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nlsr_route.c
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nlsr_route.c
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#include <stdio.h>
#include <string.h>
#include <math.h>
#include <stdlib.h>
#include <unistd.h>
#include <getopt.h>
#include <sys/time.h>
#include <assert.h>
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <sys/types.h>
#include <ccn/ccn.h>
#include <ccn/uri.h>
#include <ccn/keystore.h>
#include <ccn/signing.h>
#include <ccn/schedule.h>
#include <ccn/hashtb.h>
#include "nlsr.h"
#include "nlsr_route.h"
#include "nlsr_lsdb.h"
#include "nlsr_npt.h"
#include "nlsr_adl.h"
#include "nlsr_fib.h"
#include "utility.h"
int
route_calculate(struct ccn_schedule *sched, void *clienth, struct ccn_scheduled_event *ev, int flags)
{
if(flags == CCN_SCHEDULE_CANCEL)
{
return -1;
}
nlsr_lock();
if ( nlsr->debugging )
printf("route_calculate called\n");
if ( nlsr->detailed_logging )
writeLogg(__FILE__,__FUNCTION__,__LINE__,"route_calculate called\n");
if( ! nlsr->is_build_adj_lsa_sheduled )
{
/* Calculate Route here */
print_routing_table();
print_npt();
//struct hashtb_param param_me = {0};
nlsr->map = hashtb_create(sizeof(struct map_entry), NULL);
nlsr->rev_map = hashtb_create(sizeof(struct map_entry), NULL);
make_map();
assign_mapping_number();
print_map();
print_rev_map();
do_old_routing_table_updates();
clear_old_routing_table();
print_routing_table();
print_npt();
int i;
int **adj_matrix;
int map_element=hashtb_n(nlsr->map);
adj_matrix=malloc(map_element * sizeof(int *));
for(i = 0; i < map_element; i++)
{
adj_matrix[i] = malloc(map_element * sizeof(int));
}
make_adj_matrix(adj_matrix,map_element);
if ( nlsr->debugging )
print_adj_matrix(adj_matrix,map_element);
long int source=get_mapping_no(nlsr->router_name);
int num_link=get_no_link_from_adj_matrix(adj_matrix, map_element ,source);
if ( nlsr->is_hyperbolic_calc == 1)
{
long int *links=(long int *)malloc(num_link*sizeof(long int));
long int *link_costs=(long int *)malloc(num_link*sizeof(long int));
get_links_from_adj_matrix(adj_matrix, map_element , links, link_costs, source);
struct hashtb_enumerator ee;
struct hashtb_enumerator *e = ⅇ
for (hashtb_start(nlsr->rev_map, e); e->key != NULL; hashtb_next(e))
{
struct map_entry *me=e->data;
if ( me->mapping != source )
{
long int *faces=(long int *)calloc(num_link,sizeof(long int));
double *nbr_dist=(double *)calloc(num_link,sizeof(double));
double *nbr_to_dest=(double *)calloc(num_link,sizeof(double));
for ( i=0 ; i < num_link; i++)
{
int face=get_next_hop_face_from_adl(get_router_from_rev_map(links[i]));
double dist_to_nbr=get_hyperbolic_distance(source,links[i]);
double dist_to_dest_from_nbr=get_hyperbolic_distance(links[i],me->mapping);
faces[i]=face;
nbr_dist[i]=dist_to_nbr;
nbr_to_dest[i]= dist_to_dest_from_nbr;
}
sort_hyperbolic_route(nbr_to_dest,nbr_dist, faces,0,num_link);
if (nlsr->max_faces_per_prefix == 0 )
{
for ( i=0 ; i < num_link; i++)
{
update_routing_table_with_new_hyperbolic_route(me->mapping,faces[i],nbr_to_dest[i]);
