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zebra_mpls.c
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// SPDX-License-Identifier: GPL-2.0-or-later
/* Zebra MPLS code
* Copyright (C) 2013 Cumulus Networks, Inc.
*/
#include <zebra.h>
#include "prefix.h"
#include "table.h"
#include "memory.h"
#include "command.h"
#include "if.h"
#include "log.h"
#include "sockunion.h"
#include "linklist.h"
#include "frrevent.h"
#include "workqueue.h"
#include "prefix.h"
#include "routemap.h"
#include "stream.h"
#include "nexthop.h"
#include "termtable.h"
#include "lib/json.h"
#include "zebra/rib.h"
#include "zebra/rt.h"
#include "zebra/interface.h"
#include "zebra/zserv.h"
#include "zebra/zebra_router.h"
#include "zebra/redistribute.h"
#include "zebra/debug.h"
#include "zebra/zebra_vrf.h"
#include "zebra/zebra_mpls.h"
#include "zebra/zebra_srte.h"
#include "zebra/zebra_errors.h"
DEFINE_MTYPE_STATIC(ZEBRA, LSP, "MPLS LSP object");
DEFINE_MTYPE_STATIC(ZEBRA, FEC, "MPLS FEC object");
DEFINE_MTYPE_STATIC(ZEBRA, NHLFE, "MPLS nexthop object");
bool mpls_enabled;
bool mpls_pw_reach_strict; /* Strict reachability checking */
/* static function declarations */
static void fec_evaluate(struct zebra_vrf *zvrf);
static uint32_t fec_derive_label_from_index(struct zebra_vrf *vrf,
struct zebra_fec *fec);
static int lsp_install(struct zebra_vrf *zvrf, mpls_label_t label,
struct route_node *rn, struct route_entry *re);
static int lsp_uninstall(struct zebra_vrf *zvrf, mpls_label_t label);
static int fec_change_update_lsp(struct zebra_vrf *zvrf, struct zebra_fec *fec,
mpls_label_t old_label);
static int fec_send(struct zebra_fec *fec, struct zserv *client);
static void fec_update_clients(struct zebra_fec *fec);
static void fec_print(struct zebra_fec *fec, struct vty *vty);
static struct zebra_fec *fec_find(struct route_table *table, struct prefix *p);
static struct zebra_fec *fec_add(struct route_table *table, struct prefix *p,
mpls_label_t label, uint32_t flags,
uint32_t label_index);
static int fec_del(struct zebra_fec *fec);
static unsigned int label_hash(const void *p);
static bool label_cmp(const void *p1, const void *p2);
static int nhlfe_nexthop_active_ipv4(struct zebra_nhlfe *nhlfe,
struct nexthop *nexthop);
static int nhlfe_nexthop_active_ipv6(struct zebra_nhlfe *nhlfe,
struct nexthop *nexthop);
static int nhlfe_nexthop_active(struct zebra_nhlfe *nhlfe);
static void lsp_select_best_nhlfe(struct zebra_lsp *lsp);
static void lsp_uninstall_from_kernel(struct hash_bucket *bucket, void *ctxt);
static void lsp_schedule(struct hash_bucket *bucket, void *ctxt);
static wq_item_status lsp_process(struct work_queue *wq, void *data);
static void lsp_processq_del(struct work_queue *wq, void *data);
static void lsp_processq_complete(struct work_queue *wq);
static int lsp_processq_add(struct zebra_lsp *lsp);
static void *lsp_alloc(void *p);
/* Check whether lsp can be freed - no nhlfes, e.g., and call free api */
static void lsp_check_free(struct hash *lsp_table, struct zebra_lsp **plsp);
/* Free lsp; sets caller's pointer to NULL */
static void lsp_free(struct hash *lsp_table, struct zebra_lsp **plsp);
