* IP traffic received on those IPs via the GNUnet mesh
* @author Philipp Toelke
* @author Christian Grothoff
- *
- * TODO:
- * Basics:
- * - test!
- *
- * Features:
- * - add back ICMP support (especially needed for IPv6)
*/
#include "platform.h"
#include "gnunet_util_lib.h"
};
+/**
+ * Return value from 'main'.
+ */
+static int global_ret;
+
/**
* Configuration we use.
*/
GNUNET_STATISTICS_update (stats,
gettext_noop ("# Active tunnels"),
-1, GNUNET_NO);
- if (GNUNET_SCHEDULER_NO_TASK != ts->destroy_task)
- {
- GNUNET_SCHEDULER_cancel (ts->destroy_task);
- ts->destroy_task = GNUNET_SCHEDULER_NO_TASK;
- }
while (NULL != (tnq = ts->tmq_head))
{
GNUNET_CONTAINER_DLL_remove (ts->tmq_head,
ts->tunnel = NULL;
GNUNET_MESH_tunnel_destroy (tunnel);
}
+ if (GNUNET_SCHEDULER_NO_TASK != ts->destroy_task)
+ {
+ GNUNET_SCHEDULER_cancel (ts->destroy_task);
+ ts->destroy_task = GNUNET_SCHEDULER_NO_TASK;
+ }
if (NULL != ts->heap_node)
{
GNUNET_CONTAINER_heap_remove_node (ts->heap_node);
* Destroy the mesh tunnel.
*
* @param cls the 'struct TunnelState' with the tunnel to destroy
- * @param ts schedule context
+ * @param tc scheduler context
*/
static void
destroy_tunnel_task (void *cls,
GNUNET_CONTAINER_DLL_remove (ts->tmq_head,
ts->tmq_tail,
dq);
+ ts->tmq_length--;
GNUNET_MESH_notify_transmit_ready_cancel (ts->th);
ts->th = NULL;
GNUNET_STATISTICS_update (stats,
*
* @param de destination entry for which we need to setup a tunnel
* @param client client to notify on successful tunnel setup, or NULL for none
+ * @param client_af address family of the address returned to the client
* @param request_id request ID to send in client notification (unused if client is NULL)
* @return tunnel state of the tunnel that was created
*/
static struct TunnelState *
create_tunnel_to_destination (struct DestinationEntry *de,
struct GNUNET_SERVER_Client *client,
+ int client_af,
uint64_t request_id)
{
struct TunnelState *ts;
1, GNUNET_NO);
GNUNET_assert (NULL == de->ts);
ts = GNUNET_malloc (sizeof (struct TunnelState));
+ ts->af = client_af;
if (NULL != client)
{
ts->request_id = request_id;
ts->destination.heap_node = NULL; /* copy is NOT in destination heap */
de->ts = ts;
ts->destination_container = de; /* we are referenced from de */
- ts->af = AF_UNSPEC; /* so far, unknown */
ts->tunnel = GNUNET_MESH_tunnel_create (mesh_handle,
ts,
&tunnel_peer_connect_handler,
struct TunnelState *ts;
ts = GNUNET_CONTAINER_heap_peek (tunnel_heap);
+ GNUNET_assert (NULL != ts);
if (except == ts)
return; /* can't do this */
free_tunnel_state (ts);
int is_new;
const struct GNUNET_TUN_UdpHeader *udp;
const struct GNUNET_TUN_TcpHeader *tcp;
+ const struct GNUNET_TUN_IcmpHeader *icmp;
uint16_t spt;
uint16_t dpt;
&key);
}
break;
+ case IPPROTO_ICMP:
+ {
+ if (payload_length < sizeof (struct GNUNET_TUN_IcmpHeader))
+ {
+ /* blame kernel? */
+ GNUNET_break (0);
+ return;
+ }
+ icmp = payload;
+ spt = 0;
+ dpt = 0;
+ get_tunnel_key_from_ips (af,
+ IPPROTO_ICMP,
+ source_ip,
+ 0,
+ destination_ip,
+ 0,
+ &key);
+ }
+ break;
default:
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
_("Protocol %u not supported, dropping\n"),
available) or create a fresh one */
is_new = GNUNET_YES;
if (NULL == destination->ts)
- ts = create_tunnel_to_destination (destination, NULL, 0);
+ ts = create_tunnel_to_destination (destination, NULL, af, 0);
else
ts = destination->ts;
if (NULL == ts)
struct GNUNET_EXIT_TcpDataMessage *tdm;
