mirror of
https://github.com/oliverschmidt/contiki.git
synced 2024-12-22 10:30:13 +00:00
263 lines
6.5 KiB
C
263 lines
6.5 KiB
C
|
|
#define NETSTACK_CONF_WITH_IPV6 1
|
|
#define UIP_CONF_LL_802154 1
|
|
|
|
#include <string.h>
|
|
|
|
#define DEBUG DEBUG_NONE
|
|
|
|
#include "net/ip/uip-debug.h"
|
|
|
|
#include "ip-process.h"
|
|
|
|
#include <stdio.h>
|
|
|
|
#undef uip_buf
|
|
extern unsigned char *uip_buf;
|
|
extern uint16_t uip_len;
|
|
|
|
|
|
#define UIP_IP_BUF ((struct uip_ip_hdr *)&uip_buf[UIP_LLH_LEN])
|
|
|
|
|
|
uint8_t mac_createEthernetAddr(uint8_t * ethernet, uip_lladdr_t * lowpan);
|
|
int8_t mac_translateIcmpLinkLayer();
|
|
int8_t mac_translateIPLinkLayer();
|
|
|
|
|
|
/**
|
|
* \brief Translate IP packet's possible link-layer addresses, passing
|
|
* the message to the appropriate higher level function for this
|
|
* packet (aka: ICMP)
|
|
* \param target The target we want to end up with - either ll_8023_type
|
|
* for ethernet, or ll_802154_type for 802.15.4
|
|
* \return Returns how successful the translation was
|
|
* \retval 0 Addresses, if present, were translated.
|
|
* \retval <0 Negative return values indicate various errors, as defined
|
|
* by the higher level function.
|
|
*/
|
|
int8_t mac_translateIPLinkLayer()
|
|
{
|
|
|
|
if (UIP_IP_BUF->proto == UIP_PROTO_ICMP6) {
|
|
PRINTF("eth2low: ICMP Message detected\n");
|
|
return mac_translateIcmpLinkLayer();
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
#include "net/ipv6/uip-icmp6.h"
|
|
#include "net/ipv6/uip-nd6.h"
|
|
|
|
typedef struct {
|
|
uint8_t type;
|
|
uint8_t length;
|
|
uint8_t data[16];
|
|
} icmp_opts_t;
|
|
|
|
#define UIP_ICMP_BUF ((struct uip_icmp_hdr *)&uip_buf[UIP_LLH_LEN + UIP_IPH_LEN])
|
|
#define UIP_ICMP_OPTS(x) ((icmp_opts_t *)&uip_buf[UIP_LLH_LEN + UIP_IPH_LEN + x])
|
|
|
|
void slide(uint8_t * data, uint8_t length, int16_t slide);
|
|
|
|
/**
|
|
* \brief Translate the link-layer (L2) addresses in an ICMP packet.
|
|
* This will just be NA/NS/RA/RS packets currently.
|
|
* \param target The target we want to end up with - either ll_8023_type
|
|
* for ethernet, or ll_802154_type for 802.15.4
|
|
* \return Returns how successful the translation was
|
|
* \retval 0 Addresses, if present, were translated.
|
|
* \retval -1 ICMP message was unknown type, nothing done.
|
|
* \retval -2 ICMP Length does not make sense?
|
|
* \retval -3 Unknown 'target' type
|
|
*/
|
|
int8_t mac_translateIcmpLinkLayer()
|
|
{
|
|
uint16_t icmp_opt_offset = 0;
|
|
int16_t len = UIP_IP_BUF->len[1] | (UIP_IP_BUF->len[0] << 8);
|
|
|
|
uint16_t iplen;
|
|
|
|
uint8_t i;
|
|
|
|
int16_t sizechange;
|
|
|
|
uint8_t llbuf[16];
|
|
|
|
//Figure out offset to start of options
|
|
switch(UIP_ICMP_BUF->type) {
|
|
case ICMP6_NS:
|
|
case ICMP6_NA:
|
|
icmp_opt_offset = 24;
|
|
break;
|
|
|
|
case ICMP6_RS:
|
|
icmp_opt_offset = 8;
|
|
break;
|
|
|
|
case ICMP6_RA:
|
|
icmp_opt_offset = 16;
|
|
break;
|
|
|
|
case ICMP6_REDIRECT:
|
|
icmp_opt_offset = 40;
|
|
break;
|
|
|
|
/** Things without link-layer */
|
|
case ICMP6_DST_UNREACH:
|
|
case ICMP6_PACKET_TOO_BIG:
|
|
case ICMP6_TIME_EXCEEDED:
|
|
case ICMP6_PARAM_PROB:
|
|
case ICMP6_ECHO_REQUEST:
|
|
case ICMP6_ECHO_REPLY:
|
|
return 0;
|
|
break;
|
|
|
|
default:
|
|
return -1;
|
|
}
|
|
|
|
//Figure out length of options
|
|
len -= icmp_opt_offset;
|
|
|
|
//Sanity check
|
|
if (len < 8) return -2;
|
|
|
|
//While we have options to do...
|
|
while (len >= 8){
|
|
|
|
//If we have one of these, we have something useful!
