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mptcp: pm: ADD_ADDR 0 is not a new address

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The ADD_ADDR 0 with the address from the initial subflow should not be
considered as a new address: this is not something new. If the host
receives it, it simply means that the address is available again.

When receiving an ADD_ADDR for the ID 0, the PM already doesn't consider
it as new by not incrementing the 'add_addr_accepted' counter. But the
'accept_addr' might not be set if the limit has already been reached:
this can be bypassed in this case. But before, it is important to check
that this ADD_ADDR for the ID 0 is for the same address as the initial
subflow. If not, it is not something that should happen, and the
ADD_ADDR can be ignored.

Note that if an ADD_ADDR is received while there is already a subflow
opened using the same address, this ADD_ADDR is ignored as well. It
means that if multiple ADD_ADDR for ID 0 are received, there will not be
any duplicated subflows created by the client.

Fixes: d0876b2284 ("mptcp: add the incoming RM_ADDR support")
Cc: stable@vger.kernel.org
Reviewed-by: Mat Martineau <martineau@kernel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Matthieu Baerts (NGI0) 2024-08-28 08:14:37 +02:00 committed by Paolo Abeni
parent 20ccc7c5f7
commit 57f86203b4
3 changed files with 14 additions and 1 deletions
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4
net/mptcp/pm.c
View file

@ -226,7 +226,9 @@ void mptcp_pm_add_addr_received(const struct sock *ssk,
} else {
__MPTCP_INC_STATS(sock_net((struct sock *)msk), MPTCP_MIB_ADDADDRDROP);
}
} else if (!READ_ONCE(pm->accept_addr)) {
/* id0 should not have a different address */
} else if ((addr->id == 0 && !mptcp_pm_nl_is_init_remote_addr(msk, addr)) ||
(addr->id > 0 && !READ_ONCE(pm->accept_addr))) {
mptcp_pm_announce_addr(msk, addr, true);
mptcp_pm_add_addr_send_ack(msk);
} else if (mptcp_pm_schedule_work(msk, MPTCP_PM_ADD_ADDR_RECEIVED)) {

9
net/mptcp/pm_netlink.c
View file

@ -760,6 +760,15 @@ static void mptcp_pm_nl_add_addr_received(struct mptcp_sock *msk)
}
}
bool mptcp_pm_nl_is_init_remote_addr(struct mptcp_sock *msk,
const struct mptcp_addr_info *remote)
{
struct mptcp_addr_info mpc_remote;
remote_address((struct sock_common *)msk, &mpc_remote);
return mptcp_addresses_equal(&mpc_remote, remote, remote->port);
}
void mptcp_pm_nl_addr_send_ack(struct mptcp_sock *msk)
{
struct mptcp_subflow_context *subflow;

2
net/mptcp/protocol.h
View file

@ -993,6 +993,8 @@ void mptcp_pm_add_addr_received(const struct sock *ssk,
void mptcp_pm_add_addr_echoed(struct mptcp_sock *msk,
const struct mptcp_addr_info *addr);
void mptcp_pm_add_addr_send_ack(struct mptcp_sock *msk);
bool mptcp_pm_nl_is_init_remote_addr(struct mptcp_sock *msk,
const struct mptcp_addr_info *remote);
void mptcp_pm_nl_addr_send_ack(struct mptcp_sock *msk);
void mptcp_pm_rm_addr_received(struct mptcp_sock *msk,
const struct mptcp_rm_list *rm_list);