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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 program;
 27 
 28         program.len = info->bpf_program_num_elem;
 29         program.filter = (struct sock_filter __user *) info->bpf_program;
 30         if (sk_unattached_filter_create(&info->filter, &program)) {
 31                 pr_info("bpf: check failed: parse error\n");
 32                 return -EINVAL;
 33         }
 34 
 35         return 0;
 36 }
 37 
 38 static bool bpf_mt(const struct sk_buff *skb, struct xt_action_param *par)
 39 {
 40         const struct xt_bpf_info *info = par->matchinfo;
 41 
 42         return SK_RUN_FILTER(info->filter, skb);
 43 }
 44 
 45 static void bpf_mt_destroy(const struct xt_mtdtor_param *par)
 46 {
 47         const struct xt_bpf_info *info = par->matchinfo;
 48         sk_unattached_filter_destroy(info->filter);
 49 }
 50 
 51 static struct xt_match bpf_mt_reg __read_mostly = {
 52         .name           = "bpf",
 53         .revision       = 0,
 54         .family         = NFPROTO_UNSPEC,
 55         .checkentry     = bpf_mt_check,
 56         .match          = bpf_mt,
 57         .destroy        = bpf_mt_destroy,
 58         .matchsize      = sizeof(struct xt_bpf_info),
 59         .me             = THIS_MODULE,
 60 };
 61 
 62 static int __init bpf_mt_init(void)
 63 {
 64         return xt_register_match(&bpf_mt_reg);
 65 }
 66 
 67 static void __exit bpf_mt_exit(void)
 68 {
 69         xt_unregister_match(&bpf_mt_reg);
 70 }
 71 
 72 module_init(bpf_mt_init);
 73 module_exit(bpf_mt_exit);
 74 

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