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|
/*
*
* Copyright 2009-2016, LabN Consulting, L.L.C.
*
*
* This program 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
* of the License, or (at your option) any later version.
*
* This program 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
*/
/*
* File: rfapi_import.c
* Purpose: Handle import of routes from BGP to RFAPI
*/
#include "lib/zebra.h"
#include "lib/prefix.h"
#include "lib/agg_table.h"
#include "lib/vty.h"
#include "lib/memory.h"
#include "lib/log.h"
#include "lib/skiplist.h"
#include "lib/thread.h"
#include "lib/stream.h"
#include "lib/lib_errors.h"
#include "bgpd/bgpd.h"
#include "bgpd/bgp_ecommunity.h"
#include "bgpd/bgp_attr.h"
#include "bgpd/bgp_route.h"
#include "bgpd/bgp_mplsvpn.h" /* prefix_rd2str() */
#include "bgpd/bgp_vnc_types.h"
#include "bgpd/bgp_rd.h"
#include "bgpd/rfapi/rfapi.h"
#include "bgpd/rfapi/bgp_rfapi_cfg.h"
#include "bgpd/rfapi/rfapi_backend.h"
#include "bgpd/rfapi/rfapi_import.h"
#include "bgpd/rfapi/rfapi_private.h"
#include "bgpd/rfapi/rfapi_monitor.h"
#include "bgpd/rfapi/rfapi_nve_addr.h"
#include "bgpd/rfapi/rfapi_vty.h"
#include "bgpd/rfapi/vnc_export_bgp.h"
#include "bgpd/rfapi/vnc_export_bgp_p.h"
#include "bgpd/rfapi/vnc_zebra.h"
#include "bgpd/rfapi/vnc_import_bgp.h"
#include "bgpd/rfapi/vnc_import_bgp_p.h"
#include "bgpd/rfapi/rfapi_rib.h"
#include "bgpd/rfapi/rfapi_encap_tlv.h"
#include "bgpd/rfapi/vnc_debug.h"
#ifdef HAVE_GLIBC_BACKTRACE
/* for backtrace and friends */
#include <execinfo.h>
#endif /* HAVE_GLIBC_BACKTRACE */
#undef DEBUG_MONITOR_MOVE_SHORTER
#undef DEBUG_RETURNED_NHL
#undef DEBUG_ROUTE_COUNTERS
#undef DEBUG_ENCAP_MONITOR
#undef DEBUG_L2_EXTRA
#undef DEBUG_IT_NODES
#undef DEBUG_BI_SEARCH
/*
* Allocated for each withdraw timer instance; freed when the timer
* expires or is canceled
*/
struct rfapi_withdraw {
struct rfapi_import_table *import_table;
struct agg_node *node;
struct bgp_path_info *info;
safi_t safi; /* used only for bulk operations */
/*
* For import table node reference count checking (i.e., debugging).
* Normally when a timer expires, lockoffset should be 0. However, if
* the timer expiration function is called directly (e.g.,
* rfapiExpireVpnNow), the node could be locked by a preceding
* agg_route_top() or agg_route_next() in a loop, so we need to pass
* this value in.
*/
int lockoffset;
};
/*
* DEBUG FUNCTION
* It's evil and fiendish. It's compiler-dependent.
* ? Might need LDFLAGS -rdynamic to produce all function names
*/
void rfapiDebugBacktrace(void)
{
#ifdef HAVE_GLIBC_BACKTRACE
#define RFAPI_DEBUG_BACKTRACE_NENTRIES 200
void *buf[RFAPI_DEBUG_BACKTRACE_NENTRIES];
char **syms;
size_t i;
size_t size;
size = backtrace(buf, RFAPI_DEBUG_BACKTRACE_NENTRIES);
syms = backtrace_symbols(buf, size);
for (i = 0; i < size && i < RFAPI_DEBUG_BACKTRACE_NENTRIES; ++i) {
vnc_zlog_debug_verbose("backtrace[%2zu]: %s", i, syms[i]);
}
free(syms);
#else
#endif
}
/*
* DEBUG FUNCTION
* Count remote routes and compare with actively-maintained values.
* Abort if they disagree.
*/
void rfapiCheckRouteCount(void)
{
struct bgp *bgp = bgp_get_default();
struct rfapi *h;
struct rfapi_import_table *it;
afi_t afi;
assert(bgp);
h = bgp->rfapi;
assert(h);
for (it = h->imports; it; it = it->next) {
for (afi = AFI_IP; afi < AFI_MAX; ++afi) {
struct agg_table *rt;
struct agg_node *rn;
int holddown_count = 0;
int local_count = 0;
int imported_count = 0;
int remote_count = 0;
rt = it->imported_vpn[afi];
for (rn = agg_route_top(rt); rn;
rn = agg_route_next(rn)) {
struct bgp_path_info *bpi;
struct bgp_path_info *next;
for (bpi = rn->info; bpi; bpi = next) {
next = bpi->next;
if (CHECK_FLAG(bpi->flags,
BGP_PATH_REMOVED)) {
++holddown_count;
} else {
if (RFAPI_LOCAL_BI(bpi)) {
++local_count;
} else {
if (RFAPI_DIRECT_IMPORT_BI(
bpi)) {
++imported_count;
} else {
++remote_count;
}
}
}
}
}
if (it->holddown_count[afi] != holddown_count) {
vnc_zlog_debug_verbose(
"%s: it->holddown_count %d != holddown_count %d",
__func__, it->holddown_count[afi],
holddown_count);
assert(0);
}
if (it->remote_count[afi] != remote_count) {
vnc_zlog_debug_verbose(
"%s: it->remote_count %d != remote_count %d",
__func__, it->remote_count[afi],
remote_count);
assert(0);
}
if (it->imported_count[afi] != imported_count) {
vnc_zlog_debug_verbose(
"%s: it->imported_count %d != imported_count %d",
__func__, it->imported_count[afi],
imported_count);
assert(0);
}
}
}
}
#ifdef DEBUG_ROUTE_COUNTERS
#define VNC_ITRCCK do {rfapiCheckRouteCount();} while (0)
#else
#define VNC_ITRCCK
#endif
/*
* Validate reference count for a node in an import table
*
* Normally lockoffset is 0 for nodes in quiescent state. However,
* agg_unlock_node will delete the node if it is called when
* node->lock == 1, and we have to validate the refcount before
* the node is deleted. In this case, we specify lockoffset 1.
*/
void rfapiCheckRefcount(struct agg_node *rn, safi_t safi, int lockoffset)
{
unsigned int count_bpi = 0;
unsigned int count_monitor = 0;
struct bgp_path_info *bpi;
struct rfapi_monitor_encap *hme;
struct rfapi_monitor_vpn *hmv;
for (bpi = rn->info; bpi; bpi = bpi->next)
++count_bpi;
if (rn->aggregate) {
++count_monitor; /* rfapi_it_extra */
switch (safi) {
void *cursor;
int rc;
case SAFI_ENCAP:
for (hme = RFAPI_MONITOR_ENCAP(rn); hme;
hme = hme->next)
++count_monitor;
break;
case SAFI_MPLS_VPN:
for (hmv = RFAPI_MONITOR_VPN(rn); hmv; hmv = hmv->next)
++count_monitor;
if (RFAPI_MONITOR_EXTERIOR(rn)->source) {
++count_monitor; /* sl */
cursor = NULL;
for (rc = skiplist_next(
RFAPI_MONITOR_EXTERIOR(rn)->source,
NULL, NULL, &cursor);
!rc;
rc = skiplist_next(
RFAPI_MONITOR_EXTERIOR(rn)->source,
NULL, NULL, &cursor)) {
++count_monitor; /* sl entry */
}
}
break;
default:
assert(0);
}
}
if (count_bpi + count_monitor + lockoffset != rn->lock) {
vnc_zlog_debug_verbose(
"%s: count_bpi=%d, count_monitor=%d, lockoffset=%d, rn->lock=%d",
__func__, count_bpi, count_monitor, lockoffset,
rn->lock);
assert(0);
}
}
/*
* Perform deferred rfapi_close operations that were queued
* during callbacks.
*/
static wq_item_status rfapi_deferred_close_workfunc(struct work_queue *q,
void *data)
{
struct rfapi_descriptor *rfd = data;
struct rfapi *h = q->spec.data;
assert(!(h->flags & RFAPI_INCALLBACK));
rfapi_close(rfd);
vnc_zlog_debug_verbose("%s: completed deferred close on handle %p",
__func__, rfd);
return WQ_SUCCESS;
}
/*
* Extract layer 2 option from Encap TLVS in BGP attrs
*/
int rfapiGetL2o(struct attr *attr, struct rfapi_l2address_option *l2o)
{
if (attr) {
struct bgp_attr_encap_subtlv *pEncap;
for (pEncap = attr->vnc_subtlvs; pEncap;
pEncap = pEncap->next) {
if (pEncap->type == BGP_VNC_SUBTLV_TYPE_RFPOPTION) {
if (pEncap->value[0]
== RFAPI_VN_OPTION_TYPE_L2ADDR) {
if (pEncap->value[1] == 14) {
memcpy(l2o->macaddr.octet,
pEncap->value + 2,
ETH_ALEN);
l2o->label =
((pEncap->value[10]
>> 4)
& 0x0f)
+ ((pEncap->value[9]
<< 4)
& 0xff0)
+ ((pEncap->value[8]
<< 12)
& 0xff000);
l2o->local_nve_id =
pEncap->value[12];
l2o->logical_net_id =
(pEncap->value[15]
& 0xff)
+ ((pEncap->value[14]
<< 8)
& 0xff00)
+ ((pEncap->value[13]
<< 16)
& 0xff0000);
}
return 0;
}
}
}
}
return ENOENT;
}
/*
* Extract the lifetime from the Tunnel Encap attribute of a route in
* an import table
*/
int rfapiGetVncLifetime(struct attr *attr, uint32_t *lifetime)
{
struct bgp_attr_encap_subtlv *pEncap;
*lifetime = RFAPI_INFINITE_LIFETIME; /* default to infinite */
if (attr) {
for (pEncap = attr->vnc_subtlvs; pEncap;
pEncap = pEncap->next) {
if (pEncap->type
== BGP_VNC_SUBTLV_TYPE_LIFETIME) { /* lifetime */
if (pEncap->length == 4) {
memcpy(lifetime, pEncap->value, 4);
*lifetime = ntohl(*lifetime);
return 0;
}
}
}
}
return ENOENT;
}
/*
* Look for UN address in Encap attribute
*/
int rfapiGetVncTunnelUnAddr(struct attr *attr, struct prefix *p)
{
struct bgp_attr_encap_subtlv *pEncap;
bgp_encap_types tun_type = BGP_ENCAP_TYPE_MPLS;/*Default tunnel type*/
bgp_attr_extcom_tunnel_type(attr, &tun_type);
if (tun_type == BGP_ENCAP_TYPE_MPLS) {
if (!p)
return 0;
/* MPLS carries UN address in next hop */
rfapiNexthop2Prefix(attr, p);
if (p->family != 0)
return 0;
return ENOENT;
}
if (attr) {
for (pEncap = attr->encap_subtlvs; pEncap;
pEncap = pEncap->next) {
if (pEncap->type
== BGP_ENCAP_SUBTLV_TYPE_REMOTE_ENDPOINT) { /* un
addr
*/
switch (pEncap->length) {
case 8:
if (p) {
p->family = AF_INET;
p->prefixlen = 32;
memcpy(p->u.val, pEncap->value,
4);
}
return 0;
case 20:
if (p) {
p->family = AF_INET6;
p->prefixlen = 128;
memcpy(p->u.val, pEncap->value,
16);
}
return 0;
}
}
}
}
return ENOENT;
}
/*
* Get UN address wherever it might be
*/
int rfapiGetUnAddrOfVpnBi(struct bgp_path_info *bpi, struct prefix *p)
{
/* If it's in this route's VNC attribute, we're done */
if (!rfapiGetVncTunnelUnAddr(bpi->attr, p))
return 0;
/*
* Otherwise, see if it's cached from a corresponding ENCAP SAFI
* advertisement
*/
if (bpi->extra) {
switch (bpi->extra->vnc.import.un_family) {
case AF_INET:
if (p) {
p->family = bpi->extra->vnc.import.un_family;
p->u.prefix4 = bpi->extra->vnc.import.un.addr4;
p->prefixlen = 32;
}
return 0;
case AF_INET6:
if (p) {
p->family = bpi->extra->vnc.import.un_family;
p->u.prefix6 = bpi->extra->vnc.import.un.addr6;
p->prefixlen = 128;
}
return 0;
default:
if (p)
p->family = 0;
#ifdef DEBUG_ENCAP_MONITOR
vnc_zlog_debug_verbose(
"%s: bpi->extra->vnc.import.un_family is 0, no UN addr",
__func__);
#endif
break;
}
}
return ENOENT;
}
/*
* Make a new bgp_path_info from gathered parameters
*/
static struct bgp_path_info *rfapiBgpInfoCreate(struct attr *attr,
struct peer *peer, void *rfd,
struct prefix_rd *prd,
uint8_t type, uint8_t sub_type,
uint32_t *label)
{
struct bgp_path_info *new;
new = info_make(type, sub_type, 0, peer, attr, NULL);
new->attr = bgp_attr_intern(attr);
bgp_path_info_extra_get(new);
if (prd) {
new->extra->vnc.import.rd = *prd;
rfapi_time(&new->extra->vnc.import.create_time);
}
if (label)
encode_label(*label, &new->extra->label[0]);
peer_lock(peer);
return new;
}
/*
* Frees bgp_path_info as used in import tables (parts are not
* allocated exactly the way they are in the main RIBs)
*/
static void rfapiBgpInfoFree(struct bgp_path_info *goner)
{
if (!goner)
return;
if (goner->peer) {
vnc_zlog_debug_verbose("%s: calling peer_unlock(%p), #%d",
__func__, goner->peer,
goner->peer->lock);
peer_unlock(goner->peer);
}
bgp_attr_unintern(&goner->attr);
if (goner->extra)
bgp_path_info_extra_free(&goner->extra);
XFREE(MTYPE_BGP_ROUTE, goner);
}
struct rfapi_import_table *rfapiMacImportTableGetNoAlloc(struct bgp *bgp,
uint32_t lni)
{
struct rfapi *h;
struct rfapi_import_table *it = NULL;
uintptr_t lni_as_ptr = lni;
h = bgp->rfapi;
if (!h)
return NULL;
if (!h->import_mac)
return NULL;
if (skiplist_search(h->import_mac, (void *)lni_as_ptr, (void **)&it))
return NULL;
return it;
}
struct rfapi_import_table *rfapiMacImportTableGet(struct bgp *bgp, uint32_t lni)
{
struct rfapi *h;
struct rfapi_import_table *it = NULL;
uintptr_t lni_as_ptr = lni;
h = bgp->rfapi;
assert(h);
if (!h->import_mac) {
/* default cmp is good enough for LNI */
h->import_mac = skiplist_new(0, NULL, NULL);
}
if (skiplist_search(h->import_mac, (void *)lni_as_ptr, (void **)&it)) {
struct ecommunity *enew;
struct ecommunity_val eval;
afi_t afi;
it = XCALLOC(MTYPE_RFAPI_IMPORTTABLE,
sizeof(struct rfapi_import_table));
/* set RT list of new import table based on LNI */
memset((char *)&eval, 0, sizeof(eval));
eval.val[0] = 0; /* VNC L2VPN */
eval.val[1] = 2; /* VNC L2VPN */
eval.val[5] = (lni >> 16) & 0xff;
eval.val[6] = (lni >> 8) & 0xff;
eval.val[7] = (lni >> 0) & 0xff;
enew = ecommunity_new();
ecommunity_add_val(enew, &eval);
it->rt_import_list = enew;
for (afi = AFI_IP; afi < AFI_MAX; ++afi) {
it->imported_vpn[afi] = agg_table_init();
it->imported_encap[afi] = agg_table_init();
}
it->l2_logical_net_id = lni;
skiplist_insert(h->import_mac, (void *)lni_as_ptr, it);
}
assert(it);
return it;
}
/*
* Implement MONITOR_MOVE_SHORTER(original_node) from
* RFAPI-Import-Event-Handling.txt
*
* Returns pointer to the list of moved monitors
*/
static struct rfapi_monitor_vpn *
rfapiMonitorMoveShorter(struct agg_node *original_vpn_node, int lockoffset)
{
struct bgp_path_info *bpi;
struct agg_node *par;
struct rfapi_monitor_vpn *m;
struct rfapi_monitor_vpn *mlast;
struct rfapi_monitor_vpn *moved;
int movecount = 0;
int parent_already_refcounted = 0;
RFAPI_CHECK_REFCOUNT(original_vpn_node, SAFI_MPLS_VPN, lockoffset);
#ifdef DEBUG_MONITOR_MOVE_SHORTER
{
char buf[PREFIX_STRLEN];
prefix2str(&original_vpn_node->p, buf, sizeof(buf));
vnc_zlog_debug_verbose("%s: called with node pfx=%s", __func__,
buf);
}
#endif
/*
* 1. If there is at least one bpi (either regular route or
* route marked as withdrawn, with a pending timer) at
* original_node with a valid UN address, we're done. Return.
*/
for (bpi = original_vpn_node->info; bpi; bpi = bpi->next) {
struct prefix pfx;
if (!rfapiGetUnAddrOfVpnBi(bpi, &pfx)) {
#ifdef DEBUG_MONITOR_MOVE_SHORTER
vnc_zlog_debug_verbose(
"%s: have valid UN at original node, no change",
__func__);
#endif
return NULL;
}
}
/*
* 2. Travel up the tree (toward less-specific prefixes) from
* original_node to find the first node that has at least
* one route (even if it is only a withdrawn route) with a
* valid UN address. Call this node "Node P."
