• Xin Long's avatar
    sctp: implement validate_ftsn for sctp_stream_interleave · 0fc2ea92
    Xin Long authored
    validate_ftsn is added as a member of sctp_stream_interleave, used to
    validate ssn/chunk type for fwdtsn or mid (message id)/chunk type for
    ifwdtsn, called in sctp_sf_eat_fwd_tsn, just as validate_data.
    
    If this check fails, an abort packet will be sent, as said in section
    2.3.1 of RFC8260.
    
    As ifwdtsn and fwdtsn chunks have different length, it also defines
    ftsn_chunk_len for sctp_stream_interleave to describe the chunk size.
    Then it replaces all sizeof(struct sctp_fwdtsn_chunk) with
    sctp_ftsnchk_len.
    
    It also adds the process for ifwdtsn in rx path. As Marcelo pointed
    out, there's no need to add event table for ifwdtsn, but just share
    prsctp_chunk_event_table with fwdtsn's. It would drop fwdtsn chunk
    for ifwdtsn and drop ifwdtsn chunk for fwdtsn by calling validate_ftsn
    in sctp_sf_eat_fwd_tsn.
    
    After this patch, the ifwdtsn can be accepted.
    
    Note that this patch also removes the sctp.intl_enable check for
    idata chunks in sctp_chunk_event_lookup, as it will do this check
    in validate_data later.
    Signed-off-by: default avatarXin Long <lucien.xin@gmail.com>
    Acked-by: default avatarMarcelo R. Leitner <marcelo.leitner@gmail.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    0fc2ea92
sm_statetable.c 33.7 KB