linux/net/caif/caif_socket.c
Sjur Braendeland bece7b2398 caif: Rewritten socket implementation
Changes:
 This is a complete re-write of the socket layer. Making the socket
 implementation more aligned with the other socket layers and using more
 of the support functions available in sock.c. Lots of code is copied
 from af_unix (and some from af_irda).
 Non-blocking mode should be working as well.

Signed-off-by: Sjur Braendeland <sjur.brandeland@stericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2010-04-28 12:55:14 -07:00

1253 lines
31 KiB
C

/*
* Copyright (C) ST-Ericsson AB 2010
* Author: Sjur Brendeland sjur.brandeland@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 <linux/mutex.h>
#include <linux/debugfs.h>
#include <linux/caif/caif_socket.h>
#include <asm/atomic.h>
#include <net/sock.h>
#include <net/tcp_states.h>
#include <net/caif/caif_layer.h>
#include <net/caif/caif_dev.h>
#include <net/caif/cfpkt.h>
MODULE_LICENSE("GPL");
MODULE_ALIAS_NETPROTO(AF_CAIF);
#define CAIF_DEF_SNDBUF (CAIF_MAX_PAYLOAD_SIZE*10)
#define CAIF_DEF_RCVBUF (CAIF_MAX_PAYLOAD_SIZE*100)
/*
* CAIF state is re-using the TCP socket states.
* caif_states stored in sk_state reflect the state as reported by
* the CAIF stack, while sk_socket->state is the state of the socket.
*/
enum caif_states {
CAIF_CONNECTED = TCP_ESTABLISHED,
CAIF_CONNECTING = TCP_SYN_SENT,
CAIF_DISCONNECTED = TCP_CLOSE
};
#define TX_FLOW_ON_BIT 1
#define RX_FLOW_ON_BIT 2
static struct dentry *debugfsdir;
#ifdef CONFIG_DEBUG_FS
struct debug_fs_counter {
atomic_t caif_nr_socks;
atomic_t num_connect_req;
atomic_t num_connect_resp;
atomic_t num_connect_fail_resp;
atomic_t num_disconnect;
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;
};
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
struct caifsock {
struct sock sk; /* must be first member */
struct cflayer layer;
char name[CAIF_LAYER_NAME_SZ]; /* Used for debugging */
u32 flow_state;
struct caif_connect_request conn_req;
struct mutex readlock;
struct dentry *debugfs_socket_dir;
};
static int rx_flow_is_on(struct caifsock *cf_sk)
{
return test_bit(RX_FLOW_ON_BIT,
(void *) &cf_sk->flow_state);
}
static int tx_flow_is_on(struct caifsock *cf_sk)
{
return test_bit(TX_FLOW_ON_BIT,
(void *) &cf_sk->flow_state);
}
static void set_rx_flow_off(struct caifsock *cf_sk)
{
clear_bit(RX_FLOW_ON_BIT,
(void *) &cf_sk->flow_state);
}
static void set_rx_flow_on(struct caifsock *cf_sk)
{
set_bit(RX_FLOW_ON_BIT,
(void *) &cf_sk->flow_state);
}
static void set_tx_flow_off(struct caifsock *cf_sk)
{
clear_bit(TX_FLOW_ON_BIT,
(void *) &cf_sk->flow_state);
}
static void set_tx_flow_on(struct caifsock *cf_sk)
{
set_bit(TX_FLOW_ON_BIT,
(void *) &cf_sk->flow_state);
}
static void caif_read_lock(struct sock *sk)
{
struct caifsock *cf_sk;
cf_sk = container_of(sk, struct caifsock, sk);
mutex_lock(&cf_sk->readlock);
}
static void caif_read_unlock(struct sock *sk)
{
struct caifsock *cf_sk;
cf_sk = container_of(sk, struct caifsock, sk);
mutex_unlock(&cf_sk->readlock);
}
int sk_rcvbuf_lowwater(struct caifsock *cf_sk)
{
/* A quarter of full buffer is used a low water mark */
return cf_sk->sk.sk_rcvbuf / 4;
}
void caif_flow_ctrl(struct sock *sk, int mode)
{
struct caifsock *cf_sk;
cf_sk = container_of(sk, struct caifsock, sk);
if (cf_sk->layer.dn)
cf_sk->layer.dn->modemcmd(cf_sk->layer.dn, mode);
}
/*
* Copied from sock.c:sock_queue_rcv_skb(), but changed so packets are
* not dropped, but CAIF is sending flow off instead.
