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authorPaolo Abeni <pabeni@redhat.com>2022-10-21 15:58:54 -0700
committerJakub Kicinski <kuba@kernel.org>2022-10-24 21:13:55 -0700
commite72e4032637f4646554794ac28a3abecc6c2416d (patch)
tree450eaea62bb1923c1b52664e71b4558b079285bc /net
parent4a4b6848d1e932b977e6a00cda393adf7e839ff8 (diff)
mptcp: set msk local address earlier
The mptcp_pm_nl_get_local_id() code assumes that the msk local address is available at that point. For passive sockets, we initialize such address at accept() time. Depending on the running configuration and the user-space timing, a passive MPJ subflow can join the msk socket before accept() completes. In such case, the PM assigns a wrong local id to the MPJ subflow and later PM netlink operations will end-up touching the wrong/unexpected subflow. All the above causes sporadic self-tests failures, especially when the host is heavy loaded. Closes: https://github.com/multipath-tcp/mptcp_net-next/issues/308 Fixes: 01cacb00b35c ("mptcp: add netlink-based PM") Fixes: d045b9eb95a9 ("mptcp: introduce implicit endpoints") Reviewed-by: Mat Martineau <mathew.j.martineau@linux.intel.com> Signed-off-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net')
-rw-r--r--net/mptcp/protocol.c3
-rw-r--r--net/mptcp/protocol.h1
-rw-r--r--net/mptcp/subflow.c7
3 files changed, 9 insertions, 2 deletions
diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index f599ad44ed24..e33f9caf409d 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -2952,7 +2952,7 @@ static void mptcp_close(struct sock *sk, long timeout)
sock_put(sk);
}
-static void mptcp_copy_inaddrs(struct sock *msk, const struct sock *ssk)
+void mptcp_copy_inaddrs(struct sock *msk, const struct sock *ssk)
{
#if IS_ENABLED(CONFIG_MPTCP_IPV6)
const struct ipv6_pinfo *ssk6 = inet6_sk(ssk);
@@ -3699,7 +3699,6 @@ static int mptcp_stream_accept(struct socket *sock, struct socket *newsock,
if (mptcp_is_fully_established(newsk))
mptcp_pm_fully_established(msk, msk->first, GFP_KERNEL);
- mptcp_copy_inaddrs(newsk, msk->first);
mptcp_rcv_space_init(msk, msk->first);
mptcp_propagate_sndbuf(newsk, msk->first);
diff --git a/net/mptcp/protocol.h b/net/mptcp/protocol.h
index c0b5b4628f65..be19592441df 100644
--- a/net/mptcp/protocol.h
+++ b/net/mptcp/protocol.h
@@ -599,6 +599,7 @@ int mptcp_is_checksum_enabled(const struct net *net);
int mptcp_allow_join_id0(const struct net *net);
unsigned int mptcp_stale_loss_cnt(const struct net *net);
int mptcp_get_pm_type(const struct net *net);
+void mptcp_copy_inaddrs(struct sock *msk, const struct sock *ssk);
void mptcp_subflow_fully_established(struct mptcp_subflow_context *subflow,
struct mptcp_options_received *mp_opt);
bool __mptcp_retransmit_pending_data(struct sock *sk);
diff --git a/net/mptcp/subflow.c b/net/mptcp/subflow.c
index 07dd23d0fe04..02a54d59697b 100644
--- a/net/mptcp/subflow.c
+++ b/net/mptcp/subflow.c
@@ -723,6 +723,8 @@ create_child:
goto dispose_child;
}
+ if (new_msk)
+ mptcp_copy_inaddrs(new_msk, child);
subflow_drop_ctx(child);
goto out;
}
@@ -750,6 +752,11 @@ create_child:
ctx->conn = new_msk;
new_msk = NULL;
+ /* set msk addresses early to ensure mptcp_pm_get_local_id()
+ * uses the correct data
+ */
+ mptcp_copy_inaddrs(ctx->conn, child);
+
/* with OoO packets we can reach here without ingress
* mpc option
*/