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/* NHRP routing functions
* Copyright (c) 2014-2015 Timo Teräs
*
* This file is free software: you may copy, redistribute 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "nhrpd.h"
#include "table.h"
#include "memory.h"
#include "stream.h"
#include "log.h"
#include "zclient.h"
DEFINE_MTYPE_STATIC(NHRPD, NHRP_ROUTE, "NHRP routing entry")
static struct zclient *zclient;
static struct route_table *zebra_rib[AFI_MAX];
struct route_info {
union sockunion via;
struct interface *ifp;
struct interface *nhrp_ifp;
};
static struct route_node *nhrp_route_update_get(const struct prefix *p,
int create)
{
struct route_node *rn;
afi_t afi = family2afi(PREFIX_FAMILY(p));
if (!zebra_rib[afi])
return NULL;
if (create) {
rn = route_node_get(zebra_rib[afi], p);
if (!rn->info) {
rn->info = XCALLOC(MTYPE_NHRP_ROUTE,
sizeof(struct route_info));
route_lock_node(rn);
}
return rn;
} else {
return route_node_lookup(zebra_rib[afi], p);
}
}
static void nhrp_route_update_put(struct route_node *rn)
{
struct route_info *ri = rn->info;
if (!ri->ifp && !ri->nhrp_ifp
&& sockunion_family(&ri->via) == AF_UNSPEC) {
XFREE(MTYPE_NHRP_ROUTE, rn->info);
route_unlock_node(rn);
}
route_unlock_node(rn);
}
static void nhrp_route_update_zebra(const struct prefix *p,
union sockunion *nexthop,
struct interface *ifp)
{
struct route_node *rn;
struct route_info *ri;
rn = nhrp_route_update_get(
p, (sockunion_family(nexthop) != AF_UNSPEC) || ifp);
if (rn) {
ri = rn->info;
ri->via = *nexthop;
ri->ifp = ifp;
nhrp_route_update_put(rn);
}
}
void nhrp_route_update_nhrp(const struct prefix *p, struct interface *ifp)
{
struct route_node *rn;
struct route_info *ri;
rn = nhrp_route_update_get(p, ifp != NULL);
if (rn) {
ri = rn->info;
ri->nhrp_ifp = ifp;
nhrp_route_update_put(rn);
}
}
void nhrp_route_announce(int add, enum nhrp_cache_type type,
const struct prefix *p, struct interface *ifp,
const union sockunion *nexthop, uint32_t mtu)
{
struct zapi_route api;
struct zapi_nexthop *api_nh;
if (zclient->sock < 0)
return;
memset(&api, 0, sizeof(api));
api.type = ZEBRA_ROUTE_NHRP;
api.safi = SAFI_UNICAST;
api.vrf_id = VRF_DEFAULT;
api.prefix = *p;
switch (type) {
case NHRP_CACHE_NEGATIVE:
zapi_route_set_blackhole(&api, BLACKHOLE_REJECT);
ifp = NULL;
nexthop = NULL;
break;
case NHRP_CACHE_DYNAMIC:
case NHRP_CACHE_NHS:
case NHRP_CACHE_STATIC:
/* Regular route, so these are announced
* to other routing daemons */
break;
default:
SET_FLAG(api.flags, ZEBRA_FLAG_FIB_OVERRIDE);
break;
}
SET_FLAG(api.flags, ZEBRA_FLAG_ALLOW_RECURSION);
SET_FLAG(api.message, ZAPI_MESSAGE_NEXTHOP);
api.nexthop_num = 1;
api_nh = &api.nexthops[0];
api_nh->vrf_id = VRF_DEFAULT;
switch (api.prefix.family) {
case AF_INET:
if (nexthop) {
api_nh->gate.ipv4 = nexthop->sin.sin_addr;
api_nh->type = NEXTHOP_TYPE_IPV4;
}
if (ifp) {
api_nh->ifindex = ifp->ifindex;
if (api_nh->type == NEXTHOP_TYPE_IPV4)
api_nh->type = NEXTHOP_TYPE_IPV4_IFINDEX;
else
api_nh->type = NEXTHOP_TYPE_IFINDEX;
}
break;
case AF_INET6:
if (nexthop) {
api_nh->gate.ipv6 = nexthop->sin6.sin6_addr;
api_nh->type = NEXTHOP_TYPE_IPV6;
}
if (ifp) {
api_nh->ifindex = ifp->ifindex;
if (api_nh->type == NEXTHOP_TYPE_IPV6)
api_nh->type = NEXTHOP_TYPE_IPV6_IFINDEX;
else
api_nh->type = NEXTHOP_TYPE_IFINDEX;
}
break;
}
if (mtu) {
SET_FLAG(api.message, ZAPI_MESSAGE_MTU);
api.mtu = mtu;
}
if (unlikely(debug_flags & NHRP_DEBUG_ROUTE)) {
char buf[2][PREFIX_STRLEN];
prefix2str(&api.prefix, buf[0], sizeof(buf[0]));
zlog_debug(
"Zebra send: route %s %s nexthop %s metric %u"
" count %d dev %s",
add ? "add" : "del", buf[0],
nexthop ? inet_ntop(api.prefix.family, &api_nh->gate,
buf[1], sizeof(buf[1]))
: "<onlink>",
api.metric, api.nexthop_num, ifp ? ifp->name : "none");
}
zclient_route_send(add ? ZEBRA_ROUTE_ADD : ZEBRA_ROUTE_DELETE, zclient,
&api);
}
int nhrp_route_read(ZAPI_CALLBACK_ARGS)
{