*/
for (par = agg_node_parent(original_vpn_node); par;
par = agg_node_parent(par)) {
for (bpi = par->info; bpi; bpi = bpi->next) {
struct prefix pfx;
if (!rfapiGetUnAddrOfVpnBi(bpi, &pfx)) {
break;
}
}
if (bpi)
break;
}
if (par) {
RFAPI_CHECK_REFCOUNT(par, SAFI_MPLS_VPN, 0);
}
/*
* If no less-specific routes, try to use the 0/0 node
*/
if (!par) {
/* this isn't necessarily 0/0 */
par = agg_route_table_top(original_vpn_node);
/*
* If we got the top node but it wasn't 0/0,
* ignore it
*/
if (par && par->p.prefixlen) {
agg_unlock_node(par); /* maybe free */
par = NULL;
}
if (par) {
++parent_already_refcounted;
}
}
/*
* Create 0/0 node if it isn't there
*/
if (!par) {
struct prefix pfx_default;
memset(&pfx_default, 0, sizeof(pfx_default));
pfx_default.family = original_vpn_node->p.family;
/* creates default node if none exists */
par = agg_node_get(agg_get_table(original_vpn_node),
&pfx_default);
++parent_already_refcounted;
}
/*
* 3. Move each of the monitors found at original_node to Node P.
* These are "Moved Monitors."
*
*/
/*
* Attach at end so that the list pointer we return points
* only to the moved routes
*/
for (m = RFAPI_MONITOR_VPN(par), mlast = NULL; m;
mlast = m, m = m->next)
;
if (mlast) {
moved = mlast->next = RFAPI_MONITOR_VPN(original_vpn_node);
} else {
moved = RFAPI_MONITOR_VPN_W_ALLOC(par) =
RFAPI_MONITOR_VPN(original_vpn_node);
}
if (RFAPI_MONITOR_VPN(
original_vpn_node)) /* check agg, so not allocated */
RFAPI_MONITOR_VPN_W_ALLOC(original_vpn_node) = NULL;
/*
* update the node pointers on the monitors
*/
for (m = moved; m; m = m->next) {
++movecount;
m->node = par;
}
RFAPI_CHECK_REFCOUNT(par, SAFI_MPLS_VPN,
parent_already_refcounted - movecount);
while (movecount > parent_already_refcounted) {
agg_lock_node(par);
++parent_already_refcounted;
}
while (movecount < parent_already_refcounted) {
/* unlikely, but code defensively */
agg_unlock_node(par);
--parent_already_refcounted;
}
RFAPI_CHECK_REFCOUNT(original_vpn_node, SAFI_MPLS_VPN,
movecount + lockoffset);
while (movecount--) {
agg_unlock_node(original_vpn_node);
}
#ifdef DEBUG_MONITOR_MOVE_SHORTER
{
char buf[PREFIX_STRLEN];
prefix2str(&par->p, buf, sizeof(buf));
vnc_zlog_debug_verbose("%s: moved to node pfx=%s", __func__,
buf);
}
#endif
return moved;
}
/*
* Implement MONITOR_MOVE_LONGER(new_node) from
* RFAPI-Import-Event-Handling.txt
*/
static void rfapiMonitorMoveLonger(struct agg_node *new_vpn_node)
{
struct rfapi_monitor_vpn *monitor;
struct rfapi_monitor_vpn *mlast;
struct bgp_path_info *bpi;
struct agg_node *par;
RFAPI_CHECK_REFCOUNT(new_vpn_node, SAFI_MPLS_VPN, 0);
/*
* Make sure we have at least one valid route at the new node
*/
for (bpi = new_vpn_node->info; bpi; bpi = bpi->next) {
struct prefix pfx;
if (!rfapiGetUnAddrOfVpnBi(bpi, &pfx))
break;
}
if (!bpi) {
vnc_zlog_debug_verbose(
"%s: no valid routes at node %p, so not attempting moves",
__func__, new_vpn_node);
return;
}
/*
* Find first parent node that has monitors
*/
for (par = agg_node_parent(new_vpn_node); par;
par = agg_node_parent(par)) {
if (RFAPI_MONITOR_VPN(par))
break;
}
if (!par) {
vnc_zlog_debug_verbose(
"%s: no parent nodes with monitors, done", __func__);
return;
}
/*
* Check each of these monitors to see of their longest-match
* is now the updated node. Move any such monitors to the more-
* specific updated node
*/
for (mlast = NULL, monitor = RFAPI_MONITOR_VPN(par); monitor;) {
/*
* If new longest match for monitor prefix is the new
* route's prefix, move monitor to new route's prefix
*/
if (prefix_match(&new_vpn_node->p, &monitor->p)) {
/* detach */
if (mlast) {
mlast->next = monitor->next;
} else {
RFAPI_MONITOR_VPN_W_ALLOC(par) = monitor->next;
}
/* attach */
monitor->next = RFAPI_MONITOR_VPN(new_vpn_node);
RFAPI_MONITOR_VPN_W_ALLOC(new_vpn_node) = monitor;
monitor->node = new_vpn_node;
agg_lock_node(new_vpn_node); /* incr refcount */
monitor = mlast ? mlast->next : RFAPI_MONITOR_VPN(par);
RFAPI_CHECK_REFCOUNT(par, SAFI_MPLS_VPN, 1);
/* decr refcount after we're done with par as this might
* free it */
agg_unlock_node(par);
continue;
}
mlast = monitor;
monitor = monitor->next;
}
RFAPI_CHECK_REFCOUNT(new_vpn_node, SAFI_MPLS_VPN, 0);
}
static void rfapiBgpInfoChainFree(struct bgp_path_info *bpi)
{
struct bgp_path_info *next;
while (bpi) {
/*
* If there is a timer waiting to delete this bpi, cancel
* the timer and delete immediately
*/
if (CHECK_FLAG(bpi->flags, BGP_PATH_REMOVED)
&& bpi->extra->vnc.import.timer) {
struct thread *t =
(struct thread *)bpi->extra->vnc.import.timer;
struct rfapi_withdraw *wcb = t->arg;
XFREE(MTYPE_RFAPI_WITHDRAW, wcb);
thread_cancel(t);
}
next = bpi->next;
bpi->next = NULL;
rfapiBgpInfoFree(bpi);
bpi = next;
}
}
static void rfapiImportTableFlush(struct rfapi_import_table *it)
{
afi_t afi;
/*
* Free ecommunity
*/
ecommunity_free(&it->rt_import_list);
it->rt_import_list = NULL;
for (afi = AFI_IP; afi < AFI_MAX; ++afi) {
struct agg_node *rn;
for (rn = agg_route_top(it->imported_vpn[afi]); rn;
rn = agg_route_next(rn)) {
/*
* Each route_node has:
* aggregate: points to rfapi_it_extra with monitor
* chain(s)
* info: points to chain of bgp_path_info
*/
/* free bgp_path_info and its children */
rfapiBgpInfoChainFree(rn->info);
rn->info = NULL;
rfapiMonitorExtraFlush(SAFI_MPLS_VPN, rn);
}
for (rn = agg_route_top(it->imported_encap[afi]); rn;
rn = agg_route_next(rn)) {
/* free bgp_path_info and its children */
rfapiBgpInfoChainFree(rn->info);
rn->info = NULL;
rfapiMonitorExtraFlush(SAFI_ENCAP, rn);
}
agg_table_finish(it->imported_vpn[afi]);
agg_table_finish(it->imported_encap[afi]);
}
if (it->monitor_exterior_orphans) {
skiplist_free(it->monitor_exterior_orphans);
}
}
void rfapiImportTableRefDelByIt(struct bgp *bgp,
struct rfapi_import_table *it_target)
{
struct rfapi *h;
struct rfapi_import_table *it;
struct rfapi_import_table *prev = NULL;
assert(it_target);
h = bgp->rfapi;
assert(h);
for (it = h->imports; it; prev = it, it = it->next) {
if (it == it_target)
break;
}
assert(it);
assert(it->refcount);
it->refcount -= 1;
if (!it->refcount) {
if (prev) {
prev->next = it->next;
} else {
h->imports = it->next;
}
rfapiImportTableFlush(it);
XFREE(MTYPE_RFAPI_IMPORTTABLE, it);
}
}
#ifdef RFAPI_REQUIRE_ENCAP_BEEC
/*
* Look for magic BGP Encapsulation Extended Community value
* Format in RFC 5512 Sect. 4.5
*/
static int rfapiEcommunitiesMatchBeec(struct ecommunity *ecom,
bgp_encap_types type)
{
int i;
if (!ecom)
return 0;
for (i = 0; i < (ecom->size * ECOMMUNITY_SIZE); i += ECOMMUNITY_SIZE) {
uint8_t *ep;
ep = ecom->val + i;
if (ep[0] == ECOMMUNITY_ENCODE_OPAQUE
&& ep[1] == ECOMMUNITY_OPAQUE_SUBTYPE_ENCAP
&& ep[6] == ((type && 0xff00) >> 8)
&& ep[7] == (type & 0xff)) {
return 1;
}
}
return 0;
}
#endif
int rfapiEcommunitiesIntersect(struct ecommunity *e1, struct ecommunity *e2)
{
int i, j;
if (!e1 || !e2)
return 0;
{
char *s1, *s2;
s1 = ecommunity_ecom2str(e1, ECOMMUNITY_FORMAT_DISPLAY, 0);
s2 = ecommunity_ecom2str(e2, ECOMMUNITY_FORMAT_DISPLAY, 0);
vnc_zlog_debug_verbose("%s: e1[%s], e2[%s]", __func__, s1, s2);
XFREE(MTYPE_ECOMMUNITY_STR, s1);
XFREE(MTYPE_ECOMMUNITY_STR, s2);
}
for (i = 0; i < e1->size; ++i) {
for (j = 0; j < e2->size; ++j) {
if (!memcmp(e1->val + (i * ECOMMUNITY_SIZE),
e2->val + (j * ECOMMUNITY_SIZE),
ECOMMUNITY_SIZE)) {
return 1;
}
}
}
return 0;
}
int rfapiEcommunityGetLNI(struct ecommunity *ecom, uint32_t *lni)
{
if (ecom) {
int i;
for (i = 0; i < ecom->size; ++i) {
uint8_t *p = ecom->val + (i * ECOMMUNITY_SIZE);
if ((*(p + 0) == 0x00) && (*(p + 1) == 0x02)) {
*lni = (*(p + 5) << 16) | (*(p + 6) << 8)
| (*(p + 7));
return 0;
}
}
}
return ENOENT;
}
int rfapiEcommunityGetEthernetTag(struct ecommunity *ecom, uint16_t *tag_id)
{
struct bgp *bgp = bgp_get_default();
*tag_id = 0; /* default to untagged */
if (ecom) {
int i;
for (i = 0; i < ecom->size; ++i) {
as_t as = 0;
int encode = 0;
const uint8_t *p = ecom->val + (i * ECOMMUNITY_SIZE);
/* High-order octet of type. */
encode = *p++;
if (*p++ == ECOMMUNITY_ROUTE_TARGET) {
if (encode == ECOMMUNITY_ENCODE_AS4) {
p = ptr_get_be32(p, &as);
} else if (encode == ECOMMUNITY_ENCODE_AS) {
as = (*p++ << 8);
as |= (*p++);
p += 2; /* skip next two, tag/vid
always in lowest bytes */
}
if (as == bgp->as) {
*tag_id = *p++ << 8;
*tag_id |= (*p++);
return 0;
}
}
}
}
return ENOENT;
}
static int rfapiVpnBiNhEqualsPt(struct bgp_path_info *bpi,
struct rfapi_ip_addr *hpt)
{
uint8_t family;
if (!hpt || !bpi)
return 0;
family = BGP_MP_NEXTHOP_FAMILY(bpi->attr->mp_nexthop_len);
if (hpt->addr_family != family)
return 0;
switch (family) {
case AF_INET:
if (bpi->attr->mp_nexthop_global_in.s_addr
!= hpt->addr.v4.s_addr)
return 0;
break;
case AF_INET6:
if (IPV6_ADDR_CMP(&bpi->attr->mp_nexthop_global, &hpt->addr.v6))
return 0;
break;
default:
return 0;
}
return 1;
}
/*
* Compare 2 VPN BIs. Return true if they have the same VN and UN addresses
*/
static int rfapiVpnBiSamePtUn(struct bgp_path_info *bpi1,
struct bgp_path_info *bpi2)
{
struct prefix pfx_un1;
struct prefix pfx_un2;
if (!bpi1 || !bpi2)
return 0;
/*
* VN address comparisons
*/
if (BGP_MP_NEXTHOP_FAMILY(bpi1->attr->mp_nexthop_len)
!= BGP_MP_NEXTHOP_FAMILY(bpi2->attr->mp_nexthop_len)) {
return 0;
}
switch (BGP_MP_NEXTHOP_FAMILY(bpi1->attr->mp_nexthop_len)) {
case AF_INET:
if (bpi1->attr->mp_nexthop_global_in.s_addr
!= bpi2->attr->mp_nexthop_global_in.s_addr)
return 0;
break;
case AF_INET6:
if (IPV6_ADDR_CMP(&bpi1->attr->mp_nexthop_global,
&bpi2->attr->mp_nexthop_global))
return 0;
break;
default:
return 0;
}
memset(&pfx_un1, 0, sizeof(pfx_un1));
memset(&pfx_un2, 0, sizeof(pfx_un2));
/*
* UN address comparisons
*/
if (rfapiGetVncTunnelUnAddr(bpi1->attr, &pfx_un1)) {
if (bpi1->extra) {
pfx_un1.family = bpi1->extra->vnc.import.un_family;
switch (bpi1->extra->vnc.import.un_family) {
case AF_INET:
pfx_un1.u.prefix4 =
bpi1->extra->vnc.import.un.addr4;
break;
case AF_INET6:
pfx_un1.u.prefix6 =
bpi1->extra->vnc.import.un.addr6;
break;
default:
pfx_un1.family = 0;
break;
}
}
}
if (rfapiGetVncTunnelUnAddr(bpi2->attr, &pfx_un2)) {
if (bpi2->extra) {
pfx_un2.family = bpi2->extra->vnc.import.un_family;
switch (bpi2->extra->vnc.import.un_family) {
case AF_INET:
pfx_un2.u.prefix4 =
bpi2->extra->vnc.import.un.addr4;
break;
case AF_INET6:
pfx_un2.u.prefix6 =
bpi2->extra->vnc.import.un.addr6;
break;
default:
pfx_un2.family = 0;
break;
}
}
}
if (pfx_un1.family == 0 || pfx_un2.family == 0)
return 0;
if (pfx_un1.family != pfx_un2.family)
return 0;
switch (pfx_un1.family) {
case AF_INET:
if (!IPV4_ADDR_SAME(&pfx_un1.u.prefix4, &pfx_un2.u.prefix4))
return 0;
break;
case AF_INET6:
if (!IPV6_ADDR_SAME(&pfx_un1.u.prefix6, &pfx_un2.u.prefix6))
return 0;
break;
}
return 1;
}
uint8_t rfapiRfpCost(struct attr *attr)
{
if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_LOCAL_PREF)) {
if (attr->local_pref > 255) {
return 0;
}
return 255 - attr->local_pref;
}
return 255;
}
/*------------------------------------------
* rfapi_extract_l2o
*
* Find Layer 2 options in an option chain
*
* input:
* pHop option chain
*
* output:
* l2o layer 2 options extracted
*
* return value:
* 0 OK
* 1 no options found
*
--------------------------------------------*/
int rfapi_extract_l2o(
struct bgp_tea_options *pHop, /* chain of options */
struct rfapi_l2address_option *l2o) /* return extracted value */
{
struct bgp_tea_options *p;
for (p = pHop; p; p = p->next) {
if ((p->type == RFAPI_VN_OPTION_TYPE_L2ADDR)
&& (p->length >= 8)) {
char *v = p->value;
memcpy(&l2o->macaddr, v, 6);
l2o->label = ((v[6] << 12) & 0xff000)
+ ((v[7] << 4) & 0xff0)
+ ((v[8] >> 4) & 0xf);
l2o->local_nve_id = (uint8_t)v[10];
l2o->logical_net_id =
(v[11] << 16) + (v[12] << 8) + (v[13] << 0);
return 0;
}
}
return 1;
}
static struct rfapi_next_hop_entry *
rfapiRouteInfo2NextHopEntry(struct rfapi_ip_prefix *rprefix,
struct bgp_path_info *bpi, /* route to encode */
uint32_t lifetime, /* use this in nhe */
struct agg_node *rn) /* req for L2 eth addr */
{
struct rfapi_next_hop_entry *new;
int have_vnc_tunnel_un = 0;
#ifdef DEBUG_ENCAP_MONITOR
vnc_zlog_debug_verbose("%s: entry, bpi %p, rn %p", __func__, bpi, rn);
#endif
new = XCALLOC(MTYPE_RFAPI_NEXTHOP, sizeof(struct rfapi_next_hop_entry));
assert(new);
new->prefix = *rprefix;
if (bpi->extra
