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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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1234567891011121314151617181920212223242526272829303132333435363738394041424344/* 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/bpf_helpers.h>#include "bpf_legacy.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";