From 7c2ea458fdc039ecb2b00472b1fec1d73cda5721 Mon Sep 17 00:00:00 2001
From: Sososhas <1248756005hfh@gmail.com>
Date: Fri, 6 Oct 2023 14:02:02 +0300
Subject: [PATCH] added adding prefixes from L1 toL 2 on L1L2 router

---
 isisd/isis_lsp.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)

diff --git a/isisd/isis_lsp.c b/isisd/isis_lsp.c
index 950d5f359c08..e61821e97455 100644
--- a/isisd/isis_lsp.c
+++ b/isisd/isis_lsp.c
@@ -1314,6 +1314,52 @@ static void lsp_build(struct isis_lsp *lsp, struct isis_area *area)
 							      metric);
 		}
 
+               if((lsp->level == IS_LEVEL_2) && (area->is_type == 3) && (lsp->hdr.lsp_bits != LSPBIT_ATT)) {
+                        struct isis_lsp* lsp_tmp_ip;
+			struct isis_lsp* lsp_tmp_ipv6;
+                        struct lspdb_head *head_tmp_ip = &area->lspdb[0];
+			struct lspdb_head *head_tmp_ipv6 = &area->lspdb[0];
+                        if(head_tmp_ip) {
+                                frr_each (lspdb, head_tmp_ip, lsp_tmp_ip) {
+                                        if (strcmp(lsp->tlvs->hostname, lsp_tmp_ip->tlvs->hostname) != 0) {
+                                                for (struct isis_item* i = lsp_tmp_ip->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(prefix_same((struct prefix_ipv4*)&r->prefix,(struct prefix_ipv6*)&rt->prefix)){
+                                                                        count++;
+                                                                        break;
+                                                                }
+                                                        }
+                                                        if (count == 0)
+                                                                lsp_build_internal_reach_ipv4(lsp, area, &r->prefix , r->metric);
+                                                }
+                                        }
+                                }
+                        }
+
+			if(head_tmp_ipv6) {
+                                frr_each (lspdb, head_tmp_ipv6, lsp_tmp_ipv6) {
+                                        if (strcmp(lsp->tlvs->hostname, lsp_tmp_ipv6->tlvs->hostname) != 0) {
+                                                for (struct isis_item* i = lsp_tmp_ipv6->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;
+                                                                if(prefix_same((struct prefix_ipv6*)&r->prefix,(struct prefix_ipv6*)&rt->prefix)){
+                                                                        count++;
+                                                                        break;
+                                                                }
+                                                        }
+                                                        if (count == 0)
+                                                                lsp_build_internal_reach_ipv6(lsp, area, &r->prefix , r->metric);
+                                                }
+                                        }
+                                }
+                        }
+                }
+
 		switch (circuit->circ_type) {
 		case CIRCUIT_T_BROADCAST:
 			if (level & circuit->is_type) {