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@@ -0,0 +1,645 @@
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+/* AF_RXRPC sendmsg() implementation.
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+ *
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+ * Copyright (C) 2007, 2016 Red Hat, Inc. All Rights Reserved.
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+ * Written by David Howells (dhowells@redhat.com)
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+ *
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+ * This program is free software; you can redistribute it and/or
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+ * modify it under the terms of the GNU General Public Licence
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+ * as published by the Free Software Foundation; either version
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+ * 2 of the Licence, or (at your option) any later version.
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+ */
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+
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+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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+
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+#include <linux/net.h>
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+#include <linux/gfp.h>
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+#include <linux/skbuff.h>
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+#include <linux/export.h>
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+#include <linux/circ_buf.h>
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+#include <net/sock.h>
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+#include <net/af_rxrpc.h>
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+#include "ar-internal.h"
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+
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+static int rxrpc_send_data(struct rxrpc_sock *rx,
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+ struct rxrpc_call *call,
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+ struct msghdr *msg, size_t len);
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+
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+/*
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+ * extract control messages from the sendmsg() control buffer
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+ */
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+static int rxrpc_sendmsg_cmsg(struct msghdr *msg,
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+ unsigned long *user_call_ID,
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+ enum rxrpc_command *command,
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+ u32 *abort_code,
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+ bool *_exclusive)
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+{
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+ struct cmsghdr *cmsg;
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+ bool got_user_ID = false;
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+ int len;
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+
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+ *command = RXRPC_CMD_SEND_DATA;
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+
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+ if (msg->msg_controllen == 0)
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+ return -EINVAL;
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+
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+ for_each_cmsghdr(cmsg, msg) {
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+ if (!CMSG_OK(msg, cmsg))
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+ return -EINVAL;
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+
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+ len = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr));
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+ _debug("CMSG %d, %d, %d",
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+ cmsg->cmsg_level, cmsg->cmsg_type, len);
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+
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+ if (cmsg->cmsg_level != SOL_RXRPC)
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+ continue;
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+
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+ switch (cmsg->cmsg_type) {
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+ case RXRPC_USER_CALL_ID:
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+ if (msg->msg_flags & MSG_CMSG_COMPAT) {
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+ if (len != sizeof(u32))
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+ return -EINVAL;
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+ *user_call_ID = *(u32 *) CMSG_DATA(cmsg);
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+ } else {
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+ if (len != sizeof(unsigned long))
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+ return -EINVAL;
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+ *user_call_ID = *(unsigned long *)
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+ CMSG_DATA(cmsg);
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+ }
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+ _debug("User Call ID %lx", *user_call_ID);
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+ got_user_ID = true;
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+ break;
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+
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+ case RXRPC_ABORT:
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+ if (*command != RXRPC_CMD_SEND_DATA)
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+ return -EINVAL;
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+ *command = RXRPC_CMD_SEND_ABORT;
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+ if (len != sizeof(*abort_code))
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+ return -EINVAL;
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+ *abort_code = *(unsigned int *) CMSG_DATA(cmsg);
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+ _debug("Abort %x", *abort_code);
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+ if (*abort_code == 0)
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+ return -EINVAL;
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+ break;
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+
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+ case RXRPC_ACCEPT:
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+ if (*command != RXRPC_CMD_SEND_DATA)
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+ return -EINVAL;
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+ *command = RXRPC_CMD_ACCEPT;
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+ if (len != 0)
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+ return -EINVAL;
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+ break;
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+
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+ case RXRPC_EXCLUSIVE_CALL:
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+ *_exclusive = true;
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+ if (len != 0)
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+ return -EINVAL;
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+ break;
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+ default:
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+ return -EINVAL;
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+ }
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+ }
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+
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+ if (!got_user_ID)
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+ return -EINVAL;
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+ _leave(" = 0");
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+ return 0;
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+}
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+
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+/*
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+ * abort a call, sending an ABORT packet to the peer
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+ */
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+static void rxrpc_send_abort(struct rxrpc_call *call, u32 abort_code)
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+{
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+ if (call->state >= RXRPC_CALL_COMPLETE)
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+ return;
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+
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+ write_lock_bh(&call->state_lock);
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+
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+ if (__rxrpc_abort_call(call, abort_code, ECONNABORTED)) {
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+ del_timer_sync(&call->resend_timer);
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+ del_timer_sync(&call->ack_timer);
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+ clear_bit(RXRPC_CALL_EV_RESEND_TIMER, &call->events);
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+ clear_bit(RXRPC_CALL_EV_ACK, &call->events);
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+ clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags);
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+ rxrpc_queue_call(call);
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+ }
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+
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+ write_unlock_bh(&call->state_lock);
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+}
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+
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+/*
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+ * Create a new client call for sendmsg().
