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tilfa.c
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/*
* =====================================================================================
*
* Filename: tilfa.c
*
* Description: This file contains the Implementation of TILFA
*
* Version: 1.0
* Created: 12/08/2019 07:04:02 AM
* Revision: none
* Compiler: gcc
*
* Author: Er. Abhishek Sagar, Juniper Networks (https://csepracticals.wixsite.com/csepracticals), sachinites@gmail.com
* Company: Juniper Networks
*
* This file is part of the SPFComputation distribution (https://github.com/sachinites)
* Copyright (c) 2019 Abhishek Sagar.
* This program is free software: you can redistribute it and/or modify it under the terms of the GNU General
* Public License as published by the Free Software Foundation, version 3.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* visit website : https://csepracticals.wixsite.com/csepracticals for more courses and projects
*
* =====================================================================================
*/
#include <stdio.h>
#include "tilfa.h"
#include <assert.h>
#include "gluethread/glthread.h"
#include "complete_spf_path.h"
#include "no_warn.h"
#include "libcli.h"
#include "cmdtlv.h"
#include "spfcmdcodes.h"
#include "spfutil.h"
#include "spftrace.h"
#include "routes.h"
#include <stdint.h>
extern instance_t *instance;
typedef struct fn_ptr_arg_{
tilfa_info_t *tilfa_info;
protected_resource_t *pr_res;
LEVEL level;
} fn_ptr_arg_t;
static ll_t *
tilfa_get_post_convergence_spf_result_list(
tilfa_info_t *tilfa_info, LEVEL level){
return tilfa_info->tilfa_post_convergence_spf_results[level];
}
static ll_t *
tilfa_get_pre_convergence_spf_result_list(
tilfa_info_t *tilfa_info, LEVEL level){
return tilfa_info->tilfa_pre_convergence_spf_results[level];
}
glthread_t *
tilfa_get_post_convergence_spf_path_head(
tilfa_info_t *tilfa_info, LEVEL level){
return &tilfa_info->post_convergence_spf_path[level];
}
static internal_nh_t *
tilfa_lookup_pre_convergence_primary_nexthops
(tilfa_info_t *tilfa_info, node_t *node, LEVEL level){
ll_t *lst = tilfa_get_pre_convergence_spf_result_list(
tilfa_info, level);
spf_result_t *res = singly_ll_search_by_key(lst, (void *)node);
if(!res) return NULL;
return res->next_hop[IPNH];
}
static internal_nh_t *
tilfa_lookup_post_convergence_primary_nexthops
(tilfa_info_t *tilfa_info,
node_t *node,
LEVEL level, nh_type_t nh){
ll_t *lst = tilfa_get_post_convergence_spf_result_list(
tilfa_info, level);
spf_result_t *res = singly_ll_search_by_key(lst, (void *)node);
if(!res) return NULL;
return res->next_hop[nh];
}
static uint32_t
tilfa_dist_from_self(tilfa_info_t *tilfa_info,
node_t *node, LEVEL level){
ll_t *lst = tilfa_get_pre_convergence_spf_result_list(
tilfa_info, level);
spf_result_t *res = singly_ll_search_by_key(lst, (void *)node);
if(!res) return INFINITE_METRIC;
return (uint32_t)res->spf_metric;
}
static ll_t *
tilfa_get_remote_spf_result_lst(tilfa_info_t *tilfa_info,
node_t *node, LEVEL level,
boolean flush_old_lst,
boolean reverse_spf){
singly_ll_node_t *curr = NULL, *prev = NULL;
singly_ll_node_t *curr1 = NULL, *prev1 = NULL;
spf_result_t *spf_res = NULL;
tilfa_remote_spf_result_t *tilfa_rem_spf_result = NULL;
ll_t *inner_lst = NULL;
ll_t *outer_lst = reverse_spf ?
