/*
* Interface MIB architecture support
*
* $Id$
*/
#include <net-snmp/net-snmp-config.h>
#include <net-snmp/net-snmp-includes.h>
#include "mibII/mibII_common.h"
#include <net-snmp/agent/net-snmp-agent-includes.h>
#include <net-snmp/data_access/interface.h>
#include <net-snmp/data_access/route.h>
#include <net-snmp/data_access/ipaddress.h>
#include <net/if_dl.h>
#include "ip-forward-mib/data_access/route_sysctl.h"
#include "ip-forward-mib/inetCidrRouteTable/inetCidrRouteTable_constants.h"
#include "if-mib/data_access/interface_ioctl.h"
#include "route_private.h"
static int _load_ipv4(netsnmp_container*, int*);
static int _load_ipv6(netsnmp_container*, int*);
static int _create_ipv4(netsnmp_route_entry *);
static int _create_ipv6(netsnmp_route_entry *);
static int _delete_ipv4(netsnmp_route_entry *);
static int _delete_ipv6(netsnmp_route_entry *);
#if !defined(SA_SIZE) && !defined(RT_ROUNDUP)
#define RT_ROUNDUP(a) \
((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))
#endif
#ifndef SA_SIZE
#define SA_SIZE(x) RT_ROUNDUP(((struct sockaddr *)(x))->sa_len)
#endif
/** arch specific load
* @internal
*
* @retval 0 success
* @retval -1 no container specified
* @retval -2 could not access data source
*/
int
netsnmp_access_route_container_arch_load(netsnmp_container* container,
u_int load_flags)
{
int count, err;
err = 0;
DEBUGMSGTL(("access:route:container", "route_container_arch_load\n"));
if (container == NULL) {
snmp_log(LOG_ERR, "no container specified/found for access_route\n");
return -1;
}
err = _load_ipv4(container, &count);
if (err != 0) {
NETSNMP_LOGONCE((LOG_ERR, "_load_ipv4 failed %d\n", err));
goto out;
}
if (err != 0 || load_flags & NETSNMP_ACCESS_ROUTE_LOAD_IPV4_ONLY)
return err;
err = _load_ipv6(container, &count);
if (err != 0) {
NETSNMP_LOGONCE((LOG_ERR, "_load_ipv6 failed %d\n", err));
goto out;
}
out:
return (err == 0 ? 0 : -3);
}
/** arch specific new route entry creation
* @internal
*
* @retval 0 success
* @retval -1 invalid entry specified
* @retval -2 could not create route entry
*/
int
netsnmp_arch_route_create(netsnmp_route_entry *entry)
{
int err;
if (NULL == entry)
return -1;
switch (entry->rt_dest_type) {
case INETADDRESSTYPE_IPV4:
err = _create_ipv4(entry);
break;
#ifdef NETSNMP_ENABLE_IPV6
case INETADDRESSTYPE_IPV6:
err = _create_ipv6(entry);
break;
#endif
default:
err = 0;
}
return (err == 0 ? 0 : -2);
}
/** arch specific new route entry deletion
* @internal
*
* @retval 0 success
* @retval -1 invalid entry specified
* @retval -2 could not delete route entry
*/
int
netsnmp_arch_route_delete(netsnmp_route_entry *entry)
{
int err;
DEBUGMSGTL(("access:route:container",
"route_container_arch_delete\n"));
if (NULL == entry)
return -1;
switch (entry->rt_dest_type) {
case INETADDRESSTYPE_IPV4:
err = _delete_ipv4(entry);
break;
#ifdef NETSNMP_ENABLE_IPV6
case INETADDRESSTYPE_IPV6:
err = _delete_ipv6(entry);
break;
#endif
default:
err = 0;
}
return (err == 0 ? 0 : -2);
}
#if defined(freebsd4) || defined(netbsd4) || defined(openbsd) || defined(darwin)
static int
_type_from_flags(int flags)
{
if (flags & RTF_UP) {
if (flags & RTF_BLACKHOLE)
return INETCIDRROUTETYPE_REJECT;
#ifdef RTF_LOCAL
else if (flags & RTF_LOCAL)