*/
int caif_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
{
int err;
int skb_len;
unsigned long flags;
struct sk_buff_head *list = &sk->sk_receive_queue;
struct caifsock *cf_sk = container_of(sk, struct caifsock, sk);
if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >=
(unsigned)sk->sk_rcvbuf && rx_flow_is_on(cf_sk)) {
trace_printk("CAIF: %s():"
" sending flow OFF (queue len = %d %d)\n",
__func__,
atomic_read(&cf_sk->sk.sk_rmem_alloc),
sk_rcvbuf_lowwater(cf_sk));
set_rx_flow_off(cf_sk);
if (cf_sk->layer.dn)
cf_sk->layer.dn->modemcmd(cf_sk->layer.dn,
CAIF_MODEMCMD_FLOW_OFF_REQ);
}
err = sk_filter(sk, skb);
if (err)
return err;
if (!sk_rmem_schedule(sk, skb->truesize) && rx_flow_is_on(cf_sk)) {
set_rx_flow_off(cf_sk);
trace_printk("CAIF: %s():"
" sending flow OFF due to rmem_schedule\n",
__func__);
if (cf_sk->layer.dn)
cf_sk->layer.dn->modemcmd(cf_sk->layer.dn,
CAIF_MODEMCMD_FLOW_OFF_REQ);
}
skb->dev = NULL;
skb_set_owner_r(skb, sk);
/* Cache the SKB length before we tack it onto the receive
* queue. Once it is added it no longer belongs to us and
* may be freed by other threads of control pulling packets
* from the queue.
*/
skb_len = skb->len;
spin_lock_irqsave(&list->lock, flags);
if (!sock_flag(sk, SOCK_DEAD))
__skb_queue_tail(list, skb);
spin_unlock_irqrestore(&list->lock, flags);
if (!sock_flag(sk, SOCK_DEAD))
sk->sk_data_ready(sk, skb_len);
else
kfree_skb(skb);
return 0;
}
/* Packet Receive Callback function called from CAIF Stack */
static int caif_sktrecv_cb(struct cflayer *layr, struct cfpkt *pkt)
{
struct caifsock *cf_sk;
struct sk_buff *skb;
cf_sk = container_of(layr, struct caifsock, layer);
skb = cfpkt_tonative(pkt);
if (unlikely(cf_sk->sk.sk_state != CAIF_CONNECTED)) {
cfpkt_destroy(pkt);
return 0;
}
caif_queue_rcv_skb(&cf_sk->sk, skb);
return 0;
}
/* Packet Control Callback function called from CAIF */
static void caif_ctrl_cb(struct cflayer *layr,
enum caif_ctrlcmd flow,
int phyid)
{
struct caifsock *cf_sk = container_of(layr, struct caifsock, layer);
switch (flow) {
case CAIF_CTRLCMD_FLOW_ON_IND:
/* OK from modem to start sending again */
dbfs_atomic_inc(&cnt.num_tx_flow_on_ind);
set_tx_flow_on(cf_sk);
cf_sk->sk.sk_state_change(&cf_sk->sk);
break;
case CAIF_CTRLCMD_FLOW_OFF_IND:
/* Modem asks us to shut up */
dbfs_atomic_inc(&cnt.num_tx_flow_off_ind);
set_tx_flow_off(cf_sk);
cf_sk->sk.sk_state_change(&cf_sk->sk);
break;
case CAIF_CTRLCMD_INIT_RSP:
/* We're now connected */
dbfs_atomic_inc(&cnt.num_connect_resp);
cf_sk->sk.sk_state = CAIF_CONNECTED;
set_tx_flow_on(cf_sk);
cf_sk->sk.sk_state_change(&cf_sk->sk);
break;
case CAIF_CTRLCMD_DEINIT_RSP:
/* We're now disconnected */
cf_sk->sk.sk_state = CAIF_DISCONNECTED;
cf_sk->sk.sk_state_change(&cf_sk->sk);
cfcnfg_release_adap_layer(&cf_sk->layer);
break;
case CAIF_CTRLCMD_INIT_FAIL_RSP:
/* Connect request failed */
dbfs_atomic_inc(&cnt.num_connect_fail_resp);
cf_sk->sk.sk_err = ECONNREFUSED;
cf_sk->sk.sk_state = CAIF_DISCONNECTED;
cf_sk->sk.sk_shutdown = SHUTDOWN_MASK;
/*
* Socket "standards" seems to require POLLOUT to
* be set at connect failure.