static char *nhlfe2str(const struct zebra_nhlfe *nhlfe, char *buf, int size);
static char *nhlfe_config_str(const struct zebra_nhlfe *nhlfe, char *buf,
int size);
static int nhlfe_nhop_match(struct zebra_nhlfe *nhlfe,
enum nexthop_types_t gtype,
const union g_addr *gate, ifindex_t ifindex);
static struct zebra_nhlfe *nhlfe_find(struct nhlfe_list_head *list,
enum lsp_types_t lsp_type,
enum nexthop_types_t gtype,
const union g_addr *gate,
ifindex_t ifindex);
static struct zebra_nhlfe *
nhlfe_add(struct zebra_lsp *lsp, enum lsp_types_t lsp_type,
enum nexthop_types_t gtype, const union g_addr *gate,
ifindex_t ifindex, vrf_id_t vrf_id, uint8_t num_labels,
const mpls_label_t *labels, bool is_backup);
static int nhlfe_del(struct zebra_nhlfe *nhlfe);
static void nhlfe_free(struct zebra_nhlfe *nhlfe);
static void nhlfe_out_label_update(struct zebra_nhlfe *nhlfe,
struct mpls_label_stack *nh_label);
static int mpls_lsp_uninstall_all(struct hash *lsp_table, struct zebra_lsp *lsp,
enum lsp_types_t type);
static int mpls_static_lsp_uninstall_all(struct zebra_vrf *zvrf,
mpls_label_t in_label);
static void nhlfe_print(struct zebra_nhlfe *nhlfe, struct vty *vty,
const char *indent);
static void lsp_print(struct vty *vty, struct zebra_lsp *lsp);
static void mpls_lsp_uninstall_all_type(struct hash_bucket *bucket, void *ctxt);
static void mpls_ftn_uninstall_all(struct zebra_vrf *zvrf,
int afi, enum lsp_types_t lsp_type);
static int lsp_znh_install(struct zebra_lsp *lsp, enum lsp_types_t type,
const struct zapi_nexthop *znh);
static int lsp_backup_znh_install(struct zebra_lsp *lsp, enum lsp_types_t type,
const struct zapi_nexthop *znh);
/* Static functions */
/*
* Handle failure in LSP install, clear flags for NHLFE.
*/
static void clear_nhlfe_installed(struct zebra_lsp *lsp)
{
struct zebra_nhlfe *nhlfe;
struct nexthop *nexthop;
frr_each_safe(nhlfe_list, &lsp->nhlfe_list, nhlfe) {
nexthop = nhlfe->nexthop;
if (!nexthop)
continue;
UNSET_FLAG(nhlfe->flags, NHLFE_FLAG_INSTALLED);
UNSET_FLAG(nexthop->flags, NEXTHOP_FLAG_FIB);
}
frr_each_safe(nhlfe_list, &lsp->backup_nhlfe_list, nhlfe) {
nexthop = nhlfe->nexthop;
if (!nexthop)
continue;
UNSET_FLAG(nhlfe->flags, NHLFE_FLAG_INSTALLED);
UNSET_FLAG(nexthop->flags, NEXTHOP_FLAG_FIB);
}
}
/*
* Install label forwarding entry based on labeled-route entry.
*/
static int lsp_install(struct zebra_vrf *zvrf, mpls_label_t label,
struct route_node *rn, struct route_entry *re)
{
struct hash *lsp_table;
struct zebra_ile tmp_ile;
struct zebra_lsp *lsp;
struct zebra_nhlfe *nhlfe;
struct nexthop *nexthop;
enum lsp_types_t lsp_type;
char buf[BUFSIZ];
int added, changed;
/* Lookup table. */
lsp_table = zvrf->lsp_table;
if (!lsp_table)
return -1;
lsp_type = lsp_type_from_re_type(re->type);
added = changed = 0;
/* Locate or allocate LSP entry. */
tmp_ile.in_label = label;
lsp = hash_get(lsp_table, &tmp_ile, lsp_alloc);
/* For each active nexthop, create NHLFE. Note that we deliberately skip
* recursive nexthops right now, because intermediate hops won't
* understand
* the label advertised by the recursive nexthop (plus we don't have the
* logic yet to push multiple labels).