tilfa_info->pre_convergence_remote_reverse_spf_results[level] :
tilfa_info->pre_convergence_remote_forward_spf_results[level];
assert(node);
ITERATE_LIST_BEGIN2(outer_lst, curr, prev){
tilfa_rem_spf_result = curr->data;
if(tilfa_rem_spf_result->node == node){
inner_lst = tilfa_rem_spf_result->rem_spf_result_lst;
if(!flush_old_lst) return inner_lst;
ITERATE_LIST_BEGIN2(inner_lst, curr1, prev1){
spf_res = curr1->data;
XFREE(spf_res);
}ITERATE_LIST_END2(inner_lst, curr1, prev1);
delete_singly_ll(inner_lst);
return inner_lst;
}
} ITERATE_LIST_END2(outer_lst, curr, prev);
tilfa_rem_spf_result = XCALLOC(1, tilfa_remote_spf_result_t);
tilfa_rem_spf_result->node = node;
tilfa_rem_spf_result->rem_spf_result_lst = init_singly_ll();
singly_ll_set_comparison_fn(
tilfa_rem_spf_result->rem_spf_result_lst,
spf_run_result_comparison_fn);
singly_ll_add_node_by_val(outer_lst, (void *)tilfa_rem_spf_result);
return tilfa_rem_spf_result->rem_spf_result_lst;
}
static uint32_t
tilfa_dist_from_x_to_y(tilfa_info_t *tilfa_info,
node_t *x, node_t *y, LEVEL level){
/*Get spf result of remote node X*/
ll_t *x_spf_result_lst =
tilfa_get_remote_spf_result_lst(tilfa_info, x, level, FALSE, FALSE);
if(is_singly_ll_empty(x_spf_result_lst)){
spf_computation(x, &x->spf_info, level,
TILFA_RUN, x_spf_result_lst);
}
spf_result_t *y_res = singly_ll_search_by_key(
x_spf_result_lst, (void *)y);
if(!y_res) return INFINITE_METRIC;
return (uint32_t)y_res->spf_metric;
}
static uint32_t
tilfa_dist_from_x_to_y_reverse_spf(tilfa_info_t *tilfa_info,
node_t *x, node_t *y, LEVEL level){
ll_t *y_spf_result_lst =
tilfa_get_remote_spf_result_lst(tilfa_info, y, level, FALSE, TRUE);
if(is_singly_ll_empty(y_spf_result_lst)){
inverse_topology(instance, level);
spf_computation(y, &y->spf_info, level,
TILFA_RUN, y_spf_result_lst);
inverse_topology(instance, level);
}
spf_result_t *x_res = singly_ll_search_by_key(
y_spf_result_lst, (void *)x);
if(!x_res) return INFINITE_METRIC;
return (uint32_t)x_res->spf_metric;
}
void
init_tilfa(node_t *node){
assert(node->tilfa_info == NULL);
LEVEL level_it;
node->tilfa_info = XCALLOC(1, tilfa_info_t);
node->tilfa_info->tilfa_gl_var.max_segments_allowed = TILFA_MAX_SEGMENTS;
init_glthread(&node->tilfa_info->tilfa_lcl_config_head);
node->tilfa_info->current_resource_pruned = NULL;
for(level_it = LEVEL1; level_it < MAX_LEVEL; level_it++){
node->tilfa_info->tilfa_pre_convergence_spf_results[level_it] =
init_singly_ll();
singly_ll_set_comparison_fn(node->tilfa_info->
tilfa_pre_convergence_spf_results[level_it],
spf_run_result_comparison_fn);
node->tilfa_info->tilfa_post_convergence_spf_results[level_it] = init_singly_ll();
singly_ll_set_comparison_fn(node->tilfa_info->\
tilfa_post_convergence_spf_results[level_it], spf_run_result_comparison_fn);
node->tilfa_info->pre_convergence_remote_reverse_spf_results[level_it] = init_singly_ll();
singly_ll_set_comparison_fn(node->tilfa_info->\
pre_convergence_remote_reverse_spf_results[level_it],
spf_run_result_comparison_fn);
init_glthread(&(node->tilfa_info->post_convergence_spf_path[level_it]));
node->tilfa_info->pre_convergence_remote_forward_spf_results[level_it] = init_singly_ll();
init_glthread(&node->tilfa_info->tilfa_segment_list_head[level_it]);
