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linux-2.6/net/caif/caif_socket.c

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/*
* Copyright (C) ST-Ericsson AB 2010
* Author: Sjur Brendeland sjur.brandeland@stericsson.com
* Per Sigmond per.sigmond@stericsson.com
* License terms: GNU General Public License (GPL) version 2
*/
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/spinlock.h>
#include <linux/mutex.h>
#include <linux/list.h>
#include <linux/wait.h>
#include <linux/poll.h>
#include <linux/tcp.h>
#include <linux/uaccess.h>
#include <asm/atomic.h>
#include <linux/caif/caif_socket.h>
#include <net/caif/caif_layer.h>
#include <net/caif/caif_dev.h>
#include <net/caif/cfpkt.h>
MODULE_LICENSE("GPL");
#define CHNL_SKT_READ_QUEUE_HIGH 200
#define CHNL_SKT_READ_QUEUE_LOW 100
static int caif_sockbuf_size = 40000;
static atomic_t caif_nr_socks = ATOMIC_INIT(0);
#define CONN_STATE_OPEN_BIT 1
#define CONN_STATE_PENDING_BIT 2
#define CONN_STATE_PEND_DESTROY_BIT 3
#define CONN_REMOTE_SHUTDOWN_BIT 4
#define TX_FLOW_ON_BIT 1
#define RX_FLOW_ON_BIT 2
#define STATE_IS_OPEN(cf_sk) test_bit(CONN_STATE_OPEN_BIT,\
(void *) &(cf_sk)->conn_state)
#define STATE_IS_REMOTE_SHUTDOWN(cf_sk) test_bit(CONN_REMOTE_SHUTDOWN_BIT,\
(void *) &(cf_sk)->conn_state)
#define STATE_IS_PENDING(cf_sk) test_bit(CONN_STATE_PENDING_BIT,\
(void *) &(cf_sk)->conn_state)
#define STATE_IS_PENDING_DESTROY(cf_sk) test_bit(CONN_STATE_PEND_DESTROY_BIT,\
(void *) &(cf_sk)->conn_state)
#define SET_STATE_PENDING_DESTROY(cf_sk) set_bit(CONN_STATE_PEND_DESTROY_BIT,\
(void *) &(cf_sk)->conn_state)
#define SET_STATE_OPEN(cf_sk) set_bit(CONN_STATE_OPEN_BIT,\
(void *) &(cf_sk)->conn_state)
#define SET_STATE_CLOSED(cf_sk) clear_bit(CONN_STATE_OPEN_BIT,\
(void *) &(cf_sk)->conn_state)
#define SET_PENDING_ON(cf_sk) set_bit(CONN_STATE_PENDING_BIT,\
(void *) &(cf_sk)->conn_state)
#define SET_PENDING_OFF(cf_sk) clear_bit(CONN_STATE_PENDING_BIT,\
(void *) &(cf_sk)->conn_state)
#define SET_REMOTE_SHUTDOWN(cf_sk) set_bit(CONN_REMOTE_SHUTDOWN_BIT,\
(void *) &(cf_sk)->conn_state)
#define SET_REMOTE_SHUTDOWN_OFF(dev) clear_bit(CONN_REMOTE_SHUTDOWN_BIT,\
(void *) &(dev)->conn_state)
#define RX_FLOW_IS_ON(cf_sk) test_bit(RX_FLOW_ON_BIT,\
(void *) &(cf_sk)->flow_state)
#define TX_FLOW_IS_ON(cf_sk) test_bit(TX_FLOW_ON_BIT,\
(void *) &(cf_sk)->flow_state)
#define SET_RX_FLOW_OFF(cf_sk) clear_bit(RX_FLOW_ON_BIT,\
(void *) &(cf_sk)->flow_state)
#define SET_RX_FLOW_ON(cf_sk) set_bit(RX_FLOW_ON_BIT,\
(void *) &(cf_sk)->flow_state)
#define SET_TX_FLOW_OFF(cf_sk) clear_bit(TX_FLOW_ON_BIT,\
(void *) &(cf_sk)->flow_state)
#define SET_TX_FLOW_ON(cf_sk) set_bit(TX_FLOW_ON_BIT,\
(void *) &(cf_sk)->flow_state)
#define SKT_READ_FLAG 0x01
#define SKT_WRITE_FLAG 0x02
static struct dentry *debugfsdir;
#include <linux/debugfs.h>
#ifdef CONFIG_DEBUG_FS
struct debug_fs_counter {
atomic_t num_open;
atomic_t num_close;
atomic_t num_init;
atomic_t num_init_resp;
atomic_t num_init_fail_resp;
atomic_t num_deinit;
atomic_t num_deinit_resp;
atomic_t num_remote_shutdown_ind;
atomic_t num_tx_flow_off_ind;
atomic_t num_tx_flow_on_ind;
atomic_t num_rx_flow_off;
atomic_t num_rx_flow_on;
atomic_t skb_in_use;
atomic_t skb_alloc;
atomic_t skb_free;
};
static struct debug_fs_counter cnt;
#define dbfs_atomic_inc(v) atomic_inc(v)
#define dbfs_atomic_dec(v) atomic_dec(v)
#else
#define dbfs_atomic_inc(v)
#define dbfs_atomic_dec(v)
#endif
/* The AF_CAIF socket */
struct caifsock {
/* NOTE: sk has to be the first member */
struct sock sk;
struct cflayer layer;
char name[CAIF_LAYER_NAME_SZ];
u32 conn_state;
u32 flow_state;
struct cfpktq *pktq;
int file_mode;
struct caif_connect_request conn_req;
int read_queue_len;
/* protect updates of read_queue_len */
spinlock_t read_queue_len_lock;
struct dentry *debugfs_socket_dir;
};
static void drain_queue(struct caifsock *cf_sk);
/* Packet Receive Callback function called from CAIF Stack */
static int caif_sktrecv_cb(struct cflayer *layr, struct cfpkt *pkt)
{
struct caifsock *cf_sk;
int read_queue_high;
cf_sk = container_of(layr, struct caifsock, layer);
if (!STATE_IS_OPEN(cf_sk)) {
/*FIXME: This should be allowed finally!*/
pr_debug("CAIF: %s(): called after close request\n", __func__);
cfpkt_destroy(pkt);
return 0;
}
/* NOTE: This function may be called in Tasklet context! */
