541 lines
No EOL
16 KiB
Text
541 lines
No EOL
16 KiB
Text
/* -*- P4_16 -*- */
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#include <core.p4>
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#include <v1model.p4>
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#include "headers.p4"
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#include "parsers.p4"
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#include "checksums.p4"
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#include "settings.p4"
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/*************************************************************************
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************** I N G R E S S P R O C E S S I N G *******************
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*************************************************************************/
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control MyIngress(inout headers hdr,
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inout metadata meta,
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inout standard_metadata_t standard_metadata) {
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/********************** GENERAL ACTIONS ***********************************/
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action drop() {
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mark_to_drop();
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}
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action set_egress_port (port_t out_port) {
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standard_metadata.egress_spec = out_port;
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}
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action set_egress_port_and_mac (port_t out_port, mac_addr_t mac_addr) {
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hdr.ethernet.dst_addr = mac_addr;
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standard_metadata.egress_spec = out_port;
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}
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action controller_reply(task_t task) {
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meta.task = task;
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meta.ingress_port = standard_metadata.ingress_port;
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clone3(CloneType.I2E, 100, meta);
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}
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action controller_debug_table_id(table_t table_id) {
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meta.table_id = table_id;
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controller_reply(TASK_DEBUG);
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}
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action controller_debug() {
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controller_reply(TASK_DEBUG);
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}
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action multicast_pkg(mcast_t mcast_grp) { /* Output PKG on correct ports (plural) */
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standard_metadata.mcast_grp = mcast_grp;
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}
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/********************** NAT64 / NAT46 ACTIONS ***********************************/
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/* changes for icmp6 -> icmp */
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action nat64_icmp6_generic()
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{
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hdr.icmp.setValid();
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hdr.ipv4.protocol = PROTO_ICMP; // overwrite generic same protocol assumption
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/* trigger checksumming */
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meta.switch_task = TASK_CHECKSUM_ICMP;
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meta.chk_icmp = 1;
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hdr.icmp6.setInvalid();
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/* not needed, as we don't translate them (yet/ever) */
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hdr.icmp6_na_ns.setInvalid();
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hdr.icmp6_option_link_layer_addr.setInvalid();
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}
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/* NAT64 protocol unspecific changes */
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action nat64_generic(ipv4_addr_t src, ipv4_addr_t dst) {
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hdr.ipv4.setValid();
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/* Stuff that might need to be fixed */
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hdr.ipv4.version = (bit<4>)4;
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hdr.ipv4.diff_serv = (bit<6>)0; // no ToS
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hdr.ipv4.ecn = (bit<2>)0; // unsupported
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/* 5 is ok as long as we don't use options / padding /
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anything after the destination address */
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hdr.ipv4.ihl = (bit<4>) 5; // internet header length: 4*5 = 20
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hdr.ipv4.totalLen = (bit<16>) hdr.ipv6.payload_length + 20; // ok under above constraints
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hdr.ipv4.identification = (bit<16>) 0; // no support for fragments
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hdr.ipv4.flags = (bit<3>) 0; // DF bit and more fragments, unsupported ATM
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hdr.ipv4.fragOffset = (bit<13>) 0; // 0 as there are no fragments
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/* Stuff that should be fine */
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hdr.ethernet.ethertype = TYPE_IPV4;
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hdr.ipv4.dst_addr = dst;
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hdr.ipv4.src_addr = src;
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hdr.ipv4.ttl = hdr.ipv6.hop_limit;
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hdr.ipv4.protocol = hdr.ipv6.next_header;
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hdr.ipv6.setInvalid();
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}
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/* nat64_prefix is the same as the matching key, but without the mask */
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action nat64_static(ipv6_addr_t v6_src, ipv4_addr_t v4_dst, ipv6_addr_t nat64_prefix) {
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ipv6_addr_t src_offset = hdr.ipv6.src_addr - v6_src;
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ipv4_addr_t src = v4_dst + (ipv4_addr_t) src_offset;
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ipv4_addr_t dst = (ipv4_addr_t) (hdr.ipv6.dst_addr - nat64_prefix);
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nat64_generic(src, dst);
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}
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/* From https://tools.ietf.org/html/rfc792 (IPv4)
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Echo or Echo Reply Message
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0 1 2 3
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0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Type | Code | Checksum |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Identifier | Sequence Number |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Data ...