mlen = sizeof (struct GNUNET_EXIT_TcpDataMessage) +
- alen + payload_length - sizeof (struct GNUNET_TUN_TcpHeader);
+ payload_length - sizeof (struct GNUNET_TUN_TcpHeader);
if (mlen >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
{
GNUNET_break (0);
tnq->msg = &tnq[1];
tdm = (struct GNUNET_EXIT_TcpDataMessage *) &tnq[1];
tdm->header.size = htons ((uint16_t) mlen);
- tdm->header.type = htons (GNUNET_MESSAGE_TYPE_VPN_TCP_DATA);
+ tdm->header.type = htons (GNUNET_MESSAGE_TYPE_VPN_TCP_DATA_TO_EXIT);
tdm->reserved = htonl (0);
tdm->tcp_header = *tcp;
memcpy (&tdm[1],
payload_length - sizeof (struct GNUNET_TUN_TcpHeader));
}
break;
+ case IPPROTO_ICMP:
+ if (destination->is_service)
+ {
+ struct GNUNET_EXIT_IcmpServiceMessage *ism;
+
+ mlen = sizeof (struct GNUNET_EXIT_IcmpServiceMessage) +
+ payload_length - sizeof (struct GNUNET_TUN_IcmpHeader);
+ if (mlen >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
+ {
+ GNUNET_break (0);
+ return;
+ }
+ tnq = GNUNET_malloc (sizeof (struct TunnelMessageQueueEntry) + mlen);
+ tnq->msg = &tnq[1];
+ ism = (struct GNUNET_EXIT_IcmpServiceMessage *) &tnq[1];
+ ism->header.type = htons (GNUNET_MESSAGE_TYPE_VPN_ICMP_TO_SERVICE);
+ ism->af = htonl (af); /* need to tell destination ICMP protocol family! */
+ ism->service_descriptor = destination->details.service_destination.service_descriptor;
+ ism->icmp_header = *icmp;
+ /* ICMP protocol translation will be done by the receiver (as we don't know
+ the target AF); however, we still need to possibly discard the payload
+ depending on the ICMP type */
+ switch (af)
+ {
+ case AF_INET:
+ switch (icmp->type)
+ {
+ case GNUNET_TUN_ICMPTYPE_ECHO_REPLY:
+ case GNUNET_TUN_ICMPTYPE_ECHO_REQUEST:
+ break;
+ case GNUNET_TUN_ICMPTYPE_DESTINATION_UNREACHABLE:
+ case GNUNET_TUN_ICMPTYPE_SOURCE_QUENCH:
+ case GNUNET_TUN_ICMPTYPE_TIME_EXCEEDED:
+ /* throw away ICMP payload, won't be useful for the other side anyway */
+ payload_length = sizeof (struct GNUNET_TUN_IcmpHeader);
+ break;
+ default:
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop ("# ICMPv4 packets dropped (not allowed)"),
+ 1, GNUNET_NO);
+ return;
+ }
+ /* end of AF_INET */
+ break;
+ case AF_INET6:
+ switch (icmp->type)
+ {
+ case GNUNET_TUN_ICMPTYPE6_DESTINATION_UNREACHABLE:
+ case GNUNET_TUN_ICMPTYPE6_PACKET_TOO_BIG:
+ case GNUNET_TUN_ICMPTYPE6_TIME_EXCEEDED:
+ case GNUNET_TUN_ICMPTYPE6_PARAMETER_PROBLEM:
+ /* throw away ICMP payload, won't be useful for the other side anyway */
+ payload_length = sizeof (struct GNUNET_TUN_IcmpHeader);
+ break;
+ case GNUNET_TUN_ICMPTYPE6_ECHO_REQUEST:
+ case GNUNET_TUN_ICMPTYPE6_ECHO_REPLY:
+ break;
+ default:
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop ("# ICMPv6 packets dropped (not allowed)"),
+ 1, GNUNET_NO);
+ return;
+ }
+ /* end of AF_INET6 */
+ break;
+ default:
+ GNUNET_assert (0);
+ break;
+ }
+
+ /* update length calculations, as payload_length may have changed */
+ mlen = sizeof (struct GNUNET_EXIT_IcmpServiceMessage) +
+ alen + payload_length - sizeof (struct GNUNET_TUN_IcmpHeader);
+ tnq->len = mlen;
+ ism->header.size = htons ((uint16_t) mlen);
+ /* finally, copy payload (if there is any left...) */
+ memcpy (&ism[1],
+ &icmp[1],
+ payload_length - sizeof (struct GNUNET_TUN_IcmpHeader));
+ }
+ else
+ {
+ struct GNUNET_EXIT_IcmpInternetMessage *iim;
+ struct in_addr *ip4dst;
+ struct in6_addr *ip6dst;
+ void *payload;