/* The queue has its own lock */
cfpkt_queue(cf_sk->pktq, pkt, 0);
spin_lock(&cf_sk->read_queue_len_lock);
cf_sk->read_queue_len++;
read_queue_high = (cf_sk->read_queue_len > CHNL_SKT_READ_QUEUE_HIGH);
spin_unlock(&cf_sk->read_queue_len_lock);
if (RX_FLOW_IS_ON(cf_sk) && read_queue_high) {
dbfs_atomic_inc(&cnt.num_rx_flow_off);
SET_RX_FLOW_OFF(cf_sk);
/* Send flow off (NOTE: must not sleep) */
pr_debug("CAIF: %s():"
" sending flow OFF (queue len = %d)\n",
__func__,
cf_sk->read_queue_len);
caif_assert(cf_sk->layer.dn);
caif_assert(cf_sk->layer.dn->ctrlcmd);
(void) cf_sk->layer.dn->modemcmd(cf_sk->layer.dn,
CAIF_MODEMCMD_FLOW_OFF_REQ);
}
/* Signal reader that data is available. */
wake_up_interruptible(cf_sk->sk.sk_sleep);
return 0;
}
/* Packet Flow Control Callback function called from CAIF */
static void caif_sktflowctrl_cb(struct cflayer *layr,
enum caif_ctrlcmd flow,
int phyid)
{
struct caifsock *cf_sk;
/* NOTE: This function may be called in Tasklet context! */
pr_debug("CAIF: %s(): flowctrl func called: %s.\n",
__func__,
flow == CAIF_CTRLCMD_FLOW_ON_IND ? "ON" :
flow == CAIF_CTRLCMD_FLOW_OFF_IND ? "OFF" :
flow == CAIF_CTRLCMD_INIT_RSP ? "INIT_RSP" :
flow == CAIF_CTRLCMD_DEINIT_RSP ? "DEINIT_RSP" :
flow == CAIF_CTRLCMD_INIT_FAIL_RSP ? "INIT_FAIL_RSP" :
flow ==
CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND ? "REMOTE_SHUTDOWN" :
"UKNOWN CTRL COMMAND");
if (layr == NULL)
return;
cf_sk = container_of(layr, struct caifsock, layer);
switch (flow) {
case CAIF_CTRLCMD_FLOW_ON_IND:
dbfs_atomic_inc(&cnt.num_tx_flow_on_ind);
/* Signal reader that data is available. */
SET_TX_FLOW_ON(cf_sk);
wake_up_interruptible(cf_sk->sk.sk_sleep);
break;
case CAIF_CTRLCMD_FLOW_OFF_IND:
dbfs_atomic_inc(&cnt.num_tx_flow_off_ind);
SET_TX_FLOW_OFF(cf_sk);
break;
case CAIF_CTRLCMD_INIT_RSP:
dbfs_atomic_inc(&cnt.num_init_resp);
/* Signal reader that data is available. */
caif_assert(STATE_IS_OPEN(cf_sk));
SET_PENDING_OFF(cf_sk);
SET_TX_FLOW_ON(cf_sk);
wake_up_interruptible(cf_sk->sk.sk_sleep);
break;
case CAIF_CTRLCMD_DEINIT_RSP:
dbfs_atomic_inc(&cnt.num_deinit_resp);
caif_assert(!STATE_IS_OPEN(cf_sk));
SET_PENDING_OFF(cf_sk);
if (!STATE_IS_PENDING_DESTROY(cf_sk)) {
if (cf_sk->sk.sk_sleep != NULL)
wake_up_interruptible(cf_sk->sk.sk_sleep);
}
dbfs_atomic_inc(&cnt.num_deinit);
sock_put(&cf_sk->sk);
break;
case CAIF_CTRLCMD_INIT_FAIL_RSP:
dbfs_atomic_inc(&cnt.num_init_fail_resp);
caif_assert(STATE_IS_OPEN(cf_sk));
SET_STATE_CLOSED(cf_sk);
SET_PENDING_OFF(cf_sk);
SET_TX_FLOW_OFF(cf_sk);
wake_up_interruptible(cf_sk->sk.sk_sleep);
break;
case CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND:
dbfs_atomic_inc(&cnt.num_remote_shutdown_ind);
SET_REMOTE_SHUTDOWN(cf_sk);
/* Use sk_shutdown to indicate remote shutdown indication */
cf_sk->sk.sk_shutdown |= RCV_SHUTDOWN;
cf_sk->file_mode = 0;
wake_up_interruptible(cf_sk->sk.sk_sleep);
break;
default:
pr_debug("CAIF: %s(): Unexpected flow command %d\n",
__func__, flow);
}
}
static void skb_destructor(struct sk_buff *skb)
{
dbfs_atomic_inc(&cnt.skb_free);
dbfs_atomic_dec(&cnt.skb_in_use);
}
static int caif_recvmsg(struct kiocb *iocb, struct socket *sock,
struct msghdr *m, size_t buf_len, int flags)
{
struct sock *sk = sock->sk;
struct caifsock *cf_sk = container_of(sk, struct caifsock, sk);
struct cfpkt *pkt = NULL;
size_t len;
int result;
struct sk_buff *skb;
ssize_t ret = -EIO;
int read_queue_low;
if (cf_sk == NULL) {
pr_debug("CAIF: %s(): private_data not set!\n",
__func__);
ret = -EBADFD;
goto read_error;
}
/* Don't do multiple iovec entries yet */
if (m->msg_iovlen != 1)
return -EOPNOTSUPP;
if (unlikely(!buf_len))
return -EINVAL;
lock_sock(&(cf_sk->sk));
caif_assert(cf_sk->pktq);
if (!STATE_IS_OPEN(cf_sk)) {
/* Socket is closed or closing. */
if (!STATE_IS_PENDING(cf_sk)) {
pr_debug("CAIF: %s(): socket is closed (by remote)\n",
__func__);
ret = -EPIPE;
} else {
pr_debug("CAIF: %s(): socket is closing..\n", __func__);
ret = -EBADF;
}
goto read_error;
}
/* Socket is open or opening. */
if (STATE_IS_PENDING(cf_sk)) {
pr_debug("CAIF: %s(): socket is opening...\n", __func__);
if (flags & MSG_DONTWAIT) {
/* We can't block. */
pr_debug("CAIF: %s():state pending and MSG_DONTWAIT\n",
__func__);
ret = -EAGAIN;
goto read_error;
}
/*
* Blocking mode; state is pending and we need to wait
* for its conclusion.
