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Annotation of XNU/bsd/netiso/tuba_table.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * The contents of this file constitute Original Code as defined in and
        !             7:  * are subject to the Apple Public Source License Version 1.1 (the
        !             8:  * "License").  You may not use this file except in compliance with the
        !             9:  * License.  Please obtain a copy of the License at
        !            10:  * http://www.apple.com/publicsource and read it before using this file.
        !            11:  * 
        !            12:  * This Original Code and all software distributed under the License are
        !            13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            17:  * License for the specific language governing rights and limitations
        !            18:  * under the License.
        !            19:  * 
        !            20:  * @APPLE_LICENSE_HEADER_END@
        !            21:  */
        !            22: /*
        !            23:  * Copyright (c) 1992, 1993
        !            24:  *     The Regents of the University of California.  All rights reserved.
        !            25:  *
        !            26:  * Redistribution and use in source and binary forms, with or without
        !            27:  * modification, are permitted provided that the following conditions
        !            28:  * are met:
        !            29:  * 1. Redistributions of source code must retain the above copyright
        !            30:  *    notice, this list of conditions and the following disclaimer.
        !            31:  * 2. Redistributions in binary form must reproduce the above copyright
        !            32:  *    notice, this list of conditions and the following disclaimer in the
        !            33:  *    documentation and/or other materials provided with the distribution.
        !            34:  * 3. All advertising materials mentioning features or use of this software
        !            35:  *    must display the following acknowledgement:
        !            36:  *     This product includes software developed by the University of
        !            37:  *     California, Berkeley and its contributors.
        !            38:  * 4. Neither the name of the University nor the names of its contributors
        !            39:  *    may be used to endorse or promote products derived from this software
        !            40:  *    without specific prior written permission.
        !            41:  *
        !            42:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            43:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            44:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            45:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            46:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            47:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            48:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            49:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            50:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            51:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            52:  * SUCH DAMAGE.
        !            53:  *
        !            54:  *     @(#)tuba_table.c        8.2 (Berkeley) 11/15/93
        !            55:  */
        !            56: #include <sys/param.h>
        !            57: #include <sys/systm.h>
        !            58: #include <sys/proc.h>
        !            59: #include <sys/mbuf.h>
        !            60: #include <sys/socket.h>
        !            61: #include <sys/socketvar.h>
        !            62: #include <sys/domain.h>
        !            63: #include <sys/protosw.h>
        !            64: #include <sys/ioctl.h>
        !            65: #include <sys/time.h>
        !            66: #include <sys/kernel.h>
        !            67: 
        !            68: #include <net/if.h>
        !            69: #include <net/radix.h>
        !            70: 
        !            71: #include <netiso/iso.h>
        !            72: #include <netiso/tuba_table.h>
        !            73: 
        !            74: int    tuba_table_size;
        !            75: struct tuba_cache **tuba_table;
        !            76: struct radix_node_head *tuba_tree;
        !            77: extern int arpt_keep, arpt_prune;      /* use same values as arp cache */
        !            78: 
        !            79: void
        !            80: tuba_timer()
        !            81: {
        !            82:        int s = splnet();
        !            83:        int     i;
        !            84:        register struct tuba_cache *tc;
        !            85:        long    timelimit = time.tv_sec - arpt_keep;
        !            86: 
        !            87:        timeout(tuba_timer, (caddr_t)0, arpt_prune * hz);
        !            88:        for (i = tuba_table_size; i > 0; i--)
        !            89:                if ((tc = tuba_table[i]) && (tc->tc_refcnt == 0) &&
        !            90:                    (tc->tc_time < timelimit)) {
