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/*
* Static NHT code.
* Copyright (C) 2018 Cumulus Networks, Inc.
* Donald Sharp
*
* This program 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 of the License, or (at your option)
* any later version.
*
* This program 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
*/
#include <zebra.h>
#include "prefix.h"
#include "table.h"
#include "vrf.h"
#include "nexthop.h"
#include "srcdest_table.h"
#include "static_vrf.h"
#include "static_routes.h"
#include "static_zebra.h"
#include "static_nht.h"
static void static_nht_update_path(struct static_path *pn, struct prefix *nhp,
uint32_t nh_num, vrf_id_t nh_vrf_id,
struct vrf *vrf)
{
struct static_nexthop *nh;
frr_each(static_nexthop_list, &pn->nexthop_list, nh) {
if (nh->nh_vrf_id != nh_vrf_id)
continue;
if (nh->type != STATIC_IPV4_GATEWAY
&& nh->type != STATIC_IPV4_GATEWAY_IFNAME
&& nh->type != STATIC_IPV6_GATEWAY
&& nh->type != STATIC_IPV6_GATEWAY_IFNAME)
continue;
if (nhp->family == AF_INET
&& nhp->u.prefix4.s_addr == nh->addr.ipv4.s_addr)
nh->nh_valid = !!nh_num;
if (nhp->family == AF_INET6
&& memcmp(&nhp->u.prefix6, &nh->addr.ipv6, IPV6_MAX_BYTELEN)
== 0)
nh->nh_valid = !!nh_num;
if (nh->state == STATIC_START)
static_zebra_route_add(pn, true);
}
}
static void static_nht_update_safi(struct prefix *sp, struct prefix *nhp,
uint32_t nh_num, afi_t afi, safi_t safi,
struct vrf *vrf, vrf_id_t nh_vrf_id)
{
struct route_table *stable;
struct static_vrf *svrf;
struct route_node *rn;
struct static_path *pn;
struct static_route_info *si;
svrf = vrf->info;
if (!svrf)
return;
stable = static_vrf_static_table(afi, safi, svrf);
if (!stable)
return;
if (sp) {
rn = srcdest_rnode_lookup(stable, sp, NULL);
if (rn && rn->info) {
si = static_route_info_from_rnode(rn);
frr_each(static_path_list, &si->path_list, pn) {
static_nht_update_path(pn, nhp, nh_num,
nh_vrf_id, vrf);
}
route_unlock_node(rn);
}
return;
}
for (rn = route_top(stable); rn; rn = route_next(rn)) {
si = static_route_info_from_rnode(rn);
if (!si)
continue;
frr_each(static_path_list, &si->path_list, pn) {
static_nht_update_path(pn, nhp, nh_num, nh_vrf_id, vrf);
}
}
}
void static_nht_update(struct prefix *sp, struct prefix *nhp,
uint32_t nh_num, afi_t afi, vrf_id_t nh_vrf_id)
{
struct vrf *vrf;
RB_FOREACH (vrf, vrf_name_head, &vrfs_by_name) {
static_nht_update_safi(sp, nhp, nh_num, afi, SAFI_UNICAST,
vrf, nh_vrf_id);
static_nht_update_safi(sp, nhp, nh_num, afi, SAFI_MULTICAST,
vrf, nh_vrf_id);
}
}
static void static_nht_reset_start_safi(struct prefix *nhp, afi_t afi,
safi_t safi, struct vrf *vrf,
vrf_id_t nh_vrf_id)
{
struct static_vrf *svrf;
struct route_table *stable;
struct static_nexthop *nh;
struct static_path *pn;
struct route_node *rn;
struct static_route_info *si;
svrf = vrf->info;
if (!svrf)
return;
stable = static_vrf_static_table(afi, safi, svrf);
if (!stable)
return;
for (rn = route_top(stable); rn; rn = route_next(rn)) {
si = static_route_info_from_rnode(rn);
if (!si)
continue;
frr_each(static_path_list, &si->path_list, pn) {
frr_each(static_nexthop_list, &pn->nexthop_list, nh) {
if (nh->nh_vrf_id != nh_vrf_id)
continue;
if (nhp->family == AF_INET
&& nhp->u.prefix4.s_addr
!= nh->addr.ipv4.s_addr)
continue;
if (nhp->family == AF_INET6
&& memcmp(&nhp->u.prefix6, &nh->addr.ipv6,
16)
!= 0)
continue;
/*
* We've been told that a nexthop we
* depend on has changed in some manner,
* so reset the state machine to allow
* us to start over.
*/
nh->state = STATIC_START;
}
}
}
}
void static_nht_reset_start(struct prefix *nhp, afi_t afi, vrf_id_t nh_vrf_id)
{
struct vrf *vrf;
RB_FOREACH (vrf, vrf_name_head, &vrfs_by_name) {
static_nht_reset_start_safi(nhp, afi, SAFI_UNICAST,
vrf, nh_vrf_id);
static_nht_reset_start_safi(nhp, afi, SAFI_MULTICAST,
vrf, nh_vrf_id);
}
}
static void static_nht_mark_state_safi(struct prefix *sp, afi_t afi,
safi_t safi, struct vrf *vrf,
enum static_install_states state)
{
struct static_vrf *svrf;
struct route_table *stable;
struct route_node *rn;
struct static_nexthop *nh;
struct static_path *pn;
struct static_route_info *si;
svrf = vrf->info;
if (!svrf)
return;
stable = static_vrf_static_table(afi, safi, svrf);
if (!stable)
return;
rn = srcdest_rnode_lookup(stable, sp, NULL);
if (!rn)
return;
si = rn->info;
if (si) {
frr_each(static_path_list, &si->path_list, pn) {
frr_each(static_nexthop_list, &pn->nexthop_list, nh) {
nh->state = state;
}
}
}
route_unlock_node(rn);
}
void static_nht_mark_state(struct prefix *sp, vrf_id_t vrf_id,
enum static_install_states state)
{
struct vrf *vrf;
afi_t afi = AFI_IP;
if (sp->family == AF_INET6)
afi = AFI_IP6;
vrf = vrf_lookup_by_id(vrf_id);
if (!vrf || !vrf->info)
return;
static_nht_mark_state_safi(sp, afi, SAFI_UNICAST, vrf, state);
static_nht_mark_state_safi(sp, afi, SAFI_MULTICAST, vrf, state);
}
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