forked from Minki/linux
ah6: convert to ahash
This patch converts ah6 to the new ahash interface. Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Steffen Klassert
David S. Miller
parent
dff3bb0626
commit
8631e9bdfe
358
net/ipv6/ah6.c
358
net/ipv6/ah6.c
@ -24,18 +24,92 @@
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* This file is derived from net/ipv4/ah.c.
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*/
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#include <crypto/hash.h>
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#include <linux/module.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/spinlock.h>
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#include <linux/string.h>
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#include <linux/scatterlist.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 defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
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struct in6_addr saddr;
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#endif
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struct in6_addr daddr;
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char hdrs[0];
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};
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struct ah_skb_cb {
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struct xfrm_skb_cb xfrm;
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void *tmp;
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};
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#define AH_SKB_CB(__skb) ((struct ah_skb_cb *)&((__skb)->cb[0]))
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static void *ah_alloc_tmp(struct crypto_ahash *ahash, int nfrags,
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unsigned int size)
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{
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unsigned int len;
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len = size + crypto_ahash_digestsize(ahash) +
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(crypto_ahash_alignmask(ahash) &
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~(crypto_tfm_ctx_alignment() - 1));
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len = ALIGN(len, crypto_tfm_ctx_alignment());
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len += sizeof(struct ahash_request) + crypto_ahash_reqsize(ahash);
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len = ALIGN(len, __alignof__(struct scatterlist));
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len += sizeof(struct scatterlist) * nfrags;
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return kmalloc(len, GFP_ATOMIC);
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}
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static inline struct tmp_ext *ah_tmp_ext(void *base)
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{
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return base + IPV6HDR_BASELEN;
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}
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static inline u8 *ah_tmp_auth(u8 *tmp, unsigned int offset)
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{
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return tmp + offset;
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}
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static inline u8 *ah_tmp_icv(struct crypto_ahash *ahash, void *tmp,
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unsigned int offset)
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{
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return PTR_ALIGN((u8 *)tmp + offset, crypto_ahash_alignmask(ahash) + 1);
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}
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static inline struct ahash_request *ah_tmp_req(struct crypto_ahash *ahash,
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u8 *icv)
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{
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struct ahash_request *req;
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req = (void *)PTR_ALIGN(icv + crypto_ahash_digestsize(ahash),
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crypto_tfm_ctx_alignment());
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ahash_request_set_tfm(req, ahash);
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return req;
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}
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static inline struct scatterlist *ah_req_sg(struct crypto_ahash *ahash,
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struct ahash_request *req)
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{
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return (void *)ALIGN((unsigned long)(req + 1) +
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crypto_ahash_reqsize(ahash),
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__alignof__(struct scatterlist));
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}
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static int 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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@ -218,24 +292,85 @@ static int ipv6_clear_mutable_options(struct ipv6hdr *iph, int len, int dir)
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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 defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
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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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err = ah->nexthdr;
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kfree(AH_SKB_CB(skb)->tmp);
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xfrm_output_resume(skb, err);
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}
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static int ah6_output(struct xfrm_state *x, struct sk_buff *skb)
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{
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int err;
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int nfrags;
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int extlen;
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u8 *iph_base;
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u8 *icv;
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u8 nexthdr;
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struct sk_buff *trailer;
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struct crypto_ahash *ahash;
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struct ahash_request *req;
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struct scatterlist *sg;
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struct ipv6hdr *top_iph;
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struct ip_auth_hdr *ah;
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struct ah_data *ahp;
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u8 nexthdr;
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char tmp_base[8];
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struct {
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#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
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struct in6_addr saddr;
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#endif
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struct in6_addr daddr;
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char hdrs[0];
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} *tmp_ext;
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struct tmp_ext *iph_ext;
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ahp = x->data;
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ahash = ahp->ahash;
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if ((err = skb_cow_data(skb, 0, &trailer)) < 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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err = -ENOMEM;
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iph_base = ah_alloc_tmp(ahash, nfrags, IPV6HDR_BASELEN + extlen);
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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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icv = ah_tmp_icv(ahash, iph_ext, extlen);
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req = ah_tmp_req(ahash, icv);
