Release 4.11 net/ipv6/netfilter/ip6t_ah.c

/* Kernel module to match AH parameters. */

/* (C) 2001-2002 Andras Kis-Szabo <kisza@sch.bme.hu>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <linux/types.h>
#include <net/checksum.h>
#include <net/ipv6.h>

#include <linux/netfilter/x_tables.h>
#include <linux/netfilter_ipv6/ip6_tables.h>
#include <linux/netfilter_ipv6/ip6t_ah.h>

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Xtables: IPv6 IPsec-AH match");
MODULE_AUTHOR("Andras Kis-Szabo <kisza@sch.bme.hu>");

/* 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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Harald Welte
59
88.06%
1
25.00%
Jan Engelhardt
4
5.97%
2
50.00%
Patrick McHardy
4
5.97%
1
25.00%
Total
67
100.00%
4
100.00%



static bool ah_mt6(const struct sk_buff *skb, struct xt_action_param *par)
{
	struct ip_auth_hdr _ah;
	const struct ip_auth_hdr *ah;
	const struct ip6t_ah *ahinfo = par->matchinfo;
	unsigned int ptr = 0;
	unsigned int hdrlen = 0;
	int err;

	err = ipv6_find_hdr(skb, &ptr, NEXTHDR_AUTH, NULL, NULL);
	if (err < 0) {
		if (err != -ENOENT)
			par->hotdrop = true;
		return false;
	}

	ah = skb_header_pointer(skb, ptr, sizeof(_ah), &_ah);
	if (ah == NULL) {
		par->hotdrop = true;
		return false;
	}

	hdrlen = (ah->hdrlen + 2) << 2;

	pr_debug("IPv6 AH LEN %u %u ", hdrlen, ah->hdrlen);
	pr_debug("RES %04X ", ah->reserved);
	pr_debug("SPI %u %08X\n", ntohl(ah->spi), ntohl(ah->spi));

	pr_debug("IPv6 AH spi %02X ",
		 spi_match(ahinfo->spis[0], ahinfo->spis[1],
			   ntohl(ah->spi),
			   !!(ahinfo->invflags & IP6T_AH_INV_SPI)));
	pr_debug("len %02X %04X %02X ",
		 ahinfo->hdrlen, hdrlen,
		 (!ahinfo->hdrlen ||
		  (ahinfo->hdrlen == hdrlen) ^
		  !!(ahinfo->invflags & IP6T_AH_INV_LEN)));
	pr_debug("res %02X %04X %02X\n",
		 ahinfo->hdrres, ah->reserved,
		 !(ahinfo->hdrres && ah->reserved));

	return (ah != NULL) &&
		spi_match(ahinfo->spis[0], ahinfo->spis[1],
			  ntohl(ah->spi),
			  !!(ahinfo->invflags & IP6T_AH_INV_SPI)) &&
		(!ahinfo->hdrlen ||
		 (ahinfo->hdrlen == hdrlen) ^
		 !!(ahinfo->invflags & IP6T_AH_INV_LEN)) &&
		!(ahinfo->hdrres && ah->reserved);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Harald Welte
270
76.49%
1
7.14%
Yasuyuki Kozakai
30
8.50%
2
14.29%
Patrick McHardy
29
8.22%
3
21.43%
Jan Engelhardt
19
5.38%
6
42.86%
Hans Schillstrom
4
1.13%
1
7.14%
David S. Miller
1
0.28%
1
7.14%
Total
353
100.00%
14
100.00%



static int ah_mt6_check(const struct xt_mtchk_param *par)
{
	const struct ip6t_ah *ahinfo = par->matchinfo;

	if (ahinfo->invflags & ~IP6T_AH_INV_MASK) {
		pr_debug("unknown flags %X\n", ahinfo->invflags);
		return -EINVAL;
	}
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Harald Welte
36
73.47%
1
12.50%
Jan Engelhardt
10
20.41%
5
62.50%
Patrick McHardy
3
6.12%
2
25.00%
Total
49
100.00%
8
100.00%


static struct xt_match ah_mt6_reg __read_mostly = {
	.name		= "ah",
	.family		= NFPROTO_IPV6,
	.match		= ah_mt6,
	.matchsize	= sizeof(struct ip6t_ah),
	.checkentry	= ah_mt6_check,
	.me		= THIS_MODULE,
};



static int __init ah_mt6_init(void)
{
	return xt_register_match(&ah_mt6_reg);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Harald Welte
13
81.25%
1
33.33%
Jan Engelhardt
3
18.75%
2
66.67%
Total
16
100.00%
3
100.00%



static void __exit ah_mt6_exit(void)
{
	xt_unregister_match(&ah_mt6_reg);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Harald Welte
12
80.00%
1
33.33%
Jan Engelhardt
3
20.00%
2
66.67%
Total
15
100.00%
3
100.00%


module_init(ah_mt6_init);

module_exit(ah_mt6_exit);
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Harald Welte
449
73.97%
2
7.41%
Jan Engelhardt
61
10.05%
13
48.15%
Patrick McHardy
46
7.58%
6
22.22%
Yasuyuki Kozakai
30
4.94%
2
7.41%
Art Haas
13
2.14%
1
3.70%
Hans Schillstrom
4
0.66%
1
3.70%
Arnaldo Carvalho de Melo
3
0.49%
1
3.70%
David S. Miller
1
0.16%
1
3.70%
Total
607
100.00%
27
100.00%
Directory: net/ipv6/netfilter

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.