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Diffstat (limited to 'crypto/seqiv.c')
-rw-r--r--crypto/seqiv.c225
1 files changed, 158 insertions, 67 deletions
diff --git a/crypto/seqiv.c b/crypto/seqiv.c
index 2680e94b00f5..16738c5f62bd 100644
--- a/crypto/seqiv.c
+++ b/crypto/seqiv.c
@@ -26,6 +26,11 @@
#include <linux/spinlock.h>
#include <linux/string.h>
+struct seqniv_request_ctx {
+ struct scatterlist dst[2];
+ struct aead_request subreq;
+};
+
struct seqiv_ctx {
spinlock_t lock;
u8 salt[] __attribute__ ((aligned(__alignof__(u32))));
@@ -135,6 +140,50 @@ static void seqiv_aead_encrypt_complete(struct crypto_async_request *base,
aead_request_complete(req, err);
}
+static void seqniv_aead_encrypt_complete2(struct aead_request *req, int err)
+{
+ unsigned int ivsize = 8;
+ u8 data[20];
+
+ if (err == -EINPROGRESS)
+ return;
+
+ /* Swap IV and ESP header back to correct order. */
+ scatterwalk_map_and_copy(data, req->dst, 0, req->assoclen + ivsize, 0);
+ scatterwalk_map_and_copy(data + ivsize, req->dst, 0, req->assoclen, 1);
+ scatterwalk_map_and_copy(data, req->dst, req->assoclen, ivsize, 1);
+}
+
+static void seqniv_aead_encrypt_complete(struct crypto_async_request *base,
+ int err)
+{
+ struct aead_request *req = base->data;
+
+ seqniv_aead_encrypt_complete2(req, err);
+ aead_request_complete(req, err);
+}
+
+static void seqniv_aead_decrypt_complete2(struct aead_request *req, int err)
+{
+ u8 data[4];
+
+ if (err == -EINPROGRESS)
+ return;
+
+ /* Move ESP header back to correct location. */
+ scatterwalk_map_and_copy(data, req->dst, 16, req->assoclen - 8, 0);
+ scatterwalk_map_and_copy(data, req->dst, 8, req->assoclen - 8, 1);
+}
+
+static void seqniv_aead_decrypt_complete(struct crypto_async_request *base,
+ int err)
+{
+ struct aead_request *req = base->data;
+
+ seqniv_aead_decrypt_complete2(req, err);
+ aead_request_complete(req, err);
+}
+
static void seqiv_geniv(struct seqiv_ctx *ctx, u8 *info, u64 seq,
unsigned int ivsize)
{
@@ -244,45 +293,62 @@ static int seqiv_aead_encrypt_compat(struct aead_request *req)
{
struct crypto_aead *geniv = crypto_aead_reqtfm(req);
struct seqiv_aead_ctx *ctx = crypto_aead_ctx(geniv);
- struct aead_request *subreq = aead_request_ctx(req);
+ struct seqniv_request_ctx *rctx = aead_request_ctx(req);
+ struct aead_request *subreq = &rctx->subreq;
+ struct scatterlist *dst;
crypto_completion_t compl;
void *data;
- u8 *info;
- unsigned int ivsize;
+ unsigned int ivsize = 8;
+ u8 buf[20] __attribute__ ((aligned(__alignof__(u32))));
int err;
- aead_request_set_tfm(subreq, ctx->child);
+ if (req->cryptlen < ivsize)
+ return -EINVAL;
- compl = req->base.complete;
- data = req->base.data;
- info = req->iv;
+ /* ESP AD is at most 12 bytes (ESN). */
+ if (req->assoclen > 12)
+ return -EINVAL;
- ivsize = crypto_aead_ivsize(geniv);
+ aead_request_set_tfm(subreq, ctx->child);
- if (unlikely(!IS_ALIGNED((unsigned long)info,
- crypto_aead_alignmask(geniv) + 1))) {
- info = kmalloc(ivsize, req->base.flags &
- CRYPTO_TFM_REQ_MAY_SLEEP ? GFP_KERNEL:
- GFP_ATOMIC);
- if (!info)
- return -ENOMEM;
+ compl = seqniv_aead_encrypt_complete;
+ data = req;
- memcpy(info, req->iv, ivsize);
- compl = seqiv_aead_encrypt_complete;
- data = req;
+ if (req->src != req->dst) {
+ struct scatterlist srcbuf[2];
+ struct scatterlist dstbuf[2];
+ struct blkcipher_desc desc = {
+ .tfm = ctx->null,
+ };
+
+ err = crypto_blkcipher_encrypt(
+ &desc,
+ scatterwalk_ffwd(dstbuf, req->dst,
+ req->assoclen + ivsize),
+ scatterwalk_ffwd(srcbuf, req->src,
