ipv6: format
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406
src/ipv6.cpp
406
src/ipv6.cpp
@ -1,158 +1,190 @@
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#include "ipv6.h"
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#include "udp.h"
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namespace ipv6 {
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/******** costants ********/
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const IPv6Addr ALL_NODES_ADDRESS("\xff\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01"); /* ff02::1 */
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namespace ipv6
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{
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/******** costants ********/
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const IPv6Addr ALL_NODES_ADDRESS("\xff\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01"); /* ff02::1 */
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/******** variables ********/
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uint8_t HOP_LIMIT = 64;
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IPv6Addr LINK_LOCAL_ADDRESS;
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IPv6Addr GLOBAL_ADDRESS;
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bool slaac_enable;
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/******** variables ********/
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uint8_t HOP_LIMIT = 64;
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IPv6Addr LINK_LOCAL_ADDRESS;
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IPv6Addr GLOBAL_ADDRESS;
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bool slaac_enable;
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/******** buffers ********/
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IPv6Packet packetin;
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IPv6Packet packetout;
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/******** buffers ********/
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IPv6Packet packetin;
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IPv6Packet packetout;
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/******** FUNCTIONS *******/
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void setEUI(const char* eui) {
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memset(&LINK_LOCAL_ADDRESS, 0, 16);
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memcpy(&LINK_LOCAL_ADDRESS, "\xfe\x80", 2);
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memcpy( ((char*)&LINK_LOCAL_ADDRESS) + 8 , eui, 8);
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}
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void SLAAC(bool enable) {
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slaac_enable = enable;
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}
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void setGlobalAddress(const char* address) {
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memcpy(&GLOBAL_ADDRESS, address, 16);
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}
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uint16_t compute_checksum(const IPv6Addr* src_addr, const IPv6Addr* dst_addr, uint8_t next_header, int upper_len, const char* payload, int len) {
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char buffer[LEN];
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uint32_t total;
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uint16_t* ptr;
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int words;
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int i = len;
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/* prepare buffer with all data to checksum:
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- the actual payload
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- the pseudo ipv6 header
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*/
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/* actual payload */
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memcpy(buffer, payload, len);
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if (len % 2) { /* pad with 0 if length is odd */
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buffer[len] = 0;
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i++;
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/******** FUNCTIONS *******/
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void setEUI(const char *eui)
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{
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memset(&LINK_LOCAL_ADDRESS, 0, 16);
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memcpy(&LINK_LOCAL_ADDRESS, "\xfe\x80", 2);
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memcpy(((char *)&LINK_LOCAL_ADDRESS) + 8, eui, 8);
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}
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/* pseudo ipv6 header -- see RFC 2460, Section 8.1 */
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memcpy(buffer + i, src_addr, 16); i += 16;
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memcpy(buffer + i, dst_addr, 16); i += 16;
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memset(buffer + i, 0, 3); i+= 3; /* first 3 bytes always 0, because len always < 256 */
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buffer[i] = upper_len & 0xff; i += 1;
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memset(buffer + i, 0, 3); i += 3; /* zero, as per-standard */
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buffer[i] = next_header; i += 1;
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/* do computation */
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total = 0;
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ptr = (uint16_t*)buffer;
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words = (i + 1) / 2;
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while (words--) total += *ptr++;
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while (total & 0xffff0000) {
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total = (total >> 16) + (total & 0xffff);
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void SLAAC(bool enable)
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{
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slaac_enable = enable;
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}
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void setGlobalAddress(const char *address)
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{
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memcpy(&GLOBAL_ADDRESS, address, 16);
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}
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return ~((uint16_t) total);
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}
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uint16_t compute_checksum(const IPv6Addr *src_addr, const IPv6Addr *dst_addr, uint8_t next_header, int upper_len, const char *payload, int len)
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{
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char buffer[LEN];
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uint32_t total;
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uint16_t *ptr;
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int words;
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int i = len;
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/******** IPv6Addr ********/
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IPv6Addr::IPv6Addr() {;}
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/* prepare buffer with all data to checksum:
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- the actual payload
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- the pseudo ipv6 header
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*/
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/* actual payload */
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memcpy(buffer, payload, len);
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if (len % 2)
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{ /* pad with 0 if length is odd */
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buffer[len] = 0;
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i++;
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}
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/* pseudo ipv6 header -- see RFC 2460, Section 8.1 */
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memcpy(buffer + i, src_addr, 16);