}
}
else if ( nlsr->max_faces_per_prefix > 0 )
{
if ( num_link <= nlsr->max_faces_per_prefix )
{
for ( i=0 ; i < num_link; i++)
{
update_routing_table_with_new_hyperbolic_route(me->mapping,faces[i],nbr_to_dest[i]);
}
}
else if (num_link > nlsr->max_faces_per_prefix)
{
for ( i=0 ; i < nlsr->max_faces_per_prefix; i++)
{
update_routing_table_with_new_hyperbolic_route(me->mapping,faces[i],nbr_to_dest[i]);
}
}
}
free(faces);
free(nbr_dist);
free(nbr_to_dest);
}
}
hashtb_end(e);
free(links);
free(link_costs);
}
else if (nlsr->is_hyperbolic_calc == 0 )
{
long int *parent=(long int *)malloc(map_element * sizeof(long int));
long int *dist=(long int *)malloc(map_element * sizeof(long int));
if ( (num_link == 0) || (nlsr->max_faces_per_prefix == 1 ) )
{
calculate_path(adj_matrix,parent,dist, map_element, source);
print_all_path_from_source(parent,source);
print_all_next_hop(parent,source);
update_routing_table_with_new_route(parent, dist,source);
}
else if ( (num_link != 0) && (nlsr->max_faces_per_prefix == 0 || nlsr->max_faces_per_prefix > 1 ) )
{
long int *links=(long int *)malloc(num_link*sizeof(long int));
long int *link_costs=(long int *)malloc(num_link*sizeof(long int));
get_links_from_adj_matrix(adj_matrix, map_element , links, link_costs, source);
for ( i=0 ; i < num_link; i++)
{
adjust_adj_matrix(adj_matrix, map_element,source,links[i],link_costs[i]);
calculate_path(adj_matrix,parent,dist, map_element, source);
print_all_path_from_source(parent,source);
print_all_next_hop(parent,source);
update_routing_table_with_new_route(parent, dist,source);
}
free(links);
free(link_costs);
}
free(parent);
free(dist);
}
print_routing_table();
print_npt();
update_npt_with_new_route();
print_routing_table();
print_npt();
for(i = 0; i < map_element; i++)
{
free(adj_matrix[i]);
}
free(adj_matrix);
destroy_map();
destroy_rev_map();
//hashtb_destroy(&nlsr->map);
//hashtb_destroy(&nlsr->rev_map);
}
nlsr->is_route_calculation_scheduled=0;
nlsr_unlock();
return 0;
}
void
calculate_path(int **adj_matrix, long int *parent,long int *dist ,long int V, long int S)
{
int i;
long int v,u;
//long int *dist=(long int *)malloc(V * sizeof(long int));
long int *Q=(long int *)malloc(V * sizeof(long int));
long int head=0;
/* Initiate the Parent */
for (i = 0 ; i < V; i++)
{
parent[i]=EMPTY_PARENT;
dist[i]=INF_DISTANCE;
Q[i]=i;
}
if ( S != NO_MAPPING_NUM )
{
dist[S]=0;
sort_queue_by_distance(Q,dist,head,V);
while (head < V )
{
u=Q[head];
if(dist[u] == INF_DISTANCE)
{
break;
}
for(v=0 ; v <V; v++)
{
if( adj_matrix[u][v] > 0 ) //
{
if ( is_not_explored(Q,v,head+1,V) )
{
if( dist[u] + adj_matrix[u][v] < dist[v])
{
dist[v]=dist[u] + adj_matrix[u][v] ;
parent[v]=u;
}
}
}
}
head++;
sort_queue_by_distance(Q,dist,head,V);
}
}
free(Q);
}
void
print_all_path_from_source(long int *parent,long int source)
{
int i, map_element;
struct map_entry *me;
struct hashtb_enumerator ee;
struct hashtb_enumerator *e = ⅇ
hashtb_start(nlsr->map, e);
map_element=hashtb_n(nlsr->map);
if ( source != NO_MAPPING_NUM)
{
for(i=0;i<map_element;i++)
