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Begin checksumming icmp4

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Nico Schottelius 2019-03-27 18:01:11 +01:00
parent 7c93952c53
commit 404d4ff0df
4 changed files with 33 additions and 5 deletions
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7
doc/plan.org
View file

@ -479,8 +479,10 @@ INFO:main:unhandled reassambled=<Ether dst=00:00:0a:00:00:42 src=00:00:0a:00:00
***** DONE source correctly translated to 10.1.1.1
***** DONE destination correctly translated to 10.0.0.1 -> pings h3
***** DONE egress is correct, comes out at h3
***** TODO protocol 58 is wrong -> should be 1
**** TODO transform protocol specific: icmp6 -> icmp
***** DONE protocol 58 is wrong -> should be 1
***** DONE figure out switch() syntax
***** TODO Calculate ICMP checksum
***** TODO transform protocol specific: icmp6 -> icmp
**** TODO transform protocol specific: icmp -> icmp6
**** TODO Make switch answer IPv4 icmp echo request for
**** TODO Add / check default route for v4 hosts
@ -1402,6 +1404,7 @@ Only the destination network is matched for deciding on NAT64, as
priority based double LPM is not supported. This limits a prefix to be
used only in one network.
*** References / Follow up
**** RFC 1017 ICMP checksum https://tools.ietf.org/html/rfc1071
**** RFC 2460 IPv6 (Checksum https://tools.ietf.org/html/rfc2460#section-8.1)
**** RFC 3810 MLD2 https://tools.ietf.org/html/rfc3810
**** RFC 4443 ICMPv6 https://tools.ietf.org/html/rfc4443

8
p4src/checksums.p4
View file

@ -60,6 +60,14 @@ control MyComputeChecksum(inout headers hdr, inout metadata meta) {
HashAlgorithm.csum16
);
update_checksum_with_payload(meta.switch_task == TASK_CHECKSUM_ICMP,
{
hdr.icmp.type,
hdr.icmp.code
},
hdr.icmp.checksum,
HashAlgorithm.csum16
);
}
}

6
p4src/headers.p4
View file

@ -38,6 +38,10 @@ const bit<8> ICMP6_ECHO_REPLY = 129;
const bit<8> ICMP6_NS = 135;
const bit<8> ICMP6_NA = 136;
const bit<8> ICMP_ECHO_REPLY = 0;
const bit<8> ICMP_ECHO_REQUEST = 8;
/* RFC4861, Section 4.6 */
const bit<8> ICMP6_NDP_OPT_SOURCE_LL = 1;
const bit<8> ICMP6_NDP_OPT_TARGET_LL = 2;
@ -52,6 +56,7 @@ const task_t TASK_DEBUG = 3;
const task_t TASK_ICMP6_REPLY = 4;
const task_t TASK_CHECKSUM_ICMP6 = 5; /* data plane */
const task_t TASK_CHECKSUM_ICMP6_NA = 6; /* data plane */
const task_t TASK_CHECKSUM_ICMP = 7; /* data plane */
/* 48+48+16 = 112 */
@ -147,7 +152,6 @@ header icmp_t {
bit<8> type;
bit<8> code;
bit<16> checksum;
bit<32> rest;
}

17
p4src/static-mapping.p4
View file

@ -54,7 +54,22 @@ control MyIngress(inout headers hdr,
*/
action nat64_icmp6()
{
hdr.icmp.setValid();
hdr.ipv4.protocol = PROTO_ICMP; // overwrite generic same protocol assumption
switch(hdr.icmp6.type) {
ICMP6_ECHO_REQUEST: hdr.icmp.type = ICMP_ECHO_REQUEST;
ICMP6_ECHO_REPLY: hdr.icmp.type = ICMP_ECHO_REPLY;
}
/* trigger checksumming */
meta.switch_task = TASK_CHECKSUM_ICMP;
hdr.icmp6.setInvalid();
/* not needed, as we don't translate them (yet/ever) */
hdr.icmp6_na_ns.setInvalid();
hdr.icmp6_option_link_layer_addr.setInvalid();
}
@ -120,8 +135,6 @@ control MyIngress(inout headers hdr,
nat64_generic(src, dst);
/* fix the protocol specific translations */
// switch() ...
}
/* matching key: v4_network specified again */