sg_set_page(sg, virt_to_page(buf), buflen, offset_in_page(buf));
}
-/* Assumes:
- * rqst->rq_iov[0] is transform header
- * rqst->rq_iov[1+] data to be encrypted/decrypted
+/* Assumes the first rqst has a transform header as the first iov.
+ * I.e.
+ * rqst[0].rq_iov[0] is transform header
+ * rqst[0].rq_iov[1+] data to be encrypted/decrypted
+ * rqst[1+].rq_iov[0+] data to be encrypted/decrypted
*/
static struct scatterlist *
-init_sg(struct smb_rqst *rqst, u8 *sign)
+init_sg(int num_rqst, struct smb_rqst *rqst, u8 *sign)
{
- unsigned int sg_len = rqst->rq_nvec + rqst->rq_npages + 1;
- unsigned int assoc_data_len = sizeof(struct smb2_transform_hdr) - 20;
+ unsigned int sg_len;
struct scatterlist *sg;
unsigned int i;
unsigned int j;
+ unsigned int idx = 0;
+ int skip;
+
+ sg_len = 1;
+ for (i = 0; i < num_rqst; i++)
+ sg_len += rqst[i].rq_nvec + rqst[i].rq_npages;
sg = kmalloc_array(sg_len, sizeof(struct scatterlist), GFP_KERNEL);
if (!sg)
return NULL;
sg_init_table(sg, sg_len);
- smb2_sg_set_buf(&sg[0], rqst->rq_iov[0].iov_base + 20, assoc_data_len);
- for (i = 1; i < rqst->rq_nvec; i++)
- smb2_sg_set_buf(&sg[i], rqst->rq_iov[i].iov_base,
- rqst->rq_iov[i].iov_len);
- for (j = 0; i < sg_len - 1; i++, j++) {
- unsigned int len, offset;
+ for (i = 0; i < num_rqst; i++) {
+ for (j = 0; j < rqst[i].rq_nvec; j++) {
+ /*
+ * The first rqst has a transform header where the
+ * first 20 bytes are not part of the encrypted blob
+ */
+ skip = (i == 0) && (j == 0) ? 20 : 0;
+ smb2_sg_set_buf(&sg[idx++],
+ rqst[i].rq_iov[j].iov_base + skip,
+ rqst[i].rq_iov[j].iov_len - skip);
+ }
+
+ for (j = 0; j < rqst[i].rq_npages; j++) {
+ unsigned int len, offset;
- rqst_page_get_length(rqst, j, &len, &offset);
- sg_set_page(&sg[i], rqst->rq_pages[j], len, offset);
+ rqst_page_get_length(&rqst[i], j, &len, &offset);
+ sg_set_page(&sg[idx++], rqst[i].rq_pages[j], len, offset);
+ }
}
- smb2_sg_set_buf(&sg[sg_len - 1], sign, SMB2_SIGNATURE_SIZE);
+ smb2_sg_set_buf(&sg[idx], sign, SMB2_SIGNATURE_SIZE);
return sg;
}
* untouched.
*/
static int
-crypt_message(struct TCP_Server_Info *server, struct smb_rqst *rqst, int enc)
+crypt_message(struct TCP_Server_Info *server, int num_rqst,
+ struct smb_rqst *rqst, int enc)
{
struct smb2_transform_hdr *tr_hdr =
- (struct smb2_transform_hdr *)rqst->rq_iov[0].iov_base;
+ (struct smb2_transform_hdr *)rqst[0].rq_iov[0].iov_base;
unsigned int assoc_data_len = sizeof(struct smb2_transform_hdr) - 20;
int rc = 0;
struct scatterlist *sg;
crypt_len += SMB2_SIGNATURE_SIZE;
}
- sg = init_sg(rqst, sign);
+ sg = init_sg(num_rqst, rqst, sign);
if (!sg) {
cifs_dbg(VFS, "%s: Failed to init sg", __func__);
rc = -ENOMEM;
return rc;
}
+void
+smb3_free_compound_rqst(int num_rqst, struct smb_rqst *rqst)
+{
+ int i, j;
+
+ for (i = 0; i < num_rqst; i++) {
+ if (rqst[i].rq_pages) {
+ for (j = rqst[i].rq_npages - 1; j >= 0; j--)
+ put_page(rqst[i].rq_pages[j]);
+ kfree(rqst[i].rq_pages);
+ }
+ }
+}
+
+/*
+ * This function will initialize new_rq and encrypt the content.
