Add code to mimic if in action
New table logic, new actions
This commit is contained in:
Nico Schottelius
parent
ac96fe467d
commit
d6264a32a4
2 changed files with 74 additions and 84 deletions
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@ -38,6 +38,17 @@ table_id_fields = {
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5: 'TABLE_V4_NETWORKS'
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}
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table_proto = {
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'ICMP6_ECHO_REQUEST' : 128,
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'ICMP6_ECHO_REPLY' : 129,
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'ICMP6_NS' : 135,
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'ICMP6_NA' : 136,
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'ICMP_ECHO_REPLY' : 0,
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'ICMP_ECHO_REQUEST' : 8
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}
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class CpuHeader(Packet):
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name = 'CpuPacket'
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fields_desc = [
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@ -273,17 +284,41 @@ class L2Controller(object):
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v6_src, v6_dst, v4_dst,
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v4_src, v4_dst, v6_src))
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# [str(v6_src)
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self.controller.table_add("nat64", "nat64_static",
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[str(v6_dst)],
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self.controller.table_add("nat64_icmp6",
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"nat64_icmp6_echo_request",
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[str(v6_dst),
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str(table_proto['ICMP6_ECHO_REQUEST'])
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],
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[str(v6_src.network_address),
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str(v4_dst.network_address),
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str(v6_dst.network_address)]
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)
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# [str(v4_src)
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self.controller.table_add("nat46", "nat46_static",
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[str(v4_dst)],
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self.controller.table_add("nat64_icmp6",
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"nat64_icmp6_echo_reply",
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[str(v6_dst),
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str(table_proto['ICMP6_ECHO_REPLY'])
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],
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[str(v6_src.network_address),
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str(v4_dst.network_address),
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str(v6_dst.network_address)]
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)
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self.controller.table_add("nat46_icmp",
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"nat46_icmp_echo_reply",
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[str(v4_dst)
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str(table_proto['ICMP_ECHO_REPLY'])
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],
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[str(v6_src.network_address),
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str(v4_dst.network_address),
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str(v6_dst.network_address)]
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)
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self.controller.table_add("nat46_icmp",
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"nat46_icmp_echo_request",
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[str(v4_dst)
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str(table_proto['ICMP_ECHO_REQUEST'])
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],
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[str(v6_src.network_address),
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str(v4_dst.network_address),
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str(v6_dst.network_address)]
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@ -48,28 +48,28 @@ control MyIngress(inout headers hdr,
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/********************** NAT64 / NAT46 ACTIONS ***********************************/
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/* if replacing actions */
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action nat64_icmp6_echo_request(ipv6_addr_t v6_src, ipv4_addr_t v4_dst, ipv6_addr_t nat64_prefix) {
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nat64_static(v6_src, v4_dst, nat64_prefix);
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nat64_icmp6();
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action mimic_assign_echo_request()
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{
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hdr.icmp.type = ICMP_ECHO_REQUEST;
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}
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/* changes for icmp6 -> icmp
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- first echo request/reply
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- later maybe other
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*/
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action nat64_icmp6_echo_reply(ipv6_addr_t v6_src, ipv4_addr_t v4_dst, ipv6_addr_t nat64_prefix) {
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nat64_static(v6_src, v4_dst, nat64_prefix);
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nat64_icmp6();
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hdr.icmp.type = ICMP_ECHO_REPLY;
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}
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/* changes for icmp6 -> icmp */
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action nat64_icmp6()
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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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// if(hdr.icmp6.type == ICMP6_ECHO_REQUEST) {
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// mimic_assign_echo_request();
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// }
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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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/* trigger checksumming */
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meta.switch_task = TASK_CHECKSUM_ICMP;
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@ -80,7 +80,6 @@ control MyIngress(inout headers hdr,
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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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@ -117,6 +116,8 @@ control MyIngress(inout headers hdr,
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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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@ -130,10 +131,8 @@ control MyIngress(inout headers hdr,
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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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}
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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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@ -142,7 +141,14 @@ control MyIngress(inout headers hdr,
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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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action nat46_icmp_echo_request(ipv6_addr_t v6_src, ipv4_addr_t v4_dst, ipv6_addr_t nat64_prefix) {
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; /* TBD */
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}
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action nat46_icmp_echo_reply(ipv6_addr_t v6_src, ipv4_addr_t v4_dst, ipv6_addr_t nat64_prefix) {
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; /* TBD */
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}
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/* matching key: v4_network specified again */
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@ -153,19 +159,17 @@ control MyIngress(inout headers hdr,
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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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/* fix the protocol specific translations */
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// switch() ...
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}
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table nat64 {
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table nat64_icmp6 {
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key = {
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hdr.ipv6.dst_addr: lpm;
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hdr.ipv6.next_header: exact;
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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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nat64_static;
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nat64_icmp6_echo_reply;
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nat64_icmp6_echo_request;
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controller_debug_table_id;
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NoAction;
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}
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@ -173,14 +177,15 @@ control MyIngress(inout headers hdr,
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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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table nat46_icmp {
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key = {
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// hdr.ipv4.src_addr: lpm;
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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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controller_debug;
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nat46_static;
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nat46_icmp_echo_reply;
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nat46_icmp_echo_request;
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controller_debug_table_id;
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NoAction;
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}
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@ -228,7 +233,6 @@ control MyIngress(inout headers hdr,
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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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/* version1: rebuilding packet */
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/*
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truncate((bit<32>)(112 + 320 + 32)/8);
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@ -369,64 +373,15 @@ control MyIngress(inout headers hdr,
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}
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/********************** APPLYING TABLES ***********************************/
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apply {
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/* V2: matching all protocols in same table */
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if(hdr.ipv6.isValid()) {
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switch(nat64.apply().action_run) {
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nat64_icmp6: { nat64_icmp6_if_table.apply() }
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nat64_tcp: { ... } // nothing, directly handled
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nat64_udp: { ... } // nothing, directly handled
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}
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/* not sure how to get .hit & .action_run */
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if(there_was_a_hit_in_nat64) {
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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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}
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/* V3: matching protocols in distinct tables */
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if(hdr.ipv6.isValid()) {
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switch(nat64_icmp6.apply().hit) {
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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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/* the next two might be able to be merged */
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switch(nat64_udp.apply().hit) {
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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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switch(nat64_tcp.apply().hit) {
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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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}
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switch(nat64.apply().action_run) {
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nat64_icmp6: { nat64_icmp6_if_table.apply() }
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nat64_tcp: { ... } // nothing, directly handled
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nat64_udp: { ... } // nothing, directly handled
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}
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/* not sure how to get .hit & .action_run */
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if(there_was_a_hit_in_nat64) {
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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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}
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apply {
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if(hdr.ipv6.isValid()) {
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icmp6.apply(); /* icmp6 echo, icmp6 ndp */
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switch(nat64.apply().action_run) {
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nat64_icmp6: { nat64_icmp6_if_table.apply() }
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}
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v4_networks.apply(); /* apply egress */
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if(nat64_icmp6.apply().hit) {
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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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v6_networks.apply(); /* egress / routing */
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} else if(hdr.ipv4.isValid()) {
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if(nat46.apply().hit) { /* v4->v6 */
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