*/
release_sock(&cf_sk->sk);
result =
wait_event_interruptible(*cf_sk->sk.sk_sleep,
!STATE_IS_PENDING(cf_sk));
lock_sock(&(cf_sk->sk));
if (result == -ERESTARTSYS) {
pr_debug("CAIF: %s(): wait_event_interruptible"
" woken by a signal (1)", __func__);
ret = -ERESTARTSYS;
goto read_error;
}
}
if (STATE_IS_REMOTE_SHUTDOWN(cf_sk) ||
!STATE_IS_OPEN(cf_sk) ||
STATE_IS_PENDING(cf_sk)) {
pr_debug("CAIF: %s(): socket closed\n",
__func__);
ret = -ESHUTDOWN;
goto read_error;
}
/*
* Block if we don't have any received buffers.
* The queue has its own lock.
*/
while ((pkt = cfpkt_qpeek(cf_sk->pktq)) == NULL) {
if (flags & MSG_DONTWAIT) {
pr_debug("CAIF: %s(): MSG_DONTWAIT\n", __func__);
ret = -EAGAIN;
goto read_error;
}
trace_printk("CAIF: %s() wait_event\n", __func__);
/* Let writers in. */
release_sock(&cf_sk->sk);
/* Block reader until data arrives or socket is closed. */
if (wait_event_interruptible(*cf_sk->sk.sk_sleep,
cfpkt_qpeek(cf_sk->pktq)
|| STATE_IS_REMOTE_SHUTDOWN(cf_sk)
|| !STATE_IS_OPEN(cf_sk)) ==
-ERESTARTSYS) {
pr_debug("CAIF: %s():"
" wait_event_interruptible woken by "
"a signal, signal_pending(current) = %d\n",
__func__,
signal_pending(current));
return -ERESTARTSYS;
}
trace_printk("CAIF: %s() awake\n", __func__);
if (STATE_IS_REMOTE_SHUTDOWN(cf_sk)) {
pr_debug("CAIF: %s(): "
"received remote_shutdown indication\n",
__func__);
ret = -ESHUTDOWN;
goto read_error_no_unlock;
}
/* I want to be alone on cf_sk (except status and queue). */
lock_sock(&(cf_sk->sk));
if (!STATE_IS_OPEN(cf_sk)) {
/* Someone closed the link, report error. */
pr_debug("CAIF: %s(): remote end shutdown!\n",
__func__);
ret = -EPIPE;
goto read_error;
}
}
/* The queue has its own lock. */
len = cfpkt_getlen(pkt);
/* Check max length that can be copied. */
if (len <= buf_len)
pkt = cfpkt_dequeue(cf_sk->pktq);
else {
pr_debug("CAIF: %s(): user buffer too small (%ld,%ld)\n",
__func__, (long) len, (long) buf_len);
if (sock->type == SOCK_SEQPACKET) {
ret = -EMSGSIZE;
goto read_error;
}
len = buf_len;
}
spin_lock(&cf_sk->read_queue_len_lock);
cf_sk->read_queue_len--;
read_queue_low = (cf_sk->read_queue_len < CHNL_SKT_READ_QUEUE_LOW);
spin_unlock(&cf_sk->read_queue_len_lock);
if (!RX_FLOW_IS_ON(cf_sk) && read_queue_low) {
dbfs_atomic_inc(&cnt.num_rx_flow_on);
SET_RX_FLOW_ON(cf_sk);
/* Send flow on. */
pr_debug("CAIF: %s(): sending flow ON (queue len = %d)\n",
__func__, cf_sk->read_queue_len);
caif_assert(cf_sk->layer.dn);
caif_assert(cf_sk->layer.dn->ctrlcmd);
(void) cf_sk->layer.dn->modemcmd(cf_sk->layer.dn,
CAIF_MODEMCMD_FLOW_ON_REQ);
caif_assert(cf_sk->read_queue_len >= 0);
}
skb = cfpkt_tonative(pkt);
result = skb_copy_datagram_iovec(skb, 0, m->msg_iov, len);
skb_pull(skb, len);
if (result) {
pr_debug("CAIF: %s(): copy to_iovec failed\n", __func__);
cfpkt_destroy(pkt);
ret = -EFAULT;
goto read_error;
}
/* Free packet and remove from queue */
if (skb->len == 0)
skb_free_datagram(sk, skb);
/* Let the others in. */
release_sock(&cf_sk->sk);
return len;
read_error:
release_sock(&cf_sk->sk);
read_error_no_unlock:
return ret;
}
/* Send a signal as a consequence of sendmsg, sendto or caif_sendmsg. */
static int caif_sendmsg(struct kiocb *kiocb, struct socket *sock,
struct msghdr *msg, size_t len)
{
struct sock *sk = sock->sk;
struct caifsock *cf_sk = container_of(sk, struct caifsock, sk);
size_t payload_size = msg->msg_iov->iov_len;
struct cfpkt *pkt = NULL;
struct caif_payload_info info;
unsigned char *txbuf;
ssize_t ret = -EIO;
int result;
struct sk_buff *skb;
caif_assert(msg->msg_iovlen == 1);
if (cf_sk == NULL) {
pr_debug("CAIF: %s(): private_data not set!\n",
__func__);
ret = -EBADFD;
goto write_error_no_unlock;
}
if (unlikely(msg->msg_iov->iov_base == NULL)) {
pr_warning("CAIF: %s(): Buffer is NULL.\n", __func__);
ret = -EINVAL;
goto write_error_no_unlock;
}
if (payload_size > CAIF_MAX_PAYLOAD_SIZE) {
pr_debug("CAIF: %s(): buffer too long\n", __func__);
if (sock->type == SOCK_SEQPACKET) {
ret = -EINVAL;
goto write_error_no_unlock;
}
payload_size = CAIF_MAX_PAYLOAD_SIZE;
}
/* I want to be alone on cf_sk (except status and queue) */
lock_sock(&(cf_sk->sk));
caif_assert(cf_sk->pktq);
if (!STATE_IS_OPEN(cf_sk)) {
/* Socket is closed or closing */
if (!STATE_IS_PENDING(cf_sk)) {
pr_debug("CAIF: %s(): socket is closed (by remote)\n",
__func__);
ret = -EPIPE;
} else {
pr_debug("CAIF: %s(): socket is closing...\n",
__func__);
ret = -EBADF;
}
goto write_error;
}
/* Socket is open or opening */
if (STATE_IS_PENDING(cf_sk)) {
pr_debug("CAIF: %s(): socket is opening...\n", __func__);
if (msg->msg_flags & MSG_DONTWAIT) {
/* We can't block */
trace_printk("CAIF: %s():state pending:"
"state=MSG_DONTWAIT\n", __func__);
ret = -EAGAIN;
goto write_error;
}
/* Let readers in */
release_sock(&cf_sk->sk);
/*
* Blocking mode; state is pending and we need to wait
* for its conclusion.
