static void
test_packet_type_ipv4_tcp() {
buffer *buf = alloc_buffer_with_length( sizeof( struct iphdr ) );
calloc_packet_info( buf );
assert_false( packet_type_ipv4_tcp( buf ) );
packet_info *packet_info = buf->user_data;
packet_info->format |= TP_TCP;
assert_false( packet_type_ipv4_tcp( buf ) );
packet_info->format |= NW_IPV4;
assert_true( packet_type_ipv4_tcp( buf ) );
free_buffer( buf );
}
static bool
packet_to_set_reverse_path( const buffer *packet ) {
packet_info *pinfo = ( packet_info * ) packet->user_data;
if ( is_ether_multicast( pinfo->eth_macsa ) || is_ether_multicast( pinfo->eth_macda ) ) {
return false;
}
if ( packet_type_ipv4_tcp( packet ) || packet_type_ipv4_udp( packet ) || packet_type_icmpv4_echo_request( packet ) ) {
return true;
}
return false;
}
static void
handle_packet_in( uint64_t datapath_id, uint32_t transaction_id,
uint32_t buffer_id, uint16_t total_len,
uint16_t in_port, uint8_t reason, const buffer *data,
void *user_data ) {
assert( in_port != 0 );
assert( data != NULL );
assert( user_data != NULL );
routing_switch *routing_switch = user_data;
debug( "Packet-In received ( datapath_id = %#" PRIx64 ", transaction_id = %#lx, "
"buffer_id = %#lx, total_len = %u, in_port = %u, reason = %#x, "
"data_len = %u ).", datapath_id, transaction_id, buffer_id,
total_len, in_port, reason, data->length );
const port_info *port = lookup_port( routing_switch->switches, datapath_id, in_port );
if ( port == NULL ) {
debug( "Ignoring Packet-In from unknown port." );
return;
}
packet_info packet_info = get_packet_info( data );
const uint8_t *src = packet_info.eth_macsa;
const uint8_t *dst = packet_info.eth_macda;
if ( in_port > OFPP_MAX && in_port != OFPP_LOCAL ) {
error( "Packet-In from invalid port ( in_port = %u ).", in_port );
return;
}
if ( !port->external_link || port->switch_to_switch_reverse_link ) {
if ( !port->external_link
&& port->switch_to_switch_link
&& port->switch_to_switch_reverse_link
&& !is_ether_multicast( dst )
&& lookup_fdb( routing_switch->fdb, src, &datapath_id, &in_port ) ) {
debug( "Found a Packet-In from switch-to-switch link." );
}
else {
debug( "Ignoring Packet-In from not external link." );
return;
}
}
if ( !update_fdb( routing_switch->fdb, src, datapath_id, in_port ) ) {
return;
}
if ( !authenticate( src ) ) {
if ( packet_type_ipv4( data ) ) {
if ( packet_type_ipv4_udp( data ) ) {
if ( ( packet_info.udp_src_port == 67 ) ||
( packet_info.udp_src_port == 68 ) ||
( packet_info.udp_dst_port == 67 ) ||
( packet_info.udp_dst_port == 68 ) ) {
// DHCP/BOOTP is allowed by default
goto authenticated;
}
if ( ( packet_info.udp_src_port == 53 ) ||
( packet_info.udp_dst_port == 53 ) ) {
// DNS is allowed by default
goto authenticated;
}
}
else if ( packet_type_ipv4_tcp( data ) ) {
if ( ( packet_info.tcp_src_port == 53 ) ||
( packet_info.tcp_dst_port == 53 ) ) {
// DNS is allowed by default
goto authenticated;
}
}
redirect( datapath_id, in_port, data );
}
else if ( packet_type_arp( data ) ) {
// ARP request/reply is allowed
goto authenticated;
}
return;
}
authenticated:
{
uint16_t out_port;
uint64_t out_datapath_id;
if ( lookup_fdb( routing_switch->fdb, dst, &out_datapath_id, &out_port ) ) {
// Host is located, so resolve path and send flowmod
if ( ( datapath_id == out_datapath_id ) && ( in_port == out_port ) ) {
// in and out are same
return;
}
make_path( routing_switch, datapath_id, in_port, out_datapath_id, out_port, data );
}
else {
// Host's location is unknown, so flood packet
flood_packet( datapath_id, in_port, data, routing_switch->switches );
}
}
}
