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net/ipv6/ah6.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 * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (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, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * 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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* * 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; char hdrs[0]; }; 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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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; if (err == -EBUSY) 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); int ah_hlen = (ah->hdrlen + 2) << 2; |
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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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492 |
* |
1da177e4c Linux-2.6.12-rc2 |
493 494 495 |
* |<>|[IPv6][Ext1][Ext2][Dest][Payload] * There is offset of AH before IPv6 header after the process. */ |
8631e9bdf ah6: convert to a... |
496 497 498 499 500 501 502 |
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 ... |
503 |
struct ip_auth_hdr *ah; |
0660e03f6 [SK_BUFF]: Introd... |
504 |
struct ipv6hdr *ip6h; |
1da177e4c Linux-2.6.12-rc2 |
505 |
struct ah_data *ahp; |
1da177e4c Linux-2.6.12-rc2 |
506 507 508 |
u16 hdr_len; u16 ah_hlen; int nexthdr; |
8631e9bdf ah6: convert to a... |
509 510 |
int nfrags; int err = -ENOMEM; |
8d6da6f32 {IPv6,xfrm} Add E... |
511 512 513 514 |
int seqhi_len = 0; __be32 *seqhi; int sglists = 0; struct scatterlist *seqhisg; |
1da177e4c Linux-2.6.12-rc2 |
515 516 517 518 519 520 |
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... |
521 |
if (skb_unclone(skb, GFP_ATOMIC)) |
1da177e4c Linux-2.6.12-rc2 |
522 |
goto out; |
7aa68cb90 [IPSEC]: Move ip_... |
523 |
skb->ip_summed = CHECKSUM_NONE; |
8631e9bdf ah6: convert to a... |
524 |
hdr_len = skb_network_header_len(skb); |
87bdc48d3 [IPSEC]: Get rid ... |
525 |
ah = (struct ip_auth_hdr *)skb->data; |
1da177e4c Linux-2.6.12-rc2 |
526 |
ahp = x->data; |
8631e9bdf ah6: convert to a... |
527 |
ahash = ahp->ahash; |
1da177e4c Linux-2.6.12-rc2 |
528 529 |
nexthdr = ah->nexthdr; ah_hlen = (ah->hdrlen + 2) << 2; |
87bdc48d3 [IPSEC]: Get rid ... |
530 531 |
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... |
532 |
goto out; |
1da177e4c Linux-2.6.12-rc2 |
533 534 535 |
if (!pskb_may_pull(skb, ah_hlen)) goto out; |
e5d08d718 ipv6: coding styl... |
536 537 |
err = skb_cow_data(skb, 0, &trailer); if (err < 0) |
8631e9bdf ah6: convert to a... |
538 539 |
goto out; nfrags = err; |
4b0ef1f22 ah: reload pointe... |
540 541 542 543 |
ah = (struct ip_auth_hdr *)skb->data; ip6h = ipv6_hdr(skb); skb_push(skb, hdr_len); |
8d6da6f32 {IPv6,xfrm} Add E... |
544 545 546 547 548 549 550 |
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... |
551 552 |
if (!work_iph) { err = -ENOMEM; |
8631e9bdf ah6: convert to a... |
553 |
goto out; |
25105051f ah6: fix error re... |
554 |
} |
8631e9bdf ah6: convert to a... |
555 |
|
8d6da6f32 {IPv6,xfrm} Add E... |
556 557 558 |
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... |
559 560 |
req = ah_tmp_req(ahash, icv); sg = ah_req_sg(ahash, req); |
8d6da6f32 {IPv6,xfrm} Add E... |
561 |
seqhisg = sg + nfrags; |
8631e9bdf ah6: convert to a... |
562 563 564 565 |
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); |
0660e03f6 [SK_BUFF]: Introd... |
566 |
if (ipv6_clear_mutable_options(ip6h, hdr_len, XFRM_POLICY_IN)) |
8631e9bdf ah6: convert to a... |
567 |
goto out_free; |
0660e03f6 [SK_BUFF]: Introd... |
568 569 570 571 572 |
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 |
573 |
|
8d6da6f32 {IPv6,xfrm} Add E... |
574 |
sg_init_table(sg, nfrags + sglists); |
3f2977072 ipsec: check retu... |
575 576 577 |