}
node->tilfa_info->is_tilfa_pruned = FALSE;
}
boolean
tilfa_update_config(node_t *plr_node,
char *protected_link,
boolean link_protection,
boolean node_protection){
glthread_t *curr;
boolean found = FALSE;
boolean config_change = FALSE;
tilfa_lcl_config_t *tilfa_lcl_config = NULL;
tilfa_info_t *tilfa_info = plr_node->tilfa_info;
ITERATE_GLTHREAD_BEGIN(&tilfa_info->tilfa_lcl_config_head, curr){
tilfa_lcl_config =
tilfa_lcl_config_to_config_glue(curr);
if(strncmp(tilfa_lcl_config->protected_link,
protected_link, IF_NAME_SIZE)){
continue;
}
found = TRUE;
break;
} ITERATE_GLTHREAD_END(&tilfa_info->tilfa_lcl_config_head, curr);
if(found){
if(link_protection == TRUE || link_protection == FALSE) {
if(link_protection != tilfa_lcl_config->link_protection){
tilfa_lcl_config->link_protection = link_protection;
config_change = TRUE;
}
}
if(node_protection == TRUE || node_protection == FALSE) {
if(node_protection != tilfa_lcl_config->node_protection){
tilfa_lcl_config->node_protection = node_protection;
config_change = TRUE;
}
}
}
else if(link_protection != DONT_KNOW ||
node_protection != DONT_KNOW){
tilfa_lcl_config = XCALLOC(1, tilfa_lcl_config_t);
strncpy(tilfa_lcl_config->protected_link, protected_link, IF_NAME_SIZE);
tilfa_lcl_config->protected_link[IF_NAME_SIZE -1] = '\0';
if(link_protection == TRUE || link_protection == FALSE)
tilfa_lcl_config->link_protection = link_protection;
if(node_protection == TRUE || node_protection == FALSE)
tilfa_lcl_config->node_protection = node_protection;
init_glthread(&tilfa_lcl_config->config_glue);
glthread_add_next(&tilfa_info->tilfa_lcl_config_head,
&tilfa_lcl_config->config_glue);
config_change = TRUE;
}
if(tilfa_lcl_config->node_protection == FALSE &&
tilfa_lcl_config->link_protection == FALSE){
remove_glthread(&tilfa_lcl_config->config_glue);
XFREE(tilfa_lcl_config);
config_change = TRUE;
}
return config_change;
}
void
show_tilfa_database(node_t *node){
int i = 0;
glthread_t *curr = NULL;
tilfa_lcl_config_t *tilfa_lcl_config = NULL;
tilfa_segment_list_t *tilfa_segment_list = NULL;
tilfa_info_t *tilfa_info = node->tilfa_info;
if(!tilfa_info) return;
#if 0
if(!tilfa_info->tilfa_gl_var.is_enabled){
printf("Tilfa Status : Disabled");
return;
}
#endif
printf("Tilfa Globals : \n");
printf("\tmax_segments_allowed = %d\n",
tilfa_info->tilfa_gl_var.max_segments_allowed);
printf("\tTilfa Config : \n");
ITERATE_GLTHREAD_BEGIN(&tilfa_info->tilfa_lcl_config_head, curr){
tilfa_lcl_config =
tilfa_lcl_config_to_config_glue(curr);
printf("\t\t link protected : %s LP : %sset : NP : %sset\n",
tilfa_lcl_config->protected_link,
tilfa_lcl_config->link_protection ? "" : "un",
tilfa_lcl_config->node_protection ? "" : "un");
} ITERATE_GLTHREAD_END(&tilfa_info->tilfa_lcl_config_head, curr);
printf("\tTilfa Results:\n");
LEVEL level_it;
for(level_it = LEVEL1; level_it < MAX_LEVEL; level_it++){
ITERATE_GLTHREAD_BEGIN(&tilfa_info->tilfa_segment_list_head[level_it], curr){
tilfa_segment_list = tilfa_segment_list_to_gensegment_list(curr);
printf("\t\tProtected Resource Name : (%s)%s, Dest Protected : %s\n",
tilfa_segment_list->pr_res->plr_node->node_name,
tilfa_segment_list->pr_res->protected_link->intf_name,
tilfa_segment_list->dest->node_name);