+
+ mlen = sizeof (struct GNUNET_EXIT_IcmpInternetMessage) +
+ alen + payload_length - sizeof (struct GNUNET_TUN_IcmpHeader);
+ if (mlen >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
+ {
+ GNUNET_break (0);
+ return;
+ }
+ tnq = GNUNET_malloc (sizeof (struct TunnelMessageQueueEntry) +
+ mlen);
+ tnq->msg = &tnq[1];
+ iim = (struct GNUNET_EXIT_IcmpInternetMessage *) &tnq[1];
+ iim->header.type = htons (GNUNET_MESSAGE_TYPE_VPN_ICMP_TO_INTERNET);
+ iim->icmp_header = *icmp;
+ /* Perform ICMP protocol-translation (depending on destination AF and source AF)
+ and throw away ICMP payload depending on ICMP message type */
+ switch (af)
+ {
+ case AF_INET:
+ switch (icmp->type)
+ {
+ case GNUNET_TUN_ICMPTYPE_ECHO_REPLY:
+ if (destination->details.exit_destination.af == AF_INET6)
+ iim->icmp_header.type = GNUNET_TUN_ICMPTYPE6_ECHO_REPLY;
+ break;
+ case GNUNET_TUN_ICMPTYPE_ECHO_REQUEST:
+ if (destination->details.exit_destination.af == AF_INET6)
+ iim->icmp_header.type = GNUNET_TUN_ICMPTYPE6_ECHO_REQUEST;
+ break;
+ case GNUNET_TUN_ICMPTYPE_DESTINATION_UNREACHABLE:
+ if (destination->details.exit_destination.af == AF_INET6)
+ iim->icmp_header.type = GNUNET_TUN_ICMPTYPE6_DESTINATION_UNREACHABLE;
+ /* throw away IP-payload, exit will have to make it up anyway */
+ payload_length = sizeof (struct GNUNET_TUN_IcmpHeader);
+ break;
+ case GNUNET_TUN_ICMPTYPE_TIME_EXCEEDED:
+ if (destination->details.exit_destination.af == AF_INET6)
+ iim->icmp_header.type = GNUNET_TUN_ICMPTYPE6_TIME_EXCEEDED;
+ /* throw away IP-payload, exit will have to make it up anyway */
+ payload_length = sizeof (struct GNUNET_TUN_IcmpHeader);
+ break;
+ case GNUNET_TUN_ICMPTYPE_SOURCE_QUENCH:
+ if (destination->details.exit_destination.af == AF_INET6)
+ {
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop ("# ICMPv4 packets dropped (impossible PT to v6)"),
+ 1, GNUNET_NO);
+ GNUNET_free (tnq);
+ return;
+ }
+ /* throw away IP-payload, exit will have to make it up anyway */
+ payload_length = sizeof (struct GNUNET_TUN_IcmpHeader);
+ break;
+ default:
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop ("# ICMPv4 packets dropped (type not allowed)"),
+ 1, GNUNET_NO);
+ GNUNET_free (tnq);
+ return;
+ }
+ /* end of AF_INET */
+ break;
+ case AF_INET6:
+ switch (icmp->type)
+ {
+ case GNUNET_TUN_ICMPTYPE6_DESTINATION_UNREACHABLE:
+ if (destination->details.exit_destination.af == AF_INET6)
+ iim->icmp_header.type = GNUNET_TUN_ICMPTYPE6_DESTINATION_UNREACHABLE;
+ /* throw away IP-payload, exit will have to make it up anyway */
+ payload_length = sizeof (struct GNUNET_TUN_IcmpHeader);
+ break;
+ case GNUNET_TUN_ICMPTYPE6_TIME_EXCEEDED:
+ if (destination->details.exit_destination.af == AF_INET)
+ iim->icmp_header.type = GNUNET_TUN_ICMPTYPE_TIME_EXCEEDED;
+ /* throw away IP-payload, exit will have to make it up anyway */
+ payload_length = sizeof (struct GNUNET_TUN_IcmpHeader);
+ break;
+ case GNUNET_TUN_ICMPTYPE6_PACKET_TOO_BIG:
+ if (destination->details.exit_destination.af == AF_INET)
+ {
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop ("# ICMPv6 packets dropped (impossible PT to v4)"),
+ 1, GNUNET_NO);
+ GNUNET_free (tnq);
+ return;
+ }
+ /* throw away IP-payload, exit will have to make it up anyway */
+ payload_length = sizeof (struct GNUNET_TUN_IcmpHeader);
+ break;
+ case GNUNET_TUN_ICMPTYPE6_PARAMETER_PROBLEM:
+ if (destination->details.exit_destination.af == AF_INET)
