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umbim: handle MTU configuration

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Allow setting interface MTU through UCI. If this is not set,
use MBIM-provided MTU, if provided through control channel.
If separate MTUs are provided for IPv4 and IPv6, apply larger of them.
This is very unlikely and possible only for IPv4v6 dual-stack configuration.

Signed-off-by: Lech Perczak <lech.perczak@gmail.com>
This commit is contained in:
Lech Perczak 2021-11-06 16:01:02 +01:00 committed by Hauke Mehrtens
parent 2bfbc2dbd8
commit e4db21b413
1 changed files with 16 additions and 2 deletions
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18
package/network/utils/umbim/files/lib/netifd/proto/mbim.sh
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@ -23,6 +23,7 @@ proto_mbim_init_config() {
proto_config_add_boolean dhcp
proto_config_add_boolean dhcpv6
proto_config_add_string pdptype
proto_config_add_int mtu
proto_config_add_defaults
}
@ -44,9 +45,9 @@ _proto_mbim_setup() {
local ret
local device apn pincode delay auth username password allow_roaming allow_partner
local dhcp dhcpv6 pdptype ip4table ip6table $PROTO_DEFAULT_OPTIONS
local dhcp dhcpv6 pdptype ip4table ip6table mtu $PROTO_DEFAULT_OPTIONS
json_get_vars device apn pincode delay auth username password allow_roaming allow_partner
json_get_vars dhcp dhcpv6 pdptype ip4table ip6table $PROTO_DEFAULT_OPTIONS
json_get_vars dhcp dhcpv6 pdptype ip4table ip6table mtu $PROTO_DEFAULT_OPTIONS
[ ! -e /proc/sys/net/ipv6 ] && ipv6=0 || json_get_var ipv6 ipv6
@ -294,6 +295,19 @@ _proto_mbim_setup() {
fi
}
[ -z "$mtu" ] && {
local ipv4mtu=$(_proto_mbim_get_field ipv4mtu "$mbimconfig")
ipv4mtu="${ipv4mtu:-0}"
local ipv6mtu=$(_proto_mbim_get_field ipv6mtu "$mbimconfig")
ipv6mtu="${ipv6mtu:-0}"
mtu=$((ipv6mtu > ipv4mtu ? ipv6mtu : ipv4mtu))
}
[ -n "$mtu" -a "$mtu" != 0 ] && {
echo Setting MTU of $ifname to $mtu
/sbin/ip link set dev $ifname mtu $mtu
}
uci_set_state network $interface tid "$tid"
}