*
* This file provides the user-space API for AEAD ciphers.
*
- * This file is derived from algif_skcipher.c.
- *
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
+ *
+ * The following concept of the memory management is used:
+ *
+ * The kernel maintains two SGLs, the TX SGL and the RX SGL. The TX SGL is
+ * filled by user space with the data submitted via sendpage/sendmsg. Filling
+ * up the TX SGL does not cause a crypto operation -- the data will only be
+ * tracked by the kernel. Upon receipt of one recvmsg call, the caller must
+ * provide a buffer which is tracked with the RX SGL.
+ *
+ * During the processing of the recvmsg operation, the cipher request is
+ * allocated and prepared. As part of the recvmsg operation, the processed
+ * TX buffers are extracted from the TX SGL into a separate SGL.
+ *
+ * After the completion of the crypto operation, the RX SGL and the cipher
+ * request is released. The extracted TX SGL parts are released together with
+ * the RX SGL release.
*/
#include <crypto/internal/aead.h>
#include <linux/net.h>
#include <net/sock.h>
-struct aead_sg_list {
- unsigned int cur;
- struct scatterlist sg[ALG_MAX_PAGES];
+struct aead_tsgl {
+ struct list_head list;
+ unsigned int cur; /* Last processed SG entry */
+ struct scatterlist sg[0]; /* Array of SGs forming the SGL */
};
-struct aead_async_rsgl {
+struct aead_rsgl {
struct af_alg_sgl sgl;
struct list_head list;
+ size_t sg_num_bytes; /* Bytes of data in that SGL */
};
struct aead_async_req {
- struct scatterlist *tsgl;
- struct aead_async_rsgl first_rsgl;
- struct list_head list;
struct kiocb *iocb;
struct sock *sk;
- unsigned int tsgls;
- char iv[];
+
+ struct aead_rsgl first_rsgl; /* First RX SG */
+ struct list_head rsgl_list; /* Track RX SGs */
+
+ struct scatterlist *tsgl; /* priv. TX SGL of buffers to process */
+ unsigned int tsgl_entries; /* number of entries in priv. TX SGL */
+
+ unsigned int outlen; /* Filled output buf length */
+
+ unsigned int areqlen; /* Length of this data struct */
+ struct aead_request aead_req; /* req ctx trails this struct */
};
struct aead_tfm {
};
struct aead_ctx {
- struct aead_sg_list tsgl;
- struct aead_async_rsgl first_rsgl;
- struct list_head list;
+ struct list_head tsgl_list; /* Link to TX SGL */
void *iv;
+ size_t aead_assoclen;
- struct af_alg_completion completion;
+ struct af_alg_completion completion; /* sync work queue */
- unsigned long used;
+ size_t used; /* TX bytes sent to kernel */
+ size_t rcvused; /* total RX bytes to be processed by kernel */
- unsigned int len;
- bool more;
- bool merge;
- bool enc;
+ bool more; /* More data to be expected? */
+ bool merge; /* Merge new data into existing SG */
+ bool enc; /* Crypto operation: enc, dec */
- size_t aead_assoclen;
- struct aead_request aead_req;
+ unsigned int len; /* Length of allocated memory for this struct */
};
+#define MAX_SGL_ENTS ((4096 - sizeof(struct aead_tsgl)) / \
+ sizeof(struct scatterlist) - 1)
+
static inline int aead_sndbuf(struct sock *sk)
{
struct alg_sock *ask = alg_sk(sk);
return PAGE_SIZE <= aead_sndbuf(sk);
