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mirror_frr/bgpd/bgp_zebra.c
Donald Sharp d5b2119cb4 *: Send/receive the nexthop vrf_id 
Modify the code to send and receive to/from zebra
the nexthops vrf_id.

Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>
2018-01-12 09:22:07 -05:00

1870 lines
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/* zebra client
* Copyright (C) 1997, 98, 99 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
*/
#include <zebra.h>
#include "command.h"
#include "stream.h"
#include "network.h"
#include "prefix.h"
#include "log.h"
#include "sockunion.h"
#include "zclient.h"
#include "routemap.h"
#include "thread.h"
#include "queue.h"
#include "memory.h"
#include "lib/json.h"
#include "lib/bfd.h"
#include "filter.h"
#include "mpls.h"
#include "vxlan.h"
#include "bgpd/bgpd.h"
#include "bgpd/bgp_route.h"
#include "bgpd/bgp_attr.h"
#include "bgpd/bgp_nexthop.h"
#include "bgpd/bgp_zebra.h"
#include "bgpd/bgp_fsm.h"
#include "bgpd/bgp_debug.h"
#include "bgpd/bgp_mpath.h"
#include "bgpd/bgp_nexthop.h"
#include "bgpd/bgp_nht.h"
#include "bgpd/bgp_bfd.h"
#include "bgpd/bgp_label.h"
#if ENABLE_BGP_VNC
#include "bgpd/rfapi/rfapi_backend.h"
#include "bgpd/rfapi/vnc_export_bgp.h"
#endif
#include "bgpd/bgp_evpn.h"
/* All information about zebra. */
struct zclient *zclient = NULL;
/* Can we install into zebra? */
static inline int bgp_install_info_to_zebra(struct bgp *bgp)
{
if (zclient->sock <= 0)
return 0;
if (!IS_BGP_INST_KNOWN_TO_ZEBRA(bgp))
return 0;
return 1;
}
int zclient_num_connects;
/* Router-id update message from zebra. */
static int bgp_router_id_update(int command, struct zclient *zclient,
zebra_size_t length, vrf_id_t vrf_id)
{
struct prefix router_id;
zebra_router_id_update_read(zclient->ibuf, &router_id);
if (BGP_DEBUG(zebra, ZEBRA)) {
char buf[PREFIX2STR_BUFFER];
prefix2str(&router_id, buf, sizeof(buf));
zlog_debug("Rx Router Id update VRF %u Id %s", vrf_id, buf);
}
bgp_router_id_zebra_bump(vrf_id, &router_id);
return 0;
}
/* Nexthop update message from zebra. */
static int bgp_read_nexthop_update(int command, struct zclient *zclient,
zebra_size_t length, vrf_id_t vrf_id)
{
bgp_parse_nexthop_update(command, vrf_id);
return 0;
}
static int bgp_read_import_check_update(int command, struct zclient *zclient,
zebra_size_t length, vrf_id_t vrf_id)
{
bgp_parse_nexthop_update(command, vrf_id);
return 0;
}
/* Set or clear interface on which unnumbered neighbor is configured. This
* would in turn cause BGP to initiate or turn off IPv6 RAs on this
* interface.
*/
static void bgp_update_interface_nbrs(struct bgp *bgp, struct interface *ifp,
struct interface *upd_ifp)
{
struct listnode *node, *nnode;
struct peer *peer;
for (ALL_LIST_ELEMENTS(bgp->peer, node, nnode, peer)) {
if (peer->conf_if && (strcmp(peer->conf_if, ifp->name) == 0)) {
if (upd_ifp) {
peer->ifp = upd_ifp;
bgp_zebra_initiate_radv(bgp, peer);
} else {
bgp_zebra_terminate_radv(bgp, peer);
peer->ifp = upd_ifp;
}
}
}
}
static int bgp_read_fec_update(int command, struct zclient *zclient,
zebra_size_t length)
{
bgp_parse_fec_update();
return 0;
}
static void bgp_start_interface_nbrs(struct bgp *bgp, struct interface *ifp)
{
struct listnode *node, *nnode;
struct peer *peer;
for (ALL_LIST_ELEMENTS(bgp->peer, node, nnode, peer)) {
if (peer->conf_if && (strcmp(peer->conf_if, ifp->name) == 0)
&& peer->status != Established) {
if (peer_active(peer))
BGP_EVENT_ADD(peer, BGP_Stop);
BGP_EVENT_ADD(peer, BGP_Start);
}
}
}
static void bgp_nbr_connected_add(struct bgp *bgp, struct nbr_connected *ifc)
{
struct listnode *node;
struct connected *connected;
struct interface *ifp;
struct prefix *p;
/* Kick-off the FSM for any relevant peers only if there is a
* valid local address on the interface.
*/
ifp = ifc->ifp;
for (ALL_LIST_ELEMENTS_RO(ifp->connected, node, connected)) {
p = connected->address;
if (p->family == AF_INET6
&& IN6_IS_ADDR_LINKLOCAL(&p->u.prefix6))
break;
}
if (!connected)
return;
bgp_start_interface_nbrs(bgp, ifp);
}
static void bgp_nbr_connected_delete(struct bgp *bgp, struct nbr_connected *ifc,
int del)
{
struct listnode *node, *nnode;
struct peer *peer;
struct interface *ifp;
for (ALL_LIST_ELEMENTS(bgp->peer, node, nnode, peer)) {
if (peer->conf_if
&& (strcmp(peer->conf_if, ifc->ifp->name) == 0)) {
peer->last_reset = PEER_DOWN_NBR_ADDR_DEL;
BGP_EVENT_ADD(peer, BGP_Stop);
}
}
/* Free neighbor also, if we're asked to. */
if (del) {
ifp = ifc->ifp;
listnode_delete(ifp->nbr_connected, ifc);
nbr_connected_free(ifc);
}
}
/* Inteface addition message from zebra. */
static int bgp_interface_add(int command, struct zclient *zclient,
zebra_size_t length, vrf_id_t vrf_id)
{
struct interface *ifp;
struct bgp *bgp;
ifp = zebra_interface_add_read(zclient->ibuf, vrf_id);
if (!ifp) // unexpected
return 0;
if (BGP_DEBUG(zebra, ZEBRA) && ifp)
zlog_debug("Rx Intf add VRF %u IF %s", vrf_id, ifp->name);
bgp = bgp_lookup_by_vrf_id(vrf_id);
if (!bgp)
return 0;
bgp_update_interface_nbrs(bgp, ifp, ifp);
return 0;
}
static int bgp_interface_delete(int command, struct zclient *zclient,
zebra_size_t length, vrf_id_t vrf_id)
{
struct stream *s;
struct interface *ifp;
struct bgp *bgp;
bgp = bgp_lookup_by_vrf_id(vrf_id);
if (!bgp)
return 0;
s = zclient->ibuf;
ifp = zebra_interface_state_read(s, vrf_id);
if (!ifp) /* This may happen if we've just unregistered for a VRF. */
return 0;
if (BGP_DEBUG(zebra, ZEBRA))
zlog_debug("Rx Intf del VRF %u IF %s", vrf_id, ifp->name);
bgp_update_interface_nbrs(bgp, ifp, NULL);
if_set_index(ifp, IFINDEX_INTERNAL);
return 0;
}
static int bgp_interface_up(int command, struct zclient *zclient,
zebra_size_t length, vrf_id_t vrf_id)
{
struct stream *s;
struct interface *ifp;
struct connected *c;
struct nbr_connected *nc;
struct listnode *node, *nnode;
struct bgp *bgp;
bgp = bgp_lookup_by_vrf_id(vrf_id);
if (!bgp)
return 0;
s = zclient->ibuf;
ifp = zebra_interface_state_read(s, vrf_id);
if (!ifp)
return 0;
if (BGP_DEBUG(zebra, ZEBRA))
zlog_debug("Rx Intf up VRF %u IF %s", vrf_id, ifp->name);
for (ALL_LIST_ELEMENTS(ifp->connected, node, nnode, c))
bgp_connected_add(bgp, c);
for (ALL_LIST_ELEMENTS(ifp->nbr_connected, node, nnode, nc))
bgp_nbr_connected_add(bgp, nc);
return 0;
}
static int bgp_interface_down(int command, struct zclient *zclient,
zebra_size_t length, vrf_id_t vrf_id)
{
struct stream *s;
struct interface *ifp;
struct connected *c;
struct nbr_connected *nc;
struct listnode *node, *nnode;
struct bgp *bgp;
bgp = bgp_lookup_by_vrf_id(vrf_id);
if (!bgp)
return 0;
s = zclient->ibuf;
ifp = zebra_interface_state_read(s, vrf_id);
if (!ifp)
return 0;
if (BGP_DEBUG(zebra, ZEBRA))
zlog_debug("Rx Intf down VRF %u IF %s", vrf_id, ifp->name);
for (ALL_LIST_ELEMENTS(ifp->connected, node, nnode, c))
bgp_connected_delete(bgp, c);
for (ALL_LIST_ELEMENTS(ifp->nbr_connected, node, nnode, nc))
bgp_nbr_connected_delete(bgp, nc, 1);
/* Fast external-failover */
{
struct peer *peer;
if (CHECK_FLAG(bgp->flags, BGP_FLAG_NO_FAST_EXT_FAILOVER))
return 0;
for (ALL_LIST_ELEMENTS(bgp->peer, node, nnode, peer)) {
#if defined(HAVE_CUMULUS)
/* Take down directly connected EBGP peers as well as
* 1-hop BFD
* tracked (directly connected) IBGP peers.
