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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 __SPGW__
#define __SPGW__
#define DEFAULT_PDR_CTR_ID 0
#define DEFAULT_FAR_ID 0
#ifndef MAX_UES
#define MAX_UES 1024
#endif // MAX_UES
#define MAX_INTERFACES 128
#define MAX_UPLINK_PDRS MAX_UES
#define MAX_DOWNLINK_PDRS MAX_UES
#define MAX_PDR_COUNTERS 2 * MAX_UES
#define MAX_FARS 2 * MAX_UES
control DecapGtpu(inout parsed_headers_t hdr,
inout fabric_metadata_t fabric_md) {
@hidden
action decap_inner_common() {
// Correct parser-set metadata to use the inner header values
fabric_md.ip_eth_type = ETHERTYPE_IPV4;
fabric_md.ip_proto = hdr.inner_ipv4.protocol;
fabric_md.ipv4_src_addr = hdr.inner_ipv4.src_addr;
fabric_md.ipv4_dst_addr = hdr.inner_ipv4.dst_addr;
fabric_md.l4_sport = fabric_md.inner_l4_sport;
fabric_md.l4_dport = fabric_md.inner_l4_dport;
// Move GTPU and inner L3 headers out
hdr.ipv4 = hdr.inner_ipv4;
hdr.inner_ipv4.setInvalid();
hdr.gtpu.setInvalid();
}
@hidden
action decap_inner_tcp() {
decap_inner_common();
hdr.udp.setInvalid();
hdr.tcp = hdr.inner_tcp;
hdr.inner_tcp.setInvalid();
}
@hidden
action decap_inner_udp() {
decap_inner_common();
hdr.udp = hdr.inner_udp;
hdr.inner_udp.setInvalid();
}
@hidden
action decap_inner_icmp() {
decap_inner_common();
hdr.udp.setInvalid();
hdr.icmp = hdr.inner_icmp;
hdr.inner_icmp.setInvalid();
}
@hidden
action decap_inner_unknown() {
decap_inner_common();
hdr.udp.setInvalid();
}
@hidden
table decap_gtpu {
key = {
hdr.inner_tcp.isValid() : exact;
hdr.inner_udp.isValid() : exact;
hdr.inner_icmp.isValid() : exact;
}
actions = {
decap_inner_tcp;
decap_inner_udp;
decap_inner_icmp;
decap_inner_unknown;
}
const default_action = decap_inner_unknown;
const entries = {
(true, false, false) : decap_inner_tcp();
(false, true, false) : decap_inner_udp();
(false, false, true) : decap_inner_icmp();
}
size = 4;
}
apply {
decap_gtpu.apply();
}
}
control SpgwIngress(inout parsed_headers_t hdr,
inout fabric_metadata_t fabric_md,
inout standard_metadata_t standard_metadata) {
//=============================//
//===== Misc Things ======//
//=============================//
counter(MAX_PDR_COUNTERS, CounterType.packets_and_bytes) pdr_counter;
DecapGtpu() decap_gtpu_from_dbuf;
DecapGtpu() decap_gtpu;
//=============================//
//===== Interface Tables ======//
//=============================//
action load_iface(spgw_interface_t src_iface) {
// Interface type can be access, core, from_dbuf (see InterfaceType enum)
fabric_md.spgw.src_iface = src_iface;
fabric_md.spgw.skip_spgw = _FALSE;
}
action iface_miss() {
fabric_md.spgw.src_iface = SPGW_IFACE_UNKNOWN;
fabric_md.spgw.skip_spgw = _TRUE;
}
// TODO: check also that gtpu.msgtype == GTP_GPDU... somewhere
table interfaces {
key = {
hdr.ipv4.dst_addr : lpm @name("ipv4_dst_addr"); // outermost header
hdr.gtpu.isValid() : exact @name("gtpu_is_valid");
}
actions = {
load_iface;
@defaultonly iface_miss;
}
const default_action = iface_miss();
size = MAX_INTERFACES;
}
//=============================//
//===== PDR Tables ======//
