[PATCH net-next 1/3] rxrpc: Split sendmsg from packet transmission code
From: David Howells
Date: Sun Sep 04 2016 - 17:05:33 EST
Split the sendmsg code from the packet transmission code (mostly to be
found in output.c).
Signed-off-by: David Howells <dhowells@xxxxxxxxxx>
---
net/rxrpc/Makefile | 1
net/rxrpc/ar-internal.h | 9 -
net/rxrpc/misc.c | 5
net/rxrpc/output.c | 630 ----------------------------------------------
net/rxrpc/sendmsg.c | 645 +++++++++++++++++++++++++++++++++++++++++++++++
5 files changed, 657 insertions(+), 633 deletions(-)
create mode 100644 net/rxrpc/sendmsg.c
diff --git a/net/rxrpc/Makefile b/net/rxrpc/Makefile
index 10f3f48a16a8..8fc6ea347182 100644
--- a/net/rxrpc/Makefile
+++ b/net/rxrpc/Makefile
@@ -22,6 +22,7 @@ af-rxrpc-y := \
peer_object.o \
recvmsg.o \
security.o \
+ sendmsg.o \
skbuff.o \
utils.o
diff --git a/net/rxrpc/ar-internal.h b/net/rxrpc/ar-internal.h
index 4e86d248dc5e..464dfda2a995 100644
--- a/net/rxrpc/ar-internal.h
+++ b/net/rxrpc/ar-internal.h
@@ -814,6 +814,7 @@ extern unsigned int rxrpc_idle_ack_delay;
extern unsigned int rxrpc_rx_window_size;
extern unsigned int rxrpc_rx_mtu;
extern unsigned int rxrpc_rx_jumbo_max;
+extern unsigned int rxrpc_resend_timeout;
extern const char *const rxrpc_pkts[];
extern const s8 rxrpc_ack_priority[];
@@ -823,10 +824,7 @@ extern const char *rxrpc_acks(u8 reason);
/*
* output.c
*/
-extern unsigned int rxrpc_resend_timeout;
-
int rxrpc_send_data_packet(struct rxrpc_connection *, struct sk_buff *);
-int rxrpc_do_sendmsg(struct rxrpc_sock *, struct msghdr *, size_t);
/*
* peer_event.c
@@ -888,6 +886,11 @@ int __init rxrpc_init_security(void);
void rxrpc_exit_security(void);
int rxrpc_init_client_conn_security(struct rxrpc_connection *);
int rxrpc_init_server_conn_security(struct rxrpc_connection *);
+
+/*
+ * sendmsg.c
+ */
+int rxrpc_do_sendmsg(struct rxrpc_sock *, struct msghdr *, size_t);
/*
* skbuff.c
diff --git a/net/rxrpc/misc.c b/net/rxrpc/misc.c
index bdc5e42fe600..39e7cc37c392 100644
--- a/net/rxrpc/misc.c
+++ b/net/rxrpc/misc.c
@@ -64,6 +64,11 @@ unsigned int rxrpc_rx_mtu = 5692;
*/
unsigned int rxrpc_rx_jumbo_max = 4;
+/*
+ * Time till packet resend (in jiffies).
+ */
+unsigned int rxrpc_resend_timeout = 4 * HZ;
+
const char *const rxrpc_pkts[] = {
"?00",
"DATA", "ACK", "BUSY", "ABORT", "ACKALL", "CHALL", "RESP", "DEBUG",
diff --git a/net/rxrpc/output.c b/net/rxrpc/output.c
index 817ae801e769..5b5508f6fc2a 100644
--- a/net/rxrpc/output.c
+++ b/net/rxrpc/output.c
@@ -14,299 +14,12 @@
#include <linux/net.h>
#include <linux/gfp.h>
#include <linux/skbuff.h>
-#include <linux/circ_buf.h>
#include <linux/export.h>
#include <net/sock.h>
#include <net/af_rxrpc.h>
#include "ar-internal.h"
/*
- * Time till packet resend (in jiffies).
