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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* RIPngd and zebra interface.
* Copyright (C) 1998, 1999 Kunihiro Ishiguro
*/
#include <zebra.h>
#include "command.h"
#include "prefix.h"
#include "agg_table.h"
#include "stream.h"
#include "memory.h"
#include "routemap.h"
#include "zclient.h"
#include "log.h"
#include "ripngd/ripngd.h"
#include "ripngd/ripng_debug.h"
/* All information about zebra. */
struct zclient *zclient = NULL;
uint32_t zebra_ecmp_count = MULTIPATH_NUM;
/* Send ECMP routes to zebra. */
static void ripng_zebra_ipv6_send(struct ripng *ripng, struct agg_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 ripng_info *rinfo = NULL;
uint32_t count = 0;
const struct prefix *p = agg_node_get_prefix(rp);
memset(&api, 0, sizeof(api));
api.vrf_id = ripng->vrf->vrf_id;
api.type = ZEBRA_ROUTE_RIPNG;
api.safi = SAFI_UNICAST;
api.prefix = *p;
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 = ripng->vrf->vrf_id;
api_nh->gate.ipv6 = rinfo->nexthop;
api_nh->ifindex = rinfo->ifindex;
api_nh->type = NEXTHOP_TYPE_IPV6_IFINDEX;
count++;
if (cmd == ZEBRA_ROUTE_ADD)
SET_FLAG(rinfo->flags, RIPNG_RTF_FIB);
else
UNSET_FLAG(rinfo->flags, RIPNG_RTF_FIB);
}
api.nexthop_num = count;
rinfo = listgetdata(listhead(list));
SET_FLAG(api.message, ZAPI_MESSAGE_METRIC);
api.metric = rinfo->metric;
if (rinfo->tag) {
SET_FLAG(api.message, ZAPI_MESSAGE_TAG);
api.tag = rinfo->tag;
}
zclient_route_send(cmd, zclient, &api);
if (IS_RIPNG_DEBUG_ZEBRA) {
if (ripng->ecmp)
zlog_debug("%s: %pRN nexthops %d",
(cmd == ZEBRA_ROUTE_ADD)
? "Install into zebra"
: "Delete from zebra",
rp, count);
else
zlog_debug("%s: %pRN",
(cmd == ZEBRA_ROUTE_ADD)
? "Install into zebra"
: "Delete from zebra",
rp);
}
}
/* Add/update ECMP routes to zebra. */
void ripng_zebra_ipv6_add(struct ripng *ripng, struct agg_node *rp)
{
ripng_zebra_ipv6_send(ripng, rp, ZEBRA_ROUTE_ADD);
}
/* Delete ECMP routes from zebra. */
void ripng_zebra_ipv6_delete(struct ripng *ripng, struct agg_node *rp)
{
ripng_zebra_ipv6_send(ripng, rp, ZEBRA_ROUTE_DELETE);
}
/* Zebra route add and delete treatment. */
static int ripng_zebra_read_route(ZAPI_CALLBACK_ARGS)
{
struct ripng *ripng;
struct zapi_route api;
struct in6_addr nexthop;
unsigned long ifindex;
ripng = ripng_lookup_by_vrf_id(vrf_id);
if (!ripng)
return 0;
if (zapi_route_decode(zclient->ibuf, &api) < 0)
return -1;
/* we completely ignore srcdest routes for now. */
if (CHECK_FLAG(api.message, ZAPI_MESSAGE_SRCPFX))
return 0;
if (IN6_IS_ADDR_LINKLOCAL(&api.prefix.u.prefix6))
return 0;
nexthop = api.nexthops[0].gate.ipv6;
ifindex = api.nexthops[0].ifindex;
if (cmd == ZEBRA_REDISTRIBUTE_ROUTE_ADD)
ripng_redistribute_add(ripng, api.type,
RIPNG_ROUTE_REDISTRIBUTE,
(struct prefix_ipv6 *)&api.prefix,
ifindex, &nexthop, api.tag);
else
