| /* Copyright (c) 2017 Intel Deutschland GmbH |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of version 2 of the GNU General Public |
| * License as published by the Free Software Foundation. |
| */ |
| #define KBUILD_MODNAME "wifimon_test" |
| #include <uapi/linux/bpf.h> |
| #include <linux/ieee80211.h> |
| #include "bpf_helpers.h" |
| |
| SEC("wifimon_no_data") |
| int wifimon_no_data(struct __sk_buff *skb) |
| { |
| u8 fc1; |
| int ret = bpf_skb_load_bytes(skb, 0, &fc1, sizeof(fc1)); |
| |
| /* reject data frames */ |
| if ((fc1 & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) |
| return 0; |
| |
| /* reject beacon frames */ |
| if ((fc1 & (IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE)) == |
| (IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON)) |
| return 0; |
| |
| /* accept */ |
| return 1; |
| } |
| |
| char _license[] SEC("license") = "GPL"; |