{
me=e->data;
if(me->mapping != source)
{
if ( nlsr->debugging )
{
print_path(parent,(long int)me->mapping);
printf("\n");
}
if ( nlsr->detailed_logging )
{
print_path(parent,(long int)me->mapping);
writeLogg(__FILE__,__FUNCTION__,__LINE__,"\n");
}
}
hashtb_next(e);
}
}
hashtb_end(e);
}
void
print_all_next_hop(long int *parent,long int source)
{
int i, map_element;
struct map_entry *me;
struct hashtb_enumerator ee;
struct hashtb_enumerator *e = ⅇ
hashtb_start(nlsr->map, e);
map_element=hashtb_n(nlsr->map);
for(i=0;i<map_element;i++)
{
me=e->data;
if(me->mapping != source)
{
if ( nlsr->debugging )
printf("Dest: %d Next Hop: %ld\n",me->mapping,get_next_hop_from_calculation(parent,me->mapping,source));
if ( nlsr->detailed_logging )
writeLogg(__FILE__,__FUNCTION__,__LINE__,"Dest: %d Next Hop: %ld\n",me->mapping,get_next_hop_from_calculation(parent,me->mapping,source));
}
hashtb_next(e);
}
hashtb_end(e);
}
long int
get_next_hop_from_calculation(long int *parent, long int dest,long int source)
{
long int next_hop;
while ( parent[dest] != EMPTY_PARENT )
{
next_hop=dest;
dest=parent[dest];
}
if ( dest != source )
{
next_hop=NO_NEXT_HOP;
}
return next_hop;
}
void
print_path(long int *parent, long int dest)
{
if (parent[dest] != EMPTY_PARENT )
print_path(parent,parent[dest]);
if ( nlsr->debugging )
printf(" %ld",dest);
}
int
is_not_explored(long int *Q, long int u,long int start, long int element)
{
int ret=0;
long int i;
for(i=start; i< element; i++)
{
if ( Q[i] == u )
{
ret=1;
break;
}
}
return ret;
}
void
sort_queue_by_distance(long int *Q,long int *dist,long int start,long int element)
{
long int i,j;
long int temp_u;
for ( i=start ; i < element ; i ++)
{
for( j=i+1; j<element; j ++)
{
if (dist[Q[j]] < dist[Q[i]])
{
temp_u=Q[j];
Q[j]=Q[i];
Q[i]=temp_u;
}
}
}
}
void
sort_hyperbolic_route(double *dist_dest,double *dist_nbr, long int *faces,long int start,long int element)
{
long int i,j;
double temp_dist;
long int temp_face;
for ( i=start ; i < element ; i ++)
{
for( j=i+1; j<element; j ++)
{
if (dist_dest[i] < dist_dest[j])
{
temp_dist=dist_dest[j];
dist_dest[j]=dist_dest[i];
dist_dest[i]=temp_dist;
temp_dist=dist_nbr[j];
dist_nbr[j]=dist_nbr[i];
dist_nbr[i]=temp_dist;
temp_face=faces[j];
faces[j]=faces[i];
faces[i]=temp_face;
}
if ( (dist_dest[i] == dist_dest[j]) && (dist_nbr[i] < dist_nbr[j]) )
{
temp_dist=dist_dest[j];
dist_dest[j]=dist_dest[i];
dist_dest[i]=temp_dist;
temp_dist=dist_nbr[j];
dist_nbr[j]=dist_nbr[i];
dist_nbr[i]=temp_dist;
temp_face=faces[j];
faces[j]=faces[i];
faces[i]=temp_face;
}
}
}
}
void
print_map(void)
{
int i, map_element;
struct map_entry *me;
struct hashtb_enumerator ee;
struct hashtb_enumerator *e = ⅇ
hashtb_start(nlsr->map, e);
map_element=hashtb_n(nlsr->map);
for(i=0;i<map_element;i++)
{
me=e->data;
if ( nlsr->debugging )
printf("Router: %s Mapping Number: %d \n",me->router,me->mapping);
if ( nlsr->detailed_logging )
writeLogg(__FILE__,__FUNCTION__,__LINE__,"Router: %s Mapping Number: %d \n",me->router,me->mapping);
hashtb_next(e);
}
hashtb_end(e);
}
void
