Eric Lee / smarc-fsl-linux-kernel

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samples/bpf/test_cgrp2_tc_kern.c 1.81 KB
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a3f746173   Martin KaFai Lau   cgroup: bpf: Add ... 
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  /* 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.
   */
96a8eb1ee   Daniel Borkmann   bpf: fix samples ... 
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  #define KBUILD_MODNAME "foo"
a3f746173   Martin KaFai Lau   cgroup: bpf: Add ... 
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  #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 = {
  	.type		= BPF_MAP_TYPE_CGROUP_ARRAY,
  	.size_key	= sizeof(uint32_t),
  	.size_value	= sizeof(uint32_t),
  	.pinning	= PIN_GLOBAL_NS,
  	.max_elem	= 1,
  };
  
  SEC("filter")
  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
  ";
  	char pass_msg[] = "pass
  ";
  	char reject_msg[] = "reject
  ";
  
  	/* 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;
747ea55e4   Daniel Borkmann   bpf: fix bpf_skb_... 
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  	} else if (bpf_skb_under_cgroup(skb, &test_cgrp2_array_pin, 0) != 1) {
a3f746173   Martin KaFai Lau   cgroup: bpf: Add ... 
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  		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;
  	}
  }
  
  char _license[] SEC("license") = "GPL";