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+-+-+-+-+-
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From https://tools.ietf.org/html/rfc4443#section-4.1
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4.1. Echo Request Message
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0 1 2 3
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0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Type | Code | Checksum |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Identifier | Sequence Number |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Data ...
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+-+-+-+-+-
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4.2. Echo Reply Message
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0 1 2 3
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0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Type | Code | Checksum |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Identifier | Sequence Number |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Data ...
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+-+-+-+-+-
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Type / code are different in ICMP4 and ICMP6!
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*/
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/* changes for icmp6 -> icmp */
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action nat46_icmp_generic()
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{
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hdr.icmp6.setValid();
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hdr.ipv6.next_header = PROTO_ICMP6;
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meta.chk_icmp6 = 1;
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hdr.icmp.setInvalid();
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}
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/* NAT46: protocol unspecific changes */
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action nat46_generic(ipv6_addr_t src, ipv6_addr_t dst) {
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hdr.ipv6.setValid();
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hdr.ipv4.setInvalid();
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hdr.ethernet.ethertype = TYPE_IPV6;
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hdr.ipv6.dst_addr = dst;
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hdr.ipv6.src_addr = src;
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hdr.ipv6.version = (bit<4>)6;
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hdr.ipv6.traffic_class = (bit<8>) hdr.ipv4.diff_serv;
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hdr.ipv6.flow_label = (bit<20>) 0;
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hdr.ipv6.payload_length = (bit<16>) hdr.ipv4.totalLen - 20;
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hdr.ipv6.next_header = hdr.ipv4.protocol;
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hdr.ipv6.hop_limit = hdr.ipv4.ttl;
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}
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/* matching key: v4_network specified again */
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action nat46_static(ipv6_addr_t v6_src, ipv4_addr_t v4_dst, ipv6_addr_t nat64_prefix) {
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ipv6_addr_t src = nat64_prefix + (ipv6_addr_t) hdr.ipv4.src_addr;
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ipv4_addr_t dst_offset = hdr.ipv4.dst_addr - v4_dst;
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ipv6_addr_t dst = v6_src + (ipv6_addr_t) dst_offset;
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nat46_generic(src, dst);
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}
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table nat64 {
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key = {
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hdr.ipv6.dst_addr: lpm;
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}
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actions = {
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controller_debug;
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nat64_static;
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controller_debug_table_id;
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NoAction;
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}
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size = NAT64_TABLE_SIZE;
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default_action = controller_debug_table_id(TABLE_NAT64);
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}
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table nat46 {
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key = {
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hdr.ipv4.dst_addr: lpm;
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}
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actions = {
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controller_debug;
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nat46_static;
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controller_debug_table_id;
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NoAction;
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}
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size = NAT64_TABLE_SIZE;
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default_action = controller_debug_table_id(TABLE_NAT46);
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}
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/********************** ICMP6 + NDP + ICMP ***********************************/
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/* old/unused action -- is it??*/
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action icmp6_answer() {
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if(hdr.icmp6.isValid()) {
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if(hdr.icmp6.code == ICMP6_ECHO_REQUEST) {
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ipv6_addr_t tmp = hdr.ipv6.src_addr;
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hdr.ipv6.src_addr = hdr.ipv6.dst_addr;
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hdr.ipv6.dst_addr = tmp;
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hdr.icmp6.code = ICMP6_ECHO_REPLY;
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}
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}
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}
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action icmp6_neighbor_solicitation(ipv6_addr_t addr, mac_addr_t mac_addr) {
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/* egress = ingress */
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standard_metadata.egress_spec = standard_metadata.ingress_port;
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/* 1. IPv6 changes */
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hdr.ipv6.dst_addr = hdr.ipv6.src_addr;
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hdr.ipv6.src_addr = addr;
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/* 2. ICMP6 changes */
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hdr.icmp6.type = ICMP6_NA;
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hdr.icmp6.code = 0;
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hdr.icmp6.checksum = 42; // checksum is calculated in deparser - marking with 42 to see whether it is calculated
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/* 3. icmp6/neighbor advertisement: values taken from real world answers */
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hdr.icmp6_na_ns.router = 0;
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hdr.icmp6_na_ns.solicitated = 1;
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hdr.icmp6_na_ns.override = 1;
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hdr.icmp6_na_ns.reserved = 0;
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hdr.icmp6_na_ns.target_addr = addr;
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/* 4. Link layer options */
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hdr.icmp6_option_link_layer_addr.type = ICMP6_NDP_OPT_TARGET_LL;
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hdr.icmp6_option_link_layer_addr.ll_length = 1; /* 1* 64 bit */
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hdr.icmp6_option_link_layer_addr.mac_addr = mac_addr;
