bool test_addr_6to4(struct in6_addr *src, struct ipv6_prefix *prefix, struct in_addr *expected)
{
struct in_addr actual;
bool success = true;
success &= assert_true(addr_6to4(src, prefix, &actual), "Extract IPv4-result");
success &= assert_equals_ipv4(expected, &actual, "Extract IPv4-out");
return success;
}
/**
* Assumes that "tuple" and "bib"'s session doesn't exist, and creates it. Returns the resulting
* entry in "session".
* Assumes that "tuple" represents a IPv6 packet.
*/
static int create_session_ipv6(struct tuple *tuple6, struct bib_entry *bib,
struct session_entry **session, enum session_timer_type timer_type, enum tcp_state state)
{
struct ipv6_prefix prefix;
struct in_addr ipv4_dst;
struct ipv4_transport_addr addr4;
int error;
/* Translate address from IPv6 to IPv4 */
error = pool6_get(&tuple6->dst.addr6.l3, &prefix);
if (error) {
log_debug("Errcode %d while obtaining %pI6c's prefix.", error, &tuple6->dst.addr6.l3);
return error;
}
error = addr_6to4(&tuple6->dst.addr6.l3, &prefix, &ipv4_dst);
if (error) {
log_debug("Error code %d while translating the packet's address.", error);
return error;
}
/*
* Create the session entry.
*
* Fortunately, ICMP errors cannot reach this code because of the requirements in the header
* of section 3.5, so we can use the tuple as shortcuts for the packet's fields.
*/
addr4.l3 = ipv4_dst;
addr4.l4 = (tuple6->l4_proto != L4PROTO_ICMP) ? tuple6->dst.addr6.l4 : bib->ipv4.l4;
*session = session_create(&tuple6->src.addr6, &tuple6->dst.addr6,
&bib->ipv4, &addr4, tuple6->l4_proto, bib);
if (!(*session)) {
log_debug("Failed to allocate a session entry.");
return -ENOMEM;
}
(*session)->state = state;
apply_policies();
/* Add it to the table. */
error = sessiondb_add(*session, timer_type);
if (error) {
session_return(*session);
log_debug("Error code %d while adding the session to the DB.", error);
return error;
}
return 0;
}
int rfc6052_6to4(struct pool6 *pool, const struct in6_addr *addr6,
struct in_addr *result)
{
struct ipv6_prefix prefix;
int error;
error = pool6_find(pool, addr6, &prefix);
if (error) {
log_debug("Could not find a prefix that matches %pI6c.", addr6);
return error;
}
return addr_6to4(addr6, &prefix, result);
}
