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25105051fd
Return a negative error code on failure. A simplified version of the semantic match that finds this problem is as follows: (http://coccinelle.lip6.fr/) // <smpl> @@ identifier ret; expression e1,e2; @@ ( if (\(ret < 0\|ret != 0\)) { ... return ret; } | ret = 0 ) ... when != ret = e1 when != &ret *if(...) { ... when != ret = e2 when forall return ret; } // </smpl> Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr> Acked-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
808 lines
18 KiB
C
808 lines
18 KiB
C
/*
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* Copyright (C)2002 USAGI/WIDE Project
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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 as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*
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* Authors
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*
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* Mitsuru KANDA @USAGI : IPv6 Support
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* Kazunori MIYAZAWA @USAGI :
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* Kunihiro Ishiguro <kunihiro@ipinfusion.com>
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*
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* This file is derived from net/ipv4/ah.c.
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*/
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#define pr_fmt(fmt) "IPv6: " fmt
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#include <crypto/hash.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <net/ip.h>
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#include <net/ah.h>
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#include <linux/crypto.h>
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#include <linux/pfkeyv2.h>
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#include <linux/string.h>
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#include <linux/scatterlist.h>
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#include <net/ip6_route.h>
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#include <net/icmp.h>
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#include <net/ipv6.h>
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#include <net/protocol.h>
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#include <net/xfrm.h>
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#define IPV6HDR_BASELEN 8
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struct tmp_ext {
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#if IS_ENABLED(CONFIG_IPV6_MIP6)
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struct in6_addr saddr;
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#endif
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struct in6_addr daddr;
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char hdrs[0];
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};
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struct ah_skb_cb {
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struct xfrm_skb_cb xfrm;
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void *tmp;
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};
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#define AH_SKB_CB(__skb) ((struct ah_skb_cb *)&((__skb)->cb[0]))
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static void *ah_alloc_tmp(struct crypto_ahash *ahash, int nfrags,
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unsigned int size)
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{
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unsigned int len;
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len = size + crypto_ahash_digestsize(ahash) +
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(crypto_ahash_alignmask(ahash) &
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~(crypto_tfm_ctx_alignment() - 1));
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len = ALIGN(len, crypto_tfm_ctx_alignment());
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len += sizeof(struct ahash_request) + crypto_ahash_reqsize(ahash);
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len = ALIGN(len, __alignof__(struct scatterlist));
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len += sizeof(struct scatterlist) * nfrags;
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return kmalloc(len, GFP_ATOMIC);
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}
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static inline struct tmp_ext *ah_tmp_ext(void *base)
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{
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return base + IPV6HDR_BASELEN;
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}
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static inline u8 *ah_tmp_auth(u8 *tmp, unsigned int offset)
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{
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return tmp + offset;
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}
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static inline u8 *ah_tmp_icv(struct crypto_ahash *ahash, void *tmp,
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unsigned int offset)
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{
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return PTR_ALIGN((u8 *)tmp + offset, crypto_ahash_alignmask(ahash) + 1);
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}
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static inline struct ahash_request *ah_tmp_req(struct crypto_ahash *ahash,
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u8 *icv)
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{
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struct ahash_request *req;
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req = (void *)PTR_ALIGN(icv + crypto_ahash_digestsize(ahash),
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crypto_tfm_ctx_alignment());
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ahash_request_set_tfm(req, ahash);
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return req;
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}
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static inline struct scatterlist *ah_req_sg(struct crypto_ahash *ahash,
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struct ahash_request *req)
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{
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return (void *)ALIGN((unsigned long)(req + 1) +
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crypto_ahash_reqsize(ahash),
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__alignof__(struct scatterlist));
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}
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static bool zero_out_mutable_opts(struct ipv6_opt_hdr *opthdr)
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{
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u8 *opt = (u8 *)opthdr;
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int len = ipv6_optlen(opthdr);
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int off = 0;
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int optlen = 0;
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off += 2;
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len -= 2;
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while (len > 0) {
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switch (opt[off]) {
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case IPV6_TLV_PAD1:
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optlen = 1;
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break;
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default:
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if (len < 2)
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goto bad;
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optlen = opt[off+1]+2;
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if (len < optlen)
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goto bad;
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if (opt[off] & 0x20)
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memset(&opt[off+2], 0, opt[off+1]);
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break;
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}
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off += optlen;
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len -= optlen;
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}
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if (len == 0)
