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Subject: Re: [virtio-comment] [PATCH v8] virtio-net: support inner header hash
On Mon, Feb 13, 2023 at 09:05:04PM +0800, Heng Qi wrote: > Hi, all. > > Do you have any comments on this version? > > Thanks. > > å 2023/2/8 äå5:08, Heng Qi åé: > > If the tunnel is used to encapsulate the packets, the hash calculated > > using the outer header of the receive packets is always fixed for the > > same flow packets, i.e. they will be steered to the same receive queue. > > > > We add a feature bit VIRTIO_NET_F_HASH_TUNNEL and related bitmasks > > in \field{hash_tunnel_types}, which instructs the device to calculate the > > hash using the inner headers of tunnel-encapsulated packets. Besides, > > values in \field{hash_report_tunnel_types} are added to report tunnel types. > > > > Note that VIRTIO_NET_F_HASH_TUNNEL only indicates the ability of the inner > > header hash, and does not give the device the ability to use the hash value > > to select a receiving queue to place the packet. > > > > Fixes: https://github.com/oasis-tcs/virtio-spec/issues/151 > > > > Reviewed-by: Jason Wang <jasowang@redhat.com> > > Signed-off-by: Heng Qi <hengqi@linux.alibaba.com> > > Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com> I didn't yes come up with anything convincing for improving security (dos/usage info leak due to queue collisions between tunnels). I'd like to at least have a security considerations section documenting the issue with using RSS with tunneling. In fact it's high time we started adding these sections all over the place. I also found out at least mlx5 has these tunnel offloads, so I'd like to ask nvidia guys here on list - does this cover e.g. mlx5 functionality? e.g. is the tunnel list sufficient? - does mlx5 cover queue collisions between tunnels and if yes how? Thanks! > > --- > > v7->v8: > > 1. Add supported_hash_tunnel_types. @Jason Wang, @Parav Pandit > > 2. Change hash_report_tunnel to hash_report_tunnel_types. @Parav Pandit > > 3. Removed re-definition for inner packet hashing. @Parav Pandit > > 4. Fix some typos. @Michael S . Tsirkin > > 5. Clarify some sentences. @Michael S . Tsirkin > > > > v6->v7: > > 1. Modify the wording of some sentences for clarity. @Michael S. Tsirkin > > 2. Fix some syntax issues. @Michael S. Tsirkin > > > > v5->v6: > > 1. Fix some syntax and capitalization issues. @Michael S. Tsirkin > > 2. Use encapsulated/encaptulation uniformly. @Michael S. Tsirkin > > 3. Move the links to introduction section. @Michael S. Tsirkin > > 4. Clarify some sentences. @Michael S. Tsirkin > > > > v4->v5: > > 1. Clarify some paragraphs. @Cornelia Huck > > 2. Fix the u8 type. @Cornelia Huck > > > > v3->v4: > > 1. Rename VIRTIO_NET_F_HASH_GRE_VXLAN_GENEVE_INNER to VIRTIO_NET_F_HASH_TUNNEL. @Jason Wang > > 2. Make things clearer. @Jason Wang @Michael S. Tsirkin > > 3. Keep the possibility to use inner hash for automatic receive steering. @Jason Wang > > 4. Add the "Tunnel packet" paragraph to avoid repeating the GRE etc. many times. @Michael S. Tsirkin > > > > v2->v3: > > 1. Add a feature bit for GRE/VXLAN/GENEVE inner hash. @Jason Wang > > 2. Chang \field{hash_tunnel} to \field{hash_report_tunnel}. @Jason Wang, @Michael S. Tsirkin > > > > v1->v2: > > 1. Remove the patch for the bitmask fix. @Michael S. Tsirkin > > 2. Clarify some paragraphs. @Jason Wang > > 3. Add \field{hash_tunnel} and VIRTIO_NET_HASH_REPORT_GRE. @Yuri Benditovich > > > > content.tex | 135 ++++++++++++++++++++++++++++++++++++++++++----- > > introduction.tex | 19 +++++++ > > 2 files changed, 140 insertions(+), 14 deletions(-) > > > > diff --git a/content.tex b/content.tex > > index e863709..2598d96 100644 > > --- a/content.tex > > +++ b/content.tex > > @@ -3084,6 +3084,9 @@ \subsection{Feature bits}\label{sec:Device Types / Network Device / Feature bits > > \item[VIRTIO_NET_F_CTRL_MAC_ADDR(23)] Set MAC address through control > > channel. > > +\item[VIRTIO_NET_F_HASH_TUNNEL(52)] Device supports inner header hash > > + for tunnel-encapsulated packets. > > + > > \item[VIRTIO_NET_F_NOTF_COAL(53)] Device supports notifications coalescing. > > \item[VIRTIO_NET_F_GUEST_USO4 (54)] Driver can receive USOv4 packets. > > @@ -3095,7 +3098,8 @@ \subsection{Feature bits}\label{sec:Device Types / Network Device / Feature bits > > to several segments when each of these smaller packets has UDP header. > > \item[VIRTIO_NET_F_HASH_REPORT(57)] Device can report per-packet hash > > - value and a type of calculated hash. > > + value, a type of calculated hash, and, if VIRTIO_NET_F_HASH_TUNNEL > > + is negotiated, an encapsulation packet type. > > \item[VIRTIO_NET_F_GUEST_HDRLEN(59)] Driver can provide the exact \field{hdr_len} > > value. Device benefits from knowing the exact header length. > > @@ -3140,6 +3144,7 @@ \subsubsection{Feature bit requirements}\label{sec:Device Types / Network Device > > \item[VIRTIO_NET_F_NOTF_COAL] Requires VIRTIO_NET_F_CTRL_VQ. > > \item[VIRTIO_NET_F_RSC_EXT] Requires VIRTIO_NET_F_HOST_TSO4 or VIRTIO_NET_F_HOST_TSO6. > > \item[VIRTIO_NET_F_RSS] Requires VIRTIO_NET_F_CTRL_VQ. > > +\item[VIRTIO_NET_F_HASH_TUNNEL] Requires VIRTIO_NET_F_CTRL_VQ. > > \end{description} > > \subsubsection{Legacy Interface: Feature bits}\label{sec:Device Types / Network Device / Feature bits / Legacy Interface: Feature bits} > > @@ -3199,20 +3204,27 @@ \subsection{Device configuration layout}\label{sec:Device Types / Network Device > > u8 rss_max_key_size; > > le16 rss_max_indirection_table_length; > > le32 supported_hash_types; > > + le32 supported_tunnel_hash_types; > > }; > > \end{lstlisting} > > -The following field, \field{rss_max_key_size} only exists if VIRTIO_NET_F_RSS or VIRTIO_NET_F_HASH_REPORT is set. > > +The following field, \field{rss_max_key_size} only exists if VIRTIO_NET_F_RSS, VIRTIO_NET_F_HASH_REPORT or VIRTIO_NET_F_HASH_TUNNEL is set. > > It specifies the maximum supported length of RSS key in bytes. > > The following field, \field{rss_max_indirection_table_length} only exists if VIRTIO_NET_F_RSS is set. > > It specifies the maximum number of 16-bit entries in RSS indirection table. > > The next field, \field{supported_hash_types} only exists if the device supports hash calculation, > > -i.e. if VIRTIO_NET_F_RSS or VIRTIO_NET_F_HASH_REPORT is set. > > +i.e. if VIRTIO_NET_F_RSS, VIRTIO_NET_F_HASH_REPORT or VIRTIO_NET_F_HASH_TUNNEL is set. > > Field \field{supported_hash_types} contains the bitmask of supported hash types. > > See \ref{sec:Device Types / Network Device / Device Operation / Processing of Incoming Packets / Hash calculation for incoming packets / Supported/enabled hash types} for details of supported hash types. > > +The next field, \field{supported_tunnel_hash_types} only exists if the device > > +supports inner hash calculation, i.e. if VIRTIO_NET_F_HASH_TUNNEL is set. > > + > > +Field \field{supported_tunnel_hash_types} contains the bitmask of supported tunnel hash types. > > +See \ref{sec:Device Types / Network Device / Device Operation / Processing of Incoming Packets / Hash calculation for incoming packets / Supported/enabled tunnel hash types} for details of supported tunnel hash types. > > + > > \devicenormative{\subsubsection}{Device configuration layout}{Device Types / Network Device / Device configuration layout} > > The device MUST set \field{max_virtqueue_pairs} to between 1 and 0x8000 inclusive, > > @@ -3236,7 +3248,7 @@ \subsection{Device configuration layout}\label{sec:Device Types / Network Device > > negotiated. > > The device MUST set \field{rss_max_key_size} to at least 40, if it offers > > -VIRTIO_NET_F_RSS or VIRTIO_NET_F_HASH_REPORT. > > +VIRTIO_NET_F_RSS, VIRTIO_NET_F_HASH_REPORT or VIRTIO_NET_F_HASH_TUNNEL. > > The