ^ *cp2) & 0xff; /* find first bit that differs */ + for (b = 7; (test >>= 1) > 0;) + b--; + matched_off = cp - v; + b += matched_off << 3; + rn_b = -1 - b; + /* + * If there is a host route in a duped-key chain, it will be first. + */ + if ((saved_t = t)->rn_mask == 0) + t = t->rn_dupedkey; + for (; t; t = t->rn_dupedkey) + /* + * Even if we don't match exactly as a host, + * we may match if the leaf we wound up at is + * a route to a net. + */ + if (t->rn_flags & RNF_NORMAL) { + if (rn_b <= t->rn_b) + return t; + } else if (rn_satisfies_leaf(v, t, matched_off)) + return t; + t = saved_t; + /* start searching up the tree */ + do { + struct radix_mask *m; + t = t->rn_p; + m = t->rn_mklist; + if (m) { + /* + * If non-contiguous masks ever become important + * we can restore the masking and open coding of + * the search and satisfaction test and put the + * calculation of "off" back before the "do". + */ + do { + if (m->rm_flags & RNF_NORMAL) { + if (rn_b <= m->rm_b) + return (m->rm_leaf); + } else { + off = min(t->rn_off, matched_off); + x = rn_search_m(v, t, m->rm_mask); + while (x && x->rn_mask != m->rm_mask) + x = x->rn_dupedkey; + if (x && rn_satisfies_leaf(v, x, off)) + return x; + } + m = m->rm_mklist; + } while (m); + } + } while (t != top); + return 0; +} + +#ifdef RN_DEBUG +int rn_nodenum; +struct radix_node *rn_clist; +int rn_saveinfo; +int rn_debug = 1; +#endif + +struct radix_node * +rn_newpair(v, b, nodes) + void *v; + int b; + struct radix_node nodes[2]; +{ + struct radix_node *tt = nodes, *t = tt + 1; + t->rn_b = b; + t->rn_bmask = 0x80 >> (b & 7); + t->rn_l = tt; + t->rn_off = b >> 3; + tt->rn_b = -1; + tt->rn_key = (caddr_t)v; + tt->rn_p = t; + tt->rn_flags = t->rn_flags = RNF_ACTIVE; +#ifdef RN_DEBUG + tt->rn_info = rn_nodenum++; + t->rn_info = rn_nodenum++; + tt->rn_twin = t; + tt->rn_ybro = rn_clist; + rn_clist = tt; +#endif + return t; +} + +struct radix_node * +rn_insert(v_arg, head, dupentry, nodes) + void *v_arg; + struct radix_node_head *head; + int *dupentry; + struct radix_node nodes[2]; +{ + caddr_t v = v_arg; + struct radix_node *top = head->rnh_treetop; + int head_off = top->rn_off, vlen = (int)*((u_char *)v); + struct radix_node *t = rn_search(v_arg, top); + caddr_t cp = v + head_off; + int b; + struct radix_node *tt; + +#ifdef RN_DEBUG + if (rn_debug) + log(LOG_DEBUG, "rn_insert(%p,%p,%p,%p)\n", v_arg, head, dupentry, nodes); +#endif + /* + * Find first bit at which v and t->rn_key differ + */ + { + caddr_t cp2 = t->rn_key + head_off; + int cmp_res; + caddr_t cplim = v + vlen; + + while (cp < cplim) + if (*cp2++ != *cp++) + goto on1; + *dupentry = 1; + return t; +on1: + *dupentry = 0; + cmp_res = (cp[-1] ^ cp2[-1]) & 0xff; + for (b = (cp - v) << 3; cmp_res; b--) + cmp_res >>= 1; + } + { + struct radix_node *p, *x = top; + cp = v; + do { + p = x; + if (cp[x->rn_off] & x->rn_bmask) + x = x->rn_r; + else + x = x->rn_l; + } while (b > (unsigned) x->rn_b); /* x->rn_b < b && x->rn_b >= 0 */ +#ifdef RN_DEBUG + if (rn_debug) + log(LOG_DEBUG, "rn_insert: Going In:\n"); // traverse(p); +#endif + t = rn_newpair(v_arg, b, nodes); + tt = t->rn_l; + if ((cp[p->rn_off] & p->rn_bmask) == 0) + p->rn_l = t; + else + p->rn_r = t; + x->rn_p = t; + t->rn_p = p; /* frees x, p as temp vars below */ + if ((cp[t->rn_off] & t->rn_bmask) == 0) { + t->rn_r = x; + } else { + t->rn_r = tt; + t->rn_l = 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(n_arg, search, skip) + int search, skip; + void *n_arg; +{ + caddr_t netmask = (caddr_t)n_arg; + struct radix_node *x; + caddr_t cp, cplim; + int b = 0, mlen, j; + int maskduplicated, m0, isnormal; + struct radix_node *saved_x; + static int last_zeroed = 0; + +#ifdef RN_DEBUG + if (rn_debug) + log(LOG_DEBUG, "rn_addmask(%p,%d,%d)\n", n_arg, search, skip); +#endif + mlen = *(u_char *)netmask; + if ((mlen = *(u_char *)netmask) > max_keylen) + mlen = max_keylen; + if (skip == 0) + skip = 1; + if (mlen <= skip) + return (mask_rnhead->rnh_nodes); + if (skip > 1) + Bcopy(rn_ones + 1, addmask_key + 1, skip - 1); + if ((m0 = mlen) > skip) + 