&& decode_rd_type(bpi->extra->vnc.import.rd.val)
== RD_TYPE_VNC_ETH) {
/* ethernet */
struct rfapi_vn_option *vo;
vo = XCALLOC(MTYPE_RFAPI_VN_OPTION,
sizeof(struct rfapi_vn_option));
assert(vo);
vo->type = RFAPI_VN_OPTION_TYPE_L2ADDR;
memcpy(&vo->v.l2addr.macaddr, &rn->p.u.prefix_eth.octet,
ETH_ALEN);
/* only low 3 bytes of this are significant */
(void)rfapiEcommunityGetLNI(bpi->attr->ecommunity,
&vo->v.l2addr.logical_net_id);
(void)rfapiEcommunityGetEthernetTag(bpi->attr->ecommunity,
&vo->v.l2addr.tag_id);
/* local_nve_id comes from lower byte of RD type */
vo->v.l2addr.local_nve_id = bpi->extra->vnc.import.rd.val[1];
/* label comes from MP_REACH_NLRI label */
vo->v.l2addr.label = decode_label(&bpi->extra->label[0]);
new->vn_options = vo;
/*
* If there is an auxiliary prefix (i.e., host IP address),
* use it as the nexthop prefix instead of the query prefix
*/
if (bpi->extra->vnc.import.aux_prefix.family) {
rfapiQprefix2Rprefix(&bpi->extra->vnc.import.aux_prefix,
&new->prefix);
}
}
bgp_encap_types tun_type = BGP_ENCAP_TYPE_MPLS; /*Default*/
new->prefix.cost = rfapiRfpCost(bpi->attr);
struct bgp_attr_encap_subtlv *pEncap;
switch (BGP_MP_NEXTHOP_FAMILY(bpi->attr->mp_nexthop_len)) {
case AF_INET:
new->vn_address.addr_family = AF_INET;
new->vn_address.addr.v4 = bpi->attr->mp_nexthop_global_in;
break;
case AF_INET6:
new->vn_address.addr_family = AF_INET6;
new->vn_address.addr.v6 = bpi->attr->mp_nexthop_global;
break;
default:
zlog_warn("%s: invalid vpn nexthop length: %d", __func__,
bpi->attr->mp_nexthop_len);
rfapi_free_next_hop_list(new);
return NULL;
}
for (pEncap = bpi->attr->vnc_subtlvs; pEncap; pEncap = pEncap->next) {
switch (pEncap->type) {
case BGP_VNC_SUBTLV_TYPE_LIFETIME:
/* use configured lifetime, not attr lifetime */
break;
default:
zlog_warn("%s: unknown VNC option type %d", __func__,
pEncap->type);
break;
}
}
bgp_attr_extcom_tunnel_type(bpi->attr, &tun_type);
if (tun_type == BGP_ENCAP_TYPE_MPLS) {
struct prefix p;
/* MPLS carries UN address in next hop */
rfapiNexthop2Prefix(bpi->attr, &p);
if (p.family != 0) {
rfapiQprefix2Raddr(&p, &new->un_address);
have_vnc_tunnel_un = 1;
}
}
for (pEncap = bpi->attr->encap_subtlvs; pEncap; pEncap = pEncap->next) {
switch (pEncap->type) {
case BGP_ENCAP_SUBTLV_TYPE_REMOTE_ENDPOINT:
/*
* Overrides ENCAP UN address, if any
*/
switch (pEncap->length) {
case 8:
new->un_address.addr_family = AF_INET;
memcpy(&new->un_address.addr.v4, pEncap->value,
4);
have_vnc_tunnel_un = 1;
break;
case 20:
new->un_address.addr_family = AF_INET6;
memcpy(&new->un_address.addr.v6, pEncap->value,
16);
have_vnc_tunnel_un = 1;
break;
default:
zlog_warn(
"%s: invalid tunnel subtlv UN addr length (%d) for bpi %p",
__func__, pEncap->length, bpi);
}
break;
default:
zlog_warn("%s: unknown Encap Attribute option type %d",
__func__, pEncap->type);
break;
}
}
new->un_options = rfapi_encap_tlv_to_un_option(bpi->attr);
#ifdef DEBUG_ENCAP_MONITOR
vnc_zlog_debug_verbose("%s: line %d: have_vnc_tunnel_un=%d", __func__,
__LINE__, have_vnc_tunnel_un);
#endif
if (!have_vnc_tunnel_un && bpi->extra) {
/*
* use cached UN address from ENCAP route
*/
new->un_address.addr_family = bpi->extra->vnc.import.un_family;
switch (new->un_address.addr_family) {
case AF_INET:
new->un_address.addr.v4 =
bpi->extra->vnc.import.un.addr4;
break;
case AF_INET6:
new->un_address.addr.v6 =
bpi->extra->vnc.import.un.addr6;
break;
default:
zlog_warn("%s: invalid UN addr family (%d) for bpi %p",
__func__, new->un_address.addr_family, bpi);
rfapi_free_next_hop_list(new);
return NULL;
}
}
new->lifetime = lifetime;
return new;
}
int rfapiHasNonRemovedRoutes(struct agg_node *rn)
{
struct bgp_path_info *bpi;
for (bpi = rn->info; bpi; bpi = bpi->next) {
struct prefix pfx;
if (!CHECK_FLAG(bpi->flags, BGP_PATH_REMOVED)
&& (bpi->extra && !rfapiGetUnAddrOfVpnBi(bpi, &pfx))) {
return 1;
}
}
return 0;
}
#ifdef DEBUG_IT_NODES
/*
* DEBUG FUNCTION
*/
void rfapiDumpNode(struct agg_node *rn)
{
struct bgp_path_info *bpi;
vnc_zlog_debug_verbose("%s: rn=%p", __func__, rn);
for (bpi = rn->info; bpi; bpi = bpi->next) {
struct prefix pfx;
int ctrc = rfapiGetUnAddrOfVpnBi(bpi, &pfx);
int nr;
if (!CHECK_FLAG(bpi->flags, BGP_PATH_REMOVED)
&& (bpi->extra && !ctrc)) {
nr = 1;
} else {
nr = 0;
}
vnc_zlog_debug_verbose(
" bpi=%p, nr=%d, flags=0x%x, extra=%p, ctrc=%d", bpi,
nr, bpi->flags, bpi->extra, ctrc);
}
}
#endif
static int rfapiNhlAddNodeRoutes(
struct agg_node *rn, /* in */
struct rfapi_ip_prefix *rprefix, /* in */
uint32_t lifetime, /* in */
int removed, /* in */
struct rfapi_next_hop_entry **head, /* in/out */
struct rfapi_next_hop_entry **tail, /* in/out */
struct rfapi_ip_addr *exclude_vnaddr, /* omit routes to same NVE */
struct agg_node *rfd_rib_node, /* preload this NVE rib node */
struct prefix *pfx_target_original) /* query target */
{
struct bgp_path_info *bpi;
struct rfapi_next_hop_entry *new;
struct prefix pfx_un;
struct skiplist *seen_nexthops;
int count = 0;
int is_l2 = (rn->p.family == AF_ETHERNET);
if (rfd_rib_node) {
struct agg_table *atable = agg_get_table(rfd_rib_node);
struct rfapi_descriptor *rfd;
if (atable) {
rfd = agg_get_table_info(atable);
if (rfapiRibFTDFilterRecentPrefix(rfd, rn,
pfx_target_original))
return 0;
}
}
seen_nexthops =
skiplist_new(0, vnc_prefix_cmp, prefix_free_lists);
for (bpi = rn->info; bpi; bpi = bpi->next) {
struct prefix pfx_vn;
struct prefix *newpfx;
if (removed && !CHECK_FLAG(bpi->flags, BGP_PATH_REMOVED)) {
#ifdef DEBUG_RETURNED_NHL
vnc_zlog_debug_verbose(
"%s: want holddown, this route not holddown, skip",
__func__);
#endif
continue;
}
if (!removed && CHECK_FLAG(bpi->flags, BGP_PATH_REMOVED)) {
continue;
}
if (!bpi->extra) {
continue;
}
/*
* Check for excluded VN address
*/
if (rfapiVpnBiNhEqualsPt(bpi, exclude_vnaddr))
continue;
/*
* Check for VN address (nexthop) copied already
*/
if (is_l2) {
/* L2 routes: semantic nexthop in aux_prefix; VN addr
* ain't it */
pfx_vn = bpi->extra->vnc.import.aux_prefix;
} else {
rfapiNexthop2Prefix(bpi->attr, &pfx_vn);
}
if (!skiplist_search(seen_nexthops, &pfx_vn, NULL)) {
#ifdef DEBUG_RETURNED_NHL
char buf[PREFIX_STRLEN];
prefix2str(&pfx_vn, buf, sizeof(buf));
vnc_zlog_debug_verbose(
"%s: already put VN/nexthop %s, skip", __func__,
buf);
#endif
continue;
}
if (rfapiGetUnAddrOfVpnBi(bpi, &pfx_un)) {
#ifdef DEBUG_ENCAP_MONITOR
vnc_zlog_debug_verbose(
"%s: failed to get UN address of this VPN bpi",
__func__);
#endif
continue;
}
newpfx = prefix_new();
*newpfx = pfx_vn;
skiplist_insert(seen_nexthops, newpfx, newpfx);
new = rfapiRouteInfo2NextHopEntry(rprefix, bpi, lifetime, rn);
if (new) {
if (rfapiRibPreloadBi(rfd_rib_node, &pfx_vn, &pfx_un,
lifetime, bpi)) {
/* duplicate filtered by RIB */
rfapi_free_next_hop_list(new);
new = NULL;
}
}
if (new) {
if (*tail) {
(*tail)->next = new;
} else {
*head = new;
}
*tail = new;
++count;
}
}
skiplist_free(seen_nexthops);
return count;
}
/*
* Breadth-first
*
* omit_node is meant for the situation where we are adding a subtree
* of a parent of some original requested node. The response already
* contains the original requested node, and we don't want to duplicate
* its routes in the list, so we skip it if the right or left node
* matches (of course, we still travel down its child subtrees).
*/
static int rfapiNhlAddSubtree(
struct agg_node *rn, /* in */
uint32_t lifetime, /* in */
struct rfapi_next_hop_entry **head, /* in/out */
struct rfapi_next_hop_entry **tail, /* in/out */
struct agg_node *omit_node, /* in */
struct rfapi_ip_addr *exclude_vnaddr, /* omit routes to same NVE */
struct agg_table *rfd_rib_table, /* preload here */
struct prefix *pfx_target_original) /* query target */
{
struct rfapi_ip_prefix rprefix;
int rcount = 0;
/* FIXME: need to find a better way here to work without sticking our
* hands in node->link */
if (agg_node_left(rn) && agg_node_left(rn) != omit_node) {
if (agg_node_left(rn)->info) {
int count = 0;
struct agg_node *rib_rn = NULL;
rfapiQprefix2Rprefix(&agg_node_left(rn)->p, &rprefix);
if (rfd_rib_table) {
rib_rn = agg_node_get(rfd_rib_table,
&agg_node_left(rn)->p);
}
count = rfapiNhlAddNodeRoutes(
agg_node_left(rn), &rprefix, lifetime, 0, head,
tail, exclude_vnaddr, rib_rn,
pfx_target_original);
if (!count) {
count = rfapiNhlAddNodeRoutes(
agg_node_left(rn), &rprefix, lifetime,
1, head, tail, exclude_vnaddr, rib_rn,
pfx_target_original);
}
rcount += count;
if (rib_rn)
agg_unlock_node(rib_rn);
}
}
if (agg_node_right(rn) && agg_node_right(rn) != omit_node) {
if (agg_node_right(rn)->info) {
int count = 0;
struct agg_node *rib_rn = NULL;
rfapiQprefix2Rprefix(&agg_node_right(rn)->p, &rprefix);
if (rfd_rib_table) {
rib_rn = agg_node_get(rfd_rib_table,
&agg_node_right(rn)->p);
}
count = rfapiNhlAddNodeRoutes(
agg_node_right(rn), &rprefix, lifetime, 0, head,
tail, exclude_vnaddr, rib_rn,
pfx_target_original);
if (!count) {
count = rfapiNhlAddNodeRoutes(
agg_node_right(rn), &rprefix, lifetime,
1, head, tail, exclude_vnaddr, rib_rn,
pfx_target_original);
}
rcount += count;
if (rib_rn)
agg_unlock_node(rib_rn);
}
}
if (agg_node_left(rn)) {
rcount += rfapiNhlAddSubtree(
agg_node_left(rn), lifetime, head, tail, omit_node,
exclude_vnaddr, rfd_rib_table, pfx_target_original);
}
if (agg_node_right(rn)) {
rcount += rfapiNhlAddSubtree(
agg_node_right(rn), lifetime, head, tail, omit_node,
exclude_vnaddr, rfd_rib_table, pfx_target_original);
}
return rcount;
}
/*
* Implementation of ROUTE_LIST(node) from RFAPI-Import-Event-Handling.txt
*
* Construct an rfapi nexthop list based on the routes attached to
* the specified node.
*
* If there are any routes that do NOT have BGP_PATH_REMOVED set,
* return those only. If there are ONLY routes with BGP_PATH_REMOVED,
* then return those, and also include all the non-removed routes from the
* next less-specific node (i.e., this node's parent) at the end.
*/
struct rfapi_next_hop_entry *rfapiRouteNode2NextHopList(
struct agg_node *rn, uint32_t lifetime, /* put into nexthop entries */
struct rfapi_ip_addr *exclude_vnaddr, /* omit routes to same NVE */
struct agg_table *rfd_rib_table, /* preload here */
struct prefix *pfx_target_original) /* query target */
{
struct rfapi_ip_prefix rprefix;
struct rfapi_next_hop_entry *answer = NULL;
struct rfapi_next_hop_entry *last = NULL;
struct agg_node *parent;
int count = 0;
struct agg_node *rib_rn;
#ifdef DEBUG_RETURNED_NHL
{
char buf[PREFIX_STRLEN];
prefix2str(&rn->p, buf, sizeof(buf));
vnc_zlog_debug_verbose("%s: called with node pfx=%s", __func__,
buf);
}
rfapiDebugBacktrace();
#endif
rfapiQprefix2Rprefix(&rn->p, &rprefix);
rib_rn = rfd_rib_table ? agg_node_get(rfd_rib_table, &rn->p) : NULL;
/*
* Add non-withdrawn routes at this node
*/
count = rfapiNhlAddNodeRoutes(rn, &rprefix, lifetime, 0, &answer, &last,
exclude_vnaddr, rib_rn,
pfx_target_original);
/*
* If the list has at least one entry, it's finished
*/
if (count) {
count += rfapiNhlAddSubtree(rn, lifetime, &answer, &last, NULL,
exclude_vnaddr, rfd_rib_table,
pfx_target_original);
vnc_zlog_debug_verbose("%s: %d nexthops, answer=%p", __func__,
count, answer);
#ifdef DEBUG_RETURNED_NHL
rfapiPrintNhl(NULL, answer);
#endif
if (rib_rn)
agg_unlock_node(rib_rn);
return answer;
}
/*
* Add withdrawn routes at this node
*/
count = rfapiNhlAddNodeRoutes(rn, &rprefix, lifetime, 1, &answer, &last,
exclude_vnaddr, rib_rn,
pfx_target_original);
if (rib_rn)
agg_unlock_node(rib_rn);
// rfapiPrintNhl(NULL, answer);
/*
* walk up the tree until we find a node with non-deleted
* routes, then add them
*/
for (parent = agg_node_parent(rn); parent;
parent = agg_node_parent(parent)) {
if (rfapiHasNonRemovedRoutes(parent)) {
break;
}
}
/*
* Add non-withdrawn routes from less-specific prefix
*/
if (parent) {
rib_rn = rfd_rib_table ? agg_node_get(rfd_rib_table, &parent->p)
: NULL;
rfapiQprefix2Rprefix(&parent->p, &rprefix);
count += rfapiNhlAddNodeRoutes(parent, &rprefix, lifetime, 0,
&answer, &last, exclude_vnaddr,
rib_rn, pfx_target_original);
count += rfapiNhlAddSubtree(parent, lifetime, &answer, &last,
rn, exclude_vnaddr, rfd_rib_table,
pfx_target_original);
if (rib_rn)
agg_unlock_node(rib_rn);
} else {
/*
* There is no parent with non-removed routes. Still need to
* add subtree of original node if it contributed routes to the
* answer.
