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authorKelly Littlepage2020-05-08 19:58:46 +0000
committerJakub Kicinski2020-05-08 16:09:22 -0700
commitcc4de047b33be247f9c8150d3e496743a49642b8 (patch)
tree9186f31adaac25603b71240bec756b5cda7cb999
parentdd912306ff008891c82cd9f63e8181e47a9cb2fb (diff)
net: tcp: fix rx timestamp behavior for tcp_recvmsg
The stated intent of the original commit is to is to "return the timestamp corresponding to the highest sequence number data returned." The current implementation returns the timestamp for the last byte of the last fully read skb, which is not necessarily the last byte in the recv buffer. This patch converts behavior to the original definition, and to the behavior of the previous draft versions of commit 98aaa913b4ed ("tcp: Extend SOF_TIMESTAMPING_RX_SOFTWARE to TCP recvmsg") which also match this behavior. Fixes: 98aaa913b4ed ("tcp: Extend SOF_TIMESTAMPING_RX_SOFTWARE to TCP recvmsg") Co-developed-by: Iris Liu <iris@onechronos.com> Signed-off-by: Iris Liu <iris@onechronos.com> Signed-off-by: Kelly Littlepage <kelly@onechronos.com> Signed-off-by: Eric Dumazet <edumazet@google.com> Acked-by: Soheil Hassas Yeganeh <soheil@google.com> Acked-by: Willem de Bruijn <willemb@google.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
-rw-r--r--net/ipv4/tcp.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 6d87de434377..e72bd651d21a 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -2154,13 +2154,15 @@ skip_copy:
tp->urg_data = 0;
tcp_fast_path_check(sk);
}
- if (used + offset < skb->len)
- continue;
if (TCP_SKB_CB(skb)->has_rxtstamp) {
tcp_update_recv_tstamps(skb, &tss);
cmsg_flags |= 2;
}
+
+ if (used + offset < skb->len)
+ continue;
+
if (TCP_SKB_CB(skb)->tcp_flags & TCPHDR_FIN)
goto found_fin_ok;
if (!(flags & MSG_PEEK))