+ req->assoclen + ivsize),
+ req->cryptlen - ivsize);
+ if (err)
+ return err;
}
+ dst = scatterwalk_ffwd(rctx->dst, req->dst, ivsize);
+
aead_request_set_callback(subreq, req->base.flags, compl, data);
- aead_request_set_crypt(subreq, req->src, req->dst,
- req->cryptlen - ivsize, info);
- aead_request_set_ad(subreq, req->assoclen, ivsize);
+ aead_request_set_crypt(subreq, dst, dst,
+ req->cryptlen - ivsize, req->iv);
+ aead_request_set_ad(subreq, req->assoclen, 0);
- crypto_xor(info, ctx->salt, ivsize);
- scatterwalk_map_and_copy(info, req->dst, req->assoclen, ivsize, 1);
+ memcpy(buf, req->iv, ivsize);
+ crypto_xor(buf, ctx->salt, ivsize);
+ memcpy(req->iv, buf, ivsize);
+
+ /* Swap order of IV and ESP AD for ICV generation. */
+ scatterwalk_map_and_copy(buf + ivsize, req->dst, 0, req->assoclen, 0);
+ scatterwalk_map_and_copy(buf, req->dst, 0, req->assoclen + ivsize, 1);
err = crypto_aead_encrypt(subreq);
- if (unlikely(info != req->iv))
- seqiv_aead_encrypt_complete2(req, err);
+ seqniv_aead_encrypt_complete2(req, err);
return err;
}
@@ -294,17 +360,18 @@ static int seqiv_aead_encrypt(struct aead_request *req)
crypto_completion_t compl;
void *data;
u8 *info;
- unsigned int ivsize;
+ unsigned int ivsize = 8;
int err;
+ if (req->cryptlen < ivsize)
+ return -EINVAL;
+
aead_request_set_tfm(subreq, ctx->child);
compl = req->base.complete;
data = req->base.data;
info = req->iv;
- ivsize = crypto_aead_ivsize(geniv);
-
if (req->src != req->dst) {
struct scatterlist src[2];
struct scatterlist dst[2];
@@ -354,26 +421,64 @@ static int seqiv_aead_decrypt_compat(struct aead_request *req)
{
struct crypto_aead *geniv = crypto_aead_reqtfm(req);
struct seqiv_aead_ctx *ctx = crypto_aead_ctx(geniv);
- struct aead_request *subreq = aead_request_ctx(req);
+ struct seqniv_request_ctx *rctx = aead_request_ctx(req);
+ struct aead_request *subreq = &rctx->subreq;
+ struct scatterlist *dst;
crypto_completion_t compl;
void *data;
- unsigned int ivsize;
+ unsigned int ivsize = 8;
+ u8 buf[20];
+ int err;
+
+ if (req->cryptlen < ivsize + crypto_aead_authsize(geniv))
+ return -EINVAL;
aead_request_set_tfm(subreq, ctx->child);
compl = req->base.complete;
data = req->base.data;
- ivsize = crypto_aead_ivsize(geniv);
+ if (req->assoclen > 12)
+ return -EINVAL;
+ else if (req->assoclen > 8) {
+ compl = seqniv_aead_decrypt_complete;
+ data = req;
+ }
+
+ if (req->src != req->dst) {
+ struct scatterlist srcbuf[2];
+ struct scatterlist dstbuf[2];
+ struct blkcipher_desc desc = {
+ .tfm = ctx->null,
+ };
+
+ err = crypto_blkcipher_encrypt(
+ &desc,
+ scatterwalk_ffwd(dstbuf, req->dst,
+ req->assoclen + ivsize),
+ scatterwalk_ffwd(srcbuf, req->src,
+ req->assoclen + ivsize),
+ req->cryptlen - ivsize);
+ if (err)
+ return err;
+ }
+
+ /* Move ESP AD forward for ICV generation. */
+ scatterwalk_map_and_copy(buf, req->dst, 0, req->assoclen + ivsize, 0);
+ memcpy(req->iv, buf + req->assoclen, ivsize);
+ scatterwalk_map_and_copy(buf, req->dst, ivsize, req->assoclen, 1);
+
+ dst = scatterwalk_ffwd(rctx->dst, req->dst, ivsize);
aead_request_set_callback(subreq, req->base.flags, compl, data);
- aead_request_set_crypt(subreq, req->src, req->dst,
+ aead_request_set_crypt(subreq, dst, dst,
req->cryptlen - ivsize, req->iv);
- aead_request_set_ad(subreq, req->assoclen, ivsize);
+ aead_request_set_ad(subreq, req->assoclen, 0);
- scatterwalk_map_and_copy(req->iv, req->src, req->assoclen, ivsize, 0);
-
- return crypto_aead_decrypt(subreq);
+ err = crypto_aead_decrypt(subreq);