*/
if (count)
count += rfapiNhlAddSubtree(rn, lifetime, &answer,
&last, rn, exclude_vnaddr,
rfd_rib_table,
pfx_target_original);
}
vnc_zlog_debug_verbose("%s: %d nexthops, answer=%p", __func__, count,
answer);
#ifdef DEBUG_RETURNED_NHL
rfapiPrintNhl(NULL, answer);
#endif
return answer;
}
/*
* Construct nexthop list of all routes in table
*/
struct rfapi_next_hop_entry *rfapiRouteTable2NextHopList(
struct agg_table *rt, uint32_t lifetime, /* put into nexthop entries */
struct rfapi_ip_addr *exclude_vnaddr, /* omit routes to same NVE */
struct agg_table *rfd_rib_table, /* preload this NVE rib table */
struct prefix *pfx_target_original) /* query target */
{
struct agg_node *rn;
struct rfapi_next_hop_entry *biglist = NULL;
struct rfapi_next_hop_entry *nhl;
struct rfapi_next_hop_entry *tail = NULL;
int count = 0;
for (rn = agg_route_top(rt); rn; rn = agg_route_next(rn)) {
nhl = rfapiRouteNode2NextHopList(rn, lifetime, exclude_vnaddr,
rfd_rib_table,
pfx_target_original);
if (!tail) {
tail = biglist = nhl;
if (tail)
count = 1;
} else {
tail->next = nhl;
}
if (tail) {
while (tail->next) {
++count;
tail = tail->next;
}
}
}
vnc_zlog_debug_verbose("%s: returning %d routes", __func__, count);
return biglist;
}
struct rfapi_next_hop_entry *rfapiEthRouteNode2NextHopList(
struct agg_node *rn, struct rfapi_ip_prefix *rprefix,
uint32_t lifetime, /* put into nexthop entries */
struct rfapi_ip_addr *exclude_vnaddr, /* omit routes to same NVE */
struct agg_table *rfd_rib_table, /* preload NVE rib table */
struct prefix *pfx_target_original) /* query target */
{
int count = 0;
struct rfapi_next_hop_entry *answer = NULL;
struct rfapi_next_hop_entry *last = NULL;
struct agg_node *rib_rn;
rib_rn = rfd_rib_table ? agg_node_get(rfd_rib_table, &rn->p) : NULL;
count = rfapiNhlAddNodeRoutes(rn, rprefix, lifetime, 0, &answer, &last,
NULL, rib_rn, pfx_target_original);
#ifdef DEBUG_ENCAP_MONITOR
vnc_zlog_debug_verbose("%s: node %p: %d non-holddown routes", __func__,
rn, count);
#endif
if (!count) {
count = rfapiNhlAddNodeRoutes(rn, rprefix, lifetime, 1, &answer,
&last, exclude_vnaddr, rib_rn,
pfx_target_original);
vnc_zlog_debug_verbose("%s: node %p: %d holddown routes",
__func__, rn, count);
}
if (rib_rn)
agg_unlock_node(rib_rn);
#ifdef DEBUG_RETURNED_NHL
rfapiPrintNhl(NULL, answer);
#endif
return answer;
}
/*
* Construct nexthop list of all routes in table
*/
struct rfapi_next_hop_entry *rfapiEthRouteTable2NextHopList(
uint32_t logical_net_id, struct rfapi_ip_prefix *rprefix,
uint32_t lifetime, /* put into nexthop entries */
struct rfapi_ip_addr *exclude_vnaddr, /* omit routes to same NVE */
struct agg_table *rfd_rib_table, /* preload NVE rib node */
struct prefix *pfx_target_original) /* query target */
{
struct rfapi_import_table *it;
struct bgp *bgp = bgp_get_default();
struct agg_table *rt;
struct agg_node *rn;
struct rfapi_next_hop_entry *biglist = NULL;
struct rfapi_next_hop_entry *nhl;
struct rfapi_next_hop_entry *tail = NULL;
int count = 0;
it = rfapiMacImportTableGet(bgp, logical_net_id);
rt = it->imported_vpn[AFI_L2VPN];
for (rn = agg_route_top(rt); rn; rn = agg_route_next(rn)) {
nhl = rfapiEthRouteNode2NextHopList(
rn, rprefix, lifetime, exclude_vnaddr, rfd_rib_table,
pfx_target_original);
if (!tail) {
tail = biglist = nhl;
if (tail)
count = 1;
} else {
tail->next = nhl;
}
if (tail) {
while (tail->next) {
++count;
tail = tail->next;
}
}
}
vnc_zlog_debug_verbose("%s: returning %d routes", __func__, count);
return biglist;
}
/*
* Insert a new bpi to the imported route table node,
* keeping the list of BPIs sorted best route first
*/
static void rfapiBgpInfoAttachSorted(struct agg_node *rn,
struct bgp_path_info *info_new, afi_t afi,
safi_t safi)
{
struct bgp *bgp;
struct bgp_path_info *prev;
struct bgp_path_info *next;
char pfx_buf[PREFIX2STR_BUFFER];
bgp = bgp_get_default(); /* assume 1 instance for now */
if (VNC_DEBUG(IMPORT_BI_ATTACH)) {
vnc_zlog_debug_verbose("%s: info_new->peer=%p", __func__,
info_new->peer);
vnc_zlog_debug_verbose("%s: info_new->peer->su_remote=%p",
__func__, info_new->peer->su_remote);
}
for (prev = NULL, next = rn->info; next;
prev = next, next = next->next) {
enum bgp_path_selection_reason reason;
if (!bgp
|| (!CHECK_FLAG(info_new->flags, BGP_PATH_REMOVED)
&& CHECK_FLAG(next->flags, BGP_PATH_REMOVED))
|| bgp_path_info_cmp_compatible(bgp, info_new, next,
pfx_buf, afi, safi,
&reason)
== -1) { /* -1 if 1st is better */
break;
}
}
vnc_zlog_debug_verbose("%s: prev=%p, next=%p", __func__, prev, next);
if (prev) {
prev->next = info_new;
} else {
rn->info = info_new;
}
info_new->prev = prev;
info_new->next = next;
if (next)
next->prev = info_new;
bgp_attr_intern(info_new->attr);
}
static void rfapiBgpInfoDetach(struct agg_node *rn, struct bgp_path_info *bpi)
{
/*
* Remove the route (doubly-linked)
*/
// bgp_attr_unintern (&bpi->attr);
if (bpi->next)
bpi->next->prev = bpi->prev;
if (bpi->prev)
bpi->prev->next = bpi->next;
else
rn->info = bpi->next;
}
/*
* For L3-indexed import tables
*/
static int rfapi_bi_peer_rd_cmp(void *b1, void *b2)
{
struct bgp_path_info *bpi1 = b1;
struct bgp_path_info *bpi2 = b2;
/*
* Compare peers
*/
if (bpi1->peer < bpi2->peer)
return -1;
if (bpi1->peer > bpi2->peer)
return 1;
/*
* compare RDs
*/
return vnc_prefix_cmp((struct prefix *)&bpi1->extra->vnc.import.rd,
(struct prefix *)&bpi2->extra->vnc.import.rd);
}
/*
* For L2-indexed import tables
* The BPIs in these tables should ALWAYS have an aux_prefix set because
* they arrive via IPv4 or IPv6 advertisements.
*/
static int rfapi_bi_peer_rd_aux_cmp(void *b1, void *b2)
{
struct bgp_path_info *bpi1 = b1;
struct bgp_path_info *bpi2 = b2;
int rc;
/*
* Compare peers
*/
if (bpi1->peer < bpi2->peer)
return -1;
if (bpi1->peer > bpi2->peer)
return 1;
/*
* compare RDs
*/
rc = vnc_prefix_cmp((struct prefix *)&bpi1->extra->vnc.import.rd,
(struct prefix *)&bpi2->extra->vnc.import.rd);
if (rc) {
return rc;
}
/*
* L2 import tables can have multiple entries with the
* same MAC address, same RD, but different L3 addresses.
*
* Use presence of aux_prefix with AF=ethernet and prefixlen=1
* as magic value to signify explicit wildcarding of the aux_prefix.
* This magic value will not appear in bona fide bpi entries in
* the import table, but is allowed in the "fake" bpi used to
* probe the table when searching. (We have to test both b1 and b2
* because there is no guarantee of the order the test key and
* the real key will be passed)
*/
if ((bpi1->extra->vnc.import.aux_prefix.family == AF_ETHERNET
&& (bpi1->extra->vnc.import.aux_prefix.prefixlen == 1))
|| (bpi2->extra->vnc.import.aux_prefix.family == AF_ETHERNET
&& (bpi2->extra->vnc.import.aux_prefix.prefixlen == 1))) {
/*
* wildcard aux address specified
*/
return 0;
}
return vnc_prefix_cmp(&bpi1->extra->vnc.import.aux_prefix,
&bpi2->extra->vnc.import.aux_prefix);
}
/*
* Index on RD and Peer
*/
static void rfapiItBiIndexAdd(struct agg_node *rn, /* Import table VPN node */
struct bgp_path_info *bpi) /* new BPI */
{
struct skiplist *sl;
assert(rn);
assert(bpi);
assert(bpi->extra);
{
char buf[RD_ADDRSTRLEN];
vnc_zlog_debug_verbose("%s: bpi %p, peer %p, rd %s", __func__,
bpi, bpi->peer,
prefix_rd2str(&bpi->extra->vnc.import.rd,
buf, sizeof(buf)));
}
sl = RFAPI_RDINDEX_W_ALLOC(rn);
if (!sl) {
if (AF_ETHERNET == rn->p.family) {
sl = skiplist_new(0, rfapi_bi_peer_rd_aux_cmp, NULL);
} else {
sl = skiplist_new(0, rfapi_bi_peer_rd_cmp, NULL);
}
RFAPI_IT_EXTRA_GET(rn)->u.vpn.idx_rd = sl;
agg_lock_node(rn); /* for skiplist */
}
assert(!skiplist_insert(sl, (void *)bpi, (void *)bpi));
agg_lock_node(rn); /* for skiplist entry */
/* NB: BPIs in import tables are not refcounted */
}
static void rfapiItBiIndexDump(struct agg_node *rn)
{
struct skiplist *sl;
void *cursor = NULL;
struct bgp_path_info *k;
struct bgp_path_info *v;
int rc;
sl = RFAPI_RDINDEX(rn);
if (!sl)
return;
for (rc = skiplist_next(sl, (void **)&k, (void **)&v, &cursor); !rc;
rc = skiplist_next(sl, (void **)&k, (void **)&v, &cursor)) {
char buf[RD_ADDRSTRLEN];
char buf_aux_pfx[PREFIX_STRLEN];
prefix_rd2str(&k->extra->vnc.import.rd, buf, sizeof(buf));
if (k->extra->vnc.import.aux_prefix.family) {
prefix2str(&k->extra->vnc.import.aux_prefix,
buf_aux_pfx, sizeof(buf_aux_pfx));
} else
strlcpy(buf_aux_pfx, "(none)", sizeof(buf_aux_pfx));
vnc_zlog_debug_verbose("bpi %p, peer %p, rd %s, aux_prefix %s",
k, k->peer, buf, buf_aux_pfx);
}
}
static struct bgp_path_info *rfapiItBiIndexSearch(
struct agg_node *rn, /* Import table VPN node */
struct prefix_rd *prd, struct peer *peer,
struct prefix *aux_prefix) /* optional L3 addr for L2 ITs */
{
struct skiplist *sl;
int rc;
struct bgp_path_info bpi_fake = {0};
struct bgp_path_info_extra bpi_extra = {0};
struct bgp_path_info *bpi_result;
sl = RFAPI_RDINDEX(rn);
if (!sl)
return NULL;
#ifdef DEBUG_BI_SEARCH
{
char buf[RD_ADDRSTRLEN];
char buf_aux_pfx[PREFIX_STRLEN];
if (aux_prefix) {
prefix2str(aux_prefix, buf_aux_pfx,
sizeof(buf_aux_pfx));
} else
strlcpy(buf_aux_pfx, "(nil)", sizeof(buf_aux_pfx));
vnc_zlog_debug_verbose("%s want prd=%s, peer=%p, aux_prefix=%s",
__func__,
prefix_rd2str(prd, buf, sizeof(buf)),
peer, buf_aux_pfx);
rfapiItBiIndexDump(rn);
}
#endif
/* threshold is a WAG */
if (sl->count < 3) {
#ifdef DEBUG_BI_SEARCH
vnc_zlog_debug_verbose("%s: short list algorithm", __func__);
#endif
/* if short list, linear search might be faster */
for (bpi_result = rn->info; bpi_result;
bpi_result = bpi_result->next) {
#ifdef DEBUG_BI_SEARCH
{
char buf[RD_ADDRSTRLEN];
vnc_zlog_debug_verbose(
"%s: bpi has prd=%s, peer=%p", __func__,
prefix_rd2str(&bpi_result->extra->vnc
.import.rd,
buf, sizeof(buf)),
bpi_result->peer);
}
#endif
if (peer == bpi_result->peer
&& !prefix_cmp((struct prefix *)&bpi_result->extra
->vnc.import.rd,
(struct prefix *)prd)) {
#ifdef DEBUG_BI_SEARCH
vnc_zlog_debug_verbose(
"%s: peer and RD same, doing aux_prefix check",
__func__);
#endif
if (!aux_prefix
|| !prefix_cmp(
aux_prefix,
&bpi_result->extra->vnc.import
.aux_prefix)) {
#ifdef DEBUG_BI_SEARCH
vnc_zlog_debug_verbose("%s: match",
__func__);
#endif
break;
}
}
}
return bpi_result;
}
bpi_fake.peer = peer;
bpi_fake.extra = &bpi_extra;
bpi_fake.extra->vnc.import.rd = *(struct prefix_rd *)prd;
if (aux_prefix) {
bpi_fake.extra->vnc.import.aux_prefix = *aux_prefix;
} else {
/* wildcard */
bpi_fake.extra->vnc.import.aux_prefix.family = AF_ETHERNET;
bpi_fake.extra->vnc.import.aux_prefix.prefixlen = 1;
}
rc = skiplist_search(sl, (void *)&bpi_fake, (void *)&bpi_result);
if (rc) {
#ifdef DEBUG_BI_SEARCH
vnc_zlog_debug_verbose("%s: no match", __func__);
#endif
return NULL;
}
#ifdef DEBUG_BI_SEARCH
vnc_zlog_debug_verbose("%s: matched bpi=%p", __func__, bpi_result);
#endif
return bpi_result;
}
static void rfapiItBiIndexDel(struct agg_node *rn, /* Import table VPN node */
struct bgp_path_info *bpi) /* old BPI */
{
struct skiplist *sl;
int rc;
{
char buf[RD_ADDRSTRLEN];
vnc_zlog_debug_verbose("%s: bpi %p, peer %p, rd %s", __func__,
bpi, bpi->peer,
prefix_rd2str(&bpi->extra->vnc.import.rd,
buf, sizeof(buf)));
}
sl = RFAPI_RDINDEX(rn);
assert(sl);
rc = skiplist_delete(sl, (void *)(bpi), (void *)bpi);
if (rc) {
rfapiItBiIndexDump(rn);
}
assert(!rc);
agg_unlock_node(rn); /* for skiplist entry */
/* NB: BPIs in import tables are not refcounted */
}
/*
* Add a backreference at the ENCAP node to the VPN route that
* refers to it
*/
static void
rfapiMonitorEncapAdd(struct rfapi_import_table *import_table,
struct prefix *p, /* VN address */
struct agg_node *vpn_rn, /* VPN node */
struct bgp_path_info *vpn_bpi) /* VPN bpi/route */
{
afi_t afi = family2afi(p->family);
struct agg_node *rn;
struct rfapi_monitor_encap *m;
assert(afi);
rn = agg_node_get(import_table->imported_encap[afi], p); /* locks rn */
assert(rn);
m = XCALLOC(MTYPE_RFAPI_MONITOR_ENCAP,
sizeof(struct rfapi_monitor_encap));
assert(m);
m->node = vpn_rn;
m->bpi = vpn_bpi;
m->rn = rn;
/* insert to encap node's list */
m->next = RFAPI_MONITOR_ENCAP(rn);
if (m->next)
m->next->prev = m;
RFAPI_MONITOR_ENCAP_W_ALLOC(rn) = m;
/* for easy lookup when deleting vpn route */
vpn_bpi->extra->vnc.import.hme = m;
vnc_zlog_debug_verbose(
"%s: it=%p, vpn_bpi=%p, afi=%d, encap rn=%p, setting vpn_bpi->extra->vnc.import.hme=%p",
__func__, import_table, vpn_bpi, afi, rn, m);
RFAPI_CHECK_REFCOUNT(rn, SAFI_ENCAP, 0);
bgp_attr_intern(vpn_bpi->attr);
}
static void rfapiMonitorEncapDelete(struct bgp_path_info *vpn_bpi)
{
/*
* Remove encap monitor
*/
vnc_zlog_debug_verbose("%s: vpn_bpi=%p", __func__, vpn_bpi);
if (vpn_bpi->extra) {
struct rfapi_monitor_encap *hme =
vpn_bpi->extra->vnc.import.hme;
if (hme) {
vnc_zlog_debug_verbose("%s: hme=%p", __func__, hme);
/* Refcount checking takes too long here */
// RFAPI_CHECK_REFCOUNT(hme->rn, SAFI_ENCAP, 0);
if (hme->next)
hme->next->prev = hme->prev;
if (hme->prev)
hme->prev->next = hme->next;
else
RFAPI_MONITOR_ENCAP_W_ALLOC(hme->rn) =
hme->next;
/* Refcount checking takes too long here */
// RFAPI_CHECK_REFCOUNT(hme->rn, SAFI_ENCAP, 1);
/* see if the struct rfapi_it_extra is empty and can be
* freed */
rfapiMonitorExtraPrune(SAFI_ENCAP, hme->rn);
agg_unlock_node(hme->rn); /* decr ref count */
XFREE(MTYPE_RFAPI_MONITOR_ENCAP, hme);
vpn_bpi->extra->vnc.import.hme = NULL;
}
}
}
/*
* quagga lib/thread.h says this must return int even though
* it doesn't do anything with the return value
*/
static int rfapiWithdrawTimerVPN(struct thread *t)
{
struct rfapi_withdraw *wcb = t->arg;
struct bgp_path_info *bpi = wcb->info;
struct bgp *bgp = bgp_get_default();
struct rfapi_monitor_vpn *moved;
afi_t afi;
if (bgp == NULL) {
vnc_zlog_debug_verbose(
"%s: NULL BGP pointer, assume shutdown race condition!!!",
__func__);
return 0;
}
if (CHECK_FLAG(bgp->flags, BGP_FLAG_DELETE_IN_PROGRESS)) {
vnc_zlog_debug_verbose(
"%s: BGP delete in progress, assume shutdown race condition!!!",
__func__);
return 0;
}
assert(wcb->node);
assert(bpi);
assert(wcb->import_table);
assert(bpi->extra);
RFAPI_CHECK_REFCOUNT(wcb->node, SAFI_MPLS_VPN, wcb->lockoffset);
{
char buf[BUFSIZ];
vnc_zlog_debug_verbose(
"%s: removing bpi %p at prefix %s/%d", __func__, bpi,
rfapi_ntop(wcb->node->p.family, &wcb->node->p.u.prefix,
buf, BUFSIZ),
wcb->node->p.prefixlen);
}
/*
* Remove the route (doubly-linked)
*/
if (CHECK_FLAG(bpi->flags, BGP_PATH_VALID)
&& VALID_INTERIOR_TYPE(bpi->type))
RFAPI_MONITOR_EXTERIOR(wcb->node)->valid_interior_count--;
afi = family2afi(wcb->node->p.family);
wcb->import_table->holddown_count[afi] -= 1; /* keep count consistent */
rfapiItBiIndexDel(wcb->node, bpi);
rfapiBgpInfoDetach(wcb->node, bpi); /* with removed bpi */
vnc_import_bgp_exterior_del_route_interior(bgp, wcb->import_table,
wcb->node, bpi);
/*
* If VNC is configured to send response remove messages, AND
* if the removed route had a UN address, do response removal
* processing.
*/
if (!(bgp->rfapi_cfg->flags
& BGP_VNC_CONFIG_RESPONSE_REMOVAL_DISABLE)) {
int has_valid_duplicate = 0;
struct bgp_path_info *bpii;
/*
* First check if there are any OTHER routes at this node
* that have the same nexthop and a valid UN address. If
* there are (e.g., from other peers), then the route isn't
* really gone, so skip sending a response removal message.