*/
for (nexthop = re->nhe->nhg.nexthop;
nexthop; nexthop = nexthop->next) {
/* Skip inactive and recursive entries. */
if (!CHECK_FLAG(nexthop->flags, NEXTHOP_FLAG_ACTIVE))
continue;
if (CHECK_FLAG(nexthop->flags, NEXTHOP_FLAG_RECURSIVE))
continue;
nhlfe = nhlfe_find(&lsp->nhlfe_list, lsp_type,
nexthop->type, &nexthop->gate,
nexthop->ifindex);
if (nhlfe) {
/* Clear deleted flag (in case it was set) */
UNSET_FLAG(nhlfe->flags, NHLFE_FLAG_DELETED);
if (nexthop_labels_match(nhlfe->nexthop, nexthop))
/* No change */
continue;
if (IS_ZEBRA_DEBUG_MPLS) {
nhlfe2str(nhlfe, buf, BUFSIZ);
zlog_debug(
"LSP in-label %u type %d nexthop %s out-label changed",
lsp->ile.in_label, lsp_type, buf);
}
/* Update out label, trigger processing. */
nhlfe_out_label_update(nhlfe, nexthop->nh_label);
SET_FLAG(nhlfe->flags, NHLFE_FLAG_CHANGED);
changed++;
} else {
/* Add LSP entry to this nexthop */
nhlfe = nhlfe_add(
lsp, lsp_type, nexthop->type, &nexthop->gate,
nexthop->ifindex, nexthop->vrf_id,
nexthop->nh_label->num_labels,
nexthop->nh_label->label, false /*backup*/);
if (!nhlfe)
return -1;
if (IS_ZEBRA_DEBUG_MPLS) {
nhlfe2str(nhlfe, buf, BUFSIZ);
zlog_debug(
"Add LSP in-label %u type %d nexthop %s out-label %u",
lsp->ile.in_label, lsp_type, buf,
nexthop->nh_label->label[0]);
}
lsp->addr_family = NHLFE_FAMILY(nhlfe);
/* Mark NHLFE as changed. */
SET_FLAG(nhlfe->flags, NHLFE_FLAG_CHANGED);
added++;
}
}
/* Queue LSP for processing if necessary. If no NHLFE got added (special
* case), delete the LSP entry; this case results in somewhat ugly
* logging.
*/
if (added || changed) {
if (lsp_processq_add(lsp))
return -1;
} else {
lsp_check_free(lsp_table, &lsp);
}
return 0;
}
/*
* Uninstall all non-static NHLFEs of a label forwarding entry. If all
* NHLFEs are removed, the entire entry is deleted.
*/
static int lsp_uninstall(struct zebra_vrf *zvrf, mpls_label_t label)
{
struct hash *lsp_table;
struct zebra_ile tmp_ile;
struct zebra_lsp *lsp;
struct zebra_nhlfe *nhlfe;
char buf[BUFSIZ];
/* Lookup table. */
lsp_table = zvrf->lsp_table;
if (!lsp_table)
return -1;
/* If entry is not present, exit. */
tmp_ile.in_label = label;
lsp = hash_lookup(lsp_table, &tmp_ile);
if (!lsp || (nhlfe_list_first(&lsp->nhlfe_list) == NULL))
return 0;
/* Mark NHLFEs for delete or directly delete, as appropriate. */
frr_each_safe(nhlfe_list, &lsp->nhlfe_list, nhlfe) {
/* Skip static NHLFEs */
if (nhlfe->type == ZEBRA_LSP_STATIC)
continue;
if (IS_ZEBRA_DEBUG_MPLS) {
nhlfe2str(nhlfe, buf, BUFSIZ);
zlog_debug(
"Del LSP in-label %u type %d nexthop %s flags 0x%x",
label, nhlfe->type, buf, nhlfe->flags);
}
if (CHECK_FLAG(nhlfe->flags, NHLFE_FLAG_SELECTED)) {
UNSET_FLAG(nhlfe->flags, NHLFE_FLAG_CHANGED);
SET_FLAG(nhlfe->flags, NHLFE_FLAG_DELETED);
} else {
nhlfe_del(nhlfe);
}
}
/* Queue LSP for processing, if needed, else delete. */
if (CHECK_FLAG(lsp->flags, LSP_FLAG_INSTALLED)) {
if (lsp_processq_add(lsp))
return -1;
} else {
lsp_check_free(lsp_table, &lsp);
}
return 0;
}
/*
* This function is invoked upon change to label block configuration; it
* will walk all registered FECs with label-index and appropriately update
* their local labels and trigger client updates.
*/
static void fec_evaluate(struct zebra_vrf *zvrf)
{
struct route_node *rn;
struct zebra_fec *fec;
uint32_t old_label, new_label;
int af;
for (af = AFI_IP; af < AFI_MAX; af++) {
if (zvrf->fec_table[af] == NULL)
continue;
for (rn = route_top(zvrf->fec_table[af]); rn;
rn = route_next(rn)) {
if ((fec = rn->info) == NULL)
continue;
/* Skip configured FECs and those without a label index.
