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/*
* Copyright 2017-present Open Networking Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef __PARSER__
#define __PARSER__
#include "define.p4"
parser FabricParser (
packet_in packet,
out parsed_headers_t hdr,
inout fabric_metadata_t fabric_metadata,
inout standard_metadata_t standard_metadata) {
bit<6> last_ipv4_dscp = 0;
state start {
transition select(standard_metadata.ingress_port) {
CPU_PORT: parse_packet_out;
default: parse_ethernet;
}
}
state parse_packet_out {
packet.extract(hdr.packet_out);
transition parse_ethernet;
}
state parse_ethernet {
packet.extract(hdr.ethernet);
transition select(hdr.ethernet.ether_type){
ETHERTYPE_VLAN: parse_vlan_tag;
ETHERTYPE_MPLS: parse_mpls;
ETHERTYPE_ARP: parse_arp;
ETHERTYPE_IPV4: parse_ipv4;
#ifdef WITH_IPV6
ETHERTYPE_IPV6: parse_ipv6;
#endif // WITH_IPV6
default: accept;
}
}
state parse_vlan_tag {
packet.extract(hdr.vlan_tag);
transition select(hdr.vlan_tag.ether_type){
ETHERTYPE_ARP: parse_arp;
ETHERTYPE_IPV4: parse_ipv4;
#ifdef WITH_IPV6
ETHERTYPE_IPV6: parse_ipv6;
#endif // WITH_IPV6
ETHERTYPE_MPLS: parse_mpls;
default: accept;
}
}
state parse_mpls {
packet.extract(hdr.mpls);
// There is only one MPLS label for this fabric.
// Assume header after MPLS header is IP/IPv6
// Lookup first 4 bits for version
transition select(packet.lookahead<bit<IP_VER_LENGTH>>()) {
//The packet should be either IPv4 or IPv6.
IP_VERSION_4: parse_ipv4;
#ifdef WITH_IPV6
IP_VERSION_6: parse_ipv6;
#endif // WITH_IPV6
default: parse_ethernet;
}
}
state parse_ipv4 {
packet.extract(hdr.ipv4);
fabric_metadata.ip_proto = hdr.ipv4.protocol;
last_ipv4_dscp = hdr.ipv4.dscp;
//Need header verification?
transition select(hdr.ipv4.protocol) {
PROTO_TCP: parse_tcp;
PROTO_UDP: parse_udp;
PROTO_ICMP: parse_icmp;
default: accept;
}
}
#ifdef WITH_IPV6
state parse_ipv6 {
packet.extract(hdr.ipv6);
fabric_metadata.ip_proto = hdr.ipv6.next_hdr;
transition select(hdr.ipv6.next_hdr) {
PROTO_TCP: parse_tcp;
PROTO_UDP: parse_udp;
PROTO_ICMPV6: parse_icmp;
default: accept;
}
}
#endif // WITH_IPV6
state parse_arp {
packet.extract(hdr.arp);
transition accept;
}
state parse_tcp {
packet.extract(hdr.tcp);
fabric_metadata.l4_src_port = hdr.tcp.src_port;
fabric_metadata.l4_dst_port = hdr.tcp.dst_port;
#ifdef WITH_INT
transition parse_int;
#else
transition accept;
#endif // WITH_INT
}
state parse_udp {
packet.extract(hdr.udp);
fabric_metadata.l4_src_port = hdr.udp.src_port;
fabric_metadata.l4_dst_port = hdr.udp.dst_port;
transition select(hdr.udp.dst_port) {
#ifdef WITH_SPGW
UDP_PORT_GTPU: parse_gtpu;
#endif // WITH_SPGW
#ifdef WITH_INT
default: parse_int;
#else
default: accept;
#endif // WITH_INT
}
}
state parse_icmp {
packet.extract(hdr.icmp);
transition accept;
}
#ifdef WITH_SPGW
state parse_gtpu {
transition select(hdr.ipv4.dst_addr[31:32-S1U_SGW_PREFIX_LEN]) {
// Avoid parsing GTP and inner headers if we know this GTP packet
// is not to be processed by this switch.