*/
set_tx_flow_on(cf_sk);
cf_sk->sk.sk_state_change(&cf_sk->sk);
break;
case CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND:
/* Modem has closed this connection, or device is down. */
dbfs_atomic_inc(&cnt.num_remote_shutdown_ind);
cf_sk->sk.sk_shutdown = SHUTDOWN_MASK;
cf_sk->sk.sk_err = ECONNRESET;
set_rx_flow_on(cf_sk);
cf_sk->sk.sk_error_report(&cf_sk->sk);
break;
default:
pr_debug("CAIF: %s(): Unexpected flow command %d\n",
__func__, flow);
}
}
static void caif_check_flow_release(struct sock *sk)
{
struct caifsock *cf_sk = container_of(sk, struct caifsock, sk);
if (cf_sk->layer.dn == NULL || cf_sk->layer.dn->modemcmd == NULL)
return;
if (rx_flow_is_on(cf_sk))
return;
if (atomic_read(&sk->sk_rmem_alloc) <= sk_rcvbuf_lowwater(cf_sk)) {
dbfs_atomic_inc(&cnt.num_rx_flow_on);
set_rx_flow_on(cf_sk);
cf_sk->layer.dn->modemcmd(cf_sk->layer.dn,
CAIF_MODEMCMD_FLOW_ON_REQ);
}
}
/*
* Copied from sock.c:sock_queue_rcv_skb(), and added check that user buffer
* has sufficient size.
*/
static int caif_seqpkt_recvmsg(struct kiocb *iocb, struct socket *sock,
struct msghdr *m, size_t buf_len, int flags)
{
struct sock *sk = sock->sk;
struct sk_buff *skb;
int ret = 0;
int len;
if (unlikely(!buf_len))
return -EINVAL;
skb = skb_recv_datagram(sk, flags, 0 , &ret);
if (!skb)
goto read_error;
len = skb->len;
if (skb && skb->len > buf_len && !(flags & MSG_PEEK)) {
len = buf_len;
/*
* Push skb back on receive queue if buffer too small.
* This has a built-in race where multi-threaded receive
* may get packet in wrong order, but multiple read does
* not really guarantee ordered delivery anyway.
* Let's optimize for speed without taking locks.
*/
skb_queue_head(&sk->sk_receive_queue, skb);
ret = -EMSGSIZE;
goto read_error;
}
ret = skb_copy_datagram_iovec(skb, 0, m->msg_iov, len);
if (ret)
goto read_error;
skb_free_datagram(sk, skb);
caif_check_flow_release(sk);
return len;
read_error:
return ret;
}
/* Copied from unix_stream_wait_data, identical except for lock call. */
static long caif_stream_data_wait(struct sock *sk, long timeo)
{
DEFINE_WAIT(wait);
lock_sock(sk);
for (;;) {
prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
if (!skb_queue_empty(&sk->sk_receive_queue) ||
sk->sk_err ||
sk->sk_state != CAIF_CONNECTED ||
sock_flag(sk, SOCK_DEAD) ||
(sk->sk_shutdown & RCV_SHUTDOWN) ||
signal_pending(current) ||
!timeo)
break;
set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
release_sock(sk);
timeo = schedule_timeout(timeo);
lock_sock(sk);
clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
}
finish_wait(sk_sleep(sk), &wait);
release_sock(sk);
return timeo;
}
/*
* Copied from unix_stream_recvmsg, but removed credit checks,
* changed locking calls, changed address handling.
*/
static int caif_stream_recvmsg(struct kiocb *iocb, struct socket *sock,
struct msghdr *msg, size_t size,
int flags)
{
struct sock *sk = sock->sk;
int copied = 0;
int target;
int err = 0;
long timeo;
err = -EOPNOTSUPP;
if (flags&MSG_OOB)
goto out;
msg->msg_namelen = 0;
/*
* Lock the socket to prevent queue disordering
* while sleeps in memcpy_tomsg
*/
err = -EAGAIN;
if (sk->sk_state == CAIF_CONNECTING)
goto out;
caif_read_lock(sk);
target = sock_rcvlowat(sk, flags&MSG_WAITALL, size);
timeo = sock_rcvtimeo(sk, flags&MSG_DONTWAIT);
do {
int chunk;
struct sk_buff *skb;
lock_sock(sk);
skb = skb_dequeue(&sk->sk_receive_queue);
caif_check_flow_release(sk);
if (skb == NULL) {
if (copied >= target)
goto unlock;
/*
* POSIX 1003.1g mandates this order.