- */
-unsigned int rxrpc_resend_timeout = 4 * HZ;
-
-static int rxrpc_send_data(struct rxrpc_sock *rx,
- struct rxrpc_call *call,
- struct msghdr *msg, size_t len);
-
-/*
- * extract control messages from the sendmsg() control buffer
- */
-static int rxrpc_sendmsg_cmsg(struct msghdr *msg,
- unsigned long *user_call_ID,
- enum rxrpc_command *command,
- u32 *abort_code,
- bool *_exclusive)
-{
- struct cmsghdr *cmsg;
- bool got_user_ID = false;
- int len;
-
- *command = RXRPC_CMD_SEND_DATA;
-
- if (msg->msg_controllen == 0)
- return -EINVAL;
-
- for_each_cmsghdr(cmsg, msg) {
- if (!CMSG_OK(msg, cmsg))
- return -EINVAL;
-
- len = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr));
- _debug("CMSG %d, %d, %d",
- cmsg->cmsg_level, cmsg->cmsg_type, len);
-
- if (cmsg->cmsg_level != SOL_RXRPC)
- continue;
-
- switch (cmsg->cmsg_type) {
- case RXRPC_USER_CALL_ID:
- if (msg->msg_flags & MSG_CMSG_COMPAT) {
- if (len != sizeof(u32))
- return -EINVAL;
- *user_call_ID = *(u32 *) CMSG_DATA(cmsg);
- } else {
- if (len != sizeof(unsigned long))
- return -EINVAL;
- *user_call_ID = *(unsigned long *)
- CMSG_DATA(cmsg);
- }
- _debug("User Call ID %lx", *user_call_ID);
- got_user_ID = true;
- break;
-
- case RXRPC_ABORT:
- if (*command != RXRPC_CMD_SEND_DATA)
- return -EINVAL;
- *command = RXRPC_CMD_SEND_ABORT;
- if (len != sizeof(*abort_code))
- return -EINVAL;
- *abort_code = *(unsigned int *) CMSG_DATA(cmsg);
- _debug("Abort %x", *abort_code);
- if (*abort_code == 0)
- return -EINVAL;
- break;
-
- case RXRPC_ACCEPT:
- if (*command != RXRPC_CMD_SEND_DATA)
- return -EINVAL;
- *command = RXRPC_CMD_ACCEPT;
- if (len != 0)
- return -EINVAL;
- break;
-
- case RXRPC_EXCLUSIVE_CALL:
- *_exclusive = true;
- if (len != 0)
- return -EINVAL;
- break;
- default:
- return -EINVAL;
- }
- }
-
- if (!got_user_ID)
- return -EINVAL;
- _leave(" = 0");
- return 0;
-}
-
-/*
- * abort a call, sending an ABORT packet to the peer
- */
-static void rxrpc_send_abort(struct rxrpc_call *call, u32 abort_code)
-{
- if (call->state >= RXRPC_CALL_COMPLETE)
- return;
-
- write_lock_bh(&call->state_lock);
-
- if (__rxrpc_abort_call(call, abort_code, ECONNABORTED)) {
- del_timer_sync(&call->resend_timer);
- del_timer_sync(&call->ack_timer);
- clear_bit(RXRPC_CALL_EV_RESEND_TIMER, &call->events);
- clear_bit(RXRPC_CALL_EV_ACK, &call->events);
- clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags);
- rxrpc_queue_call(call);
- }
-
- write_unlock_bh(&call->state_lock);
-}
-
-/*
- * Create a new client call for sendmsg().
- */
-static struct rxrpc_call *
-rxrpc_new_client_call_for_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg,
- unsigned long user_call_ID, bool exclusive)
-{
- struct rxrpc_conn_parameters cp;
- struct rxrpc_call *call;
- struct key *key;
-
- DECLARE_SOCKADDR(struct sockaddr_rxrpc *, srx, msg->msg_name);
-
- _enter("");
-
- if (!msg->msg_name)
- return ERR_PTR(-EDESTADDRREQ);
-
- key = rx->key;
- if (key && !rx->key->payload.data[0])
- key = NULL;
-
- memset(&cp, 0, sizeof(cp));
- cp.local = rx->local;
- cp.key = rx->key;
- cp.security_level = rx->min_sec_level;
- cp.exclusive = rx->exclusive | exclusive;
- cp.service_id = srx->srx_service;
- call = rxrpc_new_client_call(rx, &cp, srx, user_call_ID, GFP_KERNEL);
-
- _leave(" = %p\n", call);
- return call;
-}
-
-/*
- * 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)
-{
- enum rxrpc_command cmd;
- struct rxrpc_call *call;
- unsigned long user_call_ID = 0;