*/
if (fec->flags & FEC_FLAG_CONFIGURED
|| fec->label_index == MPLS_INVALID_LABEL_INDEX)
continue;
/* Save old label, determine new label. */
old_label = fec->label;
new_label =
zvrf->mpls_srgb.start_label + fec->label_index;
if (new_label >= zvrf->mpls_srgb.end_label)
new_label = MPLS_INVALID_LABEL;
/* If label has changed, update FEC and clients. */
if (new_label == old_label)
continue;
if (IS_ZEBRA_DEBUG_MPLS)
zlog_debug(
"Update fec %pRN new label %u upon label block",
rn, new_label);
fec->label = new_label;
fec_update_clients(fec);
/* Update label forwarding entries appropriately */
fec_change_update_lsp(zvrf, fec, old_label);
}
}
}
/*
* Derive (if possible) and update the local label for the FEC based on
* its label index. The index is "acceptable" if it falls within the
* globally configured label block (SRGB).
*/
static uint32_t fec_derive_label_from_index(struct zebra_vrf *zvrf,
struct zebra_fec *fec)
{
uint32_t label;
if (fec->label_index != MPLS_INVALID_LABEL_INDEX
&& zvrf->mpls_srgb.start_label
&& ((label = zvrf->mpls_srgb.start_label + fec->label_index)
< zvrf->mpls_srgb.end_label))
fec->label = label;
else
fec->label = MPLS_INVALID_LABEL;
return fec->label;
}
/*
* There is a change for this FEC. Install or uninstall label forwarding
* entries, as appropriate.
*/
static int fec_change_update_lsp(struct zebra_vrf *zvrf, struct zebra_fec *fec,
mpls_label_t old_label)
{
struct route_table *table;
struct route_node *rn;
struct route_entry *re;
afi_t afi;
/* Uninstall label forwarding entry, if previously installed. */
if (old_label != MPLS_INVALID_LABEL
&& old_label != MPLS_LABEL_IMPLICIT_NULL)
lsp_uninstall(zvrf, old_label);
/* Install label forwarding entry corr. to new label, if needed. */
if (fec->label == MPLS_INVALID_LABEL
|| fec->label == MPLS_LABEL_IMPLICIT_NULL)
return 0;
afi = family2afi(PREFIX_FAMILY(&fec->rn->p));
table = zebra_vrf_table(afi, SAFI_UNICAST, zvrf_id(zvrf));
if (!table)
return 0;
/* See if labeled route exists. */
rn = route_node_lookup(table, &fec->rn->p);
if (!rn)
return 0;
RNODE_FOREACH_RE (rn, re) {
if (CHECK_FLAG(re->flags, ZEBRA_FLAG_SELECTED))
break;
}
if (!re || !zebra_rib_labeled_unicast(re))
return 0;
if (lsp_install(zvrf, fec->label, rn, re))
return -1;
return 0;
}
/*
* Inform about FEC to a registered client.
*/
static int fec_send(struct zebra_fec *fec, struct zserv *client)
{
struct stream *s;
struct route_node *rn;
rn = fec->rn;
/* Get output stream. */
s = stream_new(ZEBRA_MAX_PACKET_SIZ);
zclient_create_header(s, ZEBRA_FEC_UPDATE, VRF_DEFAULT);
stream_putw(s, rn->p.family);
stream_put_prefix(s, &rn->p);
stream_putl(s, fec->label);
stream_putw_at(s, 0, stream_get_endp(s));
return zserv_send_message(client, s);
}
/*
* Update all registered clients about this FEC. Caller should've updated
* FEC and ensure no duplicate updates.
*/
static void fec_update_clients(struct zebra_fec *fec)
{
struct listnode *node;
struct zserv *client;
for (ALL_LIST_ELEMENTS_RO(fec->client_list, node, client)) {
if (IS_ZEBRA_DEBUG_MPLS)
zlog_debug("Update client %s",
zebra_route_string(client->proto));
fec_send(fec, client);
}
}
/*
* Print a FEC-label binding entry.
