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Linux/net/netfilter/xt_length.c

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  1 // SPDX-License-Identifier: GPL-2.0-only
  2 /* Kernel module to match packet length. */
  3 /* (C) 1999-2001 James Morris <jmorros@intercode.com.au>
  4  */
  5 
  6 #include <linux/module.h>
  7 #include <linux/skbuff.h>
  8 #include <linux/ipv6.h>
  9 #include <net/ip.h>
 10 
 11 #include <linux/netfilter/xt_length.h>
 12 #include <linux/netfilter/x_tables.h>
 13 
 14 MODULE_AUTHOR("James Morris <jmorris@intercode.com.au>");
 15 MODULE_DESCRIPTION("Xtables: Packet length (Layer3,4,5) match");
 16 MODULE_LICENSE("GPL");
 17 MODULE_ALIAS("ipt_length");
 18 MODULE_ALIAS("ip6t_length");
 19 
 20 static bool
 21 length_mt(const struct sk_buff *skb, struct xt_action_param *par)
 22 {
 23         const struct xt_length_info *info = par->matchinfo;
 24         u_int16_t pktlen = ntohs(ip_hdr(skb)->tot_len);
 25 
 26         return (pktlen >= info->min && pktlen <= info->max) ^ info->invert;
 27 }
 28 
 29 static bool
 30 length_mt6(const struct sk_buff *skb, struct xt_action_param *par)
 31 {
 32         const struct xt_length_info *info = par->matchinfo;
 33         const u_int16_t pktlen = ntohs(ipv6_hdr(skb)->payload_len) +
 34                                  sizeof(struct ipv6hdr);
 35 
 36         return (pktlen >= info->min && pktlen <= info->max) ^ info->invert;
 37 }
 38 
 39 static struct xt_match length_mt_reg[] __read_mostly = {
 40         {
 41                 .name           = "length",
 42                 .family         = NFPROTO_IPV4,
 43                 .match          = length_mt,
 44                 .matchsize      = sizeof(struct xt_length_info),
 45                 .me             = THIS_MODULE,
 46         },
 47         {
 48                 .name           = "length",
 49                 .family         = NFPROTO_IPV6,
 50                 .match          = length_mt6,
 51                 .matchsize      = sizeof(struct xt_length_info),
 52                 .me             = THIS_MODULE,
 53         },
 54 };
 55 
 56 static int __init length_mt_init(void)
 57 {
 58         return xt_register_matches(length_mt_reg, ARRAY_SIZE(length_mt_reg));
 59 }
 60 
 61 static void __exit length_mt_exit(void)
 62 {
 63         xt_unregister_matches(length_mt_reg, ARRAY_SIZE(length_mt_reg));
 64 }
 65 
 66 module_init(length_mt_init);
 67 module_exit(length_mt_exit);
 68 

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