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i += 16;
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memcpy(buffer + i, dst_addr, 16);
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i += 16;
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memset(buffer + i, 0, 3);
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i += 3; /* first 3 bytes always 0, because len always < 256 */
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buffer[i] = upper_len & 0xff;
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i += 1;
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memset(buffer + i, 0, 3);
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i += 3; /* zero, as per-standard */
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buffer[i] = next_header;
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i += 1;
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IPv6Addr::IPv6Addr(const char* address) {
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memcpy(this->address, address, 16);
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}
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/* do computation */
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total = 0;
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ptr = (uint16_t *)buffer;
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words = (i + 1) / 2;
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/******** IPv6Packet ********/
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IPv6Packet::IPv6Packet() {
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memset(packet, 0, LEN);
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*(packet) = 0x60; /* IP version 6 */
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*(packet + 7) = HOP_LIMIT; /* hop limit / ttl */
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}
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while (words--)
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total += *ptr++;
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IPv6Packet::IPv6Packet(const char* buffer, int len) {
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memcpy(this->packet, buffer, len);
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}
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while (total & 0xffff0000)
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{
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total = (total >> 16) + (total & 0xffff);
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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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return ~((uint16_t)total);
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}
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void IPv6Packet::setLen(int len) {
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*(packet + 4) = len >> 8;
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*(packet + 5) = len & 0xff;
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}
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int IPv6Packet::getLen() {
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return ((*(packet + 4)) << 8) + (*(packet + 5));
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}
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/******** IPv6Addr ********/
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IPv6Addr::IPv6Addr() { ; }
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void IPv6Packet::setSrcAddress(const IPv6Addr* address) {
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memcpy(packet + 8, address, 16);
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}
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void IPv6Packet::setDstAddress(const IPv6Addr* address) {
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memcpy(packet + 24, address, 16);
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}
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IPv6Addr::IPv6Addr(const char *address)
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{
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memcpy(this->address, address, 16);
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}
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const IPv6Addr* IPv6Packet::getSrcAddress() {
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return (const IPv6Addr*) (packet + 8);
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}
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const IPv6Addr* IPv6Packet::getDstAddress() {
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return (const IPv6Addr*) (packet + 24);
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}
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/******** IPv6Packet ********/
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IPv6Packet::IPv6Packet()
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{
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memset(packet, 0, LEN);
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*(packet) = 0x60; /* IP version 6 */
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*(packet + 7) = HOP_LIMIT; /* hop limit / ttl */
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}
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void IPv6Packet::setFlow(const char* flow) {
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/* three bytes
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4 most significant bits are ignored
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because only 20 bits can be used */
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*(packet + 1) = (*(packet + 1)) | (flow[0] & 0x0f); /* pay attention to TC field */
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memcpy(packet + 2, flow + 1, 2);
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}
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IPv6Packet::IPv6Packet(const char *buffer, int len)
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{
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memcpy(this->packet, buffer, len);
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}
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void IPv6Packet::setPayload(char* payload, int len) {
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*(packet + 4 + 0) = len >> 8;
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*(packet + 4 + 1) = len & 0xff;
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memcpy(packet + 40, payload, len); /* payload */
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}
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void IPv6Packet::setNextHeader(uint8_t next_header)
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{
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*(packet + 6) = next_header;
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}
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void IPv6Packet::send() {
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slip::send(packet, 40 + this->getLen());
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}
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void IPv6Packet::setLen(int len)
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{
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*(packet + 4) = len >> 8;
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*(packet + 5) = len & 0xff;
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}
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int IPv6Packet::getLen()
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{
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return ((*(packet + 4)) << 8) + (*(packet + 5));
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}
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void IPv6Packet::doAction() {
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/* if destination is my address (global or link-local), or destination is "all nodes" address, then... */
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if (
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(memcmp(&(ALL_NODES_ADDRESS), packet + 24, 16) == 0) ||
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(memcmp(&(LINK_LOCAL_ADDRESS), packet + 24, 16) == 0) ||
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(memcmp(&(GLOBAL_ADDRESS), packet + 24, 16) == 0)) {
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int ilen = this->getLen(); /* input payload length */
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int olen; /* output payload length */
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switch(*(packet + 6)) { /* next header */
