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/*
* IS-IS Rout(e)ing protocol - isis_zebra.c
*
* Copyright (C) 2001,2002 Sampo Saaristo
* Tampere University of Technology
* Institute of Communications Engineering
* Copyright (C) 2013-2015 Christian Franke <chris@opensourcerouting.org>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public Licenseas 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 "thread.h"
#include "command.h"
#include "memory.h"
#include "log.h"
#include "if.h"
#include "network.h"
#include "prefix.h"
#include "zclient.h"
#include "stream.h"
#include "linklist.h"
#include "nexthop.h"
#include "vrf.h"
#include "libfrr.h"
#include "isisd/dict.h"
#include "isisd/isis_constants.h"
#include "isisd/isis_common.h"
#include "isisd/isis_flags.h"
#include "isisd/isis_misc.h"
#include "isisd/isis_circuit.h"
#include "isisd/isisd.h"
#include "isisd/isis_circuit.h"
#include "isisd/isis_csm.h"
#include "isisd/isis_lsp.h"
#include "isisd/isis_route.h"
#include "isisd/isis_zebra.h"
#include "isisd/isis_te.h"
struct zclient *zclient = NULL;
/* Router-id update message from zebra. */
static int isis_router_id_update_zebra(int command, struct zclient *zclient,
zebra_size_t length, vrf_id_t vrf_id)
{
struct isis_area *area;
struct listnode *node;
struct prefix router_id;
/*
* If ISIS TE is enable, TE Router ID is set through specific command.
* See mpls_te_router_addr() command in isis_te.c
*/
if (IS_MPLS_TE(isisMplsTE))
return 0;
zebra_router_id_update_read(zclient->ibuf, &router_id);
if (isis->router_id == router_id.u.prefix4.s_addr)
return 0;
isis->router_id = router_id.u.prefix4.s_addr;
for (ALL_LIST_ELEMENTS_RO(isis->area_list, node, area))
if (listcount(area->area_addrs) > 0)
lsp_regenerate_schedule(area, area->is_type, 0);
return 0;
}
static int isis_zebra_if_add(int command, struct zclient *zclient,
zebra_size_t length, vrf_id_t vrf_id)
{
struct interface *ifp;
ifp = zebra_interface_add_read(zclient->ibuf, vrf_id);
if (isis->debugs & DEBUG_ZEBRA)
zlog_debug(
"Zebra I/F add: %s index %d flags %ld metric %d mtu %d",
ifp->name, ifp->ifindex, (long)ifp->flags, ifp->metric,
ifp->mtu);
if (if_is_operative(ifp))
isis_csm_state_change(IF_UP_FROM_Z, circuit_scan_by_ifp(ifp),
ifp);
return 0;
}
static int isis_zebra_if_del(int command, struct zclient *zclient,
zebra_size_t length, vrf_id_t vrf_id)
{
struct interface *ifp;
struct stream *s;
s = zclient->ibuf;
ifp = zebra_interface_state_read(s, vrf_id);
if (!ifp)
return 0;
if (if_is_operative(ifp))
zlog_warn("Zebra: got delete of %s, but interface is still up",
ifp->name);
if (isis->debugs & DEBUG_ZEBRA)
zlog_debug(
"Zebra I/F delete: %s index %d flags %ld metric %d mtu %d",
ifp->name, ifp->ifindex, (long)ifp->flags, ifp->metric,
ifp->mtu);
isis_csm_state_change(IF_DOWN_FROM_Z, circuit_scan_by_ifp(ifp), ifp);
/* Cannot call if_delete because we should retain the pseudo interface
in case there is configuration info attached to it. */
if_delete_retain(ifp);
if_set_index(ifp, IFINDEX_INTERNAL);
return 0;
}
static int isis_zebra_if_state_up(int command, struct zclient *zclient,
zebra_size_t length, vrf_id_t vrf_id)
{
struct interface *ifp;
ifp = zebra_interface_state_read(zclient->ibuf, vrf_id);
if (ifp == NULL)
return 0;
isis_csm_state_change(IF_UP_FROM_Z, circuit_scan_by_ifp(ifp), ifp);
return 0;
}
