/*
* Generic encrypt/decrypt wrapper for ciphers, handles operations across
* multiple page boundaries by using temporary blocks. In user context,
* the kernel is given a chance to schedule us once per block.
*/
static int crypt(struct crypto_tfm *tfm,
struct scatterlist *dst,
struct scatterlist *src,
unsigned int nbytes, cryptfn_t crfn,
procfn_t prfn, int enc, void *info)
{
struct scatter_walk walk_in, walk_out;
const unsigned int bsize = crypto_tfm_alg_blocksize(tfm);
u8 tmp_src[bsize];
u8 tmp_dst[bsize];
if (!nbytes)
return 0;
if (nbytes % bsize) {
tfm->crt_flags |= CRYPTO_TFM_RES_BAD_BLOCK_LEN;
return -EINVAL;
}
scatterwalk_start(&walk_in, src);
scatterwalk_start(&walk_out, dst);
for(;;) {
u8 *src_p, *dst_p;
int in_place;
scatterwalk_map(&walk_in);
scatterwalk_map(&walk_out);
src_p = scatterwalk_whichbuf(&walk_in, bsize, tmp_src);
dst_p = scatterwalk_whichbuf(&walk_out, bsize, tmp_dst);
in_place = scatterwalk_samebuf(&walk_in, &walk_out,
src_p, dst_p);
nbytes -= bsize;
scatterwalk_copychunks(src_p, &walk_in, bsize, 0);
prfn(tfm, dst_p, src_p, crfn, enc, info, in_place);
scatterwalk_done(&walk_in, nbytes);
scatterwalk_copychunks(dst_p, &walk_out, bsize, 1);
scatterwalk_done(&walk_out, nbytes);
if (!nbytes)
return 0;
crypto_yield(tfm);
}
}
static inline int blkcipher_next_slow(struct blkcipher_desc *desc,
struct blkcipher_walk *walk,
unsigned int bsize,
unsigned int alignmask)
{
unsigned int n;
unsigned aligned_bsize = ALIGN(bsize, alignmask + 1);
if (walk->buffer)
goto ok;
walk->buffer = walk->page;
if (walk->buffer)
goto ok;
n = aligned_bsize * 3 - (alignmask + 1) +
(alignmask & ~(crypto_tfm_ctx_alignment() - 1));
walk->buffer = kmalloc(n, GFP_ATOMIC);
if (!walk->buffer)
return blkcipher_walk_done(desc, walk, -ENOMEM);
ok:
walk->dst.virt.addr = (u8 *)ALIGN((unsigned long)walk->buffer,
alignmask + 1);
walk->dst.virt.addr = blkcipher_get_spot(walk->dst.virt.addr, bsize);
walk->src.virt.addr = blkcipher_get_spot(walk->dst.virt.addr +
aligned_bsize, bsize);
scatterwalk_copychunks(walk->src.virt.addr, &walk->in, bsize, 0);
walk->nbytes = bsize;
walk->flags |= BLKCIPHER_WALK_SLOW;
return 0;
}
static inline unsigned int blkcipher_done_slow(struct blkcipher_walk *walk,
unsigned int bsize)
{
u8 *addr;
addr = (u8 *)ALIGN((unsigned long)walk->buffer, walk->alignmask + 1);
addr = blkcipher_get_spot(addr, bsize);
scatterwalk_copychunks(addr, &walk->out, bsize, 1);
return bsize;
}
static unsigned int crypt_slow(const struct cipher_desc *desc,
struct scatter_walk *in,
struct scatter_walk *out, unsigned int bsize)
{
unsigned long alignmask = crypto_tfm_alg_alignmask(desc->tfm);
u8 buffer[bsize * 2 + alignmask];
u8 *src = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
u8 *dst = src + bsize;
unsigned int n;
n = scatterwalk_copychunks(src, in, bsize, 0);
scatterwalk_advance(in, n);
desc->prfn(desc, dst, src, bsize);
n = scatterwalk_copychunks(dst, out, bsize, 1);
scatterwalk_advance(out, n);
return bsize;
}
static void sg_copy_buf(void *buf, struct scatterlist *sg,
unsigned int start, unsigned int nbytes, int out)
{
struct scatter_walk walk;
if (!nbytes)
