1122394Sharti/* 2122394Sharti * Copyright (c) 2001-2003 3122394Sharti * Fraunhofer Institute for Open Communication Systems (FhG Fokus). 4122394Sharti * All rights reserved. 5122394Sharti * 6122394Sharti * Author: Harti Brandt <harti@freebsd.org> 7133211Sharti * 8133211Sharti * Redistribution and use in source and binary forms, with or without 9133211Sharti * modification, are permitted provided that the following conditions 10133211Sharti * are met: 11133211Sharti * 1. Redistributions of source code must retain the above copyright 12133211Sharti * notice, this list of conditions and the following disclaimer. 13122394Sharti * 2. Redistributions in binary form must reproduce the above copyright 14122394Sharti * notice, this list of conditions and the following disclaimer in the 15122394Sharti * documentation and/or other materials provided with the distribution. 16133211Sharti * 17133211Sharti * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18133211Sharti * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19133211Sharti * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20133211Sharti * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE 21133211Sharti * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22133211Sharti * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23133211Sharti * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24133211Sharti * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25133211Sharti * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26133211Sharti * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27133211Sharti * SUCH DAMAGE. 28122394Sharti * 29133211Sharti * $Begemot: bsnmp/snmp_mibII/mibII_nettomedia.c,v 1.8 2004/08/06 08:47:03 brandt Exp $ 30122394Sharti * 31122394Sharti * Read-only implementation of the Arp table (ipNetToMediaTable) 32122394Sharti * 33122394Sharti * The problem with the table is, that we don't receive routing message 34122394Sharti * when a) an arp table entry is resolved and b) when an arp table entry is 35122394Sharti * deleted automatically. Therefor we need to poll the table from time to 36122394Sharti * time. 37122394Sharti */ 38122394Sharti#include "mibII.h" 39122394Sharti#include "mibII_oid.h" 40122394Sharti 41122394Sharti#define ARPREFRESH 30 42122394Sharti 43122394Shartistruct mibarp * 44122394Shartimib_find_arp(const struct mibif *ifp, struct in_addr in) 45122394Sharti{ 46122394Sharti struct mibarp *at; 47133211Sharti uint32_t a = ntohl(in.s_addr); 48122394Sharti 49122394Sharti if (get_ticks() >= mibarpticks + ARPREFRESH) 50122394Sharti mib_arp_update(); 51122394Sharti 52122394Sharti TAILQ_FOREACH(at, &mibarp_list, link) 53122394Sharti if (at->index.subs[0] == ifp->index && 54122394Sharti (at->index.subs[1] == ((a >> 24) & 0xff)) && 55122394Sharti (at->index.subs[2] == ((a >> 16) & 0xff)) && 56122394Sharti (at->index.subs[3] == ((a >> 8) & 0xff)) && 57122394Sharti (at->index.subs[4] == ((a >> 0) & 0xff))) 58122394Sharti return (at); 59122394Sharti return (NULL); 60122394Sharti} 61122394Sharti 62122394Shartistruct mibarp * 63122394Shartimib_arp_create(const struct mibif *ifp, struct in_addr in, const u_char *phys, 64122394Sharti size_t physlen) 65122394Sharti{ 66122394Sharti struct mibarp *at; 67133211Sharti uint32_t a = ntohl(in.s_addr); 68122394Sharti 69122394Sharti if ((at = malloc(sizeof(*at))) == NULL) 70122394Sharti return (NULL); 71122394Sharti at->flags = 0; 72122394Sharti 73122394Sharti at->index.len = 5; 74122394Sharti at->index.subs[0] = ifp->index; 75122394Sharti at->index.subs[1] = (a >> 24) & 0xff; 76122394Sharti at->index.subs[2] = (a >> 16) & 0xff; 77122394Sharti at->index.subs[3] = (a >> 8) & 0xff; 78122394Sharti at->index.subs[4] = (a >> 0) & 0xff; 79122394Sharti if ((at->physlen = physlen) > sizeof(at->phys)) 80122394Sharti at->physlen = sizeof(at->phys); 81122394Sharti memcpy(at->phys, phys, at->physlen); 82122394Sharti 83122394Sharti INSERT_OBJECT_OID(at, &mibarp_list); 84122394Sharti 85122394Sharti return (at); 86122394Sharti} 87122394Sharti 88122394Shartivoid 89122394Shartimib_arp_delete(struct mibarp *at) 90122394Sharti{ 91122394Sharti TAILQ_REMOVE(&mibarp_list, at, link); 92122394Sharti free(at); 93122394Sharti} 94122394Sharti 95122394Shartiint 96122394Shartiop_nettomedia(struct snmp_context *ctx __unused, struct snmp_value *value, 97122394Sharti u_int sub, u_int iidx __unused, enum snmp_op op) 98122394Sharti{ 99122394Sharti struct mibarp *at; 100122394Sharti 101122394Sharti at = NULL; /* gcc */ 102122394Sharti 103122394Sharti if (get_ticks() >= mibarpticks + ARPREFRESH) 104122394Sharti mib_arp_update(); 105122394Sharti 106122394Sharti switch (op) { 107122394Sharti 108122394Sharti case SNMP_OP_GETNEXT: 109122394Sharti if ((at = NEXT_OBJECT_OID(&mibarp_list, &value->var, sub)) == NULL) 110122394Sharti return (SNMP_ERR_NOSUCHNAME); 111122394Sharti index_append(&value->var, sub, &at->index); 112122394Sharti break; 113122394Sharti 114122394Sharti case SNMP_OP_GET: 115122394Sharti if ((at = FIND_OBJECT_OID(&mibarp_list, &value->var, sub)) == NULL) 116122394Sharti return (SNMP_ERR_NOSUCHNAME); 117122394Sharti break; 118122394Sharti 119122394Sharti case SNMP_OP_SET: 120122394Sharti if ((at = FIND_OBJECT_OID(&mibarp_list, &value->var, sub)) == NULL) 121122394Sharti return (SNMP_ERR_NO_CREATION); 122122394Sharti return (SNMP_ERR_NOT_WRITEABLE); 123122394Sharti 124122394Sharti case SNMP_OP_ROLLBACK: 125122394Sharti case SNMP_OP_COMMIT: 126122394Sharti abort(); 127122394Sharti } 128122394Sharti 129122394Sharti switch (value->var.subs[sub - 1]) { 130122394Sharti 131122394Sharti case LEAF_ipNetToMediaIfIndex: 132122394Sharti value->v.integer = at->index.subs[0]; 133122394Sharti break; 134122394Sharti 135122394Sharti case LEAF_ipNetToMediaPhysAddress: 136122394Sharti return (string_get(value, at->phys, at->physlen)); 137122394Sharti 138122394Sharti case LEAF_ipNetToMediaNetAddress: 139122394Sharti value->v.ipaddress[0] = at->index.subs[1]; 140122394Sharti value->v.ipaddress[1] = at->index.subs[2]; 141122394Sharti value->v.ipaddress[2] = at->index.subs[3]; 142122394Sharti value->v.ipaddress[3] = at->index.subs[4]; 143122394Sharti break; 144122394Sharti 145122394Sharti case LEAF_ipNetToMediaType: 146122394Sharti value->v.integer = (at->flags & MIBARP_PERM) ? 4 : 3; 147122394Sharti break; 148122394Sharti } 149122394Sharti return (SNMP_ERR_NOERROR); 150122394Sharti} 151