printf("\t\tProtection type : LP : %sset NP : %sset\n",
tilfa_segment_list->pr_res->link_protection ? "" : "un",
tilfa_segment_list->pr_res->node_protection ? "" : "un");
printf("\t\t%s, n_segment_list = %d\n",
get_str_level(level_it), tilfa_segment_list->n_segment_list);
for(i = 0 ; i < tilfa_segment_list->n_segment_list; i++){
printf("%s\n", tilfa_print_one_liner_segment_list
(&tilfa_segment_list->gen_segment_list[i], TRUE, TRUE));
}
} ITERATE_GLTHREAD_END(&tilfa_info->tilfa_segment_list_head[level_it], curr);
}
}
void
tilfa_clear_post_convergence_spf_path(
glthread_t *post_convergence_spf_path_head){
glthread_t *curr = NULL, *curr1= NULL;
spf_path_result_t *spf_path_result = NULL;
pred_info_t *pred_info = NULL;
ITERATE_GLTHREAD_BEGIN(post_convergence_spf_path_head, curr){
spf_path_result = glthread_to_spf_path_result(curr);
ITERATE_GLTHREAD_BEGIN(&spf_path_result->pred_db, curr1){
pred_info = glthread_to_pred_info(curr1);
remove_glthread(&pred_info->glue);
XFREE(pred_info);
} ITERATE_GLTHREAD_END(&spf_path_result->pred_db, curr1);
remove_glthread(&spf_path_result->glue);
XFREE(spf_path_result);
} ITERATE_GLTHREAD_END(post_convergence_spf_path_head, curr);
init_glthread(post_convergence_spf_path_head);
}
static void
tilfa_clear_segments_list(
glthread_t *tilfa_segment_list_head,
protected_resource_t *pr_res){
glthread_t *curr;
tilfa_segment_list_t *tilfa_segment_list = NULL;
ITERATE_GLTHREAD_BEGIN(tilfa_segment_list_head, curr){
tilfa_segment_list = tilfa_segment_list_to_gensegment_list(curr);
if(!pr_res){
remove_glthread(&tilfa_segment_list->gen_segment_list_glue);
tilfa_unlock_protected_resource(tilfa_segment_list->pr_res);
XFREE(tilfa_segment_list);
tilfa_segment_list = NULL;
continue;
}
else if(tlfa_protected_resource_equal(tilfa_segment_list->pr_res,
pr_res)){
remove_glthread(&tilfa_segment_list->gen_segment_list_glue);
tilfa_unlock_protected_resource(tilfa_segment_list->pr_res);
XFREE(tilfa_segment_list);
tilfa_segment_list = NULL;
return;
}
} ITERATE_GLTHREAD_END(tilfa_segment_list_head, curr);
}
static void
tilfa_clear_all_pre_convergence_results(node_t *node, LEVEL level){
tilfa_info_t *tilfa_info = node->tilfa_info;
if(!tilfa_info) return;
singly_ll_node_t *list_node = NULL;
spf_result_t *result = NULL;
ITERATE_LIST_BEGIN(tilfa_info->tilfa_pre_convergence_spf_results[level], list_node){
result = list_node->data;
XFREE(result);
result = NULL;
}ITERATE_LIST_END;
delete_singly_ll(tilfa_info->tilfa_pre_convergence_spf_results[level]);
tilfa_clear_preconvergence_remote_spf_results(tilfa_info, 0, level, FALSE);
tilfa_clear_preconvergence_remote_spf_results(tilfa_info, 0, level, TRUE);
tilfa_clear_segments_list(&(tilfa_info->tilfa_segment_list_head[level]), 0);
}
static void
tilfa_clear_all_post_convergence_results(node_t *spf_root, LEVEL level,
protected_resource_t *pr_res){
tilfa_info_t *tilfa_info = spf_root->tilfa_info;
if(!tilfa_info) return;
singly_ll_node_t *list_node = NULL;
spf_result_t *result = NULL;
ITERATE_LIST_BEGIN(tilfa_info->tilfa_post_convergence_spf_results[level], list_node){
result = list_node->data;
XFREE(result);
result = NULL;
}ITERATE_LIST_END;
delete_singly_ll(tilfa_info->tilfa_post_convergence_spf_results[level]);