+ * The first entry, new_rq[0], only contains a single iov which contains
+ * a smb2_transform_hdr and is pre-allocated by the caller.
+ * This function then populates new_rq[1+] with the content from olq_rq[0+].
+ *
+ * The end result is an array of smb_rqst structures where the first structure
+ * only contains a single iov for the transform header which we then can pass
+ * to crypt_message().
+ *
+ * new_rq[0].rq_iov[0] : smb2_transform_hdr pre-allocated by the caller
+ * new_rq[1+].rq_iov[*] == old_rq[0+].rq_iov[*] : SMB2/3 requests
+ */
static int
-smb3_init_transform_rq(struct TCP_Server_Info *server, struct smb_rqst *new_rq,
- struct smb_rqst *old_rq)
+smb3_init_transform_rq(struct TCP_Server_Info *server, int num_rqst,
+ struct smb_rqst *new_rq, struct smb_rqst *old_rq)
{
- struct kvec *iov;
struct page **pages;
- struct smb2_transform_hdr *tr_hdr;
- unsigned int npages = old_rq->rq_npages;
- unsigned int orig_len;
- int i;
+ struct smb2_transform_hdr *tr_hdr = new_rq[0].rq_iov[0].iov_base;
+ unsigned int npages;
+ unsigned int orig_len = 0;
+ int i, j;
int rc = -ENOMEM;
- pages = kmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
- if (!pages)
- return rc;
-
- new_rq->rq_pages = pages;
- new_rq->rq_offset = old_rq->rq_offset;
- new_rq->rq_npages = old_rq->rq_npages;
- new_rq->rq_pagesz = old_rq->rq_pagesz;
- new_rq->rq_tailsz = old_rq->rq_tailsz;
-
- for (i = 0; i < npages; i++) {
- pages[i] = alloc_page(GFP_KERNEL|__GFP_HIGHMEM);
- if (!pages[i])
- goto err_free_pages;
- }
-
- iov = kmalloc_array(old_rq->rq_nvec + 1, sizeof(struct kvec),
- GFP_KERNEL);
- if (!iov)
- goto err_free_pages;
+ for (i = 1; i < num_rqst; i++) {
+ npages = old_rq[i - 1].rq_npages;
+ pages = kmalloc_array(npages, sizeof(struct page *),
+ GFP_KERNEL);
+ if (!pages)
+ goto err_free;
+
+ new_rq[i].rq_pages = pages;
+ new_rq[i].rq_npages = npages;
+ new_rq[i].rq_offset = old_rq[i - 1].rq_offset;
+ new_rq[i].rq_pagesz = old_rq[i - 1].rq_pagesz;
+ new_rq[i].rq_tailsz = old_rq[i - 1].rq_tailsz;
+ new_rq[i].rq_iov = old_rq[i - 1].rq_iov;
+ new_rq[i].rq_nvec = old_rq[i - 1].rq_nvec;
+
+ orig_len += smb_rqst_len(server, &old_rq[i - 1]);
+
+ for (j = 0; j < npages; j++) {
+ pages[j] = alloc_page(GFP_KERNEL|__GFP_HIGHMEM);
+ if (!pages[j])
+ goto err_free;
+ }
- /* copy all iovs from the old */
- memcpy(&iov[1], &old_rq->rq_iov[0],
- sizeof(struct kvec) * old_rq->rq_nvec);
+ /* copy pages form the old */
+ for (j = 0; j < npages; j++) {
+ char *dst, *src;
+ unsigned int offset, len;
- new_rq->rq_iov = iov;
- new_rq->rq_nvec = old_rq->rq_nvec + 1;
+ rqst_page_get_length(&new_rq[i], j, &len, &offset);
