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net/ipv6/ah6.c
17.9 KB
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// SPDX-License-Identifier: GPL-2.0-or-later |
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/* * Copyright (C)2002 USAGI/WIDE Project |
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* |
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* Authors * |
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* Mitsuru KANDA @USAGI : IPv6 Support |
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* Kazunori MIYAZAWA @USAGI : * 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/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> #include <net/ah.h> #include <linux/crypto.h> #include <linux/pfkeyv2.h> #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> #include <net/ipv6.h> |
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#include <net/protocol.h> |
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#include <net/xfrm.h> |
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|
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#define IPV6HDR_BASELEN 8 struct tmp_ext { |
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#if IS_ENABLED(CONFIG_IPV6_MIP6) |
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struct in6_addr saddr; #endif struct in6_addr daddr; |
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char hdrs[]; |
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}; struct ah_skb_cb { struct xfrm_skb_cb xfrm; void *tmp; }; #define AH_SKB_CB(__skb) ((struct ah_skb_cb *)&((__skb)->cb[0])) static void *ah_alloc_tmp(struct crypto_ahash *ahash, int nfrags, unsigned int size) { unsigned int len; len = size + crypto_ahash_digestsize(ahash) + (crypto_ahash_alignmask(ahash) & ~(crypto_tfm_ctx_alignment() - 1)); len = ALIGN(len, crypto_tfm_ctx_alignment()); len += sizeof(struct ahash_request) + crypto_ahash_reqsize(ahash); len = ALIGN(len, __alignof__(struct scatterlist)); len += sizeof(struct scatterlist) * nfrags; return kmalloc(len, GFP_ATOMIC); } static inline struct tmp_ext *ah_tmp_ext(void *base) { return base + IPV6HDR_BASELEN; } static inline u8 *ah_tmp_auth(u8 *tmp, unsigned int offset) { return tmp + offset; } static inline u8 *ah_tmp_icv(struct crypto_ahash *ahash, void *tmp, unsigned int offset) { return PTR_ALIGN((u8 *)tmp + offset, crypto_ahash_alignmask(ahash) + 1); } static inline struct ahash_request *ah_tmp_req(struct crypto_ahash *ahash, u8 *icv) { struct ahash_request *req; req = (void *)PTR_ALIGN(icv + crypto_ahash_digestsize(ahash), crypto_tfm_ctx_alignment()); ahash_request_set_tfm(req, ahash); return req; } static inline struct scatterlist *ah_req_sg(struct crypto_ahash *ahash, struct ahash_request *req) { return (void *)ALIGN((unsigned long)(req + 1) + crypto_ahash_reqsize(ahash), __alignof__(struct scatterlist)); } |
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static bool zero_out_mutable_opts(struct ipv6_opt_hdr *opthdr) |
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{ u8 *opt = (u8 *)opthdr; int len = ipv6_optlen(opthdr); int off = 0; int optlen = 0; off += 2; len -= 2; while (len > 0) { switch (opt[off]) { |
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case IPV6_TLV_PAD1: |
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optlen = 1; break; default: |
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if (len < 2) |
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goto bad; optlen = opt[off+1]+2; if (len < optlen) goto bad; if (opt[off] & 0x20) memset(&opt[off+2], 0, opt[off+1]); break; } off += optlen; len -= optlen; } 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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/** * ipv6_rearrange_destopt - rearrange IPv6 destination options header * @iph: IPv6 header * @destopt: destionation options header */ static void ipv6_rearrange_destopt(struct ipv6hdr *iph, struct ipv6_opt_hdr *destopt) { u8 *opt = (u8 *)destopt; int len = ipv6_optlen(destopt); int off = 0; int optlen = 0; off += 2; len -= 2; while (len > 0) { switch (opt[off]) { |
