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https://github.com/torvalds/linux.git
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esp4: Switch to new AEAD interface
This patch makes use of the new AEAD interface which uses a single SG list instead of separate lists for the AD and plain text. The IV generation is also now carried out through normal AEAD methods. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu
parent
69b0137f61
commit
7021b2e1cd
198
net/ipv4/esp4.c
198
net/ipv4/esp4.c
@ -49,7 +49,7 @@ static void *esp_alloc_tmp(struct crypto_aead *aead, int nfrags, int seqhilen)
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len = ALIGN(len, crypto_tfm_ctx_alignment());
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}
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len += sizeof(struct aead_givcrypt_request) + crypto_aead_reqsize(aead);
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len += sizeof(struct aead_request) + crypto_aead_reqsize(aead);
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len = ALIGN(len, __alignof__(struct scatterlist));
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len += sizeof(struct scatterlist) * nfrags;
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@ -68,17 +68,6 @@ static inline u8 *esp_tmp_iv(struct crypto_aead *aead, void *tmp, int seqhilen)
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crypto_aead_alignmask(aead) + 1) : tmp + seqhilen;
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}
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static inline struct aead_givcrypt_request *esp_tmp_givreq(
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struct crypto_aead *aead, u8 *iv)
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{
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struct aead_givcrypt_request *req;
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req = (void *)PTR_ALIGN(iv + crypto_aead_ivsize(aead),
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crypto_tfm_ctx_alignment());
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aead_givcrypt_set_tfm(req, aead);
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return req;
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}
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static inline struct aead_request *esp_tmp_req(struct crypto_aead *aead, u8 *iv)
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{
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struct aead_request *req;
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@ -97,14 +86,6 @@ static inline struct scatterlist *esp_req_sg(struct crypto_aead *aead,
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__alignof__(struct scatterlist));
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}
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static inline struct scatterlist *esp_givreq_sg(
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struct crypto_aead *aead, struct aead_givcrypt_request *req)
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{
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return (void *)ALIGN((unsigned long)(req + 1) +
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crypto_aead_reqsize(aead),
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__alignof__(struct scatterlist));
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}
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static void esp_output_done(struct crypto_async_request *base, int err)
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{
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struct sk_buff *skb = base->data;
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@ -113,14 +94,37 @@ static void esp_output_done(struct crypto_async_request *base, int err)
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xfrm_output_resume(skb, err);
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}
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/* Move ESP header back into place. */
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static void esp_restore_header(struct sk_buff *skb, unsigned int offset)
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{
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struct ip_esp_hdr *esph = (void *)(skb->data + offset);
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void *tmp = ESP_SKB_CB(skb)->tmp;
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__be32 *seqhi = esp_tmp_seqhi(tmp);
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esph->seq_no = esph->spi;
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esph->spi = *seqhi;
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}
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static void esp_output_restore_header(struct sk_buff *skb)
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{
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esp_restore_header(skb, skb_transport_offset(skb) - sizeof(__be32));
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}
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static void esp_output_done_esn(struct crypto_async_request *base, int err)
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{
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struct sk_buff *skb = base->data;
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esp_output_restore_header(skb);
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esp_output_done(base, err);
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}
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static int esp_output(struct xfrm_state *x, struct sk_buff *skb)
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{
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int err;
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struct ip_esp_hdr *esph;
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struct crypto_aead *aead;
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struct aead_givcrypt_request *req;
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struct aead_request *req;
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struct scatterlist *sg;
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struct scatterlist *asg;
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struct sk_buff *trailer;
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void *tmp;
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u8 *iv;
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@ -129,17 +133,19 @@ static int esp_output(struct xfrm_state *x, struct sk_buff *skb)
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int clen;
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int alen;
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int plen;
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int ivlen;
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int tfclen;
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int nfrags;
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int assoclen;
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int sglists;
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int seqhilen;
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__be32 *seqhi;
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__be64 seqno;
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/* skb is pure payload to encrypt */
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aead = x->data;
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alen = crypto_aead_authsize(aead);
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ivlen = crypto_aead_ivsize(aead);
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tfclen = 0;
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if (x->tfcpad) {
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@ -160,16 +166,14 @@ static int esp_output(struct xfrm_state *x, struct sk_buff *skb)
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nfrags = err;
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assoclen = sizeof(*esph);
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sglists = 1;
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seqhilen = 0;
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if (x->props.flags & XFRM_STATE_ESN) {
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sglists += 2;
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seqhilen += sizeof(__be32);
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assoclen += seqhilen;
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}
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tmp = esp_alloc_tmp(aead, nfrags + sglists, seqhilen);
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tmp = esp_alloc_tmp(aead, nfrags, seqhilen);
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if (!tmp) {
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err = -ENOMEM;
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goto error;
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@ -177,9 +181,8 @@ static int esp_output(struct xfrm_state *x, struct sk_buff *skb)
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seqhi = esp_tmp_seqhi(tmp);
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iv = esp_tmp_iv(aead, tmp, seqhilen);
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req = esp_tmp_givreq(aead, iv);
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asg = esp_givreq_sg(aead, req);
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sg = asg + sglists;
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req = esp_tmp_req(aead, iv);
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sg = esp_req_sg(aead, req);
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/* Fill padding... */
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tail = skb_tail_pointer(trailer);
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@ -235,36 +238,53 @@ static int esp_output(struct xfrm_state *x, struct sk_buff *skb)
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*skb_mac_header(skb) = IPPROTO_UDP;
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}
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esph->spi = x->id.spi;
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esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.low);
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aead_request_set_callback(req, 0, esp_output_done, skb);
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/* For ESN we move the header forward by 4 bytes to
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* accomodate the high bits. We will move it back after
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* encryption.
