1 /* 2 * Copyright (c) 2001-2003 3 * Fraunhofer Institute for Open Communication Systems (FhG Fokus). 4 * All rights reserved. 5 * 6 * Author: Harti Brandt <harti@freebsd.org> 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $Begemot: bsnmp/snmp_mibII/mibII.h,v 1.16 2006/02/14 09:04:19 brandt_h Exp $ 30 * 31 * Implementation of the interfaces and IP groups of MIB-II. 32 */ 33 #include <sys/param.h> 34 #include <sys/sysctl.h> 35 #include <sys/socket.h> 36 #include <sys/sockio.h> 37 #include <sys/syslog.h> 38 #include <sys/time.h> 39 #include <stdint.h> 40 #include <stdio.h> 41 #include <stdlib.h> 42 #include <string.h> 43 #include <errno.h> 44 #include <unistd.h> 45 #include <err.h> 46 #include <ctype.h> 47 #include <net/if.h> 48 #include <net/if_dl.h> 49 #include <net/if_mib.h> 50 #include <net/route.h> 51 #include <netinet/in.h> 52 #include <arpa/inet.h> 53 54 #include "asn1.h" 55 #include "snmp.h" 56 #include "snmpmod.h" 57 #include "snmp_mibII.h" 58 #include "mibII_tree.h" 59 60 /* maximum size of interface alias unless overridden with net.ifdescr_maxlen */ 61 #define MIBIF_ALIAS_SIZE (64 + 1) 62 #define MIBIF_ALIAS_SIZE_MAX 1024 63 64 /* 65 * Interface list and flags. 66 */ 67 TAILQ_HEAD(mibif_list, mibif); 68 enum { 69 MIBIF_FOUND = 0x0001, 70 MIBIF_HIGHSPEED = 0x0002, 71 MIBIF_VERYHIGHSPEED = 0x0004, 72 }; 73 74 /* 75 * Private mibif data - hang off from the mibif. 76 */ 77 struct mibif_private { 78 uint64_t hc_inoctets; 79 uint64_t hc_outoctets; 80 uint64_t hc_omcasts; 81 uint64_t hc_opackets; 82 uint64_t hc_imcasts; 83 uint64_t hc_ipackets; 84 }; 85 #define MIBIF_PRIV(IFP) ((struct mibif_private *)((IFP)->private)) 86 87 /* 88 * Interface addresses. 89 */ 90 TAILQ_HEAD(mibifa_list, mibifa); 91 enum { 92 MIBIFA_FOUND = 0x0001, 93 MIBIFA_DESTROYED = 0x0002, 94 }; 95 96 /* 97 * Receive addresses 98 */ 99 TAILQ_HEAD(mibrcvaddr_list, mibrcvaddr); 100 enum { 101 MIBRCVADDR_FOUND = 0x00010000, 102 }; 103 104 /* 105 * Interface index mapping. The problem here is, that if the same interface 106 * is reinstantiated (for examble by unloading and loading the hardware driver) 107 * we must use the same index for this interface. For dynamic interfaces 108 * (clip, lane) we must use a fresh index, each time a new interface is created. 109 * To differentiate between these types of interfaces we use the following table 110 * which contains an entry for each dynamic interface type. All other interface 111 * types are supposed to be static. The mibindexmap contains an entry for 112 * all interfaces. The mibif pointer is NULL, if the interface doesn't exist 113 * anymore. 114 */ 115 struct mibdynif { 116 SLIST_ENTRY(mibdynif) link; 117 char name[IFNAMSIZ]; 118 }; 119 SLIST_HEAD(mibdynif_list, mibdynif); 120 121 struct mibindexmap { 122 STAILQ_ENTRY(mibindexmap) link; 123 u_short sysindex; 124 u_int ifindex; 125 struct mibif *mibif; /* may be NULL */ 126 char name[IFNAMSIZ]; 127 }; 128 STAILQ_HEAD(mibindexmap_list, mibindexmap); 129 130 /* 131 * Interface stacking. The generic code cannot know how the interfaces stack. 132 * For this reason it instantiates only the x.0 and 0.x table elements. All 133 * others have to be instantiated by the interface specific modules. 