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case IPV6_TLV_PAD1: |
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optlen = 1; break; default: if (len < 2) goto bad; optlen = opt[off+1]+2; if (len < optlen) goto bad; /* Rearrange the source address in @iph and the * addresses in home address option for final source. * See 11.3.2 of RFC 3775 for details. */ if (opt[off] == IPV6_TLV_HAO) { struct in6_addr final_addr; struct ipv6_destopt_hao *hao; hao = (struct ipv6_destopt_hao *)&opt[off]; if (hao->length != sizeof(hao->addr)) { |
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net_warn_ratelimited("destopt hao: invalid header length: %u ", hao->length); |
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goto bad; } |
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final_addr = hao->addr; hao->addr = iph->saddr; iph->saddr = final_addr; |
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} break; } off += optlen; len -= optlen; } |
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/* Note: ok if len == 0 */ |
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bad: return; } |
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#else static void ipv6_rearrange_destopt(struct ipv6hdr *iph, struct ipv6_opt_hdr *destopt) {} |
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#endif |
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/** * ipv6_rearrange_rthdr - rearrange IPv6 routing header * @iph: IPv6 header * @rthdr: routing header * * Rearrange the destination address in @iph and the addresses in @rthdr * so that they appear in the order they will at the final destination. * See Appendix A2 of RFC 2402 for details. */ static void ipv6_rearrange_rthdr(struct ipv6hdr *iph, struct ipv6_rt_hdr *rthdr) { int segments, segments_left; struct in6_addr *addrs; struct in6_addr final_addr; segments_left = rthdr->segments_left; if (segments_left == 0) 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 * call if it is locally generated, or by ipv6_rthdr_rcv() for incoming * packets. So we can assume that it is even and that segments is * greater than or equal to segments_left. * * For the same reason we can assume that this option is of type 0. */ segments = rthdr->hdrlen >> 1; addrs = ((struct rt0_hdr *)rthdr)->addr; |
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final_addr = addrs[segments - 1]; |
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addrs += segments - segments_left; memmove(addrs + 1, addrs, (segments_left - 1) * sizeof(*addrs)); |
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addrs[0] = iph->daddr; 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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{ union { struct ipv6hdr *iph; struct ipv6_opt_hdr *opth; struct ipv6_rt_hdr *rth; char *raw; } exthdr = { .iph = iph }; char *end = exthdr.raw + len; int nexthdr = iph->nexthdr; exthdr.iph++; while (exthdr.raw < end) { switch (nexthdr) { |
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case NEXTHDR_DEST: if (dir == XFRM_POLICY_OUT) 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 ", nexthdr == NEXTHDR_HOP ? "hop" : "dest"); |
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return -EINVAL; } break; case NEXTHDR_ROUTING: ipv6_rearrange_rthdr(iph, exthdr.rth); break; |
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default: |
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return 0; } nexthdr = exthdr.opth->nexthdr; exthdr.raw += ipv6_optlen(exthdr.opth); } return 0; } |
