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Release 4.11 net/netfilter/xt_ipcomp.c

Directory: net/netfilter
/*  Kernel module to match IPComp parameters for IPv4 and IPv6
 *
 *  Copyright (C) 2013 WindRiver
 *
 *  Author:
 *  Fan Du <fan.du@windriver.com>
 *
 *  Based on:
 *  net/netfilter/xt_esp.c
 *
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU General Public License
 *  as published by the Free Software Foundation; either version
 *  2 of the License, or (at your option) any later version.
 */


#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/in.h>
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/ip.h>

#include <linux/netfilter/xt_ipcomp.h>
#include <linux/netfilter/x_tables.h>

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Fan Du <fan.du@windriver.com>");
MODULE_DESCRIPTION("Xtables: IPv4/6 IPsec-IPComp SPI match");
MODULE_ALIAS("ipt_ipcomp");
MODULE_ALIAS("ip6t_ipcomp");

/* Returns 1 if the spi is matched by the range, 0 otherwise */

static inline bool spi_match(u_int32_t min, u_int32_t max, u_int32_t spi, bool invert) { bool r; pr_debug("spi_match:%c 0x%x <= 0x%x <= 0x%x\n", invert ? '!' : ' ', min, spi, max); r = (spi >= min && spi <= max) ^ invert; pr_debug(" result %s\n", r ? "PASS" : "FAILED"); return r; }

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static bool comp_mt(const struct sk_buff *skb, struct xt_action_param *par) { struct ip_comp_hdr _comphdr; const struct ip_comp_hdr *chdr; const struct xt_ipcomp *compinfo = par->matchinfo; /* Must not be a fragment. */ if (par->fragoff != 0) return false; chdr = skb_header_pointer(skb, par->thoff, sizeof(_comphdr), &_comphdr); if (chdr == NULL) { /* We've been asked to examine this packet, and we * can't. Hence, no choice but to drop. */ pr_debug("Dropping evil IPComp tinygram.\n"); par->hotdrop = true; return 0; } return spi_match(compinfo->spis[0], compinfo->spis[1], ntohs(chdr->cpi), !!(compinfo->invflags & XT_IPCOMP_INV_SPI)); }

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static int comp_mt_check(const struct xt_mtchk_param *par) { const struct xt_ipcomp *compinfo = par->matchinfo; /* Must specify no unknown invflags */ if (compinfo->invflags & ~XT_IPCOMP_INV_MASK) { pr_err("unknown flags %X\n", compinfo->invflags); return -EINVAL; } return 0; }

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static struct xt_match comp_mt_reg[] __read_mostly = { { .name = "ipcomp", .family = NFPROTO_IPV4, .match = comp_mt, .matchsize = sizeof(struct xt_ipcomp), .proto = IPPROTO_COMP, .checkentry = comp_mt_check, .me = THIS_MODULE, }, { .name = "ipcomp", .family = NFPROTO_IPV6, .match = comp_mt, .matchsize = sizeof(struct xt_ipcomp), .proto = IPPROTO_COMP, .checkentry = comp_mt_check, .me = THIS_MODULE, }, };
static int __init comp_mt_init(void) { return xt_register_matches(comp_mt_reg, ARRAY_SIZE(comp_mt_reg)); }

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static void __exit comp_mt_exit(void) { xt_unregister_matches(comp_mt_reg, ARRAY_SIZE(comp_mt_reg)); }

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module_init(comp_mt_init); module_exit(comp_mt_exit);

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Total435100.00%3100.00%
Directory: net/netfilter
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