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848f3c0d47
The NEXT-C-SID mechanism described in [1] offers the possibility of
encoding several SRv6 segments within a single 128 bit SID address. Such
a SID address is called a Compressed SID (C-SID) container. In this way,
the length of the SID List can be drastically reduced.
A SID instantiated with the NEXT-C-SID flavor considers an IPv6 address
logically structured in three main blocks: i) Locator-Block; ii)
Locator-Node Function; iii) Argument.
C-SID container
+------------------------------------------------------------------+
| Locator-Block |Loc-Node| Argument |
| |Function| |
+------------------------------------------------------------------+
<--------- B -----------> <- NF -> <------------- A --------------->
(i) The Locator-Block can be any IPv6 prefix available to the provider;
(ii) The Locator-Node Function represents the node and the function to
be triggered when a packet is received on the node;
(iii) The Argument carries the remaining C-SIDs in the current C-SID
container.
The NEXT-C-SID mechanism relies on the "flavors" framework defined in
[2]. The flavors represent additional operations that can modify or
extend a subset of the existing behaviors.
This patch introduces the support for flavors in SRv6 End behavior
implementing the NEXT-C-SID one. An SRv6 End behavior with NEXT-C-SID
flavor works as an End behavior but it is capable of processing the
compressed SID List encoded in C-SID containers.
An SRv6 End behavior with NEXT-C-SID flavor can be configured to support
user-provided Locator-Block and Locator-Node Function lengths. In this
implementation, such lengths must be evenly divisible by 8 (i.e. must be
byte-aligned), otherwise the kernel informs the user about invalid
values with a meaningful error code and message through netlink_ext_ack.
If Locator-Block and/or Locator-Node Function lengths are not provided
by the user during configuration of an SRv6 End behavior instance with
NEXT-C-SID flavor, the kernel will choose their default values i.e.,
32-bit Locator-Block and 16-bit Locator-Node Function.
[1] - https://datatracker.ietf.org/doc/html/draft-ietf-spring-srv6-srh-compression
[2] - https://datatracker.ietf.org/doc/html/rfc8986
Signed-off-by: Andrea Mayer <andrea.mayer@uniroma2.it>
Reviewed-by: David Ahern <dsahern@kernel.org>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
137 lines
3.8 KiB
C
137 lines
3.8 KiB
C
/*
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* SR-IPv6 implementation
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*
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* Author:
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* David Lebrun <david.lebrun@uclouvain.be>
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*
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#ifndef _UAPI_LINUX_SEG6_LOCAL_H
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#define _UAPI_LINUX_SEG6_LOCAL_H
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#include <linux/seg6.h>
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enum {
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SEG6_LOCAL_UNSPEC,
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SEG6_LOCAL_ACTION,
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SEG6_LOCAL_SRH,
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SEG6_LOCAL_TABLE,
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SEG6_LOCAL_NH4,
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SEG6_LOCAL_NH6,
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SEG6_LOCAL_IIF,
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SEG6_LOCAL_OIF,
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SEG6_LOCAL_BPF,
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SEG6_LOCAL_VRFTABLE,
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SEG6_LOCAL_COUNTERS,
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SEG6_LOCAL_FLAVORS,
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__SEG6_LOCAL_MAX,
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};
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#define SEG6_LOCAL_MAX (__SEG6_LOCAL_MAX - 1)
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enum {
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SEG6_LOCAL_ACTION_UNSPEC = 0,
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/* node segment */
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SEG6_LOCAL_ACTION_END = 1,
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/* adjacency segment (IPv6 cross-connect) */
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SEG6_LOCAL_ACTION_END_X = 2,
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/* lookup of next seg NH in table */
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SEG6_LOCAL_ACTION_END_T = 3,
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/* decap and L2 cross-connect */
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SEG6_LOCAL_ACTION_END_DX2 = 4,
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/* decap and IPv6 cross-connect */
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SEG6_LOCAL_ACTION_END_DX6 = 5,
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/* decap and IPv4 cross-connect */
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SEG6_LOCAL_ACTION_END_DX4 = 6,
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/* decap and lookup of DA in v6 table */
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SEG6_LOCAL_ACTION_END_DT6 = 7,
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/* decap and lookup of DA in v4 table */
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SEG6_LOCAL_ACTION_END_DT4 = 8,
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/* binding segment with insertion */
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SEG6_LOCAL_ACTION_END_B6 = 9,
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/* binding segment with encapsulation */
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SEG6_LOCAL_ACTION_END_B6_ENCAP = 10,