*/
static void fec_print(struct zebra_fec *fec, struct vty *vty)
{
struct route_node *rn;
struct listnode *node;
struct zserv *client;
char buf[BUFSIZ];
rn = fec->rn;
vty_out(vty, "%pRN\n", rn);
vty_out(vty, " Label: %s", label2str(fec->label, 0, buf, BUFSIZ));
if (fec->label_index != MPLS_INVALID_LABEL_INDEX)
vty_out(vty, ", Label Index: %u", fec->label_index);
vty_out(vty, "\n");
if (!list_isempty(fec->client_list)) {
vty_out(vty, " Client list:");
for (ALL_LIST_ELEMENTS_RO(fec->client_list, node, client))
vty_out(vty, " %s(fd %d)",
zebra_route_string(client->proto),
client->sock);
vty_out(vty, "\n");
}
}
/*
* Locate FEC-label binding that matches with passed info.
*/
static struct zebra_fec *fec_find(struct route_table *table, struct prefix *p)
{
struct route_node *rn;
apply_mask(p);
rn = route_node_lookup(table, p);
if (!rn)
return NULL;
route_unlock_node(rn);
return (rn->info);
}
/*
* Add a FEC. This may be upon a client registering for a binding
* or when a binding is configured.
*/
static struct zebra_fec *fec_add(struct route_table *table, struct prefix *p,
mpls_label_t label, uint32_t flags,
uint32_t label_index)
{
struct route_node *rn;
struct zebra_fec *fec;
apply_mask(p);
/* Lookup (or add) route node.*/
rn = route_node_get(table, p);
if (!rn)
return NULL;
fec = rn->info;
if (!fec) {
fec = XCALLOC(MTYPE_FEC, sizeof(struct zebra_fec));
rn->info = fec;
fec->rn = rn;
fec->label = label;
fec->client_list = list_new();
} else
route_unlock_node(rn); /* for the route_node_get */
fec->label_index = label_index;
fec->flags = flags;
return fec;
}
/*
* Delete a FEC. This may be upon the last client deregistering for
* a FEC and no binding exists or when the binding is deleted and there
* are no registered clients.
*/
static int fec_del(struct zebra_fec *fec)
{
list_delete(&fec->client_list);
fec->rn->info = NULL;
route_unlock_node(fec->rn);
XFREE(MTYPE_FEC, fec);
return 0;
}
/*
* Hash function for label.
*/
static unsigned int label_hash(const void *p)
{
const struct zebra_ile *ile = p;
return (jhash_1word(ile->in_label, 0));
}
/*
* Compare 2 LSP hash entries based on in-label.
*/
static bool label_cmp(const void *p1, const void *p2)
{
const struct zebra_ile *ile1 = p1;
const struct zebra_ile *ile2 = p2;
return (ile1->in_label == ile2->in_label);
}
/*
* Check if an IPv4 nexthop for a NHLFE is active. Update nexthop based on
* the passed flag.
* NOTE: Looking only for connected routes right now.
*/
static int nhlfe_nexthop_active_ipv4(struct zebra_nhlfe *nhlfe,
struct nexthop *nexthop)
{
struct route_table *table;
struct prefix_ipv4 p;
struct route_node *rn;
struct route_entry *match;
struct nexthop *match_nh;
table = zebra_vrf_table(AFI_IP, SAFI_UNICAST, nexthop->vrf_id);
if (!table)
return 0;
/* Lookup nexthop in IPv4 routing table. */
memset(&p, 0, sizeof(p));
p.family = AF_INET;
p.prefixlen = IPV4_MAX_BITLEN;
p.prefix = nexthop->gate.ipv4;
rn = route_node_match(table, (struct prefix *)&p);
if (!rn)
return 0;
route_unlock_node(rn);
/* Locate a valid connected route. */
RNODE_FOREACH_RE (rn, match) {
if (CHECK_FLAG(match->status, ROUTE_ENTRY_REMOVED)
|| !CHECK_FLAG(match->flags, ZEBRA_FLAG_SELECTED))
continue;
for (match_nh = match->nhe->nhg.nexthop; match_nh;
match_nh = match_nh->next) {
if (match->type == ZEBRA_ROUTE_CONNECT
|| nexthop->ifindex == match_nh->ifindex) {
nexthop->ifindex = match_nh->ifindex;
return 1;
}
}
}
return 0;
}
/*
* Check if an IPv6 nexthop for a NHLFE is active. Update nexthop based on
* the passed flag.
* NOTE: Looking only for connected routes right now.