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/* 5. Checksum trigger/info */
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meta.chk_icmp6_na_ns = 1;
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meta.cast_length = (bit<32>) hdr.ipv6.payload_length;
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}
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action icmp6_echo_reply() {
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mac_addr_t mac_tmp = hdr.ethernet.dst_addr;
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hdr.ethernet.dst_addr = hdr.ethernet.src_addr;
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hdr.ethernet.src_addr = mac_tmp;
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ipv6_addr_t addr_tmp = hdr.ipv6.dst_addr;
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hdr.ipv6.dst_addr = hdr.ipv6.src_addr;
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hdr.ipv6.src_addr = addr_tmp;
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hdr.icmp6.type = ICMP6_ECHO_REPLY;
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meta.chk_icmp6 = 1;
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meta.cast_length = (bit<32>) hdr.ipv6.payload_length;
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}
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table icmp6 {
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key = {
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hdr.ipv6.dst_addr: lpm;
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hdr.icmp6.type: exact;
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}
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actions = {
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controller_debug;
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icmp6_neighbor_solicitation;
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icmp6_echo_reply;
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controller_debug_table_id;
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NoAction;
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}
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size = ICMP6_TABLE_SIZE;
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default_action = controller_debug_table_id(TABLE_ICMP6);
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}
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action icmp_echo_reply() {
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mac_addr_t mac_tmp = hdr.ethernet.dst_addr;
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ipv4_addr_t ipv4_tmp = hdr.ipv4.src_addr;
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/* swap ethernet addresses */
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hdr.ethernet.dst_addr = hdr.ethernet.src_addr;
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hdr.ethernet.src_addr = mac_tmp;
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/* swap ipv4 addresses */
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hdr.ipv4.src_addr = hdr.ipv4.dst_addr;
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hdr.ipv4.dst_addr = ipv4_tmp;
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/* set correct type */
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hdr.icmp.type = ICMP_ECHO_REPLY;
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meta.chk_icmp = 1;
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}
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table icmp {
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key = {
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hdr.ipv4.dst_addr: lpm;
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hdr.icmp.type: exact;
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}
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actions = {
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icmp_echo_reply;
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controller_debug_table_id;
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NoAction;
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}
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size = ICMP_TABLE_SIZE;
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default_action = controller_debug_table_id(TABLE_ICMP);
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}
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/********************** debugging / general support ***********************************/
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// table port2mcast {
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// key = {
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// standard_metadata.ingress_port : exact;
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// }
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// actions = {
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// multicast_pkg;
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// controller_debug;
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// NoAction;
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// }
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// size = NDP_TABLE_SIZE;
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// default_action = NoAction;
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// }
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// /* Handle multicast registration of NDP */
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// table addr2mcast {
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// key = {
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// hdr.ipv6.dst_addr: exact;
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// }
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// actions = {
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// multicast_pkg;
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// controller_debug;
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// NoAction;
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// }
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// size = NDP_TABLE_SIZE;
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// default_action = NoAction;
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// }
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/********************** ARP ***********************************/
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action arp_reply(mac_addr_t mac_addr) {
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/* swap */
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ipv4_addr_t ipv4_src = hdr.arp.dst_ipv4_addr;
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ipv4_addr_t ipv4_dst = hdr.arp.src_ipv4_addr;
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/* swap/add */
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mac_addr_t mac_src = mac_addr;
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mac_addr_t mac_dst = hdr.arp.src_mac_addr;
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/* fill the ethernet header */
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hdr.ethernet.dst_addr = mac_dst;
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hdr.ethernet.src_addr = mac_src;
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/* fill the arp header */
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hdr.arp.dst_mac_addr = mac_dst;
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hdr.arp.src_mac_addr = mac_src;
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/* swapping */
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hdr.arp.dst_ipv4_addr = ipv4_dst;
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hdr.arp.src_ipv4_addr = ipv4_src;
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hdr.arp.opcode = ARP_REPLY;
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}
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table v4_arp {
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key = {
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hdr.ethernet.dst_addr: exact;
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hdr.arp.opcode: exact;
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hdr.arp.dst_ipv4_addr: lpm;
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}
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actions = {
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controller_debug_table_id;
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arp_reply;
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NoAction;
