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bgp_mplsvpn.c
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/* MPLS-VPN
* Copyright (C) 2000 Kunihiro Ishiguro <kunihiro@zebra.org>
*
* 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 "prefix.h"
#include "log.h"
#include "memory.h"
#include "stream.h"
#include "queue.h"
#include "filter.h"
#include "mpls.h"
#include "json.h"
#include "zclient.h"
#include "bgpd/bgpd.h"
#include "bgpd/bgp_debug.h"
#include "bgpd/bgp_errors.h"
#include "bgpd/bgp_table.h"
#include "bgpd/bgp_route.h"
#include "bgpd/bgp_attr.h"
#include "bgpd/bgp_label.h"
#include "bgpd/bgp_mplsvpn.h"
#include "bgpd/bgp_packet.h"
#include "bgpd/bgp_vty.h"
#include "bgpd/bgp_vpn.h"
#include "bgpd/bgp_ecommunity.h"
#include "bgpd/bgp_zebra.h"
#include "bgpd/bgp_nexthop.h"
#include "bgpd/bgp_nht.h"
#include "bgpd/bgp_evpn.h"
#ifdef ENABLE_BGP_VNC
#include "bgpd/rfapi/rfapi_backend.h"
#endif
/*
* Definitions and external declarations.
*/
extern struct zclient *zclient;
extern int argv_find_and_parse_vpnvx(struct cmd_token **argv, int argc,
int *index, afi_t *afi)
{
int ret = 0;
if (argv_find(argv, argc, "vpnv4", index)) {
ret = 1;
if (afi)
*afi = AFI_IP;
} else if (argv_find(argv, argc, "vpnv6", index)) {
ret = 1;
if (afi)
*afi = AFI_IP6;
}
return ret;
}
uint32_t decode_label(mpls_label_t *label_pnt)
{
uint32_t l;
uint8_t *pnt = (uint8_t *)label_pnt;
l = ((uint32_t)*pnt++ << 12);
l |= (uint32_t)*pnt++ << 4;
l |= (uint32_t)((*pnt & 0xf0) >> 4);
return l;
}
void encode_label(mpls_label_t label, mpls_label_t *label_pnt)
{
uint8_t *pnt = (uint8_t *)label_pnt;
if (pnt == NULL)
return;
if (label == BGP_PREVENT_VRF_2_VRF_LEAK) {
*label_pnt = label;
return;
}
*pnt++ = (label >> 12) & 0xff;
*pnt++ = (label >> 4) & 0xff;
*pnt++ = ((label << 4) + 1) & 0xff; /* S=1 */
}
int bgp_nlri_parse_vpn(struct peer *peer, struct attr *attr,
struct bgp_nlri *packet)
{
struct prefix p;
uint8_t psize = 0;
uint8_t prefixlen;
uint16_t type;
struct rd_as rd_as;
struct rd_ip rd_ip;
struct prefix_rd prd = {0};
mpls_label_t label = {0};
afi_t afi;
safi_t safi;
int addpath_encoded;
uint32_t addpath_id;
int ret = 0;
/* Make prefix_rd */
prd.family = AF_UNSPEC;
prd.prefixlen = 64;
struct stream *data = stream_new(packet->length);
stream_put(data, packet->nlri, packet->length);
afi = packet->afi;
safi = packet->safi;
addpath_id = 0;
addpath_encoded =
(CHECK_FLAG(peer->af_cap[afi][safi], PEER_CAP_ADDPATH_AF_RX_ADV)
&& CHECK_FLAG(peer->af_cap[afi][safi],
PEER_CAP_ADDPATH_AF_TX_RCV));
#define VPN_PREFIXLEN_MIN_BYTES (3 + 8) /* label + RD */
while (STREAM_READABLE(data) > 0) {
/* Clear prefix structure. */
memset(&p, 0, sizeof(struct prefix));
if (addpath_encoded) {
STREAM_GET(&addpath_id, data, BGP_ADDPATH_ID_LEN);
addpath_id = ntohl(addpath_id);
}
if (STREAM_READABLE(data) < 1) {
flog_err(
EC_BGP_UPDATE_RCV,
"%s [Error] Update packet error / VPN (truncated NLRI of size %u; no prefix length)",
peer->host, packet->length);
ret = BGP_NLRI_PARSE_ERROR_PACKET_LENGTH;
goto done;
}
/* Fetch prefix length. */
STREAM_GETC(data, prefixlen);
p.family = afi2family(packet->afi);
psize = PSIZE(prefixlen);
if (prefixlen < VPN_PREFIXLEN_MIN_BYTES * 8) {
flog_err(
EC_BGP_UPDATE_RCV,
"%s [Error] Update packet error / VPN (prefix length %d less than VPN min length)",