*/
static int nhlfe_nexthop_active_ipv6(struct zebra_nhlfe *nhlfe,
struct nexthop *nexthop)
{
struct route_table *table;
struct prefix_ipv6 p;
struct route_node *rn;
struct route_entry *match;
table = zebra_vrf_table(AFI_IP6, SAFI_UNICAST, nexthop->vrf_id);
if (!table)
return 0;
/* Lookup nexthop in IPv6 routing table. */
memset(&p, 0, sizeof(p));
p.family = AF_INET6;
p.prefixlen = IPV6_MAX_BITLEN;
p.prefix = nexthop->gate.ipv6;
rn = route_node_match(table, (struct prefix *)&p);
if (!rn)
return 0;
route_unlock_node(rn);
/* Locate a valid connected route. */
RNODE_FOREACH_RE (rn, match) {
if ((match->type == ZEBRA_ROUTE_CONNECT)
&& !CHECK_FLAG(match->status, ROUTE_ENTRY_REMOVED)
&& CHECK_FLAG(match->flags, ZEBRA_FLAG_SELECTED))
break;
}
if (!match || !match->nhe->nhg.nexthop)
return 0;
nexthop->ifindex = match->nhe->nhg.nexthop->ifindex;
return 1;
}
/*
* Check the nexthop reachability for a NHLFE and return if valid (reachable)
* or not.
* NOTE: Each NHLFE points to only 1 nexthop.
*/
static int nhlfe_nexthop_active(struct zebra_nhlfe *nhlfe)
{
struct nexthop *nexthop;
struct interface *ifp;
struct zebra_ns *zns;
nexthop = nhlfe->nexthop;
if (!nexthop) // unexpected
return 0;
/* Check on nexthop based on type. */
switch (nexthop->type) {
case NEXTHOP_TYPE_IFINDEX:
/*
* Lookup if this type is special. The
* NEXTHOP_TYPE_IFINDEX is a pop and
* forward into a different table for
* processing. As such this ifindex
* passed to us may be a VRF device
* which will not be in the default
* VRF. So let's look in all of them
*/
zns = zebra_ns_lookup(NS_DEFAULT);
ifp = if_lookup_by_index_per_ns(zns, nexthop->ifindex);
if (ifp && if_is_operative(ifp))
SET_FLAG(nexthop->flags, NEXTHOP_FLAG_ACTIVE);
else
UNSET_FLAG(nexthop->flags, NEXTHOP_FLAG_ACTIVE);
break;
case NEXTHOP_TYPE_IPV4:
case NEXTHOP_TYPE_IPV4_IFINDEX:
if (nhlfe_nexthop_active_ipv4(nhlfe, nexthop))
SET_FLAG(nexthop->flags, NEXTHOP_FLAG_ACTIVE);
else
UNSET_FLAG(nexthop->flags, NEXTHOP_FLAG_ACTIVE);
break;
case NEXTHOP_TYPE_IPV6:
if (nhlfe_nexthop_active_ipv6(nhlfe, nexthop))
SET_FLAG(nexthop->flags, NEXTHOP_FLAG_ACTIVE);
else
UNSET_FLAG(nexthop->flags, NEXTHOP_FLAG_ACTIVE);
break;
case NEXTHOP_TYPE_IPV6_IFINDEX:
if (IN6_IS_ADDR_LINKLOCAL(&nexthop->gate.ipv6)) {
ifp = if_lookup_by_index(nexthop->ifindex,
nexthop->vrf_id);
if (ifp && if_is_operative(ifp))
SET_FLAG(nexthop->flags, NEXTHOP_FLAG_ACTIVE);
else
UNSET_FLAG(nexthop->flags, NEXTHOP_FLAG_ACTIVE);
} else {
if (nhlfe_nexthop_active_ipv6(nhlfe, nexthop))
SET_FLAG(nexthop->flags, NEXTHOP_FLAG_ACTIVE);
else
UNSET_FLAG(nexthop->flags, NEXTHOP_FLAG_ACTIVE);
}
break;
case NEXTHOP_TYPE_BLACKHOLE:
break;
}
return CHECK_FLAG(nexthop->flags, NEXTHOP_FLAG_ACTIVE);
}
/*
* Walk through NHLFEs for a LSP forwarding entry, verify nexthop
* reachability and select the best. Multipath entries are also
* marked. This is invoked when an LSP scheduled for processing (due
* to some change) is examined.
*/
static void lsp_select_best_nhlfe(struct zebra_lsp *lsp)
{
struct zebra_nhlfe *nhlfe;
struct zebra_nhlfe *best;
struct nexthop *nexthop;
int changed = 0;
if (!lsp)
return;
best = NULL;
lsp->num_ecmp = 0;
UNSET_FLAG(lsp->flags, LSP_FLAG_CHANGED);
/*
* First compute the best path, after checking nexthop status. We are
* only concerned with non-deleted NHLFEs.
