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 the 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 }; 86 #define MIBIF_PRIV(IFP) ((struct mibif_private *)((IFP)->private)) 87 88 /* 89 * Interface addresses. 90 */ 91 TAILQ_HEAD(mibifa_list, mibifa); 92 enum { 93 MIBIFA_FOUND = 0x0001, 94 MIBIFA_DESTROYED = 0x0002, 95 }; 96 97 /* 98 * Receive addresses 99 */ 100 TAILQ_HEAD(mibrcvaddr_list, mibrcvaddr); 101 enum { 102 MIBRCVADDR_FOUND = 0x00010000, 103 }; 104 105 /* 106 * Interface index mapping. The problem here is, that if the same interface 107 * is reinstantiated (for examble by unloading and loading the hardware driver) 108 * we must use the same index for this interface. For dynamic interfaces 109 * (clip, lane) we must use a fresh index, each time a new interface is created. 110 * To differentiate between these types of interfaces we use the following table 111 * which contains an entry for each dynamic interface type. All other interface 112 * types are supposed to be static. The mibindexmap contains an entry for 113 * all interfaces. The mibif pointer is NULL, if the interface doesn't exist 114 * anymore. 115 */ 116 struct mibdynif { 117 SLIST_ENTRY(mibdynif) link; 118 char name[IFNAMSIZ]; 119 }; 120 SLIST_HEAD(mibdynif_list, mibdynif); 121 122 struct mibindexmap { 123 STAILQ_ENTRY(mibindexmap) link; 124 u_short sysindex; 125 u_int ifindex; 126 struct mibif *mibif; /* may be NULL */ 127 char name[IFNAMSIZ]; 128 }; 129 STAILQ_HEAD(mibindexmap_list, mibindexmap); 130 131 /* 132 * Interface stacking. The generic code cannot know how the interfaces stack. 133 * For this reason it instantiates only the x.0 and 0.x table elements. All 134 * others have to be instantiated by the interface specific modules. 135 * The table is read-only. 136 */ 137 struct mibifstack { 138 TAILQ_ENTRY(mibifstack) link; 139 struct asn_oid index; 140 }; 141 TAILQ_HEAD(mibifstack_list, mibifstack); 142 143 /* 144 * NetToMediaTable (ArpTable) 145 */ 146 struct mibarp { 147 TAILQ_ENTRY(mibarp) link; 148 struct asn_oid index; /* contains both the ifindex and addr */ 149 u_char phys[128]; /* the physical address */ 150 u_int physlen; /* and its length */ 151 u_int flags; 152 }; 153 TAILQ_HEAD(mibarp_list, mibarp); 154 enum { 155 MIBARP_FOUND = 0x00010000, 156 MIBARP_PERM = 0x00000001, 157 }; 158 159 /* 160 * New if registrations 161 */ 162 struct newifreg { 163 TAILQ_ENTRY(newifreg) link; 164 const struct lmodule *mod; 165 int (*func)(struct mibif *); 166 }; 167 TAILQ_HEAD(newifreg_list, newifreg); 168 169 /* list of all IP addresses */ 170 extern struct mibifa_list mibifa_list; 171 172 /* list of all interfaces */ 173 extern struct mibif_list mibif_list; 174 175 /* list of dynamic interface names */ 176 extern struct mibdynif_list mibdynif_list; 177 178 /* list of all interface index mappings */ 179 extern struct mibindexmap_list mibindexmap_list; 180 181 /* list of all stacking entries */ 182 extern struct mibifstack_list mibifstack_list; 183 184 /* list of all receive addresses */ 185 extern struct mibrcvaddr_list mibrcvaddr_list; 186 187 /* list of all NetToMedia entries */ 188 extern struct mibarp_list mibarp_list; 189 190 /* number of interfaces */ 191 extern int32_t mib_if_number; 192 193 /* last change of interface table */ 194 extern uint64_t mib_iftable_last_change; 195 196 /* last change of stack table */ 197 extern uint64_t mib_ifstack_last_change; 198 199 /* if this is set, one of our lists may be bad. refresh them when idle */ 200 extern int mib_iflist_bad; 201 202 /* last time refreshed */ 203 extern uint64_t mibarpticks; 204 205 /* info on system clocks */ 206 extern struct clockinfo clockinfo; 207 208 /* baud rate of fastest interface */ 209 extern uint64_t mibif_maxspeed; 210 211 /* user-forced update interval */ 212 extern u_int mibif_force_hc_update_interval; 213 214 /* current update interval */ 215 extern u_int mibif_hc_update_interval; 216 217 /* re-compute update interval */ 218 void mibif_reset_hc_timer(void); 219 220 /* interfaces' data poll interval */ 221 extern u_int mibII_poll_ticks; 222 223 /* restart the data poll timer */ 224 void mibif_restart_mibII_poll_timer(void); 225 226 #define MIBII_POLL_TICKS 100 227 228 /* get interfaces and interface addresses. */ 229 void mib_fetch_interfaces(void); 230 231 /* check whether this interface(type) is dynamic */ 232 int mib_if_is_dyn(const char *name); 233 234 /* destroy an interface address */ 235 int mib_destroy_ifa(struct mibifa *); 236 237 /* restituate a deleted interface address */ 238 void mib_undestroy_ifa(struct mibifa *); 239 240 /* change interface address */ 241 int mib_modify_ifa(struct mibifa *); 242 243 /* undo if address modification */ 244 void mib_unmodify_ifa(struct mibifa *); 245 246 /* create an interface address */ 247 struct mibifa * mib_create_ifa(u_int ifindex, struct in_addr addr, struct in_addr mask, struct in_addr bcast); 248 249 /* delete a freshly created address */ 250 void mib_uncreate_ifa(struct mibifa *); 251 252 /* create/delete arp entries */ 253 struct mibarp *mib_arp_create(const struct mibif *, struct in_addr, const u_char *, size_t); 254 void mib_arp_delete(struct mibarp *); 255 256 /* find arp entry */ 257 struct mibarp *mib_find_arp(const struct mibif *, struct in_addr); 258 259 /* update arp table */ 260 void mib_arp_update(void); 261 262 /* fetch routing table */ 263 u_char *mib_fetch_rtab(int af, int info, int arg, size_t *lenp); 264 265 /* process routing message */ 266 void mib_sroute_process(struct rt_msghdr *, struct sockaddr *, 267 struct sockaddr *, struct sockaddr *); 268 269 /* send a routing message */ 270 void mib_send_rtmsg(struct rt_msghdr *, struct sockaddr *, 271 struct sockaddr *, struct sockaddr *); 272 273 /* extract addresses from routing message */ 274 void mib_extract_addrs(int, u_char *, struct sockaddr **); 275 276 /* fetch routing table */ 277 int mib_fetch_route(void); 278