cregit-Linux how code gets into the kernel

Release 4.10 samples/bpf/test_cgrp2_tc_kern.c

Directory: samples/bpf
/* 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 <uapi/linux/if_ether.h>
#include <uapi/linux/in6.h>
#include <uapi/linux/ipv6.h>
#include <uapi/linux/pkt_cls.h>
#include <uapi/linux/bpf.h>
#include "bpf_helpers.h"

/* 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;

#define PIN_GLOBAL_NS		2

struct bpf_elf_map {
__u32 type;
__u32 size_key;
__u32 size_value;
__u32 max_elem;
__u32 flags;
__u32 id;
__u32 pinning;

struct bpf_elf_map SEC("maps") test_cgrp2_array_pin = {
	.size_key	= sizeof(uint32_t),
	.size_value	= sizeof(uint32_t),
	.pinning	= PIN_GLOBAL_NS,
	.max_elem	= 1,


int handle_egress(struct __sk_buff *skb) { void *data = (void *)(long)skb->data; struct eth_hdr *eth = data; struct ipv6hdr *ip6h = data + sizeof(*eth); void *data_end = (void *)(long)skb->data_end; char dont_care_msg[] = "dont care %04x %d\n"; char pass_msg[] = "pass\n"; char reject_msg[] = "reject\n"; /* single length check */ if (data + sizeof(*eth) + sizeof(*ip6h) > data_end) return TC_ACT_OK; if (eth->h_proto != htons(ETH_P_IPV6) || ip6h->nexthdr != IPPROTO_ICMPV6) { bpf_trace_printk(dont_care_msg, sizeof(dont_care_msg), eth->h_proto, ip6h->nexthdr); return TC_ACT_OK; } else if (bpf_skb_under_cgroup(skb, &test_cgrp2_array_pin, 0) != 1) { bpf_trace_printk(pass_msg, sizeof(pass_msg)); return TC_ACT_OK; } else { bpf_trace_printk(reject_msg, sizeof(reject_msg)); return TC_ACT_SHOT; } }


martin kafai laumartin kafai lau18599.46%150.00%
daniel borkmanndaniel borkmann10.54%150.00%

char _license[] SEC("license") = "GPL";

Overall Contributors

martin kafai laumartin kafai lau31398.43%133.33%
daniel borkmanndaniel borkmann51.57%266.67%
Directory: samples/bpf
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