- bool exclusive = false;
- u32 abort_code = 0;
- int ret;
-
- _enter("");
-
- ret = rxrpc_sendmsg_cmsg(msg, &user_call_ID, &cmd, &abort_code,
- &exclusive);
- if (ret < 0)
- return ret;
-
- if (cmd == RXRPC_CMD_ACCEPT) {
- if (rx->sk.sk_state != RXRPC_SERVER_LISTENING)
- return -EINVAL;
- call = rxrpc_accept_call(rx, user_call_ID, NULL);
- if (IS_ERR(call))
- return PTR_ERR(call);
- rxrpc_put_call(call);
- 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);
-
-/*
* send a packet through the transport endpoint
*/
int rxrpc_send_data_packet(struct rxrpc_connection *conn, struct sk_buff *skb)
@@ -375,346 +88,3 @@ send_fragmentable:
_leave(" = %d [frag %u]", ret, conn->params.peer->maxdata);
return ret;
}
-
-/*
- * wait for space to appear in the transmit/ACK window
- * - caller holds the socket locked
- */
-static int rxrpc_wait_for_tx_window(struct rxrpc_sock *rx,
- struct rxrpc_call *call,
- long *timeo)
-{
- DECLARE_WAITQUEUE(myself, current);
- int ret;
-
- _enter(",{%d},%ld",
- CIRC_SPACE(call->acks_head, ACCESS_ONCE(call->acks_tail),
- call->acks_winsz),
- *timeo);
-
- add_wait_queue(&call->waitq, &myself);
-
- for (;;) {
- set_current_state(TASK_INTERRUPTIBLE);
- ret = 0;
- if (CIRC_SPACE(call->acks_head, ACCESS_ONCE(call->acks_tail),
- call->acks_winsz) > 0)
- break;
- if (signal_pending(current)) {
- ret = sock_intr_errno(*timeo);
- break;
- }
-
- release_sock(&rx->sk);
- *timeo = schedule_timeout(*timeo);
- lock_sock(&rx->sk);
- }
-
- remove_wait_queue(&call->waitq, &myself);
- set_current_state(TASK_RUNNING);
- _leave(" = %d", ret);
- return ret;
-}
-
-/*
- * attempt to schedule an instant Tx resend
- */
-static inline void rxrpc_instant_resend(struct rxrpc_call *call)
-{
- read_lock_bh(&call->state_lock);
- if (try_to_del_timer_sync(&call->resend_timer) >= 0) {
- clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags);
- if (call->state < RXRPC_CALL_COMPLETE &&
- !test_and_set_bit(RXRPC_CALL_EV_RESEND_TIMER, &call->events))
- rxrpc_queue_call(call);
- }
- read_unlock_bh(&call->state_lock);
-}
-
-/*
- * queue a packet for transmission, set the resend timer and attempt
- * to send the packet immediately
- */
-static void rxrpc_queue_packet(struct rxrpc_call *call, struct sk_buff *skb,
- bool last)
-{
- struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
- int ret;
-
- _net("queue skb %p [%d]", skb, call->acks_head);
-
- ASSERT(call->acks_window != NULL);
- call->acks_window[call->acks_head] = (unsigned long) skb;
- smp_wmb();
- call->acks_head = (call->acks_head + 1) & (call->acks_winsz - 1);
-
- if (last || call->state == RXRPC_CALL_SERVER_ACK_REQUEST) {
- _debug("________awaiting reply/ACK__________");
- write_lock_bh(&call->state_lock);
- switch (call->state) {
- case RXRPC_CALL_CLIENT_SEND_REQUEST:
- call->state = RXRPC_CALL_CLIENT_AWAIT_REPLY;
- break;
- case RXRPC_CALL_SERVER_ACK_REQUEST:
- call->state = RXRPC_CALL_SERVER_SEND_REPLY;
- if (!last)
- break;
- case RXRPC_CALL_SERVER_SEND_REPLY:
- call->state = RXRPC_CALL_SERVER_AWAIT_ACK;
- break;
- default:
- break;
- }
- write_unlock_bh(&call->state_lock);
- }
-
- _proto("Tx DATA %%%u { #%u }", sp->hdr.serial, sp->hdr.seq);
-
- sp->need_resend = false;
- 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;
-}
diff --git a/net/rxrpc/sendmsg.c b/net/rxrpc/sendmsg.c
new file mode 100644
index 000000000000..ff3e28ddc6d8
--- /dev/null
+++ b/net/rxrpc/sendmsg.c
@@ -0,0 +1,645 @@
+/* AF_RXRPC sendmsg() implementation.