*/
for (bpii = wcb->node->info; bpii; bpii = bpii->next) {
if (rfapiVpnBiSamePtUn(bpi, bpii)) {
has_valid_duplicate = 1;
break;
}
}
vnc_zlog_debug_verbose("%s: has_valid_duplicate=%d", __func__,
has_valid_duplicate);
if (!has_valid_duplicate) {
rfapiRibPendingDeleteRoute(bgp, wcb->import_table, afi,
wcb->node);
}
}
rfapiMonitorEncapDelete(bpi);
/*
* If there are no VPN monitors at this VPN Node A,
* we are done
*/
if (!RFAPI_MONITOR_VPN(wcb->node)) {
vnc_zlog_debug_verbose("%s: no VPN monitors at this node",
__func__);
goto done;
}
/*
* rfapiMonitorMoveShorter only moves monitors if there are
* no remaining valid routes at the current node
*/
moved = rfapiMonitorMoveShorter(wcb->node, 1);
if (moved) {
rfapiMonitorMovedUp(wcb->import_table, wcb->node, moved->node,
moved);
}
done:
/*
* Free VPN bpi
*/
rfapiBgpInfoFree(bpi);
wcb->info = NULL;
/*
* If route count at this node has gone to 0, withdraw exported prefix
*/
if (!wcb->node->info) {
/* see if the struct rfapi_it_extra is empty and can be freed */
rfapiMonitorExtraPrune(SAFI_MPLS_VPN, wcb->node);
vnc_direct_bgp_del_prefix(bgp, wcb->import_table, wcb->node);
vnc_zebra_del_prefix(bgp, wcb->import_table, wcb->node);
} else {
/*
* nexthop change event
* vnc_direct_bgp_add_prefix() will recompute the VN addr
* ecommunity
*/
vnc_direct_bgp_add_prefix(bgp, wcb->import_table, wcb->node);
}
RFAPI_CHECK_REFCOUNT(wcb->node, SAFI_MPLS_VPN, 1 + wcb->lockoffset);
agg_unlock_node(wcb->node); /* decr ref count */
XFREE(MTYPE_RFAPI_WITHDRAW, wcb);
return 0;
}
/*
* This works for multiprotocol extension, but not for plain ol'
* unicast IPv4 because that nexthop is stored in attr->nexthop
*/
void rfapiNexthop2Prefix(struct attr *attr, struct prefix *p)
{
assert(p);
assert(attr);
memset(p, 0, sizeof(struct prefix));
switch (p->family = BGP_MP_NEXTHOP_FAMILY(attr->mp_nexthop_len)) {
case AF_INET:
p->u.prefix4 = attr->mp_nexthop_global_in;
p->prefixlen = 32;
break;
case AF_INET6:
p->u.prefix6 = attr->mp_nexthop_global;
p->prefixlen = 128;
break;
default:
vnc_zlog_debug_verbose("%s: Family is unknown = %d", __func__,
p->family);
}
}
void rfapiUnicastNexthop2Prefix(afi_t afi, struct attr *attr, struct prefix *p)
{
if (afi == AFI_IP) {
p->family = AF_INET;
p->prefixlen = 32;
p->u.prefix4 = attr->nexthop;
} else {
rfapiNexthop2Prefix(attr, p);
}
}
static int rfapiAttrNexthopAddrDifferent(struct prefix *p1, struct prefix *p2)
{
if (!p1 || !p2) {
vnc_zlog_debug_verbose("%s: p1 or p2 is NULL", __func__);
return 1;
}
/*
* Are address families the same?
*/
if (p1->family != p2->family) {
return 1;
}
switch (p1->family) {
case AF_INET:
if (IPV4_ADDR_SAME(&p1->u.prefix4, &p2->u.prefix4))
return 0;
break;
case AF_INET6:
if (IPV6_ADDR_SAME(&p1->u.prefix6, &p2->u.prefix6))
return 0;
break;
default:
assert(1);
}
return 1;
}
static void rfapiCopyUnEncap2VPN(struct bgp_path_info *encap_bpi,
struct bgp_path_info *vpn_bpi)
{
if (!vpn_bpi || !vpn_bpi->extra) {
zlog_warn("%s: no vpn bpi attr/extra, can't copy UN address",
__func__);
return;
}
switch (BGP_MP_NEXTHOP_FAMILY(encap_bpi->attr->mp_nexthop_len)) {
case AF_INET:
/*
* instrumentation to debug segfault of 091127
*/
vnc_zlog_debug_verbose("%s: vpn_bpi=%p", __func__, vpn_bpi);
if (vpn_bpi) {
vnc_zlog_debug_verbose("%s: vpn_bpi->extra=%p",
__func__, vpn_bpi->extra);
}
vpn_bpi->extra->vnc.import.un_family = AF_INET;
vpn_bpi->extra->vnc.import.un.addr4 =
encap_bpi->attr->mp_nexthop_global_in;
break;
case AF_INET6:
vpn_bpi->extra->vnc.import.un_family = AF_INET6;
vpn_bpi->extra->vnc.import.un.addr6 =
encap_bpi->attr->mp_nexthop_global;
break;
default:
zlog_warn("%s: invalid encap nexthop length: %d", __func__,
encap_bpi->attr->mp_nexthop_len);
vpn_bpi->extra->vnc.import.un_family = 0;
break;
}
}
/*
* returns 0 on success, nonzero on error
*/
static int
rfapiWithdrawEncapUpdateCachedUn(struct rfapi_import_table *import_table,
struct bgp_path_info *encap_bpi,
struct agg_node *vpn_rn,
struct bgp_path_info *vpn_bpi)
{
if (!encap_bpi) {
/*
* clear cached UN address
*/
if (!vpn_bpi || !vpn_bpi->extra) {
zlog_warn(
"%s: missing VPN bpi/extra, can't clear UN addr",
__func__);
return 1;
}
vpn_bpi->extra->vnc.import.un_family = 0;
memset(&vpn_bpi->extra->vnc.import.un, 0,
sizeof(vpn_bpi->extra->vnc.import.un));
if (CHECK_FLAG(vpn_bpi->flags, BGP_PATH_VALID)) {
if (rfapiGetVncTunnelUnAddr(vpn_bpi->attr, NULL)) {
UNSET_FLAG(vpn_bpi->flags, BGP_PATH_VALID);
if (VALID_INTERIOR_TYPE(vpn_bpi->type))
RFAPI_MONITOR_EXTERIOR(vpn_rn)
->valid_interior_count--;
/* signal interior route withdrawal to
* import-exterior */
vnc_import_bgp_exterior_del_route_interior(
bgp_get_default(), import_table, vpn_rn,
vpn_bpi);
}
}
} else {
if (!vpn_bpi) {
zlog_warn("%s: missing VPN bpi, can't clear UN addr",
__func__);
return 1;
}
rfapiCopyUnEncap2VPN(encap_bpi, vpn_bpi);
if (!CHECK_FLAG(vpn_bpi->flags, BGP_PATH_VALID)) {
SET_FLAG(vpn_bpi->flags, BGP_PATH_VALID);
if (VALID_INTERIOR_TYPE(vpn_bpi->type))
RFAPI_MONITOR_EXTERIOR(vpn_rn)
->valid_interior_count++;
/* signal interior route withdrawal to import-exterior
*/
vnc_import_bgp_exterior_add_route_interior(
bgp_get_default(), import_table, vpn_rn,
vpn_bpi);
}
}
return 0;
}
static int rfapiWithdrawTimerEncap(struct thread *t)
{
struct rfapi_withdraw *wcb = t->arg;
struct bgp_path_info *bpi = wcb->info;
int was_first_route = 0;
struct rfapi_monitor_encap *em;
struct skiplist *vpn_node_sl = skiplist_new(0, NULL, NULL);
assert(wcb->node);
assert(bpi);
assert(wcb->import_table);
RFAPI_CHECK_REFCOUNT(wcb->node, SAFI_ENCAP, 0);
if (wcb->node->info == bpi)
was_first_route = 1;
/*
* Remove the route/bpi and free it
*/
rfapiBgpInfoDetach(wcb->node, bpi);
rfapiBgpInfoFree(bpi);
if (!was_first_route)
goto done;
for (em = RFAPI_MONITOR_ENCAP(wcb->node); em; em = em->next) {
/*
* Update monitoring VPN BPIs with new encap info at the
* head of the encap bpi chain (which could be NULL after
* removing the expiring bpi above)
*/
if (rfapiWithdrawEncapUpdateCachedUn(wcb->import_table,
wcb->node->info, em->node,
em->bpi))
continue;
/*
* Build a list of unique VPN nodes referenced by these
* monitors.
* Use a skiplist for speed.
*/
skiplist_insert(vpn_node_sl, em->node, em->node);
}
/*
* for each VPN node referenced in the ENCAP monitors:
*/
struct agg_node *rn;
while (!skiplist_first(vpn_node_sl, (void **)&rn, NULL)) {
if (!wcb->node->info) {
struct rfapi_monitor_vpn *moved;
moved = rfapiMonitorMoveShorter(rn, 0);
if (moved) {
// rfapiDoRouteCallback(wcb->import_table,
// moved->node, moved);
rfapiMonitorMovedUp(wcb->import_table, rn,
moved->node, moved);
}
} else {
// rfapiDoRouteCallback(wcb->import_table, rn, NULL);
rfapiMonitorItNodeChanged(wcb->import_table, rn, NULL);
}
skiplist_delete_first(vpn_node_sl);
}
done:
RFAPI_CHECK_REFCOUNT(wcb->node, SAFI_ENCAP, 1);
agg_unlock_node(wcb->node); /* decr ref count */
XFREE(MTYPE_RFAPI_WITHDRAW, wcb);
skiplist_free(vpn_node_sl);
return 0;
}
/*
* Works for both VPN and ENCAP routes; timer_service_func is different
* in each case
*/
static void
rfapiBiStartWithdrawTimer(struct rfapi_import_table *import_table,
struct agg_node *rn, struct bgp_path_info *bpi,
afi_t afi, safi_t safi,
int (*timer_service_func)(struct thread *))
{
uint32_t lifetime;
struct rfapi_withdraw *wcb;
if (CHECK_FLAG(bpi->flags, BGP_PATH_REMOVED)) {
/*
* Already on the path to being withdrawn,
* should already have a timer set up to
* delete it.
*/
vnc_zlog_debug_verbose(
"%s: already being withdrawn, do nothing", __func__);
return;
}
rfapiGetVncLifetime(bpi->attr, &lifetime);
vnc_zlog_debug_verbose("%s: VNC lifetime is %u", __func__, lifetime);
/*
* withdrawn routes get to hang around for a while
*/
SET_FLAG(bpi->flags, BGP_PATH_REMOVED);
/* set timer to remove the route later */
lifetime = rfapiGetHolddownFromLifetime(lifetime);
vnc_zlog_debug_verbose("%s: using timeout %u", __func__, lifetime);
/*
* Stash import_table, node, and info for use by timer
* service routine, which is supposed to free the wcb.
*/
wcb = XCALLOC(MTYPE_RFAPI_WITHDRAW, sizeof(struct rfapi_withdraw));
assert(wcb);
wcb->node = rn;
wcb->info = bpi;
wcb->import_table = import_table;
bgp_attr_intern(bpi->attr);
if (VNC_DEBUG(VERBOSE)) {
vnc_zlog_debug_verbose(
"%s: wcb values: node=%p, info=%p, import_table=%p (bpi follows)",
__func__, wcb->node, wcb->info, wcb->import_table);
rfapiPrintBi(NULL, bpi);
}
assert(bpi->extra);
if (lifetime > UINT32_MAX / 1001) {
/* sub-optimal case, but will probably never happen */
bpi->extra->vnc.import.timer = NULL;
thread_add_timer(bm->master, timer_service_func, wcb, lifetime,
&bpi->extra->vnc.import.timer);
} else {
static uint32_t jitter;
uint32_t lifetime_msec;
/*
* the goal here is to spread out the timers so they are
* sortable in the skip list
*/
if (++jitter >= 1000)
jitter = 0;
lifetime_msec = (lifetime * 1000) + jitter;
bpi->extra->vnc.import.timer = NULL;
thread_add_timer_msec(bm->master, timer_service_func, wcb,
lifetime_msec,
&bpi->extra->vnc.import.timer);
}
/* re-sort route list (BGP_PATH_REMOVED routes are last) */
if (((struct bgp_path_info *)rn->info)->next) {
rfapiBgpInfoDetach(rn, bpi);
rfapiBgpInfoAttachSorted(rn, bpi, afi, safi);
}
}
typedef void(rfapi_bi_filtered_import_f)(struct rfapi_import_table *, int,
struct peer *, void *, struct prefix *,
struct prefix *, afi_t,
struct prefix_rd *, struct attr *,
uint8_t, uint8_t, uint32_t *);
static void rfapiExpireEncapNow(struct rfapi_import_table *it,
struct agg_node *rn, struct bgp_path_info *bpi)
{
struct rfapi_withdraw *wcb;
struct thread t;
/*
* pretend we're an expiring timer
*/
wcb = XCALLOC(MTYPE_RFAPI_WITHDRAW, sizeof(struct rfapi_withdraw));
wcb->info = bpi;
wcb->node = rn;
wcb->import_table = it;
memset(&t, 0, sizeof(t));
t.arg = wcb;
rfapiWithdrawTimerEncap(&t); /* frees wcb */
}
static int rfapiGetNexthop(struct attr *attr, struct prefix *prefix)
{
switch (BGP_MP_NEXTHOP_FAMILY(attr->mp_nexthop_len)) {
case AF_INET:
prefix->family = AF_INET;
prefix->prefixlen = 32;
prefix->u.prefix4 = attr->mp_nexthop_global_in;
break;
case AF_INET6:
prefix->family = AF_INET6;
prefix->prefixlen = 128;
prefix->u.prefix6 = attr->mp_nexthop_global;
break;
default:
vnc_zlog_debug_verbose("%s: unknown attr->mp_nexthop_len %d",
__func__, attr->mp_nexthop_len);
return EINVAL;
}
return 0;
}
/*
* import a bgp_path_info if its route target list intersects with the
* import table's route target list
*/
static void rfapiBgpInfoFilteredImportEncap(
struct rfapi_import_table *import_table, int action, struct peer *peer,
void *rfd, /* set for looped back routes */
struct prefix *p,
struct prefix *aux_prefix, /* Unused for encap routes */
afi_t afi, struct prefix_rd *prd,
struct attr *attr, /* part of bgp_path_info */
uint8_t type, /* part of bgp_path_info */
uint8_t sub_type, /* part of bgp_path_info */
uint32_t *label) /* part of bgp_path_info */
{
struct agg_table *rt = NULL;
struct agg_node *rn;
struct bgp_path_info *info_new;
struct bgp_path_info *bpi;
struct bgp_path_info *next;
char buf[BUFSIZ];
struct prefix p_firstbpi_old;
struct prefix p_firstbpi_new;
int replacing = 0;
const char *action_str = NULL;
struct prefix un_prefix;
struct bgp *bgp;
bgp = bgp_get_default(); /* assume 1 instance for now */
switch (action) {
case FIF_ACTION_UPDATE:
action_str = "update";
break;
case FIF_ACTION_WITHDRAW:
action_str = "withdraw";
break;
case FIF_ACTION_KILL:
action_str = "kill";
break;
default:
assert(0);
break;
}
vnc_zlog_debug_verbose(
"%s: entry: %s: prefix %s/%d", __func__, action_str,
inet_ntop(p->family, &p->u.prefix, buf, BUFSIZ), p->prefixlen);
memset(&p_firstbpi_old, 0, sizeof(p_firstbpi_old));
memset(&p_firstbpi_new, 0, sizeof(p_firstbpi_new));
if (action == FIF_ACTION_UPDATE) {
/*
* Compare rt lists. If no intersection, don't import this route
* On a withdraw, peer and RD are sufficient to determine if
* we should act.
*/
if (!attr || !attr->ecommunity) {
vnc_zlog_debug_verbose(
"%s: attr, extra, or ecommunity missing, not importing",
__func__);
return;
}
#ifdef RFAPI_REQUIRE_ENCAP_BEEC
if (!rfapiEcommunitiesMatchBeec(attr->ecommunity)) {
vnc_zlog_debug_verbose(
"%s: it=%p: no match for BGP Encapsulation ecommunity",
__func__, import_table);
return;
}
#endif
if (!rfapiEcommunitiesIntersect(import_table->rt_import_list,
attr->ecommunity)) {
vnc_zlog_debug_verbose(
"%s: it=%p: no ecommunity intersection",
__func__, import_table);
return;
}
/*
* Updates must also have a nexthop address
*/
memset(&un_prefix, 0,
sizeof(un_prefix)); /* keep valgrind happy */
if (rfapiGetNexthop(attr, &un_prefix)) {
vnc_zlog_debug_verbose("%s: missing nexthop address",
__func__);
return;
}
}
/*
* Figure out which radix tree the route would go into
*/
switch (afi) {
case AFI_IP:
case AFI_IP6:
rt = import_table->imported_encap[afi];
break;
default:
flog_err(EC_LIB_DEVELOPMENT, "%s: bad afi %d", __func__, afi);
return;
}
/*
* agg_node_lookup returns a node only if there is at least
* one route attached.
*/
rn = agg_node_lookup(rt, p);
#ifdef DEBUG_ENCAP_MONITOR
vnc_zlog_debug_verbose("%s: initial encap lookup(it=%p) rn=%p",
__func__, import_table, rn);
#endif
if (rn) {
RFAPI_CHECK_REFCOUNT(rn, SAFI_ENCAP, 1);
agg_unlock_node(rn); /* undo lock in agg_node_lookup */
/*
* capture nexthop of first bpi
*/
if (rn->info) {
rfapiNexthop2Prefix(
((struct bgp_path_info *)(rn->info))->attr,
&p_firstbpi_old);
}
for (bpi = rn->info; bpi; bpi = bpi->next) {
/*
* Does this bgp_path_info refer to the same route
* as we are trying to add?