tilfa_clear_post_convergence_spf_path(
tilfa_get_post_convergence_spf_path_head(spf_root->tilfa_info, level));
tilfa_clear_segments_list(&(tilfa_info->tilfa_segment_list_head[level]), pr_res);
}
boolean
tilfa_topology_prune_protected_resource(node_t *node,
protected_resource_t *pr_res){
assert(pr_res);
assert(pr_res->plr_node == node);
edge_t *link = GET_EGDE_PTR_FROM_FROM_EDGE_END(pr_res->protected_link);
if(pr_res->link_protection){
link->is_tilfa_pruned = TRUE;
}
if(pr_res->node_protection){
node_t *nbr_node = link->to.node;
nbr_node->tilfa_info->is_tilfa_pruned = TRUE;
}
return TRUE;
}
void
tilfa_topology_unprune_protected_resource(node_t *node,
protected_resource_t *pr_res){
assert(pr_res);
assert(pr_res->plr_node == node);
edge_t *link = GET_EGDE_PTR_FROM_FROM_EDGE_END(pr_res->protected_link);
link->is_tilfa_pruned = FALSE;
node_t *nbr_node = link->to.node;
nbr_node->tilfa_info->is_tilfa_pruned = FALSE;
}
static void
compute_tilfa_post_convergence_spf_primary_nexthops(node_t *spf_root, LEVEL level){
assert(is_singly_ll_empty(tilfa_get_post_convergence_spf_result_list
(spf_root->tilfa_info, level)));
spf_computation(spf_root, &spf_root->spf_info, level,
TILFA_RUN, tilfa_get_post_convergence_spf_result_list(spf_root->tilfa_info, level));
}
static void
compute_tilfa_pre_convergence_spf_primary_nexthops(node_t *spf_root, LEVEL level){
assert(is_singly_ll_empty(tilfa_get_pre_convergence_spf_result_list(
spf_root->tilfa_info, level)));
spf_computation(spf_root, &spf_root->spf_info, level,
TILFA_RUN, tilfa_get_pre_convergence_spf_result_list(spf_root->tilfa_info, level));
}
spf_path_result_t *
tilfa_lookup_spf_path_result(node_t *node, node_t *candidate_node,
LEVEL level){
glthread_t *curr = NULL;
ITERATE_GLTHREAD_BEGIN(&node->tilfa_info->post_convergence_spf_path[level], curr){
spf_path_result_t *spf_path_result = glthread_to_spf_path_result(curr);
if(spf_path_result->node == candidate_node){
return spf_path_result;
}
} ITERATE_GLTHREAD_END(&node->tilfa_info->post_convergence_spf_path[level], curr);
return NULL;
}
static void
tilfa_fill_protected_resource_from_config(node_t *plr_node,
protected_resource_t **pr_res,
tilfa_lcl_config_t *tilfa_lcl_config){
protected_resource_t *temp_pr_res =
XCALLOC(1, protected_resource_t);
temp_pr_res->plr_node = plr_node;
temp_pr_res->protected_link = get_interface_from_intf_name(plr_node,
tilfa_lcl_config->protected_link);
if(!temp_pr_res->protected_link){
temp_pr_res->plr_node = NULL;
XFREE(temp_pr_res);
return;
}
temp_pr_res->link_protection = tilfa_lcl_config->link_protection;
temp_pr_res->node_protection = tilfa_lcl_config->node_protection;
if(*pr_res){
tilfa_unlock_protected_resource(*pr_res);
}
*pr_res = temp_pr_res;
tilfa_lock_protected_resource(*pr_res);
}
void
compute_tilfa(node_t *spf_root, LEVEL level){
tilfa_info_t *tilfa_info = spf_root->tilfa_info;
if(!tilfa_info) return;
#if 0
if(!tilfa_info->tilfa_gl_var.is_enabled){
return;
}
#endif
glthread_t *curr;
tilfa_lcl_config_t *tilfa_lcl_config = NULL;
sprintf(instance->traceopts->b, "Node : %s : %s() triggered, level %s",
spf_root->node_name, __FUNCTION__, get_str_level(level));
trace(instance->traceopts, SPF_EVENTS_BIT);
tilfa_clear_all_pre_convergence_results(spf_root, level);
