Release 4.7 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 | harald welte | 59 | 88.06% | 1 | 25.00% |
| jan engelhardt | jan engelhardt | 4 | 5.97% | 2 | 50.00% |
| patrick mchardy | 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 | harald welte | 270 | 76.49% | 1 | 7.14% |
| yasuyuki kozakai | yasuyuki kozakai | 30 | 8.50% | 2 | 14.29% |
| patrick mchardy | patrick mchardy | 29 | 8.22% | 3 | 21.43% |
| jan engelhardt | jan engelhardt | 19 | 5.38% | 6 | 42.86% |
| hans schillstrom | hans schillstrom | 4 | 1.13% | 1 | 7.14% |
| david s. miller | 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 | harald welte | 36 | 73.47% | 1 | 12.50% |
| jan engelhardt | jan engelhardt | 10 | 20.41% | 5 | 62.50% |
| patrick mchardy | 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 | harald welte | 13 | 81.25% | 1 | 33.33% |
| jan engelhardt | 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 | harald welte | 12 | 80.00% | 1 | 33.33% |
| jan engelhardt | 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 | harald welte | 449 | 73.97% | 2 | 7.41% |
| jan engelhardt | jan engelhardt | 61 | 10.05% | 13 | 48.15% |
| patrick mchardy | patrick mchardy | 46 | 7.58% | 6 | 22.22% |
| yasuyuki kozakai | yasuyuki kozakai | 30 | 4.94% | 2 | 7.41% |
| art haas | art haas | 13 | 2.14% | 1 | 3.70% |
| hans schillstrom | hans schillstrom | 4 | 0.66% | 1 | 3.70% |
| arnaldo carvalho de melo | arnaldo carvalho de melo | 3 | 0.49% | 1 | 3.70% |
| david s. miller | david s. miller | 1 | 0.16% | 1 | 3.70% |
| Total | 607 | 100.00% | 27 | 100.00% |
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