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return true;
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bad:
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return false;
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}
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#if IS_ENABLED(CONFIG_IPV6_MIP6)
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/**
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* ipv6_rearrange_destopt - rearrange IPv6 destination options header
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* @iph: IPv6 header
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* @destopt: destionation options header
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*/
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static void ipv6_rearrange_destopt(struct ipv6hdr *iph, struct ipv6_opt_hdr *destopt)
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{
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u8 *opt = (u8 *)destopt;
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int len = ipv6_optlen(destopt);
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int off = 0;
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int optlen = 0;
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off += 2;
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len -= 2;
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while (len > 0) {
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switch (opt[off]) {
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case IPV6_TLV_PAD1:
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optlen = 1;
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break;
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default:
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if (len < 2)
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goto bad;
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optlen = opt[off+1]+2;
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if (len < optlen)
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goto bad;
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/* Rearrange the source address in @iph and the
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* addresses in home address option for final source.
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* See 11.3.2 of RFC 3775 for details.
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*/
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if (opt[off] == IPV6_TLV_HAO) {
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struct in6_addr final_addr;
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struct ipv6_destopt_hao *hao;
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hao = (struct ipv6_destopt_hao *)&opt[off];
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if (hao->length != sizeof(hao->addr)) {
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net_warn_ratelimited("destopt hao: invalid header length: %u\n",
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hao->length);
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goto bad;
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}
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final_addr = hao->addr;
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hao->addr = iph->saddr;
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iph->saddr = final_addr;
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}
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break;
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}
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off += optlen;
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len -= optlen;
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}
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/* Note: ok if len == 0 */
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bad:
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return;
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}
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#else
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static void ipv6_rearrange_destopt(struct ipv6hdr *iph, struct ipv6_opt_hdr *destopt) {}
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#endif
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/**
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* ipv6_rearrange_rthdr - rearrange IPv6 routing header
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* @iph: IPv6 header
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* @rthdr: routing header
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*
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* Rearrange the destination address in @iph and the addresses in @rthdr
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* so that they appear in the order they will at the final destination.
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* See Appendix A2 of RFC 2402 for details.
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*/
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static void ipv6_rearrange_rthdr(struct ipv6hdr *iph, struct ipv6_rt_hdr *rthdr)
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{
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int segments, segments_left;
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struct in6_addr *addrs;
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struct in6_addr final_addr;
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segments_left = rthdr->segments_left;
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if (segments_left == 0)
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return;
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rthdr->segments_left = 0;
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/* The value of rthdr->hdrlen has been verified either by the system
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* call if it is locally generated, or by ipv6_rthdr_rcv() for incoming
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* packets. So we can assume that it is even and that segments is
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* greater than or equal to segments_left.
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*
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* For the same reason we can assume that this option is of type 0.
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*/
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segments = rthdr->hdrlen >> 1;
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addrs = ((struct rt0_hdr *)rthdr)->addr;
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final_addr = addrs[segments - 1];
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addrs += segments - segments_left;
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memmove(addrs + 1, addrs, (segments_left - 1) * sizeof(*addrs));
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addrs[0] = iph->daddr;
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iph->daddr = final_addr;
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}
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static int ipv6_clear_mutable_options(struct ipv6hdr *iph, int len, int dir)
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{
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union {
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struct ipv6hdr *iph;
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struct ipv6_opt_hdr *opth;
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struct ipv6_rt_hdr *rth;
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char *raw;
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} exthdr = { .iph = iph };
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char *end = exthdr.raw + len;
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int nexthdr = iph->nexthdr;
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exthdr.iph++;
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while (exthdr.raw < end) {
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switch (nexthdr) {
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case NEXTHDR_DEST:
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if (dir == XFRM_POLICY_OUT)
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ipv6_rearrange_destopt(iph, exthdr.opth);
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case NEXTHDR_HOP:
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if (!zero_out_mutable_opts(exthdr.opth)) {
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net_dbg_ratelimited("overrun %sopts\n",
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nexthdr == NEXTHDR_HOP ?
