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authorRainer Weikusat <rweikusat@mobileactivedefense.com>2015-12-07 00:11:34 +0300
committerDavid S. Miller <davem@davemloft.net>2015-12-07 07:31:54 +0300
commitea3793ee29d3621faf857fa8ef5425e9ff9a756d (patch)
treeb10d2b97a880215baf803b25c86bd318db3b4627 /include/linux/skbuff.h
parent7bf9ae016efc0cf08263fbee5ac708c23b90792e (diff)
downloadlinux-ea3793ee29d3621faf857fa8ef5425e9ff9a756d.tar.xz
core: enable more fine-grained datagram reception control
The __skb_recv_datagram routine in core/ datagram.c provides a general skb reception factility supposed to be utilized by protocol modules providing datagram sockets. It encompasses both the actual recvmsg code and a surrounding 'sleep until data is available' loop. This is inconvenient if a protocol module has to use additional locking in order to maintain some per-socket state the generic datagram socket code is unaware of (as the af_unix code does). The patch below moves the recvmsg proper code into a new __skb_try_recv_datagram routine which doesn't sleep and renames wait_for_more_packets to __skb_wait_for_more_packets, both routines being exported interfaces. The original __skb_recv_datagram routine is reimplemented on top of these two functions such that its user-visible behaviour remains unchanged. Signed-off-by: Rainer Weikusat <rweikusat@mobileactivedefense.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux/skbuff.h')
-rw-r--r--include/linux/skbuff.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index c9c394bf0771..9b9b9ead7bb3 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -2785,6 +2785,12 @@ static inline void skb_frag_list_init(struct sk_buff *skb)
#define skb_walk_frags(skb, iter) \
for (iter = skb_shinfo(skb)->frag_list; iter; iter = iter->next)
+
+int __skb_wait_for_more_packets(struct sock *sk, int *err, long *timeo_p,
+ const struct sk_buff *skb);
+struct sk_buff *__skb_try_recv_datagram(struct sock *sk, unsigned flags,
+ int *peeked, int *off, int *err,
+ struct sk_buff **last);
struct sk_buff *__skb_recv_datagram(struct sock *sk, unsigned flags,
int *peeked, int *off, int *err);
struct sk_buff *skb_recv_datagram(struct sock *sk, unsigned flags, int noblock,