| /* |
| * Copyright (C)2002 USAGI/WIDE Project |
| * |
| * 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. |
| * |
| * 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. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| * |
| * Authors |
| * |
| * Mitsuru KANDA @USAGI : IPv6 Support |
| * Kazunori MIYAZAWA @USAGI : |
| * Kunihiro Ishiguro <kunihiro@ipinfusion.com> |
| * |
| * This file is derived from net/ipv4/ah.c. |
| */ |
| |
| #define pr_fmt(fmt) "IPv6: " fmt |
| |
| #include <crypto/hash.h> |
| #include <linux/module.h> |
| #include <linux/slab.h> |
| #include <net/ip.h> |
| #include <net/ah.h> |
| #include <linux/crypto.h> |
| #include <linux/pfkeyv2.h> |
| #include <linux/string.h> |
| #include <linux/scatterlist.h> |
| #include <net/ip6_route.h> |
| #include <net/icmp.h> |
| #include <net/ipv6.h> |
| #include <net/protocol.h> |
| #include <net/xfrm.h> |
| |
| #define IPV6HDR_BASELEN 8 |
| |
| struct tmp_ext { |
| #if IS_ENABLED(CONFIG_IPV6_MIP6) |
| 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)); |
| } |
| |
| static bool zero_out_mutable_opts(struct ipv6_opt_hdr *opthdr) |
| { |
| 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]) { |
| |
| case IPV6_TLV_PAD1: |
| optlen = 1; |
| break; |
| default: |
| if (len < 2) |
| 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) |
| return true; |
| |
| bad: |
| return false; |
| } |
| |
| #if IS_ENABLED(CONFIG_IPV6_MIP6) |
| /** |
| * 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]) { |
| |
| case IPV6_TLV_PAD1: |
| 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)) { |
| net_warn_ratelimited("destopt hao: invalid header length: %u\n", |
| hao->length); |
| goto bad; |
| } |
| final_addr = hao->addr; |
| hao->addr = iph->saddr; |
| iph->saddr = final_addr; |
| } |
| break; |
| } |
| |
| off += optlen; |
| len -= optlen; |
| } |
| /* Note: ok if len == 0 */ |
| bad: |
| return; |
| } |
| #else |
| static void ipv6_rearrange_destopt(struct ipv6hdr *iph, struct ipv6_opt_hdr *destopt) {} |
| #endif |
| |
| /** |
| * 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; |
| rthdr->segments_left = 0; |
| |
| /* 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; |
| final_addr = addrs[segments - 1]; |
| |
| addrs += segments - segments_left; |
| memmove(addrs + 1, addrs, (segments_left - 1) * sizeof(*addrs)); |
| |
| addrs[0] = iph->daddr; |
| iph->daddr = final_addr; |
| } |
| |
| static int ipv6_clear_mutable_options(struct ipv6hdr *iph, int len, int dir) |
| { |
| 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) { |
| case NEXTHDR_DEST: |
| if (dir == XFRM_POLICY_OUT) |
| ipv6_rearrange_destopt(iph, exthdr.opth); |
| case NEXTHDR_HOP: |
| if (!zero_out_mutable_opts(exthdr.opth)) { |
| LIMIT_NETDEBUG( |
| KERN_WARNING "overrun %sopts\n", |
| nexthdr == NEXTHDR_HOP ? |
| "hop" : "dest"); |
| return -EINVAL; |
| } |
| break; |
| |
| case NEXTHDR_ROUTING: |
| ipv6_rearrange_rthdr(iph, exthdr.rth); |
| break; |
| |
| default : |
| return 0; |
| } |
| |
| nexthdr = exthdr.opth->nexthdr; |
| exthdr.raw += ipv6_optlen(exthdr.opth); |