+ {
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop ("# ICMPv6 packets dropped (impossible PT to v4)"),
+ 1, GNUNET_NO);
+ GNUNET_free (tnq);
+ return;
+ }
+ /* throw away IP-payload, exit will have to make it up anyway */
+ payload_length = sizeof (struct GNUNET_TUN_IcmpHeader);
+ break;
+ case GNUNET_TUN_ICMPTYPE6_ECHO_REQUEST:
+ if (destination->details.exit_destination.af == AF_INET)
+ iim->icmp_header.type = GNUNET_TUN_ICMPTYPE_ECHO_REQUEST;
+ break;
+ case GNUNET_TUN_ICMPTYPE6_ECHO_REPLY:
+ if (destination->details.exit_destination.af == AF_INET)
+ iim->icmp_header.type = GNUNET_TUN_ICMPTYPE_ECHO_REPLY;
+ break;
+ default:
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop ("# ICMPv6 packets dropped (type not allowed)"),
+ 1, GNUNET_NO);
+ GNUNET_free (tnq);
+ return;
+ }
+ /* end of AF_INET6 */
+ break;
+ default:
+ GNUNET_assert (0);
+ }
+ /* update length calculations, as payload_length may have changed */
+ mlen = sizeof (struct GNUNET_EXIT_IcmpInternetMessage) +
+ alen + payload_length - sizeof (struct GNUNET_TUN_IcmpHeader);
+ tnq->len = mlen;
+ iim->header.size = htons ((uint16_t) mlen);
+
+ /* need to tell destination ICMP protocol family! */
+ iim->af = htonl (destination->details.exit_destination.af);
+ switch (destination->details.exit_destination.af)
+ {
+ case AF_INET:
+ ip4dst = (struct in_addr *) &iim[1];
+ *ip4dst = destination->details.exit_destination.ip.v4;
+ payload = &ip4dst[1];
+ break;
+ case AF_INET6:
+ ip6dst = (struct in6_addr *) &iim[1];
+ *ip6dst = destination->details.exit_destination.ip.v6;
+ payload = &ip6dst[1];
+ break;
+ default:
+ GNUNET_assert (0);
+ }
+ memcpy (payload,
+ &icmp[1],
+ payload_length - sizeof (struct GNUNET_TUN_IcmpHeader));
+ }
+ break;
default:
/* not supported above, how can we get here !? */
GNUNET_assert (0);
}
+/**
+ * Synthesize a plausible ICMP payload for an ICMP error
+ * response on the given tunnel.
+ *
+ * @param ts tunnel information
+ * @param ipp IPv4 header to fill in (ICMP payload)
+ * @param udp "UDP" header to fill in (ICMP payload); might actually
+ * also be the first 8 bytes of the TCP header
+ */
+static void
+make_up_icmpv4_payload (struct TunnelState *ts,
+ struct GNUNET_TUN_IPv4Header *ipp,
+ struct GNUNET_TUN_UdpHeader *udp)
+{
+ GNUNET_TUN_initialize_ipv4_header (ipp,
+ ts->protocol,
+ sizeof (struct GNUNET_TUN_TcpHeader),
+ &ts->source_ip.v4,
+ &ts->destination_ip.v4);
+ udp->spt = htons (ts->source_port);
+ udp->dpt = htons (ts->destination_port);
+ udp->len = htons (0);
+ udp->crc = htons (0);
+}
+
+
+/**
+ * Synthesize a plausible ICMP payload for an ICMP error
+ * response on the given tunnel.
+ *
+ * @param ts tunnel information
+ * @param ipp IPv6 header to fill in (ICMP payload)
+ * @param udp "UDP" header to fill in (ICMP payload); might actually
+ * also be the first 8 bytes of the TCP header
+ */
+static void
+make_up_icmpv6_payload (struct TunnelState *ts,
+ struct GNUNET_TUN_IPv6Header *ipp,
+ struct GNUNET_TUN_UdpHeader *udp)
+{
+ GNUNET_TUN_initialize_ipv6_header (ipp,
+ ts->protocol,
+ sizeof (struct GNUNET_TUN_TcpHeader),
+ &ts->source_ip.v6,
+ &ts->destination_ip.v6);
+ udp->spt = htons (ts->source_port);
+ udp->dpt = htons (ts->destination_port);
+ udp->len = htons (0);
+ udp->crc = htons (0);
+}
+
+
+/**
+ * We got an ICMP packet back from the MESH tunnel. Pass it on to the
+ * local virtual interface via the helper.