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) { + if (m0 >= last_zeroed) + last_zeroed = mlen; + return (mask_rnhead->rnh_nodes); + } + if (m0 < last_zeroed) + Bzero(addmask_key + m0, last_zeroed - m0); + *addmask_key = last_zeroed = mlen; + x = rn_search(addmask_key, rn_masktop); + if (Bcmp(addmask_key, x->rn_key, mlen) != 0) + x = 0; + if (x || search) + return (x); + R_Malloc(x, struct radix_node *, max_keylen + 2 * sizeof (*x)); + if ((saved_x = x) == 0) + return (0); + Bzero(x, max_keylen + 2 * sizeof (*x)); + netmask = cp = (caddr_t)(x + 2); + Bcopy(addmask_key, cp, mlen); + x = rn_insert(cp, mask_rnhead, &maskduplicated, x); + if (maskduplicated) { +#if 0 + log(LOG_ERR, "rn_addmask: mask impossibly already in tree\n"); +#endif + Free(saved_x); + return (x); + } + /* + * Calculate index of mask, and check for normalcy. + */ + 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 (*cp != normal_chars[b] || cp != (cplim - 1)) + isnormal = 0; + } + b += (cp - netmask) << 3; + x->rn_b = -1 - b; + if (isnormal) + x->rn_flags |= RNF_NORMAL; + return (x); +} + +static int /* XXX: arbitrary ordering for non-contiguous masks */ +rn_lexobetter(m_arg, n_arg) + void *m_arg, *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(tt, next) + struct radix_node *tt; + struct radix_mask *next; +{ + struct radix_mask *m; + + MKGet(m); + if (m == 0) { +#if 0 + log(LOG_ERR, "Mask for route not entered\n"); +#endif + 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; +} + +struct radix_node * +rn_addroute(v_arg, n_arg, head, treenodes) + void *v_arg, *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; + +#ifdef RN_DEBUG + if (rn_debug) + log(LOG_DEBUG, "rn_addroute(%p,%p,%p,%p)\n", v_arg, n_arg, head, treenodes); +#endif + /* + * 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)) == 0) + 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. + * + * 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_p = x = t->rn_p; + t->rn_p = tt; + 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; + tt->rn_p = t; + if (tt->rn_dupedkey) + tt->rn_dupedkey->rn_p = 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) { + *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) != NULL; mp = &m->rm_mklist) + if (m->rm_b >= 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_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) != NULL; 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) { +#if 0 + 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(v_arg, netmask_arg, head) + void *v_arg, *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 == 0 || + 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)) == 0) + 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) { +#if 0 + log(LOG_ERR, "rn_delete: inconsistent annotation\n"); +#endif + return 0; /* dangling ref could cause disaster */ + } + } else { + if (m->rm_mask != tt->rn_mask) { +#if 0 + log(LOG_ERR, "rn_delete: inconsistent annotation\n"); +#endif + 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) != NULL; mp = &m->rm_mklist) + if (m == saved_m) { + *mp = m->rm_mklist; + MKFree(m); + break; + } + if (m == 0) { +#if 0 + log(LOG_ERR, "rn_delete: couldn't find our annotation\n"); +#endif + 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; + dupedkey = saved_tt->rn_dupedkey; + if (dupedkey) { + /* + * Here, tt is the deletion target and + * saved_tt is the head of the dupedkey chain. + */ + 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 { + /* 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) + tt->rn_dupedkey->rn_p = p; + } +#if 0 + else + log(LOG_ERR, "rn_delete: couldn't find us\n"); +#endif + } + 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) != NULL;) + 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 0 + if (m) + log(LOG_ERR, "%s %p at %p\n", + "rn_delete: Orphaned Mask", m, x); +#endif + } + } + /* + * 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(h, f, w) + struct radix_node_head *h; + int (*f) __P((struct radix_node *, void *)); + 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_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) != NULL) { + 