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| Current File : //usr/src/contrib/bsnmp/snmp_mibII/mibII_ipaddr.c |
/*
* Copyright (c) 2001-2002
* Fraunhofer Institute for Open Communication Systems (FhG Fokus).
* All rights reserved.
*
* Author: Harti Brandt <harti@freebsd.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Begemot: bsnmp/snmp_mibII/mibII_ipaddr.c,v 1.10 2005/10/04 11:21:35 brandt_h Exp $
*
* IP address table. This table is writeable!
*
* Writing to this table will add a new IP address to the interface.
* An address can be deleted with writing the interface index 0.
*/
#include "mibII.h"
#include "mibII_oid.h"
static const struct asn_oid
oid_ipAddrTable = OIDX_ipAddrTable;
/*
* Be careful not to hold any pointers during the SET processing - the
* interface and address lists can be relocated at any time.
*/
struct update {
struct snmp_dependency dep;
uint32_t set;
struct in_addr addr;
struct in_addr mask;
int bcast;
u_int ifindex;
uint32_t rb;
struct in_addr rb_mask;
struct in_addr rb_bcast;
};
#define UPD_IFINDEX 0x0001
#define UPD_MASK 0x0002
#define UPD_BCAST 0x0004
#define RB_CREATE 0x0001
#define RB_DESTROY 0x0002
#define RB_MODIFY 0x0004
/*
* Create a new interface address
*/
static int
create(struct update *upd)
{
struct in_addr bcast;
struct mibifa *ifa;
if (!(upd->set & UPD_MASK)) {
if (IN_CLASSA(ntohl(upd->addr.s_addr)))
upd->mask.s_addr = htonl(IN_CLASSA_NET);
else if (IN_CLASSB(ntohl(upd->addr.s_addr)))
upd->mask.s_addr = htonl(IN_CLASSB_NET);
else if (IN_CLASSC(ntohl(upd->addr.s_addr)))
upd->mask.s_addr = htonl(IN_CLASSC_NET);
else
upd->mask.s_addr = 0xffffffff;
}
bcast.s_addr = upd->addr.s_addr & upd->mask.s_addr;
if (!(upd->set & UPD_BCAST) || upd->bcast) {
uint32_t tmp = ~ntohl(upd->mask.s_addr);
bcast.s_addr |= htonl(0xffffffff & ~tmp);
}
if ((ifa = mib_create_ifa(upd->ifindex, upd->addr, upd->mask, bcast))
== NULL)
return (SNMP_ERR_GENERR);
upd->rb |= RB_CREATE;
return (SNMP_ERR_NOERROR);
}
/*
* Modify the netmask or broadcast address. The ifindex cannot be
* changed (obviously).
*/
static int
modify(struct update *upd, struct mibifa *ifa)
{
struct mibif *ifp;
if ((ifp = mib_find_if(ifa->ifindex)) == NULL)
return (SNMP_ERR_WRONG_VALUE);
if ((upd->set & UPD_IFINDEX) && upd->ifindex != ifa->ifindex)
return (SNMP_ERR_INCONS_VALUE);
upd->rb_mask = ifa->inmask;
upd->rb_bcast = ifa->inbcast;
if (((upd->set & UPD_MASK) && upd->mask.s_addr != ifa->inmask.s_addr) ||
(upd->set & UPD_BCAST)) {
if (upd->set & UPD_MASK)
ifa->inmask = upd->mask;
if (upd->set & UPD_BCAST) {
ifa->inbcast.s_addr = ifa->inaddr.s_addr
& ifa->inmask.s_addr;
if (upd->bcast)
ifa->inbcast.s_addr |= 0xffffffff
& ~ifa->inmask.s_addr;
}
if (mib_modify_ifa(ifa)) {
syslog(LOG_ERR, "set netmask/bcast: %m");
ifa->inmask = upd->rb_mask;
ifa->inbcast = upd->rb_bcast;
mib_unmodify_ifa(ifa);
return (SNMP_ERR_GENERR);
}
upd->rb |= RB_MODIFY;
}
return (SNMP_ERR_NOERROR);
}
/*
* Destroy the given row in the table. We remove the address from the
* system, but keep the structure around for the COMMIT. It's deleted
* only in the FINISH operation.