}
-static inline bool aead_sufficient_data(struct aead_ctx *ctx)
+static inline int aead_rcvbuf(struct sock *sk)
{
- unsigned as = crypto_aead_authsize(crypto_aead_reqtfm(&ctx->aead_req));
+ struct alg_sock *ask = alg_sk(sk);
+ struct aead_ctx *ctx = ask->private;
+
+ return max_t(int, max_t(int, sk->sk_rcvbuf & PAGE_MASK, PAGE_SIZE) -
+ ctx->rcvused, 0);
+}
+
+static inline bool aead_readable(struct sock *sk)
+{
+ return PAGE_SIZE <= aead_rcvbuf(sk);
+}
+
+static inline bool aead_sufficient_data(struct sock *sk)
+{
+ struct alg_sock *ask = alg_sk(sk);
+ struct sock *psk = ask->parent;
+ struct alg_sock *pask = alg_sk(psk);
+ struct aead_ctx *ctx = ask->private;
+ struct aead_tfm *aeadc = pask->private;
+ struct crypto_aead *tfm = aeadc->aead;
+ unsigned int as = crypto_aead_authsize(tfm);
/*
* The minimum amount of memory needed for an AEAD cipher is
return ctx->used >= ctx->aead_assoclen + (ctx->enc ? 0 : as);
}
-static void aead_reset_ctx(struct aead_ctx *ctx)
+static int aead_alloc_tsgl(struct sock *sk)
{
- struct aead_sg_list *sgl = &ctx->tsgl;
+ struct alg_sock *ask = alg_sk(sk);
+ struct aead_ctx *ctx = ask->private;
+ struct aead_tsgl *sgl;
+ struct scatterlist *sg = NULL;
- sg_init_table(sgl->sg, ALG_MAX_PAGES);
- sgl->cur = 0;
- ctx->used = 0;
- ctx->more = 0;
- ctx->merge = 0;
+ sgl = list_entry(ctx->tsgl_list.prev, struct aead_tsgl, list);
+ if (!list_empty(&ctx->tsgl_list))
+ sg = sgl->sg;
+
+ if (!sg || sgl->cur >= MAX_SGL_ENTS) {
+ sgl = sock_kmalloc(sk, sizeof(*sgl) +
+ sizeof(sgl->sg[0]) * (MAX_SGL_ENTS + 1),
+ GFP_KERNEL);
+ if (!sgl)
+ return -ENOMEM;
+
+ sg_init_table(sgl->sg, MAX_SGL_ENTS + 1);
+ sgl->cur = 0;
+
+ if (sg)
+ sg_chain(sg, MAX_SGL_ENTS + 1, sgl->sg);
+
+ list_add_tail(&sgl->list, &ctx->tsgl_list);
+ }
+
+ return 0;
+}
+
+static unsigned int aead_count_tsgl(struct sock *sk, size_t bytes)
+{
+ struct alg_sock *ask = alg_sk(sk);
+ struct aead_ctx *ctx = ask->private;
+ struct aead_tsgl *sgl, *tmp;
+ unsigned int i;
+ unsigned int sgl_count = 0;
+
+ if (!bytes)
+ return 0;
+
+ list_for_each_entry_safe(sgl, tmp, &ctx->tsgl_list, list) {
+ struct scatterlist *sg = sgl->sg;
+
+ for (i = 0; i < sgl->cur; i++) {
+ sgl_count++;
+ if (sg[i].length >= bytes)
+ return sgl_count;
+
+ bytes -= sg[i].length;
+ }
+ }
+
+ return sgl_count;
}
-static void aead_put_sgl(struct sock *sk)
+static void aead_pull_tsgl(struct sock *sk, size_t used,
+ struct scatterlist *dst)
{
struct alg_sock *ask = alg_sk(sk);
struct aead_ctx *ctx = ask->private;
- struct aead_sg_list *sgl = &ctx->tsgl;
- struct scatterlist *sg = sgl->sg;
+ struct aead_tsgl *sgl;
+ struct scatterlist *sg;
unsigned int i;
- for (i = 0; i < sgl->cur; i++) {
- if (!sg_page(sg + i))
+ while (!list_empty(&ctx->tsgl_list)) {
+ sgl = list_first_entry(&ctx->tsgl_list, struct aead_tsgl,
+ list);
+ sg = sgl->sg;
+
+ for (i = 0; i < sgl->cur; i++) {
+ size_t plen = min_t(size_t, used, sg[i].length);
+ struct page *page = sg_page(sg + i);
+
+ if (!page)
+ continue;
+
+ /*
+ * Assumption: caller created aead_count_tsgl(len)
+ * SG entries in dst.