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static void ah6_output_done(struct crypto_async_request *base, int err) { int extlen; u8 *iph_base; u8 *icv; struct sk_buff *skb = base->data; struct xfrm_state *x = skb_dst(skb)->xfrm; struct ah_data *ahp = x->data; struct ipv6hdr *top_iph = ipv6_hdr(skb); struct ip_auth_hdr *ah = ip_auth_hdr(skb); struct tmp_ext *iph_ext; extlen = skb_network_header_len(skb) - sizeof(struct ipv6hdr); if (extlen) extlen += sizeof(*iph_ext); iph_base = AH_SKB_CB(skb)->tmp; iph_ext = ah_tmp_ext(iph_base); icv = ah_tmp_icv(ahp->ahash, iph_ext, extlen); memcpy(ah->auth_data, icv, ahp->icv_trunc_len); memcpy(top_iph, iph_base, IPV6HDR_BASELEN); if (extlen) { |
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#if IS_ENABLED(CONFIG_IPV6_MIP6) |
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memcpy(&top_iph->saddr, iph_ext, extlen); #else memcpy(&top_iph->daddr, iph_ext, extlen); #endif } |
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kfree(AH_SKB_CB(skb)->tmp); xfrm_output_resume(skb, err); } |
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static int ah6_output(struct xfrm_state *x, struct sk_buff *skb) { int err; |
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int nfrags; |
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int extlen; |
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u8 *iph_base; u8 *icv; u8 nexthdr; struct sk_buff *trailer; struct crypto_ahash *ahash; struct ahash_request *req; struct scatterlist *sg; |
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struct ipv6hdr *top_iph; struct ip_auth_hdr *ah; struct ah_data *ahp; |
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struct tmp_ext *iph_ext; |
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int seqhi_len = 0; __be32 *seqhi; int sglists = 0; struct scatterlist *seqhisg; |
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ahp = x->data; ahash = ahp->ahash; |
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err = skb_cow_data(skb, 0, &trailer); if (err < 0) |
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goto out; nfrags = err; |
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|
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skb_push(skb, -skb_network_offset(skb)); |
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extlen = skb_network_header_len(skb) - sizeof(struct ipv6hdr); if (extlen) extlen += sizeof(*iph_ext); |
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if (x->props.flags & XFRM_STATE_ESN) { sglists = 1; seqhi_len = sizeof(*seqhi); } |
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err = -ENOMEM; |
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iph_base = ah_alloc_tmp(ahash, nfrags + sglists, IPV6HDR_BASELEN + extlen + seqhi_len); |
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if (!iph_base) goto out; iph_ext = ah_tmp_ext(iph_base); |
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seqhi = (__be32 *)((char *)iph_ext + extlen); icv = ah_tmp_icv(ahash, seqhi, seqhi_len); |
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req = ah_tmp_req(ahash, icv); sg = ah_req_sg(ahash, req); |
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seqhisg = sg + nfrags; |
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ah = ip_auth_hdr(skb); 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); *skb_mac_header(skb) = IPPROTO_AH; |
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/* When there are no extension headers, we only need to save the first * 8 bytes of the base IP header. */ |
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memcpy(iph_base, top_iph, IPV6HDR_BASELEN); |
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|