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+ */
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+static struct rxrpc_call *
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+rxrpc_new_client_call_for_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg,
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+ unsigned long user_call_ID, bool exclusive)
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+{
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+ struct rxrpc_conn_parameters cp;
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+ struct rxrpc_call *call;
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+ struct key *key;
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+
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+ DECLARE_SOCKADDR(struct sockaddr_rxrpc *, srx, msg->msg_name);
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+
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+ _enter("");
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+
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+ if (!msg->msg_name)
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+ return ERR_PTR(-EDESTADDRREQ);
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+
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+ key = rx->key;
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+ if (key && !rx->key->payload.data[0])
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+ key = NULL;
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+
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+ memset(&cp, 0, sizeof(cp));
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+ cp.local = rx->local;
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+ cp.key = rx->key;
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+ cp.security_level = rx->min_sec_level;
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+ cp.exclusive = rx->exclusive | exclusive;
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+ cp.service_id = srx->srx_service;
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+ call = rxrpc_new_client_call(rx, &cp, srx, user_call_ID, GFP_KERNEL);
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+
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+ _leave(" = %p\n", call);
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+ return call;
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+}
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+
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+/*
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+ * send a message forming part of a client call through an RxRPC socket
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+ * - caller holds the socket locked
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+ * - the socket may be either a client socket or a server socket
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+ */
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+int rxrpc_do_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg, size_t len)
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+{
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+ enum rxrpc_command cmd;
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+ struct rxrpc_call *call;
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+ unsigned long user_call_ID = 0;
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+ bool exclusive = false;
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+ u32 abort_code = 0;
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+ int ret;
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+
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+ _enter("");
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+
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+ ret = rxrpc_sendmsg_cmsg(msg, &user_call_ID, &cmd, &abort_code,
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+ &exclusive);
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+ if (ret < 0)
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+ return ret;
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+
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+ if (cmd == RXRPC_CMD_ACCEPT) {
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+ if (rx->sk.sk_state != RXRPC_SERVER_LISTENING)
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+ return -EINVAL;
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+ call = rxrpc_accept_call(rx, user_call_ID, NULL);
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+ if (IS_ERR(call))
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+ return PTR_ERR(call);
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+ rxrpc_put_call(call);
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+ return 0;
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+ }
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+
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+ call = rxrpc_find_call_by_user_ID(rx, user_call_ID);
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+ if (!call) {
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+ if (cmd != RXRPC_CMD_SEND_DATA)
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+ return -EBADSLT;
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+ call = rxrpc_new_client_call_for_sendmsg(rx, msg, user_call_ID,
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+ exclusive);
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+ if (IS_ERR(call))
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+ return PTR_ERR(call);
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+ }
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+
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+ rxrpc_see_call(call);
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+ _debug("CALL %d USR %lx ST %d on CONN %p",
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+ call->debug_id, call->user_call_ID, call->state, call->conn);
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+
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+ if (call->state >= RXRPC_CALL_COMPLETE) {
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+ /* it's too late for this call */
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+ ret = -ESHUTDOWN;
