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/*
* Zebra connect code.
* Copyright (C) 2018 Cumulus Networks, Inc.
* Donald Sharp
*
* FRR 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.
*
* FRR 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 "network.h"
#include "prefix.h"
#include "routemap.h"
#include "table.h"
#include "stream.h"
#include "memory.h"
#include "zclient.h"
#include "filter.h"
#include "plist.h"
#include "log.h"
#include "nexthop.h"
#include "nexthop_group.h"
#include "pbr_nht.h"
#include "pbr_map.h"
#include "pbr_memory.h"
#include "pbr_zebra.h"
#include "pbr_debug.h"
#include "pbr_vrf.h"
DEFINE_MTYPE_STATIC(PBRD, PBR_INTERFACE, "PBR Interface");
/* Zebra structure to hold current status. */
struct zclient *zclient;
struct pbr_interface *pbr_if_new(struct interface *ifp)
{
struct pbr_interface *pbr_ifp;
assert(ifp);
assert(!ifp->info);
pbr_ifp = XCALLOC(MTYPE_PBR_INTERFACE, sizeof(*pbr_ifp));
ifp->info = pbr_ifp;
return pbr_ifp;
}
void pbr_if_del(struct interface *ifp)
{
XFREE(MTYPE_PBR_INTERFACE, ifp->info);
}
/* Inteface addition message from zebra. */
int pbr_ifp_create(struct interface *ifp)
{
DEBUGD(&pbr_dbg_zebra, "%s: %s", __func__, ifp->name);
if (!ifp->info)
pbr_if_new(ifp);
pbr_nht_interface_update(ifp);
/* Update nexthops tracked from a `set nexthop` command */
pbr_nht_nexthop_interface_update(ifp);
pbr_map_policy_interface_update(ifp, true);
return 0;
}
int pbr_ifp_destroy(struct interface *ifp)
{
DEBUGD(&pbr_dbg_zebra, "%s: %s", __func__, ifp->name);
pbr_map_policy_interface_update(ifp, false);
return 0;
}
static int interface_address_add(ZAPI_CALLBACK_ARGS)
{
struct connected *c;
char buf[PREFIX_STRLEN];
c = zebra_interface_address_read(cmd, zclient->ibuf, vrf_id);
DEBUGD(&pbr_dbg_zebra, "%s: %s added %s", __func__,
c ? c->ifp->name : "Unknown",
c ? prefix2str(c->address, buf, sizeof(buf)) : "Unknown");
return 0;
}
static int interface_address_delete(ZAPI_CALLBACK_ARGS)
{
struct connected *c;
c = zebra_interface_address_read(cmd, zclient->ibuf, vrf_id);
if (!c)
return 0;
DEBUGD(&pbr_dbg_zebra, "%s: %s deleted %pFX", __func__, c->ifp->name,
c->address);
connected_free(&c);
return 0;
}
int pbr_ifp_up(struct interface *ifp)
{
DEBUGD(&pbr_dbg_zebra, "%s: %s is up", __func__, ifp->name);
pbr_nht_nexthop_interface_update(ifp);
return 0;
}
int pbr_ifp_down(struct interface *ifp)
{
DEBUGD(&pbr_dbg_zebra, "%s: %s is down", __func__, ifp->name);
pbr_nht_nexthop_interface_update(ifp);
return 0;
}
static int interface_vrf_update(ZAPI_CALLBACK_ARGS)
{
struct interface *ifp;
vrf_id_t new_vrf_id;
ifp = zebra_interface_vrf_update_read(zclient->ibuf, vrf_id,
&new_vrf_id);
if (!ifp) {
DEBUGD(&pbr_dbg_zebra, "%s: VRF change interface not found",
__func__);
return 0;
}
DEBUGD(&pbr_dbg_zebra, "%s: %s VRF change %u -> %u", __func__,
ifp->name, vrf_id, new_vrf_id);
if_update_to_new_vrf(ifp, new_vrf_id);
return 0;
}
static int route_notify_owner(ZAPI_CALLBACK_ARGS)
{
struct prefix p;
enum zapi_route_notify_owner note;
uint32_t table_id;
if (!zapi_route_notify_decode(zclient->ibuf, &p, &table_id, ¬e,
NULL, NULL))
return -1;
switch (note) {
case ZAPI_ROUTE_FAIL_INSTALL:
DEBUGD(&pbr_dbg_zebra,
"%s: [%pFX] Route install failure for table: %u",