134 * The table is read-only. 135 */ 136 struct mibifstack { 137 TAILQ_ENTRY(mibifstack) link; 138 struct asn_oid index; 139 }; 140 TAILQ_HEAD(mibifstack_list, mibifstack); 141 142 /* 143 * NetToMediaTable (ArpTable) 144 */ 145 struct mibarp { 146 TAILQ_ENTRY(mibarp) link; 147 struct asn_oid index; /* contains both the ifindex and addr */ 148 u_char phys[128]; /* the physical address */ 149 u_int physlen; /* and its length */ 150 u_int flags; 151 }; 152 TAILQ_HEAD(mibarp_list, mibarp); 153 enum { 154 MIBARP_FOUND = 0x00010000, 155 MIBARP_PERM = 0x00000001, 156 }; 157 158 /* 159 * New if registrations 160 */ 161 struct newifreg { 162 TAILQ_ENTRY(newifreg) link; 163 const struct lmodule *mod; 164 int (*func)(struct mibif *); 165 }; 166 TAILQ_HEAD(newifreg_list, newifreg); 167 168 /* list of all IP addresses */ 169 extern struct mibifa_list mibifa_list; 170 171 /* list of all interfaces */ 172 extern struct mibif_list mibif_list; 173 174 /* list of dynamic interface names */ 175 extern struct mibdynif_list mibdynif_list; 176 177 /* list of all interface index mappings */ 178 extern struct mibindexmap_list mibindexmap_list; 179 180 /* list of all stacking entries */ 181 extern struct mibifstack_list mibifstack_list; 182 183 /* list of all receive addresses */ 184 extern struct mibrcvaddr_list mibrcvaddr_list; 185 186 /* list of all NetToMedia entries */ 187 extern struct mibarp_list mibarp_list; 188 189 /* number of interfaces */ 190 extern int32_t mib_if_number; 191 192 /* last change of interface table */ 193 extern uint64_t mib_iftable_last_change; 194 195 /* last change of stack table */ 196 extern uint64_t mib_ifstack_last_change; 197 198 /* if this is set, one of our lists may be bad. refresh them when idle */ 199 extern int mib_iflist_bad; 200 201 /* last time refreshed */ 202 extern uint64_t mibarpticks; 203 204 /* info on system clocks */ 205 extern struct clockinfo clockinfo; 206 207 /* baud rate of fastest interface */ 208 extern uint64_t mibif_maxspeed; 209 210 /* user-forced update interval */ 211 extern u_int mibif_force_hc_update_interval; 212 213 /* current update interval */ 214 extern u_int mibif_hc_update_interval; 215 216 /* re-compute update interval */ 217 void mibif_reset_hc_timer(void); 218 219 /* interfaces' data poll interval */ 220 extern u_int mibII_poll_ticks; 221 222 /* restart the data poll timer */ 223 void mibif_restart_mibII_poll_timer(void); 224 225 #define MIBII_POLL_TICKS 100 226 227 /* get interfaces and interface addresses. */ 228 void mib_fetch_interfaces(void); 229 230 /* check whether this interface(type) is dynamic */ 231 int mib_if_is_dyn(const char *name); 232 233 /* destroy an interface address */ 234 int mib_destroy_ifa(struct mibifa *); 235 236 /* restituate a deleted interface address */ 237 void mib_undestroy_ifa(struct mibifa *); 238 239 /* change interface address */ 240 int mib_modify_ifa(struct mibifa *); 241 242 /* undo if address modification */ 243 void mib_unmodify_ifa(struct mibifa *); 244 245 /* create an interface address */ 246 struct mibifa * mib_create_ifa(u_int ifindex, struct in_addr addr, struct in_addr mask, struct in_addr bcast); 247 248 /* delete a freshly created address */ 249 void mib_uncreate_ifa(struct mibifa *); 250 251 /* create/delete arp entries */ 252 struct mibarp *mib_arp_create(const struct mibif *, struct in_addr, const u_char *, size_t); 253 void mib_arp_delete(struct mibarp *); 254 255 /* find arp entry */ 256 struct mibarp *mib_find_arp(const struct mibif *, struct in_addr); 257 258 /* update arp table */ 259 void mib_arp_update(void); 260 261 /* fetch routing table */ 262 u_char *mib_fetch_rtab(int af, int info, int arg, size_t *lenp); 263 264 /* process routing message */ 265 void mib_sroute_process(struct rt_msghdr *, struct sockaddr *, 266 struct sockaddr *, struct sockaddr *); 267 268 /* send a routing message */ 269 void mib_send_rtmsg(struct rt_msghdr *, struct sockaddr *, 270 struct sockaddr *, struct sockaddr *); 271 272 /* extract addresses from routing message */ 273 void mib_extract_addrs(int, u_char *, struct sockaddr **); 274 275 /* fetch routing table */ 276 int mib_fetch_route(void); 277