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+ } else if (cmd == RXRPC_CMD_SEND_ABORT) {
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+ rxrpc_send_abort(call, abort_code);
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+ ret = 0;
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+ } else if (cmd != RXRPC_CMD_SEND_DATA) {
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+ ret = -EINVAL;
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+ } else if (rxrpc_is_client_call(call) &&
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+ call->state != RXRPC_CALL_CLIENT_SEND_REQUEST) {
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+ /* request phase complete for this client call */
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+ ret = -EPROTO;
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+ } else if (rxrpc_is_service_call(call) &&
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+ call->state != RXRPC_CALL_SERVER_ACK_REQUEST &&
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+ call->state != RXRPC_CALL_SERVER_SEND_REPLY) {
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+ /* Reply phase not begun or not complete for service call. */
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+ ret = -EPROTO;
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+ } else {
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+ ret = rxrpc_send_data(rx, call, msg, len);
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+ }
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+
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+ rxrpc_put_call(call);
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+ _leave(" = %d", ret);
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+ return ret;
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+}
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+
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+/**
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+ * rxrpc_kernel_send_data - Allow a kernel service to send data on a call
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+ * @sock: The socket the call is on
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+ * @call: The call to send data through
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+ * @msg: The data to send
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+ * @len: The amount of data to send
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+ *
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+ * Allow a kernel service to send data on a call. The call must be in an state
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+ * appropriate to sending data. No control data should be supplied in @msg,
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+ * nor should an address be supplied. MSG_MORE should be flagged if there's
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+ * more data to come, otherwise this data will end the transmission phase.
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+ */
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+int rxrpc_kernel_send_data(struct socket *sock, struct rxrpc_call *call,
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+ struct msghdr *msg, size_t len)
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+{
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+ int ret;
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+
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+ _enter("{%d,%s},", call->debug_id, rxrpc_call_states[call->state]);
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+
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+ ASSERTCMP(msg->msg_name, ==, NULL);
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+ ASSERTCMP(msg->msg_control, ==, NULL);
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+
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+ lock_sock(sock->sk);
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+
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+ _debug("CALL %d USR %lx ST %d on CONN %p",
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+ call->debug_id, call->user_call_ID, call->state, call->conn);
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+
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+ if (call->state >= RXRPC_CALL_COMPLETE) {
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+ ret = -ESHUTDOWN; /* it's too late for this call */
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+ } else if (call->state != RXRPC_CALL_CLIENT_SEND_REQUEST &&
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+ call->state != RXRPC_CALL_SERVER_ACK_REQUEST &&
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+ call->state != RXRPC_CALL_SERVER_SEND_REPLY) {
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+ ret = -EPROTO; /* request phase complete for this client call */
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+ } else {
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+ ret = rxrpc_send_data(rxrpc_sk(sock->sk), call, msg, len);
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+ }
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+
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+ release_sock(sock->sk);
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+ _leave(" = %d", ret);
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+ return ret;
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+}
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+EXPORT_SYMBOL(rxrpc_kernel_send_data);
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+
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+/**
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+ * rxrpc_kernel_abort_call - Allow a kernel service to abort a call
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+ * @sock: The socket the call is on
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+ * @call: The call to be aborted
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+ * @abort_code: The abort code to stick into the ABORT packet
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+ *
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+ * Allow a kernel service to abort a call, if it's still in an abortable state.