return INETCIDRROUTETYPE_LOCAL;
#endif
else if (flags & RTF_GATEWAY)
return INETCIDRROUTETYPE_REMOTE;
else
return INETCIDRROUTETYPE_OTHER;
}
return 0;
}
static int
_load_routing_table_from_sysctl(netsnmp_container* container, int *index,
int family)
{
char *buf, *lim, *next;
int mib[6];
size_t needed;
int err;
u_char dest_len, dest_type;
struct rt_msghdr *rtm;
buf = NULL;
err = 0;
if (family == AF_INET) {
dest_len = 4;
dest_type = INETADDRESSTYPE_IPV4;
} else if (family == AF_INET6) {
dest_len = 16;
dest_type = INETADDRESSTYPE_IPV6;
} else {
err = EINVAL;
goto out;
}
mib[0] = CTL_NET;
mib[1] = PF_ROUTE;
mib[2] = 0;
mib[3] = family;
mib[4] = NET_RT_DUMP;
mib[5] = 0;
if (sysctl(mib, (sizeof(mib) / sizeof(mib[0])), NULL, &needed, NULL,
0) == -1) {
err = errno;
goto out;
}
if ((buf = malloc(needed)) == NULL) {
err = ENOMEM;
goto out;
}
if (sysctl(mib, (sizeof(mib) / sizeof(mib[0])), buf, &needed, NULL,
0) == -1) {
err = errno;
goto out;
}
lim = buf + needed;
for (next = buf; next < lim; next += rtm->rtm_msglen) {
struct sockaddr *if_name = NULL, *if_addr = NULL;
struct sockaddr *dest_sa = NULL, *gateway_sa = NULL, *netmask_sa = NULL;
netsnmp_route_entry *entry;
char *addr_ptr;
rtm = (struct rt_msghdr*)next;
/*
* Some code in netstat checks for this ("netmasks done" case).
* Filter this out (I don't know why it should exist).
*/
if (rtm->rtm_addrs == RTA_DST)
continue;
#ifdef RTF_CLONED
if (rtm->rtm_flags & RTF_CLONED)
continue;
#endif
#ifdef RTF_WASCLONED
if (rtm->rtm_flags & RTF_WASCLONED)
continue;
#endif
entry = netsnmp_access_route_entry_create();
if (entry == NULL)
return -3;
memset(entry->rt_dest, 0, dest_len);
entry->rt_mask = 0;
memset(entry->rt_nexthop, 0, dest_len);
addr_ptr = (char *)(rtm + 1);
if (rtm->rtm_addrs & RTA_DST) {
dest_sa = (struct sockaddr *)addr_ptr;
addr_ptr += SA_SIZE(dest_sa);
}
if (rtm->rtm_addrs & RTA_GATEWAY) {
gateway_sa = (struct sockaddr *)addr_ptr;
addr_ptr += SA_SIZE(gateway_sa);
}
if (rtm->rtm_addrs & RTA_NETMASK) {
netmask_sa = (struct sockaddr *)addr_ptr;
addr_ptr += SA_SIZE(netmask_sa);
}
if (rtm->rtm_addrs & RTA_IFP) {
if_name = (struct sockaddr *)addr_ptr;
addr_ptr += SA_SIZE(if_name);
}
if (rtm->rtm_addrs & RTA_IFA) {
if_addr = (struct sockaddr *)addr_ptr;
addr_ptr += SA_SIZE(if_addr);
}
entry->if_index = rtm->rtm_index;
/* arbitrary index */
entry->ns_rt_index = ++(*index);
/* copy dest & next hop */
entry->rt_dest_type = dest_type;
entry->rt_dest_len = dest_len;
if (rtm->rtm_addrs & RTA_DST) {
if (family == AF_INET)
memcpy(entry->rt_dest,
&((struct sockaddr_in*)dest_sa)->sin_addr, dest_len);
#ifdef NETSNMP_ENABLE_IPV6
if (family == AF_INET6)
memcpy(entry->rt_dest,
&((struct sockaddr_in6*)dest_sa)->sin6_addr, dest_len);
#endif
}
entry->rt_nexthop_type = dest_type;
entry->rt_nexthop_len = dest_len;
if (rtm->rtm_addrs & RTA_GATEWAY) {
if (family == AF_INET)
memcpy(entry->rt_nexthop,
&((struct sockaddr_in*)gateway_sa)->sin_addr, dest_len);
#ifdef NETSNMP_ENABLE_IPV6
if (family == AF_INET6)
memcpy(entry->rt_nexthop,
&((struct sockaddr_in6*)gateway_sa)->sin6_addr, dest_len);
#endif
}
else {
if (family == AF_INET)
memcpy(entry->rt_nexthop,
&((struct sockaddr_in*)if_addr)->sin_addr, dest_len);