+ */
+ if (dst)
+ sg_set_page(dst + i, page, plen, sg[i].offset);
+
+ sg[i].length -= plen;
+ sg[i].offset += plen;
+
+ used -= plen;
+ ctx->used -= plen;
+
+ if (sg[i].length)
+ return;
+
+ if (!dst)
+ put_page(page);
+ sg_assign_page(sg + i, NULL);
+ }
+
+ list_del(&sgl->list);
+ sock_kfree_s(sk, sgl, sizeof(*sgl) + sizeof(sgl->sg[0]) *
+ (MAX_SGL_ENTS + 1));
+ }
+
+ if (!ctx->used)
+ ctx->merge = 0;
+}
+
+static void aead_free_areq_sgls(struct aead_async_req *areq)
+{
+ struct sock *sk = areq->sk;
+ struct alg_sock *ask = alg_sk(sk);
+ struct aead_ctx *ctx = ask->private;
+ struct aead_rsgl *rsgl, *tmp;
+ struct scatterlist *tsgl;
+ struct scatterlist *sg;
+ unsigned int i;
+
+ list_for_each_entry_safe(rsgl, tmp, &areq->rsgl_list, list) {
+ ctx->rcvused -= rsgl->sg_num_bytes;
+ af_alg_free_sg(&rsgl->sgl);
+ list_del(&rsgl->list);
+ if (rsgl != &areq->first_rsgl)
+ sock_kfree_s(sk, rsgl, sizeof(*rsgl));
+ }
+
+ tsgl = areq->tsgl;
+ for_each_sg(tsgl, sg, areq->tsgl_entries, i) {
+ if (!sg_page(sg))
continue;
+ put_page(sg_page(sg));
+ }
+
+ if (areq->tsgl && areq->tsgl_entries)
+ sock_kfree_s(sk, tsgl, areq->tsgl_entries * sizeof(*tsgl));
+}
+
+static int aead_wait_for_wmem(struct sock *sk, unsigned int flags)
+{
+ DEFINE_WAIT_FUNC(wait, woken_wake_function);
+ int err = -ERESTARTSYS;
+ long timeout;
+
+ if (flags & MSG_DONTWAIT)
+ return -EAGAIN;
- put_page(sg_page(sg + i));
- sg_assign_page(sg + i, NULL);
+ sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
+
+ add_wait_queue(sk_sleep(sk), &wait);
+ for (;;) {
+ if (signal_pending(current))
+ break;
+ timeout = MAX_SCHEDULE_TIMEOUT;
+ if (sk_wait_event(sk, &timeout, aead_writable(sk), &wait)) {
+ err = 0;
+ break;
+ }
}
- aead_reset_ctx(ctx);
+ remove_wait_queue(sk_sleep(sk), &wait);
+
+ return err;
}
static void aead_wmem_wakeup(struct sock *sk)
return -EAGAIN;
sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
+
add_wait_queue(sk_sleep(sk), &wait);
for (;;) {
if (signal_pending(current))
struct aead_ctx *ctx = ask->private;
struct socket_wq *wq;
- if (ctx->more)
- return;
if (!ctx->used)
return;
{
struct sock *sk = sock->sk;
struct alg_sock *ask = alg_sk(sk);
+ struct sock *psk = ask->parent;
+ struct alg_sock *pask = alg_sk(psk);
struct aead_ctx *ctx = ask->private;
- unsigned ivsize =
- crypto_aead_ivsize(crypto_aead_reqtfm(&ctx->aead_req));
- struct aead_sg_list *sgl = &ctx->tsgl;
+ struct aead_tfm *aeadc = pask->private;
+ struct crypto_aead *tfm = aeadc->aead;
+ unsigned int ivsize = crypto_aead_ivsize(tfm);
+ struct aead_tsgl *sgl;
struct af_alg_control con = {};
long copied = 0;
bool enc = 0;
bool init = 0;
- int err = -EINVAL;
+ int err = 0;
if (msg->msg_controllen) {
err = af_alg_cmsg_send(msg, &con);
}
lock_sock(sk);
- if (!ctx->more && ctx->used)
+ if (!ctx->more && ctx->used) {
+ err = -EINVAL;
goto unlock;
+ }
if (init) {
ctx->enc = enc;
}
while (size) {
+ struct scatterlist *sg;
size_t len = size;
- struct scatterlist *sg = NULL;
+ size_t plen;
/* use the existing memory in an allocated page */
if (ctx->merge) {
+ sgl = list_entry(ctx->tsgl_list.prev,
