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zebra: static label binding
Implement static label binding of a label to a prefix (FEC). Note: Currently, only binding to a prefix is supported, the nexthop and/or other parameters are not considered. This was cherry-picked by hand from an earlier mpls branch. Signed-off-by: Don Slice <dslice@cumulusnetworks.com>
This commit is contained in:
Don Slice
Donald Sharp
parent
bc7268d524
commit
f31e084c7c
@ -47,6 +47,7 @@
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#include "zebra/zebra_mpls.h"
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DEFINE_MTYPE_STATIC(ZEBRA, LSP, "MPLS LSP object")
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DEFINE_MTYPE_STATIC(ZEBRA, FEC, "MPLS FEC object")
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DEFINE_MTYPE_STATIC(ZEBRA, SLSP, "MPLS static LSP config")
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DEFINE_MTYPE_STATIC(ZEBRA, NHLFE, "MPLS nexthop object")
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DEFINE_MTYPE_STATIC(ZEBRA, SNHLFE, "MPLS static nexthop object")
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@ -58,6 +59,17 @@ int mpls_enabled;
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extern struct zebra_t zebrad;
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/* static function declarations */
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static void
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fec_print (zebra_fec_t *fec, struct vty *vty);
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static zebra_fec_t *
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fec_find (struct route_table *table, struct prefix *p);
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static zebra_fec_t *
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fec_add (struct route_table *table, struct prefix *p, u_int32_t label,
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u_int32_t flags);
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static int
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fec_del (zebra_fec_t *fec);
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static unsigned int
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label_hash (void *p);
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static int
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@ -68,6 +80,7 @@ static int
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nhlfe_nexthop_active_ipv6 (zebra_nhlfe_t *nhlfe, struct nexthop *nexthop);
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static int
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nhlfe_nexthop_active (zebra_nhlfe_t *nhlfe);
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static void
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lsp_select_best_nhlfe (zebra_lsp_t *lsp);
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static void
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@ -84,6 +97,7 @@ static int
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lsp_processq_add (zebra_lsp_t *lsp);
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static void *
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lsp_alloc (void *p);
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static char *
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nhlfe2str (zebra_nhlfe_t *nhlfe, char *buf, int size);
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static int
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@ -134,6 +148,88 @@ mpls_processq_init (struct zebra_t *zebra);
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/* Static functions */
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/*
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* Print a FEC-label binding entry.
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*/
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static void
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fec_print (zebra_fec_t *fec, struct vty *vty)
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{
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struct route_node *rn;
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char buf[BUFSIZ];
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rn = fec->rn;
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prefix2str(&rn->p, buf, BUFSIZ);
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vty_out(vty, "%s%s", buf, VTY_NEWLINE);
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vty_out(vty, " Label: %s", label2str(fec->label, buf, BUFSIZ));
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vty_out(vty, "%s", VTY_NEWLINE);
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}
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/*
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* Locate FEC-label binding that matches with passed info.
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*/
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static zebra_fec_t *
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fec_find (struct route_table *table, struct prefix *p)
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{
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struct route_node *rn;
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apply_mask (p);
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rn = route_node_lookup(table, p);
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if (!rn)
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return NULL;
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route_unlock_node(rn);
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return (rn->info);
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}
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/*
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* Add a FEC.
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*/
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static zebra_fec_t *
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fec_add (struct route_table *table, struct prefix *p,
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mpls_label_t label, u_int32_t flags)
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{
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struct route_node *rn;
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zebra_fec_t *fec;
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apply_mask (p);
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/* Lookup (or add) route node.*/
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rn = route_node_get (table, p);
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if (!rn)
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return NULL;
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fec = rn->info;
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if (!fec)
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{
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fec = XCALLOC (MTYPE_FEC, sizeof(zebra_fec_t));
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if (!fec)
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return NULL;
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rn->info = fec;
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fec->rn = rn;
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fec->label = label;
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}
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else
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route_unlock_node (rn); /* for the route_node_get */
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fec->flags = flags;
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return fec;
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}
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/*
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* Delete a FEC.