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(head, off) + void **head; + int off; +{ + struct radix_node_head *rnh; + + if (*head) + return (1); + R_Malloc(rnh, struct radix_node_head *, sizeof (*rnh)); + if (rnh == 0) + return (0); + *head = rnh; + return rn_inithead0(rnh, off); +} + +int +rn_inithead0(rnh, off) + struct radix_node_head *rnh; + int off; +{ + struct radix_node *t, *tt, *ttt; + + Bzero(rnh, sizeof (*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() +{ + char *cp, *cplim; + + if (max_keylen == 0) { +#if 0 + log(LOG_ERR, + "rn_init: radix functions require max_keylen be set\n"); +#endif + return; + } + if (rn_zeros == NULL) { + R_Malloc(rn_zeros, char *, 3 * max_keylen); + } + if (rn_zeros == NULL) + panic("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((void *)&mask_rnhead, 0) == 0) + panic("rn_init 2"); +} + + +static int +rn_freenode(struct radix_node *n, void *p) +{ + struct radix_node_head *rnh = p; + struct radix_node *d; + + d = rnh->rnh_deladdr(n->rn_key, NULL, rnh); + if (d != NULL) { + FreeS(d, max_keylen + 2 * sizeof (*d)); + } + return 0; +} + + +void +rn_freehead(rnh) + struct radix_node_head *rnh; +{ + + (void)rn_walktree(rnh, rn_freenode, rnh); + + rnh->rnh_addaddr = NULL; + rnh->rnh_deladdr = NULL; + rnh->rnh_matchaddr = NULL; + rnh->rnh_lookup = NULL; + rnh->rnh_walktree = NULL; + + Free(rnh); +} + + +void +rn_fini() +{ + struct radix_mask *m; + + if (rn_zeros != NULL) { + FreeS(rn_zeros, 3 * max_keylen); + rn_zeros = NULL; + } + + if (mask_rnhead != NULL) { + rn_freehead(mask_rnhead); + mask_rnhead = NULL; + } + + while ((m = rn_mkfreelist) != NULL) { + rn_mkfreelist = m->rm_mklist; + KFREE(m); + } +} + + +#ifdef USE_MAIN + +typedef struct myst { + addrfamily_t dst; + addrfamily_t mask; + struct radix_node nodes[2]; +} myst_t; + +int +main(int argc, char *argv[]) +{ + struct radix_node_head *rnh; + struct radix_node *rn; + addrfamily_t af, mf; + myst_t st1, st2, *stp; + + memset(&st1, 0, sizeof(st1)); + memset(&st2, 0, sizeof(st2)); + memset(&af, 0, sizeof(af)); + + rn_init(); + + rnh = NULL; + rn_inithead(&rnh, offsetof(addrfamily_t, adf_addr) << 3); + + st1.dst.adf_len = sizeof(st1); + st1.mask.adf_len = sizeof(st1); + st1.dst.adf_addr.in4.s_addr = inet_addr("127.0.0.0"); + st1.mask.adf_addr.in4.s_addr = inet_addr("255.0.0.0"); + rn = rnh->rnh_addaddr(&st1.dst, &st1.mask, rnh, st1.nodes); + printf("add.1 %p\n", rn); + + st2.dst.adf_len = sizeof(st2); + st2.mask.adf_len = sizeof(st2); + st2.dst.adf_addr.in4.s_addr = inet_addr("127.0.1.0"); + st2.mask.adf_addr.in4.s_addr = inet_addr("255.255.255.0"); + rn = rnh->rnh_addaddr(&st2.dst, &st2.mask, rnh, st2.nodes); + printf("add.2 %p\n", rn); + + af.adf_len = sizeof(af); + af.adf_addr.in4.s_addr = inet_addr("127.0.1.0"); + rn = rnh->rnh_matchaddr(&af, rnh); + if (rn != NULL) { + printf("1.lookup = %p key %p mask %p\n", rn, rn->rn_key, rn->rn_mask); + stp = rn->rn_key; + printf("%s/", inet_ntoa(stp->dst.adf_addr.in4)); + stp = rn->rn_mask; + printf("%s\n", inet_ntoa(stp->dst.adf_addr.in4)); + } + + mf.adf_len = sizeof(mf); + mf.adf_addr.in4.s_addr = inet_addr("255.255.255.0"); + rn = rnh->rnh_lookup(&af, &mf, rnh); + if (rn != NULL) { + printf("2.lookup = %p key %p mask %p\n", rn, rn->rn_key, rn->rn_mask); + stp = rn->rn_key; + printf("%s/", inet_ntoa(stp->dst.adf_addr.in4)); + stp = rn->rn_mask; + printf("%s\n", inet_ntoa(stp->dst.adf_addr.in4)); + } + + af.adf_len = sizeof(af); + af.adf_addr.in4.s_addr = inet_addr("126.0.0.1"); + rn = rnh->rnh_matchaddr(&af, rnh); + if (rn != NULL) { + printf("3.lookup = %p key %p mask %p\n", rn, rn->rn_key, rn->rn_mask); + stp = rn->rn_key; + printf("%s/", inet_ntoa(stp->dst.adf_addr.in4)); + stp = rn->rn_mask; + printf("%s\n", inet_ntoa(stp->dst.adf_addr.in4)); + } + + return 0; +} + + +void +log(int level, char *format, ...) +{ + va_list ap; + + va_start(ap, format); + vfprintf(stderr, format, ap); + va_end(ap); +} +#endif + + +#ifndef _KERNEL +void +panic(char *str) +{ + fputs(str, stderr); + abort(); +} +#endif |