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/*
* Copyright (C) 2016 by Open Source Routing.
*
* 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 GNU Zebra; see the file COPYING. If not, write to the Free
* Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
*/
#include <zebra.h>
#include "prefix.h"
#include "stream.h"
#include "memory.h"
#include "zclient.h"
#include "command.h"
#include "network.h"
#include "linklist.h"
#include "mpls.h"
#include "ldpd.h"
#include "ldpe.h"
#include "lde.h"
#include "log.h"
#include "ldp_debug.h"
static void ifp2kif(struct interface *, struct kif *);
static void ifc2kaddr(struct interface *, struct connected *,
struct kaddr *);
static int zebra_send_mpls_labels(int, struct kroute *);
static int ldp_router_id_update(int, struct zclient *, zebra_size_t,
vrf_id_t);
static int ldp_interface_add(int, struct zclient *, zebra_size_t,
vrf_id_t);
static int ldp_interface_delete(int, struct zclient *, zebra_size_t,
vrf_id_t);
static int ldp_interface_status_change(int command, struct zclient *,
zebra_size_t, vrf_id_t);
static int ldp_interface_address_add(int, struct zclient *, zebra_size_t,
vrf_id_t);
static int ldp_interface_address_delete(int, struct zclient *,
zebra_size_t, vrf_id_t);
static int ldp_zebra_read_route(int, struct zclient *, zebra_size_t,
vrf_id_t);
static void ldp_zebra_connected(struct zclient *);
static struct zclient *zclient;
static void
ifp2kif(struct interface *ifp, struct kif *kif)
{
memset(kif, 0, sizeof(*kif));
strlcpy(kif->ifname, ifp->name, sizeof(kif->ifname));
kif->ifindex = ifp->ifindex;
kif->flags = ifp->flags;
if (ifp->ll_type == ZEBRA_LLT_ETHER)
memcpy(kif->mac, ifp->hw_addr, ETHER_ADDR_LEN);
}
static void
ifc2kaddr(struct interface *ifp, struct connected *ifc, struct kaddr *ka)
{
memset(ka, 0, sizeof(*ka));
ka->ifindex = ifp->ifindex;
ka->af = ifc->address->family;
ka->prefixlen = ifc->address->prefixlen;
switch (ka->af) {
case AF_INET:
ka->addr.v4 = ifc->address->u.prefix4;
if (ifc->destination)
ka->dstbrd.v4 = ifc->destination->u.prefix4;
break;
case AF_INET6:
ka->addr.v6 = ifc->address->u.prefix6;
if (ifc->destination)
ka->dstbrd.v6 = ifc->destination->u.prefix6;
break;
default:
break;
}
}
static int
zebra_send_mpls_labels(int cmd, struct kroute *kr)
{
struct stream *s;
if (kr->local_label < MPLS_LABEL_RESERVED_MAX ||
kr->remote_label == NO_LABEL)
return (0);
debug_zebra_out("prefix %s/%u nexthop %s ifindex %u labels %s/%s (%s)",
log_addr(kr->af, &kr->prefix), kr->prefixlen,
log_addr(kr->af, &kr->nexthop), kr->ifindex,
log_label(kr->local_label), log_label(kr->remote_label),
(cmd == ZEBRA_MPLS_LABELS_ADD) ? "add" : "delete");
/* Reset stream. */
s = zclient->obuf;
stream_reset(s);
zclient_create_header(s, cmd, VRF_DEFAULT);
stream_putc(s, ZEBRA_LSP_LDP);
stream_putl(s, kr->af);
switch (kr->af) {
case AF_INET:
stream_put_in_addr(s, &kr->prefix.v4);