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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), 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; top_iph->priority = 0; top_iph->flow_lbl[0] = 0; top_iph->flow_lbl[1] = 0; top_iph->flow_lbl[2] = 0; 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; ah->spi = x->id.spi; |
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ah->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.low); |
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|
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sg_init_table(sg, nfrags + sglists); |
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err = skb_to_sgvec_nomark(skb, sg, 0, skb->len); if (unlikely(err < 0)) goto out_free; |
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|
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if (x->props.flags & XFRM_STATE_ESN) { /* Attach seqhi sg right after packet payload */ *seqhi = htonl(XFRM_SKB_CB(skb)->seq.output.hi); sg_set_buf(seqhisg, seqhi, seqhi_len); } 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); AH_SKB_CB(skb)->tmp = iph_base; |
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|
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err = crypto_ahash_digest(req); if (err) { if (err == -EINPROGRESS) goto out; |
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if (err == -ENOSPC) |
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err = NET_XMIT_DROP; goto out_free; } memcpy(ah->auth_data, icv, ahp->icv_trunc_len); memcpy(top_iph, iph_base, IPV6HDR_BASELEN); 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: kfree(iph_base); out: |
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return err; } |
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static void ah6_input_done(struct crypto_async_request *base, int err) { u8 *auth_data; u8 *icv; u8 *work_iph; struct sk_buff *skb = base->data; struct xfrm_state *x = xfrm_input_state(skb); struct ah_data *ahp = x->data; struct ip_auth_hdr *ah = ip_auth_hdr(skb); int hdr_len = skb_network_header_len(skb); |
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int ah_hlen = ipv6_authlen(ah); |
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|
726282aa6 IPsec: do not ign... |
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if (err) goto out; |
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work_iph = AH_SKB_CB(skb)->tmp; auth_data = ah_tmp_auth(work_iph, hdr_len); 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) goto out; |
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err = ah->nexthdr; |
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skb->network_header += ah_hlen; memcpy(skb_network_header(skb), work_iph, hdr_len); __skb_pull(skb, ah_hlen + hdr_len); |
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if (x->props.mode == XFRM_MODE_TUNNEL) skb_reset_transport_header(skb); else skb_set_transport_header(skb, -hdr_len); |
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out: kfree(AH_SKB_CB(skb)->tmp); xfrm_input_resume(skb, err); } |
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static int ah6_input(struct xfrm_state *x, struct sk_buff *skb) |
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{ /* * Before process AH * [IPv6][Ext1][Ext2][AH][Dest][Payload] * |<-------------->| hdr_len * * To erase AH: * 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 * 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] * There is offset of AH before IPv6 header after the process. */ |
8631e9bdf ah6: convert to a... |
485 486 487 488 489 490 491 |
u8 *auth_data; u8 *icv; u8 *work_iph; struct sk_buff *trailer; struct crypto_ahash *ahash; struct ahash_request *req; struct scatterlist *sg; |
87bdc48d3 [IPSEC]: Get rid ... |
492 |
struct ip_auth_hdr *ah; |
