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Linux/net/netfilter/xt_bpf.c

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  1 /* Xtables module to match packets using a BPF filter.
  2  * Copyright 2013 Google Inc.
  3  * Written by Willem de Bruijn <willemb@google.com>
  4  *
  5  * This program is free software; you can redistribute it and/or modify
  6  * it under the terms of the GNU General Public License version 2 as
  7  * published by the Free Software Foundation.
  8  */
  9 
 10 #include <linux/module.h>
 11 #include <linux/skbuff.h>
 12 #include <linux/filter.h>
 13 
 14 #include <linux/netfilter/xt_bpf.h>
 15 #include <linux/netfilter/x_tables.h>
 16 
 17 MODULE_AUTHOR("Willem de Bruijn <willemb@google.com>");
 18 MODULE_DESCRIPTION("Xtables: BPF filter match");
 19 MODULE_LICENSE("GPL");
 20 MODULE_ALIAS("ipt_bpf");
 21 MODULE_ALIAS("ip6t_bpf");
 22 
 23 static int bpf_mt_check(const struct xt_mtchk_param *par)
 24 {
 25         struct xt_bpf_info *info = par->matchinfo;
 26         struct sock_fprog_kern program;
 27 
 28         program.len = info->bpf_program_num_elem;
 29         program.filter = info->bpf_program;
 30 
 31         if (bpf_prog_create(&info->filter, &program)) {
 32                 pr_info("bpf: check failed: parse error\n");
 33                 return -EINVAL;
 34         }
 35 
 36         return 0;
 37 }
 38 
 39 static bool bpf_mt(const struct sk_buff *skb, struct xt_action_param *par)
 40 {
 41         const struct xt_bpf_info *info = par->matchinfo;
 42 
 43         return BPF_PROG_RUN(info->filter, skb);
 44 }
 45 
 46 static void bpf_mt_destroy(const struct xt_mtdtor_param *par)
 47 {
 48         const struct xt_bpf_info *info = par->matchinfo;
 49         bpf_prog_destroy(info->filter);
 50 }
 51 
 52 static struct xt_match bpf_mt_reg __read_mostly = {
 53         .name           = "bpf",
 54         .revision       = 0,
 55         .family         = NFPROTO_UNSPEC,
 56         .checkentry     = bpf_mt_check,
 57         .match          = bpf_mt,
 58         .destroy        = bpf_mt_destroy,
 59         .matchsize      = sizeof(struct xt_bpf_info),
 60         .me             = THIS_MODULE,
 61 };
 62 
 63 static int __init bpf_mt_init(void)
 64 {
 65         return xt_register_match(&bpf_mt_reg);
 66 }
 67 
 68 static void __exit bpf_mt_exit(void)
 69 {
 70         xt_unregister_match(&bpf_mt_reg);
 71 }
 72 
 73 module_init(bpf_mt_init);
 74 module_exit(bpf_mt_exit);
 75 

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