* [PATCH v2] util: add function mtu_is_valid
@ 2017-06-07 6:24 Jonatan Schlag
0 siblings, 0 replies; only message in thread
From: Jonatan Schlag @ 2017-06-07 6:24 UTC (permalink / raw)
To: network
[-- Attachment #1: Type: text/plain, Size: 792 bytes --]
This function checks if an mtu is valid for a given IP protocol.
Signed-off-by: Jonatan Schlag <jonatan.schlag(a)ipfire.org>
---
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
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