*/
frr_each_safe(nhlfe_list, &lsp->nhlfe_list, nhlfe) {
/* Clear selection flags. */
UNSET_FLAG(nhlfe->flags,
(NHLFE_FLAG_SELECTED | NHLFE_FLAG_MULTIPATH));
if (!CHECK_FLAG(nhlfe->flags, NHLFE_FLAG_DELETED)
&& nhlfe_nexthop_active(nhlfe)) {
if (!best || (nhlfe->distance < best->distance))
best = nhlfe;
}
}
lsp->best_nhlfe = best;
if (!lsp->best_nhlfe)
return;
/*
* Check the active status of backup nhlfes also
*/
frr_each_safe(nhlfe_list, &lsp->backup_nhlfe_list, nhlfe) {
if (!CHECK_FLAG(nhlfe->flags, NHLFE_FLAG_DELETED))
(void)nhlfe_nexthop_active(nhlfe);
}
/* Mark best NHLFE as selected. */
SET_FLAG(lsp->best_nhlfe->flags, NHLFE_FLAG_SELECTED);
/*
* If best path exists, see if there is ECMP. While doing this, note if
* a
* new (uninstalled) NHLFE has been selected, an installed entry that is
* still selected has a change or an installed entry is to be removed.
*/
frr_each(nhlfe_list, &lsp->nhlfe_list, nhlfe) {
int nh_chg, nh_sel, nh_inst;
nexthop = nhlfe->nexthop;
if (!nexthop) // unexpected
continue;
if (!CHECK_FLAG(nhlfe->flags, NHLFE_FLAG_DELETED)
&& CHECK_FLAG(nexthop->flags, NEXTHOP_FLAG_ACTIVE)
&& (nhlfe->distance == lsp->best_nhlfe->distance)) {
SET_FLAG(nhlfe->flags, NHLFE_FLAG_SELECTED);
SET_FLAG(nhlfe->flags, NHLFE_FLAG_MULTIPATH);
lsp->num_ecmp++;
}
if (CHECK_FLAG(lsp->flags, LSP_FLAG_INSTALLED) && !changed) {
nh_chg = CHECK_FLAG(nhlfe->flags, NHLFE_FLAG_CHANGED);
nh_sel = CHECK_FLAG(nhlfe->flags, NHLFE_FLAG_SELECTED);
nh_inst =
CHECK_FLAG(nhlfe->flags, NHLFE_FLAG_INSTALLED);
if ((nh_sel && !nh_inst)
|| (nh_sel && nh_inst && nh_chg)
|| (nh_inst && !nh_sel))
changed = 1;
}
/* We have finished examining, clear changed flag. */
UNSET_FLAG(nhlfe->flags, NHLFE_FLAG_CHANGED);
}
if (changed)
SET_FLAG(lsp->flags, LSP_FLAG_CHANGED);
}
/*
* Delete LSP forwarding entry from kernel, if installed. Called upon
* process exit.
*/
static void lsp_uninstall_from_kernel(struct hash_bucket *bucket, void *ctxt)
{
struct zebra_lsp *lsp;
lsp = (struct zebra_lsp *)bucket->data;
if (CHECK_FLAG(lsp->flags, LSP_FLAG_INSTALLED))
(void)dplane_lsp_delete(lsp);
}
/*
* Schedule LSP forwarding entry for processing. Called upon changes
* that may impact LSPs such as nexthop / connected route changes.
*/
static void lsp_schedule(struct hash_bucket *bucket, void *ctxt)
{
struct zebra_lsp *lsp;
lsp = (struct zebra_lsp *)bucket->data;
/* In the common flow, this is used when external events occur. For
* LSPs with backup nhlfes, we'll assume that the forwarding
* plane will use the backups to handle these events, until the
* owning protocol can react.
*/
if (ctxt == NULL) {
/* Skip LSPs with backups */
if (nhlfe_list_first(&lsp->backup_nhlfe_list) != NULL) {
if (IS_ZEBRA_DEBUG_MPLS_DETAIL)
zlog_debug("%s: skip LSP in-label %u",
__func__, lsp->ile.in_label);
return;
}
}
(void)lsp_processq_add(lsp);
}
/*
* Process a LSP entry that is in the queue. Recalculate best NHLFE and
* any multipaths and update or delete from the kernel, as needed.