- tr_hdr = kmalloc(sizeof(struct smb2_transform_hdr), GFP_KERNEL);
- if (!tr_hdr)
- goto err_free_iov;
+ dst = (char *) kmap(new_rq[i].rq_pages[j]) + offset;
+ src = (char *) kmap(old_rq[i - 1].rq_pages[j]) + offset;
- orig_len = smb_rqst_len(server, old_rq);
+ memcpy(dst, src, len);
+ kunmap(new_rq[i].rq_pages[j]);
+ kunmap(old_rq[i - 1].rq_pages[j]);
+ }
+ }
- /* fill the 2nd iov with a transform header */
+ /* fill the 1st iov with a transform header */
fill_transform_hdr(tr_hdr, orig_len, old_rq);
- new_rq->rq_iov[0].iov_base = tr_hdr;
- new_rq->rq_iov[0].iov_len = sizeof(struct smb2_transform_hdr);
-
- /* copy pages form the old */
- for (i = 0; i < npages; i++) {
- char *dst, *src;
- unsigned int offset, len;
-
- rqst_page_get_length(new_rq, i, &len, &offset);
- dst = (char *) kmap(new_rq->rq_pages[i]) + offset;
- src = (char *) kmap(old_rq->rq_pages[i]) + offset;
-
- memcpy(dst, src, len);
- kunmap(new_rq->rq_pages[i]);
- kunmap(old_rq->rq_pages[i]);
- }
-
- rc = crypt_message(server, new_rq, 1);
+ rc = crypt_message(server, num_rqst, new_rq, 1);
cifs_dbg(FYI, "encrypt message returned %d", rc);
if (rc)
- goto err_free_tr_hdr;
+ goto err_free;
return rc;
-err_free_tr_hdr:
- kfree(tr_hdr);
-err_free_iov:
- kfree(iov);
-err_free_pages:
- for (i = i - 1; i >= 0; i--)
- put_page(pages[i]);
- kfree(pages);
+err_free:
+ smb3_free_compound_rqst(num_rqst - 1, &new_rq[1]);
return rc;
}
-static void
-smb3_free_transform_rq(struct smb_rqst *rqst)
-{
- int i = rqst->rq_npages - 1;
-
- for (; i >= 0; i--)
- put_page(rqst->rq_pages[i]);
- kfree(rqst->rq_pages);
- /* free transform header */
- kfree(rqst->rq_iov[0].iov_base);
- kfree(rqst->rq_iov);
-}
-
static int
smb3_is_transform_hdr(void *buf)
{
rqst.rq_pagesz = PAGE_SIZE;
rqst.rq_tailsz = (page_data_size % PAGE_SIZE) ? : PAGE_SIZE;
- rc = crypt_message(server, &rqst, 0);
+ rc = crypt_message(server, 1, &rqst, 0);
cifs_dbg(FYI, "decrypt message returned %d\n", rc);
if (rc)
.fallocate = smb3_fallocate,
.enum_snapshots = smb3_enum_snapshots,
.init_transform_rq = smb3_init_transform_rq,
- .free_transform_rq = smb3_free_transform_rq,
.is_transform_hdr = smb3_is_transform_hdr,
.receive_transform = smb3_receive_transform,
.get_dfs_refer = smb2_get_dfs_refer,
.fallocate = smb3_fallocate,
.enum_snapshots = smb3_enum_snapshots,
.init_transform_rq = smb3_init_transform_rq,
- .free_transform_rq = smb3_free_transform_rq,
.is_transform_hdr = smb3_is_transform_hdr,
.receive_transform = smb3_receive_transform,
.get_dfs_refer = smb2_get_dfs_refer,
projects / platform / kernel / linux-rpi.git / commitdiff