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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950/* 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 <net/ip.h>#include <bpf/bpf_helpers.h>
#define DEFAULT_PKTGEN_UDP_PORT 9
/* copy of 'struct ethhdr' without __packed */struct eth_hdr { unsigned char h_dest[ETH_ALEN]; unsigned char h_source[ETH_ALEN]; unsigned short h_proto;};
SEC("simple")int handle_ingress(struct __sk_buff *skb){ void *data = (void *)(long)skb->data; struct eth_hdr *eth = data; struct iphdr *iph = data + sizeof(*eth); struct udphdr *udp = data + sizeof(*eth) + sizeof(*iph); void *data_end = (void *)(long)skb->data_end;
/* single length check */ if (data + sizeof(*eth) + sizeof(*iph) + sizeof(*udp) > data_end) return 0;
if (eth->h_proto != htons(ETH_P_IP)) return 0; if (iph->protocol != IPPROTO_UDP || iph->ihl != 5) return 0; if (ip_is_fragment(iph)) return 0; if (udp->dest == htons(DEFAULT_PKTGEN_UDP_PORT)) return TC_ACT_SHOT; return 0;}char _license[] SEC("license") = "GPL";