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*/
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if ((x->props.flags & XFRM_STATE_ESN)) {
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esph = (void *)(skb_transport_header(skb) - sizeof(__be32));
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*seqhi = esph->spi;
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esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.hi);
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aead_request_set_callback(req, 0, esp_output_done_esn, skb);
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}
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esph->spi = x->id.spi;
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sg_init_table(sg, nfrags);
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skb_to_sgvec(skb, sg,
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esph->enc_data + crypto_aead_ivsize(aead) - skb->data,
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clen + alen);
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(unsigned char *)esph - skb->data,
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assoclen + ivlen + clen + alen);
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if ((x->props.flags & XFRM_STATE_ESN)) {
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sg_init_table(asg, 3);
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sg_set_buf(asg, &esph->spi, sizeof(__be32));
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*seqhi = htonl(XFRM_SKB_CB(skb)->seq.output.hi);
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sg_set_buf(asg + 1, seqhi, seqhilen);
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sg_set_buf(asg + 2, &esph->seq_no, sizeof(__be32));
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} else
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sg_init_one(asg, esph, sizeof(*esph));
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aead_request_set_crypt(req, sg, sg, ivlen + clen, iv);
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aead_request_set_ad(req, assoclen);
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aead_givcrypt_set_callback(req, 0, esp_output_done, skb);
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aead_givcrypt_set_crypt(req, sg, sg, clen, iv);
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aead_givcrypt_set_assoc(req, asg, assoclen);
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aead_givcrypt_set_giv(req, esph->enc_data,
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XFRM_SKB_CB(skb)->seq.output.low);
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seqno = cpu_to_be64(XFRM_SKB_CB(skb)->seq.output.low +
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((u64)XFRM_SKB_CB(skb)->seq.output.hi << 32));
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memset(iv, 0, ivlen);
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memcpy(iv + ivlen - min(ivlen, 8), (u8 *)&seqno + 8 - min(ivlen, 8),
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min(ivlen, 8));
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ESP_SKB_CB(skb)->tmp = tmp;
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err = crypto_aead_givencrypt(req);
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if (err == -EINPROGRESS)
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err = crypto_aead_encrypt(req);
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switch (err) {
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case -EINPROGRESS:
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goto error;
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if (err == -EBUSY)
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case -EBUSY:
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err = NET_XMIT_DROP;
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break;
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case 0:
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if ((x->props.flags & XFRM_STATE_ESN))
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esp_output_restore_header(skb);
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}
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kfree(tmp);
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@ -363,6 +383,20 @@ static void esp_input_done(struct crypto_async_request *base, int err)
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xfrm_input_resume(skb, esp_input_done2(skb, err));
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}
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static void esp_input_restore_header(struct sk_buff *skb)
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{
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esp_restore_header(skb, 0);
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__skb_pull(skb, 4);
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}
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static void esp_input_done_esn(struct crypto_async_request *base, int err)
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{
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struct sk_buff *skb = base->data;
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esp_input_restore_header(skb);
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esp_input_done(base, err);
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}
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/*
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* Note: detecting truncated vs. non-truncated authentication data is very
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* expensive, so we only support truncated data, which is the recommended
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@ -374,19 +408,18 @@ static int esp_input(struct xfrm_state *x, struct sk_buff *skb)
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struct crypto_aead *aead = x->data;
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struct aead_request *req;
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struct sk_buff *trailer;
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int elen = skb->len - sizeof(*esph) - crypto_aead_ivsize(aead);
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int ivlen = crypto_aead_ivsize(aead);
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int elen = skb->len - sizeof(*esph) - ivlen;
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int nfrags;
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int assoclen;
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int sglists;
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int seqhilen;
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__be32 *seqhi;
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void *tmp;
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u8 *iv;
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struct scatterlist *sg;
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struct scatterlist *asg;
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int err = -EINVAL;
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if (!pskb_may_pull(skb, sizeof(*esph) + crypto_aead_ivsize(aead)))
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if (!pskb_may_pull(skb, sizeof(*esph) + ivlen))
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goto out;
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if (elen <= 0)
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@ -399,17 +432,15 @@ static int esp_input(struct xfrm_state *x, struct sk_buff *skb)
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nfrags = err;
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assoclen = sizeof(*esph);
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sglists = 1;
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seqhilen = 0;
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if (x->props.flags & XFRM_STATE_ESN) {
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sglists += 2;
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seqhilen += sizeof(__be32);
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assoclen += seqhilen;
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}
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err = -ENOMEM;
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tmp = esp_alloc_tmp(aead, nfrags + sglists, seqhilen);
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tmp = esp_alloc_tmp(aead, nfrags, seqhilen);
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if (!tmp)
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goto out;
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@ -417,36 +448,39 @@ static int esp_input(struct xfrm_state *x, struct sk_buff *skb)
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seqhi = esp_tmp_seqhi(tmp);
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iv = esp_tmp_iv(aead, tmp, seqhilen);
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req = esp_tmp_req(aead, iv);
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asg = esp_req_sg(aead, req);
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sg = asg + sglists;
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sg = esp_req_sg(aead, req);
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skb->ip_summed = CHECKSUM_NONE;
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esph = (struct ip_esp_hdr *)skb->data;
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/* Get ivec. This can be wrong, check against another impls. */
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iv = esph->enc_data;
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aead_request_set_callback(req, 0, esp_input_done, skb);
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/* For ESN we move the header forward by 4 bytes to
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* accomodate the high bits. We will move it back after
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* decryption.
