Commit f0681d95 authored by Daniel T. Lee's avatar Daniel T. Lee Committed by David S. Miller
Browse files

samples: pktgen: add helper functions for IP(v4/v6) CIDR parsing 



This commit adds CIDR parsing and IP validate helper function to parse
single IP or range of IP with CIDR. (e.g. 198.18.0.0/15)

Validating the address should be preceded prior to the parsing.
Helpers will be used in prior to set target address in samples/pktgen.

Signed-off-by: default avatarDaniel T. Lee <danieltimlee@gmail.com>
Acked-by: default avatarJesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 3cad8f91

samples/pktgen/functions.sh

+134 −3
Original line number Diff line number Diff line
@@ -168,6 +168,137 @@ function get_node_cpus() 
	echo $node_cpu_list

}



# Check $1 is in between $2, $3 ($2 <= $1 <= $3)

function in_between() { [[ ($1 -ge $2) && ($1 -le $3) ]] ; }



# Extend shrunken IPv6 address.

# fe80::42:bcff:fe84:e10a => fe80:0:0:0:42:bcff:fe84:e10a

function extend_addr6()

{

    local addr=$1

    local sep=: sep2=::

    local sep_cnt=$(tr -cd $sep <<< $1 | wc -c)

    local shrink



    # separator count should be (2 <= $sep_cnt <= 7)

    if ! (in_between $sep_cnt 2 7); then

        err 5 "Invalid IP6 address: $1"

    fi



    # if shrink '::' occurs multiple, it's malformed.

    shrink=( $(egrep -o "$sep{2,}" <<< $addr) )

    if [[ ${#shrink[@]} -ne 0 ]]; then

        if [[ ${#shrink[@]} -gt 1 || ( ${shrink[0]} != $sep2 ) ]]; then

            err 5 "Invalid IP6 address: $1"

        fi

    fi



    # add 0 at begin & end, and extend addr by adding :0

    [[ ${addr:0:1} == $sep ]] && addr=0${addr}

    [[ ${addr: -1} == $sep ]] && addr=${addr}0

    echo "${addr/$sep2/$(printf ':0%.s' $(seq $[8-sep_cnt])):}"

}



# Given a single IP(v4/v6) address, whether it is valid.

function validate_addr()

{

    # check function is called with (funcname)6

    [[ ${FUNCNAME[1]: -1} == 6 ]] && local IP6=6

    local bitlen=$[ IP6 ? 128 : 32 ]

    local len=$[ IP6 ? 8 : 4 ]

    local max=$[ 2**(len*2)-1 ]

    local net prefix

    local addr sep



    IFS='/' read net prefix <<< $1

    [[ $IP6 ]] && net=$(extend_addr6 $net)



    # if prefix exists, check (0 <= $prefix <= $bitlen)

    if [[ -n $prefix ]]; then

        if ! (in_between $prefix 0 $bitlen); then

            err 5 "Invalid prefix: /$prefix"

        fi

    fi



    # set separator for each IP(v4/v6)

    [[ $IP6 ]] && sep=: || sep=.

    IFS=$sep read -a addr <<< $net



    # array length

    if [[ ${#addr[@]} != $len ]]; then

        err 5 "Invalid IP$IP6 address: $1"

    fi



    # check each digit (0 <= $digit <= $max)

    for digit in "${addr[@]}"; do

        [[ $IP6 ]] && digit=$[ 16#$digit ]

        if ! (in_between $digit 0 $max); then

            err 5 "Invalid IP$IP6 address: $1"

        fi

    done



    return 0

}



function validate_addr6() { validate_addr $@ ; }



# Given a single IP(v4/v6) or CIDR, return minimum and maximum IP addr.

function parse_addr()

{

    # check function is called with (funcname)6

    [[ ${FUNCNAME[1]: -1} == 6 ]] && local IP6=6

    local net prefix

    local min_ip max_ip



    IFS='/' read net prefix <<< $1

    [[ $IP6 ]] && net=$(extend_addr6 $net)



    if [[ -z $prefix ]]; then

        min_ip=$net

        max_ip=$net

    else

        # defining array for converting Decimal 2 Binary

        # 00000000 00000001 00000010 00000011 00000100 ...

        local d2b='{0..1}{0..1}{0..1}{0..1}{0..1}{0..1}{0..1}{0..1}'

        [[ $IP6 ]] && d2b+=$d2b

        eval local D2B=($d2b)



        local bitlen=$[ IP6 ? 128 : 32 ]

        local remain=$[ bitlen-prefix ]

        local octet=$[ IP6 ? 16 : 8 ]

        local min_mask max_mask

        local min max

        local ip_bit

        local ip sep



        # set separator for each IP(v4/v6)

        [[ $IP6 ]] && sep=: || sep=.

        IFS=$sep read -ra ip <<< $net



        min_mask="$(printf '1%.s' $(seq $prefix))$(printf '0%.s' $(seq $remain))"

        max_mask="$(printf '0%.s' $(seq $prefix))$(printf '1%.s' $(seq $remain))"



        # calculate min/max ip with &,| operator

        for i in "${!ip[@]}"; do

            digit=$[ IP6 ? 16#${ip[$i]} : ${ip[$i]} ]

            ip_bit=${D2B[$digit]}



            idx=$[ octet*i ]

            min[$i]=$[ 2#$ip_bit & 2#${min_mask:$idx:$octet} ]

            max[$i]=$[ 2#$ip_bit | 2#${max_mask:$idx:$octet} ]

            [[ $IP6 ]] && { min[$i]=$(printf '%X' ${min[$i]});

                            max[$i]=$(printf '%X' ${max[$i]}); }

        done



        min_ip=$(IFS=$sep; echo "${min[*]}")

        max_ip=$(IFS=$sep; echo "${max[*]}")

    fi



    echo $min_ip $max_ip

}



function parse_addr6() { parse_addr $@ ; }



# Given a single or range of port(s), return minimum and maximum port number.

function parse_ports()

{
@@ -190,9 +321,9 @@ function validate_ports() 
    local min_port=$1

    local max_port=$2



    # 0 < port < 65536

    if [[ $min_port -gt 0 && $min_port -lt 65536 ]]; then

	if [[ $max_port -gt 0 && $max_port -lt 65536 ]]; then

    # 1 <= port <= 65535

    if (in_between $min_port 1 65535); then

	if (in_between $max_port 1 65535); then

	    if [[ $min_port -le $max_port ]]; then

		return 0

	    fi

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