//=============================//
action load_pdr(pdr_ctr_id_t ctr_id,
far_id_t far_id,
bit<1> needs_gtpu_decap) {
fabric_md.spgw.ctr_id = ctr_id;
fabric_md.spgw.far_id = far_id;
fabric_md.spgw.needs_gtpu_decap = (_BOOL)needs_gtpu_decap;
}
action load_pdr_qos(pdr_ctr_id_t ctr_id,
far_id_t far_id,
bit<1> needs_gtpu_decap,
qid_t qid) {
load_pdr(ctr_id, far_id, needs_gtpu_decap);
// we cannot set the qid, since bmv2 does not support it
}
// These two tables scale well and cover the average case PDR
table downlink_pdrs {
key = {
// only available ipv4 header
hdr.ipv4.dst_addr : exact @name("ue_addr");
}
actions = {
load_pdr;
load_pdr_qos;
}
size = MAX_DOWNLINK_PDRS;
}
table uplink_pdrs {
key = {
hdr.ipv4.dst_addr : exact @name("tunnel_ipv4_dst");
hdr.gtpu.teid : exact @name("teid");
}
actions = {
load_pdr;
load_pdr_qos;
}
size = MAX_UPLINK_PDRS;
}
//=============================//
//===== FAR Tables ======//
//=============================//
action load_normal_far(bit<1> drop,
bit<1> notify_cp) {
// general far attributes
fabric_md.skip_forwarding = (_BOOL)drop;
fabric_md.skip_next = (_BOOL)drop;
fabric_md.spgw.notify_spgwc = (_BOOL)notify_cp;
}
action load_tunnel_far(bit<1> drop,
bit<1> notify_cp,
bit<16> tunnel_src_port,
bit<32> tunnel_src_addr,
bit<32> tunnel_dst_addr,
teid_t teid) {
// general far attributes
fabric_md.skip_forwarding = (_BOOL)drop;
fabric_md.skip_next = (_BOOL)drop;
fabric_md.spgw.notify_spgwc = (_BOOL)notify_cp;
// GTP tunnel attributes
fabric_md.spgw.needs_gtpu_encap = _TRUE;
fabric_md.spgw.teid = teid;
fabric_md.spgw.tunnel_src_port = tunnel_src_port;
fabric_md.spgw.tunnel_src_addr = tunnel_src_addr;
fabric_md.spgw.tunnel_dst_addr = tunnel_dst_addr;
// update metadata for correct routing/hashing
fabric_md.ipv4_src_addr = tunnel_src_addr;
fabric_md.ipv4_dst_addr = tunnel_dst_addr;
fabric_md.l4_sport = tunnel_src_port;
fabric_md.l4_dport = UDP_PORT_GTPU;
}
action load_dbuf_far(bit<1> drop,
bit<1> notify_cp,
bit<16> tunnel_src_port,
bit<32> tunnel_src_addr,
bit<32> tunnel_dst_addr,
teid_t teid) {
load_tunnel_far(drop, notify_cp, tunnel_src_port,
tunnel_src_addr, tunnel_dst_addr, teid);
fabric_md.spgw.skip_egress_pdr_ctr = _TRUE;
}
table fars {
key = {
fabric_md.spgw.far_id : exact @name("far_id");
}
actions = {
load_normal_far;
load_tunnel_far;
load_dbuf_far;
}
// default is drop and don't notify CP
const default_action = load_normal_far(1, 0);
size = MAX_FARS;
}
//=============================//
//===== Apply Block ======//
//=============================//
apply {
// Interfaces
if (interfaces.apply().hit) {
if (fabric_md.spgw.src_iface == SPGW_IFACE_FROM_DBUF) {
decap_gtpu_from_dbuf.apply(hdr, fabric_md);
}
// PDRs
if (hdr.gtpu.isValid()) {
uplink_pdrs.apply();
} else {
downlink_pdrs.apply();
}
if (fabric_md.spgw.src_iface != SPGW_IFACE_FROM_DBUF) {
pdr_counter.count(fabric_md.spgw.ctr_id);
}
// GTPU Decapsulate
if (fabric_md.spgw.needs_gtpu_decap == _TRUE) {
decap_gtpu.apply(hdr, fabric_md);
}
// FARs
// Load FAR info
fars.apply();
// Nothing to be done immediately for forwarding or encapsulation.