+ *
+ * Copyright (C) 2007, 2016 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@xxxxxxxxxx)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public Licence
+ * as published by the Free Software Foundation; either version
+ * 2 of the Licence, or (at your option) any later version.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/net.h>
+#include <linux/gfp.h>
+#include <linux/skbuff.h>
+#include <linux/export.h>
+#include <linux/circ_buf.h>
+#include <net/sock.h>
+#include <net/af_rxrpc.h>
+#include "ar-internal.h"
+
+static int rxrpc_send_data(struct rxrpc_sock *rx,
+ struct rxrpc_call *call,
+ struct msghdr *msg, size_t len);
+
+/*
+ * extract control messages from the sendmsg() control buffer
+ */
+static int rxrpc_sendmsg_cmsg(struct msghdr *msg,
+ unsigned long *user_call_ID,
+ enum rxrpc_command *command,
+ u32 *abort_code,
+ bool *_exclusive)
+{
+ struct cmsghdr *cmsg;
+ bool got_user_ID = false;
+ int len;
+
+ *command = RXRPC_CMD_SEND_DATA;
+
+ if (msg->msg_controllen == 0)
+ return -EINVAL;
+
+ for_each_cmsghdr(cmsg, msg) {
+ if (!CMSG_OK(msg, cmsg))
+ return -EINVAL;
+
+ len = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr));
+ _debug("CMSG %d, %d, %d",
+ cmsg->cmsg_level, cmsg->cmsg_type, len);
+
+ if (cmsg->cmsg_level != SOL_RXRPC)
+ continue;
+
+ switch (cmsg->cmsg_type) {
+ case RXRPC_USER_CALL_ID:
+ if (msg->msg_flags & MSG_CMSG_COMPAT) {
+ if (len != sizeof(u32))
+ return -EINVAL;
+ *user_call_ID = *(u32 *) CMSG_DATA(cmsg);
+ } else {
+ if (len != sizeof(unsigned long))
+ return -EINVAL;
+ *user_call_ID = *(unsigned long *)
+ CMSG_DATA(cmsg);
+ }
+ _debug("User Call ID %lx", *user_call_ID);
+ got_user_ID = true;
+ break;
+
+ case RXRPC_ABORT:
+ if (*command != RXRPC_CMD_SEND_DATA)
+ return -EINVAL;
+ *command = RXRPC_CMD_SEND_ABORT;
+ if (len != sizeof(*abort_code))
+ return -EINVAL;
+ *abort_code = *(unsigned int *) CMSG_DATA(cmsg);
+ _debug("Abort %x", *abort_code);
+ if (*abort_code == 0)
+ return -EINVAL;
+ break;
+
+ case RXRPC_ACCEPT:
+ if (*command != RXRPC_CMD_SEND_DATA)
+ return -EINVAL;
+ *command = RXRPC_CMD_ACCEPT;
+ if (len != 0)
+ return -EINVAL;
+ break;
+
+ case RXRPC_EXCLUSIVE_CALL:
+ *_exclusive = true;
+ if (len != 0)
+ return -EINVAL;
+ break;
+ default:
+ return -EINVAL;
+ }
+ }
+
+ if (!got_user_ID)
+ return -EINVAL;
+ _leave(" = 0");
+ return 0;
+}
+
+/*
+ * abort a call, sending an ABORT packet to the peer
+ */
+static void rxrpc_send_abort(struct rxrpc_call *call, u32 abort_code)
+{
+ if (call->state >= RXRPC_CALL_COMPLETE)
+ return;
+
+ write_lock_bh(&call->state_lock);
+
+ if (__rxrpc_abort_call(call, abort_code, ECONNABORTED)) {
+ del_timer_sync(&call->resend_timer);
+ del_timer_sync(&call->ack_timer);
+ clear_bit(RXRPC_CALL_EV_RESEND_TIMER, &call->events);
+ clear_bit(RXRPC_CALL_EV_ACK, &call->events);
+ clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags);
+ rxrpc_queue_call(call);
+ }
+
+ write_unlock_bh(&call->state_lock);
+}
+
+/*
+ * Create a new client call for sendmsg().