static int isis_zebra_if_state_down(int command, struct zclient *zclient,
zebra_size_t length, vrf_id_t vrf_id)
{
struct interface *ifp;
struct isis_circuit *circuit;
ifp = zebra_interface_state_read(zclient->ibuf, vrf_id);
if (ifp == NULL)
return 0;
circuit = isis_csm_state_change(IF_DOWN_FROM_Z,
circuit_scan_by_ifp(ifp), ifp);
if (circuit)
SET_FLAG(circuit->flags, ISIS_CIRCUIT_FLAPPED_AFTER_SPF);
return 0;
}
static int isis_zebra_if_address_add(int command, struct zclient *zclient,
zebra_size_t length, vrf_id_t vrf_id)
{
struct connected *c;
struct prefix *p;
char buf[PREFIX2STR_BUFFER];
c = zebra_interface_address_read(ZEBRA_INTERFACE_ADDRESS_ADD,
zclient->ibuf, vrf_id);
if (c == NULL)
return 0;
p = c->address;
prefix2str(p, buf, sizeof(buf));
#ifdef EXTREME_DEBUG
if (p->family == AF_INET)
zlog_debug("connected IP address %s", buf);
if (p->family == AF_INET6)
zlog_debug("connected IPv6 address %s", buf);
#endif /* EXTREME_DEBUG */
if (if_is_operative(c->ifp))
isis_circuit_add_addr(circuit_scan_by_ifp(c->ifp), c);
return 0;
}
static int isis_zebra_if_address_del(int command, struct zclient *client,
zebra_size_t length, vrf_id_t vrf_id)
{
struct connected *c;
struct interface *ifp;
#ifdef EXTREME_DEBUG
struct prefix *p;
char buf[PREFIX2STR_BUFFER];
#endif /* EXTREME_DEBUG */
c = zebra_interface_address_read(ZEBRA_INTERFACE_ADDRESS_DELETE,
zclient->ibuf, vrf_id);
if (c == NULL)
return 0;
ifp = c->ifp;
#ifdef EXTREME_DEBUG
p = c->address;
prefix2str(p, buf, sizeof(buf));
if (p->family == AF_INET)
zlog_debug("disconnected IP address %s", buf);
if (p->family == AF_INET6)
zlog_debug("disconnected IPv6 address %s", buf);
#endif /* EXTREME_DEBUG */
if (if_is_operative(ifp))
isis_circuit_del_addr(circuit_scan_by_ifp(ifp), c);
connected_free(c);
return 0;
}
static int isis_zebra_link_params(int command, struct zclient *zclient,
zebra_size_t length)
{
struct interface *ifp;
ifp = zebra_interface_link_params_read(zclient->ibuf);
if (ifp == NULL)
return 0;
/* Update TE TLV */
isis_mpls_te_update(ifp);
return 0;
}
static void isis_zebra_route_add_route(struct prefix *prefix,
struct isis_route_info *route_info)
{
struct zapi_route api;
struct zapi_nexthop *api_nh;
struct isis_nexthop *nexthop;
struct isis_nexthop6 *nexthop6;
struct listnode *node;
int count = 0;
if (CHECK_FLAG(route_info->flag, ISIS_ROUTE_FLAG_ZEBRA_SYNCED))
return;
memset(&api, 0, sizeof(api));
api.vrf_id = VRF_DEFAULT;
api.type = ZEBRA_ROUTE_ISIS;
api.safi = SAFI_UNICAST;
api.prefix = *prefix;
SET_FLAG(api.message, ZAPI_MESSAGE_NEXTHOP);
SET_FLAG(api.message, ZAPI_MESSAGE_METRIC);
api.metric = route_info->cost;
#if 0
SET_FLAG(api.message, ZAPI_MESSAGE_DISTANCE);
api.distance = route_info->depth;
#endif
/* Nexthops */
switch (prefix->family) {
case AF_INET:
for (ALL_LIST_ELEMENTS_RO(route_info->nexthops, node,
nexthop)) {
if (count >= MULTIPATH_NUM)
break;
api_nh = &api.nexthops[count];
/* FIXME: can it be ? */
if (nexthop->ip.s_addr != INADDR_ANY) {
api_nh->type = NEXTHOP_TYPE_IPV4_IFINDEX;
api_nh->gate.ipv4 = nexthop->ip;
} else {
api_nh->type = NEXTHOP_TYPE_IFINDEX;
}
api_nh->ifindex = nexthop->ifindex;
count++;
}
break;
case AF_INET6:
for (ALL_LIST_ELEMENTS_RO(route_info->nexthops6, node,
nexthop6)) {
if (count >= MULTIPATH_NUM)
break;
if (!IN6_IS_ADDR_LINKLOCAL(&nexthop6->ip6)
&& !IN6_IS_ADDR_UNSPECIFIED(&nexthop6->ip6)) {
continue;
}
api_nh = &api.nexthops[count];