+ *
+ * @param cls closure, NULL
+ * @param tunnel connection to the other end
+ * @param tunnel_ctx pointer to our 'struct TunnelState *'
+ * @param sender who sent the message
+ * @param message the actual message
+ * @param atsi performance data for the connection
+ * @return GNUNET_OK to keep the connection open,
+ * GNUNET_SYSERR to close it (signal serious error)
+ */
+static int
+receive_icmp_back (void *cls GNUNET_UNUSED, struct GNUNET_MESH_Tunnel *tunnel,
+ void **tunnel_ctx, const struct GNUNET_PeerIdentity *sender,
+ const struct GNUNET_MessageHeader *message,
+ const struct GNUNET_ATS_Information *atsi GNUNET_UNUSED)
+{
+ struct TunnelState *ts = *tunnel_ctx;
+ const struct GNUNET_EXIT_IcmpToVPNMessage *i2v;
+ size_t mlen;
+
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop ("# ICMP packets received from mesh"),
+ 1, GNUNET_NO);
+ mlen = ntohs (message->size);
+ if (mlen < sizeof (struct GNUNET_EXIT_IcmpToVPNMessage))
+ {
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
+ if (NULL == ts->heap_node)
+ {
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
+ if (AF_UNSPEC == ts->af)
+ {
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
+ i2v = (const struct GNUNET_EXIT_IcmpToVPNMessage *) message;
+ mlen -= sizeof (struct GNUNET_EXIT_IcmpToVPNMessage);
+ {
+ char sbuf[INET6_ADDRSTRLEN];
+ char dbuf[INET6_ADDRSTRLEN];
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Received ICMP packet from mesh, sending %u bytes from %s -> %s via TUN\n",
+ (unsigned int) mlen,
+ inet_ntop (ts->af, &ts->destination_ip, sbuf, sizeof (sbuf)),
+ inet_ntop (ts->af, &ts->source_ip, dbuf, sizeof (dbuf)));
+ }
+ switch (ts->af)
+ {
+ case AF_INET:
+ {
+ size_t size = sizeof (struct GNUNET_TUN_IPv4Header)
+ + sizeof (struct GNUNET_TUN_IcmpHeader)
+ + sizeof (struct GNUNET_MessageHeader) +
+ sizeof (struct GNUNET_TUN_Layer2PacketHeader) +
+ mlen;
+ {
+ /* reserve some extra space in case we have an ICMP type here where
+ we will need to make up the payload ourselves */
+ char buf[size + sizeof (struct GNUNET_TUN_IPv4Header) + 8];
+ struct GNUNET_MessageHeader *msg = (struct GNUNET_MessageHeader *) buf;
+ struct GNUNET_TUN_Layer2PacketHeader *tun = (struct GNUNET_TUN_Layer2PacketHeader*) &msg[1];
+ struct GNUNET_TUN_IPv4Header *ipv4 = (struct GNUNET_TUN_IPv4Header *) &tun[1];
+ struct GNUNET_TUN_IcmpHeader *icmp = (struct GNUNET_TUN_IcmpHeader *) &ipv4[1];
+ msg->type = htons (GNUNET_MESSAGE_TYPE_VPN_HELPER);
+ tun->flags = htons (0);
+ tun->proto = htons (ETH_P_IPV4);
+ GNUNET_TUN_initialize_ipv4_header (ipv4,
+ IPPROTO_ICMP,
+ sizeof (struct GNUNET_TUN_IcmpHeader) + mlen,
+ &ts->destination_ip.v4,
+ &ts->source_ip.v4);
+ *icmp = i2v->icmp_header;
+ memcpy (&icmp[1],
+ &i2v[1],
+ mlen);
+ /* For some ICMP types, we need to adjust (make up) the payload here.
+ Also, depending on the AF used on the other side, we have to
+ do ICMP PT (translate ICMP types) */
+ switch (ntohl (i2v->af))
+ {
+ case AF_INET:
+ switch (icmp->type)
+ {
+ case GNUNET_TUN_ICMPTYPE_ECHO_REPLY:
+ case GNUNET_TUN_ICMPTYPE_ECHO_REQUEST:
+ break;
+ case GNUNET_TUN_ICMPTYPE_DESTINATION_UNREACHABLE:
+ case GNUNET_TUN_ICMPTYPE_SOURCE_QUENCH:
+ case GNUNET_TUN_ICMPTYPE_TIME_EXCEEDED:
+ {
+ struct GNUNET_TUN_IPv4Header *ipp = (struct GNUNET_TUN_IPv4Header *) &icmp[1];
+ struct GNUNET_TUN_UdpHeader *udp = (struct GNUNET_TUN_UdpHeader *) &ipp[1];
+
+ if (mlen != 0)
+ {
+ /* sender did not strip ICMP payload? */
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
