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| author | Sungbo Eo <mans0n@gorani.run> | 2020-01-25 23:06:07 +0900 |
|---|---|---|
| committer | Petr Štetiar <ynezz@true.cz> | 2020-07-08 23:22:30 +0200 |
| commit | dc61e3b7ffdc2e3873af238a9100d44ee685578c (patch) | |
| tree | 6934345a5301be10b013361bf967eb7fd7a2f7fb /package/base-files | |
| parent | af9932c9b7b94417d46ba59439793514e93ba8a6 (diff) | |
| download | upstream-dc61e3b7ffdc2e3873af238a9100d44ee685578c.tar.gz upstream-dc61e3b7ffdc2e3873af238a9100d44ee685578c.tar.bz2 upstream-dc61e3b7ffdc2e3873af238a9100d44ee685578c.zip | |
base-files: add functions to set or clear bit in MAC address
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>
Diffstat (limited to 'package/base-files')
| -rw-r--r-- | package/base-files/files/lib/functions/system.sh | 20 |
1 files changed, 18 insertions, 2 deletions
diff --git a/package/base-files/files/lib/functions/system.sh b/package/base-files/files/lib/functions/system.sh index c7aa7bf75c..f3c901ff79 100644 --- a/package/base-files/files/lib/functions/system.sh +++ b/package/base-files/files/lib/functions/system.sh @@ -152,10 +152,26 @@ macaddr_geteui() { echo ${mac:9:2}$sep${mac:12:2}$sep${mac:15:2} } -macaddr_setbit_la() { +macaddr_setbit() { + 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_unsetbit() { local mac=$1 + local bit=${2:-0} + + [ $bit -gt 0 -a $bit -le 48 ] || return - printf "%02x:%s" $((0x${mac%%:*} | 0x02)) ${mac#*:} + printf "%012x" $(( 0x${mac//:/} & ~(2**(48-bit)) )) | sed -e 's/\(.\{2\}\)/\1:/g' -e 's/:$//' +} + +macaddr_setbit_la() { + macaddr_setbit $1 7 } macaddr_2bin() { |