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| author |   Yonglong Li <liyonglong@chinatelecom.cn> | 2022-03-17 15:14:44 -0700 |
|---|---|---|
| committer |   Jakub Kicinski <kuba@kernel.org> | 2022-03-18 14:14:09 -0700 |
| commit | 12a18341b5c3b6b897e52e8f387ab7cd7f7b6d85 (patch) | |
| tree | e5211d65a596bf7c92b333a6e3e86b85adc65e0b /net | |
| parent | af_unix: Remove unnecessary brackets around CONFIG_AF_UNIX_OOB. (diff) | |
| download | linux-dev-12a18341b5c3b6b897e52e8f387ab7cd7f7b6d85.tar.xz linux-dev-12a18341b5c3b6b897e52e8f387ab7cd7f7b6d85.zip | |
mptcp: send ADD_ADDR echo before create subflows
In some corner cases, the peer handing an incoming ADD_ADDR option, can
receive a retransmitted ADD_ADDR for the same address before the subflow
creation completes.
We can avoid the above issue by generating and sending the ADD_ADDR echo
before starting the MPJ subflow connection.
This slightly changes the behaviour of the packetdrill tests as the
ADD_ADDR echo packet is sent earlier.
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>
Link: https://lore.kernel.org/r/20220317221444.426335-1-mathew.j.martineau@linux.intel.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net')
| -rw-r--r-- | net/mptcp/pm_netlink.c | 18 |
1 files changed, 5 insertions, 13 deletions
diff --git a/net/mptcp/pm_netlink.c b/net/mptcp/pm_netlink.c index 800515fe5e1d..b5e8de6f7507 100644 --- a/net/mptcp/pm_netlink.c +++ b/net/mptcp/pm_netlink.c @@ -650,7 +650,6 @@ static void mptcp_pm_nl_add_addr_received(struct mptcp_sock *msk) unsigned int add_addr_accept_max; struct mptcp_addr_info remote; unsigned int subflows_max; - bool reset_port = false; int i, nr; add_addr_accept_max = mptcp_pm_get_add_addr_accept_max(msk); @@ -661,14 +660,15 @@ static void mptcp_pm_nl_add_addr_received(struct mptcp_sock *msk) msk->pm.remote.family); remote = msk->pm.remote; + mptcp_pm_announce_addr(msk, &remote, true); + mptcp_pm_nl_addr_send_ack(msk); + if (lookup_subflow_by_daddr(&msk->conn_list, &remote)) - goto add_addr_echo; + return; /* pick id 0 port, if none is provided the remote address */ - if (!remote.port) { - reset_port = true; + if (!remote.port) remote.port = sk->sk_dport; - } /* connect to the specified remote address, using whatever * local address the routing configuration will pick. @@ -684,14 +684,6 @@ static void mptcp_pm_nl_add_addr_received(struct mptcp_sock *msk) for (i = 0; i < nr; i++) __mptcp_subflow_connect(sk, &addrs[i], &remote); spin_lock_bh(&msk->pm.lock); - - /* be sure to echo exactly the received address */ - if (reset_port) - remote.port = 0; - -add_addr_echo: - mptcp_pm_announce_addr(msk, &remote, true); - mptcp_pm_nl_addr_send_ack(msk); } void mptcp_pm_nl_addr_send_ack(struct mptcp_sock *msk) |