__func__, &p, table_id);
break;
case ZAPI_ROUTE_BETTER_ADMIN_WON:
DEBUGD(&pbr_dbg_zebra,
"%s: [%pFX] Route better admin distance won for table: %u",
__func__, &p, table_id);
break;
case ZAPI_ROUTE_INSTALLED:
DEBUGD(&pbr_dbg_zebra,
"%s: [%pFX] Route installed succeeded for table: %u",
__func__, &p, table_id);
pbr_nht_route_installed_for_table(table_id);
break;
case ZAPI_ROUTE_REMOVED:
DEBUGD(&pbr_dbg_zebra,
"%s: [%pFX] Route Removed succeeded for table: %u",
__func__, &p, table_id);
pbr_nht_route_removed_for_table(table_id);
break;
case ZAPI_ROUTE_REMOVE_FAIL:
DEBUGD(&pbr_dbg_zebra,
"%s: [%pFX] Route remove fail for table: %u", __func__,
&p, table_id);
break;
}
return 0;
}
static int rule_notify_owner(ZAPI_CALLBACK_ARGS)
{
uint32_t seqno, priority, unique;
enum zapi_rule_notify_owner note;
struct pbr_map_sequence *pbrms;
struct pbr_map_interface *pmi;
char ifname[INTERFACE_NAMSIZ + 1];
uint64_t installed;
if (!zapi_rule_notify_decode(zclient->ibuf, &seqno, &priority, &unique,
ifname, ¬e))
return -1;
pmi = NULL;
pbrms = pbrms_lookup_unique(unique, ifname, &pmi);
if (!pbrms) {
DEBUGD(&pbr_dbg_zebra,
"%s: Failure to lookup pbrms based upon %u", __func__,
unique);
return 0;
}
installed = 1 << pmi->install_bit;
switch (note) {
case ZAPI_RULE_FAIL_INSTALL:
pbrms->installed &= ~installed;
break;
case ZAPI_RULE_INSTALLED:
pbrms->installed |= installed;
break;
case ZAPI_RULE_FAIL_REMOVE:
/* Don't change state on rule removal failure */
break;
case ZAPI_RULE_REMOVED:
pbrms->installed &= ~installed;
break;
}
DEBUGD(&pbr_dbg_zebra, "%s: Received %s: %" PRIu64, __func__,
zapi_rule_notify_owner2str(note), pbrms->installed);
pbr_map_final_interface_deletion(pbrms->parent, pmi);
return 0;
}
static void zebra_connected(struct zclient *zclient)
{
DEBUGD(&pbr_dbg_zebra, "%s: Registering for fun and profit", __func__);
zclient_send_reg_requests(zclient, VRF_DEFAULT);
}
static void route_add_helper(struct zapi_route *api, struct nexthop_group nhg,
uint8_t install_afi)
{
struct zapi_nexthop *api_nh;
struct nexthop *nhop;
int i;
api->prefix.family = install_afi;
DEBUGD(&pbr_dbg_zebra, " Encoding %pFX", &api->prefix);
i = 0;
for (ALL_NEXTHOPS(nhg, nhop)) {
api_nh = &api->nexthops[i];
api_nh->vrf_id = nhop->vrf_id;
api_nh->type = nhop->type;
api_nh->weight = nhop->weight;
switch (nhop->type) {
case NEXTHOP_TYPE_IPV4:
api_nh->gate.ipv4 = nhop->gate.ipv4;
break;
case NEXTHOP_TYPE_IPV4_IFINDEX:
api_nh->gate.ipv4 = nhop->gate.ipv4;
api_nh->ifindex = nhop->ifindex;
break;
case NEXTHOP_TYPE_IFINDEX:
api_nh->ifindex = nhop->ifindex;
break;
case NEXTHOP_TYPE_IPV6:
memcpy(&api_nh->gate.ipv6, &nhop->gate.ipv6,
IPV6_MAX_BYTELEN);
break;
case NEXTHOP_TYPE_IPV6_IFINDEX:
api_nh->ifindex = nhop->ifindex;
memcpy(&api_nh->gate.ipv6, &nhop->gate.ipv6,
IPV6_MAX_BYTELEN);
break;
case NEXTHOP_TYPE_BLACKHOLE:
api_nh->bh_type = nhop->bh_type;
break;
}
i++;
}
api->nexthop_num = i;
zclient_route_send(ZEBRA_ROUTE_ADD, zclient, api);
}
/*
* This function assumes a default route is being
* installed into the appropriate tableid
*/
void route_add(struct pbr_nexthop_group_cache *pnhgc, struct nexthop_group nhg,
afi_t install_afi)
{
struct zapi_route api;
DEBUGD(&pbr_dbg_zebra, "%s for Table: %d", __func__, pnhgc->table_id);