api_nh->gate.ipv6 = nexthop6->ip6;
api_nh->ifindex = nexthop6->ifindex;
api_nh->type = NEXTHOP_TYPE_IPV6_IFINDEX;
count++;
}
break;
}
if (!count)
return;
api.nexthop_num = count;
zclient_route_send(ZEBRA_ROUTE_ADD, zclient, &api);
SET_FLAG(route_info->flag, ISIS_ROUTE_FLAG_ZEBRA_SYNCED);
UNSET_FLAG(route_info->flag, ISIS_ROUTE_FLAG_ZEBRA_RESYNC);
}
static void isis_zebra_route_del_route(struct prefix *prefix,
struct isis_route_info *route_info)
{
struct zapi_route api;
if (!CHECK_FLAG(route_info->flag, ISIS_ROUTE_FLAG_ZEBRA_SYNCED))
return;
memset(&api, 0, sizeof(api));
api.vrf_id = VRF_DEFAULT;
api.type = ZEBRA_ROUTE_ISIS;
api.safi = SAFI_UNICAST;
api.prefix = *prefix;
zclient_route_send(ZEBRA_ROUTE_DELETE, zclient, &api);
UNSET_FLAG(route_info->flag, ISIS_ROUTE_FLAG_ZEBRA_SYNCED);
}
void isis_zebra_route_update(struct prefix *prefix,
struct isis_route_info *route_info)
{
if (zclient->sock < 0)
return;
if (CHECK_FLAG(route_info->flag, ISIS_ROUTE_FLAG_ACTIVE))
isis_zebra_route_add_route(prefix, route_info);
else
isis_zebra_route_del_route(prefix, route_info);
}
static int isis_zebra_read(int command, struct zclient *zclient,
zebra_size_t length, vrf_id_t vrf_id)
{
struct zapi_route api;
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;
/*
* Avoid advertising a false default reachability. (A default
* route installed by IS-IS gets redistributed from zebra back
* into IS-IS causing us to start advertising default reachabity
* without this check)
*/
if (api.prefix.prefixlen == 0 && api.type == ZEBRA_ROUTE_ISIS)
command = ZEBRA_REDISTRIBUTE_ROUTE_DEL;
if (command == ZEBRA_REDISTRIBUTE_ROUTE_ADD)
isis_redist_add(api.type, &api.prefix, api.distance,
api.metric);
else
isis_redist_delete(api.type, &api.prefix);
return 0;
}
int isis_distribute_list_update(int routetype)
{
return 0;
}
void isis_zebra_redistribute_set(afi_t afi, int type)
{
if (type == DEFAULT_ROUTE)
zclient_redistribute_default(ZEBRA_REDISTRIBUTE_DEFAULT_ADD,
zclient, VRF_DEFAULT);
else
zclient_redistribute(ZEBRA_REDISTRIBUTE_ADD, zclient, afi, type,
0, VRF_DEFAULT);
}
void isis_zebra_redistribute_unset(afi_t afi, int type)
{
if (type == DEFAULT_ROUTE)
zclient_redistribute_default(ZEBRA_REDISTRIBUTE_DEFAULT_DELETE,
zclient, VRF_DEFAULT);
else
zclient_redistribute(ZEBRA_REDISTRIBUTE_DELETE, zclient, afi,
type, 0, VRF_DEFAULT);
}
static void isis_zebra_connected(struct zclient *zclient)
{
zclient_send_reg_requests(zclient, VRF_DEFAULT);
}
void isis_zebra_init(struct thread_master *master)
{
zclient = zclient_new_notify(master, &zclient_options_default);
zclient_init(zclient, ZEBRA_ROUTE_ISIS, 0, &isisd_privs);
zclient->zebra_connected = isis_zebra_connected;
zclient->router_id_update = isis_router_id_update_zebra;
zclient->interface_add = isis_zebra_if_add;
zclient->interface_delete = isis_zebra_if_del;
zclient->interface_up = isis_zebra_if_state_up;
zclient->interface_down = isis_zebra_if_state_down;
zclient->interface_address_add = isis_zebra_if_address_add;
zclient->interface_address_delete = isis_zebra_if_address_del;
zclient->interface_link_params = isis_zebra_link_params;
zclient->redistribute_route_add = isis_zebra_read;
zclient->redistribute_route_del = isis_zebra_read;
return;
}
void isis_zebra_stop(void)
{
zclient_stop(zclient);
zclient_free(zclient);
frr_fini();
}
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