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+ */
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+void rxrpc_kernel_abort_call(struct socket *sock, struct rxrpc_call *call,
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+ u32 abort_code)
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+{
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+ _enter("{%d},%d", call->debug_id, abort_code);
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+
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+ lock_sock(sock->sk);
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+
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+ _debug("CALL %d USR %lx ST %d on CONN %p",
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+ call->debug_id, call->user_call_ID, call->state, call->conn);
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+
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+ rxrpc_send_abort(call, abort_code);
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+
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+ release_sock(sock->sk);
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+ _leave("");
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+}
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+
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+EXPORT_SYMBOL(rxrpc_kernel_abort_call);
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+
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+/*
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+ * wait for space to appear in the transmit/ACK window
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+ * - caller holds the socket locked
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+ */
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+static int rxrpc_wait_for_tx_window(struct rxrpc_sock *rx,
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+ struct rxrpc_call *call,
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+ long *timeo)
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+{
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+ DECLARE_WAITQUEUE(myself, current);
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+ int ret;
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+
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+ _enter(",{%d},%ld",
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+ CIRC_SPACE(call->acks_head, ACCESS_ONCE(call->acks_tail),
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+ call->acks_winsz),
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+ *timeo);
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+
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+ add_wait_queue(&call->waitq, &myself);
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+
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+ for (;;) {
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+ set_current_state(TASK_INTERRUPTIBLE);
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+ ret = 0;
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+ if (CIRC_SPACE(call->acks_head, ACCESS_ONCE(call->acks_tail),
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+ call->acks_winsz) > 0)
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+ break;
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+ if (signal_pending(current)) {
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+ ret = sock_intr_errno(*timeo);
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+ break;
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+ }
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+
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+ release_sock(&rx->sk);
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+ *timeo = schedule_timeout(*timeo);
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+ lock_sock(&rx->sk);
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+ }
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+
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+ remove_wait_queue(&call->waitq, &myself);
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+ set_current_state(TASK_RUNNING);