*/
static int
destroy(struct snmp_context *ctx __unused, struct update *upd,
struct mibifa *ifa)
{
if (mib_destroy_ifa(ifa))
return (SNMP_ERR_GENERR);
upd->rb |= RB_DESTROY;
return (SNMP_ERR_NOERROR);
}
/*
* This function is called to commit/rollback a SET on an IpAddrEntry
*/
static int
update_func(struct snmp_context *ctx, struct snmp_dependency *dep,
enum snmp_depop op)
{
struct update *upd = (struct update *)dep;
struct mibifa *ifa;
switch (op) {
case SNMP_DEPOP_COMMIT:
if ((ifa = mib_find_ifa(upd->addr)) == NULL) {
/* non existing entry - must have ifindex */
if (!(upd->set & UPD_IFINDEX))
return (SNMP_ERR_INCONS_NAME);
return (create(upd));
}
/* existing entry */
if ((upd->set & UPD_IFINDEX) && upd->ifindex == 0) {
/* delete */
return (destroy(ctx, upd, ifa));
}
/* modify entry */
return (modify(upd, ifa));
case SNMP_DEPOP_ROLLBACK:
if ((ifa = mib_find_ifa(upd->addr)) == NULL) {
/* ups */
mib_iflist_bad = 1;
return (SNMP_ERR_NOERROR);
}
if (upd->rb & RB_CREATE) {
mib_uncreate_ifa(ifa);
return (SNMP_ERR_NOERROR);
}
if (upd->rb & RB_DESTROY) {
mib_undestroy_ifa(ifa);
return (SNMP_ERR_NOERROR);
}
if (upd->rb & RB_MODIFY) {
ifa->inmask = upd->rb_mask;
ifa->inbcast = upd->rb_bcast;
mib_unmodify_ifa(ifa);
return (SNMP_ERR_NOERROR);
}
return (SNMP_ERR_NOERROR);
case SNMP_DEPOP_FINISH:
if ((upd->rb & RB_DESTROY) &&
(ifa = mib_find_ifa(upd->addr)) != NULL &&
(ifa->flags & MIBIFA_DESTROYED)) {
TAILQ_REMOVE(&mibifa_list, ifa, link);
free(ifa);
}
return (SNMP_ERR_NOERROR);
}
abort();
}
/**********************************************************************/
/*
* ACTION
*/
int
op_ipaddr(struct snmp_context *ctx, struct snmp_value *value,
u_int sub, u_int iidx, enum snmp_op op)
{
asn_subid_t which;
struct mibifa *ifa;
struct update *upd;
struct asn_oid idx;
u_char ipaddr[4];
which = value->var.subs[sub - 1];
ifa = NULL;
switch (op) {
case SNMP_OP_GETNEXT:
if ((ifa = NEXT_OBJECT_OID(&mibifa_list, &value->var, sub)) == NULL)
return (SNMP_ERR_NOSUCHNAME);
index_append(&value->var, sub, &ifa->index);
break;
case SNMP_OP_GET:
if ((ifa = FIND_OBJECT_OID(&mibifa_list, &value->var, sub)) == NULL)
return (SNMP_ERR_NOSUCHNAME);
break;
case SNMP_OP_SET:
if (index_decode(&value->var, sub, iidx, ipaddr))
return (SNMP_ERR_NO_CREATION);
ifa = FIND_OBJECT_OID(&mibifa_list, &value->var, sub);
idx.len = 4;
idx.subs[0] = ipaddr[0];
idx.subs[1] = ipaddr[1];
idx.subs[2] = ipaddr[2];
idx.subs[3] = ipaddr[3];
if ((upd = (struct update *)snmp_dep_lookup(ctx,
&oid_ipAddrTable, &idx, sizeof(*upd), update_func)) == NULL)
return (SNMP_ERR_RES_UNAVAIL);
upd->addr.s_addr = htonl((ipaddr[0] << 24) | (ipaddr[1] << 16) |
(ipaddr[2] << 8) | (ipaddr[3] << 0));
switch (which) {
case LEAF_ipAdEntIfIndex:
if (upd->set & UPD_IFINDEX)
return (SNMP_ERR_INCONS_VALUE);
if (value->v.integer < 0 ||
value->v.integer > 0x07fffffff)
return (SNMP_ERR_WRONG_VALUE);
if (ifa != NULL) {
if (ifa->ifindex != (u_int)value->v.integer &&
value->v.integer != 0)
return (SNMP_ERR_INCONS_VALUE);
}
upd->set |= UPD_IFINDEX;
upd->ifindex = (u_int)value->v.integer;
break;
case LEAF_ipAdEntNetMask:
if (upd->set & UPD_MASK)
return (SNMP_ERR_INCONS_VALUE);
upd->mask.s_addr = htonl((value->v.ipaddress[0] << 24)
| (value->v.ipaddress[1] << 16)
| (value->v.ipaddress[2] << 8)
| (value->v.ipaddress[3] << 0));
upd->set |= UPD_MASK;
break;
case LEAF_ipAdEntBcastAddr:
if (upd->set & UPD_BCAST)
return (SNMP_ERR_INCONS_VALUE);
if (value->v.integer != 0 && value->v.integer != 1)
return (SNMP_ERR_WRONG_VALUE);
upd->bcast = value->v.integer;
upd->set |= UPD_BCAST;
break;
}
return (SNMP_ERR_NOERROR);
case SNMP_OP_ROLLBACK:
case SNMP_OP_COMMIT:
return (SNMP_ERR_NOERROR);
}
switch (which) {
case LEAF_ipAdEntAddr:
value->v.ipaddress[0] = ifa->index.subs[0];
value->v.ipaddress[1] = ifa->index.subs[1];
value->v.ipaddress[2] = ifa->index.subs[2];
value->v.ipaddress[3] = ifa->index.subs[3];
break;
case LEAF_ipAdEntIfIndex:
if (ifa->flags & MIBIFA_DESTROYED)
value->v.integer = 0;
else
value->v.integer = ifa->ifindex;
break;
case LEAF_ipAdEntNetMask:
value->v.ipaddress[0] = (ntohl(ifa->inmask.s_addr) >> 24) & 0xff;
value->v.ipaddress[1] = (ntohl(ifa->inmask.s_addr) >> 16) & 0xff;
value->v.ipaddress[2] = (ntohl(ifa->inmask.s_addr) >> 8) & 0xff;
value->v.ipaddress[3] = (ntohl(ifa->inmask.s_addr) >> 0) & 0xff;
break;
case LEAF_ipAdEntBcastAddr:
value->v.integer = ntohl(ifa->inbcast.s_addr) & 1;
break;
case LEAF_ipAdEntReasmMaxSize:
value->v.integer = 65535;
break;
}
return (SNMP_ERR_NOERROR);
}