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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/call_object.c | |
| parent | 3ab26a6fd01ba211ba5dea0d86d53897b9e8430c (diff) | |
| download | linux-e754eba685aac2a9b5538176fa2d254ad25f464d.tar.gz linux-e754eba685aac2a9b5538176fa2d254ad25f464d.tar.bz2 linux-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/call_object.c')
| -rw-r--r-- | net/rxrpc/call_object.c | 3 |
1 files changed, 3 insertions, 0 deletions
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); |