threeeye
bc1d038eac
Squashed backup commit (no shallow-clone history issues) of xiaomi-mt6833-dev/kernel_xiaomi_mt6833 (lineage-23.2 branch, upstream commit 9eece662e) plus all fixes applied to get everpal_defconfig building clean against a modern (GCC 15.2.0) toolchain -- see the previous commit message on the lineage-23.2 branch (also in this repo history is not available here since this is a squashed snapshot; full incremental history lives in the local DL380 checkout and the upstream GitHub remote). Upstream: https://github.com/xiaomi-mt6833-dev/kernel_xiaomi_mt6833 (lineage-23.2)
43 lines
1.2 KiB
C
43 lines
1.2 KiB
C
/* Copyright (c) 2016 Facebook
|
|
*
|
|
* 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 "foo"
|
|
#include <linux/ip.h>
|
|
#include <linux/ipv6.h>
|
|
#include <linux/in.h>
|
|
#include <linux/tcp.h>
|
|
#include <linux/udp.h>
|
|
#include <uapi/linux/bpf.h>
|
|
#include "bpf_helpers.h"
|
|
|
|
#define DEFAULT_PKTGEN_UDP_PORT 9
|
|
#define IP_MF 0x2000
|
|
#define IP_OFFSET 0x1FFF
|
|
|
|
static inline int ip_is_fragment(struct __sk_buff *ctx, __u64 nhoff)
|
|
{
|
|
return load_half(ctx, nhoff + offsetof(struct iphdr, frag_off))
|
|
& (IP_MF | IP_OFFSET);
|
|
}
|
|
|
|
SEC("ldabs")
|
|
int handle_ingress(struct __sk_buff *skb)
|
|
{
|
|
__u64 troff = ETH_HLEN + sizeof(struct iphdr);
|
|
|
|
if (load_half(skb, offsetof(struct ethhdr, h_proto)) != ETH_P_IP)
|
|
return 0;
|
|
if (load_byte(skb, ETH_HLEN + offsetof(struct iphdr, protocol)) != IPPROTO_UDP ||
|
|
load_byte(skb, ETH_HLEN) != 0x45)
|
|
return 0;
|
|
if (ip_is_fragment(skb, ETH_HLEN))
|
|
return 0;
|
|
if (load_half(skb, troff + offsetof(struct udphdr, dest)) == DEFAULT_PKTGEN_UDP_PORT)
|
|
return TC_ACT_SHOT;
|
|
return 0;
|
|
}
|
|
char _license[] SEC("license") = "GPL";
|