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[DCCP]: Rewrite dccp_sendmsg to be more like UDP

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Based on discussions with Nishida-san.

Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Arnaldo Carvalho de Melo 2005-08-13 20:35:17 -03:00 committed by David S. Miller
parent 7690af3fff
commit 531669a0a9
1 changed files with 65 additions and 161 deletions
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226
net/dccp/proto.c
View file

@ -214,197 +214,101 @@ int dccp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
goto out_release;
}
EXPORT_SYMBOL(dccp_sendmsg);
int dccp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
size_t len, int nonblock, int flags, int *addr_len)
{
const struct dccp_hdr *dh;
int copied = 0;
unsigned long used;
int err;
int target; /* Read at least this many bytes */
long timeo;
lock_sock(sk);
err = -ENOTCONN;
if (sk->sk_state == DCCP_LISTEN)
if (sk->sk_state == DCCP_LISTEN) {
len = -ENOTCONN;
goto out;
}
timeo = sock_rcvtimeo(sk, nonblock);
/* Urgent data needs to be handled specially. */
if (flags & MSG_OOB)
goto recv_urg;
/* FIXME */
#if 0
seq = &tp->copied_seq;
if (flags & MSG_PEEK) {
peek_seq = tp->copied_seq;
seq = &peek_seq;
}
#endif
target = sock_rcvlowat(sk, flags & MSG_WAITALL, len);
do {
struct sk_buff *skb;
u32 offset;
struct sk_buff *skb = skb_peek(&sk->sk_receive_queue);
/* FIXME */
#if 0
/*
* Are we at urgent data? Stop if we have read anything or
* have SIGURG pending.
*/
if (tp->urg_data && tp->urg_seq == *seq) {
if (copied)
break;
if (signal_pending(current)) {
copied = timeo ? sock_intr_errno(timeo) :
-EAGAIN;
break;
}
if (skb == NULL)
goto verify_sock_status;
dh = dccp_hdr(skb);
if (dh->dccph_type == DCCP_PKT_DATA ||
dh->dccph_type == DCCP_PKT_DATAACK)
goto found_ok_skb;
if (dh->dccph_type == DCCP_PKT_RESET ||
dh->dccph_type == DCCP_PKT_CLOSE) {
dccp_pr_debug("found fin ok!\n");
len = 0;
goto found_fin_ok;
}
#endif
/* Next get a buffer. */
skb = skb_peek(&sk->sk_receive_queue);
do {
if (!skb)
break;
offset = 0;
dh = dccp_hdr(skb);
if (dh->dccph_type == DCCP_PKT_DATA ||
dh->dccph_type == DCCP_PKT_DATAACK)
goto found_ok_skb;
if (dh->dccph_type == DCCP_PKT_RESET ||
dh->dccph_type == DCCP_PKT_CLOSE) {
dccp_pr_debug("found fin ok!\n");
goto found_fin_ok;
}
dccp_pr_debug("packet_type=%s\n",
dccp_packet_name(dh->dccph_type));
BUG_TRAP(flags & MSG_PEEK);
skb = skb->next;
} while (skb != (struct sk_buff *)&sk->sk_receive_queue);
/* Well, if we have backlog, try to process it now yet. */
if (copied >= target && !sk->sk_backlog.tail)
dccp_pr_debug("packet_type=%s\n",
dccp_packet_name(dh->dccph_type));
sk_eat_skb(sk, skb);
verify_sock_status:
if (sock_flag(sk, SOCK_DONE)) {
len = 0;
break;
if (copied) {
if (sk->sk_err ||
sk->sk_state == DCCP_CLOSED ||
(sk->sk_shutdown & RCV_SHUTDOWN) ||
!timeo ||
signal_pending(current) ||
(flags & MSG_PEEK))
break;
} else {
if (sock_flag(sk, SOCK_DONE))
break;
if (sk->sk_err) {
copied = sock_error(sk);
break;
}
if (sk->sk_shutdown & RCV_SHUTDOWN)
break;
if (sk->sk_state == DCCP_CLOSED) {
if (!sock_flag(sk, SOCK_DONE)) {
/* This occurs when user tries to read
* from never connected socket.
*/
copied = -ENOTCONN;
break;
}
break;
}
if (!timeo) {
copied = -EAGAIN;
break;
}
if (signal_pending(current)) {
copied = sock_intr_errno(timeo);
break;
}
}
/* FIXME: cleanup_rbuf(sk, copied); */
if (sk->sk_err) {
len = sock_error(sk);
break;
}
if (copied >= target) {
/* Do not sleep, just process backlog. */
release_sock(sk);
lock_sock(sk);
} else
sk_wait_data(sk, &timeo);
if (sk->sk_shutdown & RCV_SHUTDOWN) {
len = 0;
break;
}
if (sk->sk_state == DCCP_CLOSED) {
if (!sock_flag(sk, SOCK_DONE)) {
/* This occurs when user tries to read
* from never connected socket.
*/
len = -ENOTCONN;
break;
}
len = 0;
break;
}
if (!timeo) {
len = -EAGAIN;
break;
}
if (signal_pending(current)) {
len = sock_intr_errno(timeo);
break;
}
sk_wait_data(sk, &timeo);
continue;
found_ok_skb:
/* Ok so how much can we use? */
used = skb->len - offset;
if (len < used)
used = len;
if (len > skb->len)
len = skb->len;
else if (len < skb->len)
msg->msg_flags |= MSG_TRUNC;
if (!(flags & MSG_TRUNC)) {
err = skb_copy_datagram_iovec(skb, offset,
msg->msg_iov, used);
if (err) {
/* Exception. Bailout! */
if (!copied)
copied = -EFAULT;
break;
}
if (skb_copy_datagram_iovec(skb, 0, msg->msg_iov, len)) {
/* Exception. Bailout! */
len = -EFAULT;
break;
}
copied += used;
len -= used;
/* FIXME: tcp_rcv_space_adjust(sk); */
//skip_copy:
if (used + offset < skb->len)
continue;
if (!(flags & MSG_PEEK))
sk_eat_skb(sk, skb);
continue;
found_fin_ok:
if (!(flags & MSG_PEEK))
sk_eat_skb(sk, skb);
break;
} while (len > 0);
/* According to UNIX98, msg_name/msg_namelen are ignored
* on connected socket. I was just happy when found this 8) --ANK
*/
/* Clean up data we have read: This will do ACK frames. */
/* FIXME: cleanup_rbuf(sk, copied); */
release_sock(sk);
return copied;
} while (1);
out:
release_sock(sk);
return err;
recv_urg:
/* FIXME: err = tcp_recv_urg(sk, timeo, msg, len, flags, addr_len); */
goto out;
return len;
}
static int inet_dccp_listen(struct socket *sock, int backlog)