*/
static wq_item_status lsp_process(struct work_queue *wq, void *data)
{
struct zebra_lsp *lsp;
struct zebra_nhlfe *oldbest, *newbest;
char buf[BUFSIZ], buf2[BUFSIZ];
struct zebra_vrf *zvrf = zebra_vrf_lookup_by_id(VRF_DEFAULT);
enum zebra_dplane_result res;
lsp = (struct zebra_lsp *)data;
if (!lsp) // unexpected
return WQ_SUCCESS;
oldbest = lsp->best_nhlfe;
/* Select best NHLFE(s) */
lsp_select_best_nhlfe(lsp);
newbest = lsp->best_nhlfe;
if (IS_ZEBRA_DEBUG_MPLS) {
if (oldbest)
nhlfe2str(oldbest, buf, sizeof(buf));
if (newbest)
nhlfe2str(newbest, buf2, sizeof(buf2));
zlog_debug(
"Process LSP in-label %u oldbest %s newbest %s flags 0x%x ecmp# %d",
lsp->ile.in_label, oldbest ? buf : "NULL",
newbest ? buf2 : "NULL", lsp->flags, lsp->num_ecmp);
}
if (!CHECK_FLAG(lsp->flags, LSP_FLAG_INSTALLED)) {
/* Not already installed */
if (newbest) {
UNSET_FLAG(lsp->flags, LSP_FLAG_CHANGED);
switch (dplane_lsp_add(lsp)) {
case ZEBRA_DPLANE_REQUEST_QUEUED:
/* Set 'installed' flag so we will know
* that an install is in-flight.
*/
SET_FLAG(lsp->flags, LSP_FLAG_INSTALLED);
zvrf->lsp_installs_queued++;
break;
case ZEBRA_DPLANE_REQUEST_FAILURE:
flog_warn(EC_ZEBRA_LSP_INSTALL_FAILURE,
"LSP Install Failure: %u",
lsp->ile.in_label);
break;
case ZEBRA_DPLANE_REQUEST_SUCCESS:
zvrf->lsp_installs++;
break;
}
}
} else {
/* Installed, may need an update and/or delete. */
if (!newbest) {
res = dplane_lsp_delete(lsp);
/* We do some of the lsp cleanup immediately for
* deletes.
*/
UNSET_FLAG(lsp->flags, LSP_FLAG_INSTALLED);
clear_nhlfe_installed(lsp);
switch (res) {
case ZEBRA_DPLANE_REQUEST_QUEUED:
zvrf->lsp_removals_queued++;
break;
case ZEBRA_DPLANE_REQUEST_FAILURE:
flog_warn(EC_ZEBRA_LSP_DELETE_FAILURE,
"LSP Deletion Failure: %u",
lsp->ile.in_label);
break;
case ZEBRA_DPLANE_REQUEST_SUCCESS:
zvrf->lsp_removals++;
break;
}
} else if (CHECK_FLAG(lsp->flags, LSP_FLAG_CHANGED)) {
struct zebra_nhlfe *nhlfe;
struct nexthop *nexthop;
UNSET_FLAG(lsp->flags, LSP_FLAG_CHANGED);
/* We leave the INSTALLED flag set here
* so we know an update is in-flight.
*/
/*
* Any NHLFE that was installed but is not
* selected now needs to have its flags updated.
*/
frr_each_safe(nhlfe_list, &lsp->nhlfe_list, nhlfe) {
nexthop = nhlfe->nexthop;
if (!nexthop)
continue;
if (CHECK_FLAG(nhlfe->flags,
NHLFE_FLAG_INSTALLED)
&& !CHECK_FLAG(nhlfe->flags,
NHLFE_FLAG_SELECTED)) {
UNSET_FLAG(nhlfe->flags,
NHLFE_FLAG_INSTALLED);
UNSET_FLAG(nexthop->flags,
NEXTHOP_FLAG_FIB);
}
}
switch (dplane_lsp_update(lsp)) {
case ZEBRA_DPLANE_REQUEST_QUEUED:
zvrf->lsp_installs_queued++;
break;
case ZEBRA_DPLANE_REQUEST_FAILURE:
flog_warn(EC_ZEBRA_LSP_INSTALL_FAILURE,
"LSP Update Failure: %u",