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+ _leave(" = %d", ret);
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+ return ret;
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+}
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+
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+/*
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+ * attempt to schedule an instant Tx resend
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+ */
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+static inline void rxrpc_instant_resend(struct rxrpc_call *call)
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+{
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+ read_lock_bh(&call->state_lock);
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+ if (try_to_del_timer_sync(&call->resend_timer) >= 0) {
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+ clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags);
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+ if (call->state < RXRPC_CALL_COMPLETE &&
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+ !test_and_set_bit(RXRPC_CALL_EV_RESEND_TIMER, &call->events))
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+ rxrpc_queue_call(call);
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+ }
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+ read_unlock_bh(&call->state_lock);
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+}
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+
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+/*
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+ * queue a packet for transmission, set the resend timer and attempt
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+ * to send the packet immediately
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+ */
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+static void rxrpc_queue_packet(struct rxrpc_call *call, struct sk_buff *skb,
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+ bool last)
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+{
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+ struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
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+ int ret;
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+
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+ _net("queue skb %p [%d]", skb, call->acks_head);
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+
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+ ASSERT(call->acks_window != NULL);
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+ call->acks_window[call->acks_head] = (unsigned long) skb;
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+ smp_wmb();
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+ call->acks_head = (call->acks_head + 1) & (call->acks_winsz - 1);
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+
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+ if (last || call->state == RXRPC_CALL_SERVER_ACK_REQUEST) {
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+ _debug("________awaiting reply/ACK__________");
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+ write_lock_bh(&call->state_lock);
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+ switch (call->state) {
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+ case RXRPC_CALL_CLIENT_SEND_REQUEST:
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+ call->state = RXRPC_CALL_CLIENT_AWAIT_REPLY;
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+ break;
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+ case RXRPC_CALL_SERVER_ACK_REQUEST:
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+ call->state = RXRPC_CALL_SERVER_SEND_REPLY;
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+ if (!last)
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+ break;
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+ case RXRPC_CALL_SERVER_SEND_REPLY:
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+ call->state = RXRPC_CALL_SERVER_AWAIT_ACK;
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+ break;
