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-rw-r--r--bgpd/bgp_table.c245
1 files changed, 245 insertions, 0 deletions
diff --git a/bgpd/bgp_table.c b/bgpd/bgp_table.c
new file mode 100644
index 0000000..8465ada
--- /dev/null
+++ b/bgpd/bgp_table.c
@@ -0,0 +1,245 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* BGP routing table
+ * Copyright (C) 1998, 2001 Kunihiro Ishiguro
+ */
+
+#include <zebra.h>
+
+#include "prefix.h"
+#include "memory.h"
+#include "sockunion.h"
+#include "queue.h"
+#include "filter.h"
+#include "command.h"
+#include "printfrr.h"
+
+#include "bgpd/bgpd.h"
+#include "bgpd/bgp_table.h"
+#include "bgp_addpath.h"
+#include "bgp_trace.h"
+
+void bgp_table_lock(struct bgp_table *rt)
+{
+ rt->lock++;
+}
+
+void bgp_table_unlock(struct bgp_table *rt)
+{
+ assert(rt->lock > 0);
+ rt->lock--;
+
+ if (rt->lock != 0) {
+ return;
+ }
+
+ route_table_finish(rt->route_table);
+ rt->route_table = NULL;
+
+ XFREE(MTYPE_BGP_TABLE, rt);
+}
+
+void bgp_table_finish(struct bgp_table **rt)
+{
+ if (*rt != NULL) {
+ bgp_table_unlock(*rt);
+ *rt = NULL;
+ }
+}
+
+/*
+ * bgp_dest_lock_node
+ */
+struct bgp_dest *bgp_dest_lock_node(struct bgp_dest *dest)
+{
+ frrtrace(1, frr_bgp, bgp_dest_lock, dest);
+ struct route_node *rn = route_lock_node(bgp_dest_to_rnode(dest));
+
+ return bgp_dest_from_rnode(rn);
+}
+
+/*
+ * bgp_dest_get_prefix_str
+ */
+const char *bgp_dest_get_prefix_str(struct bgp_dest *dest)
+{
+ const struct prefix *p = NULL;
+ static char str[PREFIX_STRLEN] = {0};
+
+ p = bgp_dest_get_prefix(dest);
+ if (p)
+ return prefix2str(p, str, sizeof(str));
+
+ return NULL;
+}
+
+/*
+ * bgp_dest_unlock_node
+ */
+inline struct bgp_dest *bgp_dest_unlock_node(struct bgp_dest *dest)
+{
+ frrtrace(1, frr_bgp, bgp_dest_unlock, dest);
+ bgp_delete_listnode(dest);
+ struct route_node *rn = bgp_dest_to_rnode(dest);
+
+ if (rn->lock == 1) {
+ struct bgp_table *rt = bgp_dest_table(dest);
+ if (rt->bgp) {
+ bgp_addpath_free_node_data(&rt->bgp->tx_addpath,
+ &dest->tx_addpath, rt->afi,
+ rt->safi);
+ }
+ XFREE(MTYPE_BGP_NODE, dest);
+ dest = NULL;
+ rn->info = NULL;
+ }
+ route_unlock_node(rn);
+
+ return dest;
+}
+
+/*
+ * bgp_node_destroy
+ */
+static void bgp_node_destroy(route_table_delegate_t *delegate,
+ struct route_table *table, struct route_node *node)
+{
+ struct bgp_dest *dest;
+ struct bgp_table *rt;
+ dest = bgp_dest_from_rnode(node);
+ rt = table->info;
+ if (dest) {
+ if (rt->bgp) {
+ bgp_addpath_free_node_data(&rt->bgp->tx_addpath,
+ &dest->tx_addpath,
+ rt->afi, rt->safi);
+ }
+ XFREE(MTYPE_BGP_NODE, dest);
+ node->info = NULL;
+ }
+
+ XFREE(MTYPE_ROUTE_NODE, node);
+}
+
+/*
+ * Function vector to customize the behavior of the route table
+ * library for BGP route tables.
+ */
+route_table_delegate_t bgp_table_delegate = { .create_node = route_node_create,
+ .destroy_node = bgp_node_destroy };
+
+/*
+ * bgp_table_init
+ */
+struct bgp_table *bgp_table_init(struct bgp *bgp, afi_t afi, safi_t safi)
+{
+ struct bgp_table *rt;
+
+ rt = XCALLOC(MTYPE_BGP_TABLE, sizeof(struct bgp_table));
+
+ rt->route_table = route_table_init_with_delegate(&bgp_table_delegate);
+
+ /*
+ * Set up back pointer to bgp_table.
+ */
+ route_table_set_info(rt->route_table, rt);
+
+ /*
+ * pointer to bgp instance allows working back from bgp_path_info to bgp
+ */
+ rt->bgp = bgp;
+
+ bgp_table_lock(rt);
+ rt->afi = afi;
+ rt->safi = safi;
+
+ return rt;
+}
+
+/* Delete the route node from the selection deferral route list */
+void bgp_delete_listnode(struct bgp_dest *dest)
+{
+ const struct route_node *rn = NULL;
+ struct bgp_table *table = NULL;
+ struct bgp *bgp = NULL;
+ afi_t afi;
+ safi_t safi;
+
+ /* If the route to be deleted is selection pending, update the
+ * route node in gr_info
+ */
+ if (CHECK_FLAG(dest->flags, BGP_NODE_SELECT_DEFER)) {
+ table = bgp_dest_table(dest);
+
+ if (table) {
+ bgp = table->bgp;
+ afi = table->afi;
+ safi = table->safi;
+ } else
+ return;
+
+ rn = bgp_dest_to_rnode(dest);
+
+ if (bgp && rn && rn->lock == 1) {
+ /* Delete the route from the selection pending list */
+ bgp->gr_info[afi][safi].gr_deferred--;
+ UNSET_FLAG(dest->flags, BGP_NODE_SELECT_DEFER);
+ }
+ }
+}
+
+struct bgp_dest *bgp_table_subtree_lookup(const struct bgp_table *table,
+ const struct prefix *p)
+{
+ struct bgp_dest *dest = bgp_dest_from_rnode(table->route_table->top);
+ struct bgp_dest *matched = NULL;
+
+ if (dest == NULL)
+ return NULL;
+
+
+ while (dest) {
+ const struct prefix *dest_p = bgp_dest_get_prefix(dest);
+ struct route_node *node = dest->rn;
+
+ if (dest_p->prefixlen >= p->prefixlen) {
+ if (!prefix_match(p, dest_p))
+ return NULL;
+
+ matched = dest;
+ break;
+ }
+
+ if (!prefix_match(dest_p, p))
+ return NULL;
+
+ if (dest_p->prefixlen == p->prefixlen) {
+ matched = dest;
+ break;
+ }
+
+ dest = bgp_dest_from_rnode(
+ node->link[prefix_bit(&p->u.prefix, dest_p->prefixlen)]);
+ }
+
+ if (!matched)
+ return NULL;
+
+ bgp_dest_lock_node(matched);
+ return matched;
+}
+
+printfrr_ext_autoreg_p("BD", printfrr_bd);
+static ssize_t printfrr_bd(struct fbuf *buf, struct printfrr_eargs *ea,
+ const void *ptr)
+{
+ const struct bgp_dest *dest = ptr;
+ const struct prefix *p = bgp_dest_get_prefix(dest);
+ char cbuf[PREFIX_STRLEN];
+
+ if (!dest)
+ return bputs(buf, "(null)");
+
+ /* need to get the real length even if buffer too small */
+ prefix2str(p, cbuf, sizeof(cbuf));
+ return bputs(buf, cbuf);
+}