0660e03f6 [SK_BUFF]: Introd... |
493 |
struct ipv6hdr *ip6h; |
1da177e4c Linux-2.6.12-rc2 |
494 |
struct ah_data *ahp; |
1da177e4c Linux-2.6.12-rc2 |
495 496 497 |
u16 hdr_len; u16 ah_hlen; int nexthdr; |
8631e9bdf ah6: convert to a... |
498 499 |
int nfrags; int err = -ENOMEM; |
8d6da6f32 {IPv6,xfrm} Add E... |
500 501 502 503 |
int seqhi_len = 0; __be32 *seqhi; int sglists = 0; struct scatterlist *seqhisg; |
1da177e4c Linux-2.6.12-rc2 |
504 505 506 507 508 509 |
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. */ |
14bbd6a56 net: Add skb_uncl... |
510 |
if (skb_unclone(skb, GFP_ATOMIC)) |
1da177e4c Linux-2.6.12-rc2 |
511 |
goto out; |
7aa68cb90 [IPSEC]: Move ip_... |
512 |
skb->ip_summed = CHECKSUM_NONE; |
8631e9bdf ah6: convert to a... |
513 |
hdr_len = skb_network_header_len(skb); |
87bdc48d3 [IPSEC]: Get rid ... |
514 |
ah = (struct ip_auth_hdr *)skb->data; |
1da177e4c Linux-2.6.12-rc2 |
515 |
ahp = x->data; |
8631e9bdf ah6: convert to a... |
516 |
ahash = ahp->ahash; |
1da177e4c Linux-2.6.12-rc2 |
517 |
nexthdr = ah->nexthdr; |
416e8126a ipv6: Use ipv6_au... |
518 |
ah_hlen = ipv6_authlen(ah); |
1da177e4c Linux-2.6.12-rc2 |
519 |
|
87bdc48d3 [IPSEC]: Get rid ... |
520 521 |
if (ah_hlen != XFRM_ALIGN8(sizeof(*ah) + ahp->icv_full_len) && ah_hlen != XFRM_ALIGN8(sizeof(*ah) + ahp->icv_trunc_len)) |
1ab1457c4 [NET] IPV6: Fix w... |
522 |
goto out; |
1da177e4c Linux-2.6.12-rc2 |
523 524 525 |
if (!pskb_may_pull(skb, ah_hlen)) goto out; |
e5d08d718 ipv6: coding styl... |
526 527 |
err = skb_cow_data(skb, 0, &trailer); if (err < 0) |
8631e9bdf ah6: convert to a... |
528 529 |
goto out; nfrags = err; |
4b0ef1f22 ah: reload pointe... |
530 531 532 533 |
ah = (struct ip_auth_hdr *)skb->data; ip6h = ipv6_hdr(skb); skb_push(skb, hdr_len); |
8d6da6f32 {IPv6,xfrm} Add E... |
534 535 536 537 538 539 540 |
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); |
25105051f ah6: fix error re... |
541 542 |
if (!work_iph) { err = -ENOMEM; |
8631e9bdf ah6: convert to a... |
543 |
goto out; |
25105051f ah6: fix error re... |
544 |
} |
8631e9bdf ah6: convert to a... |
545 |
|
8d6da6f32 {IPv6,xfrm} Add E... |
546 547 548 |
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); |
8631e9bdf ah6: convert to a... |
549 550 |
req = ah_tmp_req(ahash, icv); sg = ah_req_sg(ahash, req); |
8d6da6f32 {IPv6,xfrm} Add E... |
551 |
seqhisg = sg + nfrags; |
8631e9bdf ah6: convert to a... |
552 553 554 555 |
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); |
a5ebcbdf3 ah6: fix error re... |
556 557 |
err = ipv6_clear_mutable_options(ip6h, hdr_len, XFRM_POLICY_IN); if (err) |
8631e9bdf ah6: convert to a... |
558 |
goto out_free; |
0660e03f6 [SK_BUFF]: Introd... |
559 560 561 562 563 |
ip6h->priority = 0; ip6h->flow_lbl[0] = 0; ip6h->flow_lbl[1] = 0; ip6h->flow_lbl[2] = 0; ip6h->hop_limit = 0; |
1da177e4c Linux-2.6.12-rc2 |
564 |
|
8d6da6f32 {IPv6,xfrm} Add E... |
565 |
sg_init_table(sg, nfrags + sglists); |
3f2977072 ipsec: check retu... |
566 567 568 |
err = skb_to_sgvec_nomark(skb, sg, 0, skb->len); if (unlikely(err < 0)) goto out_free; |
8d6da6f32 {IPv6,xfrm} Add E... |
569 570 571 572 573 574 |
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); } |
1da177e4c Linux-2.6.12-rc2 |
575 |
|
8d6da6f32 {IPv6,xfrm} Add E... |
576 |
ahash_request_set_crypt(req, sg, icv, skb->len + seqhi_len); |
8631e9bdf ah6: convert to a... |
577 578 579 580 581 582 583 584 |
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; |
8631e9bdf ah6: convert to a... |
585 |
goto out_free; |
1da177e4c Linux-2.6.12-rc2 |
586 |
} |
0ebea8ef3 [IPSEC]: Move sta... |
587 |
|
67df58a3e ah: use crypto_me... |
588 |
err = crypto_memneq(icv, auth_data, ahp->icv_trunc_len) ? -EBADMSG : 0; |
0ebea8ef3 [IPSEC]: Move sta... |
589 |
if (err) |
8631e9bdf ah6: convert to a... |
