isisd: added l1 to l2 distibution

added adding prefixes with the best metric from the level-1 db to the level-2 db on l1_l2 end system Signed-off-by: Sososhas <[email protected]> updted for checkout Signed-off-by: Sososhas <[email protected]>
FRRouting · Oct 24, 2023 · dd3de86 · dd3de86
1 parent b6b0001
commit dd3de86
Showing 1 changed file with 56 additions and 0 deletions.
diff --git a/isisd/isis_lsp.c b/isisd/isis_lsp.c
@@ -1369,6 +1369,61 @@ static void lsp_build(struct isis_lsp *lsp, struct isis_area *area)
 				lsp_build_internal_reach_ipv6(lsp, area, ipv6,
 							      metric);
 		}
+
+		struct isis_adjacency *adj;	
+		bool flag = false;
+
+		for (ALL_LIST_ELEMENTS_RO(area->adjacency_list, node, adj)) {
+			if (adj->level == IS_LEVEL_2)
+				flag = true;
+		}
+
+		if (flag && (lsp->level == IS_LEVEL_2) && (area->is_type == IS_LEVEL_1_AND_2) && (lsp->hdr.lsp_bits != LSPBIT_ATT)) {
+			struct isis_lsp *lsp_tmp;
+			struct lspdb_head *head_tmp = &area->lspdb[0];
+
+			if (head_tmp) {
+				frr_each (lspdb, head_tmp, lsp_tmp) {
+					if (strcmp(lsp->tlvs->hostname, lsp_tmp->tlvs->hostname) != 0) {
+						for (struct isis_item *i = lsp_tmp->tlvs->extended_ip_reach.head; i; i = i->next) {
+							struct isis_extended_ip_reach *r = (struct isis_extended_ip_reach *)i;
+							int count = 0;
+
+							for (struct isis_item *l = lsp->tlvs->extended_ip_reach.head; l; l = l->next) {
+								struct isis_extended_ip_reach *rt = (struct isis_extended_ip_reach *)l;
+
+								if (r->prefix.prefix.s_addr == rt->prefix.prefix.s_addr) {
+									if ((r->metric > rt->metric) || (r->metric == rt->metric))
+										count++;
+									break;
+								}
+							}
+							if (count == 0) 
+								lsp_build_internal_reach_ipv4(lsp, area, &r->prefix, r->metric);
+						}
+						for (struct isis_item *i = lsp_tmp->tlvs->ipv6_reach.head; i; i = i->next) {
+							struct isis_ipv6_reach *r = (struct isis_ipv6_reach *)i;	
+							int count = 0;
+
+							for (struct isis_item *l = lsp->tlvs->ipv6_reach.head; l; l = l->next) {
+								struct isis_ipv6_reach *rt = (struct isis_ipv6_reach *) l;
+								char prefixbuf_1[PREFIX2STR_BUFFER];
+								char prefixbuf_2[PREFIX2STR_BUFFER];
+
+								if (strcmp(prefix2str(&r->prefix, prefixbuf_1, sizeof(prefixbuf_1)),
+									prefix2str(&rt->prefix, prefixbuf_2, sizeof(prefixbuf_2))) == 0) {
+									if ((r->metric > rt->metric) || (r->metric == rt->metric))
+										count++;
+									break;
+									}
+                                                        }
+							if (count == 0)
+								lsp_build_internal_reach_ipv6(lsp, area, &r->prefix, r->metric);
+						}
+					}
+				}
+			}
+		}
 
 		switch (circuit->circ_type) {
 		case CIRCUIT_T_BROADCAST:
@@ -1400,6 +1455,7 @@ static void lsp_build(struct isis_lsp *lsp, struct isis_area *area)
 			break;
 		case CIRCUIT_T_P2P: {
 			struct isis_adjacency *nei = circuit->u.p2p.neighbor;
+
 			if (nei && nei->adj_state == ISIS_ADJ_UP
 			    && (level & nei->circuit_t)) {
 				uint8_t ne_id[7];