Release 4.15 net/netfilter/xt_esp.c
/* Kernel module to match ESP parameters. */
/* (C) 1999-2000 Yon Uriarte <yon@astaro.de>
*
* 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/in.h>
#include <linux/ip.h>
#include <linux/netfilter/xt_esp.h>
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter_ipv4/ip_tables.h>
#include <linux/netfilter_ipv6/ip6_tables.h>
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Yon Uriarte <yon@astaro.de>");
MODULE_DESCRIPTION("Xtables: IPsec-ESP packet match");
MODULE_ALIAS("ipt_esp");
MODULE_ALIAS("ip6t_esp");
/* 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 |
| Linus Torvalds | 61 | 91.04% | 1 | 25.00% |
| Jan Engelhardt | 6 | 8.96% | 3 | 75.00% |
| Total | 67 | 100.00% | 4 | 100.00% |
static bool esp_mt(const struct sk_buff *skb, struct xt_action_param *par)
{
const struct ip_esp_hdr *eh;
struct ip_esp_hdr _esp;
const struct xt_esp *espinfo = par->matchinfo;
/* Must not be a fragment. */
if (par->fragoff != 0)
return false;
eh = skb_header_pointer(skb, par->thoff, sizeof(_esp), &_esp);
if (eh == NULL) {
/* We've been asked to examine this packet, and we
* can't. Hence, no choice but to drop.
*/
pr_debug("Dropping evil ESP tinygram.\n");
par->hotdrop = true;
return false;
}
return spi_match(espinfo->spis[0], espinfo->spis[1], ntohl(eh->spi),
!!(espinfo->invflags & XT_ESP_INV_SPI));
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Linus Torvalds | 71 | 56.35% | 1 | 8.33% |
| Jan Engelhardt | 25 | 19.84% | 7 | 58.33% |
| David S. Miller | 18 | 14.29% | 1 | 8.33% |
| Rusty Russell | 9 | 7.14% | 1 | 8.33% |
| Yasuyuki Kozakai | 2 | 1.59% | 1 | 8.33% |
| Harald Welte | 1 | 0.79% | 1 | 8.33% |
| Total | 126 | 100.00% | 12 | 100.00% |
static int esp_mt_check(const struct xt_mtchk_param *par)
{
const struct xt_esp *espinfo = par->matchinfo;
if (espinfo->invflags & ~XT_ESP_INV_MASK) {
pr_debug("unknown flags %X\n", espinfo->invflags);
return -EINVAL;
}
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Linus Torvalds | 34 | 69.39% | 1 | 12.50% |
| Jan Engelhardt | 11 | 22.45% | 5 | 62.50% |
| Yasuyuki Kozakai | 2 | 4.08% | 1 | 12.50% |
| Patrick McHardy | 2 | 4.08% | 1 | 12.50% |
| Total | 49 | 100.00% | 8 | 100.00% |
static struct xt_match esp_mt_reg[] __read_mostly = {
{
.name = "esp",
.family = NFPROTO_IPV4,
.checkentry = esp_mt_check,
.match = esp_mt,
.matchsize = sizeof(struct xt_esp),
.proto = IPPROTO_ESP,
.me = THIS_MODULE,
},
{
.name = "esp",
.family = NFPROTO_IPV6,
.checkentry = esp_mt_check,
.match = esp_mt,
.matchsize = sizeof(struct xt_esp),
.proto = IPPROTO_ESP,
.me = THIS_MODULE,
},
};
static int __init esp_mt_init(void)
{
return xt_register_matches(esp_mt_reg, ARRAY_SIZE(esp_mt_reg));
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Linus Torvalds | 12 | 60.00% | 1 | 25.00% |
| Patrick McHardy | 4 | 20.00% | 1 | 25.00% |
| Jan Engelhardt | 3 | 15.00% | 1 | 25.00% |
| Yasuyuki Kozakai | 1 | 5.00% | 1 | 25.00% |
| Total | 20 | 100.00% | 4 | 100.00% |
static void __exit esp_mt_exit(void)
{
xt_unregister_matches(esp_mt_reg, ARRAY_SIZE(esp_mt_reg));
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Linus Torvalds | 9 | 47.37% | 1 | 25.00% |
| Patrick McHardy | 4 | 21.05% | 1 | 25.00% |
| Yasuyuki Kozakai | 3 | 15.79% | 1 | 25.00% |
| Jan Engelhardt | 3 | 15.79% | 1 | 25.00% |
| Total | 19 | 100.00% | 4 | 100.00% |
module_init(esp_mt_init);
module_exit(esp_mt_exit);
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Linus Torvalds | 223 | 50.57% | 1 | 4.00% |
| Yasuyuki Kozakai | 67 | 15.19% | 1 | 4.00% |
| Jan Engelhardt | 65 | 14.74% | 13 | 52.00% |
| Patrick McHardy | 33 | 7.48% | 4 | 16.00% |
| David S. Miller | 18 | 4.08% | 1 | 4.00% |
| Harald Welte | 14 | 3.17% | 3 | 12.00% |
| Art Haas | 12 | 2.72% | 1 | 4.00% |
| Rusty Russell | 9 | 2.04% | 1 | 4.00% |
| Total | 441 | 100.00% | 25 | 100.00% |
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