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IPv6 Segment Routing Header (SRH) contains a list of SIDs to be crossed by SR encapsulated packet. Each SID is encoded as an IPv6 prefix. When a Firewall receives an SR encapsulated packet, it should be able to identify which node previously processed the packet (previous SID), which node is going to process the packet next (next SID), and which node is the last to process the packet (last SID) which represent the final destination of the packet in case of inline SR mode. An example use-case of using these features could be SID list that includes two firewalls. When the second firewall receives a packet, it can check whether the packet has been processed by the first firewall or not. Based on that check, it decides to apply all rules, apply just subset of the rules, or totally skip all rules and forward the packet to the next SID. This patch extends SRH match to support matching previous SID, next SID, and last SID. Signed-off-by: Ahmed Abdelsalam <amsalam20@gmail.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org> |
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