#ifdef NETSNMP_ENABLE_IPV6
if (family == AF_INET6)
memcpy(entry->rt_nexthop,
&((struct sockaddr_in6*)if_addr)->sin6_addr, dest_len);
#endif
}
if (family == AF_INET) {
if (netmask_sa) {
/* count bits in mask */
entry->rt_pfx_len = netsnmp_ipaddress_ipv4_prefix_len(
((struct sockaddr_in *)netmask_sa)->sin_addr.s_addr);
memcpy(&entry->rt_mask, &((struct sockaddr_in *)netmask_sa)->sin_addr, 4);
}
else {
entry->rt_pfx_len = 32;
}
}
#ifdef NETSNMP_ENABLE_IPV6
if (family == AF_INET6) {
if (netmask_sa) {
/* count bits in mask */
entry->rt_pfx_len = netsnmp_ipaddress_ipv6_prefix_len(
((struct sockaddr_in6 *)netmask_sa)->sin6_addr);
memcpy(&entry->rt_mask, &((struct sockaddr_in6 *)netmask_sa)->sin6_addr, 16);
}
else {
entry->rt_pfx_len = 128;
}
}
#endif
#ifdef USING_IP_FORWARD_MIB_INETCIDRROUTETABLE_INETCIDRROUTETABLE_MODULE
/*
inetCidrRoutePolicy OBJECT-TYPE
SYNTAX OBJECT IDENTIFIER
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"This object is an opaque object without any defined
semantics. Its purpose is to serve as an additional
index which may delineate between multiple entries to
the same destination. The value { 0 0 } shall be used
as the default value for this object."
*/
entry->rt_policy = calloc(3, sizeof(oid));
entry->rt_policy[2] = entry->if_index;
entry->rt_policy_len = sizeof(oid)*3;
#endif
entry->rt_type = _type_from_flags(rtm->rtm_flags);
entry->rt_age = rtm->rtm_rmx.rmx_expire;
entry->rt_nexthop_as = 0;
/* entry->rt_metric1 = rtm->rtm_rmx.rmx_hopcount; */
if (rtm->rtm_flags & RTF_DYNAMIC)
entry->rt_proto = IANAIPROUTEPROTOCOL_ICMP;
else if (rtm->rtm_flags & RTF_STATIC)
entry->rt_proto = IANAIPROUTEPROTOCOL_NETMGMT;
#ifdef RTF_LOCAL
else if (rtm->rtm_flags & RTF_LOCAL)
entry->rt_proto = IANAIPROUTEPROTOCOL_LOCAL;
#endif
else
entry->rt_proto = IANAIPROUTEPROTOCOL_OTHER;
if (CONTAINER_INSERT(container, entry) < 0) {
DEBUGMSGTL(("access:route:container",
"error with route_entry: insert into container failed.\n"));
netsnmp_access_route_entry_free(entry);
continue;
}
}
out:
free(buf);
return err;
}
/**
* netsnmp_access_route_container_arch_load* functions.
*/
static int
_load_ipv4(netsnmp_container* container, int *index)
{
DEBUGMSGTL(("access:route:container",
"route_container_arch_load ipv4\n"));
return _load_routing_table_from_sysctl(container, index, AF_INET);
}
static int
_load_ipv6(netsnmp_container* container, int *index)
{
#ifdef NETSNMP_ENABLE_IPV6
DEBUGMSGTL(("access:route:container",
"route_container_arch_load ipv6\n"));
return _load_routing_table_from_sysctl(container, index, AF_INET6);
#else
return 0;
#endif
}
/**
* netsnmp_access_route_create* functions.
*
* TODO: add logic similar to newroute(..) in sbin/route/route.c .
*/
static int
_create_ipv4(netsnmp_route_entry *entry)
{
return 0;
}
static int
_create_ipv6(netsnmp_route_entry *entry)
{
return 0;
}
/**
* netsnmp_access_route_delete* functions.
*
* TODO: add logic similar to newroute(..) in sbin/route/route.c .
*/
static int
_delete_ipv4(netsnmp_route_entry *entry)
{
return 0;
}
static int
_delete_ipv6(netsnmp_route_entry *entry)
{
#ifdef NETSNMP_ENABLE_IPV6
#endif
return 0;
}
#endif /* defined(freebsd7) || defined(netbsd) || defined(openbsd) */