590 |
goto out_free; |
1da177e4c Linux-2.6.12-rc2 |
591 |
|
b0e380b1d [SK_BUFF]: unions... |
592 |
skb->network_header += ah_hlen; |
8631e9bdf ah6: convert to a... |
593 |
memcpy(skb_network_header(skb), work_iph, hdr_len); |
31a4ab930 [IPSEC] proto: Mo... |
594 |
__skb_pull(skb, ah_hlen + hdr_len); |
1da177e4c Linux-2.6.12-rc2 |
595 |
|
a9403f8ae ah6/esp6: set tra... |
596 597 598 599 |
if (x->props.mode == XFRM_MODE_TUNNEL) skb_reset_transport_header(skb); else skb_set_transport_header(skb, -hdr_len); |
8631e9bdf ah6: convert to a... |
600 |
err = nexthdr; |
1da177e4c Linux-2.6.12-rc2 |
601 |
|
8631e9bdf ah6: convert to a... |
602 603 |
out_free: kfree(work_iph); |
1da177e4c Linux-2.6.12-rc2 |
604 |
out: |
07d4ee583 [IPSEC]: Use HMAC... |
605 |
return err; |
1da177e4c Linux-2.6.12-rc2 |
606 |
} |
e924d2d68 ah6: Use the IPse... |
607 608 |
static int ah6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, u8 type, u8 code, int offset, __be32 info) |
1da177e4c Linux-2.6.12-rc2 |
609 |
{ |
4fb236bac netns xfrm: AH/ES... |
610 |
struct net *net = dev_net(skb->dev); |
67ba4152e ipv6: White-space... |
611 612 |
struct ipv6hdr *iph = (struct ipv6hdr *)skb->data; struct ip_auth_hdr *ah = (struct ip_auth_hdr *)(skb->data+offset); |
1da177e4c Linux-2.6.12-rc2 |
613 |
struct xfrm_state *x; |
b3b2b9e19 ipsec: Don't upda... |
614 |
if (type != ICMPV6_PKT_TOOBIG && |
ec18d9a26 ipv6: Add redirec... |
615 |
type != NDISC_REDIRECT) |
e924d2d68 ah6: Use the IPse... |
616 |
return 0; |
1da177e4c Linux-2.6.12-rc2 |
617 |
|
bd55775c8 xfrm: SA lookups ... |
618 |
x = xfrm_state_lookup(net, skb->mark, (xfrm_address_t *)&iph->daddr, ah->spi, IPPROTO_AH, AF_INET6); |
1da177e4c Linux-2.6.12-rc2 |
619 |
if (!x) |
e924d2d68 ah6: Use the IPse... |
620 |
return 0; |
1da177e4c Linux-2.6.12-rc2 |
621 |
|
ec18d9a26 ipv6: Add redirec... |
622 |
if (type == NDISC_REDIRECT) |
e2d118a1c net: inet: Suppor... |
623 624 |
ip6_redirect(skb, net, skb->dev->ifindex, 0, sock_net_uid(net, NULL)); |
ec18d9a26 ipv6: Add redirec... |
625 |
else |
e2d118a1c net: inet: Suppor... |
626 |
ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL)); |
1da177e4c Linux-2.6.12-rc2 |
627 |
xfrm_state_put(x); |
e924d2d68 ah6: Use the IPse... |
628 629 |
return 0; |
1da177e4c Linux-2.6.12-rc2 |
630 |
} |
72cb6962a [IPSEC]: Add xfrm... |
631 |
static int ah6_init_state(struct xfrm_state *x) |
1da177e4c Linux-2.6.12-rc2 |
632 633 634 |
{ struct ah_data *ahp = NULL; struct xfrm_algo_desc *aalg_desc; |
8631e9bdf ah6: convert to a... |
635 |
struct crypto_ahash *ahash; |
1da177e4c Linux-2.6.12-rc2 |
636 637 638 |
if (!x->aalg) goto error; |
1da177e4c Linux-2.6.12-rc2 |
639 640 |
if (x->encap) goto error; |
0c600eda4 [IPV6]: Nearly co... |
641 |
ahp = kzalloc(sizeof(*ahp), GFP_KERNEL); |
63159f29b ipv6: coding styl... |
642 |
if (!ahp) |
1da177e4c Linux-2.6.12-rc2 |
643 |
return -ENOMEM; |
8631e9bdf ah6: convert to a... |
644 645 |
ahash = crypto_alloc_ahash(x->aalg->alg_name, 0, 0); if (IS_ERR(ahash)) |
07d4ee583 [IPSEC]: Use HMAC... |
646 |
goto error; |
8631e9bdf ah6: convert to a... |
647 648 |
ahp->ahash = ahash; if (crypto_ahash_setkey(ahash, x->aalg->alg_key, |
bc31d3b2c [IPSEC] ah: Remov... |
649 |
(x->aalg->alg_key_len + 7) / 8)) |
1da177e4c Linux-2.6.12-rc2 |
650 |
goto error; |
1ab1457c4 [NET] IPV6: Fix w... |
651 |
|
1da177e4c Linux-2.6.12-rc2 |
652 653 654 655 |
/* * 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 |
07d4ee583 [IPSEC]: Use HMAC... |
656 |
* after a successful crypto_alloc_hash(). |
1da177e4c Linux-2.6.12-rc2 |
657 658 659 660 661 |
*/ aalg_desc = xfrm_aalg_get_byname(x->aalg->alg_name, 0); BUG_ON(!aalg_desc); if (aalg_desc->uinfo.auth.icv_fullbits/8 != |
8631e9bdf ah6: convert to a... |
662 |
crypto_ahash_digestsize(ahash)) { |