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*/
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static int
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fec_del (zebra_fec_t *fec)
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{
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fec->rn->info = NULL;
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route_unlock_node (fec->rn);
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XFREE (MTYPE_FEC, fec);
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return 0;
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}
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/*
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* Hash function for label.
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*/
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@ -1274,6 +1370,215 @@ mpls_label2str (u_int8_t num_labels, mpls_label_t *labels,
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return buf;
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}
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/*
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* Return FEC (if any) to which this label is bound.
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* Note: Only works for per-prefix binding and when the label is not
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* implicit-null.
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* TODO: Currently walks entire table, can optimize later with another
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* hash..
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*/
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zebra_fec_t *
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zebra_mpls_fec_for_label (struct zebra_vrf *zvrf, mpls_label_t label)
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{
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struct route_node *rn;
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zebra_fec_t *fec;
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int af;
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for (af = AFI_IP; af < AFI_MAX; af++)
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{
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if (zvrf->fec_table[af] == NULL)
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continue;
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for (rn = route_top(zvrf->fec_table[af]); rn; rn = route_next(rn))
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{
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if (!rn->info)
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continue;
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fec = rn->info;
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if (fec->label == label)
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return fec;
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}
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}
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return NULL;
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}
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/*
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* Inform if specified label is currently bound to a FEC or not.
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*/
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int
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zebra_mpls_label_already_bound (struct zebra_vrf *zvrf, mpls_label_t label)
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{
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return (zebra_mpls_fec_for_label (zvrf, label) ? 1 : 0);
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}
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/*
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* Add static FEC to label binding.
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*/
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int
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zebra_mpls_static_fec_add (struct zebra_vrf *zvrf, struct prefix *p,
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mpls_label_t in_label)
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{
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struct route_table *table;
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zebra_fec_t *fec;
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char buf[BUFSIZ];
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int ret = 0;
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table = zvrf->fec_table[family2afi(PREFIX_FAMILY(p))];
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if (!table)
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return -1;
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if (IS_ZEBRA_DEBUG_MPLS)
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prefix2str(p, buf, BUFSIZ);
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/* Update existing FEC or create a new one. */
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fec = fec_find (table, p);
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if (!fec)
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{
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fec = fec_add (table, p, in_label, FEC_FLAG_CONFIGURED);
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if (!fec)
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{
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prefix2str(p, buf, BUFSIZ);
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zlog_err ("Failed to add FEC %s upon config", buf);
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return -1;
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}
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if (IS_ZEBRA_DEBUG_MPLS)
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zlog_debug ("Add fec %s label %u", buf, in_label);
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}
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else
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{
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fec->flags |= FEC_FLAG_CONFIGURED;
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if (fec->label == in_label)
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/* Duplicate config */
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return 0;
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if (IS_ZEBRA_DEBUG_MPLS)
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zlog_debug ("Update fec %s new label %u", buf, in_label);
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fec->label = in_label;
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}
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return ret;
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}
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/*
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* Remove static FEC to label binding.
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*/
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int
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zebra_mpls_static_fec_del (struct zebra_vrf *zvrf, struct prefix *p)
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{
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struct route_table *table;
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zebra_fec_t *fec;
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char buf[BUFSIZ];
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table = zvrf->fec_table[family2afi(PREFIX_FAMILY(p))];
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if (!table)
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return -1;
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fec = fec_find (table, p);
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if (!fec)
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{
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prefix2str(p, buf, BUFSIZ);
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zlog_err("Failed to find FEC %s upon delete", buf);
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return -1;
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}
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if (IS_ZEBRA_DEBUG_MPLS)
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{
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prefix2str(p, buf, BUFSIZ);
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zlog_debug ("Delete fec %s", buf);
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}
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fec_del (fec);
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return 0;
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}
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/*
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* Display MPLS FEC to label binding configuration (VTY command handler).