stream_putc(s, kr->prefixlen);
stream_put_in_addr(s, &kr->nexthop.v4);
break;
case AF_INET6:
stream_write(s, (u_char *)&kr->prefix.v6, 16);
stream_putc(s, kr->prefixlen);
stream_write(s, (u_char *)&kr->nexthop.v6, 16);
break;
default:
fatalx("kr_change: unknown af");
}
stream_putl(s, kr->ifindex);
stream_putc(s, kr->priority);
stream_putl(s, kr->local_label);
stream_putl(s, kr->remote_label);
/* Put length at the first point of the stream. */
stream_putw_at(s, 0, stream_get_endp(s));
return (zclient_send_message(zclient));
}
int
kr_change(struct kroute *kr)
{
return (zebra_send_mpls_labels(ZEBRA_MPLS_LABELS_ADD, kr));
}
int
kr_delete(struct kroute *kr)
{
return (zebra_send_mpls_labels(ZEBRA_MPLS_LABELS_DELETE, kr));
}
int
kmpw_set(struct kpw *kpw)
{
/* TODO */
return (0);
}
int
kmpw_unset(struct kpw *kpw)
{
/* TODO */
return (0);
}
void
kif_redistribute(const char *ifname)
{
struct listnode *node, *cnode;
struct interface *ifp;
struct connected *ifc;
struct kif kif;
struct kaddr ka;
for (ALL_LIST_ELEMENTS_RO(vrf_iflist(VRF_DEFAULT), node, ifp)) {
if (ifname && strcmp(ifname, ifp->name) != 0)
continue;
ifp2kif(ifp, &kif);
main_imsg_compose_ldpe(IMSG_IFSTATUS, 0, &kif, sizeof(kif));
for (ALL_LIST_ELEMENTS_RO(ifp->connected, cnode, ifc)) {
ifc2kaddr(ifp, ifc, &ka);
main_imsg_compose_ldpe(IMSG_NEWADDR, 0, &ka,
sizeof(ka));
}
}
}
static int
ldp_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 (bad_addr_v4(router_id.u.prefix4))
return (0);
debug_zebra_in("router-id update %s", inet_ntoa(router_id.u.prefix4));
global.rtr_id.s_addr = router_id.u.prefix4.s_addr;
main_imsg_compose_ldpe(IMSG_RTRID_UPDATE, 0, &global.rtr_id,
sizeof(global.rtr_id));
return (0);
}
static int
ldp_interface_add(int command, struct zclient *zclient, zebra_size_t length,
vrf_id_t vrf_id)
{
struct interface *ifp;
struct kif kif;
ifp = zebra_interface_add_read(zclient->ibuf, vrf_id);
debug_zebra_in("interface add %s index %d mtu %d", ifp->name,
ifp->ifindex, ifp->mtu);
ifp2kif(ifp, &kif);
main_imsg_compose_ldpe(IMSG_IFSTATUS, 0, &kif, sizeof(kif));
return (0);
}
static int
ldp_interface_delete(int command, struct zclient *zclient, zebra_size_t length,
vrf_id_t vrf_id)
{
struct interface *ifp;
/* zebra_interface_state_read() updates interface structure in iflist */
ifp = zebra_interface_state_read(zclient->ibuf, vrf_id);
if (ifp == NULL)
return (0);
debug_zebra_in("interface delete %s index %d mtu %d", ifp->name,
ifp->ifindex, ifp->mtu);
/* To support pseudo interface do not free interface structure. */
/* if_delete(ifp); */
ifp->ifindex = IFINDEX_INTERNAL;
return (0);
}
static int
ldp_interface_status_change(int command, struct zclient *zclient,
zebra_size_t length, vrf_id_t vrf_id)
{
struct interface *ifp;
struct listnode *node;
struct connected *ifc;
struct kif kif;
struct kaddr ka;
int link_new;
/*
* zebra_interface_state_read() updates interface structure in
* iflist.
