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lguohan avatar lguohan commented on July 17, 2024

for IP in IP gre tunneling, gre key is an optional field. see rfc2890

  1. Extensions to GRE Header

    The GRE packet header[1] has the following format:

    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |C|       Reserved0       | Ver |         Protocol Type         |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |      Checksum (optional)      |       Reserved1 (Optional)    |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    
    The proposed GRE header will have the following format:
    
    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |C| |K|S| Reserved0       | Ver |         Protocol Type         |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |      Checksum (optional)      |       Reserved1 (Optional)    |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |                         Key (optional)                        |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |                 Sequence Number (Optional)                    |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    

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kcudnik avatar kcudnik commented on July 17, 2024

Then this is "stacked" attribute dependency SAI_TUNNEL_ATTR_ENCAP_GRE_KEY_VALID depend on SAI_TUNNEL_ATTR_TYPE and SAI_TUNNEL_ATTR_ENCAP_GRE_KEY_VALID depend on SAI_TUNNEL_ATTR_ENCAP_GRE_KEY_VALID

In the GRE header if K flag is set to zero, does it mean that Key field is not sent over channel? and after Reserved1 comes Sequence Number? or Key also passes but it's value is unspecified ?

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