+ struct aead_tsgl, list);
sg = sgl->sg + sgl->cur - 1;
len = min_t(unsigned long, len,
PAGE_SIZE - sg->offset - sg->length);
}
if (!aead_writable(sk)) {
- /* user space sent too much data */
- aead_put_sgl(sk);
- err = -EMSGSIZE;
- goto unlock;
+ err = aead_wait_for_wmem(sk, msg->msg_flags);
+ if (err)
+ goto unlock;
}
/* allocate a new page */
len = min_t(unsigned long, size, aead_sndbuf(sk));
- while (len) {
- size_t plen = 0;
- if (sgl->cur >= ALG_MAX_PAGES) {
- aead_put_sgl(sk);
- err = -E2BIG;
- goto unlock;
- }
+ err = aead_alloc_tsgl(sk);
+ if (err)
+ goto unlock;
+
+ sgl = list_entry(ctx->tsgl_list.prev, struct aead_tsgl,
+ list);
+ sg = sgl->sg;
+ if (sgl->cur)
+ sg_unmark_end(sg + sgl->cur - 1);
+
+ do {
+ unsigned int i = sgl->cur;
- sg = sgl->sg + sgl->cur;
plen = min_t(size_t, len, PAGE_SIZE);
- sg_assign_page(sg, alloc_page(GFP_KERNEL));
- err = -ENOMEM;
- if (!sg_page(sg))
+ sg_assign_page(sg + i, alloc_page(GFP_KERNEL));
+ if (!sg_page(sg + i)) {
+ err = -ENOMEM;
goto unlock;
+ }
- err = memcpy_from_msg(page_address(sg_page(sg)),
+ err = memcpy_from_msg(page_address(sg_page(sg + i)),
msg, plen);
if (err) {
- __free_page(sg_page(sg));
- sg_assign_page(sg, NULL);
+ __free_page(sg_page(sg + i));
+ sg_assign_page(sg + i, NULL);
goto unlock;
}
- sg->offset = 0;
- sg->length = plen;
+ sg[i].length = plen;
len -= plen;
ctx->used += plen;
copied += plen;
- sgl->cur++;
size -= plen;
- ctx->merge = plen & (PAGE_SIZE - 1);
- }
+ sgl->cur++;
+ } while (len && sgl->cur < MAX_SGL_ENTS);
+
+ if (!size)
+ sg_mark_end(sg + sgl->cur - 1);
+
+ ctx->merge = plen & (PAGE_SIZE - 1);
}
err = 0;
ctx->more = msg->msg_flags & MSG_MORE;
- if (!ctx->more && !aead_sufficient_data(ctx)) {
- aead_put_sgl(sk);
- err = -EMSGSIZE;
- }
unlock:
aead_data_wakeup(sk);
struct sock *sk = sock->sk;
struct alg_sock *ask = alg_sk(sk);
struct aead_ctx *ctx = ask->private;
- struct aead_sg_list *sgl = &ctx->tsgl;
+ struct aead_tsgl *sgl;
int err = -EINVAL;
if (flags & MSG_SENDPAGE_NOTLAST)
flags |= MSG_MORE;
- if (sgl->cur >= ALG_MAX_PAGES)
- return -E2BIG;
-
lock_sock(sk);
if (!ctx->more && ctx->used)
goto unlock;
goto done;
if (!aead_writable(sk)) {
- /* user space sent too much data */
- aead_put_sgl(sk);
- err = -EMSGSIZE;
- goto unlock;
+ err = aead_wait_for_wmem(sk, flags);
+ if (err)
+ goto unlock;
}
+ err = aead_alloc_tsgl(sk);
+ if (err)
+ goto unlock;
+
ctx->merge = 0;
+ sgl = list_entry(ctx->tsgl_list.prev, struct aead_tsgl, list);
+
+ if (sgl->cur)
+ sg_unmark_end(sgl->sg + sgl->cur - 1);
+
+ sg_mark_end(sgl->sg + sgl->cur);
get_page(page);
sg_set_page(sgl->sg + sgl->cur, page, size, offset);
done:
ctx->more = flags & MSG_MORE;
- if (!ctx->more && !aead_sufficient_data(ctx)) {
- aead_put_sgl(sk);
- err = -EMSGSIZE;
- }
-
unlock:
aead_data_wakeup(sk);
release_sock(sk);
return err ?: size;
}
-#define GET_ASYM_REQ(req, tfm) (struct aead_async_req *) \
- ((char *)req + sizeof(struct aead_request) + \
- crypto_aead_reqsize(tfm))
-
- #define GET_REQ_SIZE(tfm) sizeof(struct aead_async_req) + \
- crypto_aead_reqsize(tfm) + crypto_aead_ivsize(tfm) + \
- sizeof(struct aead_request)