peer->host, prefixlen);
ret = BGP_NLRI_PARSE_ERROR_PREFIX_LENGTH;
goto done;
}
/* sanity check against packet data */
if (STREAM_READABLE(data) < psize) {
flog_err(
EC_BGP_UPDATE_RCV,
"%s [Error] Update packet error / VPN (prefix length %d exceeds packet size %u)",
peer->host, prefixlen, packet->length);
ret = BGP_NLRI_PARSE_ERROR_PACKET_OVERFLOW;
goto done;
}
/* sanity check against storage for the IP address portion */
if ((psize - VPN_PREFIXLEN_MIN_BYTES) > (ssize_t)sizeof(p.u)) {
flog_err(
EC_BGP_UPDATE_RCV,
"%s [Error] Update packet error / VPN (psize %d exceeds storage size %zu)",
peer->host,
prefixlen - VPN_PREFIXLEN_MIN_BYTES * 8,
sizeof(p.u));
ret = BGP_NLRI_PARSE_ERROR_PACKET_LENGTH;
goto done;
}
/* Sanity check against max bitlen of the address family */
if ((psize - VPN_PREFIXLEN_MIN_BYTES) > prefix_blen(&p)) {
flog_err(
EC_BGP_UPDATE_RCV,
"%s [Error] Update packet error / VPN (psize %d exceeds family (%u) max byte len %u)",
peer->host,
prefixlen - VPN_PREFIXLEN_MIN_BYTES * 8,
p.family, prefix_blen(&p));
ret = BGP_NLRI_PARSE_ERROR_PACKET_LENGTH;
goto done;
}
/* Copy label to prefix. */
if (STREAM_READABLE(data) < BGP_LABEL_BYTES) {
flog_err(
EC_BGP_UPDATE_RCV,
"%s [Error] Update packet error / VPN (truncated NLRI of size %u; no label)",
peer->host, packet->length);
ret = BGP_NLRI_PARSE_ERROR_PACKET_LENGTH;
goto done;
}
STREAM_GET(&label, data, BGP_LABEL_BYTES);
bgp_set_valid_label(&label);
/* Copy routing distinguisher to rd. */
if (STREAM_READABLE(data) < 8) {
flog_err(
EC_BGP_UPDATE_RCV,
"%s [Error] Update packet error / VPN (truncated NLRI of size %u; no RD)",
peer->host, packet->length);
ret = BGP_NLRI_PARSE_ERROR_PACKET_LENGTH;
goto done;
}
STREAM_GET(&prd.val, data, 8);
/* Decode RD type. */
type = decode_rd_type(prd.val);
switch (type) {
case RD_TYPE_AS:
decode_rd_as(&prd.val[2], &rd_as);
break;
case RD_TYPE_AS4:
decode_rd_as4(&prd.val[2], &rd_as);
break;
case RD_TYPE_IP:
decode_rd_ip(&prd.val[2], &rd_ip);
break;
#ifdef ENABLE_BGP_VNC
case RD_TYPE_VNC_ETH:
break;
#endif
default:
flog_err(EC_BGP_UPDATE_RCV, "Unknown RD type %d", type);
break; /* just report */
}
/* exclude label & RD */
p.prefixlen = prefixlen - VPN_PREFIXLEN_MIN_BYTES * 8;
STREAM_GET(p.u.val, data, psize - VPN_PREFIXLEN_MIN_BYTES);
if (attr) {
bgp_update(peer, &p, addpath_id, attr, packet->afi,
SAFI_MPLS_VPN, ZEBRA_ROUTE_BGP,
BGP_ROUTE_NORMAL, &prd, &label, 1, 0, NULL);
} else {
bgp_withdraw(peer, &p, addpath_id, attr, packet->afi,
SAFI_MPLS_VPN, ZEBRA_ROUTE_BGP,
BGP_ROUTE_NORMAL, &prd, &label, 1, NULL);
}
}
/* Packet length consistency check. */
if (STREAM_READABLE(data) != 0) {
flog_err(
EC_BGP_UPDATE_RCV,
"%s [Error] Update packet error / VPN (%zu data remaining after parsing)",
peer->host, STREAM_READABLE(data));
return BGP_NLRI_PARSE_ERROR_PACKET_LENGTH;
}
goto done;
stream_failure:
flog_err(
EC_BGP_UPDATE_RCV,
"%s [Error] Update packet error / VPN (NLRI of size %u - length error)",
peer->host, packet->length);
ret = BGP_NLRI_PARSE_ERROR_PACKET_LENGTH;
done:
stream_free(data);
return ret;
#undef VPN_PREFIXLEN_MIN_BYTES
}
/*
* This function informs zebra of the label this vrf sets on routes
* leaked to VPN. Zebra should install this label in the kernel with
* an action of "pop label and then use this vrf's IP FIB to route the PDU."
