| /* |
| * Copyright (C) ST-Ericsson AB 2010 |
| * Author: Sjur Brendeland sjur.brandeland@stericsson.com |
| * License terms: GNU General Public License (GPL) version 2 |
| */ |
| |
| #define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__ |
| |
| #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/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); |
| |
| /* |
| * 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; |
| }; |
| 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 |
| |
| 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; |
| int headroom, tailroom, maxframe; |
| }; |
| |
| 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); |
| } |
| |
| static 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; |
| } |
| |
| static 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->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. |
| */ |
| static 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)) { |
| pr_debug("sending flow OFF (queue len = %d %d)\n", |
| atomic_read(&cf_sk->sk.sk_rmem_alloc), |
| sk_rcvbuf_lowwater(cf_sk)); |
| set_rx_flow_off(cf_sk); |
| dbfs_atomic_inc(&cnt.num_rx_flow_off); |
| caif_flow_ctrl(sk, 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); |
| pr_debug("sending flow OFF due to rmem_schedule\n"); |
| dbfs_atomic_inc(&cnt.num_rx_flow_off); |
| caif_flow_ctrl(sk, 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; |
| } |
| |
| static void cfsk_hold(struct cflayer *layr) |
| { |
| struct caifsock *cf_sk = container_of(layr, struct caifsock, layer); |
| sock_hold(&cf_sk->sk); |
| } |
| |
| static void cfsk_put(struct cflayer *layr) |
| { |
| struct caifsock *cf_sk = container_of(layr, struct caifsock, layer); |
| sock_put(&cf_sk->sk); |
| } |
| |
| /* 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 */ |
| caif_client_register_refcnt(&cf_sk->layer, |
| cfsk_hold, cfsk_put); |
| 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); |
| 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("Unexpected flow command %d\n", flow); |
| } |
| } |
| |
| static void caif_check_flow_release(struct sock *sk) |
| { |
| struct caifsock *cf_sk = container_of(sk, struct caifsock, sk); |
| |
| 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); |
| caif_flow_ctrl(sk, CAIF_MODEMCMD_FLOW_ON_REQ); |
| } |
| } |
| |
| /* |
| * Copied from unix_dgram_recvmsg, but removed credit checks, |
| * changed locking, address handling and added MSG_TRUNC. |
| */ |
| static int caif_seqpkt_recvmsg(struct kiocb *iocb, struct socket *sock, |
| struct msghdr *m, size_t len, int flags) |
| |
| { |
| struct sock *sk = sock->sk; |
| struct sk_buff *skb; |
| int ret; |
| int copylen; |
| |
| ret = -EOPNOTSUPP; |
| if (m->msg_flags&MSG_OOB) |
| goto read_error; |
| |
| skb = skb_recv_datagram(sk, flags, 0 , &ret); |
| if (!skb) |
| goto read_error; |
| copylen = skb->len; |
| if (len < copylen) { |
| m->msg_flags |= MSG_TRUNC; |
| copylen = len; |
| } |
| |
| ret = skb_copy_datagram_iovec(skb, 0, m->msg_iov, copylen); |
| if (ret) |
| goto out_free; |
| |
| ret = (flags & MSG_TRUNC) ? skb->len : copylen; |
| out_free: |
| skb_free_datagram(sk, skb); |
| caif_check_flow_release(sk); |
| return ret; |
| |
| 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; |
| |
| pkt = cfpkt_fromnative(CAIF_DIR_OUT, skb); |
| memset(cfpkt_info(pkt), 0, sizeof(struct caif_payload_info)); |
| |
| if (cf_sk->layer.dn == NULL) |
| return -EINVAL; |
| |
| return cf_sk->layer.dn->transmit(cf_sk->layer.dn, pkt); |
| } |
| |
| /* 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; |
| |
| timeo = sock_sndtimeo(sk, noblock); |