*/
err = sock_error(sk);
if (err)
goto unlock;
err = -ECONNRESET;
if (sk->sk_shutdown & RCV_SHUTDOWN)
goto unlock;
err = -EPIPE;
if (sk->sk_state != CAIF_CONNECTED)
goto unlock;
if (sock_flag(sk, SOCK_DEAD))
goto unlock;
release_sock(sk);
err = -EAGAIN;
if (!timeo)
break;
caif_read_unlock(sk);
timeo = caif_stream_data_wait(sk, timeo);
if (signal_pending(current)) {
err = sock_intr_errno(timeo);
goto out;
}
caif_read_lock(sk);
continue;
unlock:
release_sock(sk);
break;
}
release_sock(sk);
chunk = min_t(unsigned int, skb->len, size);
if (memcpy_toiovec(msg->msg_iov, skb->data, chunk)) {
skb_queue_head(&sk->sk_receive_queue, skb);
if (copied == 0)
copied = -EFAULT;
break;
}
copied += chunk;
size -= chunk;
/* Mark read part of skb as used */
if (!(flags & MSG_PEEK)) {
skb_pull(skb, chunk);
/* put the skb back if we didn't use it up. */
if (skb->len) {
skb_queue_head(&sk->sk_receive_queue, skb);
break;
}
kfree_skb(skb);
} else {
/*
* It is questionable, see note in unix_dgram_recvmsg.
*/
/* put message back and return */
skb_queue_head(&sk->sk_receive_queue, skb);
break;
}
} while (size);
caif_read_unlock(sk);
out:
return copied ? : err;
}
/*
* Copied from sock.c:sock_wait_for_wmem, but change to wait for
* CAIF flow-on and sock_writable.
*/
static long caif_wait_for_flow_on(struct caifsock *cf_sk,
int wait_writeable, long timeo, int *err)
{
struct sock *sk = &cf_sk->sk;
DEFINE_WAIT(wait);
for (;;) {
*err = 0;
if (tx_flow_is_on(cf_sk) &&
(!wait_writeable || sock_writeable(&cf_sk->sk)))
break;
*err = -ETIMEDOUT;
if (!timeo)
break;
*err = -ERESTARTSYS;
if (signal_pending(current))
break;
prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
*err = -ECONNRESET;
if (sk->sk_shutdown & SHUTDOWN_MASK)
break;
*err = -sk->sk_err;
if (sk->sk_err)
break;
*err = -EPIPE;
if (cf_sk->sk.sk_state != CAIF_CONNECTED)
break;
timeo = schedule_timeout(timeo);
}
finish_wait(sk_sleep(sk), &wait);
return timeo;
}
/*
* Transmit a SKB. The device may temporarily request re-transmission
* by returning EAGAIN.
*/
static int transmit_skb(struct sk_buff *skb, struct caifsock *cf_sk,
int noblock, long timeo)
{
struct cfpkt *pkt;
int ret, loopcnt = 0;
pkt = cfpkt_fromnative(CAIF_DIR_OUT, skb);
memset(cfpkt_info(pkt), 0, sizeof(struct caif_payload_info));
do {
ret = -ETIMEDOUT;
/* Slight paranoia, probably not needed. */
if (unlikely(loopcnt++ > 1000)) {
pr_warning("CAIF: %s(): transmit retries failed,"
" error = %d\n", __func__, ret);
break;
}
if (cf_sk->layer.dn != NULL)
ret = cf_sk->layer.dn->transmit(cf_sk->layer.dn, pkt);
if (likely(ret >= 0))
break;
/* if transmit return -EAGAIN, then retry */
if (noblock && ret == -EAGAIN)
break;
timeo = caif_wait_for_flow_on(cf_sk, 0, timeo, &ret);
if (signal_pending(current)) {
ret = sock_intr_errno(timeo);
break;
}
if (ret)
break;
if (cf_sk->sk.sk_state != CAIF_CONNECTED ||
sock_flag(&cf_sk->sk, SOCK_DEAD) ||
(cf_sk->sk.sk_shutdown & RCV_SHUTDOWN)) {
ret = -EPIPE;
cf_sk->sk.sk_err = EPIPE;
break;
}
} while (ret == -EAGAIN);
return ret;
}
/* Copied from af_unix:unix_dgram_sendmsg, and adapted to CAIF */
static int caif_seqpkt_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);
int buffer_size;
int ret = 0;
struct sk_buff *skb = NULL;
int noblock;
long timeo;
caif_assert(cf_sk);
ret = sock_error(sk);
if (ret)
goto err;
ret = -EOPNOTSUPP;
if (msg->msg_flags&MSG_OOB)
goto err;
ret = -EOPNOTSUPP;
if (msg->msg_namelen)
goto err;
ret = -EINVAL;
if (unlikely(msg->msg_iov->iov_base == NULL))
