From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jonatan Schlag To: development@lists.ipfire.org Subject: [PATCH v2] util: add function mtu_is_valid Date: Wed, 07 Jun 2017 08:24:34 +0200 Message-ID: <1496816674-6333-1-git-send-email-jonatan.schlag@ipfire.org> MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="===============2054916610209194506==" List-Id: --===============2054916610209194506== Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit This function checks if an mtu is valid for a given IP protocol. Signed-off-by: Jonatan Schlag --- src/functions/functions.util | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/src/functions/functions.util b/src/functions/functions.util index 4b6f956..b7e35c9 100644 --- a/src/functions/functions.util +++ b/src/functions/functions.util @@ -321,6 +321,24 @@ isipaddress() { ip_is_valid ${addr} } +mtu_is_valid() { + local proto=${1} + local mtu=${2} + + case ${proto} in + ipv4) + [ ${mtu} -ge 576 ] && [ ${mtu} -le 9000 ] + ;; + ipv6) + [ ${mtu} -ge 1280 ] && [ ${mtu} -le 9000 ] + ;; + *) + error "${proto} is not a valid proto" + return ${EXIT_ERROR} + ;; + esac +} + backtrace() { local start=1 -- 2.6.3 --===============2054916610209194506==--