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-rw-r--r--net/rxrpc/af_rxrpc.c5
-rw-r--r--net/rxrpc/ar-internal.h3
-rw-r--r--net/rxrpc/call_object.c3
-rw-r--r--net/rxrpc/sendmsg.c54
4 files changed, 61 insertions, 4 deletions
diff --git a/net/rxrpc/af_rxrpc.c b/net/rxrpc/af_rxrpc.c
index 44a52b82bb5d..58ae0db52ea1 100644
--- a/net/rxrpc/af_rxrpc.c
+++ b/net/rxrpc/af_rxrpc.c
@@ -262,6 +262,7 @@ static int rxrpc_listen(struct socket *sock, int backlog)
* @srx: The address of the peer to contact
* @key: The security context to use (defaults to socket setting)
* @user_call_ID: The ID to use
+ * @tx_total_len: Total length of data to transmit during the call (or -1)
* @gfp: The allocation constraints
* @notify_rx: Where to send notifications instead of socket queue
*
@@ -276,6 +277,7 @@ struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *sock,
struct sockaddr_rxrpc *srx,
struct key *key,
unsigned long user_call_ID,
+ s64 tx_total_len,
gfp_t gfp,
rxrpc_notify_rx_t notify_rx)
{
@@ -303,7 +305,8 @@ struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *sock,
cp.security_level = 0;
cp.exclusive = false;
cp.service_id = srx->srx_service;
- call = rxrpc_new_client_call(rx, &cp, srx, user_call_ID, gfp);
+ call = rxrpc_new_client_call(rx, &cp, srx, user_call_ID, tx_total_len,
+ gfp);
/* The socket has been unlocked. */
if (!IS_ERR(call))
call->notify_rx = notify_rx;
diff --git a/net/rxrpc/ar-internal.h b/net/rxrpc/ar-internal.h
index e9b536cb0acf..adbf37946450 100644
--- a/net/rxrpc/ar-internal.h
+++ b/net/rxrpc/ar-internal.h
@@ -528,6 +528,7 @@ struct rxrpc_call {
struct rb_node sock_node; /* Node in rx->calls */
struct sk_buff *tx_pending; /* Tx socket buffer being filled */
wait_queue_head_t waitq; /* Wait queue for channel or Tx */
+ s64 tx_total_len; /* Total length left to be transmitted (or -1) */
__be32 crypto_buf[2]; /* Temporary packet crypto buffer */
unsigned long user_call_ID; /* user-defined call ID */
unsigned long flags;
@@ -683,7 +684,7 @@ struct rxrpc_call *rxrpc_alloc_call(gfp_t);
struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *,
struct rxrpc_conn_parameters *,
struct sockaddr_rxrpc *,
- unsigned long, gfp_t);
+ unsigned long, s64, gfp_t);
void rxrpc_incoming_call(struct rxrpc_sock *, struct rxrpc_call *,
struct sk_buff *);
void rxrpc_release_call(struct rxrpc_sock *, struct rxrpc_call *);
diff --git a/net/rxrpc/call_object.c b/net/rxrpc/call_object.c
index 692110808baa..423030fd93be 100644
--- a/net/rxrpc/call_object.c
+++ b/net/rxrpc/call_object.c
@@ -127,6 +127,7 @@ struct rxrpc_call *rxrpc_alloc_call(gfp_t gfp)
rwlock_init(&call->state_lock);
atomic_set(&call->usage, 1);
call->debug_id = atomic_inc_return(&rxrpc_debug_id);
+ call->tx_total_len = -1;
memset(&call->sock_node, 0xed, sizeof(call->sock_node));
@@ -201,6 +202,7 @@ struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx,
struct rxrpc_conn_parameters *cp,
struct sockaddr_rxrpc *srx,
unsigned long user_call_ID,
+ s64 tx_total_len,
gfp_t gfp)
__releases(&rx->sk.sk_lock.slock)
{
@@ -219,6 +221,7 @@ struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx,
return call;
}
+ call->tx_total_len = tx_total_len;
trace_rxrpc_call(call, rxrpc_call_new_client, atomic_read(&call->usage),
here, (const void *)user_call_ID);
diff --git a/net/rxrpc/sendmsg.c b/net/rxrpc/sendmsg.c
index d939a5b1abc3..2e636a525a65 100644
--- a/net/rxrpc/sendmsg.c
+++ b/net/rxrpc/sendmsg.c
@@ -29,6 +29,7 @@ enum rxrpc_command {
