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![David Howells](/assets/img/avatar_default.png)
Return the number of bytes buffered in rxrpc_send_data(). Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
737 lines
18 KiB
C
737 lines
18 KiB
C
/* RxRPC packet transmission
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*
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* Copyright (C) 2007 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 License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/net.h>
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#include <linux/skbuff.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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int rxrpc_resend_timeout = 4;
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static int rxrpc_send_data(struct kiocb *iocb,
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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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* extract control messages from the sendmsg() control buffer
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*/
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static int rxrpc_sendmsg_cmsg(struct rxrpc_sock *rx, 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 server)
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{
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struct cmsghdr *cmsg;
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int len;
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*command = RXRPC_CMD_SEND_DATA;
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if (msg->msg_controllen == 0)
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return -EINVAL;
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for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
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if (!CMSG_OK(msg, cmsg))
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return -EINVAL;
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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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if (cmsg->cmsg_level != SOL_RXRPC)
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continue;
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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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break;
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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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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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if (!server)
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return -EISCONN;
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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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_leave(" = 0");
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return 0;
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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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write_lock_bh(&call->state_lock);
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if (call->state <= RXRPC_CALL_COMPLETE) {
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call->state = RXRPC_CALL_LOCALLY_ABORTED;
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call->abort_code = abort_code;
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set_bit(RXRPC_CALL_ABORT, &call->events);
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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_RESEND_TIMER, &call->events);
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clear_bit(RXRPC_CALL_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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write_unlock_bh(&call->state_lock);
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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_client_sendmsg(struct kiocb *iocb, struct rxrpc_sock *rx,
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struct rxrpc_transport *trans, struct msghdr *msg,
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size_t len)
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{
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struct rxrpc_conn_bundle *bundle;
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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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struct key *key;
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__be16 service_id;
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u32 abort_code = 0;
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int ret;
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_enter("");
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ASSERT(trans != NULL);
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ret = rxrpc_sendmsg_cmsg(rx, msg, &user_call_ID, &cmd, &abort_code,
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false);
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if (ret < 0)
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return ret;
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bundle = NULL;
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if (trans) {
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service_id = rx->service_id;
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if (msg->msg_name) {
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struct sockaddr_rxrpc *srx =
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(struct sockaddr_rxrpc *) msg->msg_name;
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service_id = htons(srx->srx_service);
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}
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key = rx->key;
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if (key && !rx->key->payload.data)
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key = NULL;
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bundle = rxrpc_get_bundle(rx, trans, key, service_id,
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GFP_KERNEL);
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if (IS_ERR(bundle))
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return PTR_ERR(bundle);
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}
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call = rxrpc_get_client_call(rx, trans, bundle, user_call_ID,
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abort_code == 0, GFP_KERNEL);
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if (trans)
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rxrpc_put_bundle(trans, bundle);
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if (IS_ERR(call)) {
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_leave(" = %ld", PTR_ERR(call));
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return PTR_ERR(call);
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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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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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} else if (cmd != RXRPC_CMD_SEND_DATA) {
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ret = -EINVAL;
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} else if (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 {
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ret = rxrpc_send_data(iocb, rx, call, msg, len);
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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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* rxrpc_kernel_send_data - Allow a kernel service to send data on a call
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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 rxrpc_call *call, struct msghdr *msg,
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size_t len)
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{
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int ret;