*
* Sending this vrf-label association is qualified by a) whether vrf->vpn
* exporting is active ("export vpn" is enabled, vpn-policy RD and RT list
* are set) and b) whether vpn-policy label is set.
*
* If any of these conditions do not hold, then we send MPLS_LABEL_NONE
* for this vrf, which zebra interprets to mean "delete this vrf-label
* association."
*/
void vpn_leak_zebra_vrf_label_update(struct bgp *bgp, afi_t afi)
{
mpls_label_t label = MPLS_LABEL_NONE;
int debug = BGP_DEBUG(vpn, VPN_LEAK_LABEL);
if (bgp->vrf_id == VRF_UNKNOWN) {
if (debug) {
zlog_debug(
"%s: vrf %s: afi %s: vrf_id not set, can't set zebra vrf label",
__func__, bgp->name_pretty, afi2str(afi));
}
return;
}
if (vpn_leak_to_vpn_active(bgp, afi, NULL)) {
label = bgp->vpn_policy[afi].tovpn_label;
}
if (debug) {
zlog_debug("%s: vrf %s: afi %s: setting label %d for vrf id %d",
__func__, bgp->name_pretty, afi2str(afi), label,
bgp->vrf_id);
}
if (label == BGP_PREVENT_VRF_2_VRF_LEAK)
label = MPLS_LABEL_NONE;
zclient_send_vrf_label(zclient, bgp->vrf_id, afi, label, ZEBRA_LSP_BGP);
bgp->vpn_policy[afi].tovpn_zebra_vrf_label_last_sent = label;
}
/*
* If zebra tells us vrf has become unconfigured, tell zebra not to
* use this label to forward to the vrf anymore
*/
void vpn_leak_zebra_vrf_label_withdraw(struct bgp *bgp, afi_t afi)
{
mpls_label_t label = MPLS_LABEL_NONE;
int debug = BGP_DEBUG(vpn, VPN_LEAK_LABEL);
if (bgp->vrf_id == VRF_UNKNOWN) {
if (debug) {
zlog_debug(
"%s: vrf_id not set, can't delete zebra vrf label",
__func__);
}
return;
}
if (debug) {
zlog_debug("%s: deleting label for vrf %s (id=%d)", __func__,
bgp->name_pretty, bgp->vrf_id);
}
zclient_send_vrf_label(zclient, bgp->vrf_id, afi, label, ZEBRA_LSP_BGP);
bgp->vpn_policy[afi].tovpn_zebra_vrf_label_last_sent = label;
}
int vpn_leak_label_callback(
mpls_label_t label,
void *labelid,
bool allocated)
{
struct vpn_policy *vp = (struct vpn_policy *)labelid;
int debug = BGP_DEBUG(vpn, VPN_LEAK_LABEL);
if (debug)
zlog_debug("%s: label=%u, allocated=%d",
__func__, label, allocated);
if (!allocated) {
/*
* previously-allocated label is now invalid
*/
if (CHECK_FLAG(vp->flags, BGP_VPN_POLICY_TOVPN_LABEL_AUTO) &&
(vp->tovpn_label != MPLS_LABEL_NONE)) {
vpn_leak_prechange(BGP_VPN_POLICY_DIR_TOVPN,
vp->afi, bgp_get_default(), vp->bgp);
vp->tovpn_label = MPLS_LABEL_NONE;
vpn_leak_postchange(BGP_VPN_POLICY_DIR_TOVPN,
vp->afi, bgp_get_default(), vp->bgp);
}
return 0;
}
/*
* New label allocation
*/
if (!CHECK_FLAG(vp->flags, BGP_VPN_POLICY_TOVPN_LABEL_AUTO)) {
/*
* not currently configured for auto label, reject allocation
*/
return -1;
}
if (vp->tovpn_label != MPLS_LABEL_NONE) {
if (label == vp->tovpn_label) {
/* already have same label, accept but do nothing */
