diff options
| author | Yonglong Li | 2021-04-23 11:17:08 -0700 |
|---|---|---|
| committer | David S. Miller | 2021-04-23 14:06:32 -0700 |
| commit | ca4fb892579f110d3ab4865eb2aef36be7683a7c (patch) | |
| tree | 55284c6f20d8a40350974208b61c11e03b216e25 /net | |
| parent | 987858e5d026d355535b34f17c6ceeb1d71ccf75 (diff) | |
mptcp: add MSG_PEEK support
This patch adds support for MSG_PEEK flag. Packets are not removed
from the receive_queue if MSG_PEEK set in recv() system call.
Acked-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Yonglong Li <liyonglong@chinatelecom.cn>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/mptcp/protocol.c | 22 |
1 files changed, 13 insertions, 9 deletions
diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c index a996dd5bb0c2..8bf21996734d 100644 --- a/net/mptcp/protocol.c +++ b/net/mptcp/protocol.c @@ -1745,10 +1745,10 @@ static int __mptcp_recvmsg_mskq(struct mptcp_sock *msk, struct msghdr *msg, size_t len, int flags) { - struct sk_buff *skb; + struct sk_buff *skb, *tmp; int copied = 0; - while ((skb = skb_peek(&msk->receive_queue)) != NULL) { + skb_queue_walk_safe(&msk->receive_queue, skb, tmp) { u32 offset = MPTCP_SKB_CB(skb)->offset; u32 data_len = skb->len - offset; u32 count = min_t(size_t, len - copied, data_len); @@ -1766,15 +1766,18 @@ static int __mptcp_recvmsg_mskq(struct mptcp_sock *msk, copied += count; if (count < data_len) { - MPTCP_SKB_CB(skb)->offset += count; + if (!(flags & MSG_PEEK)) + MPTCP_SKB_CB(skb)->offset += count; break; } - /* we will bulk release the skb memory later */ - skb->destructor = NULL; - msk->rmem_released += skb->truesize; - __skb_unlink(skb, &msk->receive_queue); - __kfree_skb(skb); + if (!(flags & MSG_PEEK)) { + /* we will bulk release the skb memory later */ + skb->destructor = NULL; + msk->rmem_released += skb->truesize; + __skb_unlink(skb, &msk->receive_queue); + __kfree_skb(skb); + } if (copied >= len) break; @@ -2053,7 +2056,8 @@ out_err: pr_debug("msk=%p data_ready=%d rx queue empty=%d copied=%d", msk, test_bit(MPTCP_DATA_READY, &msk->flags), skb_queue_empty_lockless(&sk->sk_receive_queue), copied); - mptcp_rcv_space_adjust(msk, copied); + if (!(flags & MSG_PEEK)) + mptcp_rcv_space_adjust(msk, copied); release_sock(sk); return copied; |