return;
scatterwalk_start(&walk, sg);
scatterwalk_advance(&walk, start);
scatterwalk_copychunks(buf, &walk, nbytes, out);
scatterwalk_done(&walk, out, 0);
}
void scatterwalk_map_and_copy(void *buf, struct scatterlist *sg,
unsigned int start, unsigned int nbytes, int out)
{
struct scatter_walk walk;
struct scatterlist tmp[2];
if (!nbytes)
return;
sg = scatterwalk_ffwd(tmp, sg, start);
scatterwalk_start(&walk, sg);
scatterwalk_copychunks(buf, &walk, nbytes, out);
scatterwalk_done(&walk, out, 0);
}
void scatterwalk_map_and_copy(void *buf, struct scatterlist *sg,
unsigned int start, unsigned int nbytes, int out)
{
struct scatter_walk walk;
struct scatterlist tmp[2];
if (!nbytes)
return;
sg = scatterwalk_ffwd(tmp, sg, start);
if (sg_page(sg) == virt_to_page(buf) &&
sg->offset == offset_in_page(buf))
return;
scatterwalk_start(&walk, sg);
scatterwalk_copychunks(buf, &walk, nbytes, out);
scatterwalk_done(&walk, out, 0);
}
static int nx_gca(struct nx_crypto_ctx *nx_ctx,
struct aead_request *req,
u8 *out)
{
struct nx_csbcpb *csbcpb_aead = nx_ctx->csbcpb_aead;
int rc = -EINVAL;
struct scatter_walk walk;
struct nx_sg *nx_sg = nx_ctx->in_sg;
if (req->assoclen > nx_ctx->ap->databytelen)
goto out;
if (req->assoclen <= AES_BLOCK_SIZE) {
scatterwalk_start(&walk, req->assoc);
scatterwalk_copychunks(out, &walk, req->assoclen,
SCATTERWALK_FROM_SG);
scatterwalk_done(&walk, SCATTERWALK_FROM_SG, 0);
rc = 0;
goto out;
}
nx_sg = nx_walk_and_build(nx_sg, nx_ctx->ap->sglen, req->assoc, 0,
req->assoclen);
nx_ctx->op_aead.inlen = (nx_ctx->in_sg - nx_sg) * sizeof(struct nx_sg);
rc = nx_hcall_sync(nx_ctx, &nx_ctx->op_aead,
req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP);
if (rc)
goto out;
atomic_inc(&(nx_ctx->stats->aes_ops));
atomic64_add(req->assoclen, &(nx_ctx->stats->aes_bytes));
memcpy(out, csbcpb_aead->cpb.aes_gca.out_pat, AES_BLOCK_SIZE);
out:
return rc;
}
static int tls_enc_record(struct aead_request *aead_req,
struct crypto_aead *aead, char *aad,
char *iv, __be64 rcd_sn,
struct scatter_walk *in,
struct scatter_walk *out, int *in_len)
{
unsigned char buf[TLS_HEADER_SIZE + TLS_CIPHER_AES_GCM_128_IV_SIZE];
struct scatterlist sg_in[3];
struct scatterlist sg_out[3];
u16 len;
int rc;
len = min_t(int, *in_len, ARRAY_SIZE(buf));
scatterwalk_copychunks(buf, in, len, 0);
scatterwalk_copychunks(buf, out, len, 1);
*in_len -= len;
if (!*in_len)
return 0;
scatterwalk_pagedone(in, 0, 1);
scatterwalk_pagedone(out, 1, 1);
len = buf[4] | (buf[3] << 8);
len -= TLS_CIPHER_AES_GCM_128_IV_SIZE;
tls_make_aad(aad, len - TLS_CIPHER_AES_GCM_128_TAG_SIZE,
(char *)&rcd_sn, sizeof(rcd_sn), buf[0]);
memcpy(iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE, buf + TLS_HEADER_SIZE,
TLS_CIPHER_AES_GCM_128_IV_SIZE);
sg_init_table(sg_in, ARRAY_SIZE(sg_in));
sg_init_table(sg_out, ARRAY_SIZE(sg_out));
sg_set_buf(sg_in, aad, TLS_AAD_SPACE_SIZE);
sg_set_buf(sg_out, aad, TLS_AAD_SPACE_SIZE);
chain_to_walk(sg_in + 1, in);
chain_to_walk(sg_out + 1, out);
*in_len -= len;
if (*in_len < 0) {
*in_len += TLS_CIPHER_AES_GCM_128_TAG_SIZE;
/* the input buffer doesn't contain the entire record.