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"hop" : "dest");
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return -EINVAL;
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}
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break;
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case NEXTHDR_ROUTING:
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ipv6_rearrange_rthdr(iph, exthdr.rth);
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break;
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default:
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return 0;
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}
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nexthdr = exthdr.opth->nexthdr;
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exthdr.raw += ipv6_optlen(exthdr.opth);
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}
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return 0;
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}
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static void ah6_output_done(struct crypto_async_request *base, int err)
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{
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int extlen;
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u8 *iph_base;
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u8 *icv;
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struct sk_buff *skb = base->data;
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struct xfrm_state *x = skb_dst(skb)->xfrm;
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struct ah_data *ahp = x->data;
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struct ipv6hdr *top_iph = ipv6_hdr(skb);
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struct ip_auth_hdr *ah = ip_auth_hdr(skb);
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struct tmp_ext *iph_ext;
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extlen = skb_network_header_len(skb) - sizeof(struct ipv6hdr);
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if (extlen)
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extlen += sizeof(*iph_ext);
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iph_base = AH_SKB_CB(skb)->tmp;
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iph_ext = ah_tmp_ext(iph_base);
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icv = ah_tmp_icv(ahp->ahash, iph_ext, extlen);
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memcpy(ah->auth_data, icv, ahp->icv_trunc_len);
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memcpy(top_iph, iph_base, IPV6HDR_BASELEN);
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if (extlen) {
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#if IS_ENABLED(CONFIG_IPV6_MIP6)
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memcpy(&top_iph->saddr, iph_ext, extlen);
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#else
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memcpy(&top_iph->daddr, iph_ext, extlen);
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#endif
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}
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kfree(AH_SKB_CB(skb)->tmp);
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xfrm_output_resume(skb, err);
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}
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static int ah6_output(struct xfrm_state *x, struct sk_buff *skb)
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{
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int err;
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int nfrags;
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int extlen;
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u8 *iph_base;
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u8 *icv;
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u8 nexthdr;
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struct sk_buff *trailer;
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struct crypto_ahash *ahash;
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struct ahash_request *req;
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struct scatterlist *sg;
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struct ipv6hdr *top_iph;
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struct ip_auth_hdr *ah;
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struct ah_data *ahp;
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struct tmp_ext *iph_ext;
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int seqhi_len = 0;
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__be32 *seqhi;
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int sglists = 0;
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struct scatterlist *seqhisg;
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ahp = x->data;
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ahash = ahp->ahash;
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err = skb_cow_data(skb, 0, &trailer);
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if (err < 0)
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goto out;
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nfrags = err;
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skb_push(skb, -skb_network_offset(skb));
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extlen = skb_network_header_len(skb) - sizeof(struct ipv6hdr);
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if (extlen)
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extlen += sizeof(*iph_ext);
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if (x->props.flags & XFRM_STATE_ESN) {
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sglists = 1;
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seqhi_len = sizeof(*seqhi);
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}
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err = -ENOMEM;
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iph_base = ah_alloc_tmp(ahash, nfrags + sglists, IPV6HDR_BASELEN +
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extlen + seqhi_len);
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if (!iph_base)
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goto out;
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iph_ext = ah_tmp_ext(iph_base);
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seqhi = (__be32 *)((char *)iph_ext + extlen);
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icv = ah_tmp_icv(ahash, seqhi, seqhi_len);
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req = ah_tmp_req(ahash, icv);
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sg = ah_req_sg(ahash, req);
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seqhisg = sg + nfrags;
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ah = ip_auth_hdr(skb);
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memset(ah->auth_data, 0, ahp->icv_trunc_len);
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top_iph = ipv6_hdr(skb);
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top_iph->payload_len = htons(skb->len - sizeof(*top_iph));
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nexthdr = *skb_mac_header(skb);
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*skb_mac_header(skb) = IPPROTO_AH;
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/* When there are no extension headers, we only need to save the first
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* 8 bytes of the base IP header.