*/
ifp = zebra_interface_state_read(zclient->ibuf, vrf_id);
if (ifp == NULL)
return (0);
debug_zebra_in("interface %s state update", ifp->name);
ifp2kif(ifp, &kif);
main_imsg_compose_ldpe(IMSG_IFSTATUS, 0, &kif, sizeof(kif));
link_new = (ifp->flags & IFF_UP) && (ifp->flags & IFF_RUNNING);
if (link_new) {
for (ALL_LIST_ELEMENTS_RO(ifp->connected, node, ifc)) {
ifc2kaddr(ifp, ifc, &ka);
main_imsg_compose_ldpe(IMSG_NEWADDR, 0, &ka,
sizeof(ka));
}
} else {
for (ALL_LIST_ELEMENTS_RO(ifp->connected, node, ifc)) {
ifc2kaddr(ifp, ifc, &ka);
main_imsg_compose_ldpe(IMSG_DELADDR, 0, &ka,
sizeof(ka));
}
}
return (0);
}
static int
ldp_interface_address_add(int command, struct zclient *zclient,
zebra_size_t length, vrf_id_t vrf_id)
{
struct connected *ifc;
struct interface *ifp;
struct kaddr ka;
ifc = zebra_interface_address_read(command, zclient->ibuf, vrf_id);
if (ifc == NULL)
return (0);
ifp = ifc->ifp;
ifc2kaddr(ifp, ifc, &ka);
/* Filter invalid addresses. */
if (bad_addr(ka.af, &ka.addr))
return (0);
debug_zebra_in("address add %s/%u", log_addr(ka.af, &ka.addr),
ka.prefixlen);
/* notify ldpe about new address */
main_imsg_compose_ldpe(IMSG_NEWADDR, 0, &ka, sizeof(ka));
return (0);
}
static int
ldp_interface_address_delete(int command, struct zclient *zclient,
zebra_size_t length, vrf_id_t vrf_id)
{
struct connected *ifc;
struct interface *ifp;
struct kaddr ka;
ifc = zebra_interface_address_read(command, zclient->ibuf, vrf_id);
if (ifc == NULL)
return (0);
ifp = ifc->ifp;
ifc2kaddr(ifp, ifc, &ka);
connected_free(ifc);
/* Filter invalid addresses. */
if (bad_addr(ka.af, &ka.addr))
return (0);
debug_zebra_in("address delete %s/%u", log_addr(ka.af, &ka.addr),
ka.prefixlen);
/* notify ldpe about removed address */
main_imsg_compose_ldpe(IMSG_DELADDR, 0, &ka, sizeof(ka));
return (0);
}
static int
ldp_zebra_read_route(int command, struct zclient *zclient, zebra_size_t length,
vrf_id_t vrf_id)
{
struct stream *s;
u_char type;
u_char message_flags;
struct kroute kr;
int nhnum = 0, nhlen;
size_t nhmark;
memset(&kr, 0, sizeof(kr));
s = zclient->ibuf;
type = stream_getc(s);
switch (type) {
case ZEBRA_ROUTE_CONNECT:
kr.flags |= F_CONNECTED;
break;
case ZEBRA_ROUTE_BGP:
/* LDP should follow the IGP and ignore BGP routes */
return (0);
default:
break;
}
stream_getl(s); /* flags, unused */
stream_getw(s); /* instance, unused */
message_flags = stream_getc(s);
switch (command) {
case ZEBRA_REDISTRIBUTE_IPV4_ADD:
case ZEBRA_REDISTRIBUTE_IPV4_DEL:
kr.af = AF_INET;
nhlen = sizeof(struct in_addr);
break;
case ZEBRA_REDISTRIBUTE_IPV6_ADD:
case ZEBRA_REDISTRIBUTE_IPV6_DEL:
kr.af = AF_INET6;
nhlen = sizeof(struct in6_addr);
break;
default:
fatalx("ldp_zebra_read_route: unknown command");
}
kr.prefixlen = stream_getc(s);
stream_get(&kr.prefix, s, PSIZE(kr.prefixlen));
if (bad_addr(kr.af, &kr.prefix) ||
(kr.af == AF_INET6 && IN6_IS_SCOPE_EMBED(&kr.prefix.v6)))
return (0);
if (kr.af == AF_INET6 &&
CHECK_FLAG(message_flags, ZAPI_MESSAGE_SRCPFX)) {