+ if (req->assoclen > 8)
+ seqniv_aead_decrypt_complete2(req, err);
+ return err;
}
static int seqiv_aead_decrypt(struct aead_request *req)
@@ -383,15 +488,16 @@ static int seqiv_aead_decrypt(struct aead_request *req)
struct aead_request *subreq = aead_request_ctx(req);
crypto_completion_t compl;
void *data;
- unsigned int ivsize;
+ unsigned int ivsize = 8;
+
+ if (req->cryptlen < ivsize + crypto_aead_authsize(geniv))
+ return -EINVAL;
aead_request_set_tfm(subreq, ctx->child);
compl = req->base.complete;
data = req->base.data;
- ivsize = crypto_aead_ivsize(geniv);
-
aead_request_set_callback(subreq, req->base.flags, compl, data);
aead_request_set_crypt(subreq, req->src, req->dst,
req->cryptlen - ivsize, req->iv);
@@ -522,25 +628,7 @@ static int seqiv_old_aead_init(struct crypto_tfm *tfm)
return aead_geniv_init(tfm);
}
-static int seqiv_aead_compat_init(struct crypto_tfm *tfm)
-{
- struct crypto_aead *geniv = __crypto_aead_cast(tfm);
- struct seqiv_aead_ctx *ctx = crypto_aead_ctx(geniv);
- int err;
-
- spin_lock_init(&ctx->lock);
-
- crypto_aead_set_reqsize(geniv, sizeof(struct aead_request));
-
- err = aead_geniv_init(tfm);
-
- ctx->child = geniv->child;
- geniv->child = geniv;
-
- return err;
-}
-
-static int seqiv_aead_init(struct crypto_tfm *tfm)
+static int seqiv_aead_init_common(struct crypto_tfm *tfm, unsigned int reqsize)
{
struct crypto_aead *geniv = __crypto_aead_cast(tfm);
struct seqiv_aead_ctx *ctx = crypto_aead_ctx(geniv);
@@ -570,11 +658,14 @@ drop_null:
goto out;
}
-static void seqiv_aead_compat_exit(struct crypto_tfm *tfm)
+static int seqiv_aead_init(struct crypto_tfm *tfm)
{
- struct seqiv_aead_ctx *ctx = crypto_tfm_ctx(tfm);
+ return seqiv_aead_init_common(tfm, sizeof(struct aead_request));
+}
- crypto_free_aead(ctx->child);
+static int seqniv_aead_init(struct crypto_tfm *tfm)
+{
+ return seqiv_aead_init_common(tfm, sizeof(struct seqniv_request_ctx));
}
static void seqiv_aead_exit(struct crypto_tfm *tfm)
@@ -669,7 +760,7 @@ static int seqiv_aead_create(struct crypto_template *tmpl, struct rtattr **tb)
return seqiv_old_aead_create(tmpl, inst);
err = -EINVAL;
- if (inst->alg.ivsize < sizeof(u64))
+ if (inst->alg.ivsize != sizeof(u64))
goto free_inst;
spawn = aead_instance_ctx(inst);
@@ -690,8 +781,8 @@ static int seqiv_aead_create(struct crypto_template *tmpl, struct rtattr **tb)
inst->alg.encrypt = seqiv_aead_encrypt_compat_first;
inst->alg.decrypt = seqiv_aead_decrypt_compat;
- inst->alg.base.cra_init = seqiv_aead_compat_init;
- inst->alg.base.cra_exit = seqiv_aead_compat_exit;
+ inst->alg.base.cra_init = seqniv_aead_init;
+ inst->alg.base.cra_exit = seqiv_aead_exit;
}
err = aead_register_instance(tmpl, inst);
@@ -747,7 +838,7 @@ static int seqniv_create(struct crypto_template *tmpl, struct rtattr **tb)
goto put_rng;
err = -EINVAL;
- if (inst->alg.ivsize < sizeof(u64))
+ if (inst->alg.ivsize != sizeof(u64))
goto free_inst;
spawn = aead_instance_ctx(inst);
@@ -758,8 +849,8 @@ static int seqniv_create(struct crypto_template *tmpl, struct rtattr **tb)
inst->alg.encrypt = seqiv_aead_encrypt_compat_first;
inst->alg.decrypt = seqiv_aead_decrypt_compat;
- inst->alg.base.cra_init = seqiv_aead_compat_init;
- inst->alg.base.cra_exit = seqiv_aead_compat_exit;
+ inst->alg.base.cra_init = seqniv_aead_init;
+ inst->alg.base.cra_exit = seqiv_aead_exit;
inst->alg.base.cra_alignmask |= __alignof__(u32) - 1;
inst->alg.base.cra_ctxsize = sizeof(struct seqiv_aead_ctx);
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-04 02:16:57 +0000