| timeo = caif_wait_for_flow_on(container_of(sk, struct caifsock, sk), |
| 1, timeo, &ret); |
| |
| if (ret) |
| goto err; |
| ret = -EPIPE; |
| if (cf_sk->sk.sk_state != CAIF_CONNECTED || |
| sock_flag(sk, SOCK_DEAD) || |
| (sk->sk_shutdown & RCV_SHUTDOWN)) |
| goto err; |
| |
| /* Error if trying to write more than maximum frame size. */ |
| ret = -EMSGSIZE; |
| if (len > cf_sk->maxframe && cf_sk->sk.sk_protocol != CAIFPROTO_RFM) |
| goto err; |
| |
| buffer_size = len + cf_sk->headroom + cf_sk->tailroom; |
| |
| ret = -ENOMEM; |
| skb = sock_alloc_send_skb(sk, buffer_size, noblock, &ret); |
| |
| if (!skb || skb_tailroom(skb) < buffer_size) |
| goto err; |
| |
| skb_reserve(skb, cf_sk->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 > cf_sk->maxframe) |
| size = cf_sk->maxframe; |
| |
| /* 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 + cf_sk->headroom + |
| cf_sk->tailroom, |
| msg->msg_flags&MSG_DONTWAIT, |
| &err); |
| if (skb == NULL) |
| goto out_err; |
| |
| skb_reserve(skb, cf_sk->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 linksel; |
| |
| 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 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)); |
| 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; |
| } |
| cf_sk->conn_req.param.size = ol; |
| 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; |
| int ifindex, headroom, tailroom; |
| unsigned int mtu; |
| struct net_device *dev; |
| |
| lock_sock(sk); |
| |
| err = -EAFNOSUPPORT; |
| if (uaddr->sa_family != AF_CAIF) |
| 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)) |
| 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; |
| |
| /* Check priority value coming from socket */ |
| /* if priority value is out of range it will be ajusted */ |
| if (cf_sk->sk.sk_priority > CAIF_PRIO_MAX) |
| cf_sk->conn_req.priority = CAIF_PRIO_MAX; |
| else if (cf_sk->sk.sk_priority < CAIF_PRIO_MIN) |
| cf_sk->conn_req.priority = CAIF_PRIO_MIN; |
| else |
| cf_sk->conn_req.priority = cf_sk->sk.sk_priority; |
| |
| /*ifindex = id of the interface.*/ |
| cf_sk->conn_req.ifindex = cf_sk->sk.sk_bound_dev_if; |
| |
| 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, &ifindex, &headroom, &tailroom); |
| |
| if (err < 0) { |
| cf_sk->sk.sk_socket->state = SS_UNCONNECTED; |
| cf_sk->sk.sk_state = CAIF_DISCONNECTED; |
| goto out; |
| } |
| |
| err = -ENODEV; |
| rcu_read_lock(); |
| dev = dev_get_by_index_rcu(sock_net(sk), ifindex); |
| if (!dev) { |
| rcu_read_unlock(); |
| goto out; |
| } |
| cf_sk->headroom = LL_RESERVED_SPACE_EXTRA(dev, headroom); |
| mtu = dev->mtu; |
| rcu_read_unlock(); |
| |
| cf_sk->tailroom = tailroom; |
| cf_sk->maxframe = mtu - (headroom + tailroom); |
| if (cf_sk->maxframe < 1) { |
| pr_warn("CAIF Interface MTU too small (%d)\n", dev->mtu); |
| err = -ENODEV; |
| 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 = -ERESTARTSYS; |
| timeo = wait_event_interruptible_timeout(*sk_sleep(sk), |
| sk->sk_state != CAIF_CONNECTING, |
| timeo); |
| lock_sock(sk); |
| if (timeo < 0) |
| goto out; /* -ERESTARTSYS */ |
| |
| err = -ETIMEDOUT; |
| if (timeo == 0 && sk->sk_state != CAIF_CONNECTED) |
| 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); |
| 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; |
| |
| /* |
| * 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); |
| caif_free_client(&cf_sk->layer); |
| } |
| |
| 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; |
| |
| /* |
| * 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->sk.sk_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, |
| }; |
| |
| static 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); |