*/
vnc_zlog_debug_verbose("%s: comparing BPI %p", __func__,
bpi);
/*
* Compare RDs
*
* RD of import table bpi is in
* bpi->extra->vnc.import.rd RD of info_orig is in prd
*/
if (!bpi->extra) {
vnc_zlog_debug_verbose("%s: no bpi->extra",
__func__);
continue;
}
if (prefix_cmp(
(struct prefix *)&bpi->extra->vnc.import.rd,
(struct prefix *)prd)) {
vnc_zlog_debug_verbose("%s: prd does not match",
__func__);
continue;
}
/*
* Compare peers
*/
if (bpi->peer != peer) {
vnc_zlog_debug_verbose(
"%s: peer does not match", __func__);
continue;
}
vnc_zlog_debug_verbose("%s: found matching bpi",
__func__);
/* Same route. Delete this bpi, replace with new one */
if (action == FIF_ACTION_WITHDRAW) {
vnc_zlog_debug_verbose(
"%s: withdrawing at prefix %s/%d",
__func__,
inet_ntop(rn->p.family, &rn->p.u.prefix,
buf, BUFSIZ),
rn->p.prefixlen);
rfapiBiStartWithdrawTimer(
import_table, rn, bpi, afi, SAFI_ENCAP,
rfapiWithdrawTimerEncap);
} else {
vnc_zlog_debug_verbose(
"%s: %s at prefix %s/%d", __func__,
((action == FIF_ACTION_KILL)
? "killing"
: "replacing"),
inet_ntop(rn->p.family, &rn->p.u.prefix,
buf, BUFSIZ),
rn->p.prefixlen);
/*
* If this route is waiting to be deleted
* because of
* a previous withdraw, we must cancel its
* timer.
*/
if (CHECK_FLAG(bpi->flags, BGP_PATH_REMOVED)
&& bpi->extra->vnc.import.timer) {
struct thread *t =
(struct thread *)bpi->extra->vnc
.import.timer;
struct rfapi_withdraw *wcb = t->arg;
XFREE(MTYPE_RFAPI_WITHDRAW, wcb);
thread_cancel(t);
}
if (action == FIF_ACTION_UPDATE) {
rfapiBgpInfoDetach(rn, bpi);
rfapiBgpInfoFree(bpi);
replacing = 1;
} else {
/*
* Kill: do export stuff when removing
* bpi
*/
struct rfapi_withdraw *wcb;
struct thread t;
/*
* pretend we're an expiring timer
*/
wcb = XCALLOC(
MTYPE_RFAPI_WITHDRAW,
sizeof(struct rfapi_withdraw));
wcb->info = bpi;
wcb->node = rn;
wcb->import_table = import_table;
memset(&t, 0, sizeof(t));
t.arg = wcb;
rfapiWithdrawTimerEncap(
&t); /* frees wcb */
}
}
break;
}
}
if (rn)
RFAPI_CHECK_REFCOUNT(rn, SAFI_ENCAP, replacing ? 1 : 0);
if (action == FIF_ACTION_WITHDRAW || action == FIF_ACTION_KILL)
return;
info_new =
rfapiBgpInfoCreate(attr, peer, rfd, prd, type, sub_type, NULL);
if (rn) {
if (!replacing)
agg_lock_node(rn); /* incr ref count for new BPI */
} else {
rn = agg_node_get(rt, p);
}
vnc_zlog_debug_verbose(
"%s: (afi=%d, rn=%p) inserting at prefix %s/%d", __func__, afi,
rn, inet_ntop(rn->p.family, &rn->p.u.prefix, buf, BUFSIZ),
rn->p.prefixlen);
rfapiBgpInfoAttachSorted(rn, info_new, afi, SAFI_ENCAP);
/*
* Delete holddown routes from same NVE. See details in
* rfapiBgpInfoFilteredImportVPN()
*/
for (bpi = info_new->next; bpi; bpi = next) {
struct prefix pfx_un;
int un_match = 0;
next = bpi->next;
if (!CHECK_FLAG(bpi->flags, BGP_PATH_REMOVED))
continue;
/*
* We already match the VN address (it is the prefix
* of the route node)
*/
if (!rfapiGetNexthop(bpi->attr, &pfx_un)
&& prefix_same(&pfx_un, &un_prefix)) {
un_match = 1;
}
if (!un_match)
continue;
vnc_zlog_debug_verbose(
"%s: removing holddown bpi matching NVE of new route",
__func__);
if (bpi->extra->vnc.import.timer) {
struct thread *t =
(struct thread *)bpi->extra->vnc.import.timer;
struct rfapi_withdraw *wcb = t->arg;
XFREE(MTYPE_RFAPI_WITHDRAW, wcb);
thread_cancel(t);
}
rfapiExpireEncapNow(import_table, rn, bpi);
}
rfapiNexthop2Prefix(((struct bgp_path_info *)(rn->info))->attr,
&p_firstbpi_new);
/*
* If the nexthop address of the selected Encap route (i.e.,
* the UN address) has changed, then we must update the VPN
* routes that refer to this Encap route and possibly force
* rfapi callbacks.
*/
if (rfapiAttrNexthopAddrDifferent(&p_firstbpi_old, &p_firstbpi_new)) {
struct rfapi_monitor_encap *m;
struct rfapi_monitor_encap *mnext;
struct agg_node *referenced_vpn_prefix;
/*
* Optimized approach: build radix tree on the fly to
* hold list of VPN nodes referenced by the ENCAP monitors
*
* The nodes in this table correspond to prefixes of VPN routes.
* The "info" pointer of the node points to a chain of
* struct rfapi_monitor_encap, each of which refers to a
* specific VPN node.
*/
struct agg_table *referenced_vpn_table;
referenced_vpn_table = agg_table_init();
assert(referenced_vpn_table);
/*
* iterate over the set of monitors at this ENCAP node.
*/
#ifdef DEBUG_ENCAP_MONITOR
vnc_zlog_debug_verbose("%s: examining monitors at rn=%p",
__func__, rn);
#endif
for (m = RFAPI_MONITOR_ENCAP(rn); m; m = m->next) {
/*
* For each referenced bpi/route, copy the ENCAP route's
* nexthop to the VPN route's cached UN address field
* and set
* the address family of the cached UN address field.
*/
rfapiCopyUnEncap2VPN(info_new, m->bpi);
if (!CHECK_FLAG(m->bpi->flags, BGP_PATH_VALID)) {
SET_FLAG(m->bpi->flags, BGP_PATH_VALID);
if (VALID_INTERIOR_TYPE(m->bpi->type))
RFAPI_MONITOR_EXTERIOR(m->node)
->valid_interior_count++;
vnc_import_bgp_exterior_add_route_interior(
bgp, import_table, m->node, m->bpi);
}
/*
* Build a list of unique VPN nodes referenced by these
* monitors
*
* There could be more than one VPN node here with a
* given
* prefix. Those are currently in an unsorted linear
* list
* per prefix.
*/
referenced_vpn_prefix =
agg_node_get(referenced_vpn_table, &m->node->p);
assert(referenced_vpn_prefix);
for (mnext = referenced_vpn_prefix->info; mnext;
mnext = mnext->next) {
if (mnext->node == m->node)
break;
}
if (mnext) {
/*
* already have an entry for this VPN node
*/
agg_unlock_node(referenced_vpn_prefix);
} else {
mnext = XCALLOC(
MTYPE_RFAPI_MONITOR_ENCAP,
sizeof(struct rfapi_monitor_encap));
assert(mnext);
mnext->node = m->node;
mnext->next = referenced_vpn_prefix->info;
referenced_vpn_prefix->info = mnext;
}
}
/*
* for each VPN node referenced in the ENCAP monitors:
*/
for (referenced_vpn_prefix =
agg_route_top(referenced_vpn_table);
referenced_vpn_prefix;
referenced_vpn_prefix =
agg_route_next(referenced_vpn_prefix)) {
while ((m = referenced_vpn_prefix->info)) {
struct agg_node *n;
rfapiMonitorMoveLonger(m->node);
for (n = m->node; n; n = agg_node_parent(n)) {
// rfapiDoRouteCallback(import_table, n,
// NULL);
}
rfapiMonitorItNodeChanged(import_table, m->node,
NULL);
referenced_vpn_prefix->info = m->next;
agg_unlock_node(referenced_vpn_prefix);
XFREE(MTYPE_RFAPI_MONITOR_ENCAP, m);
}
}
agg_table_finish(referenced_vpn_table);
}
RFAPI_CHECK_REFCOUNT(rn, SAFI_ENCAP, 0);
}
static void rfapiExpireVpnNow(struct rfapi_import_table *it,
struct agg_node *rn, struct bgp_path_info *bpi,
int lockoffset)
{
struct rfapi_withdraw *wcb;
struct thread t;
/*
* pretend we're an expiring timer
*/
wcb = XCALLOC(MTYPE_RFAPI_WITHDRAW, sizeof(struct rfapi_withdraw));
wcb->info = bpi;
wcb->node = rn;
wcb->import_table = it;
wcb->lockoffset = lockoffset;
memset(&t, 0, sizeof(t));
t.arg = wcb;
rfapiWithdrawTimerVPN(&t); /* frees wcb */
}
/*
* import a bgp_path_info if its route target list intersects with the
* import table's route target list
*/
void rfapiBgpInfoFilteredImportVPN(
struct rfapi_import_table *import_table, int action, struct peer *peer,
void *rfd, /* set for looped back routes */
struct prefix *p,
struct prefix *aux_prefix, /* AFI_L2VPN: optional IP */
afi_t afi, struct prefix_rd *prd,
struct attr *attr, /* part of bgp_path_info */
uint8_t type, /* part of bgp_path_info */
uint8_t sub_type, /* part of bgp_path_info */
uint32_t *label) /* part of bgp_path_info */
{
struct agg_table *rt = NULL;
struct agg_node *rn;
struct agg_node *n;
struct bgp_path_info *info_new;
struct bgp_path_info *bpi;
struct bgp_path_info *next;
char buf[BUFSIZ];
struct prefix vn_prefix;
struct prefix un_prefix;
int un_prefix_valid = 0;
struct agg_node *ern;
int replacing = 0;
int original_had_routes = 0;
struct prefix original_nexthop;
const char *action_str = NULL;
int is_it_ce = 0;
struct bgp *bgp;
bgp = bgp_get_default(); /* assume 1 instance for now */
switch (action) {
case FIF_ACTION_UPDATE:
action_str = "update";
break;
case FIF_ACTION_WITHDRAW:
action_str = "withdraw";
break;
case FIF_ACTION_KILL:
action_str = "kill";
break;
default:
assert(0);
break;
}
if (import_table == bgp->rfapi->it_ce)
is_it_ce = 1;
vnc_zlog_debug_verbose("%s: entry: %s%s: prefix %s/%d: it %p, afi %s",
__func__, (is_it_ce ? "CE-IT " : ""), action_str,
rfapi_ntop(p->family, &p->u.prefix, buf, BUFSIZ),
p->prefixlen, import_table, afi2str(afi));
VNC_ITRCCK;
/*
* Compare rt lists. If no intersection, don't import this route
* On a withdraw, peer and RD are sufficient to determine if
* we should act.
*/
if (action == FIF_ACTION_UPDATE) {
if (!attr || !attr->ecommunity) {
vnc_zlog_debug_verbose(
"%s: attr, extra, or ecommunity missing, not importing",
__func__);
return;
}
if ((import_table != bgp->rfapi->it_ce)
&& !rfapiEcommunitiesIntersect(import_table->rt_import_list,
attr->ecommunity)) {
vnc_zlog_debug_verbose(
"%s: it=%p: no ecommunity intersection",
__func__, import_table);
return;
}
memset(&vn_prefix, 0,
sizeof(vn_prefix)); /* keep valgrind happy */
if (rfapiGetNexthop(attr, &vn_prefix)) {
/* missing nexthop address would be a bad, bad thing */
vnc_zlog_debug_verbose("%s: missing nexthop", __func__);
return;
}
}
/*
* Figure out which radix tree the route would go into
*/
switch (afi) {
case AFI_IP:
case AFI_IP6:
case AFI_L2VPN:
rt = import_table->imported_vpn[afi];
break;
default:
flog_err(EC_LIB_DEVELOPMENT, "%s: bad afi %d", __func__, afi);
return;
}
/* clear it */
memset(&original_nexthop, 0, sizeof(original_nexthop));
/*
* agg_node_lookup returns a node only if there is at least
* one route attached.
*/
rn = agg_node_lookup(rt, p);
vnc_zlog_debug_verbose("%s: rn=%p", __func__, rn);
if (rn) {
RFAPI_CHECK_REFCOUNT(rn, SAFI_MPLS_VPN, 1);
agg_unlock_node(rn); /* undo lock in agg_node_lookup */
if (rn->info)
original_had_routes = 1;
if (VNC_DEBUG(VERBOSE)) {
vnc_zlog_debug_verbose("%s: showing IT node on entry",
__func__);
rfapiShowItNode(NULL, rn); /* debug */
}
/*
* Look for same route (will have same RD and peer)
*/
bpi = rfapiItBiIndexSearch(rn, prd, peer, aux_prefix);
if (bpi) {
/*
* This was an old test when we iterated over the
* BPIs linearly. Since we're now looking up with
* RD and peer, comparing types should not be
* needed. Changed to assertion.
*
* Compare types. Doing so prevents a RFP-originated
* route from matching an imported route, for example.
*/
if (VNC_DEBUG(VERBOSE) && bpi->type != type)
/* should be handled by RDs, but warn for now */
zlog_warn("%s: type mismatch! (bpi=%d, arg=%d)",
__func__, bpi->type, type);
vnc_zlog_debug_verbose("%s: found matching bpi",
__func__);
/*
* In the special CE table, withdrawals occur without
* holddown
*/
if (import_table == bgp->rfapi->it_ce) {
vnc_direct_bgp_del_route_ce(bgp, rn, bpi);
if (action == FIF_ACTION_WITHDRAW)
action = FIF_ACTION_KILL;
}
if (action == FIF_ACTION_WITHDRAW) {
int washolddown = CHECK_FLAG(bpi->flags,
BGP_PATH_REMOVED);
vnc_zlog_debug_verbose(
"%s: withdrawing at prefix %s/%d%s",
__func__, rfapi_ntop(rn->p.family,
&rn->p.u.prefix,
buf, BUFSIZ),
rn->p.prefixlen,
(washolddown
? " (already being withdrawn)"
: ""));
VNC_ITRCCK;
if (!washolddown) {
rfapiBiStartWithdrawTimer(
import_table, rn, bpi, afi,
SAFI_MPLS_VPN,
rfapiWithdrawTimerVPN);
RFAPI_UPDATE_ITABLE_COUNT(
bpi, import_table, afi, -1);
import_table->holddown_count[afi] += 1;
}
VNC_ITRCCK;
} else {
vnc_zlog_debug_verbose(
"%s: %s at prefix %s/%d", __func__,
((action == FIF_ACTION_KILL)
? "killing"
: "replacing"),
rfapi_ntop(rn->p.family,
&rn->p.u.prefix, buf,
BUFSIZ),
rn->p.prefixlen);
/*
* If this route is waiting to be deleted
* because of
* a previous withdraw, we must cancel its
* timer.
*/
if (CHECK_FLAG(bpi->flags, BGP_PATH_REMOVED)
&& bpi->extra->vnc.import.timer) {
struct thread *t =
(struct thread *)bpi->extra->vnc
.import.timer;
struct rfapi_withdraw *wcb = t->arg;
XFREE(MTYPE_RFAPI_WITHDRAW, wcb);
thread_cancel(t);
import_table->holddown_count[afi] -= 1;
RFAPI_UPDATE_ITABLE_COUNT(
bpi, import_table, afi, 1);
}
/*
* decrement remote count (if route is remote)
* because
* we are going to remove it below
*/
RFAPI_UPDATE_ITABLE_COUNT(bpi, import_table,
afi, -1);
if (action == FIF_ACTION_UPDATE) {
replacing = 1;
/*
* make copy of original nexthop so we
* can see if it changed
*/
rfapiGetNexthop(bpi->attr,
&original_nexthop);
/*
* remove bpi without doing any export
* processing
*/
if (CHECK_FLAG(bpi->flags,
BGP_PATH_VALID)
&& VALID_INTERIOR_TYPE(bpi->type))
RFAPI_MONITOR_EXTERIOR(rn)
->valid_interior_count--;
rfapiItBiIndexDel(rn, bpi);
rfapiBgpInfoDetach(rn, bpi);
rfapiMonitorEncapDelete(bpi);
vnc_import_bgp_exterior_del_route_interior(
bgp, import_table, rn, bpi);
rfapiBgpInfoFree(bpi);
} else {
/* Kill */
/*
* remove bpi and do export processing
*/
import_table->holddown_count[afi] += 1;
rfapiExpireVpnNow(import_table, rn, bpi,
0);
}
}
}
}
if (rn)
RFAPI_CHECK_REFCOUNT(rn, SAFI_MPLS_VPN, replacing ? 1 : 0);
if (action == FIF_ACTION_WITHDRAW || action == FIF_ACTION_KILL) {
VNC_ITRCCK;
return;
}
info_new =
rfapiBgpInfoCreate(attr, peer, rfd, prd, type, sub_type, label);
/*
* lookup un address in encap table
*/
ern = agg_node_match(import_table->imported_encap[afi], &vn_prefix);
if (ern) {
rfapiCopyUnEncap2VPN(ern->info, info_new);
agg_unlock_node(ern); /* undo lock in route_note_match */
} else {
char bpf[PREFIX_STRLEN];
prefix2str(&vn_prefix, bpf, sizeof(bpf));
/* Not a big deal, just means VPN route got here first */
vnc_zlog_debug_verbose("%s: no encap route for vn addr %s",
__func__, bpf);
info_new->extra->vnc.import.un_family = 0;
}
if (rn) {
if (!replacing)
agg_lock_node(rn);
} else {
/*
* No need to increment reference count, so only "get"
* if the node is not there already
*/
rn = agg_node_get(rt, p);
}
/*
* For ethernet routes, if there is an accompanying IP address,
* save it in the bpi
*/
if ((AFI_L2VPN == afi) && aux_prefix) {
vnc_zlog_debug_verbose("%s: setting BPI's aux_prefix",
__func__);
info_new->extra->vnc.import.aux_prefix = *aux_prefix;
}
vnc_zlog_debug_verbose(
"%s: inserting bpi %p at prefix %s/%d #%d", __func__, info_new,
rfapi_ntop(rn->p.family, &rn->p.u.prefix, buf, BUFSIZ),
rn->p.prefixlen, rn->lock);
rfapiBgpInfoAttachSorted(rn, info_new, afi, SAFI_MPLS_VPN);
rfapiItBiIndexAdd(rn, info_new);
if (!rfapiGetUnAddrOfVpnBi(info_new, NULL)) {
if (VALID_INTERIOR_TYPE(info_new->type))
RFAPI_MONITOR_EXTERIOR(rn)->valid_interior_count++;
SET_FLAG(info_new->flags, BGP_PATH_VALID);
}
RFAPI_UPDATE_ITABLE_COUNT(info_new, import_table, afi, 1);
vnc_import_bgp_exterior_add_route_interior(bgp, import_table, rn,
info_new);
if (import_table == bgp->rfapi->it_ce)
vnc_direct_bgp_add_route_ce(bgp, rn, info_new);
if (VNC_DEBUG(VERBOSE)) {
vnc_zlog_debug_verbose("%s: showing IT node", __func__);
rfapiShowItNode(NULL, rn); /* debug */
}
rfapiMonitorEncapAdd(import_table, &vn_prefix, rn, info_new);
if (!rfapiGetUnAddrOfVpnBi(info_new, &un_prefix)) {
/*
* if we have a valid UN address (either via Encap route
* or via tunnel attribute), then we should attempt
* to move any monitors at less-specific nodes to this node
*/
rfapiMonitorMoveLonger(rn);
un_prefix_valid = 1;
}
/*
* 101129 Enhancement: if we add a route (implication: it is not
* in holddown), delete all other routes from this nve at this
* node that are in holddown, regardless of peer.