*/
result =
wait_event_interruptible(*cf_sk->sk.sk_sleep,
!STATE_IS_PENDING(cf_sk));
/* I want to be alone on cf_sk (except status and queue) */
lock_sock(&(cf_sk->sk));
if (result == -ERESTARTSYS) {
pr_debug("CAIF: %s(): wait_event_interruptible"
" woken by a signal (1)", __func__);
ret = -ERESTARTSYS;
goto write_error;
}
}
if (STATE_IS_REMOTE_SHUTDOWN(cf_sk) ||
!STATE_IS_OPEN(cf_sk) ||
STATE_IS_PENDING(cf_sk)) {
pr_debug("CAIF: %s(): socket closed\n",
__func__);
ret = -ESHUTDOWN;
goto write_error;
}
if (!TX_FLOW_IS_ON(cf_sk)) {
/* Flow is off. Check non-block flag */
if (msg->msg_flags & MSG_DONTWAIT) {
trace_printk("CAIF: %s(): MSG_DONTWAIT and tx flow off",
__func__);
ret = -EAGAIN;
goto write_error;
}
/* release lock before waiting */
release_sock(&cf_sk->sk);
/* Wait until flow is on or socket is closed */
if (wait_event_interruptible(*cf_sk->sk.sk_sleep,
TX_FLOW_IS_ON(cf_sk)
|| !STATE_IS_OPEN(cf_sk)
|| STATE_IS_REMOTE_SHUTDOWN(cf_sk)
) == -ERESTARTSYS) {
pr_debug("CAIF: %s():"
" wait_event_interruptible woken by a signal",
__func__);
ret = -ERESTARTSYS;
goto write_error_no_unlock;
}
/* I want to be alone on cf_sk (except status and queue) */
lock_sock(&(cf_sk->sk));
if (!STATE_IS_OPEN(cf_sk)) {
/* someone closed the link, report error */
pr_debug("CAIF: %s(): remote end shutdown!\n",
__func__);
ret = -EPIPE;
goto write_error;
}
if (STATE_IS_REMOTE_SHUTDOWN(cf_sk)) {
pr_debug("CAIF: %s(): "
"received remote_shutdown indication\n",
__func__);
ret = -ESHUTDOWN;
goto write_error;
}
}
pkt = cfpkt_create(payload_size);
skb = (struct sk_buff *)pkt;
skb->destructor = skb_destructor;
skb->sk = sk;
dbfs_atomic_inc(&cnt.skb_alloc);
dbfs_atomic_inc(&cnt.skb_in_use);
if (cfpkt_raw_append(pkt, (void **) &txbuf, payload_size) < 0) {
pr_debug("CAIF: %s(): cfpkt_raw_append failed\n", __func__);
cfpkt_destroy(pkt);
ret = -EINVAL;
goto write_error;
}
/* Copy data into buffer. */
if (copy_from_user(txbuf, msg->msg_iov->iov_base, payload_size)) {
pr_debug("CAIF: %s(): copy_from_user returned non zero.\n",
__func__);
cfpkt_destroy(pkt);
ret = -EINVAL;
goto write_error;
}
memset(&info, 0, sizeof(info));
/* Send the packet down the stack. */
caif_assert(cf_sk->layer.dn);
caif_assert(cf_sk->layer.dn->transmit);
do {
ret = cf_sk->layer.dn->transmit(cf_sk->layer.dn, pkt);
if (likely((ret >= 0) || (ret != -EAGAIN)))
break;
/* EAGAIN - retry */
if (msg->msg_flags & MSG_DONTWAIT) {
pr_debug("CAIF: %s(): NONBLOCK and transmit failed,"
" error = %ld\n", __func__, (long) ret);
ret = -EAGAIN;
goto write_error;
}
/* Let readers in */
release_sock(&cf_sk->sk);
/* Wait until flow is on or socket is closed */
if (wait_event_interruptible(*cf_sk->sk.sk_sleep,
TX_FLOW_IS_ON(cf_sk)
|| !STATE_IS_OPEN(cf_sk)
|| STATE_IS_REMOTE_SHUTDOWN(cf_sk)
) == -ERESTARTSYS) {
pr_debug("CAIF: %s(): wait_event_interruptible"
" woken by a signal", __func__);
ret = -ERESTARTSYS;
goto write_error_no_unlock;
}
/* I want to be alone on cf_sk (except status and queue) */
lock_sock(&(cf_sk->sk));
} while (ret == -EAGAIN);
if (ret < 0) {
cfpkt_destroy(pkt);
pr_debug("CAIF: %s(): transmit failed, error = %ld\n",
__func__, (long) ret);
goto write_error;
}
release_sock(&cf_sk->sk);
return payload_size;
write_error:
release_sock(&cf_sk->sk);
write_error_no_unlock:
return ret;
}
static unsigned int caif_poll(struct file *file, struct socket *sock,
poll_table *wait)
{
struct sock *sk = sock->sk;
struct caifsock *cf_sk = container_of(sk, struct caifsock, sk);
u32 mask = 0;
poll_wait(file, sk_sleep(sk), wait);
lock_sock(&(cf_sk->sk));
if (!STATE_IS_OPEN(cf_sk)) {
if (!STATE_IS_PENDING(cf_sk))
mask |= POLLHUP;
} else {
if (cfpkt_qpeek(cf_sk->pktq) != NULL)
mask |= (POLLIN | POLLRDNORM);
if (TX_FLOW_IS_ON(cf_sk))
mask |= (POLLOUT | POLLWRNORM);
}
release_sock(&cf_sk->sk);
trace_printk("CAIF: %s(): poll mask=0x%04x\n",
__func__, mask);
return mask;
}
static void drain_queue(struct caifsock *cf_sk)
{
struct cfpkt *pkt = NULL;