        !            91:                        tuba_table[i] = 0;
        !            92:                        rn_delete(&tc->tc_siso.siso_addr, NULL, tuba_tree);
        !            93:                        FREE((caddr_t)tc, M_RTABLE);
        !            94:                }
        !            95:        splx(s);
        !            96: }
        !            97: 
        !            98: tuba_table_init()
        !            99: {
        !           100:        rn_inithead((void **)&tuba_tree, 40);
        !           101:        timeout(tuba_timer, (caddr_t)0, arpt_prune * hz);
        !           102: }
        !           103: 
        !           104: int
        !           105: tuba_lookup(siso, wait)
        !           106:        register struct sockaddr_iso *siso;
        !           107: {
        !           108:        struct radix_node *rn, *rn_match();
        !           109:        register struct tuba_cache *tc;
        !           110:        struct tuba_cache **new;
        !           111:        int dupentry = 0, sum_a = 0, sum_b = 0, old_size, i;
        !           112: 
        !           113:        if ((rn = rn_match((caddr_t)&siso->siso_addr, tuba_tree->rnh_treetop))
        !           114:             && ((rn->rn_flags & RNF_ROOT) == 0)) {
        !           115:                tc = (struct tuba_cache *)rn;
        !           116:                tc->tc_time = time.tv_sec;
        !           117:                return (tc->tc_index);
        !           118:        }
        !           119: //     if ((tc = (struct tuba_cache *)malloc(sizeof(*tc), M_RTABLE, wait))
        !           120: //             == NULL)
        !           121:        if (wait == M_DONTWAIT)
        !           122:                MALLOC(tc, struct tuba_cache *, sizeof(*tc), M_RTABLE, M_NOWAIT);
        !           123:        else
        !           124:                MALLOC(tc, struct tuba_cache *, sizeof(*tc), M_RTABLE, M_WAITOK);
        !           125:        if (tc == NULL)
        !           126:                return (0);
        !           127:        bzero((caddr_t)tc, sizeof (*tc));
        !           128:        bcopy(siso->siso_data, tc->tc_siso.siso_data,
        !           129:                tc->tc_siso.siso_nlen =  siso->siso_nlen);
        !           130:        rn_insert(&tc->tc_siso.siso_addr, tuba_tree, &dupentry, tc->tc_nodes);
        !           131:        if (dupentry)
        !           132:                panic("tuba_lookup 1");
        !           133:        tc->tc_siso.siso_family = AF_ISO;
        !           134:        tc->tc_siso.siso_len = sizeof(tc->tc_siso);
        !           135:        tc->tc_time = time.tv_sec;
        !           136:        for (i = sum_a = tc->tc_siso.siso_nlen; --i >= 0; )
        !           137:                (i & 1 ? sum_a : sum_b) += (u_char)tc->tc_siso.siso_data[i];
        !           138:        REDUCE(tc->tc_sum, (sum_a << 8) + sum_b);
        !           139:        HTONS(tc->tc_sum);
        !           140:        SWAB(tc->tc_ssum, tc->tc_sum);
        !           141:        for (i = tuba_table_size; i > 0; i--)
        !           142:                if (tuba_table[i] == 0)
        !           143:                        goto fixup;
        !           144:        old_size = tuba_table_size;
        !           145:        if (tuba_table_size == 0)
        !           146:                tuba_table_size = 15;
        !           147:        if (tuba_table_size > 0x7fff)
        !           148:                return (0);
        !           149:        tuba_table_size = 1 + 2 * tuba_table_size;
        !           150:        i = (tuba_table_size + 1) * sizeof(tc);
        !           151: //     new = (struct tuba_cache **)malloc((unsigned)i, M_RTABLE, wait);
        !           152:        if (wait == M_DONTWAIT)
        !           153:                MALLOC(new, struct tuba_cache **, i, M_RTABLE, M_NOWAIT);
        !           154:        else
        !           155:                MALLOC(new, struct tuba_cache **, i, M_RTABLE, M_WAITOK);
        !           156:        if (new == 0) {
        !           157:                tuba_table_size = old_size;
        !           158:                rn_delete(&tc->tc_siso.siso_addr, NULL, tuba_tree);
        !           159:                FREE((caddr_t)tc, M_RTABLE);
        !           160:                return (0);
        !           161:        }
        !           162:        bzero((caddr_t)new, (unsigned)i);
        !           163:        if (tuba_table) {
        !           164:                bcopy((caddr_t)tuba_table, (caddr_t)new, i >> 1);
        !           165:                FREE((caddr_t)tuba_table, M_RTABLE);
        !           166:        }
        !           167:        tuba_table = new;
        !           168:        i = tuba_table_size;
        !           169: fixup:
        !           170:        tuba_table[i] = tc;
        !           171:        tc->tc_index = i;
        !           172:        return (tc->tc_index);
        !           173: }

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