err = skb_to_sgvec_nomark(skb, sg, 0, skb->len); if (unlikely(err < 0)) goto out_free; |
8d6da6f32 {IPv6,xfrm} Add E... |
578 579 580 581 582 583 |
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 |
584 |
|
8d6da6f32 {IPv6,xfrm} Add E... |
585 |
ahash_request_set_crypt(req, sg, icv, skb->len + seqhi_len); |
8631e9bdf ah6: convert to a... |
586 587 588 589 590 591 592 593 |
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... |
594 |
goto out_free; |
1da177e4c Linux-2.6.12-rc2 |
595 |
} |
0ebea8ef3 [IPSEC]: Move sta... |
596 |
|
67df58a3e ah: use crypto_me... |
597 |
err = crypto_memneq(icv, auth_data, ahp->icv_trunc_len) ? -EBADMSG : 0; |
0ebea8ef3 [IPSEC]: Move sta... |
598 |
if (err) |
8631e9bdf ah6: convert to a... |
599 |
goto out_free; |
1da177e4c Linux-2.6.12-rc2 |
600 |
|
b0e380b1d [SK_BUFF]: unions... |
601 |
skb->network_header += ah_hlen; |
8631e9bdf ah6: convert to a... |
602 |
memcpy(skb_network_header(skb), work_iph, hdr_len); |
31a4ab930 [IPSEC] proto: Mo... |
603 |
__skb_pull(skb, ah_hlen + hdr_len); |
1da177e4c Linux-2.6.12-rc2 |
604 |
|
a9403f8ae ah6/esp6: set tra... |
605 606 607 608 |
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... |
609 |
err = nexthdr; |
1da177e4c Linux-2.6.12-rc2 |
610 |
|
8631e9bdf ah6: convert to a... |
611 612 |
out_free: kfree(work_iph); |
1da177e4c Linux-2.6.12-rc2 |
613 |
out: |
07d4ee583 [IPSEC]: Use HMAC... |
614 |
return err; |
1da177e4c Linux-2.6.12-rc2 |
615 |
} |
e924d2d68 ah6: Use the IPse... |
616 617 |
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 |
618 |
{ |
4fb236bac netns xfrm: AH/ES... |
619 |
struct net *net = dev_net(skb->dev); |
67ba4152e ipv6: White-space... |
620 621 |
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 |
622 |
struct xfrm_state *x; |
b3b2b9e19 ipsec: Don't upda... |
623 |
if (type != ICMPV6_PKT_TOOBIG && |
ec18d9a26 ipv6: Add redirec... |
624 |
type != NDISC_REDIRECT) |
e924d2d68 ah6: Use the IPse... |
625 |
return 0; |
1da177e4c Linux-2.6.12-rc2 |
626 |
|
bd55775c8 xfrm: SA lookups ... |
627 |
x = xfrm_state_lookup(net, skb->mark, (xfrm_address_t *)&iph->daddr, ah->spi, IPPROTO_AH, AF_INET6); |
1da177e4c Linux-2.6.12-rc2 |
628 |
if (!x) |
e924d2d68 ah6: Use the IPse... |
629 |
return 0; |
1da177e4c Linux-2.6.12-rc2 |
630 |
|
ec18d9a26 ipv6: Add redirec... |
631 |
if (type == NDISC_REDIRECT) |
e2d118a1c net: inet: Suppor... |
632 633 |
ip6_redirect(skb, net, skb->dev->ifindex, 0, sock_net_uid(net, NULL)); |
ec18d9a26 ipv6: Add redirec... |
634 |
else |
e2d118a1c net: inet: Suppor... |
635 |
ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL)); |
1da177e4c Linux-2.6.12-rc2 |
636 |
xfrm_state_put(x); |
e924d2d68 ah6: Use the IPse... |
637 638 |
return 0; |
1da177e4c Linux-2.6.12-rc2 |
639 |
} |
72cb6962a [IPSEC]: Add xfrm... |
640 |
static int ah6_init_state(struct xfrm_state *x) |
1da177e4c Linux-2.6.12-rc2 |
641 642 643 |
{ struct ah_data *ahp = NULL; struct xfrm_algo_desc *aalg_desc; |
8631e9bdf ah6: convert to a... |
644 |
struct crypto_ahash *ahash; |
1da177e4c Linux-2.6.12-rc2 |
645 646 647 |
if (!x->aalg) goto error; |
1da177e4c Linux-2.6.12-rc2 |
648 649 |
if (x->encap) goto error; |
0c600eda4 [IPV6]: Nearly co... |
650 |
ahp = kzalloc(sizeof(*ahp), GFP_KERNEL); |
63159f29b ipv6: coding styl... |
651 |
if (!ahp) |
1da177e4c Linux-2.6.12-rc2 |
652 |
return -ENOMEM; |
8631e9bdf ah6: convert to a... |
653 654 |
ahash = crypto_alloc_ahash(x->aalg->alg_name, 0, 0); if (IS_ERR(ahash)) |
07d4ee583 [IPSEC]: Use HMAC... |
655 |
goto error; |
8631e9bdf ah6: convert to a... |
656 657 |
ahp->ahash = ahash; if (crypto_ahash_setkey(ahash, x->aalg->alg_key, |
bc31d3b2c [IPSEC] ah: Remov... |
658 |
(x->aalg->alg_key_len + 7) / 8)) |
1da177e4c Linux-2.6.12-rc2 |
659 |
goto error; |
1ab1457c4 [NET] IPV6: Fix w... |
660 |
|
1da177e4c Linux-2.6.12-rc2 |
661 662 663 664 |