return 0;
}
/* Shouldn't happen: different label allocation */
flog_err(EC_BGP_LABEL,
"%s: %s had label %u but got new assignment %u",
__func__, vp->bgp->name_pretty, vp->tovpn_label,
label);
/* use new one */
}
vpn_leak_prechange(BGP_VPN_POLICY_DIR_TOVPN,
vp->afi, bgp_get_default(), vp->bgp);
vp->tovpn_label = label;
vpn_leak_postchange(BGP_VPN_POLICY_DIR_TOVPN,
vp->afi, bgp_get_default(), vp->bgp);
return 0;
}
static bool ecom_intersect(struct ecommunity *e1, struct ecommunity *e2)
{
uint32_t i, j;
if (!e1 || !e2)
return false;
for (i = 0; i < e1->size; ++i) {
for (j = 0; j < e2->size; ++j) {
if (!memcmp(e1->val + (i * e1->unit_size),
e2->val + (j * e2->unit_size),
e1->unit_size)) {
return true;
}
}
}
return false;
}
static bool labels_same(struct bgp_path_info *bpi, mpls_label_t *label,
uint32_t n)
{
uint32_t i;
if (!bpi->extra) {
if (!n)
return true;
else
return false;
}
if (n != bpi->extra->num_labels)
return false;
for (i = 0; i < n; ++i) {
if (label[i] != bpi->extra->label[i])
return false;
}
return true;
}
/*
* make encoded route labels match specified encoded label set
*/
static void setlabels(struct bgp_path_info *bpi,
mpls_label_t *label, /* array of labels */
uint32_t num_labels)
{
if (num_labels)
assert(label);
assert(num_labels <= BGP_MAX_LABELS);
if (!num_labels) {
if (bpi->extra)
bpi->extra->num_labels = 0;
return;
}
struct bgp_path_info_extra *extra = bgp_path_info_extra_get(bpi);
uint32_t i;
for (i = 0; i < num_labels; ++i) {
extra->label[i] = label[i];
if (!bgp_is_valid_label(&label[i])) {
bgp_set_valid_label(&extra->label[i]);
}
}
extra->num_labels = num_labels;
}
/*
* returns pointer to new bgp_path_info upon success
*/
static struct bgp_path_info *
leak_update(struct bgp *bgp, /* destination bgp instance */
struct bgp_dest *bn, struct attr *new_attr, /* already interned */
afi_t afi, safi_t safi, struct bgp_path_info *source_bpi,
mpls_label_t *label, uint32_t num_labels, void *parent,
struct bgp *bgp_orig, struct prefix *nexthop_orig,
int nexthop_self_flag, int debug)
{
const struct prefix *p = bgp_dest_get_prefix(bn);
struct bgp_path_info *bpi;
struct bgp_path_info *bpi_ultimate;
struct bgp_path_info *new;
if (debug)
zlog_debug(
"%s: entry: leak-to=%s, p=%pBD, type=%d, sub_type=%d",
__func__, bgp->name_pretty, bn, source_bpi->type,
source_bpi->sub_type);
/*
* Routes that are redistributed into BGP from zebra do not get
* nexthop tracking. However, if those routes are subsequently
* imported to other RIBs within BGP, the leaked routes do not
* carry the original BGP_ROUTE_REDISTRIBUTE sub_type. Therefore,
* in order to determine if the route we are currently leaking
* should have nexthop tracking, we must find the ultimate
* parent so we can check its sub_type.
