crypto: af_alg - add async support to algif_aead
Following the async change for algif_skcipher this patch adds similar async read to algif_aead. changes in v3: - add call to aead_reset_ctx directly from aead_put_sgl instead of calling them separatelly one after the other - remove wait from aead_sock_destruct function as it is not needed when sock_hold is used changes in v2: - change internal data structures from fixed size arrays, limited to RSGL_MAX_ENTRIES, to linked list model with no artificial limitation. - use sock_kmalloc instead of kmalloc for memory allocation - use sock_hold instead of separate atomic ctr to wait for outstanding request Signed-off-by: Tadeusz Struk <tadeusz.struk@intel.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Tadeusz Struk
Herbert Xu
parent
47cd30608f
commit
83094e5e9e
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@ -13,7 +13,7 @@
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* any later version.
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*/
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#include <crypto/aead.h>
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#include <crypto/internal/aead.h>
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#include <crypto/scatterwalk.h>
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#include <crypto/if_alg.h>
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#include <linux/init.h>
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@ -29,15 +29,24 @@ struct aead_sg_list {
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struct scatterlist sg[ALG_MAX_PAGES];
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};
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struct aead_async_rsgl {
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struct af_alg_sgl sgl;
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struct list_head list;
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};
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struct aead_async_req {
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struct scatterlist *tsgl;
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struct aead_async_rsgl first_rsgl;
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struct list_head list;
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struct kiocb *iocb;
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unsigned int tsgls;
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char iv[];
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};
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struct aead_ctx {
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struct aead_sg_list tsgl;
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/*
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* RSGL_MAX_ENTRIES is an artificial limit where user space at maximum
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* can cause the kernel to allocate RSGL_MAX_ENTRIES * ALG_MAX_PAGES
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* pages
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*/
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#define RSGL_MAX_ENTRIES ALG_MAX_PAGES
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struct af_alg_sgl rsgl[RSGL_MAX_ENTRIES];
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struct aead_async_rsgl first_rsgl;
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struct list_head list;
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void *iv;
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@ -75,6 +84,17 @@ static inline bool aead_sufficient_data(struct aead_ctx *ctx)
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return ctx->used >= ctx->aead_assoclen + as;
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}
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static void aead_reset_ctx(struct aead_ctx *ctx)
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{
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struct aead_sg_list *sgl = &ctx->tsgl;
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sg_init_table(sgl->sg, ALG_MAX_PAGES);
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sgl->cur = 0;
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ctx->used = 0;
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ctx->more = 0;
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ctx->merge = 0;
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}
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static void aead_put_sgl(struct sock *sk)
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{
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struct alg_sock *ask = alg_sk(sk);
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@ -90,11 +110,7 @@ static void aead_put_sgl(struct sock *sk)
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put_page(sg_page(sg + i));
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sg_assign_page(sg + i, NULL);
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}
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sg_init_table(sg, ALG_MAX_PAGES);
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sgl->cur = 0;
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ctx->used = 0;
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ctx->more = 0;
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ctx->merge = 0;
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aead_reset_ctx(ctx);
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}
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static void aead_wmem_wakeup(struct sock *sk)
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@ -349,23 +365,188 @@ unlock:
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return err ?: size;
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}
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static int aead_recvmsg(struct socket *sock, struct msghdr *msg, size_t ignored, int flags)
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#define GET_ASYM_REQ(req, tfm) (struct aead_async_req *) \
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((char *)req + sizeof(struct aead_request) + \
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crypto_aead_reqsize(tfm))
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#define GET_REQ_SIZE(tfm) sizeof(struct aead_async_req) + \
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crypto_aead_reqsize(tfm) + crypto_aead_ivsize(tfm) + \
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sizeof(struct aead_request)
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static void aead_async_cb(struct crypto_async_request *_req, int err)
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{
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struct sock *sk = _req->data;
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struct alg_sock *ask = alg_sk(sk);
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struct aead_ctx *ctx = ask->private;
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struct crypto_aead *tfm = crypto_aead_reqtfm(&ctx->aead_req);
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struct aead_request *req = aead_request_cast(_req);
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struct aead_async_req *areq = GET_ASYM_REQ(req, tfm);
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struct scatterlist *sg = areq->tsgl;
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struct aead_async_rsgl *rsgl;
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struct kiocb *iocb = areq->iocb;
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unsigned int i, reqlen = GET_REQ_SIZE(tfm);
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list_for_each_entry(rsgl, &areq->list, list) {
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af_alg_free_sg(&rsgl->sgl);
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if (rsgl != &areq->first_rsgl)
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sock_kfree_s(sk, rsgl, sizeof(*rsgl));
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}
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for (i = 0; i < areq->tsgls; i++)
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put_page(sg_page(sg + i));
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sock_kfree_s(sk, areq->tsgl, sizeof(*areq->tsgl) * areq->tsgls);
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sock_kfree_s(sk, req, reqlen);
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__sock_put(sk);
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iocb->ki_complete(iocb, err, err);
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}
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static int aead_recvmsg_async(struct socket *sock, struct msghdr *msg,
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int flags)
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{