/* * 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... |
665 |
* after a successful crypto_alloc_hash(). |
1da177e4c Linux-2.6.12-rc2 |
666 667 668 669 670 |
*/ 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... |
671 |
crypto_ahash_digestsize(ahash)) { |
f32138319 net: ipv6: Standa... |
672 673 674 675 |
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 |
676 677 |
goto error; } |
1ab1457c4 [NET] IPV6: Fix w... |
678 |
|
1da177e4c Linux-2.6.12-rc2 |
679 |
ahp->icv_full_len = aalg_desc->uinfo.auth.icv_fullbits/8; |
8f8a088c2 xfrm: Use the use... |
680 |
ahp->icv_trunc_len = x->aalg->alg_trunc_len/8; |
1ab1457c4 [NET] IPV6: Fix w... |
681 |
|
87bdc48d3 [IPSEC]: Get rid ... |
682 683 |
x->props.header_len = XFRM_ALIGN8(sizeof(struct ip_auth_hdr) + ahp->icv_trunc_len); |
ca68145f1 [IPSEC]: Disallow... |
684 685 686 687 688 |
switch (x->props.mode) { case XFRM_MODE_BEET: case XFRM_MODE_TRANSPORT: break; case XFRM_MODE_TUNNEL: |
1da177e4c Linux-2.6.12-rc2 |
689 |
x->props.header_len += sizeof(struct ipv6hdr); |
ea2c47b42 [IPSEC] IPV6: Fix... |
690 |
break; |
ca68145f1 [IPSEC]: Disallow... |
691 692 693 |
default: goto error; } |
1da177e4c Linux-2.6.12-rc2 |
694 695 696 697 698 699 |
x->data = ahp; return 0; error: if (ahp) { |
8631e9bdf ah6: convert to a... |
700 |
crypto_free_ahash(ahp->ahash); |
1da177e4c Linux-2.6.12-rc2 |
701 702 703 704 705 706 707 708 709 710 711 |
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... |
712 |
crypto_free_ahash(ahp->ahash); |
1da177e4c Linux-2.6.12-rc2 |
713 714 |
kfree(ahp); } |
e924d2d68 ah6: Use the IPse... |
715 716 717 718 |
static int ah6_rcv_cb(struct sk_buff *skb, int err) { return 0; } |
cc24becae ipv6: White-space... |
719 |
static const struct xfrm_type ah6_type = { |
1da177e4c Linux-2.6.12-rc2 |
720 721 |
.description = "AH6", .owner = THIS_MODULE, |
cc24becae ipv6: White-space... |
722 |
.proto = IPPROTO_AH, |
436a0a402 [IPSEC]: Move out... |
723 |
.flags = XFRM_TYPE_REPLAY_PROT, |
1da177e4c Linux-2.6.12-rc2 |
724 725 726 |
.init_state = ah6_init_state, .destructor = ah6_destroy, .input = ah6_input, |
aee5adb43 [XFRM] STATE: Add... |
727 728 |
.output = ah6_output, .hdr_offset = xfrm6_find_1stfragopt, |
1da177e4c Linux-2.6.12-rc2 |
729 |
}; |
e924d2d68 ah6: Use the IPse... |
730 |
static struct xfrm6_protocol ah6_protocol = { |
1da177e4c Linux-2.6.12-rc2 |
731 |
.handler = xfrm6_rcv, |
e924d2d68 ah6: Use the IPse... |
732 |
.cb_handler = ah6_rcv_cb, |
1da177e4c Linux-2.6.12-rc2 |
733 |
.err_handler = ah6_err, |
e924d2d68 ah6: Use the IPse... |
734 |
.priority = 0, |
1da177e4c Linux-2.6.12-rc2 |
735 736 737 738 739 |
}; static int __init ah6_init(void) { if (xfrm_register_type(&ah6_type, AF_INET6) < 0) { |
f32138319 net: ipv6: Standa... |
740 741 |
pr_info("%s: can't add xfrm type ", __func__); |
1da177e4c Linux-2.6.12-rc2 |
742 743 |
return -EAGAIN; } |
e924d2d68 ah6: Use the IPse... |
744 |
if (xfrm6_protocol_register(&ah6_protocol, IPPROTO_AH) < 0) { |
f32138319 net: ipv6: Standa... |
745 746 |
pr_info("%s: can't add protocol ", __func__); |
1da177e4c Linux-2.6.12-rc2 |
747 748 749 750 751 752 753 754 755 |
xfrm_unregister_type(&ah6_type, AF_INET6); return -EAGAIN; } return 0; } static void __exit ah6_fini(void) { |
e924d2d68 ah6: Use the IPse... |
756 |
if (xfrm6_protocol_deregister(&ah6_protocol, IPPROTO_AH) < 0) |
f32138319 net: ipv6: Standa... |
757 758 |
pr_info("%s: can't remove protocol ", __func__); |
1da177e4c Linux-2.6.12-rc2 |
759 760 |
if (xfrm_unregister_type(&ah6_type, AF_INET6) < 0) |
f32138319 net: ipv6: Standa... |
761 762 |
pr_info("%s: can't remove xfrm type ", __func__); |
1da177e4c Linux-2.6.12-rc2 |
763 764 765 766 767 768 769 |
} module_init(ah6_init); module_exit(ah6_fini); MODULE_LICENSE("GPL"); |
d3d6dd3ad [XFRM]: Add modul... |
770 |
MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_AH); |