-
static void aead_async_cb(struct crypto_async_request *_req, int err)
{
- struct aead_request *req = _req->data;
- struct crypto_aead *tfm = crypto_aead_reqtfm(req);
- struct aead_async_req *areq = GET_ASYM_REQ(req, tfm);
+ struct aead_async_req *areq = _req->data;
struct sock *sk = areq->sk;
- struct scatterlist *sg = areq->tsgl;
- struct aead_async_rsgl *rsgl;
struct kiocb *iocb = areq->iocb;
- unsigned int i, reqlen = GET_REQ_SIZE(tfm);
-
- list_for_each_entry(rsgl, &areq->list, list) {
- af_alg_free_sg(&rsgl->sgl);
- if (rsgl != &areq->first_rsgl)
- sock_kfree_s(sk, rsgl, sizeof(*rsgl));
- }
-
- for (i = 0; i < areq->tsgls; i++)
- put_page(sg_page(sg + i));
-
- sock_kfree_s(sk, areq->tsgl, sizeof(*areq->tsgl) * areq->tsgls);
- sock_kfree_s(sk, req, reqlen);
- __sock_put(sk);
- iocb->ki_complete(iocb, err, err);
-}
-
-static int aead_recvmsg_async(struct socket *sock, struct msghdr *msg,
- int flags)
-{
- struct sock *sk = sock->sk;
- struct alg_sock *ask = alg_sk(sk);
- struct aead_ctx *ctx = ask->private;
- struct crypto_aead *tfm = crypto_aead_reqtfm(&ctx->aead_req);
- struct aead_async_req *areq;
- struct aead_request *req = NULL;
- struct aead_sg_list *sgl = &ctx->tsgl;
- struct aead_async_rsgl *last_rsgl = NULL, *rsgl;
- unsigned int as = crypto_aead_authsize(tfm);
- unsigned int i, reqlen = GET_REQ_SIZE(tfm);
- int err = -ENOMEM;
- unsigned long used;
- size_t outlen = 0;
- size_t usedpages = 0;
+ unsigned int resultlen;
lock_sock(sk);
- if (ctx->more) {
- err = aead_wait_for_data(sk, flags);
- if (err)
- goto unlock;
- }
-
- if (!aead_sufficient_data(ctx))
- goto unlock;
-
- used = ctx->used;
- if (ctx->enc)
- outlen = used + as;
- else
- outlen = used - as;
-
- req = sock_kmalloc(sk, reqlen, GFP_KERNEL);
- if (unlikely(!req))
- goto unlock;
-
- areq = GET_ASYM_REQ(req, tfm);
- memset(&areq->first_rsgl, '\0', sizeof(areq->first_rsgl));
- INIT_LIST_HEAD(&areq->list);
- areq->iocb = msg->msg_iocb;
- areq->sk = sk;
- memcpy(areq->iv, ctx->iv, crypto_aead_ivsize(tfm));
- aead_request_set_tfm(req, tfm);
- aead_request_set_ad(req, ctx->aead_assoclen);
- aead_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG,
- aead_async_cb, req);
- used -= ctx->aead_assoclen;
-
- /* take over all tx sgls from ctx */
- areq->tsgl = sock_kmalloc(sk,
- sizeof(*areq->tsgl) * max_t(u32, sgl->cur, 1),
- GFP_KERNEL);
- if (unlikely(!areq->tsgl))
- goto free;
-
- sg_init_table(areq->tsgl, max_t(u32, sgl->cur, 1));
- for (i = 0; i < sgl->cur; i++)
- sg_set_page(&areq->tsgl[i], sg_page(&sgl->sg[i]),
- sgl->sg[i].length, sgl->sg[i].offset);
-
- areq->tsgls = sgl->cur;
-
- /* create rx sgls */
- while (outlen > usedpages && iov_iter_count(&msg->msg_iter)) {
- size_t seglen = min_t(size_t, iov_iter_count(&msg->msg_iter),
- (outlen - usedpages));
-
- if (list_empty(&areq->list)) {
- rsgl = &areq->first_rsgl;
-
- } else {
- rsgl = sock_kmalloc(sk, sizeof(*rsgl), GFP_KERNEL);
- if (unlikely(!rsgl)) {
- err = -ENOMEM;
- goto free;
- }
- }
- rsgl->sgl.npages = 0;
- list_add_tail(&rsgl->list, &areq->list);
-
- /* make one iovec available as scatterlist */