f32138319 net: ipv6: Standa... |
663 664 665 666 |
pr_info("AH: %s digestsize %u != %hu ", x->aalg->alg_name, crypto_ahash_digestsize(ahash), aalg_desc->uinfo.auth.icv_fullbits/8); |
1da177e4c Linux-2.6.12-rc2 |
667 668 |
goto error; } |
1ab1457c4 [NET] IPV6: Fix w... |
669 |
|
1da177e4c Linux-2.6.12-rc2 |
670 |
ahp->icv_full_len = aalg_desc->uinfo.auth.icv_fullbits/8; |
8f8a088c2 xfrm: Use the use... |
671 |
ahp->icv_trunc_len = x->aalg->alg_trunc_len/8; |
1ab1457c4 [NET] IPV6: Fix w... |
672 |
|
87bdc48d3 [IPSEC]: Get rid ... |
673 674 |
x->props.header_len = XFRM_ALIGN8(sizeof(struct ip_auth_hdr) + ahp->icv_trunc_len); |
ca68145f1 [IPSEC]: Disallow... |
675 676 677 678 679 |
switch (x->props.mode) { case XFRM_MODE_BEET: case XFRM_MODE_TRANSPORT: break; case XFRM_MODE_TUNNEL: |
1da177e4c Linux-2.6.12-rc2 |
680 |
x->props.header_len += sizeof(struct ipv6hdr); |
ea2c47b42 [IPSEC] IPV6: Fix... |
681 |
break; |
ca68145f1 [IPSEC]: Disallow... |
682 683 684 |
default: goto error; } |
1da177e4c Linux-2.6.12-rc2 |
685 686 687 688 689 690 |
x->data = ahp; return 0; error: if (ahp) { |
8631e9bdf ah6: convert to a... |
691 |
crypto_free_ahash(ahp->ahash); |
1da177e4c Linux-2.6.12-rc2 |
692 693 694 695 696 697 698 699 700 701 702 |
kfree(ahp); } return -EINVAL; } static void ah6_destroy(struct xfrm_state *x) { struct ah_data *ahp = x->data; if (!ahp) return; |
8631e9bdf ah6: convert to a... |
703 |
crypto_free_ahash(ahp->ahash); |
1da177e4c Linux-2.6.12-rc2 |
704 705 |
kfree(ahp); } |
e924d2d68 ah6: Use the IPse... |
706 707 708 709 |
static int ah6_rcv_cb(struct sk_buff *skb, int err) { return 0; } |
cc24becae ipv6: White-space... |
710 |
static const struct xfrm_type ah6_type = { |
1da177e4c Linux-2.6.12-rc2 |
711 712 |
.description = "AH6", .owner = THIS_MODULE, |
cc24becae ipv6: White-space... |
713 |
.proto = IPPROTO_AH, |
436a0a402 [IPSEC]: Move out... |
714 |
.flags = XFRM_TYPE_REPLAY_PROT, |
1da177e4c Linux-2.6.12-rc2 |
715 716 717 |
.init_state = ah6_init_state, .destructor = ah6_destroy, .input = ah6_input, |
aee5adb43 [XFRM] STATE: Add... |
718 719 |
.output = ah6_output, .hdr_offset = xfrm6_find_1stfragopt, |
1da177e4c Linux-2.6.12-rc2 |
720 |
}; |
e924d2d68 ah6: Use the IPse... |
721 |
static struct xfrm6_protocol ah6_protocol = { |
1da177e4c Linux-2.6.12-rc2 |
722 |
.handler = xfrm6_rcv, |
0146dca70 xfrm: add support... |
723 |
.input_handler = xfrm_input, |
e924d2d68 ah6: Use the IPse... |
724 |
.cb_handler = ah6_rcv_cb, |
1da177e4c Linux-2.6.12-rc2 |
725 |
.err_handler = ah6_err, |
e924d2d68 ah6: Use the IPse... |
726 |
.priority = 0, |
1da177e4c Linux-2.6.12-rc2 |
727 728 729 730 731 |
}; static int __init ah6_init(void) { if (xfrm_register_type(&ah6_type, AF_INET6) < 0) { |
f32138319 net: ipv6: Standa... |
732 733 |
pr_info("%s: can't add xfrm type ", __func__); |
1da177e4c Linux-2.6.12-rc2 |
734 735 |
return -EAGAIN; } |
e924d2d68 ah6: Use the IPse... |
736 |
if (xfrm6_protocol_register(&ah6_protocol, IPPROTO_AH) < 0) { |
f32138319 net: ipv6: Standa... |
737 738 |
pr_info("%s: can't add protocol ", __func__); |
1da177e4c Linux-2.6.12-rc2 |
739 740 741 742 743 744 745 746 747 |
xfrm_unregister_type(&ah6_type, AF_INET6); return -EAGAIN; } return 0; } static void __exit ah6_fini(void) { |
e924d2d68 ah6: Use the IPse... |
748 |
if (xfrm6_protocol_deregister(&ah6_protocol, IPPROTO_AH) < 0) |
f32138319 net: ipv6: Standa... |
749 750 |
pr_info("%s: can't remove protocol ", __func__); |
1da177e4c Linux-2.6.12-rc2 |
751 |
|
4f518e802 xfrm: remove type... |
752 |
xfrm_unregister_type(&ah6_type, AF_INET6); |
1da177e4c Linux-2.6.12-rc2 |
753 754 755 756 757 758 |
} module_init(ah6_init); module_exit(ah6_fini); MODULE_LICENSE("GPL"); |
d3d6dd3ad [XFRM]: Add modul... |
759 |
MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_AH); |