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/* binding segment with MPLS encap */
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SEG6_LOCAL_ACTION_END_BM = 11,
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/* lookup last seg in table */
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SEG6_LOCAL_ACTION_END_S = 12,
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/* forward to SR-unaware VNF with static proxy */
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SEG6_LOCAL_ACTION_END_AS = 13,
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/* forward to SR-unaware VNF with masquerading */
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SEG6_LOCAL_ACTION_END_AM = 14,
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/* custom BPF action */
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SEG6_LOCAL_ACTION_END_BPF = 15,
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/* decap and lookup of DA in v4 or v6 table */
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SEG6_LOCAL_ACTION_END_DT46 = 16,
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__SEG6_LOCAL_ACTION_MAX,
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};
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#define SEG6_LOCAL_ACTION_MAX (__SEG6_LOCAL_ACTION_MAX - 1)
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enum {
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SEG6_LOCAL_BPF_PROG_UNSPEC,
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SEG6_LOCAL_BPF_PROG,
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SEG6_LOCAL_BPF_PROG_NAME,
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__SEG6_LOCAL_BPF_PROG_MAX,
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};
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#define SEG6_LOCAL_BPF_PROG_MAX (__SEG6_LOCAL_BPF_PROG_MAX - 1)
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/* SRv6 Behavior counters are encoded as netlink attributes guaranteeing the
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* correct alignment.
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* Each counter is identified by a different attribute type (i.e.
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* SEG6_LOCAL_CNT_PACKETS).
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*
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* - SEG6_LOCAL_CNT_PACKETS: identifies a counter that counts the number of
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* packets that have been CORRECTLY processed by an SRv6 Behavior instance
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* (i.e., packets that generate errors or are dropped are NOT counted).
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*
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* - SEG6_LOCAL_CNT_BYTES: identifies a counter that counts the total amount
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* of traffic in bytes of all packets that have been CORRECTLY processed by
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* an SRv6 Behavior instance (i.e., packets that generate errors or are
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* dropped are NOT counted).
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*
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* - SEG6_LOCAL_CNT_ERRORS: identifies a counter that counts the number of
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* packets that have NOT been properly processed by an SRv6 Behavior instance
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* (i.e., packets that generate errors or are dropped).
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*/
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enum {
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SEG6_LOCAL_CNT_UNSPEC,
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SEG6_LOCAL_CNT_PAD, /* pad for 64 bits values */
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SEG6_LOCAL_CNT_PACKETS,
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SEG6_LOCAL_CNT_BYTES,
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SEG6_LOCAL_CNT_ERRORS,
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__SEG6_LOCAL_CNT_MAX,
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};
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#define SEG6_LOCAL_CNT_MAX (__SEG6_LOCAL_CNT_MAX - 1)
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/* SRv6 End* Flavor attributes */
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enum {
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SEG6_LOCAL_FLV_UNSPEC,
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SEG6_LOCAL_FLV_OPERATION,
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SEG6_LOCAL_FLV_LCBLOCK_BITS,
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SEG6_LOCAL_FLV_LCNODE_FN_BITS,
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__SEG6_LOCAL_FLV_MAX,
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};
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#define SEG6_LOCAL_FLV_MAX (__SEG6_LOCAL_FLV_MAX - 1)
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/* Designed flavor operations for SRv6 End* Behavior */
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enum {
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SEG6_LOCAL_FLV_OP_UNSPEC,
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SEG6_LOCAL_FLV_OP_PSP,
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SEG6_LOCAL_FLV_OP_USP,
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SEG6_LOCAL_FLV_OP_USD,
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SEG6_LOCAL_FLV_OP_NEXT_CSID,
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__SEG6_LOCAL_FLV_OP_MAX
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};
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#define SEG6_LOCAL_FLV_OP_MAX (__SEG6_LOCAL_FLV_OP_MAX - 1)
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#endif
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