*
* As of now, source_bpi may at most be a second-generation route
* (only one hop back to ultimate parent for vrf-vpn-vrf scheme).
* Using a loop here supports more complex intra-bgp import-export
* schemes that could be implemented in the future.
*
*/
for (bpi_ultimate = source_bpi;
bpi_ultimate->extra && bpi_ultimate->extra->parent;
bpi_ultimate = bpi_ultimate->extra->parent)
;
/*
* match parent
*/
for (bpi = bgp_dest_get_bgp_path_info(bn); bpi; bpi = bpi->next) {
if (bpi->extra && bpi->extra->parent == parent)
break;
}
if (bpi) {
bool labelssame = labels_same(bpi, label, num_labels);
if (attrhash_cmp(bpi->attr, new_attr) && labelssame
&& !CHECK_FLAG(bpi->flags, BGP_PATH_REMOVED)) {
bgp_attr_unintern(&new_attr);
if (debug)
zlog_debug(
"%s: ->%s: %pBD: Found route, no change",
__func__, bgp->name_pretty, bn);
return NULL;
}
/* attr is changed */
bgp_path_info_set_flag(bn, bpi, BGP_PATH_ATTR_CHANGED);
/* Rewrite BGP route information. */
if (CHECK_FLAG(bpi->flags, BGP_PATH_REMOVED))
bgp_path_info_restore(bn, bpi);
else
bgp_aggregate_decrement(bgp, p, bpi, afi, safi);
bgp_attr_unintern(&bpi->attr);
bpi->attr = new_attr;
bpi->uptime = bgp_clock();
/*
* rewrite labels
*/
if (!labelssame)
setlabels(bpi, label, num_labels);
if (nexthop_self_flag)
bgp_path_info_set_flag(bn, bpi, BGP_PATH_ANNC_NH_SELF);
struct bgp *bgp_nexthop = bgp;
int nh_valid;
if (bpi->extra && bpi->extra->bgp_orig)
bgp_nexthop = bpi->extra->bgp_orig;
/*
* No nexthop tracking for redistributed routes or for
* EVPN-imported routes that get leaked.
*/
if (bpi_ultimate->sub_type == BGP_ROUTE_REDISTRIBUTE ||
is_pi_family_evpn(bpi_ultimate))
nh_valid = 1;
else
/*
* TBD do we need to do anything about the
* 'connected' parameter?
*/
nh_valid = bgp_find_or_add_nexthop(
bgp, bgp_nexthop, afi, safi, bpi, NULL, 0);
if (debug)
zlog_debug("%s: nexthop is %svalid (in vrf %s)",
__func__, (nh_valid ? "" : "not "),
bgp_nexthop->name_pretty);
if (nh_valid)
bgp_path_info_set_flag(bn, bpi, BGP_PATH_VALID);
/* Process change. */
bgp_aggregate_increment(bgp, p, bpi, afi, safi);
bgp_process(bgp, bn, afi, safi);
bgp_dest_unlock_node(bn);
if (debug)
zlog_debug("%s: ->%s: %pBD Found route, changed attr",
__func__, bgp->name_pretty, bn);
return bpi;
}
new = info_make(ZEBRA_ROUTE_BGP, BGP_ROUTE_IMPORTED, 0,
bgp->peer_self, new_attr, bn);
if (nexthop_self_flag)
bgp_path_info_set_flag(bn, new, BGP_PATH_ANNC_NH_SELF);
bgp_path_info_extra_get(new);
if (num_labels)
setlabels(new, label, num_labels);
new->extra->parent = bgp_path_info_lock(parent);
bgp_dest_lock_node(
(struct bgp_dest *)((struct bgp_path_info *)parent)->net);
if (bgp_orig)
new->extra->bgp_orig = bgp_lock(bgp_orig);
if (nexthop_orig)
new->extra->nexthop_orig = *nexthop_orig;
/*
* nexthop tracking for unicast routes
*/
struct bgp *bgp_nexthop = bgp;
int nh_valid;
if (new->extra->bgp_orig)
bgp_nexthop = new->extra->bgp_orig;
/*
* No nexthop tracking for redistributed routes because
* their originating protocols will do the tracking and
* withdraw those routes if the nexthops become unreachable
* This also holds good for EVPN-imported routes that get
* leaked.