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}
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size = ICMP6_TABLE_SIZE;
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default_action = controller_debug_table_id(TABLE_ARP);
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}
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table v4_arp_egress {
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key = {
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hdr.arp.dst_ipv4_addr: lpm;
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}
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actions = {
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controller_debug_table_id;
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set_egress_port;
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NoAction;
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}
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size = ICMP6_TABLE_SIZE;
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default_action = controller_debug_table_id(TABLE_ARP_EGRESS);
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}
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/********************** ROUTING (egress definiton) TABLES ***********************************/
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table v6_networks {
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key = {
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hdr.ipv6.dst_addr: lpm;
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}
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actions = {
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set_egress_port;
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set_egress_port_and_mac;
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controller_debug;
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controller_reply;
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controller_debug_table_id;
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NoAction;
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}
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size = ROUTING_TABLE_SIZE;
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default_action = controller_debug_table_id(TABLE_V6_NETWORKS);
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}
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table v4_networks {
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key = {
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hdr.ipv4.dst_addr: lpm;
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}
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actions = {
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set_egress_port;
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set_egress_port_and_mac;
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controller_debug;
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controller_debug_table_id;
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NoAction;
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}
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size = ROUTING_TABLE_SIZE;
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default_action = controller_debug_table_id(TABLE_V4_NETWORKS);
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}
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/********************** APPLYING TABLES ***********************************/
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apply {
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if(hdr.ipv6.isValid()) {
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if(nat64.apply().hit) { /* generic nat64 done */
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if(hdr.icmp6.isValid()) {
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nat64_icmp6_generic();
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if(hdr.icmp6.type == ICMP6_ECHO_REPLY) {
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hdr.icmp.type = ICMP_ECHO_REPLY;
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}
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if(hdr.icmp6.type == ICMP6_ECHO_REQUEST) {
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hdr.icmp.type = ICMP_ECHO_REQUEST;
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}
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}
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v4_networks.apply(); /* apply egress for IPv4 */
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exit; /* no further v6 processing */
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}
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icmp6.apply(); /* icmp6 echo, icmp6 ndp */
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v6_networks.apply(); /* regular egress / routing */
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} else if(hdr.ipv4.isValid()) {
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if(icmp.apply().hit) {
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v4_networks.apply();
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exit;
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} else if(nat46.apply().hit) {
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if(hdr.icmp.isValid()) {
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nat46_icmp_generic();
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if(hdr.icmp.type == ICMP_ECHO_REPLY) {
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hdr.icmp6.type = ICMP6_ECHO_REPLY;
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}
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if(hdr.icmp.type == ICMP_ECHO_REQUEST) {
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hdr.icmp6.type = ICMP6_ECHO_REQUEST;
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}
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}
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v6_networks.apply();
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exit;
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}
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v4_networks.apply(); /* regular routing, egress */
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} else if(hdr.arp.isValid()) {
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if(v4_arp.apply().hit) {
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v4_arp_egress.apply();
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}
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}
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}
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}
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/*************************************************************************
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**************** E G R E S S P R O C E S S I N G *******************
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*************************************************************************/
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control MyEgress(inout headers hdr,
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inout metadata meta,
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inout standard_metadata_t standard_metadata) {
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|
apply {
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// ingress clone
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|
if (standard_metadata.instance_type == 1){
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|
hdr.cpu.setValid();
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|
hdr.cpu.task = meta.task;
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|
hdr.cpu.ethertype = hdr.ethernet.ethertype;
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hdr.cpu.ingress_port = (bit<16>) meta.ingress_port;
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|
hdr.cpu.table_id = meta.table_id;
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|
|
|
hdr.ethernet.ethertype = TYPE_CPU;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*************************************************************************
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|
*********************** S W I T C H *******************************
|
|
*************************************************************************/
|
|
|
|
V1Switch(
|
|
MyParser(),
|
|
MyVerifyChecksum(),
|
|
MyIngress(),
|
|
MyEgress(),
|
|
MyComputeChecksum(),
|
|
MyDeparser()
|
|
) main; |