/* Empty the queue */
do {
/* The queue has its own lock */
if (!cf_sk->pktq)
break;
pkt = cfpkt_dequeue(cf_sk->pktq);
if (!pkt)
break;
pr_debug("CAIF: %s(): freeing packet from read queue\n",
__func__);
cfpkt_destroy(pkt);
} while (1);
cf_sk->read_queue_len = 0;
}
static int setsockopt(struct socket *sock,
int lvl, int opt, char __user *ov, unsigned int ol)
{
struct sock *sk = sock->sk;
struct caifsock *cf_sk = container_of(sk, struct caifsock, sk);
int prio, linksel;
struct ifreq ifreq;
if (STATE_IS_OPEN(cf_sk)) {
pr_debug("CAIF: %s(): setsockopt "
"cannot be done on a connected socket\n",
__func__);
return -ENOPROTOOPT;
}
switch (opt) {
case CAIFSO_LINK_SELECT:
if (ol < sizeof(int)) {
pr_debug("CAIF: %s(): setsockopt"
" CAIFSO_CHANNEL_CONFIG bad size\n", __func__);
return -EINVAL;
}
if (lvl != SOL_CAIF)
goto bad_sol;
if (copy_from_user(&linksel, ov, sizeof(int)))
return -EINVAL;
lock_sock(&(cf_sk->sk));
cf_sk->conn_req.link_selector = linksel;
release_sock(&cf_sk->sk);
return 0;
case SO_PRIORITY:
if (lvl != SOL_SOCKET)
goto bad_sol;
if (ol < sizeof(int)) {
pr_debug("CAIF: %s(): setsockopt"
" SO_PRIORITY bad size\n", __func__);
return -EINVAL;
}
if (copy_from_user(&prio, ov, sizeof(int)))
return -EINVAL;
lock_sock(&(cf_sk->sk));
cf_sk->conn_req.priority = prio;
pr_debug("CAIF: %s(): Setting sockopt priority=%d\n", __func__,
cf_sk->conn_req.priority);
release_sock(&cf_sk->sk);
return 0;
case SO_BINDTODEVICE:
if (lvl != SOL_SOCKET)
goto bad_sol;
if (ol < sizeof(struct ifreq)) {
pr_debug("CAIF: %s(): setsockopt"
" SO_PRIORITY bad size\n", __func__);
return -EINVAL;
}
if (copy_from_user(&ifreq, ov, sizeof(ifreq)))
return -EFAULT;
lock_sock(&(cf_sk->sk));
strncpy(cf_sk->conn_req.link_name, ifreq.ifr_name,
sizeof(cf_sk->conn_req.link_name));
cf_sk->conn_req.link_name
[sizeof(cf_sk->conn_req.link_name)-1] = 0;
release_sock(&cf_sk->sk);
return 0;
case CAIFSO_REQ_PARAM:
if (lvl != SOL_CAIF)
goto bad_sol;
if (cf_sk->sk.sk_protocol != CAIFPROTO_UTIL)
return -ENOPROTOOPT;
if (ol > sizeof(cf_sk->conn_req.param.data))
goto req_param_bad_size;
lock_sock(&(cf_sk->sk));
cf_sk->conn_req.param.size = ol;
if (copy_from_user(&cf_sk->conn_req.param.data, ov, ol)) {
release_sock(&cf_sk->sk);
req_param_bad_size:
pr_debug("CAIF: %s(): setsockopt"
" CAIFSO_CHANNEL_CONFIG bad size\n", __func__);
return -EINVAL;
}
release_sock(&cf_sk->sk);
return 0;
default:
pr_debug("CAIF: %s(): unhandled option %d\n", __func__, opt);
return -EINVAL;
}
return 0;
bad_sol:
pr_debug("CAIF: %s(): setsockopt bad level\n", __func__);
return -ENOPROTOOPT;
}
static int caif_connect(struct socket *sock, struct sockaddr *uservaddr,
int sockaddr_len, int flags)
{
struct caifsock *cf_sk = NULL;
int result = -1;
int mode = 0;
int ret = -EIO;
struct sock *sk = sock->sk;
BUG_ON(sk == NULL);
cf_sk = container_of(sk, struct caifsock, sk);
trace_printk("CAIF: %s(): cf_sk=%p OPEN=%d, TX_FLOW=%d, RX_FLOW=%d\n",
__func__, cf_sk,
STATE_IS_OPEN(cf_sk),
TX_FLOW_IS_ON(cf_sk), RX_FLOW_IS_ON(cf_sk));
if (sock->type == SOCK_SEQPACKET || sock->type == SOCK_STREAM)
sock->state = SS_CONNECTING;
else
goto out;
/* I want to be alone on cf_sk (except status and queue) */
lock_sock(&(cf_sk->sk));
if (sockaddr_len != sizeof(struct sockaddr_caif)) {
pr_debug("CAIF: %s(): Bad address len (%ld,%lu)\n",
__func__, (long) sockaddr_len,
(long unsigned) sizeof(struct sockaddr_caif));
ret = -EINVAL;
goto open_error;
}
if (uservaddr->sa_family != AF_CAIF) {
pr_debug("CAIF: %s(): Bad address family (%d)\n",
__func__, uservaddr->sa_family);
ret = -EAFNOSUPPORT;
goto open_error;
}
memcpy(&cf_sk->conn_req.sockaddr, uservaddr,
sizeof(struct sockaddr_caif));
dbfs_atomic_inc(&cnt.num_open);
mode = SKT_READ_FLAG | SKT_WRITE_FLAG;
/* If socket is not open, make sure socket is in fully closed state */
if (!STATE_IS_OPEN(cf_sk)) {
/* Has link close response been received (if we ever sent it)?*/
if (STATE_IS_PENDING(cf_sk)) {
/*
* Still waiting for close response from remote.
