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803 lines
18 KiB
803 lines
18 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright (C)2002 USAGI/WIDE Project |
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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 <[email protected]> |
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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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|
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#define pr_fmt(fmt) "IPv6: " fmt |
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|
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#include <crypto/algapi.h> |
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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[]; |
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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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fallthrough; |
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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->sk, 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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err = skb_to_sgvec_nomark(skb, sg, 0, skb->len); |
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if (unlikely(err < 0)) |
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goto out_free; |
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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 == -ENOSPC) |
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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 = ipv6_authlen(ah); |
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if (err) |
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goto out; |
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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 = crypto_memneq(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) |
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{ |
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/* |
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* Before process AH |
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* [IPv6][Ext1][Ext2][AH][Dest][Payload] |
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* |<-------------->| hdr_len |
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* |
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* To erase AH: |
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* Keeping copy of cleared headers. After AH processing, |
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* Moving the pointer of skb->network_header by using skb_pull as long |
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* as AH header length. Then copy back the copy as long as hdr_len |
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* If destination header following AH exists, copy it into after [Ext2]. |
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* |
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* |<>|[IPv6][Ext1][Ext2][Dest][Payload] |
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* There is offset of AH before IPv6 header after the process. |
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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 *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 ip_auth_hdr *ah; |
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struct ipv6hdr *ip6h; |
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struct ah_data *ahp; |
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u16 hdr_len; |
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u16 ah_hlen; |
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int nexthdr; |
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int nfrags; |
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int err = -ENOMEM; |
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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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if (!pskb_may_pull(skb, sizeof(struct ip_auth_hdr))) |
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goto out; |
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|
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/* We are going to _remove_ AH header to keep sockets happy, |
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* so... Later this can change. */ |
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if (skb_unclone(skb, GFP_ATOMIC)) |
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goto out; |
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skb->ip_summed = CHECKSUM_NONE; |
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hdr_len = skb_network_header_len(skb); |
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ah = (struct ip_auth_hdr *)skb->data; |
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ahp = x->data; |
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ahash = ahp->ahash; |
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nexthdr = ah->nexthdr; |
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ah_hlen = ipv6_authlen(ah); |
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if (ah_hlen != XFRM_ALIGN8(sizeof(*ah) + ahp->icv_full_len) && |
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ah_hlen != XFRM_ALIGN8(sizeof(*ah) + ahp->icv_trunc_len)) |
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goto out; |
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if (!pskb_may_pull(skb, ah_hlen)) |
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goto out; |
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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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ah = (struct ip_auth_hdr *)skb->data; |
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ip6h = ipv6_hdr(skb); |
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|
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skb_push(skb, hdr_len); |
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|
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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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|
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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); |
|
|
|
err = ipv6_clear_mutable_options(ip6h, hdr_len, XFRM_POLICY_IN); |
|
if (err) |
|
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); |
|
err = skb_to_sgvec_nomark(skb, sg, 0, skb->len); |
|
if (unlikely(err < 0)) |
|
goto out_free; |
|
|
|
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 = crypto_memneq(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, |
|
sock_net_uid(net, NULL)); |
|
else |
|
ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL)); |
|
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 != %u\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 = { |
|
.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, |
|
}; |
|
|
|
static struct xfrm6_protocol ah6_protocol = { |
|
.handler = xfrm6_rcv, |
|
.input_handler = xfrm_input, |
|
.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__); |
|
|
|
xfrm_unregister_type(&ah6_type, AF_INET6); |
|
} |
|
|
|
module_init(ah6_init); |
|
module_exit(ah6_fini); |
|
|
|
MODULE_LICENSE("GPL"); |
|
MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_AH);
|
|
|