*/
if ((peer->ttl != 1) && (peer->gtsm_hops != 1)
&& (!peer->bfd_info
|| bgp_bfd_is_peer_multihop(peer)))
#else
/* Take down directly connected EBGP peers */
if ((peer->ttl != 1) && (peer->gtsm_hops != 1))
#endif
continue;
if (ifp == peer->nexthop.ifp) {
BGP_EVENT_ADD(peer, BGP_Stop);
peer->last_reset = PEER_DOWN_IF_DOWN;
}
}
}
return 0;
}
static int bgp_interface_address_add(int command, struct zclient *zclient,
zebra_size_t length, vrf_id_t vrf_id)
{
struct connected *ifc;
struct bgp *bgp;
bgp = bgp_lookup_by_vrf_id(vrf_id);
if (!bgp)
return 0;
ifc = zebra_interface_address_read(command, zclient->ibuf, vrf_id);
if (ifc == NULL)
return 0;
if (bgp_debug_zebra(ifc->address)) {
char buf[PREFIX2STR_BUFFER];
prefix2str(ifc->address, buf, sizeof(buf));
zlog_debug("Rx Intf address add VRF %u IF %s addr %s", vrf_id,
ifc->ifp->name, buf);
}
if (if_is_operative(ifc->ifp)) {
bgp_connected_add(bgp, ifc);
/* If we have learnt of any neighbors on this interface,
* check to kick off any BGP interface-based neighbors,
* but only if this is a link-local address.
*/
if (IN6_IS_ADDR_LINKLOCAL(&ifc->address->u.prefix6)
&& !list_isempty(ifc->ifp->nbr_connected))
bgp_start_interface_nbrs(bgp, ifc->ifp);
}
return 0;
}
static int bgp_interface_address_delete(int command, struct zclient *zclient,
zebra_size_t length, vrf_id_t vrf_id)
{
struct connected *ifc;
struct bgp *bgp;
bgp = bgp_lookup_by_vrf_id(vrf_id);
if (!bgp)
return 0;
ifc = zebra_interface_address_read(command, zclient->ibuf, vrf_id);
if (ifc == NULL)
return 0;
if (bgp_debug_zebra(ifc->address)) {
char buf[PREFIX2STR_BUFFER];
prefix2str(ifc->address, buf, sizeof(buf));
zlog_debug("Rx Intf address del VRF %u IF %s addr %s", vrf_id,
ifc->ifp->name, buf);
}
if (if_is_operative(ifc->ifp)) {
bgp_connected_delete(bgp, ifc);
}
connected_free(ifc);
return 0;
}
static int bgp_interface_nbr_address_add(int command, struct zclient *zclient,
zebra_size_t length, vrf_id_t vrf_id)
{
struct nbr_connected *ifc = NULL;
struct bgp *bgp;
ifc = zebra_interface_nbr_address_read(command, zclient->ibuf, vrf_id);
if (ifc == NULL)
return 0;
if (bgp_debug_zebra(ifc->address)) {
char buf[PREFIX2STR_BUFFER];
prefix2str(ifc->address, buf, sizeof(buf));
zlog_debug("Rx Intf neighbor add VRF %u IF %s addr %s", vrf_id,
ifc->ifp->name, buf);
}
if (if_is_operative(ifc->ifp)) {
bgp = bgp_lookup_by_vrf_id(vrf_id);
if (bgp)
bgp_nbr_connected_add(bgp, ifc);
}
return 0;
}
static int bgp_interface_nbr_address_delete(int command,
struct zclient *zclient,
zebra_size_t length,
vrf_id_t vrf_id)
{
struct nbr_connected *ifc = NULL;
struct bgp *bgp;
ifc = zebra_interface_nbr_address_read(command, zclient->ibuf, vrf_id);
if (ifc == NULL)
return 0;
if (bgp_debug_zebra(ifc->address)) {
char buf[PREFIX2STR_BUFFER];
prefix2str(ifc->address, buf, sizeof(buf));
zlog_debug("Rx Intf neighbor del VRF %u IF %s addr %s", vrf_id,
ifc->ifp->name, buf);
}
if (if_is_operative(ifc->ifp)) {
bgp = bgp_lookup_by_vrf_id(vrf_id);
if (bgp)
bgp_nbr_connected_delete(bgp, ifc, 0);
}
nbr_connected_free(ifc);
return 0;
}
/* VRF update for an interface. */
static int bgp_interface_vrf_update(int command, struct zclient *zclient,
zebra_size_t length, vrf_id_t vrf_id)
{
struct interface *ifp;
vrf_id_t new_vrf_id;
struct connected *c;
struct nbr_connected *nc;
struct listnode *node, *nnode;
struct bgp *bgp;
ifp = zebra_interface_vrf_update_read(zclient->ibuf, vrf_id,
&new_vrf_id);
if (!ifp)
return 0;
if (BGP_DEBUG(zebra, ZEBRA) && ifp)
zlog_debug("Rx Intf VRF change VRF %u IF %s NewVRF %u", vrf_id,
ifp->name, new_vrf_id);
bgp = bgp_lookup_by_vrf_id(vrf_id);
if (!bgp)
return 0;
for (ALL_LIST_ELEMENTS(ifp->connected, node, nnode, c))
bgp_connected_delete(bgp, c);
for (ALL_LIST_ELEMENTS(ifp->nbr_connected, node, nnode, nc))
bgp_nbr_connected_delete(bgp, nc, 1);
/* Fast external-failover */
{
struct peer *peer;
if (CHECK_FLAG(bgp->flags, BGP_FLAG_NO_FAST_EXT_FAILOVER))
return 0;
for (ALL_LIST_ELEMENTS(bgp->peer, node, nnode, peer)) {
if ((peer->ttl != 1) && (peer->gtsm_hops != 1))
continue;
if (ifp == peer->nexthop.ifp)
BGP_EVENT_ADD(peer, BGP_Stop);
}
}
if_update_to_new_vrf(ifp, new_vrf_id);
bgp = bgp_lookup_by_vrf_id(new_vrf_id);
if (!bgp)
return 0;
for (ALL_LIST_ELEMENTS(ifp->connected, node, nnode, c))
bgp_connected_add(bgp, c);
for (ALL_LIST_ELEMENTS(ifp->nbr_connected, node, nnode, nc))
bgp_nbr_connected_add(bgp, nc);
return 0;
}
/* Zebra route add and delete treatment. */
static int zebra_read_route(int command, struct zclient *zclient,
zebra_size_t length, vrf_id_t vrf_id)
{
enum nexthop_types_t nhtype;
struct zapi_route api;
union g_addr nexthop;
ifindex_t ifindex;
int add, i;
struct bgp *bgp;
bgp = bgp_lookup_by_vrf_id(vrf_id);
if (!bgp)
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;
/* ignore link-local address. */
if (api.prefix.family == AF_INET6
&& IN6_IS_ADDR_LINKLOCAL(&api.prefix.u.prefix6))
return 0;
nexthop = api.nexthops[0].gate;
ifindex = api.nexthops[0].ifindex;
nhtype = api.nexthops[0].type;
add = (command == ZEBRA_REDISTRIBUTE_ROUTE_ADD);
if (add) {
/*
* The ADD message is actually an UPDATE and there is no
* explicit DEL
* for a prior redistributed route, if any. So, perform an
* implicit
* DEL processing for the same redistributed route from any
* other
* source type.