ripng_redistribute_delete(
ripng, api.type, RIPNG_ROUTE_REDISTRIBUTE,
(struct prefix_ipv6 *)&api.prefix, ifindex);
return 0;
}
void ripng_redistribute_conf_update(struct ripng *ripng, int type)
{
zebra_redistribute_send(ZEBRA_REDISTRIBUTE_ADD, zclient, AFI_IP6,
type, 0, ripng->vrf->vrf_id);
}
void ripng_redistribute_conf_delete(struct ripng *ripng, int type)
{
if (zclient->sock > 0)
zebra_redistribute_send(ZEBRA_REDISTRIBUTE_DELETE, zclient,
AFI_IP6, type, 0, ripng->vrf->vrf_id);
ripng_redistribute_withdraw(ripng, type);
}
int ripng_redistribute_check(struct ripng *ripng, int type)
{
return ripng->redist[type].enabled;
}
void ripng_redistribute_enable(struct ripng *ripng)
{
for (int i = 0; i < ZEBRA_ROUTE_MAX; i++) {
if (!ripng_redistribute_check(ripng, i))
continue;
zebra_redistribute_send(ZEBRA_REDISTRIBUTE_ADD, zclient,
AFI_IP6, i, 0, ripng->vrf->vrf_id);
}
}
void ripng_redistribute_disable(struct ripng *ripng)
{
for (int i = 0; i < ZEBRA_ROUTE_MAX; i++) {
if (!ripng_redistribute_check(ripng, i))
continue;
zebra_redistribute_send(ZEBRA_REDISTRIBUTE_DELETE, zclient,
AFI_IP6, i, 0, ripng->vrf->vrf_id);
}
}
void ripng_redistribute_write(struct vty *vty, struct ripng *ripng)
{
int i;
for (i = 0; i < ZEBRA_ROUTE_MAX; i++) {
if (i == zclient->redist_default
|| !ripng_redistribute_check(ripng, i))
continue;
vty_out(vty, " %s", zebra_route_string(i));
}
}
void ripng_zebra_vrf_register(struct vrf *vrf)
{
if (vrf->vrf_id == VRF_DEFAULT)
return;
if (IS_RIPNG_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);
}
void ripng_zebra_vrf_deregister(struct vrf *vrf)
{
if (vrf->vrf_id == VRF_DEFAULT)
return;
if (IS_RIPNG_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);
}
static void ripng_zebra_connected(struct zclient *zclient)
{
zclient_send_reg_requests(zclient, VRF_DEFAULT);
}
static zclient_handler *const ripng_handlers[] = {
[ZEBRA_INTERFACE_ADDRESS_ADD] = ripng_interface_address_add,
[ZEBRA_INTERFACE_ADDRESS_DELETE] = ripng_interface_address_delete,
[ZEBRA_INTERFACE_VRF_UPDATE] = ripng_interface_vrf_update,
[ZEBRA_REDISTRIBUTE_ROUTE_ADD] = ripng_zebra_read_route,
[ZEBRA_REDISTRIBUTE_ROUTE_DEL] = ripng_zebra_read_route,
};
static void ripng_zebra_capabilities(struct zclient_capabilities *cap)
{
zebra_ecmp_count = MIN(cap->ecmp, zebra_ecmp_count);
}
/* Initialize zebra structure and it's commands. */
void zebra_init(struct event_loop *master)
{
/* Allocate zebra structure. */
zclient = zclient_new(master, &zclient_options_default, ripng_handlers,
array_size(ripng_handlers));
zclient_init(zclient, ZEBRA_ROUTE_RIPNG, 0, &ripngd_privs);
zclient->zebra_connected = ripng_zebra_connected;
zclient->zebra_capabilities = ripng_zebra_capabilities;
}
void ripng_zebra_stop(void)
{
zclient_stop(zclient);
zclient_free(zclient);
}
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