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+ default:
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+ break;
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+ }
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+ write_unlock_bh(&call->state_lock);
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+ }
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+
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+ _proto("Tx DATA %%%u { #%u }", sp->hdr.serial, sp->hdr.seq);
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+
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+ sp->need_resend = false;
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+ sp->resend_at = jiffies + rxrpc_resend_timeout;
|
|
|
+ if (!test_and_set_bit(RXRPC_CALL_RUN_RTIMER, &call->flags)) {
|
|
|
+ _debug("run timer");
|
|
|
+ call->resend_timer.expires = sp->resend_at;
|
|
|
+ add_timer(&call->resend_timer);
|
|
|
+ }
|
|
|
+
|
|
|
+ /* attempt to cancel the rx-ACK timer, deferring reply transmission if
|
|
|
+ * we're ACK'ing the request phase of an incoming call */
|
|
|
+ ret = -EAGAIN;
|
|
|
+ if (try_to_del_timer_sync(&call->ack_timer) >= 0) {
|
|
|
+ /* the packet may be freed by rxrpc_process_call() before this
|
|
|
+ * returns */
|
|
|
+ if (rxrpc_is_client_call(call))
|
|
|
+ rxrpc_expose_client_call(call);
|
|
|
+ ret = rxrpc_send_data_packet(call->conn, skb);
|
|
|
+ _net("sent skb %p", skb);
|
|
|
+ } else {
|
|
|
+ _debug("failed to delete ACK timer");
|
|
|
+ }
|
|
|
+
|
|
|
+ if (ret < 0) {
|
|
|
+ _debug("need instant resend %d", ret);
|
|
|
+ sp->need_resend = true;
|
|
|
+ rxrpc_instant_resend(call);
|
|
|
+ }
|
|
|
+
|
|
|
+ _leave("");
|
|
|
+}
|
|
|
+
|
|
|
+/*
|
|
|
+ * Convert a host-endian header into a network-endian header.
|
|
|
+ */
|
|
|
+static void rxrpc_insert_header(struct sk_buff *skb)
|
|
|
+{
|
|
|
+ struct rxrpc_wire_header whdr;
|
|
|
+ struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
|
|
|
+
|
|
|
+ whdr.epoch = htonl(sp->hdr.epoch);
|
|
|
+ whdr.cid = htonl(sp->hdr.cid);
|
|
|
+ whdr.callNumber = htonl(sp->hdr.callNumber);
|
|
|
+ whdr.seq = htonl(sp->hdr.seq);
|
|
|
+ whdr.serial = htonl(sp->hdr.serial);
|
|
|
+ whdr.type = sp->hdr.type;
|
|
|
+ whdr.flags = sp->hdr.flags;
|
|
|
+ whdr.userStatus = sp->hdr.userStatus;
|
|
|
+ whdr.securityIndex = sp->hdr.securityIndex;
|
|
|
+ whdr._rsvd = htons(sp->hdr._rsvd);
|
|
|
+ whdr.serviceId = htons(sp->hdr.serviceId);
|
|
|
+
|
|
|
+ memcpy(skb->head, &whdr, sizeof(whdr));
|
|
|
+}
|
|
|
+
|
|
|
+/*
|
|
|
+ * send data through a socket
|
|
|
+ * - must be called in process context
|
|
|
+ * - caller holds the socket locked
|
|
|
+ */
|
|
|
+static int rxrpc_send_data(struct rxrpc_sock *rx,
|
|
|
+ struct rxrpc_call *call,
|
|
|
+ struct msghdr *msg, size_t len)
|
|
|
+{
|
|
|
+ struct rxrpc_skb_priv *sp;
|
|
|
+ struct sk_buff *skb;
|
|
|
+ struct sock *sk = &rx->sk;
|
|
|
+ long timeo;
|
|
|
+ bool more;
|
|
|
+ int ret, copied;
|
|
|
+
|
|
|
+ timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
|
|
|
+
|
|
|
+ /* this should be in poll */
|
|
|
+ sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk);
|
|
|
+
|
|
|
+ if (sk->sk_err || (sk->sk_shutdown & SEND_SHUTDOWN))
|
|
|
+ return -EPIPE;
|
|
|
+
|
|
|
+ more = msg->msg_flags & MSG_MORE;
|
|
|
+
|
|
|
+ skb = call->tx_pending;
|
|
|
+ call->tx_pending = NULL;
|
|
|
+ rxrpc_see_skb(skb);
|
|
|
+
|
|
|
+ copied = 0;
|
|
|
+ do {
|
|
|
+ if (!skb) {
|
|
|
+ size_t size, chunk, max, space;
|
|
|
+
|
|
|
+ _debug("alloc");
|
|
|
+
|
|
|
+ if (CIRC_SPACE(call->acks_head,
|
|
|
+ ACCESS_ONCE(call->acks_tail),
|
|
|
+ call->acks_winsz) <= 0) {
|
|
|
+ ret = -EAGAIN;
|
|
|
+ if (msg->msg_flags & MSG_DONTWAIT)
|
|
|
+ goto maybe_error;
|
|
|
+ ret = rxrpc_wait_for_tx_window(rx, call,
|
|
|
+ &timeo);
|
|
|
+ if (ret < 0)
|
|
|
+ goto maybe_error;
|
|
|
+ }
|
|
|
+
|
|
|
+ max = call->conn->params.peer->maxdata;
|
|
|
+ max -= call->conn->security_size;
|
|
|
+ max &= ~(call->conn->size_align - 1UL);
|
|
|
+
|
|
|
+ chunk = max;
|
|
|
+ if (chunk > msg_data_left(msg) && !more)
|