*/
for (i = 0; i < ZEBRA_ROUTE_MAX; i++) {
if (i != api.type)
bgp_redistribute_delete(bgp, &api.prefix, i,
api.instance);
}
/* Now perform the add/update. */
bgp_redistribute_add(bgp, &api.prefix, &nexthop, ifindex,
nhtype, api.metric, api.type,
api.instance, api.tag);
} else {
bgp_redistribute_delete(bgp, &api.prefix, api.type,
api.instance);
}
if (bgp_debug_zebra(&api.prefix)) {
char buf[2][PREFIX_STRLEN];
prefix2str(&api.prefix, buf[0], sizeof(buf[0]));
inet_ntop(api.prefix.family, &nexthop, buf[1], sizeof(buf[1]));
zlog_debug(
"Rx route %s VRF %u %s[%d] %s "
"nexthop %s metric %u tag %" ROUTE_TAG_PRI,
(add) ? "add" : "delete", vrf_id,
zebra_route_string(api.type), api.instance, buf[0],
buf[1], api.metric, api.tag);
}
return 0;
}
struct interface *if_lookup_by_ipv4(struct in_addr *addr, vrf_id_t vrf_id)
{
struct vrf *vrf;
struct listnode *cnode;
struct interface *ifp;
struct connected *connected;
struct prefix_ipv4 p;
struct prefix *cp;
vrf = vrf_lookup_by_id(vrf_id);
if (!vrf)
return NULL;
p.family = AF_INET;
p.prefix = *addr;
p.prefixlen = IPV4_MAX_BITLEN;
FOR_ALL_INTERFACES (vrf, ifp) {
for (ALL_LIST_ELEMENTS_RO(ifp->connected, cnode, connected)) {
cp = connected->address;
if (cp->family == AF_INET)
if (prefix_match(cp, (struct prefix *)&p))
return ifp;
}
}
return NULL;
}
struct interface *if_lookup_by_ipv4_exact(struct in_addr *addr, vrf_id_t vrf_id)
{
struct vrf *vrf;
struct listnode *cnode;
struct interface *ifp;
struct connected *connected;
struct prefix *cp;
vrf = vrf_lookup_by_id(vrf_id);
if (!vrf)
return NULL;
FOR_ALL_INTERFACES (vrf, ifp) {
for (ALL_LIST_ELEMENTS_RO(ifp->connected, cnode, connected)) {
cp = connected->address;
if (cp->family == AF_INET)
if (IPV4_ADDR_SAME(&cp->u.prefix4, addr))
return ifp;
}
}
return NULL;
}
struct interface *if_lookup_by_ipv6(struct in6_addr *addr, ifindex_t ifindex,
vrf_id_t vrf_id)
{
struct vrf *vrf;
struct listnode *cnode;
struct interface *ifp;
struct connected *connected;
struct prefix_ipv6 p;
struct prefix *cp;
vrf = vrf_lookup_by_id(vrf_id);
if (!vrf)
return NULL;
p.family = AF_INET6;
p.prefix = *addr;
p.prefixlen = IPV6_MAX_BITLEN;
FOR_ALL_INTERFACES (vrf, ifp) {
for (ALL_LIST_ELEMENTS_RO(ifp->connected, cnode, connected)) {
cp = connected->address;
if (cp->family == AF_INET6)
if (prefix_match(cp, (struct prefix *)&p)) {
if (IN6_IS_ADDR_LINKLOCAL(
&cp->u.prefix6)) {
if (ifindex == ifp->ifindex)
return ifp;
} else
return ifp;
}
}
}
return NULL;
}
struct interface *if_lookup_by_ipv6_exact(struct in6_addr *addr,
ifindex_t ifindex, vrf_id_t vrf_id)
{
struct vrf *vrf;
struct listnode *cnode;
struct interface *ifp;
struct connected *connected;
struct prefix *cp;
vrf = vrf_lookup_by_id(vrf_id);
if (!vrf)
return NULL;
FOR_ALL_INTERFACES (vrf, ifp) {
for (ALL_LIST_ELEMENTS_RO(ifp->connected, cnode, connected)) {
cp = connected->address;
if (cp->family == AF_INET6)
if (IPV6_ADDR_SAME(&cp->u.prefix6, addr)) {
if (IN6_IS_ADDR_LINKLOCAL(
&cp->u.prefix6)) {
if (ifindex == ifp->ifindex)
return ifp;
} else
return ifp;
}
}
}
return NULL;
}
static int if_get_ipv6_global(struct interface *ifp, struct in6_addr *addr)
{
struct listnode *cnode;
struct connected *connected;
struct prefix *cp;
for (ALL_LIST_ELEMENTS_RO(ifp->connected, cnode, connected)) {
cp = connected->address;
if (cp->family == AF_INET6)
if (!IN6_IS_ADDR_LINKLOCAL(&cp->u.prefix6)) {
memcpy(addr, &cp->u.prefix6, IPV6_MAX_BYTELEN);
return 1;
}
}
return 0;
}
static int if_get_ipv6_local(struct interface *ifp, struct in6_addr *addr)
{
struct listnode *cnode;
struct connected *connected;
struct prefix *cp;
for (ALL_LIST_ELEMENTS_RO(ifp->connected, cnode, connected)) {
cp = connected->address;
if (cp->family == AF_INET6)
if (IN6_IS_ADDR_LINKLOCAL(&cp->u.prefix6)) {
memcpy(addr, &cp->u.prefix6, IPV6_MAX_BYTELEN);
return 1;
}
}
return 0;
}
static int if_get_ipv4_address(struct interface *ifp, struct in_addr *addr)
{
struct listnode *cnode;
struct connected *connected;
struct prefix *cp;
for (ALL_LIST_ELEMENTS_RO(ifp->connected, cnode, connected)) {
cp = connected->address;
if ((cp->family == AF_INET)
&& !ipv4_martian(&(cp->u.prefix4))) {
*addr = cp->u.prefix4;
return 1;
}
}
return 0;
}
int bgp_nexthop_set(union sockunion *local, union sockunion *remote,
struct bgp_nexthop *nexthop, struct peer *peer)
{
int ret = 0;
struct interface *ifp = NULL;
memset(nexthop, 0, sizeof(struct bgp_nexthop));
if (!local)
return -1;
if (!remote)
return -1;
if (local->sa.sa_family == AF_INET) {
nexthop->v4 = local->sin.sin_addr;
if (peer->update_if)
ifp = if_lookup_by_name(peer->update_if,
peer->bgp->vrf_id);
else
ifp = if_lookup_by_ipv4_exact(&local->sin.sin_addr,
peer->bgp->vrf_id);
}
if (local->sa.sa_family == AF_INET6) {
if (IN6_IS_ADDR_LINKLOCAL(&local->sin6.sin6_addr)) {
if (peer->conf_if || peer->ifname)
ifp = if_lookup_by_name(peer->conf_if
? peer->conf_if
: peer->ifname,
peer->bgp->vrf_id);
} else if (peer->update_if)
ifp = if_lookup_by_name(peer->update_if,
peer->bgp->vrf_id);
else
ifp = if_lookup_by_ipv6_exact(&local->sin6.sin6_addr,
local->sin6.sin6_scope_id,
peer->bgp->vrf_id);
}
if (!ifp)
return -1;
nexthop->ifp = ifp;
/* IPv4 connection, fetch and store IPv6 local address(es) if any. */
if (local->sa.sa_family == AF_INET) {
/* IPv6 nexthop*/
ret = if_get_ipv6_global(ifp, &nexthop->v6_global);
if (!ret) {
/* There is no global nexthop. Use link-local address as
* both the
* global and link-local nexthop. In this scenario, the
* expectation
* for interop is that the network admin would use a
* route-map to
* specify the global IPv6 nexthop.
