You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
 
 
 
 
 
 

114 lines
3.4 KiB

#ifndef NICO_ICMP6_NDP_ICMP
#define NICO_ICMP6_NDP_ICMP
/********************** ICMP6 + NDP + ICMP ***********************************/
/* old/unused action -- is it??*/
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;
}
}
}
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;
hdr.icmp6.checksum = 42; // checksum is calculated in deparser - marking with 42 to see whether it is calculated
/* 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;
/* 5. Checksum trigger/info */
meta.chk_icmp6_na_ns = 1;
meta.cast_length = (bit<32>) hdr.ipv6.payload_length;
}
action icmp6_echo_reply() {
mac_addr_t mac_tmp = hdr.ethernet.dst_addr;
hdr.ethernet.dst_addr = hdr.ethernet.src_addr;
hdr.ethernet.src_addr = mac_tmp;
ipv6_addr_t addr_tmp = hdr.ipv6.dst_addr;
hdr.ipv6.dst_addr = hdr.ipv6.src_addr;
hdr.ipv6.src_addr = addr_tmp;
hdr.icmp6.type = ICMP6_ECHO_REPLY;
meta.chk_icmp6 = 1;
meta.cast_length = (bit<32>) hdr.ipv6.payload_length;
}
table icmp6 {
key = {
hdr.ipv6.dst_addr: lpm;
hdr.icmp6.type: exact;
}
actions = {
controller_debug;
icmp6_neighbor_solicitation;
icmp6_echo_reply;
controller_debug_table_id;
NoAction;
}
size = ICMP6_TABLE_SIZE;
default_action = controller_debug_table_id(TABLE_ICMP6);
}
action icmp_echo_reply() {
mac_addr_t mac_tmp = hdr.ethernet.dst_addr;
ipv4_addr_t ipv4_tmp = hdr.ipv4.src_addr;
/* swap ethernet addresses */
hdr.ethernet.dst_addr = hdr.ethernet.src_addr;
hdr.ethernet.src_addr = mac_tmp;
/* swap ipv4 addresses */
hdr.ipv4.src_addr = hdr.ipv4.dst_addr;
hdr.ipv4.dst_addr = ipv4_tmp;
/* set correct type */
hdr.icmp.type = ICMP_ECHO_REPLY;
meta.chk_icmp = 1;
}
table icmp {
key = {
hdr.ipv4.dst_addr: lpm;
hdr.icmp.type: exact;
}
actions = {
icmp_echo_reply;
controller_debug_table_id;
NoAction;
}
size = ICMP_TABLE_SIZE;
// default_action = controller_debug_table_id(TABLE_ICMP);
default_action = NoAction; /* do not clone on miss */
}
#endif