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/etc/bash_completion.d/tcpdump is in bash-completion 1:1.3-1ubuntu8.

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The actual contents of the file can be viewed below.

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# bash completion for tcpdump

have tcpdump &&
_tcpdump()
{
    local cur prev

    COMPREPLY=()
    _get_comp_words_by_ref cur prev

    case $prev in
        -r|-w|-F)
            _filedir
            return 0
            ;;
        -i)
            _available_interfaces -a
            return 0
            ;;
    esac


    if [[ "$cur" == -* ]]; then
        COMPREPLY=( $( compgen -W '-a -d -e -f -l -n -N -O -p \
            -q -R -S -t -u -v -x -C -F -i -m -r -s -T -w -E' -- "$cur" ) )
    fi

} &&
complete -F _tcpdump tcpdump

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