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*/
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int
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zebra_mpls_write_fec_config (struct vty *vty, struct zebra_vrf *zvrf)
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{
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struct route_node *rn;
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int af;
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zebra_fec_t *fec;
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char buf[BUFSIZ];
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int write = 0;
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for (af = AFI_IP; af < AFI_MAX; af++)
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{
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if (zvrf->fec_table[af] == NULL)
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continue;
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for (rn = route_top(zvrf->fec_table[af]); rn; rn = route_next(rn))
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{
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if (!rn->info)
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continue;
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char lstr[BUFSIZ];
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fec = rn->info;
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if (!(fec->flags & FEC_FLAG_CONFIGURED))
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continue;
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write = 1;
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prefix2str(&rn->p, buf, BUFSIZ);
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vty_out(vty, "mpls label bind %s %s%s", buf,
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label2str(fec->label, lstr, BUFSIZ), VTY_NEWLINE);
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}
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}
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return write;
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}
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/*
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* Display MPLS FEC to label binding (VTY command handler).
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*/
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void
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zebra_mpls_print_fec_table (struct vty *vty, struct zebra_vrf *zvrf)
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{
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struct route_node *rn;
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int af;
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for (af = AFI_IP; af < AFI_MAX; af++)
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{
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if (zvrf->fec_table[af] == NULL)
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continue;
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for (rn = route_top(zvrf->fec_table[af]); rn; rn = route_next(rn))
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{
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if (!rn->info)
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continue;
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fec_print (rn->info, vty);
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}
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}
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}
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/*
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* Display MPLS FEC to label binding for a specific FEC (VTY command handler).
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*/
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void
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zebra_mpls_print_fec (struct vty *vty, struct zebra_vrf *zvrf, struct prefix *p)
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{
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struct route_table *table;
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struct route_node *rn;
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table = zvrf->fec_table[family2afi(PREFIX_FAMILY(p))];
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if (!table)
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return;
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apply_mask (p);
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rn = route_node_lookup(table, p);
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if (!rn)
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return;
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route_unlock_node(rn);
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if (!rn->info)
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return;
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fec_print (rn->info, vty);
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}
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/*
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* Install/uninstall a FEC-To-NHLFE (FTN) binding.
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*/
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@ -1927,6 +2232,8 @@ zebra_mpls_init_tables (struct zebra_vrf *zvrf)
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return;
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zvrf->slsp_table = hash_create(label_hash, label_cmp);
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zvrf->lsp_table = hash_create(label_hash, label_cmp);
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zvrf->fec_table[AFI_IP] = route_table_init();
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zvrf->fec_table[AFI_IP6] = route_table_init();
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zvrf->mpls_flags = 0;
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}
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@ -52,6 +52,7 @@ typedef struct zebra_snhlfe_t_ zebra_snhlfe_t;
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typedef struct zebra_slsp_t_ zebra_slsp_t;
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typedef struct zebra_nhlfe_t_ zebra_nhlfe_t;
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typedef struct zebra_lsp_t_ zebra_lsp_t;
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typedef struct zebra_fec_t_ zebra_fec_t;
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/*
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* (Outgoing) nexthop label forwarding entry configuration
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@ -147,6 +148,21 @@ struct zebra_lsp_t_
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u_char addr_family;
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};
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/*
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* FEC to label binding.
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*/
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struct zebra_fec_t_
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{
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/* FEC (prefix) */
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struct route_node *rn;
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/* In-label - either statically bound or derived from label block. */
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mpls_label_t label;
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/* Flags. */
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u_int32_t flags;
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#define FEC_FLAG_CONFIGURED (1 << 0)
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};
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/* Function declarations. */
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@ -164,6 +180,53 @@ char *
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mpls_label2str (u_int8_t num_labels, mpls_label_t *labels,
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char *buf, int len);
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/*
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* Return FEC (if any) to which this label is bound.
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* Note: Only works for per-prefix binding and when the label is not
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* implicit-null.
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* TODO: Currently walks entire table, can optimize later with another
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* hash..
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*/
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zebra_fec_t *
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zebra_mpls_fec_for_label (struct zebra_vrf *zvrf, mpls_label_t label);
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/*
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* Inform if specified label is currently bound to a FEC or not.
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*/
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int
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zebra_mpls_label_already_bound (struct zebra_vrf *zvrf, mpls_label_t label);
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/*
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* Add static FEC to label binding.