assign_mapping_number(void)
{
int i, map_element;
struct map_entry *me;
struct hashtb_enumerator ee;
struct hashtb_enumerator *e = ⅇ
hashtb_start(nlsr->map, e);
map_element=hashtb_n(nlsr->map);
for(i=0;i<map_element;i++)
{
me=e->data;
me->mapping=i;
add_rev_map_entry(i,me->router);
hashtb_next(e);
}
hashtb_end(e);
}
void
make_map(void)
{
int i, adj_lsdb_element;
struct alsa *adj_lsa;
struct hashtb_enumerator ee;
struct hashtb_enumerator *e = ⅇ
hashtb_start(nlsr->lsdb->adj_lsdb, e);
adj_lsdb_element=hashtb_n(nlsr->lsdb->adj_lsdb);
add_map_entry(nlsr->router_name);
for(i=0;i<adj_lsdb_element;i++)
{
adj_lsa=e->data;
add_adj_data_to_map(adj_lsa->header->orig_router->name,adj_lsa->body,adj_lsa->no_link);
hashtb_next(e);
}
hashtb_end(e);
}
void
add_map_entry(char *router)
{
struct map_entry *me;//=(struct map_entry*)malloc(sizeof(struct map_entry ));
struct hashtb_enumerator ee;
struct hashtb_enumerator *e = ⅇ
int res;
hashtb_start(nlsr->map, e);
res = hashtb_seek(e, router, strlen(router), 0);
if(res == HT_NEW_ENTRY)
{
me=e->data;
me->router=(char *)malloc(strlen(router)+1);
memset(me->router,0,strlen(router)+1);
memcpy(me->router,router,strlen(router));
me->mapping=0;
}
hashtb_end(e);
}
void
add_adj_data_to_map(char *orig_router, char *body, int no_link)
{
add_map_entry(orig_router);
int i=0;
char *lsa_data=(char *)malloc(strlen(body)+1);
memset( lsa_data,0,strlen(body)+1);
memcpy(lsa_data,body,strlen(body)+1);
char *sep="|";
char *rem;
char *rtr_id;
char *length;
//char *face;
char *metric;
if(no_link >0 )
{
rtr_id=strtok_r(lsa_data,sep,&rem);
length=strtok_r(NULL,sep,&rem);
//face=strtok_r(NULL,sep,&rem);
metric=strtok_r(NULL,sep,&rem);
if ( !nlsr->debugging && nlsr->debugging)
{
printf("Metric: %s Length:%s\n",metric,length);
}
add_map_entry(rtr_id);
for(i=1;i<no_link;i++)
{
rtr_id=strtok_r(NULL,sep,&rem);
length=strtok_r(NULL,sep,&rem);
//face=strtok_r(NULL,sep,&rem);
metric=strtok_r(NULL,sep,&rem);
if ( !nlsr->debugging && nlsr->debugging)
{
printf("Metric: %s Length:%s\n",metric,length);
}
add_map_entry(rtr_id);
}
}
free(lsa_data);
}
int
get_mapping_no(char *router)
{
struct map_entry *me;
struct hashtb_enumerator ee;
struct hashtb_enumerator *e = ⅇ
int res;
int ret;
int n = hashtb_n(nlsr->map);
if ( n < 1)
{
return NO_MAPPING_NUM;
}
hashtb_start(nlsr->map, e);
res = hashtb_seek(e, router, strlen(router), 0);
if( res == HT_OLD_ENTRY )
{
me=e->data;
ret=me->mapping;
}
else if(res == HT_NEW_ENTRY)
{
hashtb_delete(e);
ret=NO_MAPPING_NUM;
}
hashtb_end(e);
return ret;
}
void
add_rev_map_entry(long int mapping_number, char *router)
{
struct map_entry *me;//=(struct map_entry*)malloc(sizeof(struct map_entry ));
struct hashtb_enumerator ee;
struct hashtb_enumerator *e = ⅇ
int res;
hashtb_start(nlsr->rev_map, e);
res = hashtb_seek(e, &mapping_number, sizeof(mapping_number), 0);
if(res == HT_NEW_ENTRY)
{
me=e->data;
me->router=(char *)malloc(strlen(router)+1);
memset(me->router,0,strlen(router)+1);
memcpy(me->router,router,strlen(router));
me->mapping=mapping_number;
}
hashtb_end(e);
}
char *
