static void
make_path( sliceable_switch *sliceable_switch, uint64_t in_datapath_id, uint16_t in_port, uint16_t in_vid,
uint64_t out_datapath_id, uint16_t out_port, uint16_t out_vid, const buffer *packet ) {
dlist_element *hops = resolve_path( sliceable_switch->pathresolver, in_datapath_id, in_port, out_datapath_id, out_port );
if ( hops == NULL ) {
warn( "No available path found ( %#" PRIx64 ":%u -> %#" PRIx64 ":%u ).",
in_datapath_id, in_port, out_datapath_id, out_port );
discard_packet_in( in_datapath_id, in_port, packet );
return;
}
// check if the packet is ARP or not
if ( sliceable_switch->handle_arp_with_packetout && packet_type_arp( packet ) ) {
// send packet out for tail switch
free_hop_list( hops );
output_packet( packet, out_datapath_id, out_port, out_vid );
return;
}
const uint32_t wildcards = 0;
struct ofp_match match;
set_match_from_packet( &match, in_port, wildcards, packet );
if ( lookup_path( in_datapath_id, match, PRIORITY ) != NULL ) {
warn( "Duplicated path found." );
output_packet( packet, out_datapath_id, out_port, out_vid );
return;
}
const uint16_t hard_timeout = 0;
path *p = create_path( match, PRIORITY, sliceable_switch->idle_timeout, hard_timeout );
assert( p != NULL );
for ( dlist_element *e = get_first_element( hops ); e != NULL; e = e->next ) {
pathresolver_hop *rh = e->data;
hop *h = create_hop( rh->dpid, rh->in_port_no, rh->out_port_no, NULL );
assert( h != NULL );
append_hop_to_path( p, h );
} // for(;;)
dlist_element *e = get_last_element( hops );
pathresolver_hop *last_hop = e->data;
packet_out_params *params = xmalloc( sizeof( struct packet_out_params ) );
params->packet = duplicate_buffer( packet );
params->out_datapath_id = last_hop->dpid;
params->out_port_no = last_hop->out_port_no;
params->out_vid = out_vid;
bool ret = setup_path( p, handle_setup, params, NULL, NULL );
if ( ret != true ) {
error( "Failed to set up path." );
output_packet( packet, out_datapath_id, out_port, out_vid );
free_buffer( params->packet );
xfree( params );
}
delete_path( p );
// free them
free_hop_list( hops );
}
static void
setup_reverse_path( int status, const path *p, void *user_data ) {
assert(user_data);
packet_out_params *params = user_data;
if ( status != SETUP_SUCCEEDED ) {
error( "Failed to set up path ( status = %d ).", status );
output_packet( params->packet, params->out_datapath_id, params->out_port_no, params->out_vid );
free_buffer( params->packet );
xfree( params );
return;
}
struct ofp_match rmatch;
set_ipv4_reverse_match( &rmatch, &(p->match) );
rmatch.dl_vlan = params->out_vid;
openflow_actions *vlan_actions;
vlan_actions = create_openflow_actions_to_update_vid( params->out_vid, params->in_vid );
path *rpath = create_path( rmatch, p->priority, p->idle_timeout, p->hard_timeout );
assert( rpath != NULL );
list_element *hops = p->hops;
dlist_element *rhops = create_dlist();
while ( hops != NULL ) {
hop *h = hops->data;
assert( h != NULL );
hop *rh = create_hop( h->datapath_id, h->out_port, h->in_port, vlan_actions );
if ( vlan_actions ) {
delete_actions( vlan_actions );
vlan_actions = NULL;
}
assert( rh != NULL );
rhops = insert_before_dlist( rhops, rh );
hops = hops->next;
}
while ( rhops != NULL && rhops->data != NULL ) {
append_hop_to_path( rpath, ( hop * ) rhops->data );
rhops = rhops->next;
}
bool ret = setup_path( rpath, handle_setup, params, NULL, NULL );
if ( ret != true ) {
error( "Failed to set up reverse path." );
output_packet( params->packet, params->out_datapath_id, params->out_port_no, params->out_vid );
free_buffer( params->packet );
xfree( params );
}
delete_path( rpath );
delete_dlist( rhops );
}