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struct sock *sk = sock->sk;
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struct alg_sock *ask = alg_sk(sk);
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struct aead_ctx *ctx = ask->private;
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struct crypto_aead *tfm = crypto_aead_reqtfm(&ctx->aead_req);
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struct aead_async_req *areq;
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struct aead_request *req = NULL;
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struct aead_sg_list *sgl = &ctx->tsgl;
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struct aead_async_rsgl *last_rsgl = NULL, *rsgl;
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unsigned int as = crypto_aead_authsize(tfm);
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unsigned int i, reqlen = GET_REQ_SIZE(tfm);
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int err = -ENOMEM;
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unsigned long used;
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size_t outlen;
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size_t usedpages = 0;
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lock_sock(sk);
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if (ctx->more) {
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err = aead_wait_for_data(sk, flags);
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if (err)
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goto unlock;
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}
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used = ctx->used;
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outlen = used;
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if (!aead_sufficient_data(ctx))
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goto unlock;
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req = sock_kmalloc(sk, reqlen, GFP_KERNEL);
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if (unlikely(!req))
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goto unlock;
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areq = GET_ASYM_REQ(req, tfm);
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memset(&areq->first_rsgl, '\0', sizeof(areq->first_rsgl));
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INIT_LIST_HEAD(&areq->list);
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areq->iocb = msg->msg_iocb;
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memcpy(areq->iv, ctx->iv, crypto_aead_ivsize(tfm));
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aead_request_set_tfm(req, tfm);
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aead_request_set_ad(req, ctx->aead_assoclen);
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aead_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG,
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aead_async_cb, sk);
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used -= ctx->aead_assoclen + (ctx->enc ? as : 0);
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/* take over all tx sgls from ctx */
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areq->tsgl = sock_kmalloc(sk, sizeof(*areq->tsgl) * sgl->cur,
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GFP_KERNEL);
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if (unlikely(!areq->tsgl))
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goto free;
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sg_init_table(areq->tsgl, sgl->cur);
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for (i = 0; i < sgl->cur; i++)
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sg_set_page(&areq->tsgl[i], sg_page(&sgl->sg[i]),
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sgl->sg[i].length, sgl->sg[i].offset);
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areq->tsgls = sgl->cur;
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/* create rx sgls */
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while (iov_iter_count(&msg->msg_iter)) {
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size_t seglen = min_t(size_t, iov_iter_count(&msg->msg_iter),
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(outlen - usedpages));
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if (list_empty(&areq->list)) {
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rsgl = &areq->first_rsgl;
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} else {
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rsgl = sock_kmalloc(sk, sizeof(*rsgl), GFP_KERNEL);
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if (unlikely(!rsgl)) {
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err = -ENOMEM;
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goto free;
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}
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}
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rsgl->sgl.npages = 0;
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list_add_tail(&rsgl->list, &areq->list);
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/* make one iovec available as scatterlist */
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err = af_alg_make_sg(&rsgl->sgl, &msg->msg_iter, seglen);
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if (err < 0)
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goto free;
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usedpages += err;
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/* chain the new scatterlist with previous one */
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if (last_rsgl)
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af_alg_link_sg(&last_rsgl->sgl, &rsgl->sgl);
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last_rsgl = rsgl;
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/* we do not need more iovecs as we have sufficient memory */
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if (outlen <= usedpages)
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break;
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iov_iter_advance(&msg->msg_iter, err);
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}
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err = -EINVAL;
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/* ensure output buffer is sufficiently large */
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if (usedpages < outlen)
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goto free;
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aead_request_set_crypt(req, areq->tsgl, areq->first_rsgl.sgl.sg, used,
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areq->iv);
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err = ctx->enc ? crypto_aead_encrypt(req) : crypto_aead_decrypt(req);
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if (err) {
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if (err == -EINPROGRESS) {
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sock_hold(sk);
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err = -EIOCBQUEUED;
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aead_reset_ctx(ctx);
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goto unlock;
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} else if (err == -EBADMSG) {
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aead_put_sgl(sk);
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}
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goto free;
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}
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aead_put_sgl(sk);
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free:
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list_for_each_entry(rsgl, &areq->list, list) {
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af_alg_free_sg(&rsgl->sgl);
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if (rsgl != &areq->first_rsgl)
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sock_kfree_s(sk, rsgl, sizeof(*rsgl));
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}
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if (areq->tsgl)
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sock_kfree_s(sk, areq->tsgl, sizeof(*areq->tsgl) * areq->tsgls);
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if (req)
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sock_kfree_s(sk, req, reqlen);
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unlock:
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aead_wmem_wakeup(sk);
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release_sock(sk);
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return err ? err : outlen;
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}
