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// SPDX-License-Identifier: GPL-2.0-or-later
/* RIPd and zebra interface.
* Copyright (C) 1997, 1999 Kunihiro Ishiguro <kunihiro@zebra.org>
*/
#include <zebra.h>
#include "command.h"
#include "prefix.h"
#include "table.h"
#include "stream.h"
#include "memory.h"
#include "zclient.h"
#include "log.h"
#include "vrf.h"
#include "bfd.h"
#include "frrdistance.h"
#include "ripd/ripd.h"
#include "ripd/rip_debug.h"
#include "ripd/rip_interface.h"
/* All information about zebra. */
struct zclient *zclient = NULL;
/* Send ECMP routes to zebra. */
static void rip_zebra_ipv4_send(struct rip *rip, struct route_node *rp,
uint8_t cmd)
{
struct list *list = (struct list *)rp->info;
struct zapi_route api;
struct zapi_nexthop *api_nh;
struct listnode *listnode = NULL;
struct rip_info *rinfo = NULL;
uint32_t count = 0;
memset(&api, 0, sizeof(api));
api.vrf_id = rip->vrf->vrf_id;
api.type = ZEBRA_ROUTE_RIP;
api.safi = SAFI_UNICAST;
SET_FLAG(api.message, ZAPI_MESSAGE_NEXTHOP);
for (ALL_LIST_ELEMENTS_RO(list, listnode, rinfo)) {
if (count >= zebra_ecmp_count)
break;
api_nh = &api.nexthops[count];
api_nh->vrf_id = rip->vrf->vrf_id;
api_nh->gate = rinfo->nh.gate;
api_nh->type = NEXTHOP_TYPE_IPV4;
if (cmd == ZEBRA_ROUTE_ADD)
SET_FLAG(rinfo->flags, RIP_RTF_FIB);
else
UNSET_FLAG(rinfo->flags, RIP_RTF_FIB);
count++;
}
api.prefix = rp->p;
api.nexthop_num = count;
rinfo = listgetdata(listhead(list));
SET_FLAG(api.message, ZAPI_MESSAGE_METRIC);
api.metric = rinfo->metric;
if (rinfo->distance && rinfo->distance != ZEBRA_RIP_DISTANCE_DEFAULT) {
SET_FLAG(api.message, ZAPI_MESSAGE_DISTANCE);
api.distance = rinfo->distance;
}
if (rinfo->tag) {
SET_FLAG(api.message, ZAPI_MESSAGE_TAG);
api.tag = rinfo->tag;
}
zclient_route_send(cmd, zclient, &api);
if (IS_RIP_DEBUG_ZEBRA) {
if (rip->ecmp)
zlog_debug("%s: %pFX nexthops %d",
(cmd == ZEBRA_ROUTE_ADD)
? "Install into zebra"
: "Delete from zebra",
&rp->p, count);
else
zlog_debug("%s: %pFX",
(cmd == ZEBRA_ROUTE_ADD)
? "Install into zebra"
: "Delete from zebra", &rp->p);
}
rip->counters.route_changes++;
}
/* Add/update ECMP routes to zebra. */
void rip_zebra_ipv4_add(struct rip *rip, struct route_node *rp)
{
rip_zebra_ipv4_send(rip, rp, ZEBRA_ROUTE_ADD);
}
/* Delete ECMP routes from zebra. */
void rip_zebra_ipv4_delete(struct rip *rip, struct route_node *rp)
{
rip_zebra_ipv4_send(rip, rp, ZEBRA_ROUTE_DELETE);
}
/* Zebra route add and delete treatment. */
static int rip_zebra_read_route(ZAPI_CALLBACK_ARGS)
{
struct rip *rip;
struct zapi_route api;
struct nexthop nh;
rip = rip_lookup_by_vrf_id(vrf_id);
if (!rip)
return 0;
if (zapi_route_decode(zclient->ibuf, &api) < 0)
return -1;
memset(&nh, 0, sizeof(nh));
nh.type = api.nexthops[0].type;
nh.gate.ipv4 = api.nexthops[0].gate.ipv4;
nh.ifindex = api.nexthops[0].ifindex;
/* Then fetch IPv4 prefixes. */
if (cmd == ZEBRA_REDISTRIBUTE_ROUTE_ADD)
rip_redistribute_add(rip, api.type, RIP_ROUTE_REDISTRIBUTE,
(struct prefix_ipv4 *)&api.prefix, &nh,
api.metric, api.distance, api.tag);
else if (cmd == ZEBRA_REDISTRIBUTE_ROUTE_DEL)