- err = af_alg_make_sg(&rsgl->sgl, &msg->msg_iter, seglen);
- if (err < 0)
- goto free;
-
- usedpages += err;
-
- /* chain the new scatterlist with previous one */
- if (last_rsgl)
- af_alg_link_sg(&last_rsgl->sgl, &rsgl->sgl);
-
- last_rsgl = rsgl;
- iov_iter_advance(&msg->msg_iter, err);
- }
+ /* Buffer size written by crypto operation. */
+ resultlen = areq->outlen;
- /* ensure output buffer is sufficiently large */
- if (usedpages < outlen) {
- err = -EINVAL;
- goto unlock;
- }
+ aead_free_areq_sgls(areq);
+ sock_kfree_s(sk, areq, areq->areqlen);
+ __sock_put(sk);
- aead_request_set_crypt(req, areq->tsgl, areq->first_rsgl.sgl.sg, used,
- areq->iv);
- err = ctx->enc ? crypto_aead_encrypt(req) : crypto_aead_decrypt(req);
- if (err) {
- if (err == -EINPROGRESS) {
- sock_hold(sk);
- err = -EIOCBQUEUED;
- aead_reset_ctx(ctx);
- goto unlock;
- } else if (err == -EBADMSG) {
- aead_put_sgl(sk);
- }
- goto free;
- }
- aead_put_sgl(sk);
+ iocb->ki_complete(iocb, err ? err : resultlen, 0);
-free:
- list_for_each_entry(rsgl, &areq->list, list) {
- af_alg_free_sg(&rsgl->sgl);
- if (rsgl != &areq->first_rsgl)
- sock_kfree_s(sk, rsgl, sizeof(*rsgl));
- }
- if (areq->tsgl)
- sock_kfree_s(sk, areq->tsgl, sizeof(*areq->tsgl) * areq->tsgls);
- if (req)
- sock_kfree_s(sk, req, reqlen);
-unlock:
- aead_wmem_wakeup(sk);
release_sock(sk);
- return err ? err : outlen;
}
-static int aead_recvmsg_sync(struct socket *sock, struct msghdr *msg, int flags)
+static int _aead_recvmsg(struct socket *sock, struct msghdr *msg,
+ size_t ignored, int flags)
{
struct sock *sk = sock->sk;
struct alg_sock *ask = alg_sk(sk);
+ struct sock *psk = ask->parent;
+ struct alg_sock *pask = alg_sk(psk);
struct aead_ctx *ctx = ask->private;
- unsigned as = crypto_aead_authsize(crypto_aead_reqtfm(&ctx->aead_req));
- struct aead_sg_list *sgl = &ctx->tsgl;
- struct aead_async_rsgl *last_rsgl = NULL;
- struct aead_async_rsgl *rsgl, *tmp;
- int err = -EINVAL;
- unsigned long used = 0;
- size_t outlen = 0;
- size_t usedpages = 0;
-
- lock_sock(sk);
+ struct aead_tfm *aeadc = pask->private;
+ struct crypto_aead *tfm = aeadc->aead;
+ unsigned int as = crypto_aead_authsize(tfm);
+ unsigned int areqlen =
+ sizeof(struct aead_async_req) + crypto_aead_reqsize(tfm);
+ struct aead_async_req *areq;
+ struct aead_rsgl *last_rsgl = NULL;
+ int err = 0;
+ size_t used = 0; /* [in] TX bufs to be en/decrypted */
+ size_t outlen = 0; /* [out] RX bufs produced by kernel */
+ size_t usedpages = 0; /* [in] RX bufs to be used from user */
+ size_t processed = 0; /* [in] TX bufs to be consumed */
/*
- * Please see documentation of aead_request_set_crypt for the
- * description of the AEAD memory structure expected from the caller.
+ * Data length provided by caller via sendmsg/sendpage that has not
+ * yet been processed.
*/
-
- if (ctx->more) {
- err = aead_wait_for_data(sk, flags);
- if (err)
- goto unlock;
- }
-
- /* data length provided by caller via sendmsg/sendpage */
used = ctx->used;
/*
* the error message in sendmsg/sendpage and still call recvmsg. This
* check here protects the kernel integrity.