get_router_from_rev_map(long int mapping_number)
{
struct map_entry *me;
struct hashtb_enumerator ee;
struct hashtb_enumerator *e = ⅇ
int res;
hashtb_start(nlsr->rev_map, e);
res = hashtb_seek(e, &mapping_number, sizeof(mapping_number), 0);
if(res == HT_OLD_ENTRY)
{
me=e->data;
hashtb_end(e);
return me->router;
}
else if(res == HT_NEW_ENTRY)
{
hashtb_delete(e);
hashtb_end(e);
}
return NULL;
}
void
print_rev_map(void)
{
int i, map_element;
struct map_entry *me;
struct hashtb_enumerator ee;
struct hashtb_enumerator *e = ⅇ
hashtb_start(nlsr->map, e);
map_element=hashtb_n(nlsr->map);
for(i=0;i<map_element;i++)
{
me=e->data;
if ( nlsr->debugging )
printf("Mapping Number: %d Router: %s \n",me->mapping,me->router);
if ( nlsr->detailed_logging )
writeLogg(__FILE__,__FUNCTION__,__LINE__,"Mapping Number: %d Router: %s \n",me->mapping,me->router);
hashtb_next(e);
}
hashtb_end(e);
}
void
assign_adj_matrix_for_lsa(struct alsa *adj_lsa, int **adj_matrix)
{
int mapping_orig_router=get_mapping_no(adj_lsa->header->orig_router->name);
int mapping_nbr_router;
int i;
char *lsa_data=(char *)malloc(strlen(adj_lsa->body)+1);
memset( lsa_data,0,strlen(adj_lsa->body)+1);
memcpy(lsa_data,adj_lsa->body,strlen(adj_lsa->body)+1);
char *sep="|";
char *rem;
char *rtr_id;
char *length;
//char *face;
char *metric;
if(adj_lsa->no_link >0 )
{
rtr_id=strtok_r(lsa_data,sep,&rem);
length=strtok_r(NULL,sep,&rem);
//face=strtok_r(NULL,sep,&rem);
metric=strtok_r(NULL,sep,&rem);
if ( !nlsr->debugging && nlsr->debugging)
{
printf("Metric: %s Length:%s\n",metric,length);
}
mapping_nbr_router=get_mapping_no(rtr_id);
adj_matrix[mapping_orig_router][mapping_nbr_router]=atoi(metric);
for(i=1;i<adj_lsa->no_link;i++)
{
rtr_id=strtok_r(NULL,sep,&rem);
length=strtok_r(NULL,sep,&rem);
//face=strtok_r(NULL,sep,&rem);
metric=strtok_r(NULL,sep,&rem);
if ( !nlsr->debugging && nlsr->debugging)
{
printf("Metric: %s Length:%s\n",metric,length);
}
mapping_nbr_router=get_mapping_no(rtr_id);
adj_matrix[mapping_orig_router][mapping_nbr_router]=atoi(metric);
}
}
free(lsa_data);
}
void
make_adj_matrix(int **adj_matrix,int map_element)
{
init_adj_matrix(adj_matrix,map_element);
int i, adj_lsdb_element;
struct alsa *adj_lsa;
struct hashtb_enumerator ee;
struct hashtb_enumerator *e = ⅇ
hashtb_start(nlsr->lsdb->adj_lsdb, e);
adj_lsdb_element=hashtb_n(nlsr->lsdb->adj_lsdb);
for(i=0;i<adj_lsdb_element;i++)
{
adj_lsa=e->data;
assign_adj_matrix_for_lsa(adj_lsa,adj_matrix);
hashtb_next(e);
}
hashtb_end(e);
}
void
init_adj_matrix(int **adj_matrix,int map_element)
{
int i, j;
for(i=0;i<map_element;i++)
for(j=0;j<map_element;j++)
adj_matrix[i][j]=0;
}
void print_adj_matrix(int **adj_matrix, int map_element)
{
int i, j;
for(i=0;i<map_element;i++)
{
for(j=0;j<map_element;j++)
printf("%d ",adj_matrix[i][j]);
printf("\n");
}
}
int
get_no_link_from_adj_matrix(int **adj_matrix,long int V, long int S)
{
int no_link=0;
int i;
for(i=0;i<V;i++)
{
if ( adj_matrix[S][i] > 0 )
{
no_link++;
}
}
return no_link;
}
void
get_links_from_adj_matrix(int **adj_matrix, long int V ,long int *links, long int *link_costs,long int S)
