From 40ba84993d66469d336099c5af74c3da5b73e28d Mon Sep 17 00:00:00 2001 From: "Jorge Boncompte [DTI2]" Date: Mon, 21 Nov 2011 10:25:58 +0000 Subject: [PATCH] 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] Signed-off-by: David S. Miller --- net/atm/common.c | 14 +++++++++++--- 1 file changed, 11 insertions(+), 3 deletions(-) diff --git a/net/atm/common.c b/net/atm/common.c index 0b4c58fe..b4b44db 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; } -- 2.7.4