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Implementation on Windows:
IPv6 conntrack ip fragment feature use a link list to store ip
fragment. When ipv6 fragment module receives a fragment packet,
it will store length of the fragment, until to the received length
equal to the packet length before fragmented, it will reassemble
fragment packet to a complete packet and send the complete packet
to conntrack module. After conntrack processed the packet, fragment
module will divide the complete packet into small fragment and send
it to destination. Currently, ipv6 was implemented in a indenpent
module, for the reason it can reduce the risk of introduce bug to
ipv4 fragmenb module.
Testing Topology:
On the Windows VM runs on the ESXi host, two hyper-v ports attached
to the ovs bridge; one hyper-v port worked as client and the
other port worked as server.
Testing Case:
1.UdpV6
a) UdpV6 fragment with multiple ipv6 extension fields.
b) UdpV6 fragment in normal scenario.
c) UdpV6 fragment in nat scenario.
2.IcmpV6
a) IcmpV6 fragment in normal scenario.
b) IcmpV6 fragment in nat scenario.
Signed-off-by: ldejing <ldejing@vmware.com>
Signed-off-by: Alin-Gabriel Serdean <aserdean@ovn.org>
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As per MSDN documentation, "As soon as a filter driver calls the
NdisFSendNetBufferLists function, it relinquishes ownership of
the NET_BUFFER_LIST structures and all associated resources.
A filter driver should never try to examine the NET_BUFFER_LIST
structures or any associated data after calling NdisFSendNetBufferLists".
https://docs.microsoft.com/en-us/windows-hardware/drivers/ddi/content/ndis/nf-ndis-ndisfsendnetbufferlists
When freeing up memory of a cloned nbl, parent's nbl and context
is being accessed, which is incorrect can cause BSOD.
With this patch, original nbl is sent out only when cloned nbl is done
with packet processing and its memory is freed.
Signed-off-by: Anand Kumar <kumaranand@vmware.com>
Acked-by: Alin Gabriel Serdean <aserdean@ovn.org>
Signed-off-by: Alin Gabriel Serdean <aserdean@ovn.org>
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With current implementation, when nbl pool is allocated, context size is
specified as 64 bytes, while the OVS_BUFFER_CONTEXT size is only 32 bytes.
Since context size is never changed, additional memory is not required.
This patch makes it simpler to allocate memory for OVS_BUFFER_CONTEXT so
that it is always aligned to MEMORY_ALLOCATION_ALIGNMENT.
This is acheived by updating "value" field in the context
structure, so that number of elements in array is always a multiple of
MEMORY_ALLOCATION_ALIGNMENT.
Also change the DEFAULT_CONTEXT_SIZE to accomodate OVS_BUFFER_CONTEXT size.
Signed-off-by: Anand Kumar <kumaranand@vmware.com>
Acked-by: Alin Gabriel Serdean <aserdean@ovn.org>
Signed-off-by: Alin Gabriel Serdean <aserdean@ovn.org>
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Moves function OvsCreateNewNBLsFromMultipleNBs() to BufferMgmt.c
to facilitate consumption from outside PacketIO.c.
Signed-off-by: Shashank Ram <rams@vmware.com>
Acked-by: Anand Kumar <kumaranand@vmware.com>
Acked-by: Alin Gabriel Serdean <aserdean@ovn.org>
Signed-off-by: Alin Gabriel Serdean <aserdean@ovn.org>
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With this patch, OvsTcpSegmentNBL not only supports fragmenting NBL
to TCP segments but also Ipv4 fragments.
To reflect the new changes, renamed function name from OvsTcpSegmentNBL
to OvsFragmentNBL and created a wrapper for OvsTcpSegmentNBL.
Signed-off-by: Anand Kumar <kumaranand@vmware.com>
Signed-off-by: Ben Pfaff <blp@ovn.org>
Acked-by: Alin Gabriel Serdean <aserdean@cloudbasesolutions.com>
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This patch introduces a new field MRU(Maximum Recieved Unit) in the
_OVS_BUFFER_CONTEXT and it is used only for Ip Fragments to retain MRU for
the reassembled IP datagram when the packet is forwarded to userspace.
Signed-off-by: Anand Kumar <kumaranand@vmware.com>
Signed-off-by: Ben Pfaff <blp@ovn.org>
Acked-by: Alin Gabriel Serdean <aserdean@cloudbasesolutions.com>
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The purpose of this patch is to refactor the software offloads found in
the VXLAN and GRE code and also to refactor how the maximmum segment
size for a given NBL is obtained.
This patch introduces two functions OvsApplySWChecksumOnNB and OVSGetTcpMSS.
OVSGetTcpMSS - will return the mss found in a given NBL.
OvsApplySWChecksumOnNB - will compute and set software offloads for a given
NBL.
Signed-off-by: Alin Gabriel Serdean <aserdean@cloudbasesolutions.com>
Acked-by: Sorin Vinturis <svinturis at cloudbasesolutions.com>
Acked-by: Nithin Raju <nithin@vmware.com>
Signed-off-by: Ben Pfaff <blp@ovn.org>
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Move the functionality around creating an NBL from Buffer to
Buffermanagement. This function will be used for converting the buffer
from user-space to NBL and also by STT - reassembly logic.
Signed-off-by: Sairam Venugopal <vsairam@vmware.com>
Acked-by: Nithin Raju <nithin@vmware.com>
Signed-off-by: Gurucharan Shetty <gshetty@nicira.com>
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This patch includes the file renaming and accommodations needed for the file
renaming to build the forwarding extension for Hyper-V.
This patch is also a follow-up for the thread:
http://openvswitch.org/pipermail/dev/2014-August/044005.html
Signed-off-by: Samuel Ghinet <sghinet@cloudbasesolutions.com>
Co-authored-by: Alin Gabriel Serdean <aserdean@cloudbasesolutions.com>
Signed-off-by: Ben Pfaff <blp@nicira.com>
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