|
|
if (((UIP_ICMP_OPTS(icmp_opt_offset)->type) == UIP_ND6_OPT_SLLAO) ||
|
|
((UIP_ICMP_OPTS(icmp_opt_offset)->type) == UIP_ND6_OPT_TLLAO) ) {
|
|
|
|
/* Shrinking the buffer may thrash things, so we store the old
|
|
link-layer address */
|
|
for(i = 0; i < (UIP_ICMP_OPTS(icmp_opt_offset)->length*8 - 2); i++) {
|
|
llbuf[i] = UIP_ICMP_OPTS(icmp_opt_offset)->data[i];
|
|
}
|
|
|
|
|
|
//Shrink/grow buffer as needed
|
|
/* Current is 802.15.4, Hence current link-layer option is 14 extra
|
|
* bytes.
|
|
* (Actual LL is 8 bytes, but total option length is in multiples of
|
|
* 8 Bytes, hence 8 + 2 = 10. Closest is 16 bytes, then 16 bytes for
|
|
* total optional length - 2 bytes for type + length leaves 14 )
|
|
*/
|
|
sizechange = -8;
|
|
slide(UIP_ICMP_OPTS(icmp_opt_offset)->data + 14, len - 14, sizechange);
|
|
|
|
|
|
mac_createEthernetAddr(UIP_ICMP_OPTS(icmp_opt_offset)->data, (uip_lladdr_t *)llbuf);
|
|
|
|
//Adjust the length
|
|
UIP_ICMP_OPTS(icmp_opt_offset)->length = 1;
|
|
|
|
//Adjust the IP header length, as well as uIP length
|
|
iplen = UIP_IP_BUF->len[1] | (UIP_IP_BUF->len[0]<<8);
|
|
iplen += sizechange;
|
|
len += sizechange;
|
|
|
|
UIP_IP_BUF->len[1] = (uint8_t)iplen;
|
|
UIP_IP_BUF->len[0] = (uint8_t)(iplen >> 8);
|
|
|
|
uip_len += sizechange;
|
|
|
|
//We broke ICMP checksum, be sure to fix that
|
|
UIP_ICMP_BUF->icmpchksum = 0;
|
|
UIP_ICMP_BUF->icmpchksum = ~uip_icmp6chksum();
|
|
|
|
//Finally set up next run in while loop
|
|
len -= 8 * UIP_ICMP_OPTS(icmp_opt_offset)->length;
|
|
icmp_opt_offset += 8 * UIP_ICMP_OPTS(icmp_opt_offset)->length;
|
|
} else {
|
|
|
|
//Not an option we care about, ignore it
|
|
len -= 8 * UIP_ICMP_OPTS(icmp_opt_offset)->length;
|
|
|
|
//This shouldn't happen!
|
|
if (UIP_ICMP_OPTS(icmp_opt_offset)->length == 0) {
|
|
PRINTF("Option in ND packet has length zero, error?\n");
|
|
len = 0;
|
|
}
|
|
|
|
icmp_opt_offset += 8 * UIP_ICMP_OPTS(icmp_opt_offset)->length;
|
|
|
|
} //If ICMP_OPT is one we care about
|
|
|
|
} //while(len >= 8)
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
/**
|
|
* \brief Create a 802.3 address from a 802.15.4 long address
|
|
* \param ethernet Pointer to ethernet address
|
|
* \param lowpan Pointer to 802.15.4 address
|
|
*/
|
|
uint8_t mac_createEthernetAddr(uint8_t * ethernet, uip_lladdr_t * lowpan)
|
|
{
|
|
/* uint8_t j, match; */
|
|
|
|
uint8_t tmp[8];
|
|
|
|
memcpy(tmp,lowpan,sizeof(uip_lladdr_t));
|
|
|
|
memcpy(ethernet, tmp, 3);
|
|
memcpy(ethernet+3, tmp+5, 3);
|
|
ethernet[0] |= 0x02;
|
|
|
|
return 1;
|
|
}
|
|
|
|
/**
|
|
* \brief Slide the pointed to memory up a certain amount,
|
|
* growing/shrinking a buffer
|
|
* \param data Pointer to start of data buffer
|
|
* \param length Length of the data buffer
|
|
* \param slide How many bytes to slide the buffer up in memory (if +) or
|
|
* down in memory (if -)
|
|
*/
|
|
void slide(uint8_t * data, uint8_t length, int16_t slide)
|
|
{
|
|
//Sanity checks
|
|
if (!length) return;
|
|
if (!slide) return;
|
|
|
|
uint8_t i = 0;
|
|
|
|
while(length) {
|
|
length--;
|
|
|
|
//If we are sliding up, we do from the top of the buffer down
|
|
if (slide > 0) {
|
|
*(data + length + slide) = *(data + length);
|
|
|
|
//If we are sliding down, we do from the bottom of the buffer up
|
|
} else {
|
|
*(data + slide + i) = *(data + i);
|
|
}
|
|
|
|
i++;
|
|
}
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
uint16_t ip_process(unsigned char *buf, unsigned int len)
|
|
{
|
|
uip_buf = buf;
|
|
uip_len = len;
|
|
|
|
mac_translateIPLinkLayer();
|
|
|
|
return uip_len;
|
|
|
|
}
|
|
|
|
|
|
|