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void IPv6Packet::setSrcAddress(const IPv6Addr *address)
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{
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memcpy(packet + 8, address, 16);
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}
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void IPv6Packet::setDstAddress(const IPv6Addr *address)
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{
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memcpy(packet + 24, address, 16);
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}
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const IPv6Addr *IPv6Packet::getSrcAddress()
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{
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return (const IPv6Addr *)(packet + 8);
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}
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const IPv6Addr *IPv6Packet::getDstAddress()
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{
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return (const IPv6Addr *)(packet + 24);
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}
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void IPv6Packet::setFlow(const char *flow)
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{
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/* three bytes
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4 most significant bits are ignored
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because only 20 bits can be used */
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*(packet + 1) = (*(packet + 1)) | (flow[0] & 0x0f); /* pay attention to TC field */
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memcpy(packet + 2, flow + 1, 2);
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}
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void IPv6Packet::setPayload(char *payload, int len)
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{
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*(packet + 4 + 0) = len >> 8;
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*(packet + 4 + 1) = len & 0xff;
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memcpy(packet + 40, payload, len); /* payload */
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}
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void IPv6Packet::send()
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{
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slip::send(packet, 40 + this->getLen());
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}
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void IPv6Packet::doAction()
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{
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/* if destination is my address (global or link-local), or destination is "all nodes" address, then... */
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if (
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(memcmp(&(ALL_NODES_ADDRESS), packet + 24, 16) == 0) ||
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(memcmp(&(LINK_LOCAL_ADDRESS), packet + 24, 16) == 0) ||
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(memcmp(&(GLOBAL_ADDRESS), packet + 24, 16) == 0))
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{
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int ilen = this->getLen(); /* input payload length */
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int olen; /* output payload length */
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switch (*(packet + 6))
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{ /* next header */
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case NH_ICMP:
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if ((olen = handleICMP((char*)&packetout + 40, packet + 40, ilen)) != -1) {
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if ((olen = handleICMP((char *)&packetout + 40, packet + 40, ilen)) != -1)
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{
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packetout.setLen(olen);
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packetout.setFlow(((char*)(&packetin)) + 1);
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packetout.setFlow(((char *)(&packetin)) + 1);
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packetout.setSrcAddress(packetin.getDstAddress());
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packetout.setDstAddress(packetin.getSrcAddress());
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packetout.setNextHeader(NH_ICMP);
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packetout.send();
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}
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}
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break;
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case NH_UDP:
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if ((olen = udp::handleUDP((char*)&packetout + 40, packet + 40, ilen)) != -1) {
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if ((olen = udp::handleUDP((char *)&packetout + 40, packet + 40, ilen)) != -1)
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{
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packetout.setLen(olen);
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packetout.setFlow(((char*)(&packetin)) + 1);
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packetout.setFlow(((char *)(&packetin)) + 1);
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packetout.setSrcAddress(packetin.getDstAddress());
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packetout.setDstAddress(packetin.getSrcAddress());
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packetout.setNextHeader(NH_UDP);
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@ -162,72 +194,80 @@ void IPv6Packet::doAction() {
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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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} /* ...else discard packet */
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}
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/* handles ICMP and (possibly) generate a reply
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* returns length of generated packet (written to output_buffer), or -1 if there is no reply packet
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*/
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int handleICMP(char* output_buffer, const char* input_buffer, int len) {
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uint8_t type = *(input_buffer);
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/* compute checksum, and assert validity of incoming message */
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char received_checksum[2];
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memcpy(received_checksum, input_buffer + 2, 2);
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memcpy(output_buffer, input_buffer, len);
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memset(output_buffer + 2, 0, 2); /* zero-checksum */
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uint16_t computed_checksum = compute_checksum(
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packetin.getSrcAddress(),
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packetin.getDstAddress(),
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NH_ICMP,
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len,
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output_buffer,
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len);
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if (memcmp(&computed_checksum, received_checksum, 2) != 0) { /* if checksum is not valid, return */
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return -1;
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}
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} /* ...else discard packet */
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}
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if (type == ICMP_ECHO_REQUEST_TYPE) { /* if it is ICMPv6 Echo Request, 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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*(output_buffer) = ICMP_ECHO_REPLY_TYPE;
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memset(output_buffer + 2, 0, 2); /* zero-checksum */
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/* handles ICMP and (possibly) generate a reply