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*/
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memcpy(iph_base, top_iph, IPV6HDR_BASELEN);
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if (extlen) {
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#if IS_ENABLED(CONFIG_IPV6_MIP6)
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memcpy(iph_ext, &top_iph->saddr, extlen);
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#else
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memcpy(iph_ext, &top_iph->daddr, extlen);
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#endif
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err = ipv6_clear_mutable_options(top_iph,
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extlen - sizeof(*iph_ext) +
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sizeof(*top_iph),
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XFRM_POLICY_OUT);
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if (err)
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goto out_free;
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}
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ah->nexthdr = nexthdr;
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top_iph->priority = 0;
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top_iph->flow_lbl[0] = 0;
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top_iph->flow_lbl[1] = 0;
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top_iph->flow_lbl[2] = 0;
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top_iph->hop_limit = 0;
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ah->hdrlen = (XFRM_ALIGN8(sizeof(*ah) + ahp->icv_trunc_len) >> 2) - 2;
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ah->reserved = 0;
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ah->spi = x->id.spi;
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ah->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.low);
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sg_init_table(sg, nfrags + sglists);
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skb_to_sgvec_nomark(skb, sg, 0, skb->len);
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if (x->props.flags & XFRM_STATE_ESN) {
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/* Attach seqhi sg right after packet payload */
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*seqhi = htonl(XFRM_SKB_CB(skb)->seq.output.hi);
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sg_set_buf(seqhisg, seqhi, seqhi_len);
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}
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ahash_request_set_crypt(req, sg, icv, skb->len + seqhi_len);
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ahash_request_set_callback(req, 0, ah6_output_done, skb);
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AH_SKB_CB(skb)->tmp = iph_base;
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err = crypto_ahash_digest(req);
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if (err) {
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if (err == -EINPROGRESS)
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goto out;
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if (err == -EBUSY)
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err = NET_XMIT_DROP;
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goto out_free;
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}
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memcpy(ah->auth_data, icv, ahp->icv_trunc_len);
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memcpy(top_iph, iph_base, IPV6HDR_BASELEN);
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if (extlen) {
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#if IS_ENABLED(CONFIG_IPV6_MIP6)
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memcpy(&top_iph->saddr, iph_ext, extlen);
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#else
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memcpy(&top_iph->daddr, iph_ext, extlen);
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#endif
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}
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out_free:
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kfree(iph_base);
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out:
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return err;
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}
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static void ah6_input_done(struct crypto_async_request *base, int err)
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{
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u8 *auth_data;
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u8 *icv;
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u8 *work_iph;
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struct sk_buff *skb = base->data;
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struct xfrm_state *x = xfrm_input_state(skb);
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struct ah_data *ahp = x->data;
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struct ip_auth_hdr *ah = ip_auth_hdr(skb);
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int hdr_len = skb_network_header_len(skb);
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int ah_hlen = (ah->hdrlen + 2) << 2;
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work_iph = AH_SKB_CB(skb)->tmp;
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auth_data = ah_tmp_auth(work_iph, hdr_len);
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icv = ah_tmp_icv(ahp->ahash, auth_data, ahp->icv_trunc_len);
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err = memcmp(icv, auth_data, ahp->icv_trunc_len) ? -EBADMSG : 0;
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if (err)
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goto out;
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err = ah->nexthdr;
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skb->network_header += ah_hlen;
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memcpy(skb_network_header(skb), work_iph, hdr_len);
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__skb_pull(skb, ah_hlen + hdr_len);
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if (x->props.mode == XFRM_MODE_TUNNEL)
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skb_reset_transport_header(skb);
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else
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skb_set_transport_header(skb, -hdr_len);
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out:
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kfree(AH_SKB_CB(skb)->tmp);
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xfrm_input_resume(skb, err);
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}
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static int ah6_input(struct xfrm_state *x, struct sk_buff *skb)
|
|
{
|
|
/*
|
|
* Before process AH
|
|
* [IPv6][Ext1][Ext2][AH][Dest][Payload]
|
|
* |<-------------->| hdr_len
|
|
*
|
|
* To erase AH:
|
|
* Keeping copy of cleared headers. After AH processing,
|
|
* Moving the pointer of skb->network_header by using skb_pull as long
|
|
* as AH header length. Then copy back the copy as long as hdr_len
|
|
* If destination header following AH exists, copy it into after [Ext2].