*/
if (bpi_ultimate->sub_type == BGP_ROUTE_REDISTRIBUTE ||
is_pi_family_evpn(bpi_ultimate))
nh_valid = 1;
else
/*
* TBD do we need to do anything about the
* 'connected' parameter?
*/
nh_valid = bgp_find_or_add_nexthop(bgp, bgp_nexthop, afi, safi,
new, NULL, 0);
if (debug)
zlog_debug("%s: nexthop is %svalid (in vrf %s)",
__func__, (nh_valid ? "" : "not "),
bgp_nexthop->name_pretty);
if (nh_valid)
bgp_path_info_set_flag(bn, new, BGP_PATH_VALID);
bgp_aggregate_increment(bgp, p, new, afi, safi);
bgp_path_info_add(bn, new);
bgp_dest_unlock_node(bn);
bgp_process(bgp, bn, afi, safi);
if (debug)
zlog_debug("%s: ->%s: %pBD: Added new route", __func__,
bgp->name_pretty, bn);
return new;
}
/* cf vnc_import_bgp_add_route_mode_nvegroup() and add_vnc_route() */
void vpn_leak_from_vrf_update(struct bgp *bgp_vpn, /* to */
struct bgp *bgp_vrf, /* from */
struct bgp_path_info *path_vrf) /* route */
{
int debug = BGP_DEBUG(vpn, VPN_LEAK_FROM_VRF);
const struct prefix *p = bgp_dest_get_prefix(path_vrf->net);
afi_t afi = family2afi(p->family);
struct attr static_attr = {0};
struct attr *new_attr = NULL;
safi_t safi = SAFI_MPLS_VPN;
mpls_label_t label_val;
mpls_label_t label;
struct bgp_dest *bn;
const char *debugmsg;
int nexthop_self_flag = 0;
if (debug)
zlog_debug("%s: from vrf %s", __func__, bgp_vrf->name_pretty);
if (debug && path_vrf->attr->ecommunity) {
char *s = ecommunity_ecom2str(path_vrf->attr->ecommunity,
ECOMMUNITY_FORMAT_ROUTE_MAP, 0);
zlog_debug("%s: %s path_vrf->type=%d, EC{%s}", __func__,
bgp_vrf->name, path_vrf->type, s);
XFREE(MTYPE_ECOMMUNITY_STR, s);
}
if (!bgp_vpn)
return;
if (!afi) {
if (debug)
zlog_debug("%s: can't get afi of prefix", __func__);
return;
}
/* Is this route exportable into the VPN table? */
if (!is_route_injectable_into_vpn(path_vrf))
return;
if (!vpn_leak_to_vpn_active(bgp_vrf, afi, &debugmsg)) {
if (debug)
zlog_debug("%s: %s skipping: %s", __func__,
bgp_vrf->name, debugmsg);
return;
}
/* shallow copy */
static_attr = *path_vrf->attr;
/*
* route map handling
*/
if (bgp_vrf->vpn_policy[afi].rmap[BGP_VPN_POLICY_DIR_TOVPN]) {
struct bgp_path_info info;
route_map_result_t ret;
memset(&info, 0, sizeof(info));
info.peer = bgp_vpn->peer_self;
info.attr = &static_attr;
ret = route_map_apply(
bgp_vrf->vpn_policy[afi].rmap[BGP_VPN_POLICY_DIR_TOVPN],
p, &info);
if (RMAP_DENYMATCH == ret) {
bgp_attr_flush(&static_attr); /* free any added parts */
if (debug)
zlog_debug(
"%s: vrf %s route map \"%s\" says DENY, returning",
__func__, bgp_vrf->name_pretty,
bgp_vrf->vpn_policy[afi]