* If opened non-blocking, report "would block"
*/
if (flags & O_NONBLOCK) {
pr_debug("CAIF: %s(): O_NONBLOCK"
" && close pending\n", __func__);
ret = -EAGAIN;
goto open_error;
}
pr_debug("CAIF: %s(): Wait for close response"
" from remote...\n", __func__);
release_sock(&cf_sk->sk);
/*
* Blocking mode; close is pending and we need to wait
* for its conclusion.
*/
result =
wait_event_interruptible(*cf_sk->sk.sk_sleep,
!STATE_IS_PENDING(cf_sk));
lock_sock(&(cf_sk->sk));
if (result == -ERESTARTSYS) {
pr_debug("CAIF: %s(): wait_event_interruptible"
"woken by a signal (1)", __func__);
ret = -ERESTARTSYS;
goto open_error;
}
}
}
/* socket is now either closed, pending open or open */
if (STATE_IS_OPEN(cf_sk) && !STATE_IS_PENDING(cf_sk)) {
/* Open */
pr_debug("CAIF: %s(): Socket is already opened (cf_sk=%p)"
" check access f_flags = 0x%x file_mode = 0x%x\n",
__func__, cf_sk, mode, cf_sk->file_mode);
} else {
/* We are closed or pending open.
* If closed: send link setup
* If pending open: link setup already sent (we could have been
* interrupted by a signal last time)
*/
if (!STATE_IS_OPEN(cf_sk)) {
/* First opening of file; connect lower layers: */
/* Drain queue (very unlikely) */
drain_queue(cf_sk);
cf_sk->layer.receive = caif_sktrecv_cb;
SET_STATE_OPEN(cf_sk);
SET_PENDING_ON(cf_sk);
/* Register this channel. */
result =
caif_connect_client(&cf_sk->conn_req,
&cf_sk->layer);
if (result < 0) {
pr_debug("CAIF: %s(): can't register channel\n",
__func__);
ret = -EIO;
SET_STATE_CLOSED(cf_sk);
SET_PENDING_OFF(cf_sk);
goto open_error;
}
dbfs_atomic_inc(&cnt.num_init);
}
/* If opened non-blocking, report "success".
*/
if (flags & O_NONBLOCK) {
pr_debug("CAIF: %s(): O_NONBLOCK success\n",
__func__);
ret = -EINPROGRESS;
cf_sk->sk.sk_err = -EINPROGRESS;
goto open_error;
}
trace_printk("CAIF: %s(): Wait for connect response\n",
__func__);
/* release lock before waiting */
release_sock(&cf_sk->sk);
result =
wait_event_interruptible(*cf_sk->sk.sk_sleep,
!STATE_IS_PENDING(cf_sk));
lock_sock(&(cf_sk->sk));
if (result == -ERESTARTSYS) {
pr_debug("CAIF: %s(): wait_event_interruptible"
"woken by a signal (2)", __func__);
ret = -ERESTARTSYS;
goto open_error;
}
if (!STATE_IS_OPEN(cf_sk)) {
/* Lower layers said "no" */
pr_debug("CAIF: %s(): Closed received\n", __func__);
ret = -EPIPE;
goto open_error;
}
trace_printk("CAIF: %s(): Connect received\n", __func__);
}
/* Open is ok */
cf_sk->file_mode |= mode;
trace_printk("CAIF: %s(): Connected - file mode = %x\n",
__func__, cf_sk->file_mode);
release_sock(&cf_sk->sk);
return 0;
open_error:
sock->state = SS_UNCONNECTED;
release_sock(&cf_sk->sk);
out:
return ret;
}
static int caif_shutdown(struct socket *sock, int how)
{
struct caifsock *cf_sk = NULL;
int result = 0;
int tx_flow_state_was_on;
struct sock *sk = sock->sk;
trace_printk("CAIF: %s(): enter\n", __func__);
pr_debug("f_flags=%x\n", sock->file->f_flags);
if (how != SHUT_RDWR)
return -EOPNOTSUPP;
cf_sk = container_of(sk, struct caifsock, sk);
if (cf_sk == NULL) {
pr_debug("CAIF: %s(): COULD NOT FIND SOCKET\n", __func__);
return -EBADF;
}
/* I want to be alone on cf_sk (except status queue) */
lock_sock(&(cf_sk->sk));
sock_hold(&cf_sk->sk);
/* IS_CLOSED have double meaning:
* 1) Spontanous Remote Shutdown Request.
* 2) Ack on a channel teardown(disconnect)
* Must clear bit in case we previously received
* remote shudown request.
