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Diffstat (limited to 'net/rxrpc/rxkad.c')
-rw-r--r--net/rxrpc/rxkad.c103
1 files changed, 84 insertions, 19 deletions
diff --git a/net/rxrpc/rxkad.c b/net/rxrpc/rxkad.c
index c60c520fde7c..8d8aa3c230b5 100644
--- a/net/rxrpc/rxkad.c
+++ b/net/rxrpc/rxkad.c
@@ -43,6 +43,7 @@ struct rxkad_level2_hdr {
* packets
*/
static struct crypto_sync_skcipher *rxkad_ci;
+static struct skcipher_request *rxkad_ci_req;
static DEFINE_MUTEX(rxkad_ci_mutex);
/*
@@ -99,8 +100,8 @@ error:
*/
static int rxkad_prime_packet_security(struct rxrpc_connection *conn)
{
+ struct skcipher_request *req;
struct rxrpc_key_token *token;
- SYNC_SKCIPHER_REQUEST_ON_STACK(req, conn->cipher);
struct scatterlist sg;
struct rxrpc_crypt iv;
__be32 *tmpbuf;
@@ -115,6 +116,12 @@ static int rxkad_prime_packet_security(struct rxrpc_connection *conn)
if (!tmpbuf)
return -ENOMEM;
+ req = skcipher_request_alloc(&conn->cipher->base, GFP_NOFS);
+ if (!req) {
+ kfree(tmpbuf);
+ return -ENOMEM;
+ }
+
token = conn->params.key->payload.data[0];
memcpy(&iv, token->kad->session_key, sizeof(iv));
@@ -128,7 +135,7 @@ static int rxkad_prime_packet_security(struct rxrpc_connection *conn)
skcipher_request_set_callback(req, 0, NULL, NULL);
skcipher_request_set_crypt(req, &sg, &sg, tmpsize, iv.x);
crypto_skcipher_encrypt(req);
- skcipher_request_zero(req);
+ skcipher_request_free(req);
memcpy(&conn->csum_iv, tmpbuf + 2, sizeof(conn->csum_iv));
kfree(tmpbuf);
@@ -137,6 +144,35 @@ static int rxkad_prime_packet_security(struct rxrpc_connection *conn)
}
/*
+ * Allocate and prepare the crypto request on a call. For any particular call,
+ * this is called serially for the packets, so no lock should be necessary.
+ */
+static struct skcipher_request *rxkad_get_call_crypto(struct rxrpc_call *call)
+{
+ struct crypto_skcipher *tfm = &call->conn->cipher->base;
+ struct skcipher_request *cipher_req = call->cipher_req;
+
+ if (!cipher_req) {
+ cipher_req = skcipher_request_alloc(tfm, GFP_NOFS);
+ if (!cipher_req)
+ return NULL;
+ call->cipher_req = cipher_req;
+ }
+
+ return cipher_req;
+}
+
+/*
+ * Clean up the crypto on a call.
+ */
+static void rxkad_free_call_crypto(struct rxrpc_call *call)
+{
+ if (call->cipher_req)
+ skcipher_request_free(call->cipher_req);
+ call->cipher_req = NULL;
+}
+
+/*
* partially encrypt a packet (level 1 security)
*/
static int rxkad_secure_packet_auth(const struct rxrpc_call *call,
@@ -243,7 +279,7 @@ static int rxkad_secure_packet(struct rxrpc_call *call,
void *sechdr)
{
struct rxrpc_skb_priv *sp;
- SYNC_SKCIPHER_REQUEST_ON_STACK(req, call->conn->cipher);
+ struct skcipher_request *req;
struct rxrpc_crypt iv;
struct scatterlist sg;
u32 x, y;
@@ -262,6 +298,10 @@ static int rxkad_secure_packet(struct rxrpc_call *call,
if (ret < 0)
return ret;
+ req = rxkad_get_call_crypto(call);
+ if (!req)
+ return -ENOMEM;
+
/* continue encrypting from where we left off */
memcpy(&iv, call->conn->csum_iv.x, sizeof(iv));
@@ -488,7 +528,7 @@ static int rxkad_verify_packet(struct rxrpc_call *call, struct sk_buff *skb,
unsigned int offset, unsigned int len,
rxrpc_seq_t seq, u16 expected_cksum)
{
- SYNC_SKCIPHER_REQUEST_ON_STACK(req, call->conn->cipher);
+ struct skcipher_request *req;
struct rxrpc_crypt iv;
struct scatterlist sg;
bool aborted;
@@ -501,6 +541,10 @@ static int rxkad_verify_packet(struct rxrpc_call *call, struct sk_buff *skb,
if (!call->conn->cipher)
return 0;
+ req = rxkad_get_call_crypto(call);
+ if (!req)
+ return -ENOMEM;
+
