Commit f4bdf3d6 authored by David Howells's avatar David Howells
Browse files

rxrpc: Don't reserve security header in Tx DATA skbuff 



Insert the security header into the skbuff representing a DATA packet to be
transmitted rather than using skb_reserve() when the packet is allocated.
This makes it easier to apply crypto that spans the security header and the
data, particularly in the upcoming RxGK class where we have a common
encrypt-and-checksum function that is used in a number of circumstances.

Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
parent 8d47a43c

net/rxrpc/ar-internal.h

+1 −4
Original line number Diff line number Diff line
@@ -236,10 +236,7 @@ struct rxrpc_security { 




	/* impose security on a packet */

	int (*secure_packet)(struct rxrpc_call *,

			     struct sk_buff *,

			     size_t,

			     void *);

	int (*secure_packet)(struct rxrpc_call *, struct sk_buff *, size_t);



	/* verify the security on a received packet */

	int (*verify_packet)(struct rxrpc_call *, struct sk_buff *,

net/rxrpc/insecure.c

+2 −4
Original line number Diff line number Diff line
@@ -14,10 +14,8 @@ static int none_init_connection_security(struct rxrpc_connection *conn, 
	return 0;

}



static int none_secure_packet(struct rxrpc_call *call,

			      struct sk_buff *skb,

			      size_t data_size,

			      void *sechdr)

static int none_secure_packet(struct rxrpc_call *call, struct sk_buff *skb,

			      size_t data_size)

{

	return 0;

}

net/rxrpc/rxkad.c

+9 −15
Original line number Diff line number Diff line
@@ -230,9 +230,7 @@ static void rxkad_free_call_crypto(struct rxrpc_call *call) 
 * partially encrypt a packet (level 1 security)

 */

static int rxkad_secure_packet_auth(const struct rxrpc_call *call,

				    struct sk_buff *skb,

				    u32 data_size,

				    void *sechdr,

				    struct sk_buff *skb, u32 data_size,

				    struct skcipher_request *req)

{

	struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
@@ -247,12 +245,12 @@ static int rxkad_secure_packet_auth(const struct rxrpc_call *call, 
	data_size |= (u32)check << 16;



	hdr.data_size = htonl(data_size);

	memcpy(sechdr, &hdr, sizeof(hdr));

	memcpy(skb->head, &hdr, sizeof(hdr));



	/* start the encryption afresh */

	memset(&iv, 0, sizeof(iv));



	sg_init_one(&sg, sechdr, 8);

	sg_init_one(&sg, skb->head, 8);

	skcipher_request_set_sync_tfm(req, call->conn->cipher);

	skcipher_request_set_callback(req, 0, NULL, NULL);

	skcipher_request_set_crypt(req, &sg, &sg, 8, iv.x);
@@ -269,7 +267,6 @@ static int rxkad_secure_packet_auth(const struct rxrpc_call *call, 
static int rxkad_secure_packet_encrypt(const struct rxrpc_call *call,

				       struct sk_buff *skb,

				       u32 data_size,

				       void *sechdr,

				       struct skcipher_request *req)

{

	const struct rxrpc_key_token *token;
@@ -289,13 +286,13 @@ static int rxkad_secure_packet_encrypt(const struct rxrpc_call *call, 


	rxkhdr.data_size = htonl(data_size | (u32)check << 16);

	rxkhdr.checksum = 0;

	memcpy(sechdr, &rxkhdr, sizeof(rxkhdr));

	memcpy(skb->head, &rxkhdr, sizeof(rxkhdr));



	/* encrypt from the session key */

	token = call->conn->params.key->payload.data[0];

	memcpy(&iv, token->kad->session_key, sizeof(iv));



	sg_init_one(&sg[0], sechdr, sizeof(rxkhdr));

	sg_init_one(&sg[0], skb->head, sizeof(rxkhdr));

	skcipher_request_set_sync_tfm(req, call->conn->cipher);

	skcipher_request_set_callback(req, 0, NULL, NULL);

	skcipher_request_set_crypt(req, &sg[0], &sg[0], sizeof(rxkhdr), iv.x);
@@ -310,7 +307,7 @@ static int rxkad_secure_packet_encrypt(const struct rxrpc_call *call, 
	len &= ~(call->conn->size_align - 1);



	sg_init_table(sg, ARRAY_SIZE(sg));

	err = skb_to_sgvec(skb, sg, 0, len);

	err = skb_to_sgvec(skb, sg, 8, len);

	if (unlikely(err < 0))

		goto out;

	skcipher_request_set_crypt(req, sg, sg, len, iv.x);
@@ -329,8 +326,7 @@ out: 
 */

static int rxkad_secure_packet(struct rxrpc_call *call,

			       struct sk_buff *skb,

			       size_t data_size,

			       void *sechdr)

			       size_t data_size)

{

	struct rxrpc_skb_priv *sp;

	struct skcipher_request	*req;
@@ -383,12 +379,10 @@ static int rxkad_secure_packet(struct rxrpc_call *call, 
		ret = 0;

		break;

	case RXRPC_SECURITY_AUTH:

		ret = rxkad_secure_packet_auth(call, skb, data_size, sechdr,

					       req);

		ret = rxkad_secure_packet_auth(call, skb, data_size, req);

		break;

	case RXRPC_SECURITY_ENCRYPT:

		ret = rxkad_secure_packet_encrypt(call, skb, data_size,

						  sechdr, req);

		ret = rxkad_secure_packet_encrypt(call, skb, data_size, req);

		break;

	default:

		ret = -EPERM;

net/rxrpc/sendmsg.c

+2 −4
Original line number Diff line number Diff line
@@ -372,8 +372,7 @@ static int rxrpc_send_data(struct rxrpc_sock *rx, 
			ASSERTCMP(skb->mark, ==, 0);



			_debug("HS: %u", call->conn->security_size);

			skb_reserve(skb, call->conn->security_size);

			skb->len += call->conn->security_size;

			__skb_put(skb, call->conn->security_size);



			sp->remain = chunk;

			if (sp->remain > skb_tailroom(skb))
@@ -446,8 +445,7 @@ static int rxrpc_send_data(struct rxrpc_sock *rx, 
				 call->tx_winsize)

				sp->hdr.flags |= RXRPC_MORE_PACKETS;



			ret = call->security->secure_packet(

				call, skb, skb->mark, skb->head);

			ret = call->security->secure_packet(call, skb, skb->mark);

			if (ret < 0)

				goto out;

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