*/
if_get_ipv6_local(ifp, &nexthop->v6_global);
memcpy(&nexthop->v6_local, &nexthop->v6_global,
IPV6_MAX_BYTELEN);
} else
if_get_ipv6_local(ifp, &nexthop->v6_local);
if (if_lookup_by_ipv4(&remote->sin.sin_addr, peer->bgp->vrf_id))
peer->shared_network = 1;
else
peer->shared_network = 0;
}
/* IPv6 connection, fetch and store IPv4 local address if any. */
if (local->sa.sa_family == AF_INET6) {
struct interface *direct = NULL;
/* IPv4 nexthop. */
ret = if_get_ipv4_address(ifp, &nexthop->v4);
if (!ret && peer->local_id.s_addr)
nexthop->v4 = peer->local_id;
/* Global address*/
if (!IN6_IS_ADDR_LINKLOCAL(&local->sin6.sin6_addr)) {
memcpy(&nexthop->v6_global, &local->sin6.sin6_addr,
IPV6_MAX_BYTELEN);
/* If directory connected set link-local address. */
direct = if_lookup_by_ipv6(&remote->sin6.sin6_addr,
remote->sin6.sin6_scope_id,
peer->bgp->vrf_id);
if (direct)
if_get_ipv6_local(ifp, &nexthop->v6_local);
} else
/* Link-local address. */
{
ret = if_get_ipv6_global(ifp, &nexthop->v6_global);
/* If there is no global address. Set link-local
address as
global. I know this break RFC specification... */
/* In this scenario, the expectation for interop is that
* the
* network admin would use a route-map to specify the
* global
* IPv6 nexthop.
*/
if (!ret)
memcpy(&nexthop->v6_global,
&local->sin6.sin6_addr,
IPV6_MAX_BYTELEN);
/* Always set the link-local address */
memcpy(&nexthop->v6_local, &local->sin6.sin6_addr,
IPV6_MAX_BYTELEN);
}
if (IN6_IS_ADDR_LINKLOCAL(&local->sin6.sin6_addr)
|| if_lookup_by_ipv6(&remote->sin6.sin6_addr,
remote->sin6.sin6_scope_id,
peer->bgp->vrf_id))
peer->shared_network = 1;
else
peer->shared_network = 0;
}
/* KAME stack specific treatment. */
#ifdef KAME
if (IN6_IS_ADDR_LINKLOCAL(&nexthop->v6_global)
&& IN6_LINKLOCAL_IFINDEX(nexthop->v6_global)) {
SET_IN6_LINKLOCAL_IFINDEX(nexthop->v6_global, 0);
}
if (IN6_IS_ADDR_LINKLOCAL(&nexthop->v6_local)
&& IN6_LINKLOCAL_IFINDEX(nexthop->v6_local)) {
SET_IN6_LINKLOCAL_IFINDEX(nexthop->v6_local, 0);
}
#endif /* KAME */
/* If we have identified the local interface, there is no error for now.
*/
return 0;
}
static struct in6_addr *bgp_info_to_ipv6_nexthop(struct bgp_info *info)
{
struct in6_addr *nexthop = NULL;
/* Only global address nexthop exists. */
if (info->attr->mp_nexthop_len == BGP_ATTR_NHLEN_IPV6_GLOBAL)
nexthop = &info->attr->mp_nexthop_global;
/* If both global and link-local address present. */
if (info->attr->mp_nexthop_len == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL) {
/* Check if route-map is set to prefer global over link-local */
if (info->attr->mp_nexthop_prefer_global)
nexthop = &info->attr->mp_nexthop_global;
else {
/* Workaround for Cisco's nexthop bug. */
if (IN6_IS_ADDR_UNSPECIFIED(
&info->attr->mp_nexthop_global)
&& info->peer->su_remote->sa.sa_family == AF_INET6)
nexthop =
&info->peer->su_remote->sin6.sin6_addr;
else
nexthop = &info->attr->mp_nexthop_local;
}
}
return nexthop;
}
static int bgp_table_map_apply(struct route_map *map, struct prefix *p,
struct bgp_info *info)
{
route_map_result_t ret;
ret = route_map_apply(map, p, RMAP_BGP, info);
bgp_attr_flush(info->attr);
if (ret != RMAP_DENYMATCH)
return 1;
if (bgp_debug_zebra(p)) {
if (p->family == AF_INET) {
char buf[2][INET_ADDRSTRLEN];
zlog_debug(
"Zebra rmap deny: IPv4 route %s/%d nexthop %s",
inet_ntop(AF_INET, &p->u.prefix4, buf[0],
sizeof(buf[0])),
p->prefixlen,
inet_ntop(AF_INET, &info->attr->nexthop, buf[1],
sizeof(buf[1])));
}
if (p->family == AF_INET6) {
char buf[2][INET6_ADDRSTRLEN];
zlog_debug(
"Zebra rmap deny: IPv6 route %s/%d nexthop %s",
inet_ntop(AF_INET6, &p->u.prefix6, buf[0],
sizeof(buf[0])),
p->prefixlen,
inet_ntop(AF_INET6,
bgp_info_to_ipv6_nexthop(info),
buf[1], sizeof(buf[1])));
}
}
return 0;
}
void bgp_zebra_announce(struct bgp_node *rn, struct prefix *p,
struct bgp_info *info, struct bgp *bgp, afi_t afi,
safi_t safi)
{
struct zapi_route api;
struct zapi_nexthop *api_nh;
int nh_family;
unsigned int valid_nh_count = 0;
int has_valid_label = 0;
u_char distance;
struct peer *peer;
struct bgp_info *mpinfo;
u_int32_t metric;
struct attr local_attr;
struct bgp_info local_info;
struct bgp_info *mpinfo_cp = &local_info;
route_tag_t tag;
mpls_label_t label;
/* Don't try to install if we're not connected to Zebra or Zebra doesn't
* know of this instance.
