Commits on Dec 18, 2020

1. eBPF helper function for attribute search in the netlink message …

   There are few network applications relying on Netlink subsystem to get
   notifications for net-device attribute changes like MTU, Speed,
   Oper-Status, Name, slave, slave info, etc. The Netlink subsystem
   notifies the application on every attribute change regardless of what
   is needed for the application. The attribute search support in
   EBPF filter helps to filter the Netlink packets based on the specific
   set of attributes that are needed for the application.
   
   The classical BPF supports attribute search but that doesn't support
   MAPS. The extended BPF supports MAPS, but the attribute search is not
   enabled. Hence this patch enables the support for attribute search in
   EBPF.
   
   This patch adds the support for following helper function.
       FN(skb_get_nlattr),
       FN(skb_get_nlattr_nest)
   
   skb_get_nlattr:
       Find a specific attribute in a stream of attributes
   
   skb_get_nlattr_nest:
       Find a specific attribute in a stream of nested attributes

   

   Kalimuthu-Velappan committed Dec 18, 2020
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