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Linux/net/netfilter/xt_ipcomp.c

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  1 /*  Kernel module to match IPComp parameters for IPv4 and IPv6
  2  *
  3  *  Copyright (C) 2013 WindRiver
  4  *
  5  *  Author:
  6  *  Fan Du <fan.du@windriver.com>
  7  *
  8  *  Based on:
  9  *  net/netfilter/xt_esp.c
 10  *
 11  *  This program is free software; you can redistribute it and/or
 12  *  modify it under the terms of the GNU General Public License
 13  *  as published by the Free Software Foundation; either version
 14  *  2 of the License, or (at your option) any later version.
 15  */
 16 
 17 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 18 #include <linux/in.h>
 19 #include <linux/module.h>
 20 #include <linux/skbuff.h>
 21 #include <linux/ip.h>
 22 
 23 #include <linux/netfilter/xt_ipcomp.h>
 24 #include <linux/netfilter/x_tables.h>
 25 
 26 MODULE_LICENSE("GPL");
 27 MODULE_AUTHOR("Fan Du <fan.du@windriver.com>");
 28 MODULE_DESCRIPTION("Xtables: IPv4/6 IPsec-IPComp SPI match");
 29 MODULE_ALIAS("ipt_ipcomp");
 30 MODULE_ALIAS("ip6t_ipcomp");
 31 
 32 /* Returns 1 if the spi is matched by the range, 0 otherwise */
 33 static inline bool
 34 spi_match(u_int32_t min, u_int32_t max, u_int32_t spi, bool invert)
 35 {
 36         bool r;
 37         pr_debug("spi_match:%c 0x%x <= 0x%x <= 0x%x\n",
 38                  invert ? '!' : ' ', min, spi, max);
 39         r = (spi >= min && spi <= max) ^ invert;
 40         pr_debug(" result %s\n", r ? "PASS" : "FAILED");
 41         return r;
 42 }
 43 
 44 static bool comp_mt(const struct sk_buff *skb, struct xt_action_param *par)
 45 {
 46         struct ip_comp_hdr _comphdr;
 47         const struct ip_comp_hdr *chdr;
 48         const struct xt_ipcomp *compinfo = par->matchinfo;
 49 
 50         /* Must not be a fragment. */
 51         if (par->fragoff != 0)
 52                 return false;
 53 
 54         chdr = skb_header_pointer(skb, par->thoff, sizeof(_comphdr), &_comphdr);
 55         if (chdr == NULL) {
 56                 /* We've been asked to examine this packet, and we
 57                  * can't.  Hence, no choice but to drop.
 58                  */
 59                 pr_debug("Dropping evil IPComp tinygram.\n");
 60                 par->hotdrop = true;
 61                 return false;
 62         }
 63 
 64         return spi_match(compinfo->spis[0], compinfo->spis[1],
 65                          ntohs(chdr->cpi),
 66                          !!(compinfo->invflags & XT_IPCOMP_INV_SPI));
 67 }
 68 
 69 static int comp_mt_check(const struct xt_mtchk_param *par)
 70 {
 71         const struct xt_ipcomp *compinfo = par->matchinfo;
 72 
 73         /* Must specify no unknown invflags */
 74         if (compinfo->invflags & ~XT_IPCOMP_INV_MASK) {
 75                 pr_info_ratelimited("unknown flags %X\n", compinfo->invflags);
 76                 return -EINVAL;
 77         }
 78         return 0;
 79 }
 80 
 81 static struct xt_match comp_mt_reg[] __read_mostly = {
 82         {
 83                 .name           = "ipcomp",
 84                 .family         = NFPROTO_IPV4,
 85                 .match          = comp_mt,
 86                 .matchsize      = sizeof(struct xt_ipcomp),
 87                 .proto          = IPPROTO_COMP,
 88                 .checkentry     = comp_mt_check,
 89                 .me             = THIS_MODULE,
 90         },
 91         {
 92                 .name           = "ipcomp",
 93                 .family         = NFPROTO_IPV6,
 94                 .match          = comp_mt,
 95                 .matchsize      = sizeof(struct xt_ipcomp),
 96                 .proto          = IPPROTO_COMP,
 97                 .checkentry     = comp_mt_check,
 98                 .me             = THIS_MODULE,
 99         },
100 };
101 
102 static int __init comp_mt_init(void)
103 {
104         return xt_register_matches(comp_mt_reg, ARRAY_SIZE(comp_mt_reg));
105 }
106 
107 static void __exit comp_mt_exit(void)
108 {
109         xt_unregister_matches(comp_mt_reg, ARRAY_SIZE(comp_mt_reg));
110 }
111 
112 module_init(comp_mt_init);
113 module_exit(comp_mt_exit);
114 

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