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_enter("{%d,%s},", call->debug_id, rxrpc_call_states[call->state]);
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ASSERTCMP(msg->msg_name, ==, NULL);
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ASSERTCMP(msg->msg_control, ==, NULL);
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lock_sock(&call->socket->sk);
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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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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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mm_segment_t oldfs = get_fs();
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set_fs(KERNEL_DS);
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ret = rxrpc_send_data(NULL, call->socket, call, msg, len);
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set_fs(oldfs);
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}
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release_sock(&call->socket->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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* rxrpc_kernel_abort_call - Allow a kernel service to abort a call
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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 rxrpc_call *call, u32 abort_code)
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{
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_enter("{%d},%d", call->debug_id, abort_code);
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lock_sock(&call->socket->sk);
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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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if (call->state < RXRPC_CALL_COMPLETE)
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rxrpc_send_abort(call, abort_code);
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release_sock(&call->socket->sk);
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_leave("");
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}
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EXPORT_SYMBOL(rxrpc_kernel_abort_call);
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/*
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* send a message through a server socket
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* - caller holds the socket locked
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*/
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int rxrpc_server_sendmsg(struct kiocb *iocb, struct rxrpc_sock *rx,
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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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u32 abort_code = 0;
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int ret;
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_enter("");
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ret = rxrpc_sendmsg_cmsg(rx, msg, &user_call_ID, &cmd, &abort_code,
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true);
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if (ret < 0)
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return ret;
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if (cmd == RXRPC_CMD_ACCEPT) {
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call = rxrpc_accept_call(rx, user_call_ID);
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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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call = rxrpc_find_server_call(rx, user_call_ID);
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if (!call)
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return -EBADSLT;
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if (call->state >= RXRPC_CALL_COMPLETE) {
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ret = -ESHUTDOWN;
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goto out;
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}
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switch (cmd) {
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case RXRPC_CMD_SEND_DATA:
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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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/* Tx phase not yet begun for this call */
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ret = -EPROTO;
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break;
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}
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ret = rxrpc_send_data(iocb, rx, call, msg, len);
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break;
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case RXRPC_CMD_SEND_ABORT:
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rxrpc_send_abort(call, abort_code);
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break;
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default:
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BUG();
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}
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out:
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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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* send a packet through the transport endpoint
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*/
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int rxrpc_send_packet(struct rxrpc_transport *trans, struct sk_buff *skb)
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{
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struct kvec iov[1];
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struct msghdr msg;
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int ret, opt;
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_enter(",{%d}", skb->len);
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iov[0].iov_base = skb->head;
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iov[0].iov_len = skb->len;
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msg.msg_name = &trans->peer->srx.transport.sin;
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msg.msg_namelen = sizeof(trans->peer->srx.transport.sin);
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msg.msg_control = NULL;
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msg.msg_controllen = 0;
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msg.msg_flags = 0;
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/* send the packet with the don't fragment bit set if we currently
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* think it's small enough */
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if (skb->len - sizeof(struct rxrpc_header) < trans->peer->maxdata) {
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down_read(&trans->local->defrag_sem);
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/* send the packet by UDP
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* - returns -EMSGSIZE if UDP would have to fragment the packet
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* to go out of the interface
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* - in which case, we'll have processed the ICMP error
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* message and update the peer record
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*/
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ret = kernel_sendmsg(trans->local->socket, &msg, iov, 1,
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iov[0].iov_len);
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up_read(&trans->local->defrag_sem);
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if (ret == -EMSGSIZE)
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goto send_fragmentable;
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_leave(" = %d [%u]", ret, trans->peer->maxdata);
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return ret;
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}
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send_fragmentable:
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/* attempt to send this message with fragmentation enabled */
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_debug("send fragment");
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down_write(&trans->local->defrag_sem);
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opt = IP_PMTUDISC_DONT;
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ret = kernel_setsockopt(trans->local->socket, SOL_IP, IP_MTU_DISCOVER,
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(char *) &opt, sizeof(opt));
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if (ret == 0) {
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ret = kernel_sendmsg(trans->local->socket, &msg, iov, 1,
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iov[0].iov_len);
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opt = IP_PMTUDISC_DO;
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kernel_setsockopt(trans->local->socket, SOL_IP,
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IP_MTU_DISCOVER, (char *) &opt, sizeof(opt));
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}
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up_write(&trans->local->defrag_sem);
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_leave(" = %d [frag %u]", ret, trans->peer->maxdata);
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return ret;
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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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_enter(",{%d},%ld",
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CIRC_SPACE(call->acks_head, call->acks_tail, call->acks_winsz),
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*timeo);
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add_wait_queue(&call->tx_waitq, &myself);
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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, 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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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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remove_wait_queue(&call->tx_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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* 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_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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* 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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_net("queue skb %p [%d]", skb, call->acks_head);
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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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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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_proto("Tx DATA %%%u { #%u }",
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ntohl(sp->hdr.serial), ntohl(sp->hdr.seq));
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sp->need_resend = 0;
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sp->resend_at = jiffies + rxrpc_resend_timeout * HZ;
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if (!test_and_set_bit(RXRPC_CALL_RUN_RTIMER, &call->flags)) {
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_debug("run timer");
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call->resend_timer.expires = sp->resend_at;
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add_timer(&call->resend_timer);
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}
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/* attempt to cancel the rx-ACK timer, deferring reply transmission if
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* we're ACK'ing the request phase of an incoming call */
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ret = -EAGAIN;
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if (try_to_del_timer_sync(&call->ack_timer) >= 0) {
|
|
/* the packet may be freed by rxrpc_process_call() before this
|
|
* returns */
|
|
ret = rxrpc_send_packet(call->conn->trans, 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 = 1;
|
|
rxrpc_instant_resend(call);
|
|
}
|
|
|
|
_leave("");
|
|
}
|
|
|
|
/*
|
|
* send data through a socket
|
|
* - must be called in process context
|
|
* - caller holds the socket locked
|
|
*/
|
|
static int rxrpc_send_data(struct kiocb *iocb,
|
|
struct rxrpc_sock *rx,
|
|
struct rxrpc_call *call,
|
|
struct msghdr *msg, size_t len)
|
|
{
|
|
struct rxrpc_skb_priv *sp;
|
|
unsigned char __user *from;
|
|
struct sk_buff *skb;
|
|
struct iovec *iov;
|
|
struct sock *sk = &rx->sk;
|
|
long timeo;
|
|
bool more;
|
|
int ret, ioc, segment, copied;
|
|
|
|
_enter(",,,{%zu},%zu", msg->msg_iovlen, len);
|
|
|
|
timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
|
|
|
|
/* this should be in poll */
|
|
clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
|
|
|
|
if (sk->sk_err || (sk->sk_shutdown & SEND_SHUTDOWN))
|
|
return -EPIPE;
|
|
|
|
iov = msg->msg_iov;
|
|
ioc = msg->msg_iovlen - 1;
|
|
from = iov->iov_base;
|
|
segment = iov->iov_len;
|
|
iov++;
|
|
more = msg->msg_flags & MSG_MORE;
|
|
|
|
skb = call->tx_pending;
|
|
call->tx_pending = NULL;
|
|
|
|
copied = 0;
|
|
do {
|
|
int copy;
|
|
|
|
if (segment > len)
|
|
segment = len;
|
|
|
|
_debug("SEGMENT %d @%p", segment, from);
|
|
|
|
if (!skb) {
|
|
size_t size, chunk, max, space;
|
|
|
|
_debug("alloc");
|
|
|
|
if (CIRC_SPACE(call->acks_head, 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->trans->peer->maxdata;
|
|
max -= call->conn->security_size;
|
|
max &= ~(call->conn->size_align - 1UL);
|
|
|
|
chunk = max;
|
|
if (chunk > len && !more)
|
|
chunk = len;
|
|
|
|
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 */
|
|
copy = skb_tailroom(skb);
|
|
ASSERTCMP(copy, >, 0);
|
|
if (copy > segment)
|
|
copy = segment;
|
|
if (copy > sp->remain)
|
|
copy = sp->remain;
|
|
|
|
_debug("add");
|
|
ret = skb_add_data(skb, from, copy);
|
|
_debug("added");
|
|
if (ret < 0)
|
|
goto efault;
|
|
sp->remain -= copy;
|
|
skb->mark += copy;
|
|
copied += copy;
|
|
|
|
len -= copy;
|
|
segment -= copy;
|
|
from += copy;
|
|
while (segment == 0 && ioc > 0) {
|
|
from = iov->iov_base;
|
|
segment = iov->iov_len;
|
|
iov++;
|
|
ioc--;
|
|
}
|
|
if (len == 0) {
|
|
segment = 0;
|
|
ioc = 0;
|
|
}
|
|
|
|
/* check for the far side aborting the call or a network error
|
|
* occurring */
|
|
if (call->state > RXRPC_CALL_COMPLETE)
|
|
goto call_aborted;
|
|
|
|
/* add the packet to the send queue if it's now full */
|
|
if (sp->remain <= 0 || (segment == 0 && !more)) {
|
|
struct rxrpc_connection *conn = call->conn;
|
|
size_t pad;
|
|
|
|
/* pad out if we're using security */
|
|
if (conn->security) {
|
|
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);
|
|
}
|
|
|
|
sp->hdr.epoch = conn->epoch;
|
|
sp->hdr.cid = call->cid;
|
|
sp->hdr.callNumber = call->call_id;
|
|
sp->hdr.seq =
|
|
htonl(atomic_inc_return(&call->sequence));
|
|
sp->hdr.serial =
|
|
htonl(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 = conn->service_id;
|
|
|
|
sp->hdr.flags = conn->out_clientflag;
|
|
if (len == 0 && !more)
|
|
sp->hdr.flags |= RXRPC_LAST_PACKET;
|
|
else if (CIRC_SPACE(call->acks_head, call->acks_tail,
|
|
call->acks_winsz) > 1)
|
|
sp->hdr.flags |= RXRPC_MORE_PACKETS;
|
|
|
|
ret = rxrpc_secure_packet(
|
|
call, skb, skb->mark,
|
|
skb->head + sizeof(struct rxrpc_header));
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
memcpy(skb->head, &sp->hdr,
|
|
sizeof(struct rxrpc_header));
|
|
rxrpc_queue_packet(call, skb, segment == 0 && !more);
|
|
skb = NULL;
|
|
}
|
|
|
|
} while (segment > 0);
|
|
|
|
success:
|
|
ret = copied;
|
|
out:
|
|
call->tx_pending = skb;
|
|
_leave(" = %d", ret);
|
|
return ret;
|
|
|
|
call_aborted:
|
|
rxrpc_free_skb(skb);
|
|
if (call->state == RXRPC_CALL_NETWORK_ERROR)
|
|
ret = call->conn->trans->peer->net_error;
|
|
else
|
|
ret = -ECONNABORTED;
|
|
_leave(" = %d", ret);
|
|
return ret;
|
|
|
|
maybe_error:
|
|
if (copied)
|
|
goto success;
|
|
goto out;
|
|
|
|
efault:
|
|
ret = -EFAULT;
|
|
goto out;
|
|
}
|