{
int i,j;
j=0;
for (i=0; i <V; i++)
{
if ( adj_matrix[S][i] > 0 )
{
links[j]=i;
link_costs[j]=adj_matrix[S][i];
j++;
}
}
}
void adjust_adj_matrix(int **adj_matrix, long int V, long int S, long int link,long int link_cost)
{
int i;
for ( i = 0; i < V; i++ )
{
if ( i == link )
{
adj_matrix[S][i]=link_cost;
}
else
{
adj_matrix[S][i]=0;
}
}
}
int
get_number_of_next_hop(char *dest_router)
{
struct routing_table_entry *rte;
struct hashtb_enumerator ee;
struct hashtb_enumerator *e = ⅇ
int res,ret;
hashtb_start(nlsr->routing_table, e);
res = hashtb_seek(e, dest_router, strlen(dest_router), 0);
if( res == HT_OLD_ENTRY )
{
rte=e->data;
ret=hashtb_n(rte->face_list);
//nhl=rte->face_list;
}
else if(res == HT_NEW_ENTRY)
{
hashtb_delete(e);
ret=NO_NEXT_HOP;
}
hashtb_end(e);
return ret;
}
int
get_next_hop(char *dest_router,int *faces, int *route_costs)
{
struct routing_table_entry *rte;
struct hashtb_enumerator ee;
struct hashtb_enumerator *e = ⅇ
int res,ret;
hashtb_start(nlsr->routing_table, e);
res = hashtb_seek(e, dest_router, strlen(dest_router), 0);
if( res == HT_OLD_ENTRY )
{
rte=e->data;
ret=hashtb_n(rte->face_list);
//nhl=rte->face_list;
int j,face_list_element;
struct face_list_entry *fle;
struct hashtb_enumerator eef;
struct hashtb_enumerator *ef = &eef;
hashtb_start(rte->face_list, ef);
face_list_element=hashtb_n(rte->face_list);
for(j=0;j<face_list_element;j++)
{
fle=ef->data;
//printf(" Face: %d Route_Cost: %d \n",fle->next_hop_face,fle->route_cost);
faces[j]=fle->next_hop_face;
route_costs[j]=fle->route_cost;
hashtb_next(ef);
}
hashtb_end(ef);
}
else if(res == HT_NEW_ENTRY)
{
hashtb_delete(e);
ret=NO_NEXT_HOP;
}
hashtb_end(e);
return ret;
}
void
add_next_hop_router(char *dest_router)
{
if ( strcmp(dest_router,nlsr->router_name)== 0)
{
return ;
}
struct routing_table_entry *rte;//=(struct routing_table_entry *)malloc(sizeof(struct routing_table_entry));
struct hashtb_enumerator ee;
struct hashtb_enumerator *e = ⅇ
int res;
hashtb_start(nlsr->routing_table, e);
res = hashtb_seek(e, dest_router, strlen(dest_router), 0);
if( res == HT_NEW_ENTRY )
{
rte=e->data;
rte->dest_router=(char *)malloc(strlen(dest_router)+1);
memset(rte->dest_router,0,strlen(dest_router)+1);
memcpy(rte->dest_router,dest_router,strlen(dest_router));
//rte->next_hop_face=NO_NEXT_HOP;
struct hashtb_param param_fle = {0};
rte->face_list=hashtb_create(sizeof(struct face_list_entry), ¶m_fle);
add_npt_entry(dest_router, dest_router, 0, NULL, NULL);
}
hashtb_end(e);
}
void
add_next_hop_from_lsa_adj_body(char *body, int no_link)
{
int i=0;
char *lsa_data=(char *)malloc(strlen(body)+1);
memset( lsa_data,0,strlen(body)+1);
memcpy(lsa_data,body,strlen(body)+1);
char *sep="|";
char *rem;
char *rtr_id;
char *length;
//char *face;
char *metric;
if(no_link >0 )
{
rtr_id=strtok_r(lsa_data,sep,&rem);
length=strtok_r(NULL,sep,&rem);
//face=strtok_r(NULL,sep,&rem);
metric=strtok_r(NULL,sep,&rem);
if ( !nlsr->debugging && nlsr->debugging)
{
printf("Metric: %s Length:%s\n",metric,length);
}
add_next_hop_router(rtr_id);