*/
- if (!aead_sufficient_data(ctx))
- goto unlock;
+ if (!aead_sufficient_data(sk))
+ return -EINVAL;
/*
* Calculate the minimum output buffer size holding the result of the
*/
used -= ctx->aead_assoclen;
- /* convert iovecs of output buffers into scatterlists */
- while (outlen > usedpages && iov_iter_count(&msg->msg_iter)) {
- size_t seglen = min_t(size_t, iov_iter_count(&msg->msg_iter),
- (outlen - usedpages));
+ /* Allocate cipher request for current operation. */
+ areq = sock_kmalloc(sk, areqlen, GFP_KERNEL);
+ if (unlikely(!areq))
+ return -ENOMEM;
+ areq->areqlen = areqlen;
+ areq->sk = sk;
+ INIT_LIST_HEAD(&areq->rsgl_list);
+ areq->tsgl = NULL;
+ areq->tsgl_entries = 0;
+
+ /* convert iovecs of output buffers into RX SGL */
+ while (outlen > usedpages && msg_data_left(msg)) {
+ struct aead_rsgl *rsgl;
+ size_t seglen;
+
+ /* limit the amount of readable buffers */
+ if (!aead_readable(sk))
+ break;
- if (list_empty(&ctx->list)) {
- rsgl = &ctx->first_rsgl;
+ if (!ctx->used) {
+ err = aead_wait_for_data(sk, flags);
+ if (err)
+ goto free;
+ }
+
+ seglen = min_t(size_t, (outlen - usedpages),
+ msg_data_left(msg));
+
+ if (list_empty(&areq->rsgl_list)) {
+ rsgl = &areq->first_rsgl;
} else {
rsgl = sock_kmalloc(sk, sizeof(*rsgl), GFP_KERNEL);
if (unlikely(!rsgl)) {
err = -ENOMEM;
- goto unlock;
+ goto free;
}
}
+
rsgl->sgl.npages = 0;
- list_add_tail(&rsgl->list, &ctx->list);
+ list_add_tail(&rsgl->list, &areq->rsgl_list);
/* make one iovec available as scatterlist */
err = af_alg_make_sg(&rsgl->sgl, &msg->msg_iter, seglen);
if (err < 0)
- goto unlock;
- usedpages += err;
+ goto free;
+
/* chain the new scatterlist with previous one */
if (last_rsgl)
af_alg_link_sg(&last_rsgl->sgl, &rsgl->sgl);
last_rsgl = rsgl;
-
+ usedpages += err;
+ ctx->rcvused += err;
+ rsgl->sg_num_bytes = err;
iov_iter_advance(&msg->msg_iter, err);
}
- /* ensure output buffer is sufficiently large */
+ /*
+ * Ensure output buffer is sufficiently large. If the caller provides
+ * less buffer space, only use the relative required input size. This
+ * allows AIO operation where the caller sent all data to be processed
+ * and the AIO operation performs the operation on the different chunks
+ * of the input data.
+ */
if (usedpages < outlen) {
- err = -EINVAL;
- goto unlock;
- }
+ size_t less = outlen - usedpages;
- sg_mark_end(sgl->sg + sgl->cur - 1);
- aead_request_set_crypt(&ctx->aead_req, sgl->sg, ctx->first_rsgl.sgl.sg,
- used, ctx->iv);
- aead_request_set_ad(&ctx->aead_req, ctx->aead_assoclen);
+ if (used < less) {
+ err = -EINVAL;
+ goto free;
+ }
+ used -= less;
+ outlen -= less;
+ }
- err = af_alg_wait_for_completion(ctx->enc ?
- crypto_aead_encrypt(&ctx->aead_req) :
- crypto_aead_decrypt(&ctx->aead_req),
+ /*
+ * Create a per request TX SGL for this request which tracks the
+ * SG entries from the global TX SGL.
+ */
+ processed = used + ctx->aead_assoclen;
+ areq->tsgl_entries = aead_count_tsgl(sk, processed);
+ if (!areq->tsgl_entries)
+ areq->tsgl_entries = 1;
+ areq->tsgl = sock_kmalloc(sk, sizeof(*areq->tsgl) * areq->tsgl_entries,
+ GFP_KERNEL);
+ if (!areq->tsgl) {
+ err = -ENOMEM;
+ goto free;
+ }
+ sg_init_table(areq->tsgl, areq->tsgl_entries);
+ aead_pull_tsgl(sk, processed, areq->tsgl);
+
+ /* Initialize the crypto operation */
+ aead_request_set_crypt(&areq->aead_req, areq->tsgl,
+ areq->first_rsgl.sgl.sg, used, ctx->iv);
+ aead_request_set_ad(&areq->aead_req, ctx->aead_assoclen);
+ aead_request_set_tfm(&areq->aead_req, tfm);
+
+ if (msg->msg_iocb && !is_sync_kiocb(msg->msg_iocb)) {
+ /* AIO operation */
+ areq->iocb = msg->msg_iocb;
+ aead_request_set_callback(&areq->aead_req,
+ CRYPTO_TFM_REQ_MAY_BACKLOG,
+ aead_async_cb, areq);
+ err = ctx->enc ? crypto_aead_encrypt(&areq->aead_req) :
+ crypto_aead_decrypt(&areq->aead_req);
+ } else {
+ /* Synchronous operation */
+ aead_request_set_callback(&areq->aead_req,
+ CRYPTO_TFM_REQ_MAY_BACKLOG,
+ af_alg_complete, &ctx->completion);
+ err = af_alg_wait_for_completion(ctx->enc ?
