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+ reorg +add simple nat64 w/o protocol specific translations

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This commit is contained in:
Nico Schottelius 2019-03-23 16:20:13 +01:00
commit a408d7a803
3 changed files with 130 additions and 87 deletions
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57
p4src/static-mapping.p4
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@ -52,7 +52,7 @@ control MyIngress(inout headers hdr,
hdr.ipv4.diff_serv = (bit<6>)0; // no ToS
hdr.ipv4.ecn = (bit<2>)0; // unsupported
hdr.ipv4.ihl = (bit<4>) 5; // internet header length -- needs to be dynamic!
hdr.ipv4.ihl = (bit<4>) 5; // internet header length -- needs to be dynamic!?
hdr.ipv4.totalLen = (bit<16>) hdr.ipv6.payload_length + 5; // should probably also dynamic
hdr.ipv4.identification = (bit<16>) 0; // no support for fragments
@ -93,25 +93,58 @@ control MyIngress(inout headers hdr,
/* nat64_prefix is the same as the matching key, but without the mask */
action nat64_static(ipv6_addr_t v6_network, ipv4_addr_t v4_network, ipv6_addr_t nat64_prefix) {
ipv6_addr_t src_offset = hdr.ipv6.src_addr - v6_network;
ipv4_addr_t src = v4_network + (ipv4_addr_t) src_offset;
action nat64_static(ipv6_addr_t v6_src, ipv4_addr_t v4_dst, ipv6_addr_t nat64_prefix) {
ipv6_addr_t src_offset = hdr.ipv6.src_addr - v6_src;
ipv4_addr_t src = v4_dst + (ipv4_addr_t) src_offset;
ipv4_addr_t dst = (ipv4_addr_t) (hdr.ipv6.dst_addr - nat64_prefix);
nat64_generic(src, dst);
/* fix the protocol specific translations */
// switch() ...
}
/* matching key: v4_network specified again */
action nat46_static(ipv6_addr_t v6_network, ipv4_addr_t v4_network, ipv6_addr_t nat64_prefix ) {
action nat46_static(ipv6_addr_t v6_src, ipv4_addr_t v4_dst, ipv6_addr_t nat64_prefix) {
ipv6_addr_t src = nat64_prefix + (ipv6_addr_t) hdr.ipv4.src_addr;
ipv4_addr_t dst_offset = hdr.ipv4.dst_addr - v4_network;
ipv6_addr_t dst = v6_network + (ipv6_addr_t) dst_offset;
ipv4_addr_t dst_offset = hdr.ipv4.dst_addr - v4_dst;
ipv6_addr_t dst = v6_src + (ipv6_addr_t) dst_offset;
nat46_generic(src, dst);
/* fix the protocol specific translations */
// switch() ...
}
table nat64 {
key = {
hdr.ipv6.src_addr: lpm;
hdr.ipv6.dst_addr: lpm;
}
actions = {
controller_debug;
nat64_static;
NoAction;
}
size = NAT64_TABLE_SIZE;
default_action = controller_debug;
}
table nat46 {
key = {
hdr.ipv4.src_addr: lpm;
hdr.ipv4.dst_addr: lpm;
}
actions = {
controller_debug;
nat46_static;
NoAction;
}
size = NAT64_TABLE_SIZE;
default_action = controller_debug;
}
/********************** ICMP6 ***********************************/
@ -272,8 +305,6 @@ control MyIngress(inout headers hdr,
set_egress_port;
controller_debug;
controller_reply;
nat64_static;
icmp6_neighbor_solicitation;
NoAction;
}
size = ROUTING_TABLE_SIZE;
@ -287,7 +318,6 @@ control MyIngress(inout headers hdr,
}
actions = {
set_egress_port;
nat46_static;
NoAction;
}
size = ROUTING_TABLE_SIZE;
@ -297,12 +327,9 @@ control MyIngress(inout headers hdr,
/********************** APPLYING TABLES ***********************************/
apply {
if(hdr.ipv6.isValid()) {
/* FIXME: structure / use .hit to do logic */
// ndp_answer.apply();
//ndp.apply(); /* flood or if it is us - answer */
icmp6.apply();
v6_networks.apply();
icmp6.apply(); /* icmp6 echo, icmp6 ndp */
v6_networks.apply(); /* routing, egress */
}
if(hdr.ipv4.isValid()) {
v4_networks.apply();