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*/
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if ((x->props.flags & XFRM_STATE_ESN)) {
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esph = (void *)skb_push(skb, 4);
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*seqhi = esph->spi;
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esph->spi = esph->seq_no;
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esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.input.hi);
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aead_request_set_callback(req, 0, esp_input_done_esn, skb);
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}
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sg_init_table(sg, nfrags);
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skb_to_sgvec(skb, sg, sizeof(*esph) + crypto_aead_ivsize(aead), elen);
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skb_to_sgvec(skb, sg, 0, skb->len);
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if ((x->props.flags & XFRM_STATE_ESN)) {
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sg_init_table(asg, 3);
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sg_set_buf(asg, &esph->spi, sizeof(__be32));
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*seqhi = XFRM_SKB_CB(skb)->seq.input.hi;
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sg_set_buf(asg + 1, seqhi, seqhilen);
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sg_set_buf(asg + 2, &esph->seq_no, sizeof(__be32));
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} else
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sg_init_one(asg, esph, sizeof(*esph));
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aead_request_set_callback(req, 0, esp_input_done, skb);
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aead_request_set_crypt(req, sg, sg, elen, iv);
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aead_request_set_assoc(req, asg, assoclen);
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aead_request_set_crypt(req, sg, sg, elen + ivlen, iv);
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aead_request_set_ad(req, assoclen);
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err = crypto_aead_decrypt(req);
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if (err == -EINPROGRESS)
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goto out;
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if ((x->props.flags & XFRM_STATE_ESN))
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esp_input_restore_header(skb);
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err = esp_input_done2(skb, err);
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out:
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@ -518,10 +552,16 @@ static void esp_destroy(struct xfrm_state *x)
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static int esp_init_aead(struct xfrm_state *x)
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{
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char aead_name[CRYPTO_MAX_ALG_NAME];
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struct crypto_aead *aead;
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int err;
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aead = crypto_alloc_aead(x->aead->alg_name, 0, 0);
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err = -ENAMETOOLONG;
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if (snprintf(aead_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
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x->geniv, x->aead->alg_name) >= CRYPTO_MAX_ALG_NAME)
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goto error;
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aead = crypto_alloc_aead(aead_name, 0, 0);
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err = PTR_ERR(aead);
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if (IS_ERR(aead))
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goto error;
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@ -560,15 +600,19 @@ static int esp_init_authenc(struct xfrm_state *x)
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if ((x->props.flags & XFRM_STATE_ESN)) {
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if (snprintf(authenc_name, CRYPTO_MAX_ALG_NAME,
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"authencesn(%s,%s)",
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"%s%sauthencesn(%s,%s)%s",
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x->geniv ?: "", x->geniv ? "(" : "",
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x->aalg ? x->aalg->alg_name : "digest_null",
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x->ealg->alg_name) >= CRYPTO_MAX_ALG_NAME)
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x->ealg->alg_name,
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x->geniv ? ")" : "") >= CRYPTO_MAX_ALG_NAME)
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goto error;
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} else {
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if (snprintf(authenc_name, CRYPTO_MAX_ALG_NAME,
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"authenc(%s,%s)",
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"%s%sauthenc(%s,%s)%s",
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x->geniv ?: "", x->geniv ? "(" : "",
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x->aalg ? x->aalg->alg_name : "digest_null",
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x->ealg->alg_name) >= CRYPTO_MAX_ALG_NAME)
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x->ealg->alg_name,
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x->geniv ? ")" : "") >= CRYPTO_MAX_ALG_NAME)
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goto error;
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}
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