*/
if (!bgp_install_info_to_zebra(bgp))
return;
if (bgp->main_zebra_update_hold)
return;
/* Make Zebra API structure. */
memset(&api, 0, sizeof(api));
memcpy(&api.rmac, &(info->attr->rmac), sizeof(struct ethaddr));
api.vrf_id = bgp->vrf_id;
api.nh_vrf_id = bgp->vrf_id;
api.type = ZEBRA_ROUTE_BGP;
api.safi = safi;
api.prefix = *p;
SET_FLAG(api.message, ZAPI_MESSAGE_NEXTHOP);
peer = info->peer;
tag = info->attr->tag;
/* When we create an aggregate route we must also install a Null0 route
* in
* the RIB */
if (info->sub_type == BGP_ROUTE_AGGREGATE)
zapi_route_set_blackhole(&api, BLACKHOLE_NULL);
/* If it is an EVPN route mark as such.
* Currently presence of rmac in attr denotes
* this is an EVPN type-2 route
*/
if (!is_zero_mac(&(info->attr->rmac)))
SET_FLAG(api.flags, ZEBRA_FLAG_EVPN_ROUTE);
if (peer->sort == BGP_PEER_IBGP || peer->sort == BGP_PEER_CONFED
|| info->sub_type == BGP_ROUTE_AGGREGATE) {
SET_FLAG(api.flags, ZEBRA_FLAG_IBGP);
SET_FLAG(api.flags, ZEBRA_FLAG_INTERNAL);
}
if ((peer->sort == BGP_PEER_EBGP && peer->ttl != 1)
|| CHECK_FLAG(peer->flags, PEER_FLAG_DISABLE_CONNECTED_CHECK)
|| bgp_flag_check(bgp, BGP_FLAG_DISABLE_NH_CONNECTED_CHK))
SET_FLAG(api.flags, ZEBRA_FLAG_INTERNAL);
/* Metric is currently based on the best-path only */
metric = info->attr->med;
for (mpinfo = info; mpinfo; mpinfo = bgp_info_mpath_next(mpinfo)) {
if (valid_nh_count >= multipath_num)
break;
*mpinfo_cp = *mpinfo;
/* Get nexthop address-family */
if (p->family == AF_INET
&& !BGP_ATTR_NEXTHOP_AFI_IP6(mpinfo_cp->attr))
nh_family = AF_INET;
else if (p->family == AF_INET6
|| (p->family == AF_INET
&& BGP_ATTR_NEXTHOP_AFI_IP6(mpinfo_cp->attr)))
nh_family = AF_INET6;
else
continue;
if (nh_family == AF_INET) {
struct in_addr *nexthop;
if (bgp->table_map[afi][safi].name) {
/* Copy info and attributes, so the route-map
apply doesn't modify the BGP route info. */
local_attr = *mpinfo->attr;
mpinfo_cp->attr = &local_attr;
if (!bgp_table_map_apply(
bgp->table_map[afi][safi].map, p,
mpinfo_cp))
continue;
/* metric/tag is only allowed to be
* overridden on 1st nexthop */
if (mpinfo == info) {
metric = mpinfo_cp->attr->med;
tag = mpinfo_cp->attr->tag;
}
}
nexthop = &mpinfo_cp->attr->nexthop;
api_nh = &api.nexthops[valid_nh_count];
api_nh->gate.ipv4 = *nexthop;
/* EVPN type-2 routes are
programmed as onlink on l3-vni SVI
*/
if (CHECK_FLAG(api.flags, ZEBRA_FLAG_EVPN_ROUTE))
api_nh->type = NEXTHOP_TYPE_IPV4_IFINDEX;
else
api_nh->type = NEXTHOP_TYPE_IPV4;
} else {
ifindex_t ifindex;
struct in6_addr *nexthop;
ifindex = 0;
if (bgp->table_map[afi][safi].name) {
/* Copy info and attributes, so the route-map
apply doesn't modify the BGP route info. */
local_attr = *mpinfo->attr;
mpinfo_cp->attr = &local_attr;
if (!bgp_table_map_apply(
bgp->table_map[afi][safi].map, p,
mpinfo_cp))
continue;
/* metric/tag is only allowed to be
* overridden on 1st nexthop */
if (mpinfo == info) {
metric = mpinfo_cp->attr->med;
tag = mpinfo_cp->attr->tag;
}
}
nexthop = bgp_info_to_ipv6_nexthop(mpinfo_cp);
if ((mpinfo == info)
&& mpinfo->attr->mp_nexthop_len
== BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL)
if (mpinfo->peer->nexthop.ifp)
ifindex = mpinfo->peer->nexthop.ifp
->ifindex;
if (!ifindex) {
if (mpinfo->peer->conf_if)
ifindex = mpinfo->peer->ifp->ifindex;
else if (mpinfo->peer->ifname)
ifindex = ifname2ifindex(
mpinfo->peer->ifname,
bgp->vrf_id);
else if (mpinfo->peer->nexthop.ifp)
ifindex = mpinfo->peer->nexthop.ifp
->ifindex;
}
if (ifindex == 0)
continue;
api_nh = &api.nexthops[valid_nh_count];
api_nh->gate.ipv6 = *nexthop;
api_nh->ifindex = ifindex;
api_nh->type = NEXTHOP_TYPE_IPV6_IFINDEX;
}
if (mpinfo->extra && bgp_is_valid_label(&mpinfo->extra->label)
&& !CHECK_FLAG(api.flags, ZEBRA_FLAG_EVPN_ROUTE)) {
has_valid_label = 1;
label = label_pton(&mpinfo->extra->label);
api_nh->label_num = 1;
api_nh->labels[0] = label;
}
valid_nh_count++;
}
/* if this is a evpn route we don't have to include the label */
if (has_valid_label &&
!(CHECK_FLAG(api.flags, ZEBRA_FLAG_EVPN_ROUTE)))
SET_FLAG(api.message, ZAPI_MESSAGE_LABEL);
if (info->sub_type != BGP_ROUTE_AGGREGATE)
api.nexthop_num = valid_nh_count;
SET_FLAG(api.message, ZAPI_MESSAGE_METRIC);
api.metric = metric;
if (tag) {
SET_FLAG(api.message, ZAPI_MESSAGE_TAG);
api.tag = tag;
}
distance = bgp_distance_apply(p, info, afi, safi, bgp);
if (distance) {
SET_FLAG(api.message, ZAPI_MESSAGE_DISTANCE);
api.distance = distance;
}
if (bgp_debug_zebra(p)) {
char prefix_buf[PREFIX_STRLEN];
char nh_buf[INET6_ADDRSTRLEN];
char label_buf[20];
int i;
prefix2str(&api.prefix, prefix_buf, sizeof(prefix_buf));
zlog_debug("Tx route %s VRF %u %s metric %u tag %" ROUTE_TAG_PRI
" count %d",
valid_nh_count ? "add" : "delete", bgp->vrf_id,
prefix_buf, api.metric, api.tag, api.nexthop_num);
for (i = 0; i < api.nexthop_num; i++) {
api_nh = &api.nexthops[i];
if (api_nh->type == NEXTHOP_TYPE_IPV4)
nh_family = AF_INET;
else
nh_family = AF_INET6;
inet_ntop(nh_family, &api_nh->gate, nh_buf,
sizeof(nh_buf));
label_buf[0] = '\0';
if (has_valid_label &&
!CHECK_FLAG(api.flags, ZEBRA_FLAG_EVPN_ROUTE))
sprintf(label_buf, "label %u",
api_nh->labels[0]);
zlog_debug(" nhop [%d]: %s %s", i + 1, nh_buf,
label_buf);
}
}
zclient_route_send(valid_nh_count ? ZEBRA_ROUTE_ADD
: ZEBRA_ROUTE_DELETE,
zclient, &api);
}
/* Announce all routes of a table to zebra */
void bgp_zebra_announce_table(struct bgp *bgp, afi_t afi, safi_t safi)
{
struct bgp_node *rn;
struct bgp_table *table;
struct bgp_info *ri;
/* Don't try to install if we're not connected to Zebra or Zebra doesn't
* know of this instance.