.rmap[BGP_VPN_POLICY_DIR_TOVPN]
->name);
return;
}
}
if (debug && static_attr.ecommunity) {
char *s = ecommunity_ecom2str(static_attr.ecommunity,
ECOMMUNITY_FORMAT_ROUTE_MAP, 0);
zlog_debug("%s: post route map static_attr.ecommunity{%s}",
__func__, s);
XFREE(MTYPE_ECOMMUNITY_STR, s);
}
/*
* Add the vpn-policy rt-list
*/
struct ecommunity *old_ecom;
struct ecommunity *new_ecom;
/* Export with the 'from' instance's export RTs. */
/* If doing VRF-to-VRF leaking, strip existing RTs first. */
old_ecom = static_attr.ecommunity;
if (old_ecom) {
new_ecom = ecommunity_dup(old_ecom);
if (CHECK_FLAG(bgp_vrf->af_flags[afi][SAFI_UNICAST],
BGP_CONFIG_VRF_TO_VRF_EXPORT))
ecommunity_strip_rts(new_ecom);
new_ecom = ecommunity_merge(new_ecom,
bgp_vrf->vpn_policy[afi]
.rtlist[BGP_VPN_POLICY_DIR_TOVPN]);
if (!old_ecom->refcnt)
ecommunity_free(&old_ecom);
} else {
new_ecom = ecommunity_dup(
bgp_vrf->vpn_policy[afi]
.rtlist[BGP_VPN_POLICY_DIR_TOVPN]);
}
static_attr.ecommunity = new_ecom;
SET_FLAG(static_attr.flag, ATTR_FLAG_BIT(BGP_ATTR_EXT_COMMUNITIES));
if (debug && static_attr.ecommunity) {
char *s = ecommunity_ecom2str(static_attr.ecommunity,
ECOMMUNITY_FORMAT_ROUTE_MAP, 0);
zlog_debug("%s: post merge static_attr.ecommunity{%s}",
__func__, s);
XFREE(MTYPE_ECOMMUNITY_STR, s);
}
/* Nexthop */
/* if policy nexthop not set, use 0 */
if (CHECK_FLAG(bgp_vrf->vpn_policy[afi].flags,
BGP_VPN_POLICY_TOVPN_NEXTHOP_SET)) {
struct prefix *nexthop =
&bgp_vrf->vpn_policy[afi].tovpn_nexthop;
switch (nexthop->family) {
case AF_INET:
/* prevent mp_nexthop_global_in <- self in bgp_route.c
*/
static_attr.nexthop.s_addr = nexthop->u.prefix4.s_addr;
static_attr.mp_nexthop_global_in = nexthop->u.prefix4;
static_attr.mp_nexthop_len = BGP_ATTR_NHLEN_IPV4;
break;
case AF_INET6:
static_attr.mp_nexthop_global = nexthop->u.prefix6;
static_attr.mp_nexthop_len = BGP_ATTR_NHLEN_IPV6_GLOBAL;
break;
default:
assert(0);
}
} else {
if (!CHECK_FLAG(bgp_vrf->af_flags[afi][SAFI_UNICAST],
BGP_CONFIG_VRF_TO_VRF_EXPORT)) {
if (afi == AFI_IP) {
/*
* For ipv4, copy to multiprotocol
* nexthop field
*/
static_attr.mp_nexthop_global_in =
static_attr.nexthop;
static_attr.mp_nexthop_len =
BGP_ATTR_NHLEN_IPV4;
/*
* XXX Leave static_attr.nexthop
* intact for NHT
*/
static_attr.flag &=
~ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP);
}
} else {
/* Update based on next-hop family to account for
* RFC 5549 (BGP unnumbered) scenario. Note that
* specific action is only needed for the case of
* IPv4 nexthops as the attr has been copied
* otherwise.
