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authorFlorian Westphal <fw@strlen.de>2020-12-10 23:25:03 +0100
committerJakub Kicinski <kuba@kernel.org>2020-12-15 02:30:06 +0100
commit049fe386d35353398eee40ba8d76ab62cb5a24e5 (patch)
treec04519930467e0676c2c15351214e66118c41056 /net/ipv4/tcp_input.c
parentmptcp: hold mptcp socket before calling tcp_done (diff)
downloadlinux-049fe386d35353398eee40ba8d76ab62cb5a24e5.tar.xz
linux-049fe386d35353398eee40ba8d76ab62cb5a24e5.zip
tcp: parse mptcp options contained in reset packets
Because TCP-level resets only affect the subflow, there is a MPTCP option to indicate that the MPTCP-level connection should be closed immediately without a mptcp-level fin exchange. This is the 'MPTCP fast close option'. It can be carried on ack segments or TCP resets. In the latter case, its needed to parse mptcp options also for reset packets so that MPTCP can act accordingly. Next patch will add receive side fastclose support in MPTCP. Acked-by: Matthieu Baerts <matthieu.baerts@tessares.net> Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net/ipv4/tcp_input.c')
-rw-r--r--net/ipv4/tcp_input.c13
1 files changed, 8 insertions, 5 deletions
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index d6ad3b5c38e7..48ee476aa031 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -4218,10 +4218,13 @@ static inline bool tcp_sequence(const struct tcp_sock *tp, u32 seq, u32 end_seq)
}
/* When we get a reset we do this. */
-void tcp_reset(struct sock *sk)
+void tcp_reset(struct sock *sk, struct sk_buff *skb)
{
trace_tcp_receive_reset(sk);
+ if (sk_is_mptcp(sk))
+ mptcp_incoming_options(sk, skb);
+
/* We want the right error as BSD sees it (and indeed as we do). */
switch (sk->sk_state) {
case TCP_SYN_SENT:
@@ -5604,7 +5607,7 @@ static bool tcp_validate_incoming(struct sock *sk, struct sk_buff *skb,
&tp->last_oow_ack_time))
tcp_send_dupack(sk, skb);
} else if (tcp_reset_check(sk, skb)) {
- tcp_reset(sk);
+ tcp_reset(sk, skb);
}
goto discard;
}
@@ -5640,7 +5643,7 @@ static bool tcp_validate_incoming(struct sock *sk, struct sk_buff *skb,
}
if (rst_seq_match)
- tcp_reset(sk);
+ tcp_reset(sk, skb);
else {
/* Disable TFO if RST is out-of-order
* and no data has been received
@@ -6077,7 +6080,7 @@ static int tcp_rcv_synsent_state_process(struct sock *sk, struct sk_buff *skb,
*/
if (th->rst) {
- tcp_reset(sk);
+ tcp_reset(sk, skb);
goto discard;
}
@@ -6519,7 +6522,7 @@ int tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb)
if (TCP_SKB_CB(skb)->end_seq != TCP_SKB_CB(skb)->seq &&
after(TCP_SKB_CB(skb)->end_seq - th->fin, tp->rcv_nxt)) {
NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPABORTONDATA);
- tcp_reset(sk);
+ tcp_reset(sk, skb);
return 1;
}
}