• David Lebrun's avatar
    ipv6: sr: add core files for SR HMAC support · bf355b8d
    David Lebrun authored
    This patch adds the necessary functions to compute and check the HMAC signature
    of an SR-enabled packet. Two HMAC algorithms are supported: hmac(sha1) and
    hmac(sha256).
    
    In order to avoid dynamic memory allocation for each HMAC computation,
    a per-cpu ring buffer is allocated for this purpose.
    
    A new per-interface sysctl called seg6_require_hmac is added, allowing a
    user-defined policy for processing HMAC-signed SR-enabled packets.
    A value of -1 means that the HMAC field will always be ignored.
    A value of 0 means that if an HMAC field is present, its validity will
    be enforced (the packet is dropped is the signature is incorrect).
    Finally, a value of 1 means that any SR-enabled packet that does not
    contain an HMAC signature or whose signature is incorrect will be dropped.
    Signed-off-by: default avatarDavid Lebrun <david.lebrun@uclouvain.be>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    bf355b8d
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