// FIXME: use parser value sets when support is ready in ONOS.
// To set the S1U_SGW_PREFIX value at runtime.
S1U_SGW_PREFIX[31:32-S1U_SGW_PREFIX_LEN]: do_parse_gtpu;
default: accept;
}
}
state do_parse_gtpu {
packet.extract(hdr.gtpu);
transition parse_inner_ipv4;
}
state parse_inner_ipv4 {
packet.extract(hdr.inner_ipv4);
last_ipv4_dscp = hdr.inner_ipv4.dscp;
transition select(hdr.inner_ipv4.protocol) {
PROTO_TCP: parse_tcp;
PROTO_UDP: parse_inner_udp;
PROTO_ICMP: parse_icmp;
default: accept;
}
}
state parse_inner_udp {
packet.extract(hdr.inner_udp);
fabric_metadata.l4_src_port = hdr.inner_udp.src_port;
fabric_metadata.l4_dst_port = hdr.inner_udp.dst_port;
#ifdef WITH_INT
transition parse_int;
#else
transition accept;
#endif // WITH_INT
}
#endif // WITH_SPGW
#ifdef WITH_INT
state parse_int {
transition select(last_ipv4_dscp) {
INT_DSCP &&& INT_DSCP: parse_intl4_shim;
default: accept;
}
}
state parse_intl4_shim {
packet.extract(hdr.intl4_shim);
transition parse_int_header;
}
state parse_int_header {
packet.extract(hdr.int_header);
// If there is no INT metadata but the INT header (plus shim and tail)
// exists, default value of length field in shim header should be
// INT_HEADER_LEN_WORDS.
transition select (hdr.intl4_shim.len_words) {
INT_HEADER_LEN_WORDS: parse_intl4_tail;
default: parse_int_data;
}
}
state parse_int_data {
#ifdef WITH_INT_SINK
// Parse INT metadata stack, but not tail
packet.extract(hdr.int_data, (bit<32>) (hdr.intl4_shim.len_words - INT_HEADER_LEN_WORDS) << 5);
transition parse_intl4_tail;
#else // not interested in INT data
transition accept;
#endif // WITH_INT_SINK
}
state parse_intl4_tail {
packet.extract(hdr.intl4_tail);
transition accept;
}
#endif // WITH_INT
}
control FabricDeparser(packet_out packet, in parsed_headers_t hdr) {
apply {
packet.emit(hdr.packet_in);
#ifdef WITH_INT_SINK
packet.emit(hdr.report_ethernet);
packet.emit(hdr.report_ipv4);
packet.emit(hdr.report_udp);
packet.emit(hdr.report_fixed_header);
#endif // WITH_INT_SINK
packet.emit(hdr.ethernet);
packet.emit(hdr.vlan_tag);
packet.emit(hdr.mpls);
packet.emit(hdr.arp);
#ifdef WITH_SPGW
packet.emit(hdr.gtpu_ipv4);
packet.emit(hdr.gtpu_udp);
packet.emit(hdr.gtpu);
#endif // WITH_SPGW
packet.emit(hdr.ipv4);
#ifdef WITH_IPV6
packet.emit(hdr.ipv6);
#endif // WITH_IPV6
packet.emit(hdr.tcp);
packet.emit(hdr.udp);
packet.emit(hdr.icmp);
#ifdef WITH_INT
packet.emit(hdr.intl4_shim);
packet.emit(hdr.int_header);
#ifdef WITH_INT_TRANSIT
packet.emit(hdr.int_switch_id);
packet.emit(hdr.int_port_ids);
packet.emit(hdr.int_hop_latency);
packet.emit(hdr.int_q_occupancy);
packet.emit(hdr.int_ingress_tstamp);
packet.emit(hdr.int_egress_tstamp);
packet.emit(hdr.int_q_congestion);
packet.emit(hdr.int_egress_tx_util);
#endif // WITH_INT_TRANSIT
#ifdef WITH_INT_SINK
packet.emit(hdr.int_data);
#endif // WITH_INT_SINK
packet.emit(hdr.intl4_tail);
#endif // WITH_INT
}
}
#endif