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mirror_frr/zebra/zebra_snmp.c
David Lamparter 09781197b6 build: make builddir include path consistent 
... by referencing all autogenerated headers relative to the root
directory.  (90% of the changes here is `version.h`.)

Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
2021-04-21 15:42:33 +02:00

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/* FIB SNMP.
* Copyright (C) 1999 Kunihiro Ishiguro
*
* This file is part of GNU Zebra.
*
* GNU Zebra is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2, or (at your option) any
* later version.
*
* GNU Zebra is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; see the file COPYING; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
/*
* Currently SNMP is only running properly for MIBs in the default VRF.
*/
#include <zebra.h>
#include <net-snmp/net-snmp-config.h>
#include <net-snmp/net-snmp-includes.h>
#include "if.h"
#include "log.h"
#include "prefix.h"
#include "command.h"
#include "smux.h"
#include "table.h"
#include "vrf.h"
#include "hook.h"
#include "libfrr.h"
#include "lib/version.h"
#include "zebra/rib.h"
#include "zebra/zserv.h"
#include "zebra/zebra_vrf.h"
#define IPFWMIB 1,3,6,1,2,1,4,24
/* ipForwardTable */
#define IPFORWARDDEST 1
#define IPFORWARDMASK 2
#define IPFORWARDPOLICY 3
#define IPFORWARDNEXTHOP 4
#define IPFORWARDIFINDEX 5
#define IPFORWARDTYPE 6
#define IPFORWARDPROTO 7
#define IPFORWARDAGE 8
#define IPFORWARDINFO 9
#define IPFORWARDNEXTHOPAS 10
#define IPFORWARDMETRIC1 11
#define IPFORWARDMETRIC2 12
#define IPFORWARDMETRIC3 13
#define IPFORWARDMETRIC4 14
#define IPFORWARDMETRIC5 15
/* ipCidrRouteTable */
#define IPCIDRROUTEDEST 1
#define IPCIDRROUTEMASK 2
#define IPCIDRROUTETOS 3
#define IPCIDRROUTENEXTHOP 4
#define IPCIDRROUTEIFINDEX 5
#define IPCIDRROUTETYPE 6
#define IPCIDRROUTEPROTO 7
#define IPCIDRROUTEAGE 8
#define IPCIDRROUTEINFO 9
#define IPCIDRROUTENEXTHOPAS 10
#define IPCIDRROUTEMETRIC1 11
#define IPCIDRROUTEMETRIC2 12
#define IPCIDRROUTEMETRIC3 13
#define IPCIDRROUTEMETRIC4 14
#define IPCIDRROUTEMETRIC5 15
#define IPCIDRROUTESTATUS 16
#define INTEGER32 ASN_INTEGER
#define GAUGE32 ASN_GAUGE
#define ENUMERATION ASN_INTEGER
#define ROWSTATUS ASN_INTEGER
#define IPADDRESS ASN_IPADDRESS
#define OBJECTIDENTIFIER ASN_OBJECT_ID
static oid ipfw_oid[] = {IPFWMIB};
/* Hook functions. */
static uint8_t *ipFwNumber(struct variable *, oid[], size_t *, int, size_t *,
WriteMethod **);
static uint8_t *ipFwTable(struct variable *, oid[], size_t *, int, size_t *,
WriteMethod **);
static uint8_t *ipCidrNumber(struct variable *, oid[], size_t *, int, size_t *,
WriteMethod **);
static uint8_t *ipCidrTable(struct variable *, oid[], size_t *, int, size_t *,
WriteMethod **);
static struct variable zebra_variables[] = {
{0, GAUGE32, RONLY, ipFwNumber, 1, {1}},
{IPFORWARDDEST, IPADDRESS, RONLY, ipFwTable, 3, {2, 1, 1}},
{IPFORWARDMASK, IPADDRESS, RONLY, ipFwTable, 3, {2, 1, 2}},
{IPFORWARDPOLICY, INTEGER32, RONLY, ipFwTable, 3, {2, 1, 3}},
{IPFORWARDNEXTHOP, IPADDRESS, RONLY, ipFwTable, 3, {2, 1, 4}},
{IPFORWARDIFINDEX, INTEGER32, RONLY, ipFwTable, 3, {2, 1, 5}},
{IPFORWARDTYPE, ENUMERATION, RONLY, ipFwTable, 3, {2, 1, 6}},
{IPFORWARDPROTO, ENUMERATION, RONLY, ipFwTable, 3, {2, 1, 7}},
{IPFORWARDAGE, INTEGER32, RONLY, ipFwTable, 3, {2, 1, 8}},
