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#include <stdlib.h>
#include <string.h>
#include <netinet/ip6.h>
#include <linux/if_ether.h>
#include "proto.h"
#include <libnetfilter_conntrack/libnetfilter_conntrack.h>
static void
l3_ipv6_ct_build_tuple(const uint8_t *pkt, struct nf_conntrack *ct)
{
const struct ip6_hdr *ip6h = (const struct ip6_hdr *)pkt;
nfct_set_attr_u16(ct, ATTR_ORIG_L3PROTO, AF_INET6);
nfct_set_attr_u16(ct, ATTR_REPL_L3PROTO, AF_INET6);
nfct_set_attr(ct, ATTR_ORIG_IPV6_SRC, &ip6h->ip6_src);
nfct_set_attr(ct, ATTR_ORIG_IPV6_DST, &ip6h->ip6_dst);
nfct_set_attr(ct, ATTR_REPL_IPV6_SRC, &ip6h->ip6_src);
nfct_set_attr(ct, ATTR_REPL_IPV6_DST, &ip6h->ip6_dst);
}
static int
l3_ipv6_ct_cmp_tuple_orig(const uint8_t *pkt, struct nf_conntrack *ct)
{
const struct ip6_hdr *ip6h = (const struct ip6_hdr *)pkt;
if (memcmp(&ip6h->ip6_src, nfct_get_attr(ct, ATTR_ORIG_IPV6_SRC),
sizeof(struct in6_addr)) == 0 &&
memcmp(&ip6h->ip6_dst, nfct_get_attr(ct, ATTR_ORIG_IPV6_DST),
sizeof(struct in6_addr)) == 0)
return 1;
return 0;
}
static int
l3_ipv6_ct_cmp_tuple_repl(const uint8_t *pkt, struct nf_conntrack *ct)
{
const struct ip6_hdr *ip6h = (const struct ip6_hdr *)pkt;
if (memcmp(&ip6h->ip6_src, nfct_get_attr(ct, ATTR_REPL_IPV6_SRC),
sizeof(struct in6_addr)) == 0 &&
memcmp(&ip6h->ip6_dst, nfct_get_attr(ct, ATTR_REPL_IPV6_DST),
sizeof(struct in6_addr)) == 0)
return 1;
return 0;
}
static int l3_ipv6_pkt_l4proto_num(const uint8_t *pkt)
{
const struct ip6_hdr *ip6h = (const struct ip6_hdr *)pkt;
return ip6h->ip6_nxt;
}
static int l3_ipv6_pkt_l3hdr_len(const uint8_t *pkt)
{
return sizeof(struct ip6_hdr);
}
static struct cthelper_proto_l2l3_helper ipv4 = {
.l2protonum = ETH_P_IPV6,
.l3protonum = AF_INET6,
.l2hdr_len = ETH_HLEN,
.l3ct_build = l3_ipv6_ct_build_tuple,
.l3ct_cmp_orig = l3_ipv6_ct_cmp_tuple_orig,
.l3ct_cmp_repl = l3_ipv6_ct_cmp_tuple_repl,
.l3pkt_hdr_len = l3_ipv6_pkt_l3hdr_len,
.l4pkt_proto = l3_ipv6_pkt_l4proto_num,
};
void l2l3_ipv6_init(void)
{
cthelper_proto_l2l3_helper_register(&ipv4);
}
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