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![sjur.brandeland@stericsson.com](/assets/img/avatar_default.png)
CAIF Socket layer - caif_socket.c: - Plug mem-leak at reconnect. - Always call disconnect to cleanup CAIF stack. - Disconnect will always report success. CAIF configuration layer - cfcnfg.c - Disconnect must dismantle the caif stack correctly - Protect against faulty removals (check on id zero) CAIF mux layer - cfmuxl.c - When inserting new service layer in the MUX remove any old entries with the same ID. - When removing CAIF Link layer, remove the associated service layers before notifying service layers. Signed-off-by: Sjur Brændeland <sjur.brandeland@stericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
1220 lines
30 KiB
C
1220 lines
30 KiB
C
/*
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* Copyright (C) ST-Ericsson AB 2010
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* Author: Sjur Brendeland sjur.brandeland@stericsson.com
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* License terms: GNU General Public License (GPL) version 2
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__
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#include <linux/fs.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/sched.h>
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#include <linux/spinlock.h>
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#include <linux/mutex.h>
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#include <linux/list.h>
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#include <linux/wait.h>
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#include <linux/poll.h>
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#include <linux/tcp.h>
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#include <linux/uaccess.h>
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#include <linux/debugfs.h>
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#include <linux/caif/caif_socket.h>
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#include <linux/atomic.h>
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#include <net/sock.h>
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#include <net/tcp_states.h>
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#include <net/caif/caif_layer.h>
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#include <net/caif/caif_dev.h>
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#include <net/caif/cfpkt.h>
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MODULE_LICENSE("GPL");
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MODULE_ALIAS_NETPROTO(AF_CAIF);
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/*
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* CAIF state is re-using the TCP socket states.
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* caif_states stored in sk_state reflect the state as reported by
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* the CAIF stack, while sk_socket->state is the state of the socket.
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*/
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enum caif_states {
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CAIF_CONNECTED = TCP_ESTABLISHED,
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CAIF_CONNECTING = TCP_SYN_SENT,
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CAIF_DISCONNECTED = TCP_CLOSE
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};
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#define TX_FLOW_ON_BIT 1
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#define RX_FLOW_ON_BIT 2
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static struct dentry *debugfsdir;
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#ifdef CONFIG_DEBUG_FS
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struct debug_fs_counter {
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atomic_t caif_nr_socks;
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atomic_t caif_sock_create;
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atomic_t num_connect_req;
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atomic_t num_connect_resp;
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atomic_t num_connect_fail_resp;
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atomic_t num_disconnect;
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atomic_t num_remote_shutdown_ind;
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atomic_t num_tx_flow_off_ind;
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atomic_t num_tx_flow_on_ind;
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atomic_t num_rx_flow_off;
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atomic_t num_rx_flow_on;
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};
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static struct debug_fs_counter cnt;
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#define dbfs_atomic_inc(v) atomic_inc_return(v)
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#define dbfs_atomic_dec(v) atomic_dec_return(v)
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#else
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#define dbfs_atomic_inc(v) 0
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#define dbfs_atomic_dec(v) 0
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#endif
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struct caifsock {
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struct sock sk; /* must be first member */
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struct cflayer layer;
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char name[CAIF_LAYER_NAME_SZ]; /* Used for debugging */
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u32 flow_state;
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struct caif_connect_request conn_req;
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struct mutex readlock;
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struct dentry *debugfs_socket_dir;
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int headroom, tailroom, maxframe;
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};
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static int rx_flow_is_on(struct caifsock *cf_sk)
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{
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return test_bit(RX_FLOW_ON_BIT,
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(void *) &cf_sk->flow_state);
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}
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static int tx_flow_is_on(struct caifsock *cf_sk)
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{
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return test_bit(TX_FLOW_ON_BIT,
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(void *) &cf_sk->flow_state);
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}
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static void set_rx_flow_off(struct caifsock *cf_sk)
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{
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clear_bit(RX_FLOW_ON_BIT,
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(void *) &cf_sk->flow_state);
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}
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static void set_rx_flow_on(struct caifsock *cf_sk)
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{
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set_bit(RX_FLOW_ON_BIT,
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(void *) &cf_sk->flow_state);
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}
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static void set_tx_flow_off(struct caifsock *cf_sk)
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{
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clear_bit(TX_FLOW_ON_BIT,
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(void *) &cf_sk->flow_state);
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}
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static void set_tx_flow_on(struct caifsock *cf_sk)
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{
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set_bit(TX_FLOW_ON_BIT,
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(void *) &cf_sk->flow_state);
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}
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static void caif_read_lock(struct sock *sk)
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{
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struct caifsock *cf_sk;
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cf_sk = container_of(sk, struct caifsock, sk);
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mutex_lock(&cf_sk->readlock);
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}
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static void caif_read_unlock(struct sock *sk)
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{
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struct caifsock *cf_sk;
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cf_sk = container_of(sk, struct caifsock, sk);
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mutex_unlock(&cf_sk->readlock);
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}
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static int sk_rcvbuf_lowwater(struct caifsock *cf_sk)
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{
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/* A quarter of full buffer is used a low water mark */
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return cf_sk->sk.sk_rcvbuf / 4;
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}
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static void caif_flow_ctrl(struct sock *sk, int mode)
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{
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struct caifsock *cf_sk;
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cf_sk = container_of(sk, struct caifsock, sk);
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if (cf_sk->layer.dn && cf_sk->layer.dn->modemcmd)
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cf_sk->layer.dn->modemcmd(cf_sk->layer.dn, mode);
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}
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/*
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* Copied from sock.c:sock_queue_rcv_skb(), but changed so packets are
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* not dropped, but CAIF is sending flow off instead.
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*/
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static int caif_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
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{
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int err;
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int skb_len;
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unsigned long flags;
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struct sk_buff_head *list = &sk->sk_receive_queue;
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struct caifsock *cf_sk = container_of(sk, struct caifsock, sk);
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if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >=
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(unsigned)sk->sk_rcvbuf && rx_flow_is_on(cf_sk)) {
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if (net_ratelimit())
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pr_debug("sending flow OFF (queue len = %d %d)\n",
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atomic_read(&cf_sk->sk.sk_rmem_alloc),
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sk_rcvbuf_lowwater(cf_sk));
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set_rx_flow_off(cf_sk);
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dbfs_atomic_inc(&cnt.num_rx_flow_off);
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caif_flow_ctrl(sk, CAIF_MODEMCMD_FLOW_OFF_REQ);
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}
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err = sk_filter(sk, skb);
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if (err)
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return err;
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if (!sk_rmem_schedule(sk, skb->truesize) && rx_flow_is_on(cf_sk)) {
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set_rx_flow_off(cf_sk);
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if (net_ratelimit())
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pr_debug("sending flow OFF due to rmem_schedule\n");
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dbfs_atomic_inc(&cnt.num_rx_flow_off);
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caif_flow_ctrl(sk, CAIF_MODEMCMD_FLOW_OFF_REQ);
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}
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skb->dev = NULL;
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skb_set_owner_r(skb, sk);
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/* Cache the SKB length before we tack it onto the receive
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* queue. Once it is added it no longer belongs to us and
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* may be freed by other threads of control pulling packets
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* from the queue.
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*/
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skb_len = skb->len;
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spin_lock_irqsave(&list->lock, flags);
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if (!sock_flag(sk, SOCK_DEAD))
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__skb_queue_tail(list, skb);
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spin_unlock_irqrestore(&list->lock, flags);
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if (!sock_flag(sk, SOCK_DEAD))
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sk->sk_data_ready(sk, skb_len);
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else
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kfree_skb(skb);
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return 0;
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}
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/* Packet Receive Callback function called from CAIF Stack */
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static int caif_sktrecv_cb(struct cflayer *layr, struct cfpkt *pkt)
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{
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struct caifsock *cf_sk;
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struct sk_buff *skb;
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cf_sk = container_of(layr, struct caifsock, layer);
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skb = cfpkt_tonative(pkt);
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if (unlikely(cf_sk->sk.sk_state != CAIF_CONNECTED)) {
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kfree_skb(skb);
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return 0;
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}
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caif_queue_rcv_skb(&cf_sk->sk, skb);
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return 0;
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}
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static void cfsk_hold(struct cflayer *layr)
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{
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struct caifsock *cf_sk = container_of(layr, struct caifsock, layer);
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sock_hold(&cf_sk->sk);
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}
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static void cfsk_put(struct cflayer *layr)
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{
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struct caifsock *cf_sk = container_of(layr, struct caifsock, layer);
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sock_put(&cf_sk->sk);
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}
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/* Packet Control Callback function called from CAIF */
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static void caif_ctrl_cb(struct cflayer *layr,
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enum caif_ctrlcmd flow,
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int phyid)
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{
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struct caifsock *cf_sk = container_of(layr, struct caifsock, layer);
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switch (flow) {
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case CAIF_CTRLCMD_FLOW_ON_IND:
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/* OK from modem to start sending again */
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dbfs_atomic_inc(&cnt.num_tx_flow_on_ind);
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set_tx_flow_on(cf_sk);
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cf_sk->sk.sk_state_change(&cf_sk->sk);
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break;
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case CAIF_CTRLCMD_FLOW_OFF_IND:
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/* Modem asks us to shut up */
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dbfs_atomic_inc(&cnt.num_tx_flow_off_ind);
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set_tx_flow_off(cf_sk);
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cf_sk->sk.sk_state_change(&cf_sk->sk);
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break;
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case CAIF_CTRLCMD_INIT_RSP:
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/* We're now connected */
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caif_client_register_refcnt(&cf_sk->layer,
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cfsk_hold, cfsk_put);
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dbfs_atomic_inc(&cnt.num_connect_resp);
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cf_sk->sk.sk_state = CAIF_CONNECTED;
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set_tx_flow_on(cf_sk);
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cf_sk->sk.sk_state_change(&cf_sk->sk);
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break;
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case CAIF_CTRLCMD_DEINIT_RSP:
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/* We're now disconnected */
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cf_sk->sk.sk_state = CAIF_DISCONNECTED;
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cf_sk->sk.sk_state_change(&cf_sk->sk);
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break;
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case CAIF_CTRLCMD_INIT_FAIL_RSP:
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/* Connect request failed */
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dbfs_atomic_inc(&cnt.num_connect_fail_resp);
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cf_sk->sk.sk_err = ECONNREFUSED;
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cf_sk->sk.sk_state = CAIF_DISCONNECTED;
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cf_sk->sk.sk_shutdown = SHUTDOWN_MASK;
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/*
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* Socket "standards" seems to require POLLOUT to
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* be set at connect failure.
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*/
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set_tx_flow_on(cf_sk);
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cf_sk->sk.sk_state_change(&cf_sk->sk);
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break;
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case CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND:
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/* Modem has closed this connection, or device is down. */
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dbfs_atomic_inc(&cnt.num_remote_shutdown_ind);
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cf_sk->sk.sk_shutdown = SHUTDOWN_MASK;
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cf_sk->sk.sk_err = ECONNRESET;
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set_rx_flow_on(cf_sk);
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cf_sk->sk.sk_error_report(&cf_sk->sk);
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break;
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default:
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pr_debug("Unexpected flow command %d\n", flow);
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}
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}
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static void caif_check_flow_release(struct sock *sk)
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{
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struct caifsock *cf_sk = container_of(sk, struct caifsock, sk);
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if (rx_flow_is_on(cf_sk))
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return;
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if (atomic_read(&sk->sk_rmem_alloc) <= sk_rcvbuf_lowwater(cf_sk)) {
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dbfs_atomic_inc(&cnt.num_rx_flow_on);
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set_rx_flow_on(cf_sk);
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caif_flow_ctrl(sk, CAIF_MODEMCMD_FLOW_ON_REQ);
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}
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}
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/*
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* Copied from unix_dgram_recvmsg, but removed credit checks,
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* changed locking, address handling and added MSG_TRUNC.
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*/
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static int caif_seqpkt_recvmsg(struct kiocb *iocb, struct socket *sock,
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struct msghdr *m, size_t len, int flags)
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{
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struct sock *sk = sock->sk;
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struct sk_buff *skb;
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int ret;
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int copylen;
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ret = -EOPNOTSUPP;
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if (m->msg_flags&MSG_OOB)
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goto read_error;
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skb = skb_recv_datagram(sk, flags, 0 , &ret);
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if (!skb)
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goto read_error;
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copylen = skb->len;
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if (len < copylen) {
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m->msg_flags |= MSG_TRUNC;
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copylen = len;
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}
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ret = skb_copy_datagram_iovec(skb, 0, m->msg_iov, copylen);
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if (ret)
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goto out_free;
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ret = (flags & MSG_TRUNC) ? skb->len : copylen;
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out_free:
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skb_free_datagram(sk, skb);
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caif_check_flow_release(sk);
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return ret;
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read_error:
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return ret;
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}
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/* Copied from unix_stream_wait_data, identical except for lock call. */
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static long caif_stream_data_wait(struct sock *sk, long timeo)
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{
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DEFINE_WAIT(wait);
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lock_sock(sk);
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for (;;) {
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prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
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if (!skb_queue_empty(&sk->sk_receive_queue) ||
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sk->sk_err ||
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sk->sk_state != CAIF_CONNECTED ||
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sock_flag(sk, SOCK_DEAD) ||
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(sk->sk_shutdown & RCV_SHUTDOWN) ||
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signal_pending(current) ||
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!timeo)
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break;
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set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
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release_sock(sk);
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timeo = schedule_timeout(timeo);
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lock_sock(sk);
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clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
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}
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finish_wait(sk_sleep(sk), &wait);
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release_sock(sk);
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return timeo;
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}
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/*
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* Copied from unix_stream_recvmsg, but removed credit checks,
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* changed locking calls, changed address handling.
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*/
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static int caif_stream_recvmsg(struct kiocb *iocb, struct socket *sock,
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struct msghdr *msg, size_t size,
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int flags)
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{
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struct sock *sk = sock->sk;
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int copied = 0;
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int target;
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int err = 0;
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long timeo;
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err = -EOPNOTSUPP;
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if (flags&MSG_OOB)
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goto out;
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msg->msg_namelen = 0;
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/*
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* Lock the socket to prevent queue disordering
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* while sleeps in memcpy_tomsg
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*/
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err = -EAGAIN;
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if (sk->sk_state == CAIF_CONNECTING)
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goto out;
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caif_read_lock(sk);
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target = sock_rcvlowat(sk, flags&MSG_WAITALL, size);
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timeo = sock_rcvtimeo(sk, flags&MSG_DONTWAIT);
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do {
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int chunk;
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struct sk_buff *skb;
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lock_sock(sk);
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skb = skb_dequeue(&sk->sk_receive_queue);
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caif_check_flow_release(sk);
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if (skb == NULL) {
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if (copied >= target)
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goto unlock;
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/*
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* POSIX 1003.1g mandates this order.
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*/
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err = sock_error(sk);
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if (err)
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goto unlock;
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err = -ECONNRESET;
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if (sk->sk_shutdown & RCV_SHUTDOWN)
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goto unlock;
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err = -EPIPE;
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if (sk->sk_state != CAIF_CONNECTED)
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goto unlock;
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if (sock_flag(sk, SOCK_DEAD))
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goto unlock;
|
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release_sock(sk);
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err = -EAGAIN;
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if (!timeo)
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break;
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|
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caif_read_unlock(sk);
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timeo = caif_stream_data_wait(sk, timeo);
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|
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if (signal_pending(current)) {
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err = sock_intr_errno(timeo);
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goto out;
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}
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caif_read_lock(sk);
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continue;
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unlock:
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release_sock(sk);
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break;
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}
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release_sock(sk);
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chunk = min_t(unsigned int, skb->len, size);
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if (memcpy_toiovec(msg->msg_iov, skb->data, chunk)) {
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skb_queue_head(&sk->sk_receive_queue, skb);
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if (copied == 0)
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copied = -EFAULT;
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break;
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}
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copied += chunk;
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size -= chunk;
|
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|
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/* Mark read part of skb as used */
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if (!(flags & MSG_PEEK)) {
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skb_pull(skb, chunk);
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|
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/* put the skb back if we didn't use it up. */
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if (skb->len) {
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skb_queue_head(&sk->sk_receive_queue, skb);
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break;
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}
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kfree_skb(skb);
|
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|
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} else {
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/*
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* It is questionable, see note in unix_dgram_recvmsg.
|
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*/
|
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/* put message back and return */
|
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skb_queue_head(&sk->sk_receive_queue, skb);
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break;
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}
|
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} while (size);
|
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caif_read_unlock(sk);
|
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|
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out:
|
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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(skb->cb, 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)
|
|
/* skb is already freed */
|
|
return ret;
|
|
|
|
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(sock_net(sk), &cf_sk->layer);
|
|
caif_free_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 comming 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(sock_net(sk), &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);
|
|
|
|
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_bh(&sk->sk_receive_queue.lock);
|
|
sock_set_flag(sk, SOCK_DEAD);
|
|
spin_unlock_bh(&sk->sk_receive_queue.lock);
|
|
sock->sk = NULL;
|
|
|
|
dbfs_atomic_inc(&cnt.num_disconnect);
|
|
|
|
WARN_ON(IS_ERR(cf_sk->debugfs_socket_dir));
|
|
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;
|
|
|
|
caif_disconnect_client(sock_net(sk), &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 0;
|
|
}
|
|
|
|
/* 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_debug("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)
|
|
{
|
|
int num;
|
|
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);
|
|
num = dbfs_atomic_inc(&cnt.caif_sock_create);
|
|
#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", num);
|
|
|
|
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_create", S_IRUSR | S_IWUSR,
|
|
debugfsdir,
|
|
(u32 *) &cnt.caif_sock_create);
|
|
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);
|