+ size += sizeof (struct GNUNET_TUN_IPv4Header) + 8;
+ GNUNET_assert (8 == sizeof (struct GNUNET_TUN_UdpHeader));
+ make_up_icmpv4_payload (ts, ipp, udp);
+ }
+ break;
+ default:
+ GNUNET_break_op (0);
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop ("# ICMPv4 packets dropped (type not allowed)"),
+ 1, GNUNET_NO);
+ return GNUNET_SYSERR;
+ }
+ /* end AF_INET */
+ break;
+ case AF_INET6:
+ /* ICMP PT 6-to-4 and possibly making up payloads */
+ switch (icmp->type)
+ {
+ case GNUNET_TUN_ICMPTYPE6_DESTINATION_UNREACHABLE:
+ icmp->type = GNUNET_TUN_ICMPTYPE_DESTINATION_UNREACHABLE;
+ {
+ struct GNUNET_TUN_IPv4Header *ipp = (struct GNUNET_TUN_IPv4Header *) &icmp[1];
+ struct GNUNET_TUN_UdpHeader *udp = (struct GNUNET_TUN_UdpHeader *) &ipp[1];
+
+ if (mlen != 0)
+ {
+ /* sender did not strip ICMP payload? */
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
+ size += sizeof (struct GNUNET_TUN_IPv4Header) + 8;
+ GNUNET_assert (8 == sizeof (struct GNUNET_TUN_UdpHeader));
+ make_up_icmpv4_payload (ts, ipp, udp);
+ }
+ break;
+ case GNUNET_TUN_ICMPTYPE6_TIME_EXCEEDED:
+ icmp->type = GNUNET_TUN_ICMPTYPE_TIME_EXCEEDED;
+ {
+ struct GNUNET_TUN_IPv4Header *ipp = (struct GNUNET_TUN_IPv4Header *) &icmp[1];
+ struct GNUNET_TUN_UdpHeader *udp = (struct GNUNET_TUN_UdpHeader *) &ipp[1];
+
+ if (mlen != 0)
+ {
+ /* sender did not strip ICMP payload? */
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
+ size += sizeof (struct GNUNET_TUN_IPv4Header) + 8;
+ GNUNET_assert (8 == sizeof (struct GNUNET_TUN_UdpHeader));
+ make_up_icmpv4_payload (ts, ipp, udp);
+ }
+ break;
+ case GNUNET_TUN_ICMPTYPE6_PACKET_TOO_BIG:
+ case GNUNET_TUN_ICMPTYPE6_PARAMETER_PROBLEM:
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop ("# ICMPv6 packets dropped (impossible PT to v4)"),
+ 1, GNUNET_NO);
+ return GNUNET_OK;
+ case GNUNET_TUN_ICMPTYPE6_ECHO_REQUEST:
+ icmp->type = GNUNET_TUN_ICMPTYPE_ECHO_REQUEST;
+ break;
+ case GNUNET_TUN_ICMPTYPE6_ECHO_REPLY:
+ icmp->type = GNUNET_TUN_ICMPTYPE_ECHO_REPLY;
+ break;
+ default:
+ GNUNET_break_op (0);
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop ("# ICMPv6 packets dropped (type not allowed)"),
+ 1, GNUNET_NO);
+ return GNUNET_SYSERR;
+ }
+ /* end AF_INET6 */
+ break;
+ default:
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
+ msg->size = htons (size);
+ GNUNET_TUN_calculate_icmp_checksum (icmp,
+ &i2v[1],
+ mlen);
+ (void) GNUNET_HELPER_send (helper_handle,
+ msg,
+ GNUNET_YES,
+ NULL, NULL);
+ }
+ }
+ break;
+ case AF_INET6:
+ {
+ size_t size = sizeof (struct GNUNET_TUN_IPv6Header)
+ + sizeof (struct GNUNET_TUN_IcmpHeader)
+ + sizeof (struct GNUNET_MessageHeader) +
+ sizeof (struct GNUNET_TUN_Layer2PacketHeader) +
+ mlen;
+ {
+ char buf[size + sizeof (struct GNUNET_TUN_IPv6Header) + 8];
+ struct GNUNET_MessageHeader *msg = (struct GNUNET_MessageHeader *) buf;
+ struct GNUNET_TUN_Layer2PacketHeader *tun = (struct GNUNET_TUN_Layer2PacketHeader*) &msg[1];
+ struct GNUNET_TUN_IPv6Header *ipv6 = (struct GNUNET_TUN_IPv6Header *) &tun[1];
+ struct GNUNET_TUN_IcmpHeader *icmp = (struct GNUNET_TUN_IcmpHeader *) &ipv6[1];
+ msg->type = htons (GNUNET_MESSAGE_TYPE_VPN_HELPER);
+ tun->flags = htons (0);
+ tun->proto = htons (ETH_P_IPV6);
+ GNUNET_TUN_initialize_ipv6_header (ipv6,
+ IPPROTO_ICMP,
+ sizeof (struct GNUNET_TUN_IcmpHeader) + mlen,
+ &ts->destination_ip.v6,
+ &ts->source_ip.v6);
+ *icmp = i2v->icmp_header;
+ memcpy (&icmp[1],
+ &i2v[1],
+ mlen);
+
+ /* For some ICMP types, we need to adjust (make up) the payload here.
