mirror of
https://github.com/team-infusion-developers/android_kernel_samsung_msm8976.git
synced 2024-10-19 09:59:04 +00:00
1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
208 lines
4.9 KiB
C
208 lines
4.9 KiB
C
/* Kernel module to match AH 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/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_ah.h>
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("IPv6 AH 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("ah 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_auth_hdr *ah = NULL, _ah;
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const struct ip6t_ah *ahinfo = matchinfo;
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unsigned int temp;
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int len;
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u8 nexthdr;
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unsigned int ptr;
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unsigned int hdrlen = 0;
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/*DEBUGP("IPv6 AH entered\n");*/
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/* if (opt->auth == 0) return 0;
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* It does not filled on output */
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/* type of the 1st exthdr */
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nexthdr = skb->nh.ipv6h->nexthdr;
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/* pointer to the 1st exthdr */
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ptr = sizeof(struct ipv6hdr);
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/* available length */
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len = skb->len - ptr;
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temp = 0;
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while (ip6t_ext_hdr(nexthdr)) {
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struct ipv6_opt_hdr _hdr, *hp;
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DEBUGP("ipv6_ah header iteration \n");
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/* Is there enough space for the next ext header? */
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if (len < sizeof(struct ipv6_opt_hdr))
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return 0;
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/* No more exthdr -> evaluate */
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if (nexthdr == NEXTHDR_NONE)
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break;
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/* ESP -> evaluate */
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if (nexthdr == NEXTHDR_ESP)
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break;
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hp = skb_header_pointer(skb, ptr, sizeof(_hdr), &_hdr);
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BUG_ON(hp == NULL);
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/* Calculate the header length */
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if (nexthdr == NEXTHDR_FRAGMENT)
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hdrlen = 8;
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else if (nexthdr == NEXTHDR_AUTH)
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hdrlen = (hp->hdrlen+2)<<2;
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else
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hdrlen = ipv6_optlen(hp);
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/* AH -> evaluate */
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if (nexthdr == NEXTHDR_AUTH) {
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temp |= MASK_AH;
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break;
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}
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/* set the flag */
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switch (nexthdr) {
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case NEXTHDR_HOP:
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case NEXTHDR_ROUTING:
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case NEXTHDR_FRAGMENT:
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case NEXTHDR_AUTH:
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case NEXTHDR_DEST:
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break;
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default:
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DEBUGP("ipv6_ah match: unknown nextheader %u\n",nexthdr);
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return 0;
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}
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nexthdr = hp->nexthdr;
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len -= hdrlen;
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ptr += hdrlen;
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if (ptr > skb->len) {
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DEBUGP("ipv6_ah: new pointer too large! \n");
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break;
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}
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}
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/* AH header not found */
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if (temp != MASK_AH)
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return 0;
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if (len < sizeof(struct ip_auth_hdr)){
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*hotdrop = 1;
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return 0;
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}
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ah = skb_header_pointer(skb, ptr, sizeof(_ah), &_ah);
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BUG_ON(ah == NULL);
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DEBUGP("IPv6 AH LEN %u %u ", hdrlen, ah->hdrlen);
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DEBUGP("RES %04X ", ah->reserved);
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DEBUGP("SPI %u %08X\n", ntohl(ah->spi), ntohl(ah->spi));
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DEBUGP("IPv6 AH spi %02X ",
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(spi_match(ahinfo->spis[0], ahinfo->spis[1],
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ntohl(ah->spi),
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!!(ahinfo->invflags & IP6T_AH_INV_SPI))));
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DEBUGP("len %02X %04X %02X ",
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ahinfo->hdrlen, hdrlen,
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(!ahinfo->hdrlen ||
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(ahinfo->hdrlen == hdrlen) ^
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!!(ahinfo->invflags & IP6T_AH_INV_LEN)));
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DEBUGP("res %02X %04X %02X\n",
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ahinfo->hdrres, ah->reserved,
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!(ahinfo->hdrres && ah->reserved));
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return (ah != NULL)
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&&
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(spi_match(ahinfo->spis[0], ahinfo->spis[1],
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ntohl(ah->spi),
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!!(ahinfo->invflags & IP6T_AH_INV_SPI)))
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&&
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(!ahinfo->hdrlen ||
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(ahinfo->hdrlen == hdrlen) ^
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!!(ahinfo->invflags & IP6T_AH_INV_LEN))
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&&
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!(ahinfo->hdrres && ah->reserved);
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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 struct ip6t_ip6 *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_ah *ahinfo = matchinfo;
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if (matchinfosize != IP6T_ALIGN(sizeof(struct ip6t_ah))) {
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DEBUGP("ip6t_ah: matchsize %u != %u\n",
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matchinfosize, IP6T_ALIGN(sizeof(struct ip6t_ah)));
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return 0;
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}
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if (ahinfo->invflags & ~IP6T_AH_INV_MASK) {
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DEBUGP("ip6t_ah: unknown flags %X\n", ahinfo->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 ah_match = {
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.name = "ah",
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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(&ah_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(&ah_match);
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}
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module_init(init);
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module_exit(cleanup);
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