diff options
| -rw-r--r-- | include/linux/skbuff.h | 2 | ||||
| -rw-r--r-- | net/core/datagram.c | 36 | ||||
| -rw-r--r-- | net/ipv4/udp.c | 15 | ||||
| -rw-r--r-- | net/ipv6/raw.c | 16 | ||||
| -rw-r--r-- | net/ipv6/udp.c | 16 |
5 files changed, 44 insertions, 41 deletions
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h index 8c5d6001a92..97f6580ce03 100644 --- a/include/linux/skbuff.h +++ b/include/linux/skbuff.h @@ -1239,6 +1239,8 @@ extern int skb_copy_and_csum_datagram_iovec(struct sk_buff *skb, int hlen, struct iovec *iov); extern void skb_free_datagram(struct sock *sk, struct sk_buff *skb); +extern void skb_kill_datagram(struct sock *sk, struct sk_buff *skb, + unsigned int flags); extern unsigned int skb_checksum(const struct sk_buff *skb, int offset, int len, unsigned int csum); extern int skb_copy_bits(const struct sk_buff *skb, int offset, diff --git a/net/core/datagram.c b/net/core/datagram.c index 1bcfef51ac5..f8d322e1ea9 100644 --- a/net/core/datagram.c +++ b/net/core/datagram.c @@ -47,6 +47,7 @@ #include <linux/rtnetlink.h> #include <linux/poll.h> #include <linux/highmem.h> +#include <linux/spinlock.h> #include <net/protocol.h> #include <linux/skbuff.h> @@ -200,6 +201,41 @@ void skb_free_datagram(struct sock *sk, struct sk_buff *skb) } /** + * skb_kill_datagram - Free a datagram skbuff forcibly + * @sk: socket + * @skb: datagram skbuff + * @flags: MSG_ flags + * + * This function frees a datagram skbuff that was received by + * skb_recv_datagram. The flags argument must match the one + * used for skb_recv_datagram. + * + * If the MSG_PEEK flag is set, and the packet is still on the + * receive queue of the socket, it will be taken off the queue + * before it is freed. + * + * This function currently only disables BH when acquiring the + * sk_receive_queue lock. Therefore it must not be used in a + * context where that lock is acquired in an IRQ context. + */ + +void skb_kill_datagram(struct sock *sk, struct sk_buff *skb, unsigned int flags) +{ + if (flags & MSG_PEEK) { + spin_lock_bh(&sk->sk_receive_queue.lock); + if (skb == skb_peek(&sk->sk_receive_queue)) { + __skb_unlink(skb, &sk->sk_receive_queue); + atomic_dec(&skb->users); + } + spin_unlock_bh(&sk->sk_receive_queue.lock); + } + + kfree_skb(skb); +} + +EXPORT_SYMBOL(skb_kill_datagram); + +/** * skb_copy_datagram_iovec - Copy a datagram to an iovec. * @skb: buffer to copy * @offset: offset in the buffer to start copying from diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c index 2422a5f7195..012c4621e40 100644 --- a/net/ipv4/udp.c +++ b/net/ipv4/udp.c @@ -846,20 +846,7 @@ out: csum_copy_err: UDP_INC_STATS_BH(UDP_MIB_INERRORS); - /* Clear queue. */ - if (flags&MSG_PEEK) { - int clear = 0; - spin_lock_bh(&sk->sk_receive_queue.lock); - if (skb == skb_peek(&sk->sk_receive_queue)) { - __skb_unlink(skb, &sk->sk_receive_queue); - clear = 1; - } - spin_unlock_bh(&sk->sk_receive_queue.lock); - if (clear) - kfree_skb(skb); - } - - skb_free_datagram(sk, skb); + skb_kill_datagram(sk, skb, flags); if (noblock) return -EAGAIN; diff --git a/net/ipv6/raw.c b/net/ipv6/raw.c index a66900cda2a..66f1d12ea57 100644 --- a/net/ipv6/raw.c +++ b/net/ipv6/raw.c @@ -32,6 +32,7 @@ #include <linux/icmpv6.h> #include <linux/netfilter.h> #include <linux/netfilter_ipv6.h> +#include <linux/skbuff.h> #include <asm/uaccess.h> #include <asm/ioctls.h> #include <asm/bug.h> @@ -433,25 +434,14 @@ out: return err; csum_copy_err: - /* Clear queue. */ - if (flags&MSG_PEEK) { - int clear = 0; - spin_lock_bh(&sk->sk_receive_queue.lock); - if (skb == skb_peek(&sk->sk_receive_queue)) { - __skb_unlink(skb, &sk->sk_receive_queue); - clear = 1; - } - spin_unlock_bh(&sk->sk_receive_queue.lock); - if (clear) - kfree_skb(skb); - } + skb_kill_datagram(sk, skb, flags); /* Error for blocking case is chosen to masquerade as some normal condition. */ err = (flags&MSG_DONTWAIT) ? -EAGAIN : -EHOSTUNREACH; /* FIXME: increment a raw6 drops counter here */ - goto out_free; + goto out; } static int rawv6_push_pending_frames(struct sock *sk, struct flowi *fl, diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c index 5cc8731eb55..d8538dcea81 100644 --- a/net/ipv6/udp.c +++ b/net/ipv6/udp.c @@ -36,6 +36,7 @@ #include <linux/ipv6.h> #include <linux/icmpv6.h> #include <linux/init.h> +#include <linux/skbuff.h> #include <asm/uaccess.h> #include <net/sock.h> @@ -300,20 +301,7 @@ out: return err; csum_copy_err: - /* Clear queue. */ - if (flags&MSG_PEEK) { - int clear = 0; - spin_lock_bh(&sk->sk_receive_queue.lock); - if (skb == skb_peek(&sk->sk_receive_queue)) { - __skb_unlink(skb, &sk->sk_receive_queue); - clear = 1; - } - spin_unlock_bh(&sk->sk_receive_queue.lock); - if (clear) - kfree_skb(skb); - } - - skb_free_datagram(sk, skb); + skb_kill_datagram(sk, skb, flags); if (flags & MSG_DONTWAIT) { UDP6_INC_STATS_USER(UDP_MIB_INERRORS); |