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*/
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int
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zebra_mpls_static_fec_add (struct zebra_vrf *zvrf, struct prefix *p,
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mpls_label_t in_label);
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/*
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* Remove static FEC to label binding.
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*/
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int
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zebra_mpls_static_fec_del (struct zebra_vrf *zvrf, struct prefix *p);
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/*
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* Display MPLS FEC to label binding configuration (VTY command handler).
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*/
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int
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zebra_mpls_write_fec_config (struct vty *vty, struct zebra_vrf *zvrf);
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/*
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* Display MPLS FEC to label binding (VTY command handler).
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*/
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void
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zebra_mpls_print_fec_table (struct vty *vty, struct zebra_vrf *zvrf);
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/*
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* Display MPLS FEC to label binding for a specific FEC (VTY command handler).
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*/
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void
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zebra_mpls_print_fec (struct vty *vty, struct zebra_vrf *zvrf, struct prefix *p);
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/*
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* Install/uninstall a FEC-To-NHLFE (FTN) binding.
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*/
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@ -209,6 +209,101 @@ DEFUN (no_mpls_transit_lsp_all,
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return zebra_mpls_transit_lsp (vty, 0, argv[3]->arg, NULL, NULL, NULL);
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}
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static int
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zebra_mpls_bind (struct vty *vty, int add_cmd, const char *prefix,
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const char *label_str)
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{
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struct zebra_vrf *zvrf;
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struct prefix p;
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u_int32_t label;
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int ret;
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zvrf = vrf_info_lookup(VRF_DEFAULT);
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if (!zvrf)
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{
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vty_out (vty, "%% Default VRF does not exist%s", VTY_NEWLINE);
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return CMD_WARNING;
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}
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memset(&p, 0, sizeof(struct prefix));
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ret = str2prefix(prefix, &p);
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if (ret <= 0)
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{
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vty_out (vty, "%% Malformed address%s", VTY_NEWLINE);
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return CMD_WARNING;
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}
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if (add_cmd)
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{
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if (!label_str)
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{
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vty_out (vty, "%% No label binding specified%s", VTY_NEWLINE);
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return CMD_WARNING;
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}
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if (!strcmp(label_str, "implicit-null"))
