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]>
FRRouting · Oct 23, 2023 · eb4217b · eb4217b
1 parent 9e32b73
commit eb4217b
Showing 1 changed file with 71 additions and 0 deletions.
diff --git a/isisd/isis_lsp.c b/isisd/isis_lsp.c
@@ -532,6 +532,9 @@ static void lsp_update_data(struct isis_lsp *lsp, struct isis_lsp_hdr *hdr,
 				: IS_LEVEL_1);
 	}
 
+	_lsp_regenerate_schedule(area, lsp->level, 0, false, __func__, __FILE__,
+				 __LINE__);
+
 	return;
 }
 
@@ -1314,6 +1317,74 @@ static void lsp_build(struct isis_lsp *lsp, struct isis_area *area)
 							      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 == 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(r->prefix.prefix.s_addr == rt->prefix.prefix.s_addr) {
+                                                                        if(r->metric > rt->metric)
+                                                                                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;
+								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)
+                                                                        	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) {