// Forwarding is done by other parts of fabric.p4, and
// encapsulation is done in the egress
// Needed for correct GTPU encapsulation in egress
fabric_md.spgw.ipv4_len = hdr.ipv4.total_len;
}
}
}
//====================================//
//============== Egress ==============//
//====================================//
control SpgwEgress(
inout parsed_headers_t hdr,
inout fabric_metadata_t fabric_md) {
counter(MAX_PDR_COUNTERS, CounterType.packets_and_bytes) pdr_counter;
@hidden
action gtpu_encap() {
hdr.gtpu_ipv4.setValid();
hdr.gtpu_ipv4.version = IP_VERSION_4;
hdr.gtpu_ipv4.ihl = IPV4_MIN_IHL;
hdr.gtpu_ipv4.dscp = 0;
hdr.gtpu_ipv4.ecn = 0;
hdr.gtpu_ipv4.total_len = hdr.ipv4.total_len
+ (IPV4_HDR_SIZE + UDP_HDR_SIZE + GTP_HDR_SIZE);
hdr.gtpu_ipv4.identification = 0x1513; /* From NGIC. TODO: Needs to be dynamic */
hdr.gtpu_ipv4.flags = 0;
hdr.gtpu_ipv4.frag_offset = 0;
hdr.gtpu_ipv4.ttl = DEFAULT_IPV4_TTL;
hdr.gtpu_ipv4.protocol = PROTO_UDP;
hdr.gtpu_ipv4.src_addr = fabric_md.spgw.tunnel_src_addr;
hdr.gtpu_ipv4.dst_addr = fabric_md.spgw.tunnel_dst_addr;
hdr.gtpu_ipv4.hdr_checksum = 0; // Updated later
hdr.gtpu_udp.setValid();
hdr.gtpu_udp.sport = fabric_md.spgw.tunnel_src_port;
hdr.gtpu_udp.dport = UDP_PORT_GTPU;
hdr.gtpu_udp.len = fabric_md.spgw.ipv4_len
+ (UDP_HDR_SIZE + GTP_HDR_SIZE);
hdr.gtpu_udp.checksum = 0; // Updated later, if WITH_SPGW_UDP_CSUM_UPDATE
hdr.outer_gtpu.setValid();
hdr.outer_gtpu.version = GTPU_VERSION;
hdr.outer_gtpu.pt = GTP_PROTOCOL_TYPE_GTP;
hdr.outer_gtpu.spare = 0;
hdr.outer_gtpu.ex_flag = 0;
hdr.outer_gtpu.seq_flag = 0;
hdr.outer_gtpu.npdu_flag = 0;
hdr.outer_gtpu.msgtype = GTP_GPDU;
hdr.outer_gtpu.msglen = fabric_md.spgw.ipv4_len;
hdr.outer_gtpu.teid = fabric_md.spgw.teid;
}
apply {
if (fabric_md.spgw.skip_spgw == _FALSE) {
if (fabric_md.spgw.needs_gtpu_encap == _TRUE) {
gtpu_encap();
}
if (fabric_md.spgw.skip_egress_pdr_ctr == _FALSE) {
pdr_counter.count(fabric_md.spgw.ctr_id);
}
}
}
}
control update_gtpu_checksum(
inout ipv4_t gtpu_ipv4,
inout udp_t gtpu_udp,
in gtpu_t gtpu,
in ipv4_t ipv4,
in udp_t udp
) {
apply {
// Compute outer IPv4 checksum.
update_checksum(gtpu_ipv4.isValid(),
{
gtpu_ipv4.version,
gtpu_ipv4.ihl,
gtpu_ipv4.dscp,
gtpu_ipv4.ecn,
gtpu_ipv4.total_len,
gtpu_ipv4.identification,
gtpu_ipv4.flags,
gtpu_ipv4.frag_offset,
gtpu_ipv4.ttl,
gtpu_ipv4.protocol,
gtpu_ipv4.src_addr,
gtpu_ipv4.dst_addr
},
gtpu_ipv4.hdr_checksum,
HashAlgorithm.csum16
);
#ifdef WITH_SPGW_UDP_CSUM_UPDATE
// Compute outer UDP checksum.
update_checksum_with_payload(gtpu_udp.isValid(),
{
gtpu_ipv4.src_addr,
gtpu_ipv4.dst_addr,
8w0,
gtpu_ipv4.protocol,
gtpu_udp.len,
gtpu_udp.sport,
gtpu_udp.dport,
gtpu_udp.len,
gtpu,
ipv4,
// FIXME: we are assuming only UDP for downlink packets
// How to conditionally switch between UDP/TCP/ICMP?
udp
},
gtpu_udp.checksum,
HashAlgorithm.csum16
);
#endif // WITH_SPGW_UDP_CSUM_UPDATE
}
}
#endif