/* continue encrypting from where we left off */
memcpy(&iv, call->conn->csum_iv.x, sizeof(iv));
@@ -733,14 +777,18 @@ static void rxkad_calc_response_checksum(struct rxkad_response *response)
/*
* encrypt the response packet
*/
-static void rxkad_encrypt_response(struct rxrpc_connection *conn,
- struct rxkad_response *resp,
- const struct rxkad_key *s2)
+static int rxkad_encrypt_response(struct rxrpc_connection *conn,
+ struct rxkad_response *resp,
+ const struct rxkad_key *s2)
{
- SYNC_SKCIPHER_REQUEST_ON_STACK(req, conn->cipher);
+ struct skcipher_request *req;
struct rxrpc_crypt iv;
struct scatterlist sg[1];
+ req = skcipher_request_alloc(&conn->cipher->base, GFP_NOFS);
+ if (!req)
+ return -ENOMEM;
+
/* continue encrypting from where we left off */
memcpy(&iv, s2->session_key, sizeof(iv));
@@ -750,7 +798,8 @@ static void rxkad_encrypt_response(struct rxrpc_connection *conn,
skcipher_request_set_callback(req, 0, NULL, NULL);
skcipher_request_set_crypt(req, sg, sg, sizeof(resp->encrypted), iv.x);
crypto_skcipher_encrypt(req);
- skcipher_request_zero(req);
+ skcipher_request_free(req);
+ return 0;
}
/*
@@ -825,8 +874,9 @@ static int rxkad_respond_to_challenge(struct rxrpc_connection *conn,
/* calculate the response checksum and then do the encryption */
rxkad_calc_response_checksum(resp);
- rxkad_encrypt_response(conn, resp, token->kad);
- ret = rxkad_send_response(conn, &sp->hdr, resp, token->kad);
+ ret = rxkad_encrypt_response(conn, resp, token->kad);
+ if (ret == 0)
+ ret = rxkad_send_response(conn, &sp->hdr, resp, token->kad);
kfree(resp);
return ret;
@@ -1003,18 +1053,16 @@ static void rxkad_decrypt_response(struct rxrpc_connection *conn,
struct rxkad_response *resp,
const struct rxrpc_crypt *session_key)
{
- SYNC_SKCIPHER_REQUEST_ON_STACK(req, rxkad_ci);
+ struct skcipher_request *req = rxkad_ci_req;
struct scatterlist sg[1];
struct rxrpc_crypt iv;
_enter(",,%08x%08x",
ntohl(session_key->n[0]), ntohl(session_key->n[1]));
- ASSERT(rxkad_ci != NULL);
-
mutex_lock(&rxkad_ci_mutex);
if (crypto_sync_skcipher_setkey(rxkad_ci, session_key->x,
- sizeof(*session_key)) < 0)
+ sizeof(*session_key)) < 0)
BUG();
memcpy(&iv, session_key, sizeof(iv));
@@ -1208,10 +1256,26 @@ static void rxkad_clear(struct rxrpc_connection *conn)
*/
static int rxkad_init(void)
{
+ struct crypto_sync_skcipher *tfm;
+ struct skcipher_request *req;
+
/* pin the cipher we need so that the crypto layer doesn't invoke
* keventd to go get it */
- rxkad_ci = crypto_alloc_sync_skcipher("pcbc(fcrypt)", 0, 0);
- return PTR_ERR_OR_ZERO(rxkad_ci);
+ tfm = crypto_alloc_sync_skcipher("pcbc(fcrypt)", 0, 0);
+ if (IS_ERR(tfm))
+ return PTR_ERR(tfm);
+
+ req = skcipher_request_alloc(&tfm->base, GFP_KERNEL);
+ if (!req)
+ goto nomem_tfm;
+
+ rxkad_ci_req = req;
+ rxkad_ci = tfm;
+ return 0;
+
+nomem_tfm:
+ crypto_free_sync_skcipher(tfm);
+ return -ENOMEM;
}
/*
@@ -1219,8 +1283,8 @@ static int rxkad_init(void)
*/
static void rxkad_exit(void)
{
- if (rxkad_ci)
- crypto_free_sync_skcipher(rxkad_ci);
+ crypto_free_sync_skcipher(rxkad_ci);
+ skcipher_request_free(rxkad_ci_req);
}
/*
@@ -1235,6 +1299,7 @@ const struct rxrpc_security rxkad = {
.prime_packet_security = rxkad_prime_packet_security,
.secure_packet = rxkad_secure_packet,
.verify_packet = rxkad_verify_packet,
+ .free_call_crypto = rxkad_free_call_crypto,
.locate_data = rxkad_locate_data,
.issue_challenge = rxkad_issue_challenge,
.respond_to_challenge = rxkad_respond_to_challenge,
generated by cgit v1.2.3 (git 2.39.0) at 2024-11-24 11:01:56 +0300