+ Also, depending on the AF used on the other side, we have to
+ do ICMP PT (translate ICMP types) */
+ switch (ntohl (i2v->af))
+ {
+ case AF_INET:
+ /* ICMP PT 4-to-6 and possibly making up payloads */
+ switch (icmp->type)
+ {
+ case GNUNET_TUN_ICMPTYPE_ECHO_REPLY:
+ icmp->type = GNUNET_TUN_ICMPTYPE6_ECHO_REPLY;
+ break;
+ case GNUNET_TUN_ICMPTYPE_ECHO_REQUEST:
+ icmp->type = GNUNET_TUN_ICMPTYPE6_ECHO_REQUEST;
+ break;
+ case GNUNET_TUN_ICMPTYPE_DESTINATION_UNREACHABLE:
+ icmp->type = GNUNET_TUN_ICMPTYPE6_DESTINATION_UNREACHABLE;
+ {
+ struct GNUNET_TUN_IPv6Header *ipp = (struct GNUNET_TUN_IPv6Header *) &icmp[1];
+ struct GNUNET_TUN_UdpHeader *udp = (struct GNUNET_TUN_UdpHeader *) &ipp[1];
+
+ if (mlen != 0)
+ {
+ /* sender did not strip ICMP payload? */
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
+ size += sizeof (struct GNUNET_TUN_IPv6Header) + 8;
+ GNUNET_assert (8 == sizeof (struct GNUNET_TUN_UdpHeader));
+ make_up_icmpv6_payload (ts, ipp, udp);
+ }
+ break;
+ case GNUNET_TUN_ICMPTYPE_TIME_EXCEEDED:
+ icmp->type = GNUNET_TUN_ICMPTYPE6_TIME_EXCEEDED;
+ {
+ struct GNUNET_TUN_IPv6Header *ipp = (struct GNUNET_TUN_IPv6Header *) &icmp[1];
+ struct GNUNET_TUN_UdpHeader *udp = (struct GNUNET_TUN_UdpHeader *) &ipp[1];
+
+ if (mlen != 0)
+ {
+ /* sender did not strip ICMP payload? */
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
+ size += sizeof (struct GNUNET_TUN_IPv6Header) + 8;
+ GNUNET_assert (8 == sizeof (struct GNUNET_TUN_UdpHeader));
+ make_up_icmpv6_payload (ts, ipp, udp);
+ }
+ break;
+ case GNUNET_TUN_ICMPTYPE_SOURCE_QUENCH:
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop ("# ICMPv4 packets dropped (impossible PT to v6)"),
+ 1, GNUNET_NO);
+ return GNUNET_OK;
+ default:
+ GNUNET_break_op (0);
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop ("# ICMPv4 packets dropped (type not allowed)"),
+ 1, GNUNET_NO);
+ return GNUNET_SYSERR;
+ }
+ /* end AF_INET */
+ break;
+ case AF_INET6:
+ switch (icmp->type)
+ {
+ case GNUNET_TUN_ICMPTYPE6_DESTINATION_UNREACHABLE:
+ case GNUNET_TUN_ICMPTYPE6_TIME_EXCEEDED:
+ case GNUNET_TUN_ICMPTYPE6_PACKET_TOO_BIG:
+ case GNUNET_TUN_ICMPTYPE6_PARAMETER_PROBLEM:
+ {
+ struct GNUNET_TUN_IPv6Header *ipp = (struct GNUNET_TUN_IPv6Header *) &icmp[1];
+ struct GNUNET_TUN_UdpHeader *udp = (struct GNUNET_TUN_UdpHeader *) &ipp[1];
+
+ if (mlen != 0)
+ {
+ /* sender did not strip ICMP payload? */
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
+ size += sizeof (struct GNUNET_TUN_IPv6Header) + 8;
+ GNUNET_assert (8 == sizeof (struct GNUNET_TUN_UdpHeader));
+ make_up_icmpv6_payload (ts, ipp, udp);
+ }
+ break;
+ case GNUNET_TUN_ICMPTYPE6_ECHO_REQUEST:
+ break;
+ default:
+ GNUNET_break_op (0);
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop ("# ICMPv6 packets dropped (type not allowed)"),
+ 1, GNUNET_NO);
+ return GNUNET_SYSERR;
+ }
+ /* end AF_INET6 */
+ break;
+ default:
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
+ msg->size = htons (size);
+ GNUNET_TUN_calculate_icmp_checksum (icmp,
+ &i2v[1], mlen);
+ (void) GNUNET_HELPER_send (helper_handle,
+ msg,
+ GNUNET_YES,
+ NULL, NULL);
+ }
+ }
+ break;
+ default:
+ GNUNET_assert (0);
+ }
+ GNUNET_CONTAINER_heap_update_cost (tunnel_heap,
+ ts->heap_node,
+ GNUNET_TIME_absolute_get ().abs_value);
+ return GNUNET_OK;
+}
+
+
/**
* We got a UDP packet back from the MESH tunnel. Pass it on to the
* local virtual interface via the helper.