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sg = ah_req_sg(ahash, req);
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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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@ -245,31 +380,22 @@ static int ah6_output(struct xfrm_state *x, struct sk_buff *skb)
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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(tmp_base, top_iph, sizeof(tmp_base));
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memcpy(iph_base, top_iph, IPV6HDR_BASELEN);
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tmp_ext = NULL;
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extlen = skb_transport_offset(skb) - sizeof(struct ipv6hdr);
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if (extlen) {
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extlen += sizeof(*tmp_ext);
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tmp_ext = kmalloc(extlen, GFP_ATOMIC);
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if (!tmp_ext) {
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err = -ENOMEM;
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goto error;
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}
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#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
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memcpy(tmp_ext, &top_iph->saddr, extlen);
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memcpy(iph_ext, &top_iph->saddr, extlen);
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#else
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memcpy(tmp_ext, &top_iph->daddr, extlen);
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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(*tmp_ext) +
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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 error_free_iph;
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goto out_free;
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}
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ah = ip_auth_hdr(skb);
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ah->nexthdr = nexthdr;
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top_iph->priority = 0;
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@ -278,36 +404,80 @@ static int ah6_output(struct xfrm_state *x, struct sk_buff *skb)
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top_iph->flow_lbl[2] = 0;
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top_iph->hop_limit = 0;
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ahp = x->data;
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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);
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spin_lock_bh(&x->lock);
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err = ah_mac_digest(ahp, skb, ah->auth_data);
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memcpy(ah->auth_data, ahp->work_icv, ahp->icv_trunc_len);
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spin_unlock_bh(&x->lock);
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sg_init_table(sg, nfrags);
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skb_to_sgvec(skb, sg, 0, skb->len);
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if (err)
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goto error_free_iph;
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ahash_request_set_crypt(req, sg, icv, skb->len);
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ahash_request_set_callback(req, 0, ah6_output_done, skb);
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memcpy(top_iph, tmp_base, sizeof(tmp_base));
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if (tmp_ext) {
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#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
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memcpy(&top_iph->saddr, tmp_ext, extlen);
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#else
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memcpy(&top_iph->daddr, tmp_ext, extlen);
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#endif
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error_free_iph:
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kfree(tmp_ext);
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AH_SKB_CB(skb)->tmp = iph_base;
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err = crypto_ahash_digest(req);
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if (err) {
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if (err == -EINPROGRESS)
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goto out;
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if (err == -EBUSY)
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err = NET_XMIT_DROP;
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goto out_free;
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}
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error:
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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 defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
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memcpy(&top_iph->saddr, iph_ext, extlen);
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#else
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memcpy(&top_iph->daddr, iph_ext, extlen);
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#endif
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}
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out_free:
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kfree(iph_base);
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out:
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return err;
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}
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static void ah6_input_done(struct crypto_async_request *base, int err)
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{
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u8 *auth_data;
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u8 *icv;
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u8 *work_iph;
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struct sk_buff *skb = base->data;
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struct xfrm_state *x = xfrm_input_state(skb);
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struct ah_data *ahp = x->data;
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struct ip_auth_hdr *ah = ip_auth_hdr(skb);
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int hdr_len = skb_network_header_len(skb);
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int ah_hlen = (ah->hdrlen + 2) << 2;
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work_iph = AH_SKB_CB(skb)->tmp;
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auth_data = ah_tmp_auth(work_iph, hdr_len);
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icv = ah_tmp_icv(ahp->ahash, auth_data, ahp->icv_trunc_len);
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err = memcmp(icv, auth_data, ahp->icv_trunc_len) ? -EBADMSG: 0;
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if (err)
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goto out;
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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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skb_set_transport_header(skb, -hdr_len);
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err = ah->nexthdr;
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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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@ -325,14 +495,21 @@ static int ah6_input(struct xfrm_state *x, struct sk_buff *skb)
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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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unsigned char *tmp_hdr = NULL;
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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 err = -EINVAL;
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int nfrags;
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int err = -ENOMEM;
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if (!pskb_may_pull(skb, sizeof(struct ip_auth_hdr)))
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goto out;
