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base-files: add functions to set or clear bit in MAC address

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Some devices (e.g. Arduino Yun) need bitwise operations during MAC address
setup. This commit adds generalized versions of macaddr_setbit_la(), which
are helpful when manipulating a single bit in a MAC address.

Signed-off-by: Sungbo Eo <mans0n@gorani.run>
This commit is contained in:
Sungbo Eo 2020-01-25 23:06:07 +09:00
parent b77fd0d30b
commit 7cfc880936
1 changed files with 18 additions and 2 deletions
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20
package/base-files/files/lib/functions/system.sh
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@ -152,10 +152,26 @@ macaddr_geteui() {
echo ${mac:9:2}$sep${mac:12:2}$sep${mac:15:2} echo ${mac:9:2}$sep${mac:12:2}$sep${mac:15:2}
} }
macaddr_setbit_la() { macaddr_setbit() {
local mac=$1 local mac=$1
local bit=${2:-0}
printf "%02x:%s" $((0x${mac%%:*} | 0x02)) ${mac#*:} [ $bit -gt 0 -a $bit -le 48 ] || return
printf "%012x" $(( 0x${mac//:/} | 2**(48-bit) )) | sed -e 's/\(.\{2\}\)/\1:/g' -e 's/:$//'
}
macaddr_unsetbit() {
local mac=$1
local bit=${2:-0}
[ $bit -gt 0 -a $bit -le 48 ] || return
printf "%012x" $(( 0x${mac//:/} & ~(2**(48-bit)) )) | sed -e 's/\(.\{2\}\)/\1:/g' -e 's/:$//'
}
macaddr_setbit_la() {
macaddr_setbit $1 7
} }
macaddr_2bin() { macaddr_2bin() {