321 lines
9.3 KiB
Text
321 lines
9.3 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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/********************** 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 controller_debug() {
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meta.task = TASK_DEBUG;
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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_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 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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action icmp6_neighbor_solicitation(ipv6_addr_t addr) {
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/* egress = ingress */
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standard_metadata.egress_spec = standard_metadata.ingress_port;
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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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hdr.icmp6.type = ICMP6_NA;
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/* checksum trigger / content */
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meta.do_cksum = 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.do_cksum = 1;
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meta.cast_length = (bit<32>) hdr.ipv6.payload_length;
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}
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/********************** NAT64 / NAT46 ACTIONS ***********************************/
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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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/* 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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hdr.ipv4.ihl = (bit<4>) 5; // internet header length -- needs to be dynamic!
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hdr.ipv4.totalLen = (bit<16>) hdr.ipv6.payload_length + 5; // should probably also dynamic
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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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hdr.ipv4.setValid();
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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.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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hdr.ipv4.setInvalid();
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hdr.ipv6.setValid();
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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_network, ipv4_addr_t v4_network, ipv6_addr_t nat64_prefix) {
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ipv6_addr_t src_offset = hdr.ipv6.src_addr - v6_network;
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ipv4_addr_t src = v4_network + (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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/* matching key: v4_network specified again */
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action nat46_static(ipv6_addr_t v6_network, ipv4_addr_t v4_network, 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_network;
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ipv6_addr_t dst = v6_network + (ipv6_addr_t) dst_offset;
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nat46_generic(src, dst);
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}
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/********************** Reply to NDP for US ***********************************/
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table ndp_answer {
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key = {
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hdr.ipv6.dst_addr: exact; /* our multicast embedded mac address */
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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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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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/********************** 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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// default_action = controller_debug;
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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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// default_action = controller_debug;
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}
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/********************** NDP support ***********************************/
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table ndp {
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key = {
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hdr.ipv6.dst_addr: lpm;
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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 = controller_debug;
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}
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/********************** ADDRESS TABLES ***********************************/
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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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/* do something:
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- change src/dst
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- change type
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*/
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}
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/********************** ROUTING (egress definiton) TABLES ***********************************/
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table v6_addresses {
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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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controller_debug;
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controller_reply;
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icmp6_echo_reply;
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NoAction;
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}
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size = ADDRESS_TABLE_SIZE;
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default_action = NoAction;
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}
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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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controller_debug;
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controller_reply;
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nat64_static;
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icmp6_neighbor_solicitation;
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NoAction;
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}
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size = ROUTING_TABLE_SIZE;
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// default_action = NoAction;
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default_action = controller_debug;
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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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nat46_static;
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NoAction;
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}
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size = ROUTING_TABLE_SIZE;
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default_action = NoAction;
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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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/* FIXME: structure / use .hit to do logic */
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// ndp_answer.apply();
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//ndp.apply(); /* flood or if it is us - answer */
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v6_addresses.apply();
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v6_networks.apply();
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}
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if(hdr.ipv4.isValid()) {
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v4_networks.apply();
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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.ethernet.ethertype = TYPE_CPU;
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}
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}
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}
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/*************************************************************************
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*********************** S W I T C H *******************************
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*************************************************************************/
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V1Switch(
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MyParser(),
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MyVerifyChecksum(),
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MyIngress(),
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MyEgress(),
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MyComputeChecksum(),
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MyDeparser()
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) main;
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// truncate((bit<32>)22); //ether+cpu header
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