* trim len accordingly. The resulting authentication tag
* will contain garbage, but we don't care, so we won't
* include any of it in the output skb
* Note that we assume the output buffer length
* is larger then input buffer length + tag size
*/
if (*in_len < 0)
len += *in_len;
*in_len = 0;
}
if (*in_len) {
scatterwalk_copychunks(NULL, in, len, 2);
scatterwalk_pagedone(in, 0, 1);
scatterwalk_copychunks(NULL, out, len, 2);
scatterwalk_pagedone(out, 1, 1);
}
len -= TLS_CIPHER_AES_GCM_128_TAG_SIZE;
aead_request_set_crypt(aead_req, sg_in, sg_out, len, iv);
rc = crypto_aead_encrypt(aead_req);
return rc;
}
static int nx_gca(struct nx_crypto_ctx *nx_ctx,
struct aead_request *req,
u8 *out,
unsigned int assoclen)
{
int rc;
struct nx_csbcpb *csbcpb_aead = nx_ctx->csbcpb_aead;
struct scatter_walk walk;
struct nx_sg *nx_sg = nx_ctx->in_sg;
unsigned int nbytes = assoclen;
unsigned int processed = 0, to_process;
unsigned int max_sg_len;
if (nbytes <= AES_BLOCK_SIZE) {
scatterwalk_start(&walk, req->src);
scatterwalk_copychunks(out, &walk, nbytes, SCATTERWALK_FROM_SG);
scatterwalk_done(&walk, SCATTERWALK_FROM_SG, 0);
return 0;
}
NX_CPB_FDM(csbcpb_aead) &= ~NX_FDM_CONTINUATION;
/* page_limit: number of sg entries that fit on one page */
max_sg_len = min_t(u64, nx_driver.of.max_sg_len/sizeof(struct nx_sg),
nx_ctx->ap->sglen);
max_sg_len = min_t(u64, max_sg_len,
nx_ctx->ap->databytelen/NX_PAGE_SIZE);
do {
/*
* to_process: the data chunk to process in this update.
* This value is bound by sg list limits.
*/
to_process = min_t(u64, nbytes - processed,
nx_ctx->ap->databytelen);
to_process = min_t(u64, to_process,
NX_PAGE_SIZE * (max_sg_len - 1));
nx_sg = nx_walk_and_build(nx_ctx->in_sg, max_sg_len,
req->src, processed, &to_process);
if ((to_process + processed) < nbytes)
NX_CPB_FDM(csbcpb_aead) |= NX_FDM_INTERMEDIATE;
else
NX_CPB_FDM(csbcpb_aead) &= ~NX_FDM_INTERMEDIATE;
nx_ctx->op_aead.inlen = (nx_ctx->in_sg - nx_sg)
* sizeof(struct nx_sg);
rc = nx_hcall_sync(nx_ctx, &nx_ctx->op_aead,
req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP);
if (rc)
return rc;
memcpy(csbcpb_aead->cpb.aes_gca.in_pat,
csbcpb_aead->cpb.aes_gca.out_pat,
AES_BLOCK_SIZE);
NX_CPB_FDM(csbcpb_aead) |= NX_FDM_CONTINUATION;
atomic_inc(&(nx_ctx->stats->aes_ops));
atomic64_add(assoclen, &(nx_ctx->stats->aes_bytes));
processed += to_process;
} while (processed < nbytes);
memcpy(out, csbcpb_aead->cpb.aes_gca.out_pat, AES_BLOCK_SIZE);
return rc;
}