| } |
| |
| return 0; |
| } |
| |
| 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) { |
| #if IS_ENABLED(CONFIG_IPV6_MIP6) |
| memcpy(&top_iph->saddr, iph_ext, extlen); |
| #else |
| memcpy(&top_iph->daddr, iph_ext, extlen); |
| #endif |
| } |
| |
| kfree(AH_SKB_CB(skb)->tmp); |
| xfrm_output_resume(skb, err); |
| } |
| |
| static int ah6_output(struct xfrm_state *x, struct sk_buff *skb) |
| { |
| int err; |
| int nfrags; |
| int extlen; |
| u8 *iph_base; |
| u8 *icv; |
| u8 nexthdr; |
| struct sk_buff *trailer; |
| struct crypto_ahash *ahash; |
| struct ahash_request *req; |
| struct scatterlist *sg; |
| struct ipv6hdr *top_iph; |
| struct ip_auth_hdr *ah; |
| struct ah_data *ahp; |
| struct tmp_ext *iph_ext; |
| |
| ahp = x->data; |
| ahash = ahp->ahash; |
| |
| if ((err = skb_cow_data(skb, 0, &trailer)) < 0) |
| goto out; |
| nfrags = err; |
| |
| skb_push(skb, -skb_network_offset(skb)); |
| extlen = skb_network_header_len(skb) - sizeof(struct ipv6hdr); |
| if (extlen) |
| extlen += sizeof(*iph_ext); |
| |
| err = -ENOMEM; |
| iph_base = ah_alloc_tmp(ahash, nfrags, IPV6HDR_BASELEN + extlen); |
| if (!iph_base) |
| goto out; |
| |
| iph_ext = ah_tmp_ext(iph_base); |
| icv = ah_tmp_icv(ahash, iph_ext, extlen); |
| req = ah_tmp_req(ahash, icv); |
| sg = ah_req_sg(ahash, req); |
| |
| ah = ip_auth_hdr(skb); |
| memset(ah->auth_data, 0, ahp->icv_trunc_len); |
| |
| top_iph = ipv6_hdr(skb); |
| top_iph->payload_len = htons(skb->len - sizeof(*top_iph)); |
| |
| nexthdr = *skb_mac_header(skb); |
| *skb_mac_header(skb) = IPPROTO_AH; |
| |
| /* When there are no extension headers, we only need to save the first |
| * 8 bytes of the base IP header. |
| */ |
| memcpy(iph_base, top_iph, IPV6HDR_BASELEN); |
| |
| if (extlen) { |
| #if IS_ENABLED(CONFIG_IPV6_MIP6) |
| memcpy(iph_ext, &top_iph->saddr, extlen); |
| #else |
| memcpy(iph_ext, &top_iph->daddr, extlen); |
| #endif |
| err = ipv6_clear_mutable_options(top_iph, |
| extlen - sizeof(*iph_ext) + |
| sizeof(*top_iph), |
| XFRM_POLICY_OUT); |
| if (err) |
| goto out_free; |
| } |
| |
| 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; |
| |
| ah->hdrlen = (XFRM_ALIGN8(sizeof(*ah) + ahp->icv_trunc_len) >> 2) - 2; |
| |
| ah->reserved = 0; |
| ah->spi = x->id.spi; |
| ah->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.low); |
| |
| sg_init_table(sg, nfrags); |
| skb_to_sgvec(skb, sg, 0, skb->len); |
| |
| ahash_request_set_crypt(req, sg, icv, skb->len); |
| ahash_request_set_callback(req, 0, ah6_output_done, skb); |
| |
| AH_SKB_CB(skb)->tmp = iph_base; |
| |
| 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) { |
| #if IS_ENABLED(CONFIG_IPV6_MIP6) |
| memcpy(&top_iph->saddr, iph_ext, extlen); |
| #else |
| memcpy(&top_iph->daddr, iph_ext, extlen); |
| #endif |
| } |
| |
| out_free: |
| kfree(iph_base); |
| out: |
| return err; |
| } |
| |
| 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; |
| |
| 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); |
| |
| err = memcmp(icv, auth_data, ahp->icv_trunc_len) ? -EBADMSG: 0; |
| if (err) |
