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/*
61 * Interface list and flags.
62 */
63TAILQ_HEAD(mibif_list, mibif);
64enum {
65	MIBIF_FOUND		= 0x0001,
66	MIBIF_HIGHSPEED		= 0x0002,
67	MIBIF_VERYHIGHSPEED	= 0x0004,
68};
69
70/*
71 * Private mibif data - hang off from the mibif.
72 */
73struct mibif_private {
74	uint64_t	hc_inoctets;
75	uint64_t	hc_outoctets;
76	uint64_t	hc_omcasts;
77	uint64_t	hc_opackets;
78	uint64_t	hc_imcasts;
79	uint64_t	hc_ipackets;
80};
81#define	MIBIF_PRIV(IFP) ((struct mibif_private *)((IFP)->private))
82
83/*
84 * Interface addresses.
85 */
86TAILQ_HEAD(mibifa_list, mibifa);
87enum {
88	MIBIFA_FOUND	 = 0x0001,
89	MIBIFA_DESTROYED = 0x0002,
90};
91
92/*
93 * Receive addresses
94 */
95TAILQ_HEAD(mibrcvaddr_list, mibrcvaddr);
96enum {
97	MIBRCVADDR_FOUND	= 0x00010000,
98};
99
100/*
101 * Interface index mapping. The problem here is, that if the same interface
102 * is reinstantiated (for examble by unloading and loading the hardware driver)
103 * we must use the same index for this interface. For dynamic interfaces
104 * (clip, lane) we must use a fresh index, each time a new interface is created.
105 * To differentiate between these types of interfaces we use the following table
106 * which contains an entry for each dynamic interface type. All other interface
107 * types are supposed to be static. The mibindexmap contains an entry for
108 * all interfaces. The mibif pointer is NULL, if the interface doesn't exist
109 * anymore.
110 */
111struct mibdynif {
112	SLIST_ENTRY(mibdynif) link;
113	char	name[IFNAMSIZ];
114};
115SLIST_HEAD(mibdynif_list, mibdynif);
116
117struct mibindexmap {
118	STAILQ_ENTRY(mibindexmap) link;
119	u_short		sysindex;
120	u_int		ifindex;
121	struct mibif	*mibif;		/* may be NULL */
122	char		name[IFNAMSIZ];
123};
124STAILQ_HEAD(mibindexmap_list, mibindexmap);
125
126/*
127 * Interface stacking. The generic code cannot know how the interfaces stack.
128 * For this reason it instantiates only the x.0 and 0.x table elements. All
129 * others have to be instantiated by the interface specific modules.
130 * The table is read-only.
131 */
132struct mibifstack {
133	TAILQ_ENTRY(mibifstack) link;
134	struct asn_oid index;
135};
136TAILQ_HEAD(mibifstack_list, mibifstack);
137
138/*
139 * NetToMediaTable (ArpTable)
140 */
141struct mibarp {
142	TAILQ_ENTRY(mibarp) link;
143	struct asn_oid	index;		/* contains both the ifindex and addr */
144	u_char		phys[128];	/* the physical address */
145	u_int		physlen;	/* and its length */
146	u_int		flags;
147};
148TAILQ_HEAD(mibarp_list, mibarp);
149enum {
150	MIBARP_FOUND	= 0x00010000,
151	MIBARP_PERM	= 0x00000001,
152};
153
154/*
155 * New if registrations
156 */
157struct newifreg {
158	TAILQ_ENTRY(newifreg) link;
159	const struct lmodule *mod;
160	int	(*func)(struct mibif *);
161};
162TAILQ_HEAD(newifreg_list, newifreg);
163
164/* list of all IP addresses */
165extern struct mibifa_list mibifa_list;
166
167/* list of all interfaces */
168extern struct mibif_list mibif_list;
169
170/* list of dynamic interface names */
171extern struct mibdynif_list mibdynif_list;
172
173/* list of all interface index mappings */
174extern struct mibindexmap_list mibindexmap_list;
175
176/* list of all stacking entries */
177extern struct mibifstack_list mibifstack_list;
178
179/* list of all receive addresses */
180extern struct mibrcvaddr_list mibrcvaddr_list;
181
182/* list of all NetToMedia entries */
183extern struct mibarp_list mibarp_list;
184
185/* number of interfaces */
186extern int32_t mib_if_number;
187
188/* last change of interface table */
189extern uint64_t mib_iftable_last_change;
190
191/* last change of stack table */
192extern uint64_t mib_ifstack_last_change;
193
194/* if this is set, one of our lists may be bad. refresh them when idle */
195extern int mib_iflist_bad;
196
197/* last time refreshed */
198extern uint64_t mibarpticks;
199
200/* info on system clocks */
201extern struct clockinfo clockinfo;
202
203/* baud rate of fastest interface */
204extern uint64_t mibif_maxspeed;
205
206/* user-forced update interval */
207extern u_int mibif_force_hc_update_interval;
208
209/* current update interval */
210extern u_int mibif_hc_update_interval;
211
212/* re-compute update interval */
213void mibif_reset_hc_timer(void);
214
215/* interfaces' data poll interval */
216extern u_int mibII_poll_ticks;
217
218/* restart the data poll timer */
219void mibif_restart_mibII_poll_timer(void);
220
221#define MIBII_POLL_TICKS	100
222
223/* get interfaces and interface addresses. */
224void mib_fetch_interfaces(void);
225
226/* check whether this interface(type) is dynamic */
227int mib_if_is_dyn(const char *name);
228
229/* destroy an interface address */
230int mib_destroy_ifa(struct mibifa *);
231
232/* restituate a deleted interface address */
233void mib_undestroy_ifa(struct mibifa *);
234
235/* change interface address */
236int mib_modify_ifa(struct mibifa *);
237
238/* undo if address modification */
239void mib_unmodify_ifa(struct mibifa *);
240
241/* create an interface address */
242struct mibifa * mib_create_ifa(u_int ifindex, struct in_addr addr, struct in_addr mask, struct in_addr bcast);
243
244/* delete a freshly created address */
245void mib_uncreate_ifa(struct mibifa *);
246
247/* create/delete arp entries */
248struct mibarp *mib_arp_create(const struct mibif *, struct in_addr, const u_char *, size_t);
249void mib_arp_delete(struct mibarp *);
250
251/* find arp entry */
252struct mibarp *mib_find_arp(const struct mibif *, struct in_addr);
253
254/* update arp table */
255void mib_arp_update(void);
256
257/* fetch routing table */
258u_char *mib_fetch_rtab(int af, int info, int arg, size_t *lenp);
259
260/* process routing message */
261void mib_sroute_process(struct rt_msghdr *, struct sockaddr *,
262    struct sockaddr *, struct sockaddr *);
263
264/* send a routing message */
265void mib_send_rtmsg(struct rt_msghdr *, struct sockaddr *,
266    struct sockaddr *, struct sockaddr *);
267
268/* extract addresses from routing message */
269void mib_extract_addrs(int, u_char *, struct sockaddr **);
270
271/* fetch routing table */
272int mib_fetch_route(void);
273