rip_redistribute_delete(rip, api.type, RIP_ROUTE_REDISTRIBUTE,
(struct prefix_ipv4 *)&api.prefix,
nh.ifindex);
return 0;
}
void rip_redistribute_conf_update(struct rip *rip, int type)
{
zebra_redistribute_send(ZEBRA_REDISTRIBUTE_ADD, zclient, AFI_IP,
type, 0, rip->vrf->vrf_id);
}
void rip_redistribute_conf_delete(struct rip *rip, int type)
{
if (zclient->sock > 0)
zebra_redistribute_send(ZEBRA_REDISTRIBUTE_DELETE, zclient,
AFI_IP, type, 0, rip->vrf->vrf_id);
/* Remove the routes from RIP table. */
rip_redistribute_withdraw(rip, type);
}
int rip_redistribute_check(struct rip *rip, int type)
{
return rip->redist[type].enabled;
}
void rip_redistribute_enable(struct rip *rip)
{
for (int i = 0; i < ZEBRA_ROUTE_MAX; i++) {
if (!rip_redistribute_check(rip, i))
continue;
zebra_redistribute_send(ZEBRA_REDISTRIBUTE_ADD, zclient, AFI_IP,
i, 0, rip->vrf->vrf_id);
}
}
void rip_redistribute_disable(struct rip *rip)
{
for (int i = 0; i < ZEBRA_ROUTE_MAX; i++) {
if (!rip_redistribute_check(rip, i))
continue;
zebra_redistribute_send(ZEBRA_REDISTRIBUTE_DELETE, zclient,
AFI_IP, i, 0, rip->vrf->vrf_id);
}
}
void rip_show_redistribute_config(struct vty *vty, struct rip *rip)
{
for (int i = 0; i < ZEBRA_ROUTE_MAX; i++) {
if (i == zclient->redist_default
|| !rip_redistribute_check(rip, i))
continue;
vty_out(vty, " %s", zebra_route_string(i));
}
}
void rip_zebra_vrf_register(struct vrf *vrf)
{
if (vrf->vrf_id == VRF_DEFAULT)
return;
if (IS_RIP_DEBUG_EVENT)
zlog_debug("%s: register VRF %s(%u) to zebra", __func__,
vrf->name, vrf->vrf_id);
zclient_send_reg_requests(zclient, vrf->vrf_id);
bfd_client_sendmsg(zclient, ZEBRA_BFD_CLIENT_REGISTER, vrf->vrf_id);
}
void rip_zebra_vrf_deregister(struct vrf *vrf)
{
if (vrf->vrf_id == VRF_DEFAULT)
return;
if (IS_RIP_DEBUG_EVENT)
zlog_debug("%s: deregister VRF %s(%u) from zebra.", __func__,
vrf->name, vrf->vrf_id);
zclient_send_dereg_requests(zclient, vrf->vrf_id);
bfd_client_sendmsg(zclient, ZEBRA_BFD_CLIENT_DEREGISTER, vrf->vrf_id);
}
static void rip_zebra_connected(struct zclient *zclient)
{
zclient_send_reg_requests(zclient, VRF_DEFAULT);
bfd_client_sendmsg(zclient, ZEBRA_BFD_CLIENT_REGISTER, VRF_DEFAULT);
}
zclient_handler *const rip_handlers[] = {
[ZEBRA_INTERFACE_ADDRESS_ADD] = rip_interface_address_add,
[ZEBRA_INTERFACE_ADDRESS_DELETE] = rip_interface_address_delete,
[ZEBRA_REDISTRIBUTE_ROUTE_ADD] = rip_zebra_read_route,
[ZEBRA_REDISTRIBUTE_ROUTE_DEL] = rip_zebra_read_route,
};
static void rip_zebra_capabilities(struct zclient_capabilities *cap)
{
zebra_ecmp_count = MIN(cap->ecmp, zebra_ecmp_count);
}
void rip_zclient_init(struct event_loop *master)
{
/* Set default value to the zebra client structure. */
zclient = zclient_new(master, &zclient_options_default, rip_handlers,
array_size(rip_handlers));
zclient_init(zclient, ZEBRA_ROUTE_RIP, 0, &ripd_privs);
zclient->zebra_connected = rip_zebra_connected;
zclient->zebra_capabilities = rip_zebra_capabilities;
}
void rip_zclient_stop(void)
{
zclient_stop(zclient);
zclient_free(zclient);
}
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