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[p4,controller] Begin to add icmp6 echo reply support + more NDP "fixes"

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This commit is contained in:
Nico Schottelius 2019-02-23 19:52:01 +01:00
parent 6b601a09f7
commit c38eb0dfc4
5 changed files with 58 additions and 4 deletions
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11
p4app/controller.py
View file

@ -110,8 +110,7 @@ class L2Controller(object):
self.controller.table_clear("v6_addresses")
for v6addr in self.v6_addresses[self.mode]:
self.controller.table_add("v6_addresses", "icmp6_answer", [v6addr['addr']], [v6addr['port']])
self.controller.table_add("v6_addresses", "icmp6_answer", [v6addr['addr']])
def config_hosts(self):
@ -133,6 +132,14 @@ class L2Controller(object):
# mx h$i "ip -6 route add default via 2001:db8:6::42"
#for v4route in self.v4_routes[self.mode]:
# Todo: add v4 routes / ip addresses
# Fake mac addresses - this gets REALLY messy now
# for host in range(4):
# macrange = [1, 2, 3, 4, 42]
# for mac in macrange:
# subprocess.call(["mx", host, "ip", "addr", "add", ipaddr, "dev", dev])
def debug_print_pkg(self, pkg, msg="INCOMING"):

3
p4app/static-mapping.sh
View file

@ -17,7 +17,8 @@ for i in 1 2; do
# add neighbors
for j in 1 2 42; do
mx h$i "ip -6 neigh add 2001:db8:6::${j} dev $dev lladdr 00:00:0a:00:00:0${j}"
mx h$i "ip -6 neigh add 2001:db8:61::${j} dev $dev lladdr 00:00:0a:00:00:0${j}"
mx h$i "ip -6 neigh add 2001:db8:62::${j} dev $dev lladdr 00:00:0a:00:00:0${j}"
done
done

32
p4src/checksums.p4
View file

@ -21,6 +21,38 @@ control MyVerifyChecksum(inout headers hdr, inout metadata meta) {
control MyComputeChecksum(inout headers hdr, inout metadata meta) {
apply {
/* 512 bit+ according to
https://en.wikipedia.org/wiki/Transmission_Control_Protocol#TCP_checksum_for_IPv4
*/
update_checksum_with_payload(
hdr.ipv6.isValid(),
{
hdr.ipv6.src_addr, /* 128 */
hdr.ipv6.dst_addr, /* 128 */
meta.tcpLength,
24w0,
hdr.ipv6.next_header,
// TCP header
hdr.tcp.src_port,
hdr.tcp.dst_port,
hdr.tcp.seqNo,
hdr.tcp.ackNo,
hdr.tcp.data_offset,
hdr.tcp.res,
hdr.tcp.cwr,
hdr.tcp.ece,
hdr.tcp.urg,
hdr.tcp.ack,
hdr.tcp.psh,
hdr.tcp.rst,
hdr.tcp.syn,
hdr.tcp.fin,
hdr.tcp.window,
hdr.tcp.urgentPtr
},
hdr.tcp.checksum,
HashAlgorithm.csum16);
}
}

3
p4src/headers.p4
View file

@ -21,6 +21,9 @@ const bit<8> PROTO_ICMP6 = 58;
const bit<8> TCP_SEQ_LEN = 4;
const bit<8> ICMP6_ECHO_REQUEST = 128;
const bit<8> ICMP6_ECHO_REPLY = 129;
header ethernet_t {
mac_addr_t dst_addr;

13
p4src/static-mapping.p4
View file

@ -17,7 +17,17 @@ control MyIngress(inout headers hdr,
inout standard_metadata_t standard_metadata) {
/********************** ADDRESS TABLES ***********************************/
action icmp6_answer(port_t port) {
action icmp6_answer() {
if(hdr.icmp6.isValid()) {
if(hdr.icmp6.code == ICMP6_ECHO_REQUEST) {
ipv6_addr_t tmp = hdr.ipv6.src_addr;
hdr.ipv6.src_addr = hdr.ipv6.dst_addr;
hdr.ipv6.dst_addr = tmp;
hdr.icmp6.code = ICMP6_ECHO_REPLY;
}
}
/* do something:
- change src/dst
- change type
@ -27,6 +37,7 @@ control MyIngress(inout headers hdr,
table v6_addresses {
key = {
hdr.ipv6.dst_addr: exact;
// hdr.ipv6.next_header: exact;
}
actions = {
icmp6_answer;