| goto out; |
| |
| err = ah->nexthdr; |
| |
| 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); |
| out: |
| kfree(AH_SKB_CB(skb)->tmp); |
| xfrm_input_resume(skb, err); |
| } |
| |
| |
| |
| static int ah6_input(struct xfrm_state *x, struct sk_buff *skb) |
| { |
| /* |
| * Before process AH |
| * [IPv6][Ext1][Ext2][AH][Dest][Payload] |
| * |<-------------->| hdr_len |
| * |
| * To erase AH: |
| * Keeping copy of cleared headers. After AH processing, |
| * Moving the pointer of skb->network_header by using skb_pull as long |
| * as AH header length. Then copy back the copy as long as hdr_len |
| * If destination header following AH exists, copy it into after [Ext2]. |
| * |
| * |<>|[IPv6][Ext1][Ext2][Dest][Payload] |
| * There is offset of AH before IPv6 header after the process. |
| */ |
| |
| u8 *auth_data; |
| u8 *icv; |
| u8 *work_iph; |
| struct sk_buff *trailer; |
| struct crypto_ahash *ahash; |
| struct ahash_request *req; |
| struct scatterlist *sg; |
| struct ip_auth_hdr *ah; |
| struct ipv6hdr *ip6h; |
| struct ah_data *ahp; |
| u16 hdr_len; |
| u16 ah_hlen; |
| int nexthdr; |
| int nfrags; |
| int err = -ENOMEM; |
| |
| if (!pskb_may_pull(skb, sizeof(struct ip_auth_hdr))) |
| goto out; |
| |
| /* We are going to _remove_ AH header to keep sockets happy, |
| * so... Later this can change. */ |
| if (skb_cloned(skb) && |
| pskb_expand_head(skb, 0, 0, GFP_ATOMIC)) |
| goto out; |
| |
| skb->ip_summed = CHECKSUM_NONE; |
| |
| hdr_len = skb_network_header_len(skb); |
| ah = (struct ip_auth_hdr *)skb->data; |
| ahp = x->data; |
| ahash = ahp->ahash; |
| |
| nexthdr = ah->nexthdr; |
| ah_hlen = (ah->hdrlen + 2) << 2; |
| |
| if (ah_hlen != XFRM_ALIGN8(sizeof(*ah) + ahp->icv_full_len) && |
| ah_hlen != XFRM_ALIGN8(sizeof(*ah) + ahp->icv_trunc_len)) |
| goto out; |
| |
| if (!pskb_may_pull(skb, ah_hlen)) |
| goto out; |
| |
| |
| if ((err = skb_cow_data(skb, 0, &trailer)) < 0) |
| goto out; |
| nfrags = err; |
| |
| ah = (struct ip_auth_hdr *)skb->data; |
| ip6h = ipv6_hdr(skb); |
| |
| skb_push(skb, hdr_len); |
| |
| work_iph = ah_alloc_tmp(ahash, nfrags, hdr_len + ahp->icv_trunc_len); |
| if (!work_iph) |
| goto out; |
| |
| auth_data = ah_tmp_auth(work_iph, hdr_len); |
| icv = ah_tmp_icv(ahash, auth_data, ahp->icv_trunc_len); |
| req = ah_tmp_req(ahash, icv); |
| sg = ah_req_sg(ahash, req); |
| |
| memcpy(work_iph, ip6h, hdr_len); |
| memcpy(auth_data, ah->auth_data, ahp->icv_trunc_len); |
| memset(ah->auth_data, 0, ahp->icv_trunc_len); |
| |
| if (ipv6_clear_mutable_options(ip6h, hdr_len, XFRM_POLICY_IN)) |
| goto out_free; |
| |
| ip6h->priority = 0; |
| ip6h->flow_lbl[0] = 0; |
| ip6h->flow_lbl[1] = 0; |
| ip6h->flow_lbl[2] = 0; |
| ip6h->hop_limit = 0; |
| |
| sg_init_table(sg, nfrags); |
| skb_to_sgvec(skb, sg, 0, skb->len); |
| |
| ahash_request_set_crypt(req, sg, icv, skb->len); |
| ahash_request_set_callback(req, 0, ah6_input_done, skb); |
| |
| AH_SKB_CB(skb)->tmp = work_iph; |
| |
| err = crypto_ahash_digest(req); |
| if (err) { |
| if (err == -EINPROGRESS) |
| goto out; |
| |
| goto out_free; |