goto err;
noblock = msg->msg_flags & MSG_DONTWAIT;
buffer_size = len + CAIF_NEEDED_HEADROOM + CAIF_NEEDED_TAILROOM;
ret = -EMSGSIZE;
if (buffer_size > CAIF_MAX_PAYLOAD_SIZE)
goto err;
timeo = sock_sndtimeo(sk, noblock);
timeo = caif_wait_for_flow_on(container_of(sk, struct caifsock, sk),
1, timeo, &ret);
ret = -EPIPE;
if (cf_sk->sk.sk_state != CAIF_CONNECTED ||
sock_flag(sk, SOCK_DEAD) ||
(sk->sk_shutdown & RCV_SHUTDOWN))
goto err;
ret = -ENOMEM;
skb = sock_alloc_send_skb(sk, buffer_size, noblock, &ret);
if (!skb)
goto err;
skb_reserve(skb, CAIF_NEEDED_HEADROOM);
ret = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
if (ret)
goto err;
ret = transmit_skb(skb, cf_sk, noblock, timeo);
if (ret < 0)
goto err;
return len;
err:
kfree_skb(skb);
return ret;
}
/*
* Copied from unix_stream_sendmsg and adapted to CAIF:
* Changed removed permission handling and added waiting for flow on
* and other minor adaptations.
*/
static int caif_stream_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);
int err, size;
struct sk_buff *skb;
int sent = 0;
long timeo;
err = -EOPNOTSUPP;
if (unlikely(msg->msg_flags&MSG_OOB))
goto out_err;
if (unlikely(msg->msg_namelen))
goto out_err;
timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
timeo = caif_wait_for_flow_on(cf_sk, 1, timeo, &err);
if (unlikely(sk->sk_shutdown & SEND_SHUTDOWN))
goto pipe_err;
while (sent < len) {
size = len-sent;
if (size > CAIF_MAX_PAYLOAD_SIZE)
size = CAIF_MAX_PAYLOAD_SIZE;
/* If size is more than half of sndbuf, chop up message */
if (size > ((sk->sk_sndbuf >> 1) - 64))
size = (sk->sk_sndbuf >> 1) - 64;
if (size > SKB_MAX_ALLOC)
size = SKB_MAX_ALLOC;
skb = sock_alloc_send_skb(sk,
size + CAIF_NEEDED_HEADROOM
+ CAIF_NEEDED_TAILROOM,
msg->msg_flags&MSG_DONTWAIT,
&err);
if (skb == NULL)
goto out_err;
skb_reserve(skb, CAIF_NEEDED_HEADROOM);
/*
* If you pass two values to the sock_alloc_send_skb
* it tries to grab the large buffer with GFP_NOFS
* (which can fail easily), and if it fails grab the
* fallback size buffer which is under a page and will
* succeed. [Alan]
*/
size = min_t(int, size, skb_tailroom(skb));
err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size);
if (err) {
kfree_skb(skb);
goto out_err;
}
err = transmit_skb(skb, cf_sk,
msg->msg_flags&MSG_DONTWAIT, timeo);
if (err < 0) {
kfree_skb(skb);
goto pipe_err;
}
sent += size;
}
return sent;
pipe_err:
if (sent == 0 && !(msg->msg_flags&MSG_NOSIGNAL))
send_sig(SIGPIPE, current, 0);
err = -EPIPE;
out_err:
return sent ? : err;
}
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 (cf_sk->sk.sk_socket->state != SS_UNCONNECTED)
return -ENOPROTOOPT;
switch (opt) {
case CAIFSO_LINK_SELECT:
if (ol < sizeof(int))
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))
return -EINVAL;
if (copy_from_user(&prio, ov, sizeof(int)))
return -EINVAL;
lock_sock(&(cf_sk->sk));
cf_sk->conn_req.priority = prio;
release_sock(&cf_sk->sk);
return 0;
case SO_BINDTODEVICE:
if (lvl != SOL_SOCKET)
goto bad_sol;
if (ol < sizeof(struct ifreq))
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;
lock_sock(&(cf_sk->sk));
cf_sk->conn_req.param.size = ol;
if (ol > sizeof(cf_sk->conn_req.param.data) ||
copy_from_user(&cf_sk->conn_req.param.data, ov, ol)) {
release_sock(&cf_sk->sk);
return -EINVAL;
}
release_sock(&cf_sk->sk);
return 0;
default:
return -ENOPROTOOPT;
}
return 0;
bad_sol:
return -ENOPROTOOPT;
}
/*
* caif_connect() - Connect a CAIF Socket
* Copied and modified af_irda.c:irda_connect().