|
|
+ chunk = msg_data_left(msg);
|
|
|
+
|
|
|
+ space = chunk + call->conn->size_align;
|
|
|
+ space &= ~(call->conn->size_align - 1UL);
|
|
|
+
|
|
|
+ size = space + call->conn->header_size;
|
|
|
+
|
|
|
+ _debug("SIZE: %zu/%zu/%zu", chunk, space, size);
|
|
|
+
|
|
|
+ /* create a buffer that we can retain until it's ACK'd */
|
|
|
+ skb = sock_alloc_send_skb(
|
|
|
+ sk, size, msg->msg_flags & MSG_DONTWAIT, &ret);
|
|
|
+ if (!skb)
|
|
|
+ goto maybe_error;
|
|
|
+
|
|
|
+ rxrpc_new_skb(skb);
|
|
|
+
|
|
|
+ _debug("ALLOC SEND %p", skb);
|
|
|
+
|
|
|
+ ASSERTCMP(skb->mark, ==, 0);
|
|
|
+
|
|
|
+ _debug("HS: %u", call->conn->header_size);
|
|
|
+ skb_reserve(skb, call->conn->header_size);
|
|
|
+ skb->len += call->conn->header_size;
|
|
|
+
|
|
|
+ sp = rxrpc_skb(skb);
|
|
|
+ sp->remain = chunk;
|
|
|
+ if (sp->remain > skb_tailroom(skb))
|
|
|
+ sp->remain = skb_tailroom(skb);
|
|
|
+
|
|
|
+ _net("skb: hr %d, tr %d, hl %d, rm %d",
|
|
|
+ skb_headroom(skb),
|
|
|
+ skb_tailroom(skb),
|
|
|
+ skb_headlen(skb),
|
|
|
+ sp->remain);
|
|
|
+
|
|
|
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
|
|
|
+ }
|
|
|
+
|
|
|
+ _debug("append");
|
|
|
+ sp = rxrpc_skb(skb);
|
|
|
+
|
|
|
+ /* append next segment of data to the current buffer */
|
|
|
+ if (msg_data_left(msg) > 0) {
|
|
|
+ int copy = skb_tailroom(skb);
|
|
|
+ ASSERTCMP(copy, >, 0);
|
|
|
+ if (copy > msg_data_left(msg))
|
|
|
+ copy = msg_data_left(msg);
|
|
|
+ if (copy > sp->remain)
|
|
|
+ copy = sp->remain;
|
|
|
+
|
|
|
+ _debug("add");
|
|
|
+ ret = skb_add_data(skb, &msg->msg_iter, copy);
|
|
|
+ _debug("added");
|
|
|
+ if (ret < 0)
|
|
|
+ goto efault;
|
|
|
+ sp->remain -= copy;
|
|
|
+ skb->mark += copy;
|
|
|
+ copied += copy;
|
|
|
+ }
|
|
|
+
|
|
|
+ /* check for the far side aborting the call or a network error
|
|
|
+ * occurring */
|
|
|
+ if (call->state == RXRPC_CALL_COMPLETE)
|
|
|
+ goto call_terminated;
|
|
|
+
|
|
|
+ /* add the packet to the send queue if it's now full */
|
|
|
+ if (sp->remain <= 0 ||
|
|
|
+ (msg_data_left(msg) == 0 && !more)) {
|
|
|
+ struct rxrpc_connection *conn = call->conn;
|
|
|
+ uint32_t seq;
|
|
|
+ size_t pad;
|
|
|
+
|
|
|
+ /* pad out if we're using security */
|
|
|
+ if (conn->security_ix) {
|
|
|
+ pad = conn->security_size + skb->mark;
|
|
|
+ pad = conn->size_align - pad;
|
|
|
+ pad &= conn->size_align - 1;
|
|
|
+ _debug("pad %zu", pad);
|
|
|
+ if (pad)
|
|
|
+ memset(skb_put(skb, pad), 0, pad);
|
|
|
+ }
|
|
|
+
|
|
|
+ seq = atomic_inc_return(&call->sequence);
|
|
|
+
|
|
|
+ sp->hdr.epoch = conn->proto.epoch;
|
|
|
+ sp->hdr.cid = call->cid;
|
|
|
+ sp->hdr.callNumber = call->call_id;
|
|
|
+ sp->hdr.seq = seq;
|
|
|
+ sp->hdr.serial = atomic_inc_return(&conn->serial);
|
|
|
+ sp->hdr.type = RXRPC_PACKET_TYPE_DATA;
|
|
|
+ sp->hdr.userStatus = 0;
|
|
|
+ sp->hdr.securityIndex = conn->security_ix;
|
|
|
+ sp->hdr._rsvd = 0;
|
|
|
+ sp->hdr.serviceId = call->service_id;
|
|
|
+
|
|
|
+ sp->hdr.flags = conn->out_clientflag;
|
|
|
+ if (msg_data_left(msg) == 0 && !more)
|
|
|
+ sp->hdr.flags |= RXRPC_LAST_PACKET;
|
|
|
+ else if (CIRC_SPACE(call->acks_head,
|
|
|
+ ACCESS_ONCE(call->acks_tail),
|
|
|
+ call->acks_winsz) > 1)
|
|
|
+ sp->hdr.flags |= RXRPC_MORE_PACKETS;
|
|
|
+ if (more && seq & 1)
|
|
|
+ sp->hdr.flags |= RXRPC_REQUEST_ACK;
|
|
|
+
|
|
|
+ ret = conn->security->secure_packet(
|
|
|
+ call, skb, skb->mark,
|
|
|
+ skb->head + sizeof(struct rxrpc_wire_header));
|
|
|
+ if (ret < 0)
|
|
|
+ goto out;
|
|
|
+
|
|
|
+ rxrpc_insert_header(skb);
|
|
|
+ rxrpc_queue_packet(call, skb, !msg_data_left(msg) && !more);
|
|
|
+ skb = NULL;
|
|
|
+ }
|
|
|
+ } while (msg_data_left(msg) > 0);
|
|
|
+
|
|
|
+success:
|
|
|
+ ret = copied;
|
|
|
+out:
|
|
|
+ call->tx_pending = skb;
|
|
|
+ _leave(" = %d", ret);
|
|
|
+ return ret;
|
|
|
+
|
|
|
+call_terminated:
|
|
|
+ rxrpc_free_skb(skb);
|
|
|
+ _leave(" = %d", -call->error);
|
|
|
+ return ret;
|
|
|
+
|
|
|
+maybe_error:
|
|
|
+ if (copied)
|
|
|
+ goto success;
|
|
|
+ goto out;
|
|
|
+
|
|
|
+efault:
|
|
|
+ ret = -EFAULT;
|
|
|
+ goto out;
|
|
|
+}
|
David Howells