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Phonet: receive pipe control requests as out-of-band data

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Signed-off-by: Rémi Denis-Courmont <remi.denis-courmont@nokia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Rémi Denis-Courmont 2008-10-05 11:15:43 -07:00 committed by David S. Miller
parent 9641458d3e
commit c41bd97f81
3 changed files with 52 additions and 19 deletions
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2
include/net/phonet/pep.h
View File

@ -33,6 +33,8 @@ struct pep_sock {
/* Connected socket stuff: */
struct sock *listener;
struct sk_buff_head ctrlreq_queue;
#define PNPIPE_CTRLREQ_MAX 10
u16 peer_type; /* peer type/subtype */
u8 pipe_handle;

65
net/phonet/pep.c
View File

@ -137,14 +137,15 @@ static int pep_reject_conn(struct sock *sk, struct sk_buff *skb, u8 code)
/* Control requests are not sent by the pipe service and have a specific
* message format. */
static int pep_ctrlreq_error(struct sock *sk, struct sk_buff *oskb, u8 code)
static int pep_ctrlreq_error(struct sock *sk, struct sk_buff *oskb, u8 code,
gfp_t priority)
{
const struct pnpipehdr *oph = pnp_hdr(oskb);
struct sk_buff *skb;
struct pnpipehdr *ph;
struct sockaddr_pn dst;
skb = alloc_skb(MAX_PNPIPE_HEADER + 4, GFP_ATOMIC);
skb = alloc_skb(MAX_PNPIPE_HEADER + 4, priority);
if (!skb)
return -ENOMEM;
skb_set_owner_w(skb, sk);
@ -305,6 +306,7 @@ static int pipe_do_rcv(struct sock *sk, struct sk_buff *skb)
{
struct pep_sock *pn = pep_sk(sk);
struct pnpipehdr *hdr = pnp_hdr(skb);
struct sk_buff_head *queue;
int err = 0;
BUG_ON(sk->sk_state == TCP_CLOSE_WAIT);
@ -345,9 +347,11 @@ static int pipe_do_rcv(struct sock *sk, struct sk_buff *skb)
break;
case PNS_PEP_CTRL_REQ:
/* TODO */
pep_ctrlreq_error(sk, skb, PN_PIPE_NO_ERROR);
break;
if (skb_queue_len(&pn->ctrlreq_queue) >= PNPIPE_CTRLREQ_MAX)
break;
__skb_pull(skb, 4);
queue = &pn->ctrlreq_queue;
goto queue;
case PNS_PIPE_DATA:
__skb_pull(skb, 3); /* Pipe data header */
@ -363,13 +367,8 @@ static int pipe_do_rcv(struct sock *sk, struct sk_buff *skb)
break;
}
pn->rx_credits--;
skb->dev = NULL;
skb_set_owner_r(skb, sk);
err = skb->len;
skb_queue_tail(&sk->sk_receive_queue, skb);
if (!sock_flag(sk, SOCK_DEAD))
sk->sk_data_ready(sk, err);
return 0;
queue = &sk->sk_receive_queue;
goto queue;
case PNS_PEP_STATUS_IND:
pipe_rcv_status(sk, skb);
@ -412,12 +411,24 @@ static int pipe_do_rcv(struct sock *sk, struct sk_buff *skb)
out:
kfree_skb(skb);
return err;
queue:
skb->dev = NULL;
skb_set_owner_r(skb, sk);
err = skb->len;
skb_queue_tail(queue, skb);
if (!sock_flag(sk, SOCK_DEAD))
sk->sk_data_ready(sk, err);
return 0;
}
/* Destroy connected sock. */
static void pipe_destruct(struct sock *sk)
{
struct pep_sock *pn = pep_sk(sk);
skb_queue_purge(&sk->sk_receive_queue);
skb_queue_purge(&pn->ctrlreq_queue);
}
static int pep_connreq_rcv(struct sock *sk, struct sk_buff *skb)
@ -490,6 +501,7 @@ static int pep_connreq_rcv(struct sock *sk, struct sk_buff *skb)
pn_skb_get_dst_sockaddr(skb, &dst);
newpn->pn_sk.sobject = pn_sockaddr_get_object(&dst);
newpn->pn_sk.resource = pn->pn_sk.resource;
skb_queue_head_init(&newpn->ctrlreq_queue);
newpn->pipe_handle = pipe_handle;
newpn->peer_type = peer_type;
newpn->rx_credits = newpn->tx_credits = 0;
@ -581,7 +593,7 @@ static int pep_do_rcv(struct sock *sk, struct sk_buff *skb)
break;
case PNS_PEP_CTRL_REQ:
pep_ctrlreq_error(sk, skb, PN_PIPE_INVALID_HANDLE);
pep_ctrlreq_error(sk, skb, PN_PIPE_INVALID_HANDLE, GFP_ATOMIC);
break;
case PNS_PEP_RESET_REQ:
@ -684,6 +696,7 @@ out:
static int pep_ioctl(struct sock *sk, int cmd, unsigned long arg)
{
struct pep_sock *pn = pep_sk(sk);
int answ;
switch (cmd) {
@ -692,7 +705,10 @@ static int pep_ioctl(struct sock *sk, int cmd, unsigned long arg)
return -EINVAL;
lock_sock(sk);
if (!skb_queue_empty(&sk->sk_receive_queue))
if (sock_flag(sk, SOCK_URGINLINE)
&& !skb_queue_empty(&pn->ctrlreq_queue))
answ = skb_peek(&pn->ctrlreq_queue)->len;
else if (!skb_queue_empty(&sk->sk_receive_queue))
answ = skb_peek(&sk->sk_receive_queue)->len;
else
answ = 0;
@ -709,6 +725,7 @@ static int pep_init(struct sock *sk)
INIT_HLIST_HEAD(&pn->ackq);
INIT_HLIST_HEAD(&pn->hlist);
skb_queue_head_init(&pn->ctrlreq_queue);
pn->pipe_handle = PN_PIPE_INVALID_HANDLE;
return 0;
}
@ -810,11 +827,24 @@ static int pep_recvmsg(struct kiocb *iocb, struct sock *sk,
struct sk_buff *skb;
int err;
if (unlikely(flags & MSG_OOB))
return -EOPNOTSUPP;
if (unlikely(1 << sk->sk_state & (TCPF_LISTEN | TCPF_CLOSE)))
return -ENOTCONN;
if ((flags & MSG_OOB) || sock_flag(sk, SOCK_URGINLINE)) {
/* Dequeue and acknowledge control request */
struct pep_sock *pn = pep_sk(sk);
skb = skb_dequeue(&pn->ctrlreq_queue);
if (skb) {
pep_ctrlreq_error(sk, skb, PN_PIPE_NO_ERROR,
GFP_KERNEL);
msg->msg_flags |= MSG_OOB;
goto copy;
}
if (flags & MSG_OOB)
return -EINVAL;
}
skb = skb_recv_datagram(sk, flags, noblock, &err);
lock_sock(sk);
if (skb == NULL) {
@ -827,9 +857,8 @@ static int pep_recvmsg(struct kiocb *iocb, struct sock *sk,
if (sk->sk_state == TCP_ESTABLISHED)
pipe_grant_credits(sk);
release_sock(sk);
copy:
msg->msg_flags |= MSG_EOR;
if (skb->len > len)
msg->msg_flags |= MSG_TRUNC;
else

4
net/phonet/socket.c
View File

@ -220,7 +220,9 @@ static unsigned int pn_socket_poll(struct file *file, struct socket *sock,
if (!skb_queue_empty(&sk->sk_receive_queue))
mask |= POLLIN | POLLRDNORM;
else if (sk->sk_state == TCP_CLOSE_WAIT)
if (!skb_queue_empty(&pn->ctrlreq_queue))
mask |= POLLPRI;
if (!mask && sk->sk_state == TCP_CLOSE_WAIT)
return POLLHUP;
if (sk->sk_state == TCP_ESTABLISHED && pn->tx_credits)