struct DestinationEntry *de;
de = GNUNET_CONTAINER_heap_peek (destination_heap);
+ GNUNET_assert (NULL != de);
if (except == de)
return; /* can't do this */
free_destination_entry (de);
void *addr;
struct DestinationEntry *de;
GNUNET_HashCode key;
+ struct TunnelState *ts;
/* validate and parse request */
mlen = ntohs (message->size);
1, GNUNET_NO);
while (GNUNET_CONTAINER_multihashmap_size (destination_map) > max_destination_mappings)
expire_destination (de);
-
+
/* setup tunnel to destination */
- (void) create_tunnel_to_destination (de,
- (GNUNET_NO == ntohl (msg->nac)) ? NULL : client,
- msg->request_id);
+ ts = create_tunnel_to_destination (de,
+ (GNUNET_NO == ntohl (msg->nac)) ? NULL : client,
+ result_af,
+ msg->request_id);
+ switch (result_af)
+ {
+ case AF_INET:
+ ts->destination_ip.v4 = v4;
+ break;
+ case AF_INET6:
+ ts->destination_ip.v6 = v6;
+ break;
+ default:
+ GNUNET_assert (0);
+ }
/* we're done */
GNUNET_SERVER_receive_done (client, GNUNET_OK);
}
void *addr;
struct DestinationEntry *de;
GNUNET_HashCode key;
+ struct TunnelState *ts;
/* parse request */
msg = (const struct RedirectToServiceRequestMessage *) message;
GNUNET_TIME_absolute_ntoh (msg->expiration_time).abs_value);
while (GNUNET_CONTAINER_multihashmap_size (destination_map) > max_destination_mappings)
expire_destination (de);
- (void) create_tunnel_to_destination (de,
- (GNUNET_NO == ntohl (msg->nac)) ? NULL : client,
- msg->request_id);
+ ts = create_tunnel_to_destination (de,
+ (GNUNET_NO == ntohl (msg->nac)) ? NULL : client,
+ result_af,
+ msg->request_id);
+ switch (result_af)
+ {
+ case AF_INET:
+ ts->destination_ip.v4 = v4;
+ break;
+ case AF_INET6:
+ ts->destination_ip.v6 = v6;
+ break;
+ default:
+ GNUNET_assert (0);
+ }
/* we're done */
GNUNET_SERVER_receive_done (client, GNUNET_OK);
}
static void
tunnel_cleaner (void *cls, const struct GNUNET_MESH_Tunnel *tunnel, void *tunnel_ctx)
{
- struct TunnelState *ts = tunnel_ctx;
-
- if (NULL == ts)
- {
- GNUNET_break (0);
- return;
- }
- GNUNET_assert (ts->tunnel == tunnel);
- ts->tunnel = NULL;
- free_tunnel_state (ts);
+ /* we don't have inbound tunnels, so this function should never be called */
+ GNUNET_break (0);
}
}
if (stats != NULL)
{
- GNUNET_STATISTICS_destroy (stats, GNUNET_YES);
+ GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
stats = NULL;
}
for (i=0;i<5;i++)
{
static const struct GNUNET_SERVER_MessageHandler service_handlers[] = {
/* callback, cls, type, size */
- {&service_redirect_to_ip, NULL, GNUNET_MESSAGE_TYPE_VPN_CLIENT_REDIRECT_TO_IP, 0},
- {&service_redirect_to_service, NULL,
+ { &service_redirect_to_ip, NULL, GNUNET_MESSAGE_TYPE_VPN_CLIENT_REDIRECT_TO_IP, 0},
+ { &service_redirect_to_service, NULL,
GNUNET_MESSAGE_TYPE_VPN_CLIENT_REDIRECT_TO_SERVICE,
sizeof (struct RedirectToServiceRequestMessage) },
{NULL, NULL, 0, 0}
};
static const struct GNUNET_MESH_MessageHandler mesh_handlers[] = {
- {receive_udp_back, GNUNET_MESSAGE_TYPE_VPN_SERVICE_UDP_BACK, 0},
- {receive_tcp_back, GNUNET_MESSAGE_TYPE_VPN_SERVICE_TCP_BACK, 0},
- {receive_udp_back, GNUNET_MESSAGE_TYPE_VPN_REMOTE_UDP_BACK, 0},
- {receive_tcp_back, GNUNET_MESSAGE_TYPE_VPN_REMOTE_TCP_BACK, 0},
+ { &receive_udp_back, GNUNET_MESSAGE_TYPE_VPN_UDP_REPLY, 0},
+ { &receive_tcp_back, GNUNET_MESSAGE_TYPE_VPN_TCP_DATA_TO_VPN, 0},
+ { &receive_icmp_back, GNUNET_MESSAGE_TYPE_VPN_ICMP_TO_VPN, 0},
{NULL, 0, 0}
};
static const GNUNET_MESH_ApplicationType types[] = {
struct in_addr v4;
struct in6_addr v6;
+ if (GNUNET_YES !=
+ GNUNET_OS_check_helper_binary ("gnunet-helper-vpn"))
+ {
+ fprintf (stderr,
+ "`%s' is not SUID, refusing to run.\n",
+ "gnunet-helper-vpn");
+ global_ret = 1;
+ return;
+ }
cfg = cfg_;
stats = GNUNET_STATISTICS_create ("vpn", cfg);
if (GNUNET_OK !=
return (GNUNET_OK ==
GNUNET_SERVICE_run (argc, argv, "vpn",
GNUNET_SERVICE_OPTION_NONE,
- &run, NULL)) ? 0 : 1;
+ &run, NULL)) ? global_ret : 1;
}
/* end of gnunet-service-vpn.c */
projects / oweals / gnunet.git / blobdiff