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static int aead_recvmsg_sync(struct socket *sock, struct msghdr *msg, int flags)
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{
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struct sock *sk = sock->sk;
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struct alg_sock *ask = alg_sk(sk);
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struct aead_ctx *ctx = ask->private;
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unsigned as = crypto_aead_authsize(crypto_aead_reqtfm(&ctx->aead_req));
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struct aead_sg_list *sgl = &ctx->tsgl;
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unsigned int i = 0;
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struct aead_async_rsgl *last_rsgl = NULL;
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struct aead_async_rsgl *rsgl, *tmp;
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int err = -EINVAL;
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unsigned long used = 0;
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size_t outlen = 0;
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size_t usedpages = 0;
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unsigned int cnt = 0;
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/* Limit number of IOV blocks to be accessed below */
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if (msg->msg_iter.nr_segs > RSGL_MAX_ENTRIES)
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return -ENOMSG;
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lock_sock(sk);
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@ -417,21 +598,33 @@ static int aead_recvmsg(struct socket *sock, struct msghdr *msg, size_t ignored,
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size_t seglen = min_t(size_t, iov_iter_count(&msg->msg_iter),
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(outlen - usedpages));
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if (list_empty(&ctx->list)) {
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rsgl = &ctx->first_rsgl;
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} else {
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rsgl = sock_kmalloc(sk, sizeof(*rsgl), GFP_KERNEL);
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if (unlikely(!rsgl)) {
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err = -ENOMEM;
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goto unlock;
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}
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}
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rsgl->sgl.npages = 0;
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list_add_tail(&rsgl->list, &ctx->list);
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/* make one iovec available as scatterlist */
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err = af_alg_make_sg(&ctx->rsgl[cnt], &msg->msg_iter,
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seglen);
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err = af_alg_make_sg(&rsgl->sgl, &msg->msg_iter, seglen);
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if (err < 0)
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goto unlock;
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usedpages += err;
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/* chain the new scatterlist with previous one */
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if (cnt)
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af_alg_link_sg(&ctx->rsgl[cnt-1], &ctx->rsgl[cnt]);
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if (last_rsgl)
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af_alg_link_sg(&last_rsgl->sgl, &rsgl->sgl);
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last_rsgl = rsgl;
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/* we do not need more iovecs as we have sufficient memory */
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if (outlen <= usedpages)
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break;
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iov_iter_advance(&msg->msg_iter, err);
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cnt++;
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}
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err = -EINVAL;
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@ -440,8 +633,7 @@ static int aead_recvmsg(struct socket *sock, struct msghdr *msg, size_t ignored,
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goto unlock;
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sg_mark_end(sgl->sg + sgl->cur - 1);
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aead_request_set_crypt(&ctx->aead_req, sgl->sg, ctx->rsgl[0].sg,
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aead_request_set_crypt(&ctx->aead_req, sgl->sg, ctx->first_rsgl.sgl.sg,
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used, ctx->iv);
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aead_request_set_ad(&ctx->aead_req, ctx->aead_assoclen);
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@ -454,23 +646,35 @@ static int aead_recvmsg(struct socket *sock, struct msghdr *msg, size_t ignored,
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/* EBADMSG implies a valid cipher operation took place */
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if (err == -EBADMSG)
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aead_put_sgl(sk);
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goto unlock;
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}
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aead_put_sgl(sk);
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err = 0;
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unlock:
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for (i = 0; i < cnt; i++)
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af_alg_free_sg(&ctx->rsgl[i]);
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list_for_each_entry_safe(rsgl, tmp, &ctx->list, list) {
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af_alg_free_sg(&rsgl->sgl);
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if (rsgl != &ctx->first_rsgl)
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sock_kfree_s(sk, rsgl, sizeof(*rsgl));
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list_del(&rsgl->list);
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}
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INIT_LIST_HEAD(&ctx->list);
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aead_wmem_wakeup(sk);
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release_sock(sk);
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return err ? err : outlen;
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}
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static int aead_recvmsg(struct socket *sock, struct msghdr *msg, size_t ignored,
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int flags)
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{
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return (msg->msg_iocb && !is_sync_kiocb(msg->msg_iocb)) ?
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aead_recvmsg_async(sock, msg, flags) :
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aead_recvmsg_sync(sock, msg, flags);
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}
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static unsigned int aead_poll(struct file *file, struct socket *sock,
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poll_table *wait)
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{
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@ -540,6 +744,7 @@ static void aead_sock_destruct(struct sock *sk)
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unsigned int ivlen = crypto_aead_ivsize(
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crypto_aead_reqtfm(&ctx->aead_req));
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WARN_ON(atomic_read(&sk->sk_refcnt) != 0);
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aead_put_sgl(sk);
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sock_kzfree_s(sk, ctx->iv, ivlen);
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sock_kfree_s(sk, ctx, ctx->len);
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@ -574,6 +779,7 @@ static int aead_accept_parent(void *private, struct sock *sk)
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ctx->aead_assoclen = 0;
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af_alg_init_completion(&ctx->completion);
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sg_init_table(ctx->tsgl.sg, ALG_MAX_PAGES);
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INIT_LIST_HEAD(&ctx->list);
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ask->private = ctx;
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