*/
if (STATE_IS_OPEN(cf_sk) && !STATE_IS_PENDING(cf_sk)) {
SET_STATE_CLOSED(cf_sk);
SET_PENDING_ON(cf_sk);
tx_flow_state_was_on = TX_FLOW_IS_ON(cf_sk);
SET_TX_FLOW_OFF(cf_sk);
/* Hold the socket until DEINIT_RSP is received */
sock_hold(&cf_sk->sk);
result = caif_disconnect_client(&cf_sk->layer);
if (result < 0) {
pr_debug("CAIF: %s(): "
"caif_disconnect_client() failed\n",
__func__);
SET_STATE_CLOSED(cf_sk);
SET_PENDING_OFF(cf_sk);
SET_TX_FLOW_OFF(cf_sk);
release_sock(&cf_sk->sk);
sock_put(&cf_sk->sk);
return -EIO;
}
}
if (STATE_IS_REMOTE_SHUTDOWN(cf_sk)) {
SET_PENDING_OFF(cf_sk);
SET_REMOTE_SHUTDOWN_OFF(cf_sk);
}
/*
* Socket is no longer in state pending close,
* and we can release the reference.
*/
dbfs_atomic_inc(&cnt.num_close);
drain_queue(cf_sk);
SET_RX_FLOW_ON(cf_sk);
cf_sk->file_mode = 0;
sock_put(&cf_sk->sk);
release_sock(&cf_sk->sk);
if (!result && (sock->file->f_flags & O_NONBLOCK)) {
pr_debug("nonblocking shutdown returing -EAGAIN\n");
return -EAGAIN;
} else
return result;
}
static ssize_t caif_sock_no_sendpage(struct socket *sock,
struct page *page,
int offset, size_t size, int flags)
{
return -EOPNOTSUPP;
}
/* This function is called as part of close. */
static int caif_release(struct socket *sock)
{
struct sock *sk = sock->sk;
struct caifsock *cf_sk = NULL;
int res;
caif_assert(sk != NULL);
cf_sk = container_of(sk, struct caifsock, sk);
if (cf_sk->debugfs_socket_dir != NULL)
debugfs_remove_recursive(cf_sk->debugfs_socket_dir);
res = caif_shutdown(sock, SHUT_RDWR);
if (res && res != -EINPROGRESS)
return res;
/*
* FIXME: Shutdown should probably be possible to do async
* without flushing queues, allowing reception of frames while
* waiting for DEINIT_IND.
* Release should always block, to allow secure decoupling of
* CAIF stack.
*/
if (!(sock->file->f_flags & O_NONBLOCK)) {
res = wait_event_interruptible(*cf_sk->sk.sk_sleep,
!STATE_IS_PENDING(cf_sk));
if (res == -ERESTARTSYS) {
pr_debug("CAIF: %s(): wait_event_interruptible"
"woken by a signal (1)", __func__);
}
}
lock_sock(&(cf_sk->sk));
sock->sk = NULL;
/* Detach the socket from its process context by making it orphan. */
sock_orphan(sk);
/*
* Setting SHUTDOWN_MASK means that both send and receive are shutdown
* for the socket.
*/
sk->sk_shutdown = SHUTDOWN_MASK;
/*
* Set the socket state to closed, the TCP_CLOSE macro is used when
* closing any socket.
*/
/* Flush out this sockets receive queue. */
drain_queue(cf_sk);
/* Finally release the socket. */
SET_STATE_PENDING_DESTROY(cf_sk);
release_sock(&cf_sk->sk);
sock_put(sk);
/*
* The rest of the cleanup will be handled from the
* caif_sock_destructor
*/
return res;
}
static const struct proto_ops caif_ops = {
.family = PF_CAIF,
.owner = THIS_MODULE,
.release = caif_release,
.bind = sock_no_bind,
.connect = caif_connect,
.socketpair = sock_no_socketpair,
.accept = sock_no_accept,
.getname = sock_no_getname,
.poll = caif_poll,
.ioctl = sock_no_ioctl,
.listen = sock_no_listen,
.shutdown = caif_shutdown,
.setsockopt = setsockopt,
.getsockopt = sock_no_getsockopt,
.sendmsg = caif_sendmsg,
.recvmsg = caif_recvmsg,
.mmap = sock_no_mmap,
.sendpage = caif_sock_no_sendpage,
};
/* This function is called when a socket is finally destroyed. */
static void caif_sock_destructor(struct sock *sk)
{
struct caifsock *cf_sk = NULL;
cf_sk = container_of(sk, struct caifsock, sk);
/* Error checks. */
caif_assert(!atomic_read(&sk->sk_wmem_alloc));
caif_assert(sk_unhashed(sk));
caif_assert(!sk->sk_socket);
if (!sock_flag(sk, SOCK_DEAD)) {
pr_debug("CAIF: %s(): 0x%p", __func__, sk);
return;
}
if (STATE_IS_OPEN(cf_sk)) {
pr_debug("CAIF: %s(): socket is opened (cf_sk=%p)"
" file_mode = 0x%x\n", __func__,
cf_sk, cf_sk->file_mode);
return;
}
drain_queue(cf_sk);
kfree(cf_sk->pktq);
trace_printk("CAIF: %s(): caif_sock_destructor: Removing socket %s\n",
__func__, cf_sk->name);
atomic_dec(&caif_nr_socks);
}
static int caif_create(struct net *net, struct socket *sock, int protocol,
int kern)
{
struct sock *sk = NULL;
struct caifsock *cf_sk = NULL;
int result = 0;
static struct proto prot = {.name = "PF_CAIF",
.owner = THIS_MODULE,
.obj_size = sizeof(struct caifsock),
};
/*
* The sock->type specifies the socket type to use.
* in SEQPACKET mode packet boundaries are enforced.
*/
if (sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM)
return -ESOCKTNOSUPPORT;
if (net != &init_net)
return -EAFNOSUPPORT;
if (protocol < 0 || protocol >= CAIFPROTO_MAX)
return -EPROTONOSUPPORT;
/*
* Set the socket state to unconnected. The socket state is really
* not used at all in the net/core or socket.c but the
* initialization makes sure that sock->state is not uninitialized.
