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Linux/net/netfilter/xt_ipcomp.c

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  1 // SPDX-License-Identifier: GPL-2.0-or-later
  2 /*  Kernel module to match IPComp parameters for IPv4 and IPv6
  3  *
  4  *  Copyright (C) 2013 WindRiver
  5  *
  6  *  Author:
  7  *  Fan Du <fan.du@windriver.com>
  8  *
  9  *  Based on:
 10  *  net/netfilter/xt_esp.c
 11  */
 12 
 13 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 14 #include <linux/in.h>
 15 #include <linux/module.h>
 16 #include <linux/skbuff.h>
 17 #include <linux/ip.h>
 18 
 19 #include <linux/netfilter/xt_ipcomp.h>
 20 #include <linux/netfilter/x_tables.h>
 21 
 22 MODULE_LICENSE("GPL");
 23 MODULE_AUTHOR("Fan Du <fan.du@windriver.com>");
 24 MODULE_DESCRIPTION("Xtables: IPv4/6 IPsec-IPComp SPI match");
 25 MODULE_ALIAS("ipt_ipcomp");
 26 MODULE_ALIAS("ip6t_ipcomp");
 27 
 28 /* Returns 1 if the spi is matched by the range, 0 otherwise */
 29 static inline bool
 30 spi_match(u_int32_t min, u_int32_t max, u_int32_t spi, bool invert)
 31 {
 32         bool r;
 33         pr_debug("spi_match:%c 0x%x <= 0x%x <= 0x%x\n",
 34                  invert ? '!' : ' ', min, spi, max);
 35         r = (spi >= min && spi <= max) ^ invert;
 36         pr_debug(" result %s\n", r ? "PASS" : "FAILED");
 37         return r;
 38 }
 39 
 40 static bool comp_mt(const struct sk_buff *skb, struct xt_action_param *par)
 41 {
 42         struct ip_comp_hdr _comphdr;
 43         const struct ip_comp_hdr *chdr;
 44         const struct xt_ipcomp *compinfo = par->matchinfo;
 45 
 46         /* Must not be a fragment. */
 47         if (par->fragoff != 0)
 48                 return false;
 49 
 50         chdr = skb_header_pointer(skb, par->thoff, sizeof(_comphdr), &_comphdr);
 51         if (chdr == NULL) {
 52                 /* We've been asked to examine this packet, and we
 53                  * can't.  Hence, no choice but to drop.
 54                  */
 55                 pr_debug("Dropping evil IPComp tinygram.\n");
 56                 par->hotdrop = true;
 57                 return false;
 58         }
 59 
 60         return spi_match(compinfo->spis[0], compinfo->spis[1],
 61                          ntohs(chdr->cpi),
 62                          !!(compinfo->invflags & XT_IPCOMP_INV_SPI));
 63 }
 64 
 65 static int comp_mt_check(const struct xt_mtchk_param *par)
 66 {
 67         const struct xt_ipcomp *compinfo = par->matchinfo;
 68 
 69         /* Must specify no unknown invflags */
 70         if (compinfo->invflags & ~XT_IPCOMP_INV_MASK) {
 71                 pr_info_ratelimited("unknown flags %X\n", compinfo->invflags);
 72                 return -EINVAL;
 73         }
 74         return 0;
 75 }
 76 
 77 static struct xt_match comp_mt_reg[] __read_mostly = {
 78         {
 79                 .name           = "ipcomp",
 80                 .family         = NFPROTO_IPV4,
 81                 .match          = comp_mt,
 82                 .matchsize      = sizeof(struct xt_ipcomp),
 83                 .proto          = IPPROTO_COMP,
 84                 .checkentry     = comp_mt_check,
 85                 .me             = THIS_MODULE,
 86         },
 87         {
 88                 .name           = "ipcomp",
 89                 .family         = NFPROTO_IPV6,
 90                 .match          = comp_mt,
 91                 .matchsize      = sizeof(struct xt_ipcomp),
 92                 .proto          = IPPROTO_COMP,
 93                 .checkentry     = comp_mt_check,
 94                 .me             = THIS_MODULE,
 95         },
 96 };
 97 
 98 static int __init comp_mt_init(void)
 99 {
100         return xt_register_matches(comp_mt_reg, ARRAY_SIZE(comp_mt_reg));
101 }
102 
103 static void __exit comp_mt_exit(void)
104 {
105         xt_unregister_matches(comp_mt_reg, ARRAY_SIZE(comp_mt_reg));
106 }
107 
108 module_init(comp_mt_init);
109 module_exit(comp_mt_exit);
110 

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