|
|
*
|
|
* |<>|[IPv6][Ext1][Ext2][Dest][Payload]
|
|
* There is offset of AH before IPv6 header after the process.
|
|
*/
|
|
|
|
u8 *auth_data;
|
|
u8 *icv;
|
|
u8 *work_iph;
|
|
struct sk_buff *trailer;
|
|
struct crypto_ahash *ahash;
|
|
struct ahash_request *req;
|
|
struct scatterlist *sg;
|
|
struct ip_auth_hdr *ah;
|
|
struct ipv6hdr *ip6h;
|
|
struct ah_data *ahp;
|
|
u16 hdr_len;
|
|
u16 ah_hlen;
|
|
int nexthdr;
|
|
int nfrags;
|
|
int err = -ENOMEM;
|
|
int seqhi_len = 0;
|
|
__be32 *seqhi;
|
|
int sglists = 0;
|
|
struct scatterlist *seqhisg;
|
|
|
|
if (!pskb_may_pull(skb, sizeof(struct ip_auth_hdr)))
|
|
goto out;
|
|
|
|
/* We are going to _remove_ AH header to keep sockets happy,
|
|
* so... Later this can change. */
|
|
if (skb_unclone(skb, GFP_ATOMIC))
|
|
goto out;
|
|
|
|
skb->ip_summed = CHECKSUM_NONE;
|
|
|
|
hdr_len = skb_network_header_len(skb);
|
|
ah = (struct ip_auth_hdr *)skb->data;
|
|
ahp = x->data;
|
|
ahash = ahp->ahash;
|
|
|
|
nexthdr = ah->nexthdr;
|
|
ah_hlen = (ah->hdrlen + 2) << 2;
|
|
|
|
if (ah_hlen != XFRM_ALIGN8(sizeof(*ah) + ahp->icv_full_len) &&
|
|
ah_hlen != XFRM_ALIGN8(sizeof(*ah) + ahp->icv_trunc_len))
|
|
goto out;
|
|
|
|
if (!pskb_may_pull(skb, ah_hlen))
|
|
goto out;
|
|
|
|
err = skb_cow_data(skb, 0, &trailer);
|
|
if (err < 0)
|
|
goto out;
|
|
nfrags = err;
|
|
|
|
ah = (struct ip_auth_hdr *)skb->data;
|
|
ip6h = ipv6_hdr(skb);
|
|
|
|
skb_push(skb, hdr_len);
|
|
|
|
if (x->props.flags & XFRM_STATE_ESN) {
|
|
sglists = 1;
|
|
seqhi_len = sizeof(*seqhi);
|
|
}
|
|
|
|
work_iph = ah_alloc_tmp(ahash, nfrags + sglists, hdr_len +
|
|
ahp->icv_trunc_len + seqhi_len);
|
|
if (!work_iph) {
|
|
err = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
auth_data = ah_tmp_auth((u8 *)work_iph, hdr_len);
|
|
seqhi = (__be32 *)(auth_data + ahp->icv_trunc_len);
|
|
icv = ah_tmp_icv(ahash, seqhi, seqhi_len);
|
|
req = ah_tmp_req(ahash, icv);
|
|
sg = ah_req_sg(ahash, req);
|
|
seqhisg = sg + nfrags;
|
|
|
|
memcpy(work_iph, ip6h, hdr_len);
|
|
memcpy(auth_data, ah->auth_data, ahp->icv_trunc_len);
|
|
memset(ah->auth_data, 0, ahp->icv_trunc_len);
|
|
|
|
if (ipv6_clear_mutable_options(ip6h, hdr_len, XFRM_POLICY_IN))
|
|
goto out_free;
|
|
|
|
ip6h->priority = 0;
|
|
ip6h->flow_lbl[0] = 0;
|
|
ip6h->flow_lbl[1] = 0;
|
|
ip6h->flow_lbl[2] = 0;
|
|
ip6h->hop_limit = 0;
|
|
|
|
sg_init_table(sg, nfrags + sglists);
|
|
skb_to_sgvec_nomark(skb, sg, 0, skb->len);
|
|
|
|
if (x->props.flags & XFRM_STATE_ESN) {