+ crypto_aead_encrypt(&areq->aead_req) :
+ crypto_aead_decrypt(&areq->aead_req),
&ctx->completion);
-
- if (err) {
- /* EBADMSG implies a valid cipher operation took place */
- if (err == -EBADMSG)
- aead_put_sgl(sk);
-
- goto unlock;
}
- aead_put_sgl(sk);
- err = 0;
+ /* AIO operation in progress */
+ if (err == -EINPROGRESS) {
+ sock_hold(sk);
-unlock:
- list_for_each_entry_safe(rsgl, tmp, &ctx->list, list) {
- af_alg_free_sg(&rsgl->sgl);
- list_del(&rsgl->list);
- if (rsgl != &ctx->first_rsgl)
- sock_kfree_s(sk, rsgl, sizeof(*rsgl));
+ /* Remember output size that will be generated. */
+ areq->outlen = outlen;
+
+ return -EIOCBQUEUED;
}
- INIT_LIST_HEAD(&ctx->list);
- aead_wmem_wakeup(sk);
- release_sock(sk);
+
+free:
+ aead_free_areq_sgls(areq);
+ if (areq)
+ sock_kfree_s(sk, areq, areqlen);
return err ? err : outlen;
}
-static int aead_recvmsg(struct socket *sock, struct msghdr *msg, size_t ignored,
- int flags)
+static int aead_recvmsg(struct socket *sock, struct msghdr *msg,
+ size_t ignored, int flags)
{
- return (msg->msg_iocb && !is_sync_kiocb(msg->msg_iocb)) ?
- aead_recvmsg_async(sock, msg, flags) :
- aead_recvmsg_sync(sock, msg, flags);
+ struct sock *sk = sock->sk;
+ int ret = 0;
+
+ lock_sock(sk);
+ while (msg_data_left(msg)) {
+ int err = _aead_recvmsg(sock, msg, ignored, flags);
+
+ /*
+ * This error covers -EIOCBQUEUED which implies that we can
+ * only handle one AIO request. If the caller wants to have
+ * multiple AIO requests in parallel, he must make multiple
+ * separate AIO calls.
+ */
+ if (err <= 0) {
+ if (err == -EIOCBQUEUED || err == -EBADMSG)
+ ret = err;
+ goto out;
+ }
+
+ ret += err;
+ }
+
+out:
+ aead_wmem_wakeup(sk);
+ release_sock(sk);
+ return ret;
}
static unsigned int aead_poll(struct file *file, struct socket *sock,
{
struct alg_sock *ask = alg_sk(sk);
struct aead_ctx *ctx = ask->private;
- unsigned int ivlen = crypto_aead_ivsize(
- crypto_aead_reqtfm(&ctx->aead_req));
+ struct sock *psk = ask->parent;
+ struct alg_sock *pask = alg_sk(psk);
+ struct aead_tfm *aeadc = pask->private;
+ struct crypto_aead *tfm = aeadc->aead;
+ unsigned int ivlen = crypto_aead_ivsize(tfm);
- WARN_ON(refcount_read(&sk->sk_refcnt) != 0);
- aead_put_sgl(sk);
+ aead_pull_tsgl(sk, ctx->used, NULL);
sock_kzfree_s(sk, ctx->iv, ivlen);
sock_kfree_s(sk, ctx, ctx->len);
af_alg_release_parent(sk);
struct alg_sock *ask = alg_sk(sk);
struct aead_tfm *tfm = private;
struct crypto_aead *aead = tfm->aead;
- unsigned int len = sizeof(*ctx) + crypto_aead_reqsize(aead);
+ unsigned int len = sizeof(*ctx);
unsigned int ivlen = crypto_aead_ivsize(aead);
ctx = sock_kmalloc(sk, len, GFP_KERNEL);
}
memset(ctx->iv, 0, ivlen);
+ INIT_LIST_HEAD(&ctx->tsgl_list);
ctx->len = len;
ctx->used = 0;
+ ctx->rcvused = 0;
ctx->more = 0;
ctx->merge = 0;
ctx->enc = 0;
- ctx->tsgl.cur = 0;
ctx->aead_assoclen = 0;
af_alg_init_completion(&ctx->completion);
- sg_init_table(ctx->tsgl.sg, ALG_MAX_PAGES);
- INIT_LIST_HEAD(&ctx->list);
ask->private = ctx;
- aead_request_set_tfm(&ctx->aead_req, aead);
- aead_request_set_callback(&ctx->aead_req, CRYPTO_TFM_REQ_MAY_BACKLOG,
- af_alg_complete, &ctx->completion);
-
sk->sk_destruct = aead_sock_destruct;
return 0;
projects / mirror_ubuntu-focal-kernel.git / commitdiff