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https://opencores.org/ocsvn/or1k_soc_on_altera_embedded_dev_kit/or1k_soc_on_altera_embedded_dev_kit/trunk
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[/] [or1k_soc_on_altera_embedded_dev_kit/] [trunk/] [linux-2.6/] [linux-2.6.24/] [net/] [ipv6/] [netfilter/] [ip6t_ah.c] - Rev 3
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/* 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. */ #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("IPv6 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("ah spi_match:%c 0x%x <= 0x%x <= 0x%x", invert ? '!' : ' ', min, spi, max); r = (spi >= min && spi <= max) ^ invert; pr_debug(" result %s\n", r ? "PASS" : "FAILED"); return r; } static bool match(const struct sk_buff *skb, const struct net_device *in, const struct net_device *out, const struct xt_match *match, const void *matchinfo, int offset, unsigned int protoff, bool *hotdrop) { struct ip_auth_hdr _ah; const struct ip_auth_hdr *ah; const struct ip6t_ah *ahinfo = matchinfo; unsigned int ptr; unsigned int hdrlen = 0; int err; err = ipv6_find_hdr(skb, &ptr, NEXTHDR_AUTH, NULL); if (err < 0) { if (err != -ENOENT) *hotdrop = true; return false; } ah = skb_header_pointer(skb, ptr, sizeof(_ah), &_ah); if (ah == NULL) { *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); } /* Called when user tries to insert an entry of this type. */ static bool checkentry(const char *tablename, const void *entry, const struct xt_match *match, void *matchinfo, unsigned int hook_mask) { const struct ip6t_ah *ahinfo = matchinfo; if (ahinfo->invflags & ~IP6T_AH_INV_MASK) { pr_debug("ip6t_ah: unknown flags %X\n", ahinfo->invflags); return false; } return true; } static struct xt_match ah_match __read_mostly = { .name = "ah", .family = AF_INET6, .match = match, .matchsize = sizeof(struct ip6t_ah), .checkentry = checkentry, .me = THIS_MODULE, }; static int __init ip6t_ah_init(void) { return xt_register_match(&ah_match); } static void __exit ip6t_ah_fini(void) { xt_unregister_match(&ah_match); } module_init(ip6t_ah_init); module_exit(ip6t_ah_fini);