*
* Reasons it's OK to do that:
*
* - if the holddown route being deleted originally came from BGP VPN,
* it is already gone from BGP (implication of holddown), so there
* won't be any added inconsistency with the BGP RIB.
*
* - once a fresh route is added at a prefix, any routes in holddown
* at that prefix will not show up in RFP responses, so deleting
* the holddown routes won't affect the contents of responses.
*
* - lifetimes are supposed to be consistent, so there should not
* be a case where the fresh route has a shorter lifetime than
* the holddown route, so we don't expect the fresh route to
* disappear and complete its holddown time before the existing
* holddown routes time out. Therefore, we won't have a situation
* where we expect the existing holddown routes to be hidden and
* then to reappear sometime later (as holddown routes) in a
* RFP response.
*
* Among other things, this would enable us to skirt the problem
* of local holddown routes that refer to NVE descriptors that
* have already been closed (if the same NVE triggers a subsequent
* rfapi_open(), the new peer is different and doesn't match the
* peer of the holddown route, so the stale holddown route still
* hangs around until it times out instead of just being replaced
* by the fresh route).
*/
/*
* We know that the new bpi will have been inserted before any routes
* in holddown, so we can skip any that came before it
*/
for (bpi = info_new->next; bpi; bpi = next) {
struct prefix pfx_vn;
struct prefix pfx_un;
int un_match = 0;
int remote_peer_match = 0;
next = bpi->next;
/*
* Must be holddown
*/
if (!CHECK_FLAG(bpi->flags, BGP_PATH_REMOVED))
continue;
/*
* Must match VN address (nexthop of VPN route)
*/
if (rfapiGetNexthop(bpi->attr, &pfx_vn))
continue;
if (!prefix_same(&pfx_vn, &vn_prefix))
continue;
if (un_prefix_valid && /* new route UN addr */
!rfapiGetUnAddrOfVpnBi(bpi, &pfx_un)
&& /* old route UN addr */
prefix_same(&pfx_un, &un_prefix)) { /* compare */
un_match = 1;
}
if (!RFAPI_LOCAL_BI(bpi) && !RFAPI_LOCAL_BI(info_new)
&& sockunion_same(&bpi->peer->su, &info_new->peer->su)) {
/* old & new are both remote, same peer */
remote_peer_match = 1;
}
if (!un_match & !remote_peer_match)
continue;
vnc_zlog_debug_verbose(
"%s: removing holddown bpi matching NVE of new route",
__func__);
if (bpi->extra->vnc.import.timer) {
struct thread *t =
(struct thread *)bpi->extra->vnc.import.timer;
struct rfapi_withdraw *wcb = t->arg;
XFREE(MTYPE_RFAPI_WITHDRAW, wcb);
thread_cancel(t);
}
rfapiExpireVpnNow(import_table, rn, bpi, 0);
}
if (!original_had_routes) {
/*
* We went from 0 usable routes to 1 usable route. Perform the
* "Adding a Route" export process.
*/
vnc_direct_bgp_add_prefix(bgp, import_table, rn);
vnc_zebra_add_prefix(bgp, import_table, rn);
} else {
/*
* Check for nexthop change event
* Note: the prefix_same() test below detects two situations:
* 1. route is replaced, new route has different nexthop
* 2. new route is added (original_nexthop is 0)
*/
struct prefix new_nexthop;
rfapiGetNexthop(attr, &new_nexthop);
if (!prefix_same(&original_nexthop, &new_nexthop)) {
/*
* nexthop change event
* vnc_direct_bgp_add_prefix() will recompute VN addr
* ecommunity
*/
vnc_direct_bgp_add_prefix(bgp, import_table, rn);
}
}
if (!(bgp->rfapi_cfg->flags & BGP_VNC_CONFIG_CALLBACK_DISABLE)) {
for (n = rn; n; n = agg_node_parent(n)) {
// rfapiDoRouteCallback(import_table, n, NULL);
}
rfapiMonitorItNodeChanged(import_table, rn, NULL);
}
RFAPI_CHECK_REFCOUNT(rn, SAFI_MPLS_VPN, 0);
VNC_ITRCCK;
}
static void rfapiBgpInfoFilteredImportBadSafi(
struct rfapi_import_table *import_table, int action, struct peer *peer,
void *rfd, /* set for looped back routes */
struct prefix *p,
struct prefix *aux_prefix, /* AFI_L2VPN: optional IP */
afi_t afi, struct prefix_rd *prd,
struct attr *attr, /* part of bgp_path_info */
uint8_t type, /* part of bgp_path_info */
uint8_t sub_type, /* part of bgp_path_info */
uint32_t *label) /* part of bgp_path_info */
{
vnc_zlog_debug_verbose("%s: Error, bad safi", __func__);
}
static rfapi_bi_filtered_import_f *
rfapiBgpInfoFilteredImportFunction(safi_t safi)
{
switch (safi) {
case SAFI_MPLS_VPN:
return rfapiBgpInfoFilteredImportVPN;
case SAFI_ENCAP:
return rfapiBgpInfoFilteredImportEncap;
default:
/* not expected */
flog_err(EC_LIB_DEVELOPMENT, "%s: bad safi %d", __func__, safi);
return rfapiBgpInfoFilteredImportBadSafi;
}
}
void rfapiProcessUpdate(struct peer *peer,
void *rfd, /* set when looped from RFP/RFAPI */
struct prefix *p, struct prefix_rd *prd,
struct attr *attr, afi_t afi, safi_t safi, uint8_t type,
uint8_t sub_type, uint32_t *label)
{
struct bgp *bgp;
struct rfapi *h;
struct rfapi_import_table *it;
int has_ip_route = 1;
uint32_t lni = 0;
bgp = bgp_get_default(); /* assume 1 instance for now */
assert(bgp);
h = bgp->rfapi;
assert(h);
/*
* look at high-order byte of RD. FF means MAC
* address is present (VNC L2VPN)
*/
if ((safi == SAFI_MPLS_VPN)
&& (decode_rd_type(prd->val) == RD_TYPE_VNC_ETH)) {
struct prefix pfx_mac_buf;
struct prefix pfx_nexthop_buf;
int rc;
/*
* Set flag if prefix and nexthop are the same - don't
* add the route to normal IP-based import tables
*/
if (!rfapiGetNexthop(attr, &pfx_nexthop_buf)) {
if (!prefix_cmp(&pfx_nexthop_buf, p)) {
has_ip_route = 0;
}
}
memset(&pfx_mac_buf, 0, sizeof(pfx_mac_buf));
pfx_mac_buf.family = AF_ETHERNET;
pfx_mac_buf.prefixlen = 48;
memcpy(&pfx_mac_buf.u.prefix_eth.octet, prd->val + 2, 6);
/*
* Find rt containing LNI (Logical Network ID), which
* _should_ always be present when mac address is present
*/
rc = rfapiEcommunityGetLNI(attr->ecommunity, &lni);
vnc_zlog_debug_verbose(
"%s: rfapiEcommunityGetLNI returned %d, lni=%d, attr=%p",
__func__, rc, lni, attr);
if (!rc) {
it = rfapiMacImportTableGet(bgp, lni);
rfapiBgpInfoFilteredImportVPN(
it, FIF_ACTION_UPDATE, peer, rfd,
&pfx_mac_buf, /* prefix */
p, /* aux prefix: IP addr */
AFI_L2VPN, prd, attr, type, sub_type, label);
}
}
if (!has_ip_route)
return;
/*
* Iterate over all import tables; do a filtered import
* for the afi/safi combination
*/
for (it = h->imports; it; it = it->next) {
(*rfapiBgpInfoFilteredImportFunction(safi))(
it, FIF_ACTION_UPDATE, peer, rfd, p, /* prefix */
NULL, afi, prd, attr, type, sub_type, label);
}
if (safi == SAFI_MPLS_VPN) {
vnc_direct_bgp_rh_add_route(bgp, afi, p, peer, attr);
rfapiBgpInfoFilteredImportVPN(
bgp->rfapi->it_ce, FIF_ACTION_UPDATE, peer, rfd,
p, /* prefix */
NULL, afi, prd, attr, type, sub_type, label);
}
}
void rfapiProcessWithdraw(struct peer *peer, void *rfd, struct prefix *p,
struct prefix_rd *prd, struct attr *attr, afi_t afi,
safi_t safi, uint8_t type, int kill)
{
struct bgp *bgp;
struct rfapi *h;
struct rfapi_import_table *it;
bgp = bgp_get_default(); /* assume 1 instance for now */
assert(bgp);
h = bgp->rfapi;
assert(h);
/*
* look at high-order byte of RD. FF means MAC
* address is present (VNC L2VPN)
*/
if (h->import_mac != NULL && safi == SAFI_MPLS_VPN
&& decode_rd_type(prd->val) == RD_TYPE_VNC_ETH) {
struct prefix pfx_mac_buf;
void *cursor = NULL;
int rc;
memset(&pfx_mac_buf, 0, sizeof(pfx_mac_buf));
pfx_mac_buf.family = AF_ETHERNET;
pfx_mac_buf.prefixlen = 48;
memcpy(&pfx_mac_buf.u.prefix_eth, prd->val + 2, 6);
/*
* withdraw does not contain attrs, so we don't have
* access to the route's LNI, which would ordinarily
* select the specific mac-based import table. Instead,
* we must iterate over all mac-based tables and rely
* on the RD to match.
*
* If this approach is too slow, add an index where
* key is {RD, peer} and value is the import table
*/
for (rc = skiplist_next(h->import_mac, NULL, (void **)&it,
&cursor);
rc == 0; rc = skiplist_next(h->import_mac, NULL,
(void **)&it, &cursor)) {
#ifdef DEBUG_L2_EXTRA
vnc_zlog_debug_verbose(
"%s: calling rfapiBgpInfoFilteredImportVPN(it=%p, afi=AFI_L2VPN)",
__func__, it);
#endif
rfapiBgpInfoFilteredImportVPN(
it,
(kill ? FIF_ACTION_KILL : FIF_ACTION_WITHDRAW),
peer, rfd, &pfx_mac_buf, /* prefix */
p, /* aux_prefix: IP */
AFI_L2VPN, prd, attr, type, 0,
NULL); /* sub_type & label unused for withdraw
*/
}
}
/*
* XXX For the case where the withdraw involves an L2
* route with no IP information, we rely on the lack
* of RT-list intersection to filter out the withdraw
* from the IP-based import tables below
*/
/*
* Iterate over all import tables; do a filtered import
* for the afi/safi combination
*/
for (it = h->imports; it; it = it->next) {
(*rfapiBgpInfoFilteredImportFunction(safi))(
it, (kill ? FIF_ACTION_KILL : FIF_ACTION_WITHDRAW),
peer, rfd, p, /* prefix */
NULL, afi, prd, attr, type, 0,
NULL); /* sub_type & label unused for withdraw */
}
/* TBD the deletion should happen after the lifetime expires */
if (safi == SAFI_MPLS_VPN)
vnc_direct_bgp_rh_del_route(bgp, afi, p, peer);
if (safi == SAFI_MPLS_VPN) {
rfapiBgpInfoFilteredImportVPN(
bgp->rfapi->it_ce,
(kill ? FIF_ACTION_KILL : FIF_ACTION_WITHDRAW), peer,
rfd, p, /* prefix */
NULL, afi, prd, attr, type, 0,
NULL); /* sub_type & label unused for withdraw */
}
}
/*
* TBD optimized withdraw timer algorithm for case of many
* routes expiring at the same time due to peer drop.
*/
/*
* 1. Visit all BPIs in all ENCAP import tables.
*
* a. If a bpi's peer is the failed peer, remove the bpi.
* b. If the removed ENCAP bpi was first in the list of
* BPIs at this ENCAP node, loop over all monitors
* at this node:
*
* (1) for each ENCAP monitor, loop over all its
* VPN node monitors and set their RFAPI_MON_FLAG_NEEDCALLBACK
* flags.
*
* 2. Visit all BPIs in all VPN import tables.
* a. If a bpi's peer is the failed peer, remove the bpi.
* b. loop over all the VPN node monitors and set their
* RFAPI_MON_FLAG_NEEDCALLBACK flags
* c. If there are no BPIs left at this VPN node,
*
*/
/* surprise, this gets called from peer_delete(), from rfapi_close() */
static void rfapiProcessPeerDownRt(struct peer *peer,
struct rfapi_import_table *import_table,
afi_t afi, safi_t safi)
{
struct agg_node *rn;
struct bgp_path_info *bpi;
struct agg_table *rt;
int (*timer_service_func)(struct thread *);
assert(afi == AFI_IP || afi == AFI_IP6);
VNC_ITRCCK;
switch (safi) {
case SAFI_MPLS_VPN:
rt = import_table->imported_vpn[afi];
timer_service_func = rfapiWithdrawTimerVPN;
break;
case SAFI_ENCAP:
rt = import_table->imported_encap[afi];
timer_service_func = rfapiWithdrawTimerEncap;
break;
default:
/* Suppress uninitialized variable warning */
rt = NULL;
timer_service_func = NULL;
assert(0);
}
for (rn = agg_route_top(rt); rn; rn = agg_route_next(rn)) {
for (bpi = rn->info; bpi; bpi = bpi->next) {
if (bpi->peer == peer) {
if (CHECK_FLAG(bpi->flags, BGP_PATH_REMOVED)) {
/* already in holddown, skip */
continue;
}
if (safi == SAFI_MPLS_VPN) {
RFAPI_UPDATE_ITABLE_COUNT(
bpi, import_table, afi, -1);
import_table->holddown_count[afi] += 1;
}
rfapiBiStartWithdrawTimer(import_table, rn, bpi,
afi, safi,
timer_service_func);
}
}
}
VNC_ITRCCK;
}
/*
* This gets called when a peer connection drops. We have to remove
* all the routes from this peer.
*
* Current approach is crude. TBD Optimize by setting fewer timers and
* grouping withdrawn routes so we can generate callbacks more
* efficiently.
*/
void rfapiProcessPeerDown(struct peer *peer)
{
struct bgp *bgp;
struct rfapi *h;
struct rfapi_import_table *it;
/*
* If this peer is a "dummy" peer structure atached to a RFAPI
* nve_descriptor, we don't need to walk the import tables
* because the routes are already withdrawn by rfapi_close()
*/
if (CHECK_FLAG(peer->flags, PEER_FLAG_IS_RFAPI_HD))
return;
/*
* 1. Visit all BPIs in all ENCAP import tables.
* Start withdraw timer on the BPIs that match peer.
*
* 2. Visit All BPIs in all VPN import tables.
* Start withdraw timer on the BPIs that match peer.
*/
bgp = bgp_get_default(); /* assume 1 instance for now */
if (!bgp)
return;
h = bgp->rfapi;
assert(h);
for (it = h->imports; it; it = it->next) {
rfapiProcessPeerDownRt(peer, it, AFI_IP, SAFI_ENCAP);
rfapiProcessPeerDownRt(peer, it, AFI_IP6, SAFI_ENCAP);
rfapiProcessPeerDownRt(peer, it, AFI_IP, SAFI_MPLS_VPN);
rfapiProcessPeerDownRt(peer, it, AFI_IP6, SAFI_MPLS_VPN);
}
if (h->it_ce) {
rfapiProcessPeerDownRt(peer, h->it_ce, AFI_IP, SAFI_MPLS_VPN);
rfapiProcessPeerDownRt(peer, h->it_ce, AFI_IP6, SAFI_MPLS_VPN);
}
}
/*
* Import an entire RIB (for an afi/safi) to an import table RIB,
* filtered according to the import table's RT list
*
* TBD: does this function need additions to match rfapiProcessUpdate()
* for, e.g., L2 handling?