|
|
/* Attach seqhi sg right after packet payload */
|
|
*seqhi = XFRM_SKB_CB(skb)->seq.input.hi;
|
|
sg_set_buf(seqhisg, seqhi, seqhi_len);
|
|
}
|
|
|
|
ahash_request_set_crypt(req, sg, icv, skb->len + seqhi_len);
|
|
ahash_request_set_callback(req, 0, ah6_input_done, skb);
|
|
|
|
AH_SKB_CB(skb)->tmp = work_iph;
|
|
|
|
err = crypto_ahash_digest(req);
|
|
if (err) {
|
|
if (err == -EINPROGRESS)
|
|
goto out;
|
|
|
|
goto out_free;
|
|
}
|
|
|
|
err = memcmp(icv, auth_data, ahp->icv_trunc_len) ? -EBADMSG : 0;
|
|
if (err)
|
|
goto out_free;
|
|
|
|
skb->network_header += ah_hlen;
|
|
memcpy(skb_network_header(skb), work_iph, hdr_len);
|
|
__skb_pull(skb, ah_hlen + hdr_len);
|
|
|
|
if (x->props.mode == XFRM_MODE_TUNNEL)
|
|
skb_reset_transport_header(skb);
|
|
else
|
|
skb_set_transport_header(skb, -hdr_len);
|
|
|
|
err = nexthdr;
|
|
|
|
out_free:
|
|
kfree(work_iph);
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static int ah6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
|
|
u8 type, u8 code, int offset, __be32 info)
|
|
{
|
|
struct net *net = dev_net(skb->dev);
|
|
struct ipv6hdr *iph = (struct ipv6hdr *)skb->data;
|
|
struct ip_auth_hdr *ah = (struct ip_auth_hdr *)(skb->data+offset);
|
|
struct xfrm_state *x;
|
|
|
|
if (type != ICMPV6_PKT_TOOBIG &&
|
|
type != NDISC_REDIRECT)
|
|
return 0;
|
|
|
|
x = xfrm_state_lookup(net, skb->mark, (xfrm_address_t *)&iph->daddr, ah->spi, IPPROTO_AH, AF_INET6);
|
|
if (!x)
|
|
return 0;
|
|
|
|
if (type == NDISC_REDIRECT)
|
|
ip6_redirect(skb, net, skb->dev->ifindex, 0);
|
|
else
|
|
ip6_update_pmtu(skb, net, info, 0, 0);
|
|
xfrm_state_put(x);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ah6_init_state(struct xfrm_state *x)
|
|
{
|
|
struct ah_data *ahp = NULL;
|
|
struct xfrm_algo_desc *aalg_desc;
|
|
struct crypto_ahash *ahash;
|
|
|
|
if (!x->aalg)
|
|
goto error;
|
|
|
|
if (x->encap)
|
|
goto error;
|
|
|
|
ahp = kzalloc(sizeof(*ahp), GFP_KERNEL);
|
|
if (!ahp)
|
|
return -ENOMEM;
|
|
|
|
ahash = crypto_alloc_ahash(x->aalg->alg_name, 0, 0);
|
|
if (IS_ERR(ahash))
|
|
goto error;
|
|
|
|
ahp->ahash = ahash;
|
|
if (crypto_ahash_setkey(ahash, x->aalg->alg_key,
|
|
(x->aalg->alg_key_len + 7) / 8))
|
|
goto error;
|
|
|
|
/*
|
|
* Lookup the algorithm description maintained by xfrm_algo,
|
|
* verify crypto transform properties, and store information
|
|
* we need for AH processing. This lookup cannot fail here
|
|
* after a successful crypto_alloc_hash().