{IPFORWARDINFO, OBJECTIDENTIFIER, RONLY, ipFwTable, 3, {2, 1, 9}},
{IPFORWARDNEXTHOPAS, INTEGER32, RONLY, ipFwTable, 3, {2, 1, 10}},
{IPFORWARDMETRIC1, INTEGER32, RONLY, ipFwTable, 3, {2, 1, 11}},
{IPFORWARDMETRIC2, INTEGER32, RONLY, ipFwTable, 3, {2, 1, 12}},
{IPFORWARDMETRIC3, INTEGER32, RONLY, ipFwTable, 3, {2, 1, 13}},
{IPFORWARDMETRIC4, INTEGER32, RONLY, ipFwTable, 3, {2, 1, 14}},
{IPFORWARDMETRIC5, INTEGER32, RONLY, ipFwTable, 3, {2, 1, 15}},
{0, GAUGE32, RONLY, ipCidrNumber, 1, {3}},
{IPCIDRROUTEDEST, IPADDRESS, RONLY, ipCidrTable, 3, {4, 1, 1}},
{IPCIDRROUTEMASK, IPADDRESS, RONLY, ipCidrTable, 3, {4, 1, 2}},
{IPCIDRROUTETOS, INTEGER32, RONLY, ipCidrTable, 3, {4, 1, 3}},
{IPCIDRROUTENEXTHOP, IPADDRESS, RONLY, ipCidrTable, 3, {4, 1, 4}},
{IPCIDRROUTEIFINDEX, INTEGER32, RONLY, ipCidrTable, 3, {4, 1, 5}},
{IPCIDRROUTETYPE, ENUMERATION, RONLY, ipCidrTable, 3, {4, 1, 6}},
{IPCIDRROUTEPROTO, ENUMERATION, RONLY, ipCidrTable, 3, {4, 1, 7}},
{IPCIDRROUTEAGE, INTEGER32, RONLY, ipCidrTable, 3, {4, 1, 8}},
{IPCIDRROUTEINFO, OBJECTIDENTIFIER, RONLY, ipCidrTable, 3, {4, 1, 9}},
{IPCIDRROUTENEXTHOPAS, INTEGER32, RONLY, ipCidrTable, 3, {4, 1, 10}},
{IPCIDRROUTEMETRIC1, INTEGER32, RONLY, ipCidrTable, 3, {4, 1, 11}},
{IPCIDRROUTEMETRIC2, INTEGER32, RONLY, ipCidrTable, 3, {4, 1, 12}},
{IPCIDRROUTEMETRIC3, INTEGER32, RONLY, ipCidrTable, 3, {4, 1, 13}},
{IPCIDRROUTEMETRIC4, INTEGER32, RONLY, ipCidrTable, 3, {4, 1, 14}},
{IPCIDRROUTEMETRIC5, INTEGER32, RONLY, ipCidrTable, 3, {4, 1, 15}},
{IPCIDRROUTESTATUS, ROWSTATUS, RONLY, ipCidrTable, 3, {4, 1, 16}}};
static uint8_t *ipFwNumber(struct variable *v, oid objid[], size_t *objid_len,
int exact, size_t *val_len,
WriteMethod **write_method)
{
static int result;
struct route_table *table;
struct route_node *rn;
struct route_entry *re;
if (smux_header_generic(v, objid, objid_len, exact, val_len,
write_method)
== MATCH_FAILED)
return NULL;
table = zebra_vrf_table(AFI_IP, SAFI_UNICAST, VRF_DEFAULT);
if (!table)
return NULL;
/* Return number of routing entries. */
result = 0;
for (rn = route_top(table); rn; rn = route_next(rn))
RNODE_FOREACH_RE (rn, re) {
result++;
}
return (uint8_t *)&result;
}
static uint8_t *ipCidrNumber(struct variable *v, oid objid[], size_t *objid_len,
int exact, size_t *val_len,
WriteMethod **write_method)
{
static int result;
struct route_table *table;
struct route_node *rn;
struct route_entry *re;
if (smux_header_generic(v, objid, objid_len, exact, val_len,
write_method)
== MATCH_FAILED)
return NULL;
table = zebra_vrf_table(AFI_IP, SAFI_UNICAST, VRF_DEFAULT);
if (!table)
return 0;
/* Return number of routing entries. */
result = 0;
for (rn = route_top(table); rn; rn = route_next(rn))
RNODE_FOREACH_RE (rn, re) {
result++;
}
return (uint8_t *)&result;
}
static int in_addr_cmp(uint8_t *p1, uint8_t *p2)
{
int i;
for (i = 0; i < 4; i++) {
if (*p1 < *p2)
return -1;
if (*p1 > *p2)
return 1;
p1++;
p2++;
}
return 0;
}
static int in_addr_add(uint8_t *p, int num)
{
int i, ip0;
ip0 = *p;
p += 4;
for (i = 3; 0 <= i; i--) {
p--;
if (*p + num > 255) {
*p += num;
num = 1;
} else {
*p += num;
return 1;
}
}
if (ip0 > *p) {
/* ip + num > 0xffffffff */
return 0;
}
return 1;
}
static int proto_trans(int type)
{
switch (type) {
case ZEBRA_ROUTE_SYSTEM:
return 1; /* other */
case ZEBRA_ROUTE_KERNEL:
return 1; /* other */