memset(&api, 0, sizeof(api));
api.vrf_id = VRF_DEFAULT;
api.type = ZEBRA_ROUTE_PBR;
api.safi = SAFI_UNICAST;
/*
* Sending a default route
*/
api.tableid = pnhgc->table_id;
SET_FLAG(api.flags, ZEBRA_FLAG_ALLOW_RECURSION);
SET_FLAG(api.message, ZAPI_MESSAGE_TABLEID);
SET_FLAG(api.message, ZAPI_MESSAGE_NEXTHOP);
switch (install_afi) {
case AFI_MAX:
route_add_helper(&api, nhg, AF_INET);
route_add_helper(&api, nhg, AF_INET6);
break;
case AFI_IP:
route_add_helper(&api, nhg, AF_INET);
break;
case AFI_IP6:
route_add_helper(&api, nhg, AF_INET6);
break;
case AFI_L2VPN:
DEBUGD(&pbr_dbg_zebra,
"%s: Asked to install unsupported route type: L2VPN",
__func__);
break;
case AFI_UNSPEC:
DEBUGD(&pbr_dbg_zebra,
"%s: Asked to install unspecified route type", __func__);
break;
}
}
/*
* This function assumes a default route is being
* removed from the appropriate tableid
*/
void route_delete(struct pbr_nexthop_group_cache *pnhgc, afi_t afi)
{
struct zapi_route api;
DEBUGD(&pbr_dbg_zebra, "%s for Table: %d", __func__, pnhgc->table_id);
memset(&api, 0, sizeof(api));
api.vrf_id = VRF_DEFAULT;
api.type = ZEBRA_ROUTE_PBR;
api.safi = SAFI_UNICAST;
api.tableid = pnhgc->table_id;
SET_FLAG(api.message, ZAPI_MESSAGE_TABLEID);
switch (afi) {
case AFI_IP:
api.prefix.family = AF_INET;
zclient_route_send(ZEBRA_ROUTE_DELETE, zclient, &api);
break;
case AFI_IP6:
api.prefix.family = AF_INET6;
zclient_route_send(ZEBRA_ROUTE_DELETE, zclient, &api);
break;
case AFI_MAX:
api.prefix.family = AF_INET;
zclient_route_send(ZEBRA_ROUTE_DELETE, zclient, &api);
api.prefix.family = AF_INET6;
zclient_route_send(ZEBRA_ROUTE_DELETE, zclient, &api);
break;
case AFI_L2VPN:
DEBUGD(&pbr_dbg_zebra,
"%s: Asked to delete unsupported route type: L2VPN",
__func__);
break;
case AFI_UNSPEC:
DEBUGD(&pbr_dbg_zebra,
"%s: Asked to delete unspecified route type", __func__);
break;
}
}
static int pbr_zebra_nexthop_update(ZAPI_CALLBACK_ARGS)
{
struct zapi_route nhr;
uint32_t i;
if (!zapi_nexthop_update_decode(zclient->ibuf, &nhr)) {
zlog_err("Failure to decode Nexthop update message");
return 0;
}
if (DEBUG_MODE_CHECK(&pbr_dbg_zebra, DEBUG_MODE_ALL)) {
DEBUGD(&pbr_dbg_zebra, "%s: Received Nexthop update: %pFX",
__func__, &nhr.prefix);
DEBUGD(&pbr_dbg_zebra, "%s: (Nexthops(%u)", __func__,
nhr.nexthop_num);
for (i = 0; i < nhr.nexthop_num; i++) {
DEBUGD(&pbr_dbg_zebra,
"%s: Type: %d: vrf: %d, ifindex: %d gate: %pI4",
__func__, nhr.nexthops[i].type,
nhr.nexthops[i].vrf_id, nhr.nexthops[i].ifindex,
&nhr.nexthops[i].gate.ipv4);
}
}
pbr_nht_nexthop_update(&nhr);
return 1;
}
extern struct zebra_privs_t pbr_privs;
void pbr_zebra_init(void)
{
struct zclient_options opt = { .receive_notify = true };
zclient = zclient_new(master, &opt);
zclient_init(zclient, ZEBRA_ROUTE_PBR, 0, &pbr_privs);
zclient->zebra_connected = zebra_connected;
zclient->interface_address_add = interface_address_add;
zclient->interface_address_delete = interface_address_delete;
zclient->interface_vrf_update = interface_vrf_update;
zclient->route_notify_owner = route_notify_owner;
zclient->rule_notify_owner = rule_notify_owner;
zclient->nexthop_update = pbr_zebra_nexthop_update;
}
void pbr_send_rnh(struct nexthop *nhop, bool reg)
{
uint32_t command;
struct prefix p;
command = (reg) ?
