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authorDavid Howells <dhowells@redhat.com>2020-09-18 00:23:38 +0200
committerDavid Howells <dhowells@redhat.com>2020-11-23 19:09:30 +0100
commitf4bdf3d683183d2d9f06c9f165fa48bb854988a4 (patch)
treee72130840b5544e094211828441f3ef559a71105 /net/rxrpc/rxkad.c
parentrxrpc: Merge prime_packet_security into init_connection_security (diff)
downloadlinux-f4bdf3d683183d2d9f06c9f165fa48bb854988a4.tar.xz
linux-f4bdf3d683183d2d9f06c9f165fa48bb854988a4.zip
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: David Howells <dhowells@redhat.com>
Diffstat (limited to 'net/rxrpc/rxkad.c')
-rw-r--r--net/rxrpc/rxkad.c24
1 files changed, 9 insertions, 15 deletions
diff --git a/net/rxrpc/rxkad.c b/net/rxrpc/rxkad.c
index 301894857473..37335d887570 100644
--- a/net/rxrpc/rxkad.c
+++ b/net/rxrpc/rxkad.c
@@ -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;