*/
static void rfapiBgpTableFilteredImport(struct bgp *bgp,
struct rfapi_import_table *it,
afi_t afi, safi_t safi)
{
struct bgp_node *rn1;
struct bgp_node *rn2;
/* Only these SAFIs have 2-level RIBS */
assert(safi == SAFI_MPLS_VPN || safi == SAFI_ENCAP);
/*
* Now visit all the rd nodes and the nodes of all the
* route tables attached to them, and import the routes
* if they have matching route targets
*/
for (rn1 = bgp_table_top(bgp->rib[afi][safi]); rn1;
rn1 = bgp_route_next(rn1)) {
if (bgp_node_has_bgp_path_info_data(rn1)) {
for (rn2 = bgp_table_top(bgp_node_get_bgp_table_info(rn1)); rn2;
rn2 = bgp_route_next(rn2)) {
struct bgp_path_info *bpi;
for (bpi = bgp_node_get_bgp_path_info(rn2);
bpi; bpi = bpi->next) {
uint32_t label = 0;
if (CHECK_FLAG(bpi->flags,
BGP_PATH_REMOVED))
continue;
if (bpi->extra)
label = decode_label(
&bpi->extra->label[0]);
(*rfapiBgpInfoFilteredImportFunction(
safi))(
it, /* which import table */
FIF_ACTION_UPDATE, bpi->peer,
NULL, &rn2->p, /* prefix */
NULL, afi,
(struct prefix_rd *)&rn1->p,
bpi->attr, bpi->type,
bpi->sub_type, &label);
}
}
}
}
}
/* per-bgp-instance rfapi data */
struct rfapi *bgp_rfapi_new(struct bgp *bgp)
{
struct rfapi *h;
afi_t afi;
struct rfapi_rfp_cfg *cfg = NULL;
struct rfapi_rfp_cb_methods *cbm = NULL;
assert(bgp->rfapi_cfg == NULL);
h = XCALLOC(MTYPE_RFAPI, sizeof(struct rfapi));
for (afi = AFI_IP; afi < AFI_MAX; afi++) {
h->un[afi] = agg_table_init();
}
/*
* initialize the ce import table
*/
h->it_ce = XCALLOC(MTYPE_RFAPI_IMPORTTABLE,
sizeof(struct rfapi_import_table));
h->it_ce->imported_vpn[AFI_IP] = agg_table_init();
h->it_ce->imported_vpn[AFI_IP6] = agg_table_init();
h->it_ce->imported_encap[AFI_IP] = agg_table_init();
h->it_ce->imported_encap[AFI_IP6] = agg_table_init();
rfapiBgpTableFilteredImport(bgp, h->it_ce, AFI_IP, SAFI_MPLS_VPN);
rfapiBgpTableFilteredImport(bgp, h->it_ce, AFI_IP6, SAFI_MPLS_VPN);
/*
* Set up work queue for deferred rfapi_close operations
*/
h->deferred_close_q =
work_queue_new(bm->master, "rfapi deferred close");
h->deferred_close_q->spec.workfunc = rfapi_deferred_close_workfunc;
h->deferred_close_q->spec.data = h;
h->rfp = rfp_start(bm->master, &cfg, &cbm);
bgp->rfapi_cfg = bgp_rfapi_cfg_new(cfg);
if (cbm != NULL) {
h->rfp_methods = *cbm;
}
return h;
}
void bgp_rfapi_destroy(struct bgp *bgp, struct rfapi *h)
{
afi_t afi;
if (bgp == NULL || h == NULL)
return;
if (h->resolve_nve_nexthop) {
skiplist_free(h->resolve_nve_nexthop);
h->resolve_nve_nexthop = NULL;
}
agg_table_finish(h->it_ce->imported_vpn[AFI_IP]);
agg_table_finish(h->it_ce->imported_vpn[AFI_IP6]);
agg_table_finish(h->it_ce->imported_encap[AFI_IP]);
agg_table_finish(h->it_ce->imported_encap[AFI_IP6]);
if (h->import_mac) {
struct rfapi_import_table *it;
void *cursor;
int rc;
for (cursor = NULL,
rc = skiplist_next(h->import_mac, NULL, (void **)&it,
&cursor);
!rc; rc = skiplist_next(h->import_mac, NULL, (void **)&it,
&cursor)) {
rfapiImportTableFlush(it);
XFREE(MTYPE_RFAPI_IMPORTTABLE, it);
}
skiplist_free(h->import_mac);
h->import_mac = NULL;
}
work_queue_free_and_null(&h->deferred_close_q);
if (h->rfp != NULL)
rfp_stop(h->rfp);
for (afi = AFI_IP; afi < AFI_MAX; afi++) {
agg_table_finish(h->un[afi]);
}
XFREE(MTYPE_RFAPI_IMPORTTABLE, h->it_ce);
XFREE(MTYPE_RFAPI, h);
}
struct rfapi_import_table *
rfapiImportTableRefAdd(struct bgp *bgp, struct ecommunity *rt_import_list,
struct rfapi_nve_group_cfg *rfg)
{
struct rfapi *h;
struct rfapi_import_table *it;
afi_t afi;
h = bgp->rfapi;
assert(h);
for (it = h->imports; it; it = it->next) {
if (ecommunity_cmp(it->rt_import_list, rt_import_list))
break;
}
vnc_zlog_debug_verbose("%s: matched it=%p", __func__, it);
if (!it) {
it = XCALLOC(MTYPE_RFAPI_IMPORTTABLE,
sizeof(struct rfapi_import_table));
assert(it);
it->next = h->imports;
h->imports = it;
it->rt_import_list = ecommunity_dup(rt_import_list);
it->rfg = rfg;
it->monitor_exterior_orphans =
skiplist_new(0, NULL, prefix_free_lists);
/*
* fill import route tables from RIBs
*
* Potential area for optimization. If this occurs when
* tables are large (e.g., the operator adds a nve group
* with a new RT list to a running system), it could take
* a while.
*
*/
for (afi = AFI_IP; afi < AFI_MAX; ++afi) {
it->imported_vpn[afi] = agg_table_init();
it->imported_encap[afi] = agg_table_init();
rfapiBgpTableFilteredImport(bgp, it, afi,
SAFI_MPLS_VPN);
rfapiBgpTableFilteredImport(bgp, it, afi, SAFI_ENCAP);
vnc_import_bgp_exterior_redist_enable_it(bgp, afi, it);
}
}
it->refcount += 1;
return it;
}
/*
* skiplist element free function
*/
static void delete_rem_pfx_na_free(void *na)
{
uint32_t *pCounter = ((struct rfapi_nve_addr *)na)->info;
*pCounter += 1;
XFREE(MTYPE_RFAPI_NVE_ADDR, na);
}
/*
* Common deleter for IP and MAC import tables
*/
static void rfapiDeleteRemotePrefixesIt(
struct bgp *bgp, struct rfapi_import_table *it, struct prefix *un,
struct prefix *vn, struct prefix *p, int delete_active,
int delete_holddown, uint32_t *pARcount, uint32_t *pAHcount,
uint32_t *pHRcount, uint32_t *pHHcount,
struct skiplist *uniq_active_nves, struct skiplist *uniq_holddown_nves)
{
afi_t afi;
#ifdef DEBUG_L2_EXTRA
{
char buf_pfx[PREFIX_STRLEN];
if (p) {
prefix2str(p, buf_pfx, sizeof(buf_pfx));
} else {
buf_pfx[0] = '*';
buf_pfx[1] = 0;
}
vnc_zlog_debug_verbose(
"%s: entry, p=%s, delete_active=%d, delete_holddown=%d",
__func__, buf_pfx, delete_active, delete_holddown);
}
#endif
for (afi = AFI_IP; afi < AFI_MAX; ++afi) {
struct agg_table *rt;
struct agg_node *rn;
if (p && (family2afi(p->family) != afi)) {
continue;
}
rt = it->imported_vpn[afi];
if (!rt)
continue;
vnc_zlog_debug_verbose("%s: scanning rt for afi=%d", __func__,
afi);
for (rn = agg_route_top(rt); rn; rn = agg_route_next(rn)) {
struct bgp_path_info *bpi;
struct bgp_path_info *next;
if (p && VNC_DEBUG(IMPORT_DEL_REMOTE)) {
char p1line[PREFIX_STRLEN];
char p2line[PREFIX_STRLEN];
prefix2str(p, p1line, sizeof(p1line));
prefix2str(&rn->p, p2line, sizeof(p2line));
vnc_zlog_debug_any("%s: want %s, have %s",
__func__, p1line, p2line);
}
if (p && prefix_cmp(p, &rn->p))
continue;
{
char buf_pfx[PREFIX_STRLEN];
prefix2str(&rn->p, buf_pfx, sizeof(buf_pfx));
vnc_zlog_debug_verbose("%s: rn pfx=%s",
__func__, buf_pfx);
}
/* TBD is this valid for afi == AFI_L2VPN? */
RFAPI_CHECK_REFCOUNT(rn, SAFI_MPLS_VPN, 1);
for (bpi = rn->info; bpi; bpi = next) {
next = bpi->next;
struct prefix qpt;
struct prefix qct;
int qpt_valid = 0;
int qct_valid = 0;
int is_active = 0;
vnc_zlog_debug_verbose("%s: examining bpi %p",
__func__, bpi);
if (!rfapiGetNexthop(bpi->attr, &qpt))
qpt_valid = 1;
if (vn) {
if (!qpt_valid
|| !prefix_match(vn, &qpt)) {
#ifdef DEBUG_L2_EXTRA
vnc_zlog_debug_verbose(
"%s: continue at vn && !qpt_valid || !prefix_match(vn, &qpt)",
__func__);
#endif
continue;
}
}
if (!rfapiGetUnAddrOfVpnBi(bpi, &qct))
qct_valid = 1;
if (un) {
if (!qct_valid
|| !prefix_match(un, &qct)) {
#ifdef DEBUG_L2_EXTRA
vnc_zlog_debug_verbose(
"%s: continue at un && !qct_valid || !prefix_match(un, &qct)",
__func__);
#endif
continue;
}
}
/*
* Blow bpi away
*/
/*
* If this route is waiting to be deleted
* because of
* a previous withdraw, we must cancel its
* timer.
*/
if (CHECK_FLAG(bpi->flags, BGP_PATH_REMOVED)) {
if (!delete_holddown)
continue;
if (bpi->extra->vnc.import.timer) {
struct thread *t =
(struct thread *)bpi
->extra->vnc
.import.timer;
struct rfapi_withdraw *wcb =
t->arg;
wcb->import_table
->holddown_count[afi] -=
1;
RFAPI_UPDATE_ITABLE_COUNT(
bpi, wcb->import_table,
afi, 1);
XFREE(MTYPE_RFAPI_WITHDRAW,
wcb);
thread_cancel(t);
}
} else {
if (!delete_active)
continue;
is_active = 1;
}
vnc_zlog_debug_verbose(
"%s: deleting bpi %p (qct_valid=%d, qpt_valid=%d, delete_holddown=%d, delete_active=%d)",
__func__, bpi, qct_valid, qpt_valid,
delete_holddown, delete_active);
/*
* add nve to list
*/
if (qct_valid && qpt_valid) {
struct rfapi_nve_addr na;
struct rfapi_nve_addr *nap;
memset(&na, 0, sizeof(na));
assert(!rfapiQprefix2Raddr(&qct,
&na.un));
assert(!rfapiQprefix2Raddr(&qpt,
&na.vn));
if (skiplist_search(
(is_active
? uniq_active_nves
: uniq_holddown_nves),
&na, (void **)&nap)) {
char line[BUFSIZ];
nap = XCALLOC(
MTYPE_RFAPI_NVE_ADDR,
sizeof(struct
rfapi_nve_addr));
assert(nap);
*nap = na;
nap->info = is_active
? pAHcount
: pHHcount;
skiplist_insert(
(is_active
? uniq_active_nves
: uniq_holddown_nves),
nap, nap);
rfapiNveAddr2Str(nap, line,
BUFSIZ);
}
}
vnc_direct_bgp_rh_del_route(bgp, afi, &rn->p,
bpi->peer);
RFAPI_UPDATE_ITABLE_COUNT(bpi, it, afi, -1);
it->holddown_count[afi] += 1;
rfapiExpireVpnNow(it, rn, bpi, 1);
vnc_zlog_debug_verbose(
"%s: incrementing count (is_active=%d)",
__func__, is_active);
if (is_active)
++*pARcount;
else
++*pHRcount;
}
}
}
}
/*
* For use by the "clear vnc prefixes" command
*/
/*------------------------------------------
* rfapiDeleteRemotePrefixes
*
* UI helper: For use by the "clear vnc prefixes" command
*
* input:
* un if set, tunnel must match this prefix
* vn if set, nexthop prefix must match this prefix
* p if set, prefix must match this prefix
* it if set, only look in this import table
*
* output
* pARcount number of active routes deleted
* pAHcount number of active nves deleted
* pHRcount number of holddown routes deleted
* pHHcount number of holddown nves deleted
*
* return value:
* void
--------------------------------------------*/
void rfapiDeleteRemotePrefixes(struct prefix *un, struct prefix *vn,
struct prefix *p,
struct rfapi_import_table *arg_it,
int delete_active, int delete_holddown,
uint32_t *pARcount, uint32_t *pAHcount,
uint32_t *pHRcount, uint32_t *pHHcount)
{
struct bgp *bgp;
struct rfapi *h;
struct rfapi_import_table *it;
uint32_t deleted_holddown_route_count = 0;
uint32_t deleted_active_route_count = 0;
uint32_t deleted_holddown_nve_count = 0;
uint32_t deleted_active_nve_count = 0;
struct skiplist *uniq_holddown_nves;
struct skiplist *uniq_active_nves;
VNC_ITRCCK;
bgp = bgp_get_default(); /* assume 1 instance for now */
/* If no bgp instantiated yet, no vnc prefixes exist */
if (!bgp)
return;
h = bgp->rfapi;
assert(h);
uniq_holddown_nves =
skiplist_new(0, rfapi_nve_addr_cmp, delete_rem_pfx_na_free);
uniq_active_nves =
skiplist_new(0, rfapi_nve_addr_cmp, delete_rem_pfx_na_free);
/*
* Iterate over all import tables; do a filtered import
* for the afi/safi combination
*/
if (arg_it)
it = arg_it;
else
it = h->imports;
for (; it;) {
vnc_zlog_debug_verbose(
"%s: calling rfapiDeleteRemotePrefixesIt() on (IP) import %p",
__func__, it);
rfapiDeleteRemotePrefixesIt(
bgp, it, un, vn, p, delete_active, delete_holddown,
&deleted_active_route_count, &deleted_active_nve_count,
&deleted_holddown_route_count,
&deleted_holddown_nve_count, uniq_active_nves,
uniq_holddown_nves);
if (arg_it)
it = NULL;
else
it = it->next;
}
/*
* Now iterate over L2 import tables
*/
if (h->import_mac && !(p && (p->family != AF_ETHERNET))) {
void *cursor = NULL;
int rc;
for (cursor = NULL,
rc = skiplist_next(h->import_mac, NULL, (void **)&it,
&cursor);
!rc; rc = skiplist_next(h->import_mac, NULL, (void **)&it,
&cursor)) {
vnc_zlog_debug_verbose(
"%s: calling rfapiDeleteRemotePrefixesIt() on import_mac %p",
__func__, it);
rfapiDeleteRemotePrefixesIt(
bgp, it, un, vn, p, delete_active,
delete_holddown, &deleted_active_route_count,
&deleted_active_nve_count,
&deleted_holddown_route_count,
&deleted_holddown_nve_count, uniq_active_nves,
uniq_holddown_nves);
}
}
/*
* our custom element freeing function above counts as it deletes
*/
skiplist_free(uniq_holddown_nves);
skiplist_free(uniq_active_nves);
if (pARcount)
*pARcount = deleted_active_route_count;
if (pAHcount)
*pAHcount = deleted_active_nve_count;
if (pHRcount)
*pHRcount = deleted_holddown_route_count;
if (pHHcount)
*pHHcount = deleted_holddown_nve_count;
VNC_ITRCCK;
}
/*------------------------------------------
* rfapiCountRemoteRoutes
*
* UI helper: count VRF routes from BGP side
*
* input:
*
* output
* pALRcount count of active local routes
* pARRcount count of active remote routes
* pHRcount count of holddown routes
* pIRcount count of direct imported routes
*
* return value:
* void
--------------------------------------------*/
void rfapiCountAllItRoutes(int *pALRcount, /* active local routes */
int *pARRcount, /* active remote routes */
int *pHRcount, /* holddown routes */
int *pIRcount) /* imported routes */
{
struct bgp *bgp;
struct rfapi *h;
struct rfapi_import_table *it;
afi_t afi;
int total_active_local = 0;
int total_active_remote = 0;
int total_holddown = 0;
int total_imported = 0;
bgp = bgp_get_default(); /* assume 1 instance for now */
assert(bgp);
h = bgp->rfapi;
assert(h);
/*
* Iterate over all import tables; do a filtered import
* for the afi/safi combination
*/
for (it = h->imports; it; it = it->next) {
for (afi = AFI_IP; afi < AFI_MAX; ++afi) {
total_active_local += it->local_count[afi];
total_active_remote += it->remote_count[afi];
total_holddown += it->holddown_count[afi];
total_imported += it->imported_count[afi];
}
}
void *cursor;
int rc;
if (h->import_mac) {
for (cursor = NULL,
rc = skiplist_next(h->import_mac, NULL, (void **)&it,
&cursor);
!rc; rc = skiplist_next(h->import_mac, NULL, (void **)&it,
&cursor)) {
total_active_local += it->local_count[AFI_L2VPN];
total_active_remote += it->remote_count[AFI_L2VPN];
total_holddown += it->holddown_count[AFI_L2VPN];
total_imported += it->imported_count[AFI_L2VPN];
}
}
if (pALRcount) {
*pALRcount = total_active_local;
}
if (pARRcount) {
*pARRcount = total_active_remote;
}
if (pHRcount) {
*pHRcount = total_holddown;
}
if (pIRcount) {
*pIRcount = total_imported;
}
}
/*------------------------------------------
* rfapiGetHolddownFromLifetime
*
* calculate holddown value based on lifetime
*
* input:
* lifetime lifetime
*
* return value:
* Holddown value based on lifetime, holddown_factor,
* and RFAPI_LIFETIME_INFINITE_WITHDRAW_DELAY
*
--------------------------------------------*/
/* hold down time maxes out at RFAPI_LIFETIME_INFINITE_WITHDRAW_DELAY */
uint32_t rfapiGetHolddownFromLifetime(uint32_t lifetime)
{
uint32_t factor;
struct bgp *bgp;
bgp = bgp_get_default();
if (bgp && bgp->rfapi_cfg)
factor = bgp->rfapi_cfg->rfp_cfg.holddown_factor;
else
factor = RFAPI_RFP_CFG_DEFAULT_HOLDDOWN_FACTOR;
if (factor < 100 || lifetime < RFAPI_LIFETIME_INFINITE_WITHDRAW_DELAY)
lifetime = lifetime * factor / 100;
if (lifetime < RFAPI_LIFETIME_INFINITE_WITHDRAW_DELAY)
return lifetime;
else
return RFAPI_LIFETIME_INFINITE_WITHDRAW_DELAY;
}
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