*
* Note : by consulting "errno", the user space caller may learn the cause
* of the failure. Most of them are visible in the function, others may come
* from subroutines called and are listed here :
* o -EAFNOSUPPORT: bad socket family or type.
* o -ESOCKTNOSUPPORT: bad socket type or protocol
* o -EINVAL: bad socket address, or CAIF link type
* o -ECONNREFUSED: remote end refused the connection.
* o -EINPROGRESS: connect request sent but timed out (or non-blocking)
* o -EISCONN: already connected.
* o -ETIMEDOUT: Connection timed out (send timeout)
* o -ENODEV: No link layer to send request
* o -ECONNRESET: Received Shutdown indication or lost link layer
* o -ENOMEM: Out of memory
*
* State Strategy:
* o sk_state: holds the CAIF_* protocol state, it's updated by
* caif_ctrl_cb.
* o sock->state: holds the SS_* socket state and is updated by connect and
* disconnect.
*/
static int caif_connect(struct socket *sock, struct sockaddr *uaddr,
int addr_len, int flags)
{
struct sock *sk = sock->sk;
struct caifsock *cf_sk = container_of(sk, struct caifsock, sk);
long timeo;
int err;
lock_sock(sk);
err = -EAFNOSUPPORT;
if (uaddr->sa_family != AF_CAIF)
goto out;
err = -ESOCKTNOSUPPORT;
if (unlikely(!(sk->sk_type == SOCK_STREAM &&
cf_sk->sk.sk_protocol == CAIFPROTO_AT) &&
sk->sk_type != SOCK_SEQPACKET))
goto out;
switch (sock->state) {
case SS_UNCONNECTED:
/* Normal case, a fresh connect */
caif_assert(sk->sk_state == CAIF_DISCONNECTED);
break;
case SS_CONNECTING:
switch (sk->sk_state) {
case CAIF_CONNECTED:
sock->state = SS_CONNECTED;
err = -EISCONN;
goto out;
case CAIF_DISCONNECTED:
/* Reconnect allowed */
break;
case CAIF_CONNECTING:
err = -EALREADY;
if (flags & O_NONBLOCK)
goto out;
goto wait_connect;
}
break;
case SS_CONNECTED:
caif_assert(sk->sk_state == CAIF_CONNECTED ||
sk->sk_state == CAIF_DISCONNECTED);
if (sk->sk_shutdown & SHUTDOWN_MASK) {
/* Allow re-connect after SHUTDOWN_IND */
caif_disconnect_client(&cf_sk->layer);
break;
}
/* No reconnect on a seqpacket socket */
err = -EISCONN;
goto out;
case SS_DISCONNECTING:
case SS_FREE:
caif_assert(1); /*Should never happen */
break;
}
sk->sk_state = CAIF_DISCONNECTED;
sock->state = SS_UNCONNECTED;
sk_stream_kill_queues(&cf_sk->sk);
err = -EINVAL;
if (addr_len != sizeof(struct sockaddr_caif) ||
!uaddr)
goto out;
memcpy(&cf_sk->conn_req.sockaddr, uaddr,
sizeof(struct sockaddr_caif));
/* Move to connecting socket, start sending Connect Requests */
sock->state = SS_CONNECTING;
sk->sk_state = CAIF_CONNECTING;
dbfs_atomic_inc(&cnt.num_connect_req);
cf_sk->layer.receive = caif_sktrecv_cb;
err = caif_connect_client(&cf_sk->conn_req,
&cf_sk->layer);
if (err < 0) {
cf_sk->sk.sk_socket->state = SS_UNCONNECTED;
cf_sk->sk.sk_state = CAIF_DISCONNECTED;
goto out;
}
err = -EINPROGRESS;
wait_connect:
if (sk->sk_state != CAIF_CONNECTED && (flags & O_NONBLOCK))
goto out;
timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
release_sock(sk);
err = wait_event_interruptible_timeout(*sk_sleep(sk),
sk->sk_state != CAIF_CONNECTING,
timeo);
lock_sock(sk);
if (err < 0)
goto out; /* -ERESTARTSYS */
if (err == 0 && sk->sk_state != CAIF_CONNECTED) {
err = -ETIMEDOUT;
goto out;
}
if (sk->sk_state != CAIF_CONNECTED) {
sock->state = SS_UNCONNECTED;
err = sock_error(sk);
if (!err)
err = -ECONNREFUSED;
goto out;
}
sock->state = SS_CONNECTED;
err = 0;
out:
release_sock(sk);
return err;
}
/*
* caif_release() - Disconnect a CAIF Socket
* Copied and modified af_irda.c:irda_release().