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@ -345,9 +522,11 @@ static int ah6_input(struct xfrm_state *x, struct sk_buff *skb)
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skb->ip_summed = CHECKSUM_NONE;
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hdr_len = skb->data - skb_network_header(skb);
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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 = (ah->hdrlen + 2) << 2;
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@ -358,48 +537,67 @@ static int ah6_input(struct xfrm_state *x, struct sk_buff *skb)
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if (!pskb_may_pull(skb, ah_hlen))
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goto out;
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tmp_hdr = kmemdup(skb_network_header(skb), hdr_len, GFP_ATOMIC);
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if (!tmp_hdr)
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goto out;
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ip6h = ipv6_hdr(skb);
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skb_push(skb, hdr_len);
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if ((err = skb_cow_data(skb, 0, &trailer)) < 0)
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goto out;
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nfrags = err;
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work_iph = ah_alloc_tmp(ahash, nfrags, hdr_len + ahp->icv_trunc_len);
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if (!work_iph)
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goto out;
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auth_data = ah_tmp_auth(work_iph, hdr_len);
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icv = ah_tmp_icv(ahash, auth_data, ahp->icv_trunc_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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memcpy(work_iph, ip6h, hdr_len);
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memcpy(auth_data, ah->auth_data, ahp->icv_trunc_len);
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memset(ah->auth_data, 0, ahp->icv_trunc_len);
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if (ipv6_clear_mutable_options(ip6h, hdr_len, XFRM_POLICY_IN))
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goto free_out;
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goto out_free;
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ip6h->priority = 0;
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ip6h->flow_lbl[0] = 0;
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ip6h->flow_lbl[1] = 0;
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ip6h->flow_lbl[2] = 0;
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ip6h->hop_limit = 0;
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spin_lock(&x->lock);
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{
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u8 auth_data[MAX_AH_AUTH_LEN];
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sg_init_table(sg, nfrags);
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skb_to_sgvec(skb, sg, 0, skb->len);
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memcpy(auth_data, ah->auth_data, ahp->icv_trunc_len);
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memset(ah->auth_data, 0, ahp->icv_trunc_len);
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skb_push(skb, hdr_len);
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err = ah_mac_digest(ahp, skb, ah->auth_data);
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if (err)
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goto unlock;
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if (memcmp(ahp->work_icv, auth_data, ahp->icv_trunc_len))
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err = -EBADMSG;
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ahash_request_set_crypt(req, sg, icv, skb->len);
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ahash_request_set_callback(req, 0, ah6_input_done, skb);
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AH_SKB_CB(skb)->tmp = work_iph;
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err = crypto_ahash_digest(req);
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if (err) {
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if (err == -EINPROGRESS)
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goto out;
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if (err == -EBUSY)
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err = NET_XMIT_DROP;
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goto out_free;
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}
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unlock:
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spin_unlock(&x->lock);
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err = memcmp(icv, auth_data, ahp->icv_trunc_len) ? -EBADMSG: 0;
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if (err)
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goto free_out;
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goto out_free;
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skb->network_header += ah_hlen;
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memcpy(skb_network_header(skb), tmp_hdr, hdr_len);
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memcpy(skb_network_header(skb), work_iph, hdr_len);
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skb->transport_header = skb->network_header;
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__skb_pull(skb, ah_hlen + hdr_len);
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kfree(tmp_hdr);
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err = nexthdr;
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return nexthdr;
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free_out:
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kfree(tmp_hdr);
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out_free:
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kfree(work_iph);
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out:
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||||
return err;
|
||||
}
|
||||
@ -430,7 +628,7 @@ static int ah6_init_state(struct xfrm_state *x)
|
||||
{
|
||||
struct ah_data *ahp = NULL;
|
||||
struct xfrm_algo_desc *aalg_desc;
|
||||
struct crypto_hash *tfm;
|
||||
struct crypto_ahash *ahash;
|
||||
|
||||
if (!x->aalg)
|
||||
goto error;
|
||||
@ -442,12 +640,12 @@ static int ah6_init_state(struct xfrm_state *x)
|
||||
if (ahp == NULL)
|
||||
return -ENOMEM;
|
||||
|
||||
tfm = crypto_alloc_hash(x->aalg->alg_name, 0, CRYPTO_ALG_ASYNC);
|
||||
if (IS_ERR(tfm))
|
||||
ahash = crypto_alloc_ahash(x->aalg->alg_name, 0, 0);
|
||||
if (IS_ERR(ahash))
|
||||
goto error;
|
||||
|
||||
ahp->tfm = tfm;
|
||||
if (crypto_hash_setkey(tfm, x->aalg->alg_key,
|
||||
ahp->ahash = ahash;
|
||||
if (crypto_ahash_setkey(ahash, x->aalg->alg_key,
|
||||
(x->aalg->alg_key_len + 7) / 8))
|
||||
goto error;
|
||||
|
||||
@ -461,9 +659,9 @@ static int ah6_init_state(struct xfrm_state *x)
|
||||
BUG_ON(!aalg_desc);
|
||||
|
||||
if (aalg_desc->uinfo.auth.icv_fullbits/8 !=
|
||||
crypto_hash_digestsize(tfm)) {
|
||||
crypto_ahash_digestsize(ahash)) {
|
||||
printk(KERN_INFO "AH: %s digestsize %u != %hu\n",
|
||||
x->aalg->alg_name, crypto_hash_digestsize(tfm),
|
||||
x->aalg->alg_name, crypto_ahash_digestsize(ahash),
|
||||
aalg_desc->uinfo.auth.icv_fullbits/8);
|
||||
goto error;
|
||||
}
|
||||
@ -473,10 +671,6 @@ static int ah6_init_state(struct xfrm_state *x)
|
||||
|
||||
BUG_ON(ahp->icv_trunc_len > MAX_AH_AUTH_LEN);
|
||||
|
||||
ahp->work_icv = kmalloc(ahp->icv_full_len, GFP_KERNEL);
|
||||
if (!ahp->work_icv)
|
||||
goto error;
|
||||
|
||||
x->props.header_len = XFRM_ALIGN8(sizeof(struct ip_auth_hdr) +
|
||||
ahp->icv_trunc_len);
|
||||
switch (x->props.mode) {
|
||||
@ -495,8 +689,7 @@ static int ah6_init_state(struct xfrm_state *x)
|
||||
|
||||
error:
|
||||
if (ahp) {
|
||||
kfree(ahp->work_icv);
|
||||
crypto_free_hash(ahp->tfm);
|
||||
crypto_free_ahash(ahp->ahash);
|
||||
kfree(ahp);
|
||||
}
|
||||
return -EINVAL;
|
||||
@ -509,8 +702,7 @@ static void ah6_destroy(struct xfrm_state *x)
|
||||
if (!ahp)
|
||||
return;
|
||||
|
||||
kfree(ahp->work_icv);
|
||||
crypto_free_hash(ahp->tfm);
|
||||
crypto_free_ahash(ahp->ahash);
|
||||
kfree(ahp);
|
||||
}
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user