rxrpc: Rearrange net/rxrpc/sendmsg.c
Rearrange net/rxrpc/sendmsg.c to be in a more logical order. This makes it easier to follow and eliminates forward declarations. Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
David Howells
Родитель
0b58b8a18b
Коммит
df423a4af1
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@ -20,287 +20,6 @@
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#include <net/af_rxrpc.h>
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#include "ar-internal.h"
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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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* 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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*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_each_cmsghdr(cmsg, msg) {
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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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got_user_ID = true;
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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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break;
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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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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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* 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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write_lock_bh(&call->state_lock);
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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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write_unlock_bh(&call->state_lock);
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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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DECLARE_SOCKADDR(struct sockaddr_rxrpc *, srx, msg->msg_name);
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_enter("");
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if (!msg->msg_name)
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return ERR_PTR(-EDESTADDRREQ);
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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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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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_leave(" = %p\n", call);
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return call;
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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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_enter("");
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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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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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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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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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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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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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* @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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_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(sock->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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ret = rxrpc_send_data(rxrpc_sk(sock->sk), call, msg, len);
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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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* 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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lock_sock(sock->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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rxrpc_send_abort(call, abort_code);
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release_sock(sock->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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* wait for space to appear in the transmit/ACK window
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* - caller holds the socket locked
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@ -643,3 +362,280 @@ efault:
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ret = -EFAULT;
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goto out;
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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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*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_each_cmsghdr(cmsg, msg) {
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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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got_user_ID = true;
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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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break;
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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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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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* 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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write_lock_bh(&call->state_lock);
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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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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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DECLARE_SOCKADDR(struct sockaddr_rxrpc *, srx, msg->msg_name);
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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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|
||||
/*
|
||||
* send a message forming part of a client call through an RxRPC socket
|
||||
* - caller holds the socket locked
|
||||
* - the socket may be either a client socket or a server socket
|
||||
*/
|
||||
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;
|
||||
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;
|
||||
|
||||
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))
|
||||
return PTR_ERR(call);
|
||||
rxrpc_put_call(call);
|
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return 0;
|
||||
}
|
||||
|
||||
call = rxrpc_find_call_by_user_ID(rx, user_call_ID);
|
||||
if (!call) {
|
||||
if (cmd != RXRPC_CMD_SEND_DATA)
|
||||
return -EBADSLT;
|
||||
call = rxrpc_new_client_call_for_sendmsg(rx, msg, user_call_ID,
|
||||
exclusive);
|
||||
if (IS_ERR(call))
|
||||
return PTR_ERR(call);
|
||||
}
|
||||
|
||||
rxrpc_see_call(call);
|
||||
_debug("CALL %d USR %lx ST %d on CONN %p",
|
||||
call->debug_id, call->user_call_ID, call->state, call->conn);
|
||||
|
||||
if (call->state >= RXRPC_CALL_COMPLETE) {
|
||||
/* it's too late for this call */
|
||||
ret = -ESHUTDOWN;
|
||||
} else if (cmd == RXRPC_CMD_SEND_ABORT) {
|
||||
rxrpc_send_abort(call, abort_code);
|
||||
ret = 0;
|
||||
} else if (cmd != RXRPC_CMD_SEND_DATA) {
|
||||
ret = -EINVAL;
|
||||
} else if (rxrpc_is_client_call(call) &&
|
||||
call->state != RXRPC_CALL_CLIENT_SEND_REQUEST) {
|
||||
/* request phase complete for this client call */
|
||||
ret = -EPROTO;
|
||||
} else if (rxrpc_is_service_call(call) &&
|
||||
call->state != RXRPC_CALL_SERVER_ACK_REQUEST &&
|
||||
call->state != RXRPC_CALL_SERVER_SEND_REPLY) {
|
||||
/* Reply phase not begun or not complete for service call. */
|
||||
ret = -EPROTO;
|
||||
} else {
|
||||
ret = rxrpc_send_data(rx, call, msg, len);
|
||||
}
|
||||
|
||||
rxrpc_put_call(call);
|
||||
_leave(" = %d", ret);
|
||||
return ret;
|
||||
}
|
||||
|
||||
/**
|
||||
* rxrpc_kernel_send_data - Allow a kernel service to send data on a call
|
||||
* @sock: The socket the call is on
|
||||
* @call: The call to send data through
|
||||
* @msg: The data to send
|
||||
* @len: The amount of data to send
|
||||
*
|
||||
* Allow a kernel service to send data on a call. The call must be in an state
|
||||
* appropriate to sending data. No control data should be supplied in @msg,
|
||||
* nor should an address be supplied. MSG_MORE should be flagged if there's
|
||||
* more data to come, otherwise this data will end the transmission phase.
|
||||
*/
|
||||
int rxrpc_kernel_send_data(struct socket *sock, struct rxrpc_call *call,
|
||||
struct msghdr *msg, size_t len)
|
||||
{
|
||||
int ret;
|
||||
|
||||
_enter("{%d,%s},", call->debug_id, rxrpc_call_states[call->state]);
|
||||
|
||||
ASSERTCMP(msg->msg_name, ==, NULL);
|
||||
ASSERTCMP(msg->msg_control, ==, NULL);
|
||||
|
||||
lock_sock(sock->sk);
|
||||
|
||||
_debug("CALL %d USR %lx ST %d on CONN %p",
|
||||
call->debug_id, call->user_call_ID, call->state, call->conn);
|
||||
|
||||
if (call->state >= RXRPC_CALL_COMPLETE) {
|
||||
ret = -ESHUTDOWN; /* it's too late for this call */
|
||||
} else if (call->state != RXRPC_CALL_CLIENT_SEND_REQUEST &&
|
||||
call->state != RXRPC_CALL_SERVER_ACK_REQUEST &&
|
||||
call->state != RXRPC_CALL_SERVER_SEND_REPLY) {
|
||||
ret = -EPROTO; /* request phase complete for this client call */
|
||||
} else {
|
||||
ret = rxrpc_send_data(rxrpc_sk(sock->sk), call, msg, len);
|
||||
}
|
||||
|
||||
release_sock(sock->sk);
|
||||
_leave(" = %d", ret);
|
||||
return ret;
|
||||
}
|
||||
EXPORT_SYMBOL(rxrpc_kernel_send_data);
|
||||
|
||||
/**
|
||||
* rxrpc_kernel_abort_call - Allow a kernel service to abort a call
|
||||
* @sock: The socket the call is on
|
||||
* @call: The call to be aborted
|
||||
* @abort_code: The abort code to stick into the ABORT packet
|
||||
*
|
||||
* Allow a kernel service to abort a call, if it's still in an abortable state.
|
||||
*/
|
||||
void rxrpc_kernel_abort_call(struct socket *sock, struct rxrpc_call *call,
|
||||
u32 abort_code)
|
||||
{
|
||||
_enter("{%d},%d", call->debug_id, abort_code);
|
||||
|
||||
lock_sock(sock->sk);
|
||||
|
||||
_debug("CALL %d USR %lx ST %d on CONN %p",
|
||||
call->debug_id, call->user_call_ID, call->state, call->conn);
|
||||
|
||||
rxrpc_send_abort(call, abort_code);
|
||||
|
||||
release_sock(sock->sk);
|
||||
_leave("");
|
||||
}
|
||||
|
||||
EXPORT_SYMBOL(rxrpc_kernel_abort_call);
|
||||
|
|
|
|||
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