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label = MPLS_IMP_NULL_LABEL;
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else
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{
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label = atoi(label_str);
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if (!IS_MPLS_UNRESERVED_LABEL(label))
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{
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vty_out (vty, "%% Invalid label%s", VTY_NEWLINE);
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return CMD_WARNING;
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}
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if (zebra_mpls_label_already_bound (zvrf, label))
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{
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vty_out (vty, "%% Label already bound to a FEC%s",
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VTY_NEWLINE);
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return CMD_WARNING;
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}
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}
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|
||||
ret = zebra_mpls_static_fec_add (zvrf, &p, label);
|
||||
}
|
||||
else
|
||||
ret = zebra_mpls_static_fec_del (zvrf, &p);
|
||||
|
||||
if (ret)
|
||||
{
|
||||
vty_out (vty, "%% FEC to label binding cannot be %s%s",
|
||||
add_cmd ? "added" : "deleted", VTY_NEWLINE);
|
||||
return CMD_WARNING;
|
||||
}
|
||||
|
||||
return CMD_SUCCESS;
|
||||
}
|
||||
|
||||
DEFUN (mpls_label_bind,
|
||||
mpls_label_bind_cmd,
|
||||
"mpls label bind <A.B.C.D/M|X:X::X:X/M> <(16-1048575)|implicit-null>",
|
||||
MPLS_STR
|
||||
"Label configuration\n"
|
||||
"Establish FEC to label binding\n"
|
||||
"IPv4 prefix\n"
|
||||
"IPv6 prefix\n"
|
||||
"MPLS Label to bind\n"
|
||||
"Use Implicit-Null Label\n")
|
||||
{
|
||||
return zebra_mpls_bind (vty, 1, argv[3]->arg, argv[4]->arg);
|
||||
}
|
||||
|
||||
DEFUN (no_mpls_label_bind,
|
||||
no_mpls_label_bind_cmd,
|
||||
"no mpls label bind <A.B.C.D/M|X:X::X:X/M> [<(16-1048575)|implicit-null>]",
|
||||
NO_STR
|
||||
MPLS_STR
|
||||
"Label configuration\n"
|
||||
"Establish FEC to label binding\n"
|
||||
"IPv4 prefix\n"
|
||||
"IPv6 prefix\n"
|
||||
"MPLS Label to bind\n"
|
||||
"Use Implicit-Null Label\n")
|
||||
|
||||
{
|
||||
return zebra_mpls_bind (vty, 0, argv[4]->arg, NULL);
|
||||
}
|
||||
|
||||
/* Static route configuration. */
|
||||
DEFUN (ip_route_label,
|
||||
ip_route_label_cmd,
|
||||
@ -777,9 +872,44 @@ zebra_mpls_config (struct vty *vty)
|
||||
return 0;
|
||||
|
||||
write += zebra_mpls_write_lsp_config(vty, zvrf);
|
||||
write += zebra_mpls_write_fec_config(vty, zvrf);
|
||||
return write;
|
||||
}
|
||||
|
||||
DEFUN (show_mpls_fec,
|
||||
show_mpls_fec_cmd,
|
||||
"show mpls fec [<A.B.C.D/M|X:X::X:X/M>]",
|
||||
SHOW_STR
|
||||
MPLS_STR
|
||||
"MPLS FEC table\n"
|
||||
"FEC to display information about\n"
|
||||
"FEC to display information about\n")
|
||||
{
|
||||
struct zebra_vrf *zvrf;
|
||||
struct prefix p;
|
||||
int ret;
|
||||
|
||||
zvrf = vrf_info_lookup(VRF_DEFAULT);
|
||||
if (!zvrf)
|
||||
return 0;
|
||||
|
||||
if (argc == 3)
|
||||
zebra_mpls_print_fec_table(vty, zvrf);
|
||||
else
|
||||
{
|
||||
memset(&p, 0, sizeof(struct prefix));
|
||||
ret = str2prefix(argv[3]->arg, &p);
|
||||
if (ret <= 0)
|
||||
{
|
||||
vty_out (vty, "%% Malformed address%s", VTY_NEWLINE);
|
||||
return CMD_WARNING;
|
||||
}
|
||||
zebra_mpls_print_fec (vty, zvrf, &p);
|
||||
}
|
||||
|
||||
return CMD_SUCCESS;
|
||||
}
|
||||
|
||||
DEFUN (show_mpls_table,
|
||||
show_mpls_table_cmd,
|
||||
"show mpls table [json]",
|
||||
@ -876,7 +1006,10 @@ zebra_mpls_vty_init (void)
|
||||
install_element (CONFIG_NODE, &no_mpls_transit_lsp_cmd);
|
||||
install_element (CONFIG_NODE, &no_mpls_transit_lsp_out_label_cmd);
|
||||
install_element (CONFIG_NODE, &no_mpls_transit_lsp_all_cmd);
|
||||
install_element (CONFIG_NODE, &mpls_label_bind_cmd);
|
||||
install_element (CONFIG_NODE, &no_mpls_label_bind_cmd);
|
||||
|
||||
install_element (VIEW_NODE, &show_mpls_table_cmd);
|
||||
install_element (VIEW_NODE, &show_mpls_table_lsp_cmd);
|
||||
install_element (VIEW_NODE, &show_mpls_fec_cmd);
|
||||
}
|
||||
|
||||
@ -79,6 +79,9 @@ struct zebra_vrf
|
||||
/* MPLS label forwarding table */
|
||||
struct hash *lsp_table;
|
||||
|
||||
/* MPLS FEC binding table */
|
||||
struct route_table *fec_table[AFI_MAX];
|
||||
|
||||
/* MPLS processing flags */
|
||||
u_int16_t mpls_flags;
|
||||
#define MPLS_FLAG_SCHEDULE_LSPS (1 << 0)
|
||||
|
||||
Loading…
Reference in New Issue
Block a user