| } |
| |
| err = memcmp(icv, auth_data, ahp->icv_trunc_len) ? -EBADMSG: 0; |
| if (err) |
| goto out_free; |
| |
| skb->network_header += ah_hlen; |
| memcpy(skb_network_header(skb), work_iph, hdr_len); |
| __skb_pull(skb, ah_hlen + hdr_len); |
| |
| if (x->props.mode == XFRM_MODE_TUNNEL) |
| skb_reset_transport_header(skb); |
| else |
| skb_set_transport_header(skb, -hdr_len); |
| |
| err = nexthdr; |
| |
| out_free: |
| kfree(work_iph); |
| out: |
| return err; |
| } |
| |
| static void 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_DEST_UNREACH && |
| type != ICMPV6_PKT_TOOBIG && |
| type != NDISC_REDIRECT) |
| return; |
| |
| x = xfrm_state_lookup(net, skb->mark, (xfrm_address_t *)&iph->daddr, ah->spi, IPPROTO_AH, AF_INET6); |
| if (!x) |
| return; |
| |
| if (type == NDISC_REDIRECT) |
| ip6_redirect(skb, net, 0, 0); |
| else |
| ip6_update_pmtu(skb, net, info, 0, 0); |
| xfrm_state_put(x); |
| } |
| |
| 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 == NULL) |
| return -ENOMEM; |
| |
| ahash = crypto_alloc_ahash(x->aalg->alg_name, 0, 0); |
| if (IS_ERR(ahash)) |
| goto error; |
| |
| ahp->ahash = ahash; |
| if (crypto_ahash_setkey(ahash, x->aalg->alg_key, |
| (x->aalg->alg_key_len + 7) / 8)) |
| goto error; |
| |
| /* |
| * Lookup the algorithm description maintained by xfrm_algo, |
| * verify crypto transform properties, and store information |
| * we need for AH processing. This lookup cannot fail here |
| * after a successful crypto_alloc_hash(). |
| */ |
| aalg_desc = xfrm_aalg_get_byname(x->aalg->alg_name, 0); |
| BUG_ON(!aalg_desc); |
| |
| if (aalg_desc->uinfo.auth.icv_fullbits/8 != |
| crypto_ahash_digestsize(ahash)) { |
| pr_info("AH: %s digestsize %u != %hu\n", |
| x->aalg->alg_name, crypto_ahash_digestsize(ahash), |
| aalg_desc->uinfo.auth.icv_fullbits/8); |
| goto error; |
| } |
| |
| ahp->icv_full_len = aalg_desc->uinfo.auth.icv_fullbits/8; |
| ahp->icv_trunc_len = x->aalg->alg_trunc_len/8; |
| |
| BUG_ON(ahp->icv_trunc_len > MAX_AH_AUTH_LEN); |
| |
| 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 const struct xfrm_type ah6_type = |
| { |
| .description = "AH6", |
| .owner = THIS_MODULE, |
| .proto = IPPROTO_AH, |
| .flags = XFRM_TYPE_REPLAY_PROT, |
| .init_state = ah6_init_state, |
| .destructor = ah6_destroy, |
| .input = ah6_input, |
| .output = ah6_output, |
| .hdr_offset = xfrm6_find_1stfragopt, |
| }; |
| |
| static const struct inet6_protocol ah6_protocol = { |
| .handler = xfrm6_rcv, |
| .err_handler = ah6_err, |
| .flags = INET6_PROTO_NOPOLICY, |
| }; |
| |
| 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 (inet6_add_protocol(&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 (inet6_del_protocol(&ah6_protocol, IPPROTO_AH) < 0) |
| pr_info("%s: can't remove protocol\n", __func__); |
| |
| if (xfrm_unregister_type(&ah6_type, AF_INET6) < 0) |
| pr_info("%s: can't remove xfrm type\n", __func__); |
| |
| } |
| |
| module_init(ah6_init); |
| module_exit(ah6_fini); |
| |
| MODULE_LICENSE("GPL"); |
| MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_AH); |