};
struct rxrpc_send_params {
+ s64 tx_total_len; /* Total Tx data length (if send data) */
unsigned long user_call_ID; /* User's call ID */
u32 abort_code; /* Abort code to Tx (if abort) */
enum rxrpc_command command : 8; /* The command to implement */
@@ -207,6 +208,13 @@ static int rxrpc_send_data(struct rxrpc_sock *rx,
more = msg->msg_flags & MSG_MORE;
+ if (call->tx_total_len != -1) {
+ if (len > call->tx_total_len)
+ return -EMSGSIZE;
+ if (!more && len != call->tx_total_len)
+ return -EMSGSIZE;
+ }
+
skb = call->tx_pending;
call->tx_pending = NULL;
rxrpc_see_skb(skb, rxrpc_skb_tx_seen);
@@ -299,6 +307,8 @@ static int rxrpc_send_data(struct rxrpc_sock *rx,
sp->remain -= copy;
skb->mark += copy;
copied += copy;
+ if (call->tx_total_len != -1)
+ call->tx_total_len -= copy;
}
/* check for the far side aborting the call or a network error
@@ -436,6 +446,14 @@ static int rxrpc_sendmsg_cmsg(struct msghdr *msg, struct rxrpc_send_params *p)
return -EINVAL;
break;
+ case RXRPC_TX_LENGTH:
+ if (p->tx_total_len != -1 || len != sizeof(__s64))
+ return -EINVAL;
+ p->tx_total_len = *(__s64 *)CMSG_DATA(cmsg);
+ if (p->tx_total_len < 0)
+ return -EINVAL;
+ break;
+
default:
return -EINVAL;
}
@@ -443,6 +461,8 @@ static int rxrpc_sendmsg_cmsg(struct msghdr *msg, struct rxrpc_send_params *p)
if (!got_user_ID)
return -EINVAL;
+ if (p->tx_total_len != -1 && p->command != RXRPC_CMD_SEND_DATA)
+ return -EINVAL;
_leave(" = 0");
return 0;
}
@@ -481,7 +501,8 @@ rxrpc_new_client_call_for_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg,
cp.exclusive = rx->exclusive | p->exclusive;
cp.upgrade = p->upgrade;
cp.service_id = srx->srx_service;
- call = rxrpc_new_client_call(rx, &cp, srx, p->user_call_ID, GFP_KERNEL);
+ call = rxrpc_new_client_call(rx, &cp, srx, p->user_call_ID,
+ p->tx_total_len, GFP_KERNEL);
/* The socket is now unlocked */
_leave(" = %p\n", call);
@@ -501,6 +522,7 @@ int rxrpc_do_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg, size_t len)
int ret;
struct rxrpc_send_params p = {
+ .tx_total_len = -1,
.user_call_ID = 0,
.abort_code = 0,
.command = RXRPC_CMD_SEND_DATA,
@@ -555,6 +577,15 @@ int rxrpc_do_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg, size_t len)
ret = -ERESTARTSYS;
goto error_put;
}
+
+ if (p.tx_total_len != -1) {
+ ret = -EINVAL;
+ if (call->tx_total_len != -1 ||
+ call->tx_pending ||
+ call->tx_top != 0)
+ goto error_put;
+ call->tx_total_len = p.tx_total_len;
+ }
}
state = READ_ONCE(call->state);
@@ -672,5 +703,24 @@ bool rxrpc_kernel_abort_call(struct socket *sock, struct rxrpc_call *call,
mutex_unlock(&call->user_mutex);
return aborted;
}
-
EXPORT_SYMBOL(rxrpc_kernel_abort_call);
+
+/**
+ * rxrpc_kernel_set_tx_length - Set the total Tx length on a call
+ * @sock: The socket the call is on
+ * @call: The call to be informed
+ * @tx_total_len: The amount of data to be transmitted for this call
+ *
+ * Allow a kernel service to set the total transmit length on a call. This
+ * allows buffer-to-packet encrypt-and-copy to be performed.
+ *
+ * This function is primarily for use for setting the reply length since the
+ * request length can be set when beginning the call.
+ */
+void rxrpc_kernel_set_tx_length(struct socket *sock, struct rxrpc_call *call,
+ s64 tx_total_len)
+{
+ WARN_ON(call->tx_total_len != -1);
+ call->tx_total_len = tx_total_len;
+}
+EXPORT_SYMBOL(rxrpc_kernel_set_tx_length);
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.