if(IS_GLTHREAD_LIST_EMPTY(&tilfa_info->tilfa_lcl_config_head))
return;
compute_tilfa_pre_convergence_spf_primary_nexthops(spf_root, level);
ITERATE_GLTHREAD_BEGIN(&tilfa_info->tilfa_lcl_config_head, curr){
tilfa_lcl_config = tilfa_lcl_config_to_config_glue(curr);
tilfa_fill_protected_resource_from_config(spf_root,
&tilfa_info->current_resource_pruned,
tilfa_lcl_config);
if(tilfa_info->current_resource_pruned &&
tilfa_info->current_resource_pruned->protected_link){
tilfa_run_post_convergence_spf(spf_root, level,
tilfa_info->current_resource_pruned);
}
} ITERATE_GLTHREAD_END(&tilfa_info->tilfa_lcl_config_head, curr);
}
/* Pass node as NULL to clear remote spf results of all
* nodes. Pass reverse_spf as TRUE or FALSE to clear remote
* spf results for forward or reverse spf run*/
void
tilfa_clear_preconvergence_remote_spf_results(tilfa_info_t *tilfa_info,
node_t *node, LEVEL level,
boolean reverse_spf){
singly_ll_node_t *curr = NULL, *prev = NULL;
singly_ll_node_t *curr1 = NULL, *prev1 = NULL;
spf_result_t *spf_res = NULL;
tilfa_remote_spf_result_t *tilfa_rem_spf_result = NULL;
ll_t *inner_lst = NULL;
ll_t *outer_lst = reverse_spf ?
tilfa_info->pre_convergence_remote_reverse_spf_results[level]:
tilfa_info->pre_convergence_remote_forward_spf_results[level];
ITERATE_LIST_BEGIN2(outer_lst, curr, prev){
tilfa_rem_spf_result = curr->data;
if(node && tilfa_rem_spf_result->node != node){
ITERATE_LIST_CONTINUE2(outer_lst, curr, prev);
}
inner_lst = tilfa_rem_spf_result->rem_spf_result_lst;
ITERATE_LIST_BEGIN2(inner_lst, curr1, prev1){
spf_res = curr1->data;
XFREE(spf_res);
curr1->data = NULL;
} ITERATE_LIST_END2(inner_lst, curr1, prev1);
delete_singly_ll(inner_lst);
XFREE(inner_lst);
tilfa_rem_spf_result->rem_spf_result_lst = NULL;
XFREE(tilfa_rem_spf_result);
ITERATIVE_LIST_NODE_DELETE2(outer_lst, curr, prev);
if(node) return;
} ITERATE_LIST_END2(outer_lst, curr, prev);
if(!node){
assert(is_singly_ll_empty(outer_lst));
}
}
spf_path_result_t *
TILFA_GET_SPF_PATH_RESULT(node_t *spf_root, node_t *node, LEVEL level){
glthread_t *curr = NULL;
glthread_t *spf_path_head =
tilfa_get_post_convergence_spf_path_head(spf_root->tilfa_info, level);
ITERATE_GLTHREAD_BEGIN(spf_path_head, curr){
spf_path_result_t *spf_path_result = glthread_to_spf_path_result(curr);
if(spf_path_result->node == node){
return spf_path_result;
}
} ITERATE_GLTHREAD_END(spf_path_head, curr);
return NULL;
}
/*Tilfa CLI handlers*/
int
show_tilfa_handler(param_t *param,
ser_buff_t *tlv_buf,
op_mode enable_or_disable){
int cmdcode = -1;
node_t *node = NULL;
char *node_name = NULL;
tlv_struct_t *tlv = NULL;
TLV_LOOP_BEGIN(tlv_buf, tlv){
if(strncmp(tlv->leaf_id, "node-name", strlen("node-name")) ==0)
node_name = tlv->value;
else
assert(0);
}TLV_LOOP_END
cmdcode = EXTRACT_CMD_CODE(tlv_buf);
node = (node_t *)singly_ll_search_by_key(
instance->instance_node_list, node_name);
switch(cmdcode){
case CMDCODE_DEBUG_SHOW_TILFA:
show_tilfa_database(node);
break;
default:
assert(0);
}
return 0;
}
boolean
tilfa_is_link_pruned(edge_t *edge){
return edge->is_tilfa_pruned;
}
boolean
tilfa_is_node_pruned(node_t *node){
return node->tilfa_info->is_tilfa_pruned;
}
/*Code Duplicacy detected !!*/
static boolean