uint8_t src_prefixlen;
src_prefixlen = stream_getc(s);
/* we completely ignore srcdest routes for now. */
if (src_prefixlen)
return (0);
}
if (CHECK_FLAG(message_flags, ZAPI_MESSAGE_NEXTHOP)) {
nhnum = stream_getc(s);
nhmark = stream_get_getp(s);
stream_set_getp(s, nhmark + nhnum * (nhlen + 5));
}
if (CHECK_FLAG(message_flags, ZAPI_MESSAGE_DISTANCE))
kr.priority = stream_getc(s);
if (CHECK_FLAG(message_flags, ZAPI_MESSAGE_METRIC))
stream_getl(s); /* metric, not used */
if (CHECK_FLAG(message_flags, ZAPI_MESSAGE_NEXTHOP))
stream_set_getp(s, nhmark);
if (nhnum == 0) {
switch (command) {
case ZEBRA_REDISTRIBUTE_IPV4_ADD:
case ZEBRA_REDISTRIBUTE_IPV6_ADD:
return (0);
case ZEBRA_REDISTRIBUTE_IPV4_DEL:
case ZEBRA_REDISTRIBUTE_IPV6_DEL:
debug_zebra_in("route delete %s/%d (%s)",
log_addr(kr.af, &kr.prefix), kr.prefixlen,
zebra_route_string(type));
break;
default:
fatalx("ldp_zebra_read_route: unknown command");
}
}
/* loop through all the nexthops */
for (; nhnum > 0; nhnum--) {
switch (kr.af) {
case AF_INET:
kr.nexthop.v4.s_addr = stream_get_ipv4(s);
break;
case AF_INET6:
stream_get(&kr.nexthop.v6, s, sizeof(kr.nexthop.v6));
break;
default:
break;
}
stream_getc(s); /* ifindex_num, unused. */
kr.ifindex = stream_getl(s);
switch (command) {
case ZEBRA_REDISTRIBUTE_IPV4_ADD:
case ZEBRA_REDISTRIBUTE_IPV6_ADD:
debug_zebra_in("route add %s/%d nexthop %s "
"ifindex %u (%s)", log_addr(kr.af, &kr.prefix),
kr.prefixlen, log_addr(kr.af, &kr.nexthop),
kr.ifindex, zebra_route_string(type));
main_imsg_compose_lde(IMSG_NETWORK_ADD, 0, &kr,
sizeof(kr));
break;
default:
break;
}
}
main_imsg_compose_lde(IMSG_NETWORK_UPDATE, 0, &kr, sizeof(kr));
return (0);
}
static void
ldp_zebra_connected(struct zclient *zclient)
{
zclient_send_reg_requests(zclient, VRF_DEFAULT);
zebra_redistribute_send(ZEBRA_REDISTRIBUTE_ADD, zclient, AFI_IP,
ZEBRA_ROUTE_ALL, 0, VRF_DEFAULT);
zebra_redistribute_send(ZEBRA_REDISTRIBUTE_ADD, zclient, AFI_IP6,
ZEBRA_ROUTE_ALL, 0, VRF_DEFAULT);
}
void
ldp_zebra_init(struct thread_master *master)
{
/* Set default values. */
zclient = zclient_new(master);
zclient_init(zclient, ZEBRA_ROUTE_LDP, 0);
/* set callbacks */
zclient->zebra_connected = ldp_zebra_connected;
zclient->router_id_update = ldp_router_id_update;
zclient->interface_add = ldp_interface_add;
zclient->interface_delete = ldp_interface_delete;
zclient->interface_up = ldp_interface_status_change;
zclient->interface_down = ldp_interface_status_change;
zclient->interface_address_add = ldp_interface_address_add;
zclient->interface_address_delete = ldp_interface_address_delete;
zclient->redistribute_route_ipv4_add = ldp_zebra_read_route;
zclient->redistribute_route_ipv4_del = ldp_zebra_read_route;
zclient->redistribute_route_ipv6_add = ldp_zebra_read_route;
zclient->redistribute_route_ipv6_del = ldp_zebra_read_route;
}
void
ldp_zebra_destroy(void)
{
zclient_stop(zclient);
zclient_free(zclient);
zclient = NULL;
}
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