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: Daniel T. Lee <danieltimlee@gmail.com> Acked-by: Jesper Dangaard Brouer <brouer@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Daniel T. Lee
David S. Miller
parent
3cad8f9115
commit
f0681d95e7
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@ -168,6 +168,137 @@ function get_node_cpus()
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echo $node_cpu_list
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}
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# Check $1 is in between $2, $3 ($2 <= $1 <= $3)
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function in_between() { [[ ($1 -ge $2) && ($1 -le $3) ]] ; }
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# Extend shrunken IPv6 address.
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# fe80::42:bcff:fe84:e10a => fe80:0:0:0:42:bcff:fe84:e10a
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function extend_addr6()
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{
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local addr=$1
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local sep=: sep2=::
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local sep_cnt=$(tr -cd $sep <<< $1 | wc -c)
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local shrink
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# separator count should be (2 <= $sep_cnt <= 7)
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if ! (in_between $sep_cnt 2 7); then
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err 5 "Invalid IP6 address: $1"
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fi
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# if shrink '::' occurs multiple, it's malformed.
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shrink=( $(egrep -o "$sep{2,}" <<< $addr) )
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if [[ ${#shrink[@]} -ne 0 ]]; then
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if [[ ${#shrink[@]} -gt 1 || ( ${shrink[0]} != $sep2 ) ]]; then
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err 5 "Invalid IP6 address: $1"
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fi
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fi
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# add 0 at begin & end, and extend addr by adding :0
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[[ ${addr:0:1} == $sep ]] && addr=0${addr}
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[[ ${addr: -1} == $sep ]] && addr=${addr}0
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echo "${addr/$sep2/$(printf ':0%.s' $(seq $[8-sep_cnt])):}"
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}
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# Given a single IP(v4/v6) address, whether it is valid.
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function validate_addr()
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{
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# check function is called with (funcname)6
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[[ ${FUNCNAME[1]: -1} == 6 ]] && local IP6=6
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local bitlen=$[ IP6 ? 128 : 32 ]
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local len=$[ IP6 ? 8 : 4 ]
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local max=$[ 2**(len*2)-1 ]
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local net prefix
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local addr sep
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IFS='/' read net prefix <<< $1
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[[ $IP6 ]] && net=$(extend_addr6 $net)
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# if prefix exists, check (0 <= $prefix <= $bitlen)
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if [[ -n $prefix ]]; then
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if ! (in_between $prefix 0 $bitlen); then
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err 5 "Invalid prefix: /$prefix"
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fi
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fi
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# set separator for each IP(v4/v6)
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[[ $IP6 ]] && sep=: || sep=.
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IFS=$sep read -a addr <<< $net
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# array length
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if [[ ${#addr[@]} != $len ]]; then
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err 5 "Invalid IP$IP6 address: $1"
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fi
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# check each digit (0 <= $digit <= $max)
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for digit in "${addr[@]}"; do
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[[ $IP6 ]] && digit=$[ 16#$digit ]
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if ! (in_between $digit 0 $max); then
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err 5 "Invalid IP$IP6 address: $1"
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fi
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done
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return 0
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}
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function validate_addr6() { validate_addr $@ ; }
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# Given a single IP(v4/v6) or CIDR, return minimum and maximum IP addr.
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function parse_addr()
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{
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# check function is called with (funcname)6
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[[ ${FUNCNAME[1]: -1} == 6 ]] && local IP6=6
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local net prefix
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local min_ip max_ip
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IFS='/' read net prefix <<< $1
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[[ $IP6 ]] && net=$(extend_addr6 $net)
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if [[ -z $prefix ]]; then
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min_ip=$net
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max_ip=$net
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else
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# defining array for converting Decimal 2 Binary
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# 00000000 00000001 00000010 00000011 00000100 ...
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local d2b='{0..1}{0..1}{0..1}{0..1}{0..1}{0..1}{0..1}{0..1}'
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[[ $IP6 ]] && d2b+=$d2b
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eval local D2B=($d2b)
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local bitlen=$[ IP6 ? 128 : 32 ]
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local remain=$[ bitlen-prefix ]
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local octet=$[ IP6 ? 16 : 8 ]
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local min_mask max_mask
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local min max
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local ip_bit
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local ip sep
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# set separator for each IP(v4/v6)
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[[ $IP6 ]] && sep=: || sep=.
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IFS=$sep read -ra ip <<< $net
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min_mask="$(printf '1%.s' $(seq $prefix))$(printf '0%.s' $(seq $remain))"
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max_mask="$(printf '0%.s' $(seq $prefix))$(printf '1%.s' $(seq $remain))"
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# calculate min/max ip with &,| operator
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for i in "${!ip[@]}"; do
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digit=$[ IP6 ? 16#${ip[$i]} : ${ip[$i]} ]
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ip_bit=${D2B[$digit]}
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idx=$[ octet*i ]
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min[$i]=$[ 2#$ip_bit & 2#${min_mask:$idx:$octet} ]
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max[$i]=$[ 2#$ip_bit | 2#${max_mask:$idx:$octet} ]
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[[ $IP6 ]] && { min[$i]=$(printf '%X' ${min[$i]});
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max[$i]=$(printf '%X' ${max[$i]}); }
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done
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min_ip=$(IFS=$sep; echo "${min[*]}")
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max_ip=$(IFS=$sep; echo "${max[*]}")
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fi
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echo $min_ip $max_ip
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}
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function parse_addr6() { parse_addr $@ ; }
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# Given a single or range of port(s), return minimum and maximum port number.
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function parse_ports()
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{
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@ -190,9 +321,9 @@ function validate_ports()
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local min_port=$1
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local max_port=$2
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# 0 < port < 65536
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if [[ $min_port -gt 0 && $min_port -lt 65536 ]]; then
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if [[ $max_port -gt 0 && $max_port -lt 65536 ]]; then
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# 1 <= port <= 65535
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if (in_between $min_port 1 65535); then
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if (in_between $max_port 1 65535); then
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if [[ $min_port -le $max_port ]]; then
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return 0
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fi
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