+ */
+static struct rxrpc_call *
+rxrpc_new_client_call_for_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg,
+ unsigned long user_call_ID, bool exclusive)
+{
+ struct rxrpc_conn_parameters cp;
+ struct rxrpc_call *call;
+ struct key *key;
+
+ DECLARE_SOCKADDR(struct sockaddr_rxrpc *, srx, msg->msg_name);
+
+ _enter("");
+
+ if (!msg->msg_name)
+ return ERR_PTR(-EDESTADDRREQ);
+
+ key = rx->key;
+ if (key && !rx->key->payload.data[0])
+ key = NULL;
+
+ memset(&cp, 0, sizeof(cp));
+ cp.local = rx->local;
+ cp.key = rx->key;
+ cp.security_level = rx->min_sec_level;
+ cp.exclusive = rx->exclusive | exclusive;
+ cp.service_id = srx->srx_service;
+ call = rxrpc_new_client_call(rx, &cp, srx, user_call_ID, GFP_KERNEL);
+
+ _leave(" = %p\n", call);
+ return call;
+}
+
+/*
+ * 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)
+{
+ enum rxrpc_command cmd;
+ struct rxrpc_call *call;
+ unsigned long user_call_ID = 0;
+ bool exclusive = false;
+ u32 abort_code = 0;
+ int ret;
+
+ _enter("");
+
+ ret = rxrpc_sendmsg_cmsg(msg, &user_call_ID, &cmd, &abort_code,
+ &exclusive);
+ if (ret < 0)
+ return ret;
+
+ if (cmd == RXRPC_CMD_ACCEPT) {
+ if (rx->sk.sk_state != RXRPC_SERVER_LISTENING)
+ return -EINVAL;
+ call = rxrpc_accept_call(rx, user_call_ID, NULL);
+ if (IS_ERR(call))
+ return PTR_ERR(call);
+ rxrpc_put_call(call);
+ 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);
+
+/*
+ * wait for space to appear in the transmit/ACK window
+ * - caller holds the socket locked
+ */
+static int rxrpc_wait_for_tx_window(struct rxrpc_sock *rx,
+ struct rxrpc_call *call,
+ long *timeo)
+{
+ DECLARE_WAITQUEUE(myself, current);
+ int ret;
+
+ _enter(",{%d},%ld",
+ CIRC_SPACE(call->acks_head, ACCESS_ONCE(call->acks_tail),
+ call->acks_winsz),
+ *timeo);
+
+ add_wait_queue(&call->waitq, &myself);
+
+ for (;;) {
+ set_current_state(TASK_INTERRUPTIBLE);
+ ret = 0;
+ if (CIRC_SPACE(call->acks_head, ACCESS_ONCE(call->acks_tail),
+ call->acks_winsz) > 0)
+ break;
+ if (signal_pending(current)) {
+ ret = sock_intr_errno(*timeo);
+ break;
+ }
+
+ release_sock(&rx->sk);
+ *timeo = schedule_timeout(*timeo);
+ lock_sock(&rx->sk);
+ }
+
+ remove_wait_queue(&call->waitq, &myself);
+ set_current_state(TASK_RUNNING);
+ _leave(" = %d", ret);
+ return ret;
+}
+
+/*
+ * attempt to schedule an instant Tx resend
+ */
+static inline void rxrpc_instant_resend(struct rxrpc_call *call)
+{
+ read_lock_bh(&call->state_lock);
+ if (try_to_del_timer_sync(&call->resend_timer) >= 0) {
+ clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags);
+ if (call->state < RXRPC_CALL_COMPLETE &&
+ !test_and_set_bit(RXRPC_CALL_EV_RESEND_TIMER, &call->events))
+ rxrpc_queue_call(call);
+ }
+ read_unlock_bh(&call->state_lock);
+}
+
+/*
+ * queue a packet for transmission, set the resend timer and attempt
+ * to send the packet immediately
+ */
+static void rxrpc_queue_packet(struct rxrpc_call *call, struct sk_buff *skb,
+ bool last)
+{
+ struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
+ int ret;
+
+ _net("queue skb %p [%d]", skb, call->acks_head);
+
+ ASSERT(call->acks_window != NULL);
+ call->acks_window[call->acks_head] = (unsigned long) skb;
+ smp_wmb();
+ call->acks_head = (call->acks_head + 1) & (call->acks_winsz - 1);
+
+ if (last || call->state == RXRPC_CALL_SERVER_ACK_REQUEST) {
+ _debug("________awaiting reply/ACK__________");
+ write_lock_bh(&call->state_lock);
+ switch (call->state) {
+ case RXRPC_CALL_CLIENT_SEND_REQUEST:
+ call->state = RXRPC_CALL_CLIENT_AWAIT_REPLY;
+ break;
+ case RXRPC_CALL_SERVER_ACK_REQUEST:
+ call->state = RXRPC_CALL_SERVER_SEND_REPLY;
+ if (!last)
+ break;
+ case RXRPC_CALL_SERVER_SEND_REPLY:
+ call->state = RXRPC_CALL_SERVER_AWAIT_ACK;
+ break;
+ default:
+ break;
+ }
+ write_unlock_bh(&call->state_lock);
+ }
+
+ _proto("Tx DATA %%%u { #%u }", sp->hdr.serial, sp->hdr.seq);
+
+ sp->need_resend = false;
+ 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;
+}