mirror of
https://github.com/team-infusion-developers/android_kernel_samsung_msm8976.git
synced 2024-10-21 02:49:11 +00:00
2e4e6a17af
This monster-patch tries to do the best job for unifying the data structures and backend interfaces for the three evil clones ip_tables, ip6_tables and arp_tables. In an ideal world we would never have allowed this kind of copy+paste programming... but well, our world isn't (yet?) ideal. o introduce a new x_tables module o {ip,arp,ip6}_tables depend on this x_tables module o registration functions for tables, matches and targets are only wrappers around x_tables provided functions o all matches/targets that are used from ip_tables and ip6_tables are now implemented as xt_FOOBAR.c files and provide module aliases to ipt_FOOBAR and ip6t_FOOBAR o header files for xt_matches are in include/linux/netfilter/, include/linux/netfilter_{ipv4,ipv6} contains compatibility wrappers around the xt_FOOBAR.h headers Based on this patchset we're going to further unify the code, gradually getting rid of all the layer 3 specific assumptions. Signed-off-by: Harald Welte <laforge@netfilter.org> Signed-off-by: David S. Miller <davem@davemloft.net>
117 lines
2.7 KiB
C
117 lines
2.7 KiB
C
/* Kernel module to match ESP parameters. */
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/* (C) 2001-2002 Andras Kis-Szabo <kisza@sch.bme.hu>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/skbuff.h>
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#include <linux/ip.h>
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#include <linux/ipv6.h>
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#include <linux/types.h>
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#include <net/checksum.h>
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#include <net/ipv6.h>
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#include <linux/netfilter_ipv6/ip6_tables.h>
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#include <linux/netfilter_ipv6/ip6t_esp.h>
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("IPv6 ESP match");
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MODULE_AUTHOR("Andras Kis-Szabo <kisza@sch.bme.hu>");
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#if 0
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#define DEBUGP printk
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#else
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#define DEBUGP(format, args...)
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#endif
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/* Returns 1 if the spi is matched by the range, 0 otherwise */
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static inline int
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spi_match(u_int32_t min, u_int32_t max, u_int32_t spi, int invert)
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{
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int r=0;
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DEBUGP("esp spi_match:%c 0x%x <= 0x%x <= 0x%x",invert? '!':' ',
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min,spi,max);
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r=(spi >= min && spi <= max) ^ invert;
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DEBUGP(" result %s\n",r? "PASS\n" : "FAILED\n");
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return r;
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}
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static int
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match(const struct sk_buff *skb,
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const struct net_device *in,
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const struct net_device *out,
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const void *matchinfo,
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int offset,
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unsigned int protoff,
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int *hotdrop)
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{
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struct ip_esp_hdr _esp, *eh;
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const struct ip6t_esp *espinfo = matchinfo;
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unsigned int ptr;
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/* Make sure this isn't an evil packet */
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/*DEBUGP("ipv6_esp entered \n");*/
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if (ipv6_find_hdr(skb, &ptr, NEXTHDR_ESP, NULL) < 0)
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return 0;
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eh = skb_header_pointer(skb, ptr, sizeof(_esp), &_esp);
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if (eh == NULL) {
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*hotdrop = 1;
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return 0;
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}
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DEBUGP("IPv6 ESP SPI %u %08X\n", ntohl(eh->spi), ntohl(eh->spi));
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return (eh != NULL)
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&& spi_match(espinfo->spis[0], espinfo->spis[1],
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ntohl(eh->spi),
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!!(espinfo->invflags & IP6T_ESP_INV_SPI));
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}
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/* Called when user tries to insert an entry of this type. */
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static int
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checkentry(const char *tablename,
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const void *ip,
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void *matchinfo,
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unsigned int matchinfosize,
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unsigned int hook_mask)
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{
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const struct ip6t_esp *espinfo = matchinfo;
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if (matchinfosize != IP6T_ALIGN(sizeof(struct ip6t_esp))) {
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DEBUGP("ip6t_esp: matchsize %u != %u\n",
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matchinfosize, IP6T_ALIGN(sizeof(struct ip6t_esp)));
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return 0;
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}
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if (espinfo->invflags & ~IP6T_ESP_INV_MASK) {
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DEBUGP("ip6t_esp: unknown flags %X\n",
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espinfo->invflags);
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return 0;
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}
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return 1;
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}
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static struct ip6t_match esp_match = {
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.name = "esp",
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.match = &match,
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.checkentry = &checkentry,
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.me = THIS_MODULE,
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};
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static int __init init(void)
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{
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return ip6t_register_match(&esp_match);
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}
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static void __exit cleanup(void)
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{
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ip6t_unregister_match(&esp_match);
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}
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module_init(init);
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module_exit(cleanup);
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