*/
sock->state = SS_UNCONNECTED;
sk = sk_alloc(net, PF_CAIF, GFP_KERNEL, &prot);
if (!sk)
return -ENOMEM;
cf_sk = container_of(sk, struct caifsock, sk);
/* Store the protocol */
sk->sk_protocol = (unsigned char) protocol;
spin_lock_init(&cf_sk->read_queue_len_lock);
/* Fill in some information concerning the misc socket. */
snprintf(cf_sk->name, sizeof(cf_sk->name), "cf_sk%d",
atomic_read(&caif_nr_socks));
/*
* Lock in order to try to stop someone from opening the socket
* too early.
*/
lock_sock(&(cf_sk->sk));
/* Initialize the nozero default sock structure data. */
sock_init_data(sock, sk);
sock->ops = &caif_ops;
sk->sk_destruct = caif_sock_destructor;
sk->sk_sndbuf = caif_sockbuf_size;
sk->sk_rcvbuf = caif_sockbuf_size;
cf_sk->pktq = cfpktq_create();
if (!cf_sk->pktq) {
pr_err("CAIF: %s(): queue create failed.\n", __func__);
result = -ENOMEM;
release_sock(&cf_sk->sk);
goto err_failed;
}
cf_sk->layer.ctrlcmd = caif_sktflowctrl_cb;
SET_STATE_CLOSED(cf_sk);
SET_PENDING_OFF(cf_sk);
SET_TX_FLOW_OFF(cf_sk);
SET_RX_FLOW_ON(cf_sk);
/* Set default options on configuration */
cf_sk->conn_req.priority = CAIF_PRIO_NORMAL;
cf_sk->conn_req.link_selector = CAIF_LINK_HIGH_BANDW;
cf_sk->conn_req.protocol = protocol;
/* Increase the number of sockets created. */
atomic_inc(&caif_nr_socks);
if (!IS_ERR(debugfsdir)) {
cf_sk->debugfs_socket_dir =
debugfs_create_dir(cf_sk->name, debugfsdir);
debugfs_create_u32("conn_state", S_IRUSR | S_IWUSR,
cf_sk->debugfs_socket_dir, &cf_sk->conn_state);
debugfs_create_u32("flow_state", S_IRUSR | S_IWUSR,
cf_sk->debugfs_socket_dir, &cf_sk->flow_state);
debugfs_create_u32("read_queue_len", S_IRUSR | S_IWUSR,
cf_sk->debugfs_socket_dir,
(u32 *) &cf_sk->read_queue_len);
debugfs_create_u32("identity", S_IRUSR | S_IWUSR,
cf_sk->debugfs_socket_dir,
(u32 *) &cf_sk->layer.id);
}
release_sock(&cf_sk->sk);
return 0;
err_failed:
sk_free(sk);
return result;
}
static struct net_proto_family caif_family_ops = {
.family = PF_CAIF,
.create = caif_create,
.owner = THIS_MODULE,
};
static int af_caif_init(void)
{
int err;
err = sock_register(&caif_family_ops);
if (!err)
return err;
return 0;
}
static int __init caif_sktinit_module(void)
{
int stat;
#ifdef CONFIG_DEBUG_FS
debugfsdir = debugfs_create_dir("chnl_skt", NULL);
if (!IS_ERR(debugfsdir)) {
debugfs_create_u32("skb_inuse", S_IRUSR | S_IWUSR,
debugfsdir,
(u32 *) &cnt.skb_in_use);
debugfs_create_u32("skb_alloc", S_IRUSR | S_IWUSR,
debugfsdir,
(u32 *) &cnt.skb_alloc);
debugfs_create_u32("skb_free", S_IRUSR | S_IWUSR,
debugfsdir,
(u32 *) &cnt.skb_free);
debugfs_create_u32("num_sockets", S_IRUSR | S_IWUSR,
debugfsdir,
(u32 *) &caif_nr_socks);
debugfs_create_u32("num_open", S_IRUSR | S_IWUSR,
debugfsdir,
(u32 *) &cnt.num_open);
debugfs_create_u32("num_close", S_IRUSR | S_IWUSR,
debugfsdir,
(u32 *) &cnt.num_close);
debugfs_create_u32("num_init", S_IRUSR | S_IWUSR,
debugfsdir,
(u32 *) &cnt.num_init);
debugfs_create_u32("num_init_resp", S_IRUSR | S_IWUSR,
debugfsdir,
(u32 *) &cnt.num_init_resp);
debugfs_create_u32("num_init_fail_resp", S_IRUSR | S_IWUSR,
debugfsdir,
(u32 *) &cnt.num_init_fail_resp);
debugfs_create_u32("num_deinit", S_IRUSR | S_IWUSR,
debugfsdir,
(u32 *) &cnt.num_deinit);
debugfs_create_u32("num_deinit_resp", S_IRUSR | S_IWUSR,
debugfsdir,
(u32 *) &cnt.num_deinit_resp);
debugfs_create_u32("num_remote_shutdown_ind",
S_IRUSR | S_IWUSR, debugfsdir,
(u32 *) &cnt.num_remote_shutdown_ind);
debugfs_create_u32("num_tx_flow_off_ind", S_IRUSR | S_IWUSR,
debugfsdir,
(u32 *) &cnt.num_tx_flow_off_ind);
debugfs_create_u32("num_tx_flow_on_ind", S_IRUSR | S_IWUSR,
debugfsdir,
(u32 *) &cnt.num_tx_flow_on_ind);
debugfs_create_u32("num_rx_flow_off", S_IRUSR | S_IWUSR,
debugfsdir,
(u32 *) &cnt.num_rx_flow_off);
debugfs_create_u32("num_rx_flow_on", S_IRUSR | S_IWUSR,
debugfsdir,
(u32 *) &cnt.num_rx_flow_on);
}
#endif
stat = af_caif_init();
if (stat) {
pr_err("CAIF: %s(): Failed to initialize CAIF socket layer.",
__func__);
return stat;
}
return 0;
}
static void __exit caif_sktexit_module(void)
{
sock_unregister(PF_CAIF);
if (debugfsdir != NULL)
debugfs_remove_recursive(debugfsdir);
}
module_init(caif_sktinit_module);
module_exit(caif_sktexit_module);
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