tilfa_does_nexthop_overlap(internal_nh_t *one_nh,
internal_nh_t *nh_lst){
if(is_nh_list_empty2(nh_lst))
return FALSE;
int i = 0;
for(; i < MAX_NXT_HOPS; i++){
if(is_empty_internal_nh(&nh_lst[i]))
return FALSE;
switch(nh_lst[i].nh_type){
case UNICAST:
switch(one_nh->nh_type){
case UNICAST:
if(one_nh->oif == nh_lst[i].oif)
return TRUE;
break;
case LSP:
if(one_nh->oif == nh_lst[i].oif)
return TRUE;
break;
default:
;
}
break;
case LSP:
switch(one_nh->nh_type){
case UNICAST:
if(one_nh->oif == nh_lst[i].oif)
return TRUE;
break;
case LSP:
if(one_nh->oif == nh_lst[i].oif)
return TRUE;
break;
default:
;
}
break;
default:
;
}
}
return FALSE;
}
static boolean
tilfa_does_nexthop_overlap2(internal_nh_t *one_nh,
internal_nh_t **nh_lst){
int i = 0;
//return FALSE;
for(; i < MAX_NXT_HOPS; i++){
if(!nh_lst[i]) return FALSE;
switch(nh_lst[i]->nh_type){
case UNICAST:
switch(one_nh->nh_type){
case UNICAST:
if(one_nh->oif == nh_lst[i]->oif)
return TRUE;
break;
case LSP:
if(one_nh->oif == nh_lst[i]->oif)
return TRUE;
break;
default:
;
}
break;
case LSP:
switch(one_nh->nh_type){
case UNICAST:
if(one_nh->oif == nh_lst[i]->oif)
return TRUE;
break;
case LSP:
if(one_nh->oif == nh_lst[i]->oif)
return TRUE;
break;
default:
;
}
break;
default:
;
}
}
return FALSE;
}
static int
tilfa_compute_first_hop_segments(node_t *spf_root,
node_t *first_hop_node,
internal_nh_t *dst_pre_convergence_nhps,
internal_nh_t **first_hop_segments,
LEVEL level){
int i = 0, n = 0;
spf_result_t *res = NULL;
internal_nh_t *first_hop_segment = NULL;
internal_nh_t *first_hop_segment_array = NULL;
tilfa_info_t *tilfa_info = spf_root->tilfa_info;
nh_type_t nh = LSPNH;
memset(first_hop_segments, 0,
sizeof(internal_nh_t *) * MAX_NXT_HOPS);
/* First collect RSVP LSP NHs, followed
* by IPNH. This is done to reject IPNHs over
* RSVP LSP NHs in case of conflicts*/
do{
first_hop_segment_array =
tilfa_lookup_post_convergence_primary_nexthops(tilfa_info,
first_hop_node, level, nh);
assert(first_hop_segment_array);
for( i = 0; i < MAX_NXT_HOPS; i++){
first_hop_segment = &first_hop_segment_array[i];
if(is_internal_nh_t_empty((*first_hop_segment))){
break;
}
if(first_hop_segment->node != first_hop_node)
continue;
if(tilfa_does_nexthop_overlap(first_hop_segment,
dst_pre_convergence_nhps))
continue;
/* Weed out conflicting nexthops. For example,
* Two RSVP LSPs can go out of same physical interface
* Or RSVP LSP oif can coincide with IPNH*/
if(tilfa_does_nexthop_overlap2(first_hop_segment,
first_hop_segments)) /*This needs to be addressed, incompatible arg passed*/
continue;
first_hop_segments[n++] = first_hop_segment;
if(n == MAX_NXT_HOPS) return n;
}
if(nh == LSPNH)
nh = IPNH;
else break;
}while(1);
return n;
}
static boolean
tilfa_p_node_qualification_test_wrt_root(
node_t *spf_root,
node_t *node_to_test,
node_t *first_hop_node,
node_t *dst_node,
protected_resource_t *pr_res,
LEVEL level,
internal_nh_t **first_hop_segments){
tilfa_info_t *tilfa_info = spf_root->tilfa_info;
internal_nh_t *dst_pre_convergence_nhps =
tilfa_lookup_pre_convergence_primary_nexthops(tilfa_info,
dst_node, level);
if(!dst_pre_convergence_nhps ||
is_nh_list_empty2(dst_pre_convergence_nhps)){
sprintf(instance->traceopts->b, "%s() : Root : %s, node_to_test : %s, dst_node : %s, "
