114 lines
3.4 KiB
Text
114 lines
3.4 KiB
Text
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#ifndef NICO_ICMP6_NDP_ICMP
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#define NICO_ICMP6_NDP_ICMP
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/********************** ICMP6 + NDP + ICMP ***********************************/
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/* old/unused action -- is it??*/
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action icmp6_answer() {
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if(hdr.icmp6.isValid()) {
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if(hdr.icmp6.code == ICMP6_ECHO_REQUEST) {
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ipv6_addr_t tmp = hdr.ipv6.src_addr;
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hdr.ipv6.src_addr = hdr.ipv6.dst_addr;
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hdr.ipv6.dst_addr = tmp;
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hdr.icmp6.code = ICMP6_ECHO_REPLY;
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}
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}
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}
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action icmp6_neighbor_solicitation(ipv6_addr_t addr, mac_addr_t mac_addr) {
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/* egress = ingress */
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standard_metadata.egress_spec = standard_metadata.ingress_port;
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/* 1. IPv6 changes */
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hdr.ipv6.dst_addr = hdr.ipv6.src_addr;
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hdr.ipv6.src_addr = addr;
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/* 2. ICMP6 changes */
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hdr.icmp6.type = ICMP6_NA;
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hdr.icmp6.code = 0;
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hdr.icmp6.checksum = 42; // checksum is calculated in deparser - marking with 42 to see whether it is calculated
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/* 3. icmp6/neighbor advertisement: values taken from real world answers */
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hdr.icmp6_na_ns.router = 0;
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hdr.icmp6_na_ns.solicitated = 1;
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hdr.icmp6_na_ns.override = 1;
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hdr.icmp6_na_ns.reserved = 0;
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hdr.icmp6_na_ns.target_addr = addr;
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/* 4. Link layer options */
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hdr.icmp6_option_link_layer_addr.type = ICMP6_NDP_OPT_TARGET_LL;
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hdr.icmp6_option_link_layer_addr.ll_length = 1; /* 1* 64 bit */
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hdr.icmp6_option_link_layer_addr.mac_addr = mac_addr;
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/* 5. Checksum trigger/info */
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meta.chk_icmp6_na_ns = 1;
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meta.cast_length = (bit<32>) hdr.ipv6.payload_length;
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}
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action icmp6_echo_reply() {
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mac_addr_t mac_tmp = hdr.ethernet.dst_addr;
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hdr.ethernet.dst_addr = hdr.ethernet.src_addr;
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hdr.ethernet.src_addr = mac_tmp;
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ipv6_addr_t addr_tmp = hdr.ipv6.dst_addr;
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hdr.ipv6.dst_addr = hdr.ipv6.src_addr;
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hdr.ipv6.src_addr = addr_tmp;
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hdr.icmp6.type = ICMP6_ECHO_REPLY;
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meta.chk_icmp6 = 1;
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meta.cast_length = (bit<32>) hdr.ipv6.payload_length;
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}
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table icmp6 {
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key = {
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hdr.ipv6.dst_addr: lpm;
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hdr.icmp6.type: exact;
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}
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actions = {
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controller_debug;
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icmp6_neighbor_solicitation;
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icmp6_echo_reply;
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controller_debug_table_id;
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NoAction;
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}
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size = ICMP6_TABLE_SIZE;
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default_action = controller_debug_table_id(TABLE_ICMP6);
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}
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action icmp_echo_reply() {
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mac_addr_t mac_tmp = hdr.ethernet.dst_addr;
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ipv4_addr_t ipv4_tmp = hdr.ipv4.src_addr;
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/* swap ethernet addresses */
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hdr.ethernet.dst_addr = hdr.ethernet.src_addr;
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hdr.ethernet.src_addr = mac_tmp;
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/* swap ipv4 addresses */
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hdr.ipv4.src_addr = hdr.ipv4.dst_addr;
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hdr.ipv4.dst_addr = ipv4_tmp;
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/* set correct type */
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hdr.icmp.type = ICMP_ECHO_REPLY;
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meta.chk_icmp = 1;
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}
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table icmp {
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key = {
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hdr.ipv4.dst_addr: lpm;
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hdr.icmp.type: exact;
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}
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actions = {
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icmp_echo_reply;
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controller_debug_table_id;
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NoAction;
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}
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size = ICMP_TABLE_SIZE;
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// default_action = controller_debug_table_id(TABLE_ICMP);
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default_action = NoAction; /* do not clone on miss */
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}
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#endif
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