|
|
*/
|
|
aalg_desc = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
|
|
BUG_ON(!aalg_desc);
|
|
|
|
if (aalg_desc->uinfo.auth.icv_fullbits/8 !=
|
|
crypto_ahash_digestsize(ahash)) {
|
|
pr_info("AH: %s digestsize %u != %hu\n",
|
|
x->aalg->alg_name, crypto_ahash_digestsize(ahash),
|
|
aalg_desc->uinfo.auth.icv_fullbits/8);
|
|
goto error;
|
|
}
|
|
|
|
ahp->icv_full_len = aalg_desc->uinfo.auth.icv_fullbits/8;
|
|
ahp->icv_trunc_len = x->aalg->alg_trunc_len/8;
|
|
|
|
x->props.header_len = XFRM_ALIGN8(sizeof(struct ip_auth_hdr) +
|
|
ahp->icv_trunc_len);
|
|
switch (x->props.mode) {
|
|
case XFRM_MODE_BEET:
|
|
case XFRM_MODE_TRANSPORT:
|
|
break;
|
|
case XFRM_MODE_TUNNEL:
|
|
x->props.header_len += sizeof(struct ipv6hdr);
|
|
break;
|
|
default:
|
|
goto error;
|
|
}
|
|
x->data = ahp;
|
|
|
|
return 0;
|
|
|
|
error:
|
|
if (ahp) {
|
|
crypto_free_ahash(ahp->ahash);
|
|
kfree(ahp);
|
|
}
|
|
return -EINVAL;
|
|
}
|
|
|
|
static void ah6_destroy(struct xfrm_state *x)
|
|
{
|
|
struct ah_data *ahp = x->data;
|
|
|
|
if (!ahp)
|
|
return;
|
|
|
|
crypto_free_ahash(ahp->ahash);
|
|
kfree(ahp);
|
|
}
|
|
|
|
static int ah6_rcv_cb(struct sk_buff *skb, int err)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static const struct xfrm_type ah6_type = {
|
|
.description = "AH6",
|
|
.owner = THIS_MODULE,
|
|
.proto = IPPROTO_AH,
|
|
.flags = XFRM_TYPE_REPLAY_PROT,
|
|
.init_state = ah6_init_state,
|
|
.destructor = ah6_destroy,
|
|
.input = ah6_input,
|
|
.output = ah6_output,
|
|
.hdr_offset = xfrm6_find_1stfragopt,
|
|
};
|
|
|
|
static struct xfrm6_protocol ah6_protocol = {
|
|
.handler = xfrm6_rcv,
|
|
.cb_handler = ah6_rcv_cb,
|
|
.err_handler = ah6_err,
|
|
.priority = 0,
|
|
};
|
|
|
|
static int __init ah6_init(void)
|
|
{
|
|
if (xfrm_register_type(&ah6_type, AF_INET6) < 0) {
|
|
pr_info("%s: can't add xfrm type\n", __func__);
|
|
return -EAGAIN;
|
|
}
|
|
|
|
if (xfrm6_protocol_register(&ah6_protocol, IPPROTO_AH) < 0) {
|
|
pr_info("%s: can't add protocol\n", __func__);
|
|
xfrm_unregister_type(&ah6_type, AF_INET6);
|
|
return -EAGAIN;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __exit ah6_fini(void)
|
|
{
|
|
if (xfrm6_protocol_deregister(&ah6_protocol, IPPROTO_AH) < 0)
|
|
pr_info("%s: can't remove protocol\n", __func__);
|
|
|
|
if (xfrm_unregister_type(&ah6_type, AF_INET6) < 0)
|
|
pr_info("%s: can't remove xfrm type\n", __func__);
|
|
|
|
}
|
|
|
|
module_init(ah6_init);
|
|
module_exit(ah6_fini);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_AH);
|