"first_hop_node : %s, level %s. Result : %s", __FUNCTION__, spf_root->node_name,
node_to_test->node_name, dst_node->node_name, get_str_level(level),
"FAILED. Reason : No Pre-convergence Primary Nexthops for Destination");
trace(instance->traceopts, TILFA_BIT);
return FALSE;
}
/* Now check if node_to_test is a p-node from first_hop_node
* of spf_root*/
if(node_to_test == first_hop_node){
/*node_to_test is already a p-node*/
return (tilfa_compute_first_hop_segments(spf_root,
first_hop_node,
dst_pre_convergence_nhps,
first_hop_segments, level) != 0);
}
edge_t *edge = GET_EGDE_PTR_FROM_EDGE_END(
pr_res->protected_link);
node_t *protected_node = edge->to.node;
/*Now test p-node condition*/
uint32_t dist_nbr_to_pnode = tilfa_dist_from_x_to_y(
tilfa_info, first_hop_node, node_to_test , level);
uint32_t dist_nbr_to_S = tilfa_dist_from_x_to_y(
tilfa_info, first_hop_node, spf_root, level);
uint32_t dist_S_to_pnode = tilfa_dist_from_self(
tilfa_info, node_to_test, level);
/*loop XFREE wrt Source*/
if(!(dist_nbr_to_pnode < dist_nbr_to_S + dist_S_to_pnode)){
sprintf(instance->traceopts->b, "%s() : Root : %s, node_to_test : %s, dst_node : %s, "
"first_hop_node : %s, level %s. Result : %s", __FUNCTION__, spf_root->node_name,
node_to_test->node_name, dst_node->node_name, first_hop_node->node_name, get_str_level(level),
"FAILED. Reason : No Loop free wrt Source");
trace(instance->traceopts, TILFA_BIT);
return FALSE;
}
/*I think downstream criteria is automatically met since the
* p-node lies on post-convergence path*/
uint32_t dist_E_to_pnode = tilfa_dist_from_x_to_y(
tilfa_info, protected_node, node_to_test, level);
if(pr_res->node_protection){
uint32_t dist_nbr_to_E = tilfa_dist_from_x_to_y(
tilfa_info, first_hop_node, protected_node, level);
if(dist_nbr_to_pnode < dist_nbr_to_E + dist_E_to_pnode){
/* node_to_test is qualified to be p-node through
* first_hop_node*/
return (tilfa_compute_first_hop_segments(spf_root,
first_hop_node,
dst_pre_convergence_nhps,
first_hop_segments, level) != 0);
}
else{
sprintf(instance->traceopts->b, "%s() : Root : %s, node_to_test : %s, dst_node : %s, "
"first_hop_node : %s, level %s. Result : %s", __FUNCTION__, spf_root->node_name,
node_to_test->node_name, dst_node->node_name, first_hop_node->node_name, get_str_level(level),
"FAILED. Reason : Node Protection not provided");
trace(instance->traceopts, TILFA_BIT);
}
}
if(pr_res->link_protection){
if(dist_nbr_to_pnode <
(dist_nbr_to_S + edge->metric[level] + dist_E_to_pnode)){
/* node_to_test is qualified to be p-node through
* first_hop_node*/
return (tilfa_compute_first_hop_segments(spf_root,
first_hop_node,
dst_pre_convergence_nhps,
first_hop_segments, level) != 0);
}
else{
sprintf(instance->traceopts->b, "%s() : Root : %s, node_to_test : %s, dst_node : %s, "
"first_hop_node : %s, level %s. Result : %s", __FUNCTION__, spf_root->node_name,
node_to_test->node_name, dst_node->node_name, get_str_level(level),
first_hop_node->node_name, "FAILED. Reason : Link Protection not provided");
trace(instance->traceopts, TILFA_BIT);
}
}
return FALSE;
}
static boolean
tilfa_q_node_qualification_test_wrt_destination(
node_t *spf_root,
node_t *node_to_test,
node_t *destination,
protected_resource_t *pr_res,