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* returns length of generated packet (written to output_buffer), or -1 if there is no reply packet
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*/
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int handleICMP(char *output_buffer, const char *input_buffer, int len)
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{
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uint8_t type = *(input_buffer);
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uint16_t checksum = compute_checksum(
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packetin.getDstAddress(),
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packetin.getSrcAddress(),
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NH_ICMP,
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len,
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output_buffer,
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len);
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memcpy(output_buffer + 2, &checksum, 2);
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return len;
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} else if (type == ICMP_RADV_TYPE && slaac_enable) { /* if it is IVMPc6 Router Advertisement, then... */
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ICMPv6_RADV* radv = (ICMPv6_RADV*)input_buffer;
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HOP_LIMIT = (radv->cur_hop_limit != 0) ? radv->cur_hop_limit : 64;
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for (
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ICMPv6_RADV_Option* option = (ICMPv6_RADV_Option*) (radv + 1);
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option != input_buffer + len;
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option = (ICMPv6_RADV_Option*) ( ((char*)(option)) + option->len )) {
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if (option->type == 3 && option->len == 4) { /* if it is a ICMPv6 Prefix Information, then... */
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ICMPv6_RADV_PrefixInformation* p = (ICMPv6_RADV_PrefixInformation*) option;
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if (p->prefix_length != 64) continue; /* only /64 prefix is supported */
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if (! (p->la_flags & 0x40)) continue; /* only SLAAC is supported */
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/* compute checksum, and assert validity of incoming message */
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char received_checksum[2];
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memcpy(received_checksum, input_buffer + 2, 2);
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memcpy(output_buffer, input_buffer, len);
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memset(output_buffer + 2, 0, 2); /* zero-checksum */
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uint16_t computed_checksum = compute_checksum(
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packetin.getSrcAddress(),
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packetin.getDstAddress(),
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NH_ICMP,
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len,
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output_buffer,
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len);
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if (memcmp(&computed_checksum, received_checksum, 2) != 0)
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{ /* if checksum is not valid, return */
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return -1;
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}
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if (type == ICMP_ECHO_REQUEST_TYPE)
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{ /* if it is ICMPv6 Echo Request, 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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*(output_buffer) = ICMP_ECHO_REPLY_TYPE;
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memset(output_buffer + 2, 0, 2); /* zero-checksum */
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uint16_t checksum = compute_checksum(
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packetin.getDstAddress(),
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packetin.getSrcAddress(),
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NH_ICMP,
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len,
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output_buffer,
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len);
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memcpy(output_buffer + 2, &checksum, 2);
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return len;
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}
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else if (type == ICMP_RADV_TYPE && slaac_enable)
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{ /* if it is IVMPc6 Router Advertisement, then... */
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ICMPv6_RADV *radv = (ICMPv6_RADV *)input_buffer;
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HOP_LIMIT = (radv->cur_hop_limit != 0) ? radv->cur_hop_limit : 64;
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for (
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ICMPv6_RADV_Option *option = (ICMPv6_RADV_Option *)(radv + 1);
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option != input_buffer + len;
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option = (ICMPv6_RADV_Option *)(((char *)(option)) + option->len))
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{
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if (option->type == 3 && option->len == 4)
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{ /* if it is a ICMPv6 Prefix Information, then... */
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ICMPv6_RADV_PrefixInformation *p = (ICMPv6_RADV_PrefixInformation *)option;
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if (p->prefix_length != 64)
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continue; /* only /64 prefix is supported */
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if (!(p->la_flags & 0x40))
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continue; /* only SLAAC is supported */
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memcpy(&GLOBAL_ADDRESS, p->prefix, 8); /* set prefix -- leave host bits unchanged */
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break;
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}
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}
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return -1;
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}
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return -1;
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}
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return -1;
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}
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}
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90
src/ipv6.h
90
src/ipv6.h
@ -4,47 +4,52 @@
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#include "Arduino.h"
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#include "slip.h"
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namespace ipv6 {
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namespace ipv6
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{
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/* maximum length for an IPv6 packet */
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const uint8_t LEN = 128;
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/* ICMP Types */
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const uint8_t ICMP_ECHO_REQUEST_TYPE = 128;
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const uint8_t ICMP_ECHO_REPLY_TYPE = 129;
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const uint8_t ICMP_RADV_TYPE = 134;
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const uint8_t ICMP_ECHO_REPLY_TYPE = 129;
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const uint8_t ICMP_RADV_TYPE = 134;
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/* Next-Header Types */
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const uint8_t NH_ICMP = 58;
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const uint8_t NH_UDP = 17;
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const uint8_t NH_UDP = 17;
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class IPv6Addr {