struct zapi_route api;
struct zapi_nexthop *api_nh;
struct interface *ifp = NULL;
union sockunion nexthop_addr;
char buf[2][PREFIX_STRLEN];
int added;
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;
sockunion_family(&nexthop_addr) = AF_UNSPEC;
if (CHECK_FLAG(api.message, ZAPI_MESSAGE_NEXTHOP)) {
api_nh = &api.nexthops[0];
nexthop_addr.sa.sa_family = api.prefix.family;
switch (nexthop_addr.sa.sa_family) {
case AF_INET:
nexthop_addr.sin.sin_addr = api_nh->gate.ipv4;
break;
case AF_INET6:
nexthop_addr.sin6.sin6_addr = api_nh->gate.ipv6;
break;
}
if (api_nh->ifindex != IFINDEX_INTERNAL)
ifp = if_lookup_by_index(api_nh->ifindex, VRF_DEFAULT);
}
added = (cmd == ZEBRA_REDISTRIBUTE_ROUTE_ADD);
debugf(NHRP_DEBUG_ROUTE, "if-route-%s: %s via %s dev %s",
added ? "add" : "del",
prefix2str(&api.prefix, buf[0], sizeof buf[0]),
sockunion2str(&nexthop_addr, buf[1], sizeof buf[1]),
ifp ? ifp->name : "(none)");
nhrp_route_update_zebra(&api.prefix, &nexthop_addr, ifp);
nhrp_shortcut_prefix_change(&api.prefix, !added);
return 0;
}
int nhrp_route_get_nexthop(const union sockunion *addr, struct prefix *p,
union sockunion *via, struct interface **ifp)
{
struct route_node *rn;
struct route_info *ri;
struct prefix lookup;
afi_t afi = family2afi(sockunion_family(addr));
char buf[PREFIX_STRLEN];
sockunion2hostprefix(addr, &lookup);
rn = route_node_match(zebra_rib[afi], &lookup);
if (!rn)
return 0;
ri = rn->info;
if (ri->nhrp_ifp) {
debugf(NHRP_DEBUG_ROUTE, "lookup %s: nhrp_if=%s",
prefix2str(&lookup, buf, sizeof buf),
ri->nhrp_ifp->name);
if (via)
sockunion_family(via) = AF_UNSPEC;
if (ifp)
*ifp = ri->nhrp_ifp;
} else {
debugf(NHRP_DEBUG_ROUTE, "lookup %s: zebra route dev %s",
prefix2str(&lookup, buf, sizeof buf),
ri->ifp ? ri->ifp->name : "(none)");
if (via)
*via = ri->via;
if (ifp)
*ifp = ri->ifp;
}
if (p)
*p = rn->p;
route_unlock_node(rn);
return 1;
}
enum nhrp_route_type nhrp_route_address(struct interface *in_ifp,
union sockunion *addr, struct prefix *p,
struct nhrp_peer **peer)
{
struct interface *ifp = in_ifp;
struct nhrp_interface *nifp;
struct nhrp_cache *c;
union sockunion via[4];
uint32_t network_id = 0;
afi_t afi = family2afi(sockunion_family(addr));
int i;
if (ifp) {
nifp = ifp->info;
network_id = nifp->afi[afi].network_id;
c = nhrp_cache_get(ifp, addr, 0);
if (c && c->cur.type == NHRP_CACHE_LOCAL) {
if (p)
memset(p, 0, sizeof(*p));
return NHRP_ROUTE_LOCAL;
}
}
for (i = 0; i < 4; i++) {
if (!nhrp_route_get_nexthop(addr, p, &via[i], &ifp))
return NHRP_ROUTE_BLACKHOLE;
if (ifp) {
/* Departing from nbma network? */
nifp = ifp->info;
if (network_id
&& network_id != nifp->afi[afi].network_id)
return NHRP_ROUTE_OFF_NBMA;
}
if (sockunion_family(&via[i]) == AF_UNSPEC)
break;
/* Resolve via node, but return the prefix of first match */
addr = &via[i];
p = NULL;
}
if (ifp) {
c = nhrp_cache_get(ifp, addr, 0);
if (c && c->cur.type >= NHRP_CACHE_DYNAMIC) {
if (p)
memset(p, 0, sizeof(*p));
if (c->cur.type == NHRP_CACHE_LOCAL)
return NHRP_ROUTE_LOCAL;
if (peer)
*peer = nhrp_peer_ref(c->cur.peer);
return NHRP_ROUTE_NBMA_NEXTHOP;
}
}
return NHRP_ROUTE_BLACKHOLE;
}
static void nhrp_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 nhrp_zebra_init(void)
{
zebra_rib[AFI_IP] = route_table_init();
zebra_rib[AFI_IP6] = route_table_init();
zclient = zclient_new(master, &zclient_options_default);
zclient->zebra_connected = nhrp_zebra_connected;
zclient->interface_address_add = nhrp_interface_address_add;
zclient->interface_address_delete = nhrp_interface_address_delete;
zclient->redistribute_route_add = nhrp_route_read;
zclient->redistribute_route_del = nhrp_route_read;
zclient_init(zclient, ZEBRA_ROUTE_NHRP, 0, &nhrpd_privs);
}
void nhrp_zebra_terminate(void)
{
zclient_stop(zclient);
zclient_free(zclient);
route_table_finish(zebra_rib[AFI_IP]);
route_table_finish(zebra_rib[AFI_IP6]);
}
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