*/
if (!bgp_install_info_to_zebra(bgp))
return;
table = bgp->rib[afi][safi];
if (!table)
return;
for (rn = bgp_table_top(table); rn; rn = bgp_route_next(rn))
for (ri = rn->info; ri; ri = ri->next)
if (CHECK_FLAG(ri->flags, BGP_INFO_SELECTED)
&& ri->type == ZEBRA_ROUTE_BGP
&& ri->sub_type == BGP_ROUTE_NORMAL)
bgp_zebra_announce(rn, &rn->p, ri, bgp, afi,
safi);
}
void bgp_zebra_withdraw(struct prefix *p, struct bgp_info *info, safi_t safi)
{
struct zapi_route api;
struct peer *peer;
peer = info->peer;
assert(peer);
/* Don't try to install if we're not connected to Zebra or Zebra doesn't
* know of this instance.
*/
if (!bgp_install_info_to_zebra(peer->bgp))
return;
memset(&api, 0, sizeof(api));
memcpy(&api.rmac, &(info->attr->rmac), sizeof(struct ethaddr));
api.vrf_id = peer->bgp->vrf_id;
api.nh_vrf_id = peer->bgp->vrf_id;
api.type = ZEBRA_ROUTE_BGP;
api.safi = safi;
api.prefix = *p;
/* If it is an EVPN route mark as such.
* Currently presence of rmac in attr denotes
* this is an EVPN type-2 route
*/
if (!is_zero_mac(&(info->attr->rmac)))
SET_FLAG(api.flags, ZEBRA_FLAG_EVPN_ROUTE);
if (peer->sort == BGP_PEER_IBGP) {
SET_FLAG(api.flags, ZEBRA_FLAG_INTERNAL);
SET_FLAG(api.flags, ZEBRA_FLAG_IBGP);
}
if ((peer->sort == BGP_PEER_EBGP && peer->ttl != 1)
|| CHECK_FLAG(peer->flags, PEER_FLAG_DISABLE_CONNECTED_CHECK)
|| bgp_flag_check(peer->bgp, BGP_FLAG_DISABLE_NH_CONNECTED_CHK))
SET_FLAG(api.flags, ZEBRA_FLAG_INTERNAL);
if (bgp_debug_zebra(p)) {
char buf[PREFIX_STRLEN];
prefix2str(&api.prefix, buf, sizeof(buf));
zlog_debug("Tx route delete VRF %u %s", peer->bgp->vrf_id, buf);
}
zclient_route_send(ZEBRA_ROUTE_DELETE, zclient, &api);
}
struct bgp_redist *bgp_redist_lookup(struct bgp *bgp, afi_t afi, u_char type,
u_short instance)
{
struct list *red_list;
struct listnode *node;
struct bgp_redist *red;
red_list = bgp->redist[afi][type];
if (!red_list)
return (NULL);
for (ALL_LIST_ELEMENTS_RO(red_list, node, red))
if (red->instance == instance)
return red;
return NULL;
}
struct bgp_redist *bgp_redist_add(struct bgp *bgp, afi_t afi, u_char type,
u_short instance)
{
struct list *red_list;
struct bgp_redist *red;
red = bgp_redist_lookup(bgp, afi, type, instance);
if (red)
return red;
if (!bgp->redist[afi][type])
bgp->redist[afi][type] = list_new();
red_list = bgp->redist[afi][type];
red = (struct bgp_redist *)XCALLOC(MTYPE_BGP_REDIST,
sizeof(struct bgp_redist));
red->instance = instance;
listnode_add(red_list, red);
return red;
}
static void bgp_redist_del(struct bgp *bgp, afi_t afi, u_char type,
u_short instance)
{
struct bgp_redist *red;
red = bgp_redist_lookup(bgp, afi, type, instance);
if (red) {
listnode_delete(bgp->redist[afi][type], red);
XFREE(MTYPE_BGP_REDIST, red);
if (!bgp->redist[afi][type]->count)
list_delete_and_null(&bgp->redist[afi][type]);
}
}
/* Other routes redistribution into BGP. */
int bgp_redistribute_set(struct bgp *bgp, afi_t afi, int type, u_short instance)
{
/* Return if already redistribute flag is set. */
if (instance) {
if (redist_check_instance(&zclient->mi_redist[afi][type],
instance))
return CMD_WARNING;
redist_add_instance(&zclient->mi_redist[afi][type], instance);
} else {
if (vrf_bitmap_check(zclient->redist[afi][type], bgp->vrf_id))
return CMD_WARNING;
#if ENABLE_BGP_VNC
if (bgp->vrf_id == VRF_DEFAULT
&& type == ZEBRA_ROUTE_VNC_DIRECT) {
vnc_export_bgp_enable(
bgp, afi); /* only enables if mode bits cfg'd */
}
#endif
vrf_bitmap_set(zclient->redist[afi][type], bgp->vrf_id);
}
/*
* Don't try to register if we're not connected to Zebra or Zebra
* doesn't know of this instance.
*
* When we come up later well resend if needed.
*/
if (!bgp_install_info_to_zebra(bgp))
return CMD_SUCCESS;
if (BGP_DEBUG(zebra, ZEBRA))
zlog_debug("Tx redistribute add VRF %u afi %d %s %d",
bgp->vrf_id, afi, zebra_route_string(type),
instance);
/* Send distribute add message to zebra. */
zebra_redistribute_send(ZEBRA_REDISTRIBUTE_ADD, zclient, afi, type,
instance, bgp->vrf_id);
return CMD_SUCCESS;
}
int bgp_redistribute_resend(struct bgp *bgp, afi_t afi, int type,
u_short instance)
{
/* Don't try to send if we're not connected to Zebra or Zebra doesn't
* know of this instance.