*/
static int caif_release(struct socket *sock)
{
struct sock *sk = sock->sk;
struct caifsock *cf_sk = container_of(sk, struct caifsock, sk);
int res = 0;
if (!sk)
return 0;
set_tx_flow_off(cf_sk);
/*
* Ensure that packets are not queued after this point in time.
* caif_queue_rcv_skb checks SOCK_DEAD holding the queue lock,
* this ensures no packets when sock is dead.
*/
spin_lock(&sk->sk_receive_queue.lock);
sock_set_flag(sk, SOCK_DEAD);
spin_unlock(&sk->sk_receive_queue.lock);
sock->sk = NULL;
dbfs_atomic_inc(&cnt.num_disconnect);
if (cf_sk->debugfs_socket_dir != NULL)
debugfs_remove_recursive(cf_sk->debugfs_socket_dir);
lock_sock(&(cf_sk->sk));
sk->sk_state = CAIF_DISCONNECTED;
sk->sk_shutdown = SHUTDOWN_MASK;
if (cf_sk->sk.sk_socket->state == SS_CONNECTED ||
cf_sk->sk.sk_socket->state == SS_CONNECTING)
res = caif_disconnect_client(&cf_sk->layer);
cf_sk->sk.sk_socket->state = SS_DISCONNECTING;
wake_up_interruptible_poll(sk_sleep(sk), POLLERR|POLLHUP);
sock_orphan(sk);
cf_sk->layer.dn = NULL;
sk_stream_kill_queues(&cf_sk->sk);
release_sock(sk);
sock_put(sk);
return res;
}
/* Copied from af_unix.c:unix_poll(), added CAIF tx_flow handling */
static unsigned int caif_poll(struct file *file,
struct socket *sock, poll_table *wait)
{
struct sock *sk = sock->sk;
unsigned int mask;
struct caifsock *cf_sk = container_of(sk, struct caifsock, sk);
sock_poll_wait(file, sk_sleep(sk), wait);
mask = 0;
/* exceptional events? */
if (sk->sk_err)
mask |= POLLERR;
if (sk->sk_shutdown == SHUTDOWN_MASK)
mask |= POLLHUP;
if (sk->sk_shutdown & RCV_SHUTDOWN)
mask |= POLLRDHUP;
/* readable? */
if (!skb_queue_empty(&sk->sk_receive_queue) ||
(sk->sk_shutdown & RCV_SHUTDOWN))
mask |= POLLIN | POLLRDNORM;
/* Connection-based need to check for termination and startup */
if (sk->sk_state == CAIF_DISCONNECTED)
mask |= POLLHUP;
/*
* we set writable also when the other side has shut down the
* connection. This prevents stuck sockets.
*/
if (sock_writeable(sk) && tx_flow_is_on(cf_sk))
mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
return mask;
}
static const struct proto_ops caif_seqpacket_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 = sock_no_shutdown,
.setsockopt = setsockopt,
.getsockopt = sock_no_getsockopt,
.sendmsg = caif_seqpkt_sendmsg,
.recvmsg = caif_seqpkt_recvmsg,
.mmap = sock_no_mmap,
.sendpage = sock_no_sendpage,
};
static const struct proto_ops caif_stream_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 = sock_no_shutdown,
.setsockopt = setsockopt,
.getsockopt = sock_no_getsockopt,
.sendmsg = caif_stream_sendmsg,
.recvmsg = caif_stream_recvmsg,
.mmap = sock_no_mmap,
.sendpage = 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 = container_of(sk, struct caifsock, sk);
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_info("Attempt to release alive CAIF socket: %p\n", sk);
return;
}
sk_stream_kill_queues(&cf_sk->sk);
dbfs_atomic_dec(&cnt.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;
static struct proto prot = {.name = "PF_CAIF",
.owner = THIS_MODULE,
.obj_size = sizeof(struct caifsock),
};
if (!capable(CAP_SYS_ADMIN) && !capable(CAP_NET_ADMIN))
return -EPERM;
/*
* The sock->type specifies the socket type to use.
* The CAIF socket is a packet stream in the sense
* that it is packet based. CAIF trusts the reliability
* of the link, no resending is implemented.
*/
if (sock->type == SOCK_SEQPACKET)
sock->ops = &caif_seqpacket_ops;
else if (sock->type == SOCK_STREAM)
sock->ops = &caif_stream_ops;
else
return -ESOCKTNOSUPPORT;
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.
*/
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;
/* Sendbuf dictates the amount of outbound packets not yet sent */
sk->sk_sndbuf = CAIF_DEF_SNDBUF;
sk->sk_rcvbuf = CAIF_DEF_RCVBUF;
/*
* 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);
sk->sk_destruct = caif_sock_destructor;
mutex_init(&cf_sk->readlock); /* single task reading lock */
cf_sk->layer.ctrlcmd = caif_ctrl_cb;
cf_sk->sk.sk_socket->state = SS_UNCONNECTED;
cf_sk->sk.sk_state = CAIF_DISCONNECTED;
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_LOW_LATENCY;
cf_sk->conn_req.protocol = protocol;
/* Increase the number of sockets created. */
dbfs_atomic_inc(&cnt.caif_nr_socks);
#ifdef CONFIG_DEBUG_FS
if (!IS_ERR(debugfsdir)) {
/* Fill in some information concerning the misc socket. */
snprintf(cf_sk->name, sizeof(cf_sk->name), "cfsk%d",
atomic_read(&cnt.caif_nr_socks));
cf_sk->debugfs_socket_dir =
debugfs_create_dir(cf_sk->name, debugfsdir);
debugfs_create_u32("sk_state", S_IRUSR | S_IWUSR,
cf_sk->debugfs_socket_dir,
(u32 *) &cf_sk->sk.sk_state);
debugfs_create_u32("flow_state", S_IRUSR | S_IWUSR,
cf_sk->debugfs_socket_dir, &cf_sk->flow_state);
debugfs_create_u32("sk_rmem_alloc", S_IRUSR | S_IWUSR,
cf_sk->debugfs_socket_dir,
(u32 *) &cf_sk->sk.sk_rmem_alloc);
debugfs_create_u32("sk_wmem_alloc", S_IRUSR | S_IWUSR,
cf_sk->debugfs_socket_dir,
(u32 *) &cf_sk->sk.sk_wmem_alloc);
debugfs_create_u32("identity", S_IRUSR | S_IWUSR,
cf_sk->debugfs_socket_dir,
(u32 *) &cf_sk->layer.id);
}
#endif
release_sock(&cf_sk->sk);
return 0;
}
static struct net_proto_family caif_family_ops = {
.family = PF_CAIF,
.create = caif_create,
.owner = THIS_MODULE,
};
int af_caif_init(void)
{
int err = sock_register(&caif_family_ops);
if (!err)
return err;
return 0;
}
static int __init caif_sktinit_module(void)
{
#ifdef CONFIG_DEBUG_FS
debugfsdir = debugfs_create_dir("caif_sk", NULL);
if (!IS_ERR(debugfsdir)) {
debugfs_create_u32("num_sockets", S_IRUSR | S_IWUSR,
debugfsdir,
(u32 *) &cnt.caif_nr_socks);
debugfs_create_u32("num_connect_req", S_IRUSR | S_IWUSR,
debugfsdir,
(u32 *) &cnt.num_connect_req);
debugfs_create_u32("num_connect_resp", S_IRUSR | S_IWUSR,
debugfsdir,
(u32 *) &cnt.num_connect_resp);
debugfs_create_u32("num_connect_fail_resp", S_IRUSR | S_IWUSR,
debugfsdir,
(u32 *) &cnt.num_connect_fail_resp);
debugfs_create_u32("num_disconnect", S_IRUSR | S_IWUSR,
debugfsdir,
(u32 *) &cnt.num_disconnect);
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
return af_caif_init();
}
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);