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mptcp: add address into userspace pm list 

Add the address into userspace_pm_local_addr_list when the subflow is
created. Make sure it can be found in mptcp_nl_cmd_remove(). And delete
it in the new helper mptcp_userspace_pm_delete_local_addr().

By doing this, the "REMOVE" command also works with subflows that have
been created via the "SUB_CREATE" command instead of restricting to
the addresses that have been announced via the "ANNOUNCE" command.

Fixes: d9a4594eda ("mptcp: netlink: Add MPTCP_PM_CMD_REMOVE")
Link: https://github.com/multipath-tcp/mptcp_net-next/issues/379
Cc: stable@vger.kernel.org
Reviewed-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Signed-off-by: Geliang Tang <geliang.tang@suse.com>
Signed-off-by: Mat Martineau <martineau@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Geliang Tang 2023-06-04 20:25:19 -07:00 committed by David S. Miller
parent 48d73f609d
commit 24430f8bf5
1 changed files with 41 additions and 0 deletions
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41
net/mptcp/pm_userspace.c
View File

@ -79,6 +79,30 @@ append_err:
return ret;
}
/* If the subflow is closed from the other peer (not via a
* subflow destroy command then), we want to keep the entry
* not to assign the same ID to another address and to be
* able to send RM_ADDR after the removal of the subflow.
*/
static int mptcp_userspace_pm_delete_local_addr(struct mptcp_sock *msk,
struct mptcp_pm_addr_entry *addr)
{
struct mptcp_pm_addr_entry *entry, *tmp;
list_for_each_entry_safe(entry, tmp, &msk->pm.userspace_pm_local_addr_list, list) {
if (mptcp_addresses_equal(&entry->addr, &addr->addr, false)) {
/* TODO: a refcount is needed because the entry can
* be used multiple times (e.g. fullmesh mode).
*/
list_del_rcu(&entry->list);
kfree(entry);
return 0;
}
}
return -EINVAL;
}
int mptcp_userspace_pm_get_flags_and_ifindex_by_id(struct mptcp_sock *msk,
unsigned int id,
u8 *flags, int *ifindex)
@ -251,6 +275,7 @@ int mptcp_nl_cmd_sf_create(struct sk_buff *skb, struct genl_info *info)
struct nlattr *raddr = info->attrs[MPTCP_PM_ATTR_ADDR_REMOTE];
struct nlattr *token = info->attrs[MPTCP_PM_ATTR_TOKEN];
struct nlattr *laddr = info->attrs[MPTCP_PM