*/
if (!bgp_install_info_to_zebra(bgp))
return -1;
if (BGP_DEBUG(zebra, ZEBRA))
zlog_debug("Tx redistribute del/add VRF %u afi %d %s %d",
bgp->vrf_id, afi, zebra_route_string(type),
instance);
/* Send distribute add message to zebra. */
zebra_redistribute_send(ZEBRA_REDISTRIBUTE_DELETE, zclient, afi, type,
instance, bgp->vrf_id);
zebra_redistribute_send(ZEBRA_REDISTRIBUTE_ADD, zclient, afi, type,
instance, bgp->vrf_id);
return 0;
}
/* Redistribute with route-map specification. */
int bgp_redistribute_rmap_set(struct bgp_redist *red, const char *name)
{
if (red->rmap.name && (strcmp(red->rmap.name, name) == 0))
return 0;
if (red->rmap.name)
XFREE(MTYPE_ROUTE_MAP_NAME, red->rmap.name);
red->rmap.name = XSTRDUP(MTYPE_ROUTE_MAP_NAME, name);
red->rmap.map = route_map_lookup_by_name(name);
return 1;
}
/* Redistribute with metric specification. */
int bgp_redistribute_metric_set(struct bgp *bgp, struct bgp_redist *red,
afi_t afi, int type, u_int32_t metric)
{
struct bgp_node *rn;
struct bgp_info *ri;
if (red->redist_metric_flag && red->redist_metric == metric)
return 0;
red->redist_metric_flag = 1;
red->redist_metric = metric;
for (rn = bgp_table_top(bgp->rib[afi][SAFI_UNICAST]); rn;
rn = bgp_route_next(rn)) {
for (ri = rn->info; ri; ri = ri->next) {
if (ri->sub_type == BGP_ROUTE_REDISTRIBUTE
&& ri->type == type
&& ri->instance == red->instance) {
struct attr *old_attr;
struct attr new_attr;
bgp_attr_dup(&new_attr, ri->attr);
new_attr.med = red->redist_metric;
old_attr = ri->attr;
ri->attr = bgp_attr_intern(&new_attr);
bgp_attr_unintern(&old_attr);
bgp_info_set_flag(rn, ri,
BGP_INFO_ATTR_CHANGED);
bgp_process(bgp, rn, afi, SAFI_UNICAST);
}
}
}
return 1;
}
/* Unset redistribution. */
int bgp_redistribute_unreg(struct bgp *bgp, afi_t afi, int type,
u_short instance)
{
struct bgp_redist *red;
red = bgp_redist_lookup(bgp, afi, type, instance);
if (!red)
return CMD_SUCCESS;
/* Return if zebra connection is disabled. */
if (instance) {
if (!redist_check_instance(&zclient->mi_redist[afi][type],
instance))
return CMD_WARNING;
redist_del_instance(&zclient->mi_redist[afi][type], instance);
} else {
if (!vrf_bitmap_check(zclient->redist[afi][type], bgp->vrf_id))
return CMD_WARNING;
vrf_bitmap_unset(zclient->redist[afi][type], bgp->vrf_id);
}
#if ENABLE_BGP_VNC
if (bgp->vrf_id == VRF_DEFAULT && type == ZEBRA_ROUTE_VNC_DIRECT) {
vnc_export_bgp_disable(bgp, afi);
}
#endif
if (bgp_install_info_to_zebra(bgp)) {
/* Send distribute delete message to zebra. */
if (BGP_DEBUG(zebra, ZEBRA))
zlog_debug("Tx redistribute del VRF %u afi %d %s %d",
bgp->vrf_id, afi, zebra_route_string(type),
instance);
zebra_redistribute_send(ZEBRA_REDISTRIBUTE_DELETE, zclient, afi,
type, instance, bgp->vrf_id);
}
/* Withdraw redistributed routes from current BGP's routing table. */
bgp_redistribute_withdraw(bgp, afi, type, instance);
return CMD_SUCCESS;
}
/* Unset redistribution. */
int bgp_redistribute_unset(struct bgp *bgp, afi_t afi, int type,
u_short instance)
{
struct bgp_redist *red;
red = bgp_redist_lookup(bgp, afi, type, instance);
if (!red)
return CMD_SUCCESS;
bgp_redistribute_unreg(bgp, afi, type, instance);
/* Unset route-map. */
if (red->rmap.name)
XFREE(MTYPE_ROUTE_MAP_NAME, red->rmap.name);
red->rmap.name = NULL;
red->rmap.map = NULL;
/* Unset metric. */
red->redist_metric_flag = 0;
red->redist_metric = 0;
bgp_redist_del(bgp, afi, type, instance);
return CMD_SUCCESS;
}
/* Update redistribute vrf bitmap during triggers like
restart networking or delete/add VRFs */
void bgp_update_redist_vrf_bitmaps(struct bgp *bgp, vrf_id_t old_vrf_id)
{
int i;
afi_t afi;
for (afi = AFI_IP; afi < AFI_MAX; afi++)
for (i = 0; i < ZEBRA_ROUTE_MAX; i++)
if ((old_vrf_id == VRF_UNKNOWN)
|| vrf_bitmap_check(zclient->redist[afi][i],
old_vrf_id)) {
vrf_bitmap_unset(zclient->redist[afi][i],
old_vrf_id);
vrf_bitmap_set(zclient->redist[afi][i],
bgp->vrf_id);
}
return;
}
void bgp_zclient_reset(void)
{
zclient_reset(zclient);
}
/* Register this instance with Zebra. Invoked upon connect (for
* default instance) and when other VRFs are learnt (or created and
* already learnt).
*/
void bgp_zebra_instance_register(struct bgp *bgp)
{
/* Don't try to register if we're not connected to Zebra */
if (!zclient || zclient->sock < 0)
return;
if (BGP_DEBUG(zebra, ZEBRA))
zlog_debug("Registering VRF %u", bgp->vrf_id);
/* Register for router-id, interfaces, redistributed routes. */
zclient_send_reg_requests(zclient, bgp->vrf_id);
/* For default instance, register to learn about VNIs, if appropriate.
*/
if (bgp->inst_type == BGP_INSTANCE_TYPE_DEFAULT
&& is_evpn_enabled())
bgp_zebra_advertise_all_vni(bgp, 1);
}
/* Deregister this instance with Zebra. Invoked upon the instance
* being deleted (default or VRF) and it is already registered.
*/
void bgp_zebra_instance_deregister(struct bgp *bgp)
{
/* Don't try to deregister if we're not connected to Zebra */
if (zclient->sock < 0)
return;
if (BGP_DEBUG(zebra, ZEBRA))
zlog_debug("Deregistering VRF %u", bgp->vrf_id);
/* For default instance, unregister learning about VNIs, if appropriate.
*/
if (bgp->inst_type == BGP_INSTANCE_TYPE_DEFAULT
&& is_evpn_enabled())
bgp_zebra_advertise_all_vni(bgp, 0);
/* Deregister for router-id, interfaces, redistributed routes. */
zclient_send_dereg_requests(zclient, bgp->vrf_id);
}
void bgp_zebra_initiate_radv(struct bgp *bgp, struct peer *peer)
{
int ra_interval = BGP_UNNUM_DEFAULT_RA_INTERVAL;
/* Don't try to initiate if we're not connected to Zebra */
if (zclient->sock < 0)
return;
if (BGP_DEBUG(zebra, ZEBRA))
zlog_debug("%u: Initiating RA for peer %s", bgp->vrf_id,
peer->host);
zclient_send_interface_radv_req(zclient, bgp->vrf_id, peer->ifp, 1,
ra_interval);
}
void bgp_zebra_terminate_radv(struct bgp *bgp, struct peer *peer)
{
/* Don't try to terminate if we're not connected to Zebra */
if (zclient->sock < 0)
return;
if (BGP_DEBUG(zebra, ZEBRA))
zlog_debug("%u: Terminating RA for peer %s", bgp->vrf_id,
peer->host);
zclient_send_interface_radv_req(zclient, bgp->vrf_id, peer->ifp, 0, 0);
}
int bgp_zebra_advertise_gw_macip(struct bgp *bgp, int advertise, vni_t vni)
{
struct stream *s = NULL;
/* Check socket. */
if (!zclient || zclient->sock < 0)
return 0;
/* Don't try to register if Zebra doesn't know of this instance. */
if (!IS_BGP_INST_KNOWN_TO_ZEBRA(bgp))
return 0;
s = zclient->obuf;
stream_reset(s);
zclient_create_header(s, ZEBRA_ADVERTISE_DEFAULT_GW, bgp->vrf_id);
stream_putc(s, advertise);
stream_put3(s, vni);
stream_putw_at(s, 0, stream_get_endp(s));
return zclient_send_message(zclient);
}
int bgp_zebra_advertise_all_vni(struct bgp *bgp, int advertise)
{
struct stream *s;
/* Check socket. */
if (!zclient || zclient->sock < 0)
return 0;
/* Don't try to register if Zebra doesn't know of this instance. */
if (!IS_BGP_INST_KNOWN_TO_ZEBRA(bgp))
return 0;
s = zclient->obuf;
stream_reset(s);
zclient_create_header(s, ZEBRA_ADVERTISE_ALL_VNI, bgp->vrf_id);
stream_putc(s, advertise);
stream_putw_at(s, 0, stream_get_endp(s));
return zclient_send_message(zclient);
}
/* BGP has established connection with Zebra. */
static void bgp_zebra_connected(struct zclient *zclient)
{
struct bgp *bgp;
zclient_num_connects++; /* increment even if not responding */
/* At this point, we may or may not have BGP instances configured, but
* we're only interested in the default VRF (others wouldn't have learnt
* the VRF from Zebra yet.)