case ZEBRA_ROUTE_CONNECT:
return 2; /* local interface */
case ZEBRA_ROUTE_STATIC:
return 3; /* static route */
case ZEBRA_ROUTE_RIP:
return 8; /* rip */
case ZEBRA_ROUTE_RIPNG:
return 1; /* shouldn't happen */
case ZEBRA_ROUTE_OSPF:
return 13; /* ospf */
case ZEBRA_ROUTE_OSPF6:
return 1; /* shouldn't happen */
case ZEBRA_ROUTE_BGP:
return 14; /* bgp */
default:
return 1; /* other */
}
}
static void check_replace(struct route_node *np2, struct route_entry *re2,
struct route_node **np, struct route_entry **re)
{
int proto, proto2;
if (!*np) {
*np = np2;
*re = re2;
return;
}
if (prefix_cmp(&(*np)->p, &np2->p) < 0)
return;
if (prefix_cmp(&(*np)->p, &np2->p) > 0) {
*np = np2;
*re = re2;
return;
}
proto = proto_trans((*re)->type);
proto2 = proto_trans(re2->type);
if (proto2 > proto)
return;
if (proto2 < proto) {
*np = np2;
*re = re2;
return;
}
if (in_addr_cmp((uint8_t *)&(*re)->nhe->nhg.nexthop->gate.ipv4,
(uint8_t *)&re2->nhe->nhg.nexthop->gate.ipv4)
<= 0)
return;
*np = np2;
*re = re2;
return;
}
static void get_fwtable_route_node(struct variable *v, oid objid[],
size_t *objid_len, int exact,
struct route_node **np,
struct route_entry **re)
{
struct in_addr dest;
struct route_table *table;
struct route_node *np2;
struct route_entry *re2;
int proto;
int policy;
struct in_addr nexthop;
uint8_t *pnt;
int i;
/* Init index variables */
pnt = (uint8_t *)&dest;
for (i = 0; i < 4; i++)
*pnt++ = 0;
pnt = (uint8_t *)&nexthop;
for (i = 0; i < 4; i++)
*pnt++ = 0;
proto = 0;
policy = 0;
/* Init return variables */
*np = NULL;
*re = NULL;
/* Short circuit exact matches of wrong length */
if (exact && (*objid_len != (unsigned)v->namelen + 10))
return;
table = zebra_vrf_table(AFI_IP, SAFI_UNICAST, VRF_DEFAULT);
if (!table)
return;
/* Get INDEX information out of OID.
* ipForwardDest, ipForwardProto, ipForwardPolicy, ipForwardNextHop
*/
if (*objid_len > (unsigned)v->namelen)
oid2in_addr(objid + v->namelen,
MIN(4U, *objid_len - v->namelen), &dest);
if (*objid_len > (unsigned)v->namelen + 4)
proto = objid[v->namelen + 4];
if (*objid_len > (unsigned)v->namelen + 5)
policy = objid[v->namelen + 5];
if (*objid_len > (unsigned)v->namelen + 6)
oid2in_addr(objid + v->namelen + 6,
MIN(4U, *objid_len - v->namelen - 6), &nexthop);
/* Apply GETNEXT on not exact search */
if (!exact && (*objid_len >= (unsigned)v->namelen + 10)) {
if (!in_addr_add((uint8_t *)&nexthop, 1))
return;
}
/* For exact: search matching entry in rib table. */
if (exact) {
if (policy) /* Not supported (yet?) */
return;
for (*np = route_top(table); *np; *np = route_next(*np)) {
if (!in_addr_cmp(&(*np)->p.u.prefix,
(uint8_t *)&dest)) {
RNODE_FOREACH_RE (*np, *re) {
if (!in_addr_cmp((uint8_t *)&(*re)->nhe
->nhg.nexthop
->gate.ipv4,
(uint8_t *)&nexthop))
if (proto
== proto_trans((*re)->type))
return;
}
}
}
return;
}
/* Search next best entry */
for (np2 = route_top(table); np2; np2 = route_next(np2)) {
/* Check destination first */
if (in_addr_cmp(&np2->p.u.prefix, (uint8_t *)&dest) > 0)
RNODE_FOREACH_RE (np2, re2) {
check_replace(np2, re2, np, re);
}
if (in_addr_cmp(&np2->p.u.prefix, (uint8_t *)&dest)
== 0) { /* have to look at each re individually */
RNODE_FOREACH_RE (np2, re2) {
int proto2, policy2;
proto2 = proto_trans(re2->type);
policy2 = 0;
if ((policy < policy2)
|| ((policy == policy2) && (proto < proto2))
