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| author |   David Howells <dhowells@redhat.com> | 2017-06-07 12:40:03 +0100 |
|---|---|---|
| committer | David Howells <dhowells@redhat.com> | 2017-06-07 17:15:46 +0100 |
| commit | e754eba685aac2a9b5538176fa2d254ad25f464d (patch) | |
| tree | c8e650d72b8451f7d4ab93cd92eaed6549e84ae5 /net/rxrpc/af_rxrpc.c | |
| parent | rxrpc: Consolidate sendmsg parameters (diff) | |
| download | linux-dev-e754eba685aac2a9b5538176fa2d254ad25f464d.tar.xz linux-dev-e754eba685aac2a9b5538176fa2d254ad25f464d.zip | |
rxrpc: Provide a cmsg to specify the amount of Tx data for a call
Provide a control message that can be specified on the first sendmsg() of a
client call or the first sendmsg() of a service response to indicate the
total length of the data to be transmitted for that call.
Currently, because the length of the payload of an encrypted DATA packet is
encrypted in front of the data, the packet cannot be encrypted until we
know how much data it will hold.
By specifying the length at the beginning of the transmit phase, each DATA
packet length can be set before we start loading data from userspace (where
several sendmsg() calls may contribute to a particular packet).
An error will be returned if too little or too much data is presented in
the Tx phase.
Signed-off-by: David Howells <dhowells@redhat.com>
Diffstat (limited to 'net/rxrpc/af_rxrpc.c')
| -rw-r--r-- | net/rxrpc/af_rxrpc.c | 5 |
1 files changed, 4 insertions, 1 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; |