*/
if (afi == AFI_IP
&& !BGP_ATTR_NEXTHOP_AFI_IP6(path_vrf->attr)) {
static_attr.mp_nexthop_global_in.s_addr =
static_attr.nexthop.s_addr;
static_attr.mp_nexthop_len =
BGP_ATTR_NHLEN_IPV4;
static_attr.flag |=
ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP);
}
}
nexthop_self_flag = 1;
}
label_val = bgp_vrf->vpn_policy[afi].tovpn_label;
if (label_val == MPLS_LABEL_NONE) {
encode_label(MPLS_LABEL_IMPLICIT_NULL, &label);
} else {
encode_label(label_val, &label);
}
/* Set originator ID to "me" */
SET_FLAG(static_attr.flag, ATTR_FLAG_BIT(BGP_ATTR_ORIGINATOR_ID));
static_attr.originator_id = bgp_vpn->router_id;
new_attr = bgp_attr_intern(
&static_attr); /* hashed refcounted everything */
bgp_attr_flush(&static_attr); /* free locally-allocated parts */
if (debug && new_attr->ecommunity) {
char *s = ecommunity_ecom2str(new_attr->ecommunity,
ECOMMUNITY_FORMAT_ROUTE_MAP, 0);
zlog_debug("%s: new_attr->ecommunity{%s}", __func__, s);
XFREE(MTYPE_ECOMMUNITY_STR, s);
}
/* Now new_attr is an allocated interned attr */
bn = bgp_afi_node_get(bgp_vpn->rib[afi][safi], afi, safi, p,
&(bgp_vrf->vpn_policy[afi].tovpn_rd));
struct bgp_path_info *new_info;
new_info = leak_update(bgp_vpn, bn, new_attr, afi, safi, path_vrf,
&label, 1, path_vrf, bgp_vrf, NULL,
nexthop_self_flag, debug);
/*
* Routes actually installed in the vpn RIB must also be
* offered to all vrfs (because now they originate from
* the vpn RIB).
*
* Acceptance into other vrfs depends on rt-lists.
* Originating vrf will not accept the looped back route
* because of loop checking.
*/
if (new_info)
vpn_leak_to_vrf_update(bgp_vrf, new_info);
}
void vpn_leak_from_vrf_withdraw(struct bgp *bgp_vpn, /* to */
struct bgp *bgp_vrf, /* from */
struct bgp_path_info *path_vrf) /* route */
{
int debug = BGP_DEBUG(vpn, VPN_LEAK_FROM_VRF);
const struct prefix *p = bgp_dest_get_prefix(path_vrf->net);
afi_t afi = family2afi(p->family);
safi_t safi = SAFI_MPLS_VPN;
struct bgp_path_info *bpi;
struct bgp_dest *bn;
const char *debugmsg;
if (debug) {
zlog_debug(
"%s: entry: leak-from=%s, p=%pBD, type=%d, sub_type=%d",
__func__, bgp_vrf->name_pretty, path_vrf->net,
path_vrf->type, path_vrf->sub_type);
}
if (!bgp_vpn)
return;
if (!afi) {
if (debug)
zlog_debug("%s: can't get afi of prefix", __func__);
return;
}
/* Is this route exportable into the VPN table? */
if (!is_route_injectable_into_vpn(path_vrf))
return;
if (!vpn_leak_to_vpn_active(bgp_vrf, afi, &debugmsg)) {
if (debug)
zlog_debug("%s: skipping: %s", __func__, debugmsg);
return;
}
if (debug)
zlog_debug("%s: withdrawing (path_vrf=%p)", __func__, path_vrf);
bn = bgp_afi_node_get(bgp_vpn->rib[afi][safi], afi, safi, p,
&(bgp_vrf->vpn_policy[afi].tovpn_rd));
if (!bn)
return;
/*
* vrf -> vpn
* match original bpi imported from
*/
for (bpi = bgp_dest_get_bgp_path_info(bn); bpi; bpi = bpi->next) {
if (bpi->extra && bpi->extra->parent == path_vrf) {
break;
}
}
if (bpi) {
/* withdraw from looped vrfs as well */
vpn_leak_to_vrf_withdraw(bgp_vpn, bpi);
bgp_aggregate_decrement(bgp_vpn, p, bpi, afi, safi);
bgp_path_info_delete(bn, bpi);
bgp_process(bgp_vpn, bn, afi, safi);
}
bgp_dest_unlock_node(bn);
}
void vpn_leak_from_vrf_withdraw_all(struct bgp *bgp_vpn, /* to */
struct bgp *bgp_vrf, /* from */
afi_t afi)
{
int debug = BGP_DEBUG(vpn, VPN_LEAK_FROM_VRF);
struct bgp_dest *pdest;
safi_t safi = SAFI_MPLS_VPN;
/*
* Walk vpn table, delete bpi with bgp_orig == bgp_vrf
*/
for (pdest = bgp_table_top(bgp_vpn->rib[afi][safi]); pdest;
pdest = bgp_route_next(pdest)) {
struct bgp_table *table;
struct bgp_dest *bn;
struct bgp_path_info *bpi;