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Added support for DNS64 translation of DNS queries for IPv6 addresses to IPv4 addresses, and the translation of responses from IPv4 to IPv6

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This commit is contained in:
Adam Dunkels 2015-03-24 11:56:14 +01:00
parent 251813a6dd
commit 269188846c
3 changed files with 329 additions and 3 deletions
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33
core/net/ip64/ip64.c
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@ -59,7 +59,8 @@
#include "ip64-special-ports.h"
#include "ip64-eth-interface.h"
#include "ip64-slip-interface.h"
#include "ip64-dns64.h"
#include "net/ipv6/uip-ds6.h"
#include "ip64-ipv4-dhcp.h"
#include "contiki-net.h"
@ -173,6 +174,8 @@ static uip_ip4addr_t ipv4_broadcast_addr;
#define TCP_SYN 0x02
#define TCP_RST 0x04
#define DNS_PORT 53
/*---------------------------------------------------------------------------*/
void
ip64_init(void)
@ -367,7 +370,7 @@ ip64_6to4(const uint8_t *ipv6packet, const uint16_t ipv6packet_len,
struct icmpv6_hdr *icmpv6hdr;
uint16_t ipv6len, ipv4len;
struct ip64_addrmap_entry *m;
v6hdr = (struct ipv6_hdr *)ipv6packet;
v4hdr = (struct ipv4_hdr *)resultpacket;
@ -435,6 +438,15 @@ ip64_6to4(const uint8_t *ipv6packet, const uint16_t ipv6packet_len,
case IP_PROTO_UDP:
PRINTF("ip64_6to4: UDP header\n");
v4hdr->proto = IP_PROTO_UDP;
/* Check if this is a DNS request. If so, we should rewrite it
with the DNS64 module. */
if(udphdr->destport == UIP_HTONS(DNS_PORT)) {
ip64_dns64_6to4((uint8_t *)v6hdr + IPV6_HDRLEN + sizeof(struct udp_hdr),
ipv6len - IPV6_HDRLEN - sizeof(struct udp_hdr),
(uint8_t *)udphdr + sizeof(struct udp_hdr),
BUFSIZE - IPV4_HDRLEN - sizeof(struct udp_hdr));
}
/* Compute and check the UDP checksum - since we're going to
recompute it ourselves, we must ensure that it was correct in
the first place. */
@ -575,7 +587,7 @@ ip64_6to4(const uint8_t *ipv6packet, const uint16_t ipv6packet_len,
/* Treat DNS requests specially: since the are one-shot, we
mark them as recyclable. */
if(udphdr->destport == UIP_HTONS(53)) {
if(udphdr->destport == UIP_HTONS(DNS_PORT)) {
ip64_addrmap_set_recycleble(m);
}
}
@ -707,6 +719,21 @@ ip64_4to6(const uint8_t *ipv4packet, const uint16_t ipv4packet_len,
switch(v4hdr->proto) {
case IP_PROTO_UDP:
v6hdr->nxthdr = IP_PROTO_UDP;
/* Check if this is a DNS request. If so, we should rewrite it
with the DNS64 module. */
if(udphdr->srcport == UIP_HTONS(DNS_PORT)) {
int len;
len = ip64_dns64_4to6((uint8_t *)v4hdr + IPV4_HDRLEN + sizeof(struct udp_hdr),
ipv4len - IPV4_HDRLEN - sizeof(struct udp_hdr),
(uint8_t *)v6hdr + IPV6_HDRLEN + sizeof(struct udp_hdr),
ipv6_packet_len - sizeof(struct udp_hdr));
ipv6_packet_len = len + sizeof(struct udp_hdr);
v6hdr->len[0] = ipv6_packet_len >> 8;
v6hdr->len[1] = ipv6_packet_len & 0xff;
ipv6len = ipv6_packet_len + IPV6_HDRLEN;
}
break;
case IP_PROTO_TCP: