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| author | Jorge Boncompte [DTI2] <jorge@dti2.net> | 2011-11-21 11:25:58 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2011-11-22 22:15:49 +0100 |
| commit | 40ba84993d66469d336099c5af74c3da5b73e28d (patch) | |
| tree | 3935df24cbdc9faab02e42342d24b48f5b0c0b11 | |
| parent | atm: Introduce vcc_process_recv_queue (diff) | |
| download | linux-40ba84993d66469d336099c5af74c3da5b73e28d.tar.xz linux-40ba84993d66469d336099c5af74c3da5b73e28d.zip | |
atm: Allow MSG_PEEK for atm sockets
Now that the vcc backends do the right thing with respect the receive
queue on registration, allow MSK_PEEK for atm sockets.
This allows a userspace program to inspect the packets and decide what
backend to use to handle them.
Signed-off-by: Jorge Boncompte [DTI2] <jorge@dti2.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/atm/common.c | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/net/atm/common.c b/net/atm/common.c index 0b4c58fe3919..b4b44dbed645 100644 --- a/net/atm/common.c +++ b/net/atm/common.c @@ -522,8 +522,11 @@ int vcc_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, if (sock->state != SS_CONNECTED) return -ENOTCONN; - if (flags & ~MSG_DONTWAIT) /* only handle MSG_DONTWAIT */ + + /* only handle MSG_DONTWAIT and MSG_PEEK */ + if (flags & ~(MSG_DONTWAIT | MSG_PEEK)) return -EOPNOTSUPP; + vcc = ATM_SD(sock); if (test_bit(ATM_VF_RELEASED, &vcc->flags) || test_bit(ATM_VF_CLOSE, &vcc->flags) || @@ -544,8 +547,13 @@ int vcc_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, if (error) return error; sock_recv_ts_and_drops(msg, sk, skb); - pr_debug("%d -= %d\n", atomic_read(&sk->sk_rmem_alloc), skb->truesize); - atm_return(vcc, skb->truesize); + + if (!(flags & MSG_PEEK)) { + pr_debug("%d -= %d\n", atomic_read(&sk->sk_rmem_alloc), + skb->truesize); + atm_return(vcc, skb->truesize); + } + skb_free_datagram(sk, skb); return copied; } |