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private:
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char address[16];
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public:
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IPv6Addr();
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IPv6Addr(const char* address);
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class IPv6Addr
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{
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private:
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char address[16];
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public:
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IPv6Addr();
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IPv6Addr(const char *address);
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};
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extern const IPv6Addr ALL_NODES_ADDRESS;
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class IPv6Packet {
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private:
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char packet[LEN];
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public:
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IPv6Packet();
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IPv6Packet(const char* buffer, int len);
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void setLen(int len);
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int getLen();
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void setSrcAddress(const IPv6Addr* address);
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const IPv6Addr* getSrcAddress();
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void setDstAddress(const IPv6Addr* address);
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const IPv6Addr* getDstAddress();
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void setNextHeader(uint8_t next_header);
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void setFlow(const char* flow);
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void setPayload(char* payload, int len);
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void send();
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class IPv6Packet
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{
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private:
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char packet[LEN];
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void doAction();
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public:
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IPv6Packet();
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IPv6Packet(const char *buffer, int len);
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void setLen(int len);
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int getLen();
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void setSrcAddress(const IPv6Addr *address);
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const IPv6Addr *getSrcAddress();
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void setDstAddress(const IPv6Addr *address);
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const IPv6Addr *getDstAddress();
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void setNextHeader(uint8_t next_header);
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void setFlow(const char *flow);
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void setPayload(char *payload, int len);
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void send();
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void doAction();
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};
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/* incoming and outgoing packets buffer */
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@ -52,20 +57,21 @@ namespace ipv6 {
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extern IPv6Packet packetout;
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/* Note: content of message may be changed */
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int handleICMP(char* output_buffer, const char* input_buffer, int len);
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int handleICMP(char *output_buffer, const char *input_buffer, int len);
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/* Compute internet checksum. Actually it is not so straightforward: */
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uint16_t compute_checksum(
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const IPv6Addr* src_addr, /* source IPv6 address */
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const IPv6Addr* dst_addr, /* destination IPv6 address */
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uint8_t next_header, /* IPv6 next header number */
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int upper_len, /* length as found in the upper layer protocol */
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const char* payload, /* IPv6 payload */
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int len /* IPv6 payload length */
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);
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const IPv6Addr *src_addr, /* source IPv6 address */
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const IPv6Addr *dst_addr, /* destination IPv6 address */
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uint8_t next_header, /* IPv6 next header number */
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int upper_len, /* length as found in the upper layer protocol */
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const char *payload, /* IPv6 payload */
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int len /* IPv6 payload length */
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);
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/* RFC 4861 -- begin */
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struct ICMPv6_RADV {
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struct ICMPv6_RADV
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{
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uint8_t type;
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uint8_t code;
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char checksum[2];
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@ -76,12 +82,14 @@ namespace ipv6 {
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uint32_t retrans_time;
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};
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struct ICMPv6_RADV_Option {
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struct ICMPv6_RADV_Option
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{
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uint8_t type;
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uint8_t len;
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};
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struct ICMPv6_RADV_PrefixInformation {
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struct ICMPv6_RADV_PrefixInformation
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{
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uint8_t type;
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uint8_t len;
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uint8_t prefix_length;
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@ -93,9 +101,9 @@ namespace ipv6 {
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};
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/* RFC 4861 -- end */
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void setEUI(const char* eui); /* 64bit Extended Unique Identifier */
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void SLAAC(bool enable); /* enable IPv6 automatic prefix configuration (listens for RADV) */
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void setGlobalAddress(const char* address); /* global IPv6 address, manually configured */
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void setEUI(const char *eui); /* 64bit Extended Unique Identifier */
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void SLAAC(bool enable); /* enable IPv6 automatic prefix configuration (listens for RADV) */
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void setGlobalAddress(const char *address); /* global IPv6 address, manually configured */
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}
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#endif
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