|| ((policy == policy2) && (proto == proto2)
&& (in_addr_cmp(
(uint8_t *)&re2->nhe
->nhg.nexthop->gate.ipv4,
(uint8_t *)&nexthop)
>= 0)))
check_replace(np2, re2, np, re);
}
}
}
if (!*re)
return;
policy = 0;
proto = proto_trans((*re)->type);
*objid_len = v->namelen + 10;
pnt = (uint8_t *)&(*np)->p.u.prefix;
for (i = 0; i < 4; i++)
objid[v->namelen + i] = *pnt++;
objid[v->namelen + 4] = proto;
objid[v->namelen + 5] = policy;
{
struct nexthop *nexthop;
nexthop = (*re)->nhe->nhg.nexthop;
if (nexthop) {
pnt = (uint8_t *)&nexthop->gate.ipv4;
for (i = 0; i < 4; i++)
objid[i + v->namelen + 6] = *pnt++;
}
}
return;
}
static uint8_t *ipFwTable(struct variable *v, oid objid[], size_t *objid_len,
int exact, size_t *val_len,
WriteMethod **write_method)
{
struct route_node *np;
struct route_entry *re;
static int result;
static int resarr[2];
static struct in_addr netmask;
struct nexthop *nexthop;
if (smux_header_table(v, objid, objid_len, exact, val_len, write_method)
== MATCH_FAILED)
return NULL;
get_fwtable_route_node(v, objid, objid_len, exact, &np, &re);
if (!np)
return NULL;
nexthop = re->nhe->nhg.nexthop;
if (!nexthop)
return NULL;
switch (v->magic) {
case IPFORWARDDEST:
*val_len = 4;
return &np->p.u.prefix;
case IPFORWARDMASK:
masklen2ip(np->p.prefixlen, &netmask);
*val_len = 4;
return (uint8_t *)&netmask;
case IPFORWARDPOLICY:
result = 0;
*val_len = sizeof(int);
return (uint8_t *)&result;
case IPFORWARDNEXTHOP:
*val_len = 4;
return (uint8_t *)&nexthop->gate.ipv4;
case IPFORWARDIFINDEX:
*val_len = sizeof(int);
return (uint8_t *)&nexthop->ifindex;
case IPFORWARDTYPE:
if (nexthop->type == NEXTHOP_TYPE_IFINDEX)
result = 3;
else
result = 4;
*val_len = sizeof(int);
return (uint8_t *)&result;
case IPFORWARDPROTO:
result = proto_trans(re->type);
*val_len = sizeof(int);
return (uint8_t *)&result;
case IPFORWARDAGE:
result = 0;
*val_len = sizeof(int);
return (uint8_t *)&result;
case IPFORWARDINFO:
resarr[0] = 0;
resarr[1] = 0;
*val_len = 2 * sizeof(int);
return (uint8_t *)resarr;
case IPFORWARDNEXTHOPAS:
result = -1;
*val_len = sizeof(int);
return (uint8_t *)&result;
case IPFORWARDMETRIC1:
result = 0;
*val_len = sizeof(int);
return (uint8_t *)&result;
case IPFORWARDMETRIC2:
result = 0;
*val_len = sizeof(int);
return (uint8_t *)&result;
case IPFORWARDMETRIC3:
result = 0;
*val_len = sizeof(int);
return (uint8_t *)&result;
case IPFORWARDMETRIC4:
result = 0;
*val_len = sizeof(int);
return (uint8_t *)&result;
case IPFORWARDMETRIC5:
result = 0;
*val_len = sizeof(int);
return (uint8_t *)&result;
default:
return NULL;
}
return NULL;
}
static uint8_t *ipCidrTable(struct variable *v, oid objid[], size_t *objid_len,
int exact, size_t *val_len,
WriteMethod **write_method)
{
if (smux_header_table(v, objid, objid_len, exact, val_len, write_method)
== MATCH_FAILED)
return NULL;
switch (v->magic) {
case IPCIDRROUTEDEST:
break;
default:
return NULL;
}
return NULL;
}
static int zebra_snmp_init(struct thread_master *tm)
{
smux_init(tm);
REGISTER_MIB("mibII/ipforward", zebra_variables, variable, ipfw_oid);
return 0;
}
static int zebra_snmp_module_init(void)
{
hook_register(frr_late_init, zebra_snmp_init);
return 0;
}
FRR_MODULE_SETUP(.name = "zebra_snmp", .version = FRR_VERSION,
.description = "zebra AgentX SNMP module",
.init = zebra_snmp_module_init,
);
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