*/
bgp = bgp_get_default();
if (!bgp)
return;
bgp_zebra_instance_register(bgp);
/* Send the client registration */
bfd_client_sendmsg(zclient, ZEBRA_BFD_CLIENT_REGISTER);
/* TODO - What if we have peers and networks configured, do we have to
* kick-start them?
*/
}
static int bgp_zebra_process_local_l3vni(int cmd, struct zclient *zclient,
zebra_size_t length, vrf_id_t vrf_id)
{
char buf[ETHER_ADDR_STRLEN];
vni_t l3vni = 0;
struct ethaddr rmac;
struct in_addr originator_ip;
struct stream *s;
memset(&rmac, 0, sizeof(struct ethaddr));
memset(&originator_ip, 0, sizeof(struct in_addr));
s = zclient->ibuf;
l3vni = stream_getl(s);
if (cmd == ZEBRA_L3VNI_ADD) {
stream_get(&rmac, s, sizeof(struct ethaddr));
originator_ip.s_addr = stream_get_ipv4(s);
}
if (BGP_DEBUG(zebra, ZEBRA))
zlog_debug("Rx L3-VNI %s VRF %s VNI %u RMAC %s",
(cmd == ZEBRA_L3VNI_ADD) ? "add" : "del",
vrf_id_to_name(vrf_id),
l3vni,
prefix_mac2str(&rmac, buf, sizeof(buf)));
if (cmd == ZEBRA_L3VNI_ADD)
bgp_evpn_local_l3vni_add(l3vni, vrf_id, &rmac, originator_ip);
else
bgp_evpn_local_l3vni_del(l3vni, vrf_id);
return 0;
}
static int bgp_zebra_process_local_vni(int command, struct zclient *zclient,
zebra_size_t length, vrf_id_t vrf_id)
{
struct stream *s;
vni_t vni;
struct bgp *bgp;
struct in_addr vtep_ip;
vrf_id_t tenant_vrf_id = VRF_DEFAULT;
s = zclient->ibuf;
vni = stream_getl(s);
if (command == ZEBRA_VNI_ADD) {
vtep_ip.s_addr = stream_get_ipv4(s);
stream_get(&tenant_vrf_id, s, sizeof(vrf_id_t));
}
bgp = bgp_lookup_by_vrf_id(vrf_id);
if (!bgp)
return 0;
if (BGP_DEBUG(zebra, ZEBRA))
zlog_debug("Rx VNI %s VRF %s VNI %u tenant-vrf %s",
(command == ZEBRA_VNI_ADD) ? "add" : "del",
vrf_id_to_name(vrf_id),
vni, vrf_id_to_name(tenant_vrf_id));
if (command == ZEBRA_VNI_ADD)
return bgp_evpn_local_vni_add(
bgp, vni, vtep_ip.s_addr ? vtep_ip : bgp->router_id,
tenant_vrf_id);
else
return bgp_evpn_local_vni_del(bgp, vni);
}
static int bgp_zebra_process_local_macip(int command, struct zclient *zclient,
zebra_size_t length, vrf_id_t vrf_id)
{
struct stream *s;
vni_t vni;
struct bgp *bgp;
struct ethaddr mac;
struct ipaddr ip;
int ipa_len;
char buf[ETHER_ADDR_STRLEN];
char buf1[INET6_ADDRSTRLEN];
u_char flags;
memset(&ip, 0, sizeof(ip));
s = zclient->ibuf;
vni = stream_getl(s);
stream_get(&mac.octet, s, ETH_ALEN);
ipa_len = stream_getl(s);
if (ipa_len != 0 && ipa_len != IPV4_MAX_BYTELEN
&& ipa_len != IPV6_MAX_BYTELEN) {
zlog_err("%u:Recv MACIP %s with invalid IP addr length %d",
vrf_id, (command == ZEBRA_MACIP_ADD) ? "Add" : "Del",
ipa_len);
return -1;
}
if (ipa_len) {
ip.ipa_type =
(ipa_len == IPV4_MAX_BYTELEN) ? IPADDR_V4 : IPADDR_V6;
stream_get(&ip.ip.addr, s, ipa_len);
}
flags = stream_getc(s);
bgp = bgp_lookup_by_vrf_id(vrf_id);
if (!bgp)
return 0;
if (BGP_DEBUG(zebra, ZEBRA))
zlog_debug("%u:Recv MACIP %s flags 0x%x MAC %s IP %s VNI %u",
vrf_id, (command == ZEBRA_MACIP_ADD) ? "Add" : "Del",
flags, prefix_mac2str(&mac, buf, sizeof(buf)),
ipaddr2str(&ip, buf1, sizeof(buf1)), vni);
if (command == ZEBRA_MACIP_ADD)
return bgp_evpn_local_macip_add(bgp, vni, &mac, &ip, flags);
else
return bgp_evpn_local_macip_del(bgp, vni, &mac, &ip);
}
extern struct zebra_privs_t bgpd_privs;
void bgp_zebra_init(struct thread_master *master)
{
zclient_num_connects = 0;
/* Set default values. */
zclient = zclient_new_notify(master, &zclient_options_default);
zclient_init(zclient, ZEBRA_ROUTE_BGP, 0, &bgpd_privs);
zclient->zebra_connected = bgp_zebra_connected;
zclient->router_id_update = bgp_router_id_update;
zclient->interface_add = bgp_interface_add;
zclient->interface_delete = bgp_interface_delete;
zclient->interface_address_add = bgp_interface_address_add;
zclient->interface_address_delete = bgp_interface_address_delete;
zclient->interface_nbr_address_add = bgp_interface_nbr_address_add;
zclient->interface_nbr_address_delete =
bgp_interface_nbr_address_delete;
zclient->interface_vrf_update = bgp_interface_vrf_update;
zclient->redistribute_route_add = zebra_read_route;
zclient->redistribute_route_del = zebra_read_route;
zclient->interface_up = bgp_interface_up;
zclient->interface_down = bgp_interface_down;
zclient->nexthop_update = bgp_read_nexthop_update;
zclient->import_check_update = bgp_read_import_check_update;
zclient->fec_update = bgp_read_fec_update;
zclient->local_vni_add = bgp_zebra_process_local_vni;
zclient->local_vni_del = bgp_zebra_process_local_vni;
zclient->local_macip_add = bgp_zebra_process_local_macip;
zclient->local_macip_del = bgp_zebra_process_local_macip;
zclient->local_l3vni_add = bgp_zebra_process_local_l3vni;
zclient->local_l3vni_del = bgp_zebra_process_local_l3vni;
}
void bgp_zebra_destroy(void)
{
if (zclient == NULL)
return;
zclient_stop(zclient);
zclient_free(zclient);
zclient = NULL;
}
int bgp_zebra_num_connects(void)
{
return zclient_num_connects;
}
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