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IP forwarding: Add some fragments of TCP forwarding logic.

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This commit is contained in:
Gregory Nutt
2017-07-03 15:58:01 -06:00
parent 81cd76484f
commit 83a875f394
4 changed files with 172 additions and 29 deletions
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net/devif/ipv6_forward.c
+37 -29
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@@ -166,7 +166,7 @@ static int ipv6_packet_conversion(FAR struct net_driver_s *dev,
static int ipv6_hdrsize(FAR struct ipv6_hdr_s *ipv6)
{
/* Copy the following protocol header, */
/* Size is determined by the following protocol header, */
switch (ipv6->proto)
{
@@ -211,27 +211,20 @@ static int ipv6_hdrsize(FAR struct ipv6_hdr_s *ipv6)
* Description:
* Set up to forward the UDP or ICMPv6 packet on the specified device.
* This function will set up a send "interrupt" handler that will perform
* the actual send asynchronously.
* the actual send asynchronously and must return without waiting for the
* send to complete.
*
* Input Parameters:
* dev - The device on which the packet was received and which contains
* the IPv6 packet.
* ipv6 - A convenience pointer to the IPv6 header in within the IPv6
* packet. This is immeidately followed by the L3 header which may
* be UDP or ICMPv6.
* dev - The device on which the packet should be forwarded.
* ipv6 - A pointer to the IPv6 header in within the IPv6 packet. This
* is immeidately followed by the L3 header which may be UDP or
* ICMPv6.
* iob - A list of IOBs containing the data payload to be sent.
*
*
* On input:
* - dev->d_buf holds the received packet.
* - dev->d_len holds the length of the received packet MINUS the
* size of the L1 header. That was subtracted out by ipv6_input.
* - ipv6 points to the IPv6 header with dev->d_buf.
*
* Returned Value:
* Zero is returned if the packet was successfully forward; A negated
* Zero is returned if the packet was successfully forwarded; A negated
* errno value is returned if the packet is not forwardable. In that
* latter case, the caller (ipv6_input()) should drop the packet.
* latter case, the caller should free the IOB list and drop the packet.
*
****************************************************************************/
@@ -242,9 +235,7 @@ static int ipv6_dev_forward(FAR struct net_driver_s *dev,
{
/* Notify the forwarding device that TX data is available */
/* Set up to send the packet when the selected device polls for TX data.
* If the packet is TCP, it must obey ACK and windowing rules.
*/
/* Set up to send the packet when the selected device polls for TX data. */
#warning Missing logic
@@ -252,12 +243,9 @@ static int ipv6_dev_forward(FAR struct net_driver_s *dev,
* - source MAC, the MAC of the current device.
* - dest MAC, the MAC associated with the destination IPv6 adress.
* This will involve ICMPv6 and Neighbor Discovery.
* - Because of TCP window, the packet may have to be sent in smaller
* pieces.
*/
# warning Missing logic
nwarn("WARNING: UPD/ICMPv6 packet forwarding not yet supported\n");
nwarn("WARNING: UPD/ICMPv6 packet forwarding not yet supported\n");
return -ENOSYS;
}
#endif
@@ -280,11 +268,31 @@ static int ipv6_dev_forward(FAR struct net_driver_s *dev,
#ifdef CONFIG_NET_STATISTICS
static void ipv6_dropstats(FAR struct ipv6_hdr_s *ipv)
{
g_netstats.icmpv6.drop++
g_netstats.udp.drop++;
g_netstats.tcp.drop++;
switch (ipv6->proto)
{
#ifdef CONFIG_NET_TCP
case IP_PROTO_TCP:
g_netstats.tcp.drop++;
break;
#endif
g_netstats.ipv6.drop++
#ifdef CONFIG_NET_UDP
case IP_PROTO_UDP:
g_netstats.udp.drop++;
break;
#endif
#ifdef CONFIG_NET_ICMPv6
case IP_PROTO_ICMP6:
g_netstats.icmpv6.drop++
break;
#endif
default:
break;
}
g_netstats.ipv6.drop++
}
#else
# define ipv6_dropstats(ipv6)
@@ -410,11 +418,11 @@ int ipv6_forward(FAR struct net_driver_s *dev, FAR struct ipv6_hdr_s *ipv6)
if (ipv6->proto == IP_PROTO_TCP)
{
ret = tcp_ipv6_forward(dev, ipv6, iob);
ret = tcp_ipv6_forward(fwddev, ipv6, iob);
}
else
{
ret = ipv6_dev_forward(dev, ipv6, iob);
ret = ipv6_dev_forward(fwddev, ipv6, iob);
}
if (ret >= 0)