ZEBRA_NEXTHOP_REGISTER : ZEBRA_NEXTHOP_UNREGISTER;
memset(&p, 0, sizeof(p));
switch (nhop->type) {
case NEXTHOP_TYPE_IFINDEX:
case NEXTHOP_TYPE_BLACKHOLE:
return;
case NEXTHOP_TYPE_IPV4:
case NEXTHOP_TYPE_IPV4_IFINDEX:
p.family = AF_INET;
p.u.prefix4.s_addr = nhop->gate.ipv4.s_addr;
p.prefixlen = IPV4_MAX_BITLEN;
break;
case NEXTHOP_TYPE_IPV6:
case NEXTHOP_TYPE_IPV6_IFINDEX:
p.family = AF_INET6;
memcpy(&p.u.prefix6, &nhop->gate.ipv6, IPV6_MAX_BYTELEN);
p.prefixlen = IPV6_MAX_BITLEN;
if (IN6_IS_ADDR_LINKLOCAL(&nhop->gate.ipv6))
/*
* Don't bother tracking link locals, just track their
* interface state.
*/
return;
break;
}
if (zclient_send_rnh(zclient, command, &p, false, nhop->vrf_id)
== ZCLIENT_SEND_FAILURE) {
zlog_warn("%s: Failure to send nexthop to zebra", __func__);
}
}
static void pbr_encode_pbr_map_sequence_prefix(struct stream *s,
struct prefix *p,
unsigned char family)
{
struct prefix any;
if (!p) {
memset(&any, 0, sizeof(any));
any.family = family;
p = &any;
}
stream_putc(s, p->family);
stream_putc(s, p->prefixlen);
stream_put(s, &p->u.prefix, prefix_blen(p));
}
static void
pbr_encode_pbr_map_sequence_vrf(struct stream *s,
const struct pbr_map_sequence *pbrms,
const struct interface *ifp)
{
struct pbr_vrf *pbr_vrf;
if (pbrms->vrf_unchanged)
pbr_vrf = pbr_vrf_lookup_by_id(ifp->vrf_id);
else
pbr_vrf = pbr_vrf_lookup_by_name(pbrms->vrf_name);
if (!pbr_vrf) {
DEBUGD(&pbr_dbg_zebra, "%s: VRF not found", __func__);
return;
}
stream_putl(s, pbr_vrf->vrf->data.l.table_id);
}
static void pbr_encode_pbr_map_sequence(struct stream *s,
struct pbr_map_sequence *pbrms,
struct interface *ifp)
{
unsigned char family;
family = AF_INET;
if (pbrms->family)
family = pbrms->family;
stream_putl(s, pbrms->seqno);
stream_putl(s, pbrms->ruleno);
stream_putl(s, pbrms->unique);
stream_putc(s, pbrms->ip_proto); /* The ip_proto */
pbr_encode_pbr_map_sequence_prefix(s, pbrms->src, family);
stream_putw(s, pbrms->src_prt);
pbr_encode_pbr_map_sequence_prefix(s, pbrms->dst, family);
stream_putw(s, pbrms->dst_prt);
stream_putc(s, pbrms->dsfield);
stream_putl(s, pbrms->mark);
if (pbrms->vrf_unchanged || pbrms->vrf_lookup)
pbr_encode_pbr_map_sequence_vrf(s, pbrms, ifp);
else if (pbrms->nhgrp_name)
stream_putl(s, pbr_nht_get_table(pbrms->nhgrp_name));
else if (pbrms->nhg)
stream_putl(s, pbr_nht_get_table(pbrms->internal_nhg_name));
stream_put(s, ifp->name, INTERFACE_NAMSIZ);
}
bool pbr_send_pbr_map(struct pbr_map_sequence *pbrms,
struct pbr_map_interface *pmi, bool install, bool changed)
{
struct pbr_map *pbrm = pbrms->parent;
struct stream *s;
uint64_t is_installed = (uint64_t)1 << pmi->install_bit;
is_installed &= pbrms->installed;
DEBUGD(&pbr_dbg_zebra, "%s: for %s %d(%" PRIu64 ")", __func__,
pbrm->name, install, is_installed);
/*
* If we are installed and asked to do so again and the config
* has not changed, just return.
*
* If we are not installed and asked
* to delete just return.
*/
if (install && is_installed && !changed)
return false;
if (!install && !is_installed)
return false;
s = zclient->obuf;
stream_reset(s);
zclient_create_header(s,
install ? ZEBRA_RULE_ADD : ZEBRA_RULE_DELETE,
VRF_DEFAULT);
/*
* We are sending one item at a time at the moment
*/
stream_putl(s, 1);
DEBUGD(&pbr_dbg_zebra, "%s: %s %s seq %u %d %s %u", __func__,
install ? "Installing" : "Deleting", pbrm->name, pbrms->seqno,
install, pmi->ifp->name, pmi->delete);
pbr_encode_pbr_map_sequence(s, pbrms, pmi->ifp);
stream_putw_at(s, 0, stream_get_endp(s));
zclient_send_message(zclient);
return true;
}
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