110 lines
3.0 KiB
C++
110 lines
3.0 KiB
C++
#include "ipv6.h"
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namespace ipv6 {
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/******** costants ********/
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IPv6Addr ALL_NODES_ADDRESS("\xff\x02\x00\x00\x00\x00\x00\x00\x01"); /* ff02::1 */
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/******** IPv6Addr ********/
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IPv6Addr::IPv6Addr() {;}
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IPv6Addr::IPv6Addr(const char* address) {
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this->deserialize(address);
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}
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void IPv6Addr::deserialize(const char* address) {
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memcpy(this->address, address, 16);
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}
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const char* IPv6Addr::serialize() {
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return this->address;
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}
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/******** IPv6Packet ********/
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char* IPv6Packet::serialize() { /* do we actually need these function? everything is already store in a tokenized/serialized form */
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return packet;
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}
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void IPv6Packet::deserialize(const char* buffer, uint8_t len) {
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memcpy(packet, buffer, len);
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}
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void IPv6Packet::setNextHeader(uint8_t next_header) {
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*(packet + 6) = next_header;
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}
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void IPv6Packet::setSrcAddress(IPv6Addr& address) {
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memcpy(packet + 8, (void*)&address, 16);
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}
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void IPv6Packet::setDstAddress(IPv6Addr& address) {
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memcpy(packet + 24, (void*)&address, 16);
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}
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void IPv6Packet::setPayload(char* payload, uint8_t len) {
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memset(packet, 0, LEN);
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ipv6_packet_header* header = (ipv6_packet_header*)packet;
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memcpy(header->field, "\x60\x00\x00\x00", 4);
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memcpy(header->len + 1, (char*)&len, 1);
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header->hop_limit = 64;
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memcpy(packet + sizeof(ipv6_packet_header), payload, len);
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}
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void IPv6Packet::doAction() {
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/* if destination is my address, or destination is "all nodes" address, then... */
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if ((memcmp(&(ALL_NODES_ADDRESS), packet + 24, 16) == 0) || (memcmp(&(coppino::address), packet + 24, 16) == 0)) {
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int len = ((*(packet + 4)) << 8) + (*(packet + 5));
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switch(*(packet + 6)) { /* next header */
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case 58:
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handleICMP(packet + 8, packet + 24, packet + 40, len);
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break;
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case 17:
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// handleUDP(packet + 40, len);
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break;
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default:
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/* no other protocols are known here, sorry :-) */
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break;
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}
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}
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}
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void handleICMP(const char* src_addr, const char* dst_addr, char* packet, int len) {
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uint8_t type = *(packet);
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uint32_t checksum = ((*(packet + 2)) << 8) + (*(packet + 3));
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uint16_t part;
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IPv6Addr dst;
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int i;
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switch (type) {
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case 128:
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/* TODO compute checksum, and assert validity of incoming message */
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/* then... */
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/* Build an echo reply:
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* the reply has the same exact format of the request,
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* except for Type and Checksum */
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*(packet) = 129; /* echo reply type */
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*(packet + 2) = *(packet + 3) = 0; /* zero-checksum */
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checksum = coppino::compute_checksum(src_addr, dst_addr, 58, packet, len);
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memcpy(packet + 2, &checksum, 2);
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IPv6Packet reply_packet;
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reply_packet.setPayload(packet, len);
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reply_packet.setSrcAddress(coppino::address);
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dst.deserialize(src_addr);
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reply_packet.setDstAddress(dst);
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reply_packet.setNextHeader(58); // ICMPv6
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slip::send((void*)&reply_packet, 40 + len);
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break;
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default:
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/* no other types have been implemented */
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break;
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}
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return;
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}
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}
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