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Prepare switch for fully answering NDP/NS query 

Including parser which might be broken in case there are no options present
This commit is contained in:
Nico Schottelius 2019-03-23 14:15:31 +01:00
parent f79033c0c9
commit 9f5a37f7f6
3 changed files with 41 additions and 6 deletions
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15
p4src/headers.p4
View File

@ -31,7 +31,14 @@ const bit<8> ICMP6_ECHO_REPLY = 129;
const bit<8> ICMP6_NS = 135;
const bit<8> ICMP6_NA = 136;
/* RFC4861, Section 4.6 */
const bit<8> ICMP6_NDP_OPT_SOURCE_LL = 1;
const bit<8> ICMP6_NDP_OPT_TARGET_LL = 2;
const bit<8> ICMP6_NDP_OPT_PREFIX_INFO = 3;
const bit<8> ICMP6_NDP_OPT_REDIR_HEADER = 4;
const bit<8> ICMP6_NDP_OPT_MTU = 5;
/* Tasks from switch to controller - no RFC, internal */
const task_t TASK_ICMP6_NS = 1;
const task_t TASK_ICMP6_GENERAL = 2;
const task_t TASK_DEBUG = 3;
@ -119,6 +126,13 @@ header icmp6_na_ns_t {
ipv6_addr_t target_addr;
}
header icmp6_option_link_layer_addr_t {
bit<8> type;
bit<8> ll_length;
mac_addr_t mac_addr;
}
header icmp_t {
bit<8> type;
bit<8> code;
@ -143,6 +157,7 @@ struct headers {
cpu_t cpu;
icmp6_t icmp6;
icmp6_na_ns_t icmp6_na_ns;
icmp6_option_link_layer_addr_t icmp6_option_link_layer_addr;
}
struct metadata {

7
p4src/parsers.p4
View File

@ -55,9 +55,12 @@ parser MyParser(packet_in packet,
}
state icmp6_neighbor_solicitation {
packet.extract(hdr.icmp6_na_ns);
transition accept;
packet.extract(hdr.icmp6_na_ns);
/* BUG: This MIGHT fail */
packet.extract(hdr.icmp6_option_link_layer_addr);
transition accept;
}

25
p4src/static-mapping.p4
View File

@ -42,23 +42,40 @@ control MyIngress(inout headers hdr,
standard_metadata.mcast_grp = mcast_grp;
}
action icmp6_neighbor_solicitation(ipv6_addr_t addr, mac_addr_t hwaddr) {
action icmp6_neighbor_solicitation(ipv6_addr_t addr, mac_addr_t mac_addr) {
/* egress = ingress */
standard_metadata.egress_spec = standard_metadata.ingress_port;
/* 1. IPv6 changes */
hdr.ipv6.dst_addr = hdr.ipv6.src_addr;
hdr.ipv6.src_addr = addr;
/* 2. ICMP6 changes */
hdr.icmp6.type = ICMP6_NA;
hdr.icmp6.code = 0;
// checksum is calculated in deparser
/* ether + ipv6 + icmp6 */
ipv6_addr_t tgt_addr =
/* 3. icmp6/neighbor advertisement: values taken from real world answers */
hdr.icmp6_na_ns.router = 0;
hdr.icmp6_na_ns.solicitated = 1;
hdr.icmp6_na_ns.override = 1;
hdr.icmp6_na_ns.reserved = 0;
hdr.icmp6_na_ns.target_addr = addr;
/* 4. Link layer options */
hdr.icmp6_option_link_layer_addr.type = ICMP6_NDP_OPT_TARGET_LL;
hdr.icmp6_option_link_layer_addr.ll_length = 1; /* 1* 64 bit */
hdr.icmp6_option_link_layer_addr.mac_addr = mac_addr;
/* version1: rebuilding packet */
/*
truncate((bit<32>)(112 + 320 + 32)/8);
hdr.icmp6_na.setValid();
hdr.icmp6_na.solicitated = 1;
hdr.icmp6_na.override = 1;
*/
/* checksum trigger / content */
meta.do_cksum = 1;