device MUST set \field{rss_max_indirection_table_length} to at least 128, if it offers > > VIRTIO_NET_F_RSS. > > @@ -3384,9 +3396,10 @@ \subsection{Device Operation}\label{sec:Device Types / Network Device / Device O > > le16 csum_start; > > le16 csum_offset; > > le16 num_buffers; > > - le32 hash_value; (Only if VIRTIO_NET_F_HASH_REPORT negotiated) > > - le16 hash_report; (Only if VIRTIO_NET_F_HASH_REPORT negotiated) > > - le16 padding_reserved; (Only if VIRTIO_NET_F_HASH_REPORT negotiated) > > + le32 hash_value; (Only if VIRTIO_NET_F_HASH_REPORT negotiated) > > + le16 hash_report; (Only if VIRTIO_NET_F_HASH_REPORT negotiated) > > + u8 hash_report_tunnel_types; (Only if VIRTIO_NET_F_HASH_REPORT negotiated, only valid if VIRTIO_NET_F_HASH_TUNNEL negotiated, otherwise reserved) > > + u8 padding_reserved; (Only if VIRTIO_NET_F_HASH_REPORT negotiated) > > }; > > \end{lstlisting} > > @@ -3838,11 +3851,15 @@ \subsubsection{Processing of Incoming Packets}\label{sec:Device Types / Network > > \begin{itemize} > > \item The feature VIRTIO_NET_F_RSS was negotiated. The device uses the hash to determine the receive virtqueue to place incoming packets. > > \item The feature VIRTIO_NET_F_HASH_REPORT was negotiated. The device reports the hash value and the hash type with the packet. > > + If additionally VIRTIO_NET_F_HASH_TUNNEL was negotiated, the device reports the encapsulation type as well. > > +\item The feature VIRTIO_NET_F_HASH_TUNNEL was negotiated. The device supports inner hash calculation. > > \end{itemize} > > If the feature VIRTIO_NET_F_RSS was negotiated: > > \begin{itemize} > > \item The device uses \field{hash_types} of the virtio_net_rss_config structure as 'Enabled hash types' bitmask. > > + If additionally VIRTIO_NET_F_HASH_TUNNEL was negotiated, the device uses \field{hash_tunnel_types} of the > > + virtio_net_rss_config structure as 'Enabled hash tunnel types' bitmask. > > \item The device uses a key as defined in \field{hash_key_data} and \field{hash_key_length} of the virtio_net_rss_config structure (see > > \ref{sec:Device Types / Network Device / Device Operation / Control Virtqueue / Receive-side scaling (RSS) / Setting RSS parameters}). > > \end{itemize} > > @@ -3850,11 +3867,13 @@ \subsubsection{Processing of Incoming Packets}\label{sec:Device Types / Network > > If the feature VIRTIO_NET_F_RSS was not negotiated: > > \begin{itemize} > > \item The device uses \field{hash_types} of the virtio_net_hash_config structure as 'Enabled hash types' bitmask. > > + If additionally VIRTIO_NET_F_HASH_TUNNEL was negotiated, the device uses \field{hash_tunnel_types} of the > > + virtio_net_hash_config structure as 'Enabled hash tunnel types' bitmask. > > \item The device uses a key as defined in \field{hash_key_data} and \field{hash_key_length} of the virtio_net_hash_config structure (see > > \ref{sec:Device Types / Network Device / Device Operation / Control Virtqueue / Automatic receive steering in multiqueue mode / Hash calculation}). > > \end{itemize} > > -Note that if the device offers VIRTIO_NET_F_HASH_REPORT, even if it supports only one pair of virtqueues, it MUST support > > +Note that if the device offers VIRTIO_NET_F_HASH_REPORT or VIRTIO_NET_F_HASH_TUNNEL, even if it supports only one pair of virtqueues, it MUST support > > at least one of commands of VIRTIO_NET_CTRL_MQ class to configure reported hash parameters: > > \begin{itemize} > > \item If the device offers VIRTIO_NET_F_RSS, it MUST support VIRTIO_NET_CTRL_MQ_RSS_CONFIG command per > > @@ -3863,8 +3882,37 @@ \subsubsection{Processing of Incoming Packets}\label{sec:Device Types / Network > > \ref{sec:Device Types / Network Device / Device Operation / Control Virtqueue / Automatic receive steering in multiqueue mode / Hash calculation}. > > \end{itemize} > > +\subparagraph{Tunnel/Encapsulated packet} > > +\label{sec:Device Types / Network Device / Device Operation / Processing of Incoming Packets / Hash calculation for incoming packets / Tunnel/Encapsulated packet} > > +A tunnel packet is encapsulated from the original packet based on the tunneling > > +protocol (only a single level of encapsulation is currently supported). The > > +encapsulated packet contains an outer header and an inner header, and the device > > +calculates the hash over either the inner header or the outer header. > > + > > +When the feature VIRTIO_NET_F_HASH_TUNNEL is negotiated and the corresponding > > +encapsulation type is set in \field{hash_tunnel_types}, the hash for a specific > > +type of encapsulated packet is calculated over the inner as opposed to outer header. > > +Supported encapsulation types are listed in \ref{sec:Device Types / Network Device / > > +Device Operation / Processing of Incoming Packets / Hash calculation for incoming packets / > > +Supported/enabled hash tunnel types}. > > + > > +If both VIRTIO_NET_F_HASH_REPORT and VIRTIO_NET_F_HASH_TUNNEL are negotiated, > > +and the corresponding encapsulation type is set in \field{hash_tunnel_types}, > > +the device supports inner hash calculation for the encapsulated packet, > > +For example, if the encapsulated packets \hyperref[intro:GRE]{[GRE]}, > > +\hyperref[intro:VXLAN]{[VXLAN]} and \hyperref[intro:GENEVE]{[GENEVE]} are hashed in inner > > +headers, then \field{hash_tunnel_types} should be set to VIRTIO_NET_HASH_TUNNEL_TYPE_{GRE, VXLAN, GENEVE} > > +respectively, and \field{hash_report_tunnel_types} should be respectively set to > > +VIRTIO_NET_HASH_TUNNEL_REPORT_{GRE, VXLAN, GENEVE}. > > + > > +If VIRTIO_NET_F_HASH_REPORT is negotiated but VIRTIO_NET_F_HASH_TUNNEL is not > > +negotiated, the device calculates the hash over the outer header, and \field{hash_report} > > +reports the hash type. \field{hash_report_tunnel_types} is no longer valid. > > + > > \subparagraph{Supported/enabled hash types} > > \label{sec:Device Types / Network Device / Device Operation / Processing of Incoming Packets / Hash calculation for incoming packets / Supported/enabled hash types} > > +This paragraph relies on definitions from \hyperref[intro:IP]{[IP]}, > > +\hyperref[intro:UDP]{[UDP]} and \hyperref[intro:TCP]{[TCP]}. > > Hash types applicable for IPv4 packets: > > \begin{lstlisting} > > #define VIRTIO_NET_HASH_TYPE_IPv4 (1 << 0) > > @@ -3884,6 +3932,24 @@ \subsubsection{Processing of Incoming Packets}\label{sec:Device Types / Network > > #define VIRTIO_NET_HASH_TYPE_UDP_EX (1 << 8) > > \end{lstlisting} > > +\subparagraph{Supported/enabled tunnel hash types} > > +\label{sec:Device Types / Network Device / Device Operation / Processing of Incoming Packets / Hash calculation for incoming packets / Supported/enabled tunnel hash types} > > +If the feature VIRTIO_NET_F_HASH_TUNNEL is negotiated, the encapsulation > > +hash type indicates that the hash is calculated over the inner header of > > +the encapsulated packet: > > +Hash type applicable for inner payload of the gre-encapsulated packet > > +\begin{lstlisting} > > +#define VIRTIO_NET_HASH_TUNNEL_TYPE_GRE (1 << 0) > > +\end{lstlisting} > > +Hash type applicable for inner payload of the vxlan-encapsulated packet > > +\begin{lstlisting} > > +#define VIRTIO_NET_HASH_TUNNEL_TYPE_VXLAN (1 << 1) > > +\end{lstlisting} > > +Hash type applicable for inner payload of the geneve-encapsulated packet > > +\begin{lstlisting} > > +#define VIRTIO_NET_HASH_TUNNEL_TYPE_GENEVE (1 << 2) > > +\end{lstlisting} > > + > > \subparagraph{IPv4 packets} > > \label{sec:Device Types / Network Device / Device Operation / Processing of Incoming Packets / Hash calculation for incoming packets / IPv4 packets} > > The device calculates the hash on IPv4 packets according to 'Enabled hash types' bitmask as follows: > > @@ -3975,15 +4041,26 @@ \subsubsection{Processing of Incoming Packets}\label{sec:Device Types / Network > > (see \ref{sec:Device Types / Network Device / Device Operation / Processing of Incoming Packets / Hash calculation for incoming packets / IPv6 packets without extension header}). > > \end{itemize} > > +\subparagraph{Inner hash calculation of an encapsulated packet} > > +If the feature VIRTIO_NET_F_HASH_TUNNEL is negotiated and the corresponding > > +encapsulation hash type is set in \field{hash_tunnel_types}, the device calculates the > > +hash on the inner header of an encapsulated packet (See \ref{sec:Device Types > > +/ Network Device / Device Operation / Processing of Incoming Packets / > > +Hash calculation for incoming packets / Tunnel/Encapsulated packet}), and > > +\field{hash_report_tunnel_types} contains the valid outer tunnel type. > > + > > \paragraph{Hash reporting for incoming packets} > > \label{sec:Device Types / Network Device / Device Operation / Processing of Incoming Packets / Hash reporting for incoming packets} > > - > > -If VIRTIO_NET_F_HASH_REPORT was negotiated and > > - the device has calculated the hash for the packet, the device fills \field{hash_report} with the report type of calculated hash > > -and \field{hash_value} with the value of calculated hash. > > +If VIRTIO_NET_F_HASH_REPORT was negotiated and the device has calculated the > > +hash for the packet, the device fills \field{hash_report} with the report type > > +of calculated hash, and \field{hash_value} with the value of calculated hash. > > +Also, if VIRTIO_NET_F_HASH_TUNNEL was negotiated, the device needs to fill > > +\field{hash_report_tunnel_types} with the report type of the encapsulated packet, > > +and it is set to VIRTIO_NET_HASH_TUNNEL_REPORT_NONE for the unencapsulated packet. > > If VIRTIO_NET_F_HASH_REPORT was negotiated but due to any reason the > > -hash was not calculated, the device sets \field{hash_report} to VIRTIO_NET_HASH_REPORT_NONE. > > +hash was not calculated, the device sets \field{hash_report} to VIRTIO_NET_HASH_REPORT_NONE, > > +and sets \field{hash_report_tunnel_types} to VIRTIO_NET_HASH_TUNNEL_REPORT_NONE. > > Possible values that the device can report in \field{hash_report} are defined below. > > They correspond to supported hash types defined in > > @@ -4005,6 +4082,26 @@ \subsubsection{Processing of Incoming Packets}\label{sec:Device Types / Network > > #define VIRTIO_NET_HASH_REPORT_UDPv6_EX 9 > > \end{lstlisting} > > +\field{hash_report_tunnel} can report the type of the encapsulated > > +packet to the driver when the inner header hash is calculated. > > +Possible values that the device can report in \field{hash_report_tunnel_types} > > +are defined below. > > +They correspond to supported hash tunnel types defined in > > +\ref{sec:Device Types / Network Device / Device Operation / Processing of Incoming Packets / Hash calculation for incoming packets / Supported/enabled hash tunnel types} > > +as follows: > > + > > +VIRTIO_NET_HASH_TUNNEL_TYPE_XXX = 1 << (VIRTIO_NET_HASH_TUNNEL_REPORT_XXX -1) > > + > > +\begin{lstlisting} > > +#define VIRTIO_NET_HASH_TUNNEL_REPORT_NONE 0 > > +#define VIRTIO_NET_HASH_TUNNEL_REPORT_GRE 1 > > +#define VIRTIO_NET_HASH_TUNNEL_REPORT_VXLAN 2 > > +#define VIRTIO_NET_HASH_TUNNEL_REPORT_GENEVE 3 > > +\end{lstlisting} > > + > > +They correspond to supported hash types defined in > > +\ref{sec:Device Types / Network Device / Device Operation / Processing of Incoming Packets / Hash calculation for incoming packets / Supported/enabled hash types}. > > + > > \subsubsection{Control Virtqueue}\label{sec:Device Types / Network Device / Device Operation / Control Virtqueue} > > The driver uses the control virtqueue (if VIRTIO_NET_F_CTRL_VQ is > > @@ -4364,6 +4461,7 @@ \subsubsection{Control Virtqueue}\label{sec:Device Types / Network Device / Devi > > \begin{lstlisting} > > struct virtio_net_hash_config { > > le32 hash_types; > > + le32 hash_tunnel_types; > > le16 reserved[4]; > > u8 hash_key_length; > > u8 hash_key_data[hash_key_length]; > > @@ -4372,7 +4470,12 @@ \subsubsection{Control Virtqueue}\label{sec:Device Types / Network Device / Devi > > Field \field{hash_types} contains a bitmask of allowed hash types as > > defined in > > \ref{sec:Device Types / Network Device / Device Operation / Processing of Incoming Packets / Hash calculation for incoming packets / Supported/enabled hash types}. > > -Initially the device has all hash types disabled and reports only VIRTIO_NET_HASH_REPORT_NONE. > > + > > +Field \field{hash_tunnel_types} contains a bitmask of allowed hash tunnel types as > > +defined in \ref{sec:Device Types / Network Device / Device Operation / Processing of Incoming Packets / Hash calculation for incoming packets / Supported/enabled hash tunnel types}. > > + > > +Initially the device has all hash types and hash tunnel types disabled and reports only > > +VIRTIO_NET_HASH_REPORT_NONE and VIRTIO_NET_HASH_TUNNEL_REPORT_NONE respectively. > > Field \field{reserved} MUST contain zeroes. It is defined to make the structure to match the layout of virtio_net_rss_config structure, > > defined in \ref{sec:Device Types / Network Device / Device Operation / Control Virtqueue / Receive-side scaling (RSS)}. > > @@ -4390,6 +4493,7 @@ \subsubsection{Control Virtqueue}\label{sec:Device Types / Network Device / Devi > > \begin{lstlisting} > > struct virtio_net_rss_config { > > le32 hash_types; > > + le32 hash_tunnel_types; > > le16 indirection_table_mask; > > le16 unclassified_queue; > > le16 indirection_table[indirection_table_length]; > > @@ -4402,6 +4506,9 @@ \subsubsection{Control Virtqueue}\label{sec:Device Types / Network Device / Devi > > defined in > > \ref{sec:Device Types / Network Device / Device Operation / Processing of Incoming Packets / Hash calculation for incoming packets / Supported/enabled hash types}. > > +Field \field{hash_tunnel_types} contains a bitmask of allowed hash tunnel types as > > +defined in \ref{sec:Device Types / Network Device / Device Operation / Processing of Incoming Packets / Hash calculation for incoming packets / Supported/enabled hash tunnel types}. > > + > > Field \field{indirection_table_mask} is a mask to be applied to > > the calculated hash to produce an index in the > > \field{indirection_table} array. > > diff --git a/introduction.tex b/introduction.tex > > index 287c5fc..ff01a9b 100644 > > --- a/introduction.tex > > +++ b/introduction.tex > > @@ -98,6 +98,25 @@ \section{Normative References}\label{sec:Normative References} > > \phantomsection\label{intro:SEC1}\textbf{[SEC1]} & > > Standards for Efficient Cryptography Group(SECG), ``SEC1: Elliptic Cureve Cryptography'', Version 1.0, September 2000. > > \newline\url{https://www.secg.org/sec1-v2.pdf}\\ > > + \phantomsection\label{intro:GRE}\textbf{[GRE]} & > > + Generic Routing Encapsulation > > + \newline\url{https://datatracker.ietf.org/doc/rfc2784/}\\ > > + \phantomsection\label{intro:VXLAN}\textbf{[VXLAN]} & > > + Virtual eXtensible Local Area Network > > + \newline\url{https://datatracker.ietf.org/doc/rfc7348/}\\ > > + \phantomsection\label{intro:GENEVE}\textbf{[GENEVE]} & > > + Generic Network Virtualization Encapsulation > > + \newline\url{https://datatracker.ietf.org/doc/rfc8926/}\\ > > + \phantomsection\label{intro:IP}\textbf{[IP]} & > > + INTERNET PROTOCOL > > + \newline\url{https://www.rfc-editor.org/rfc/rfc791}\\ > > + \phantomsection\label{intro:UDP}\textbf{[UDP]} & > > + User Datagram Protocol > > + \newline\url{https://www.rfc-editor.org/rfc/rfc768}\\ > > + \phantomsection\label{intro:TCP}\textbf{[TCP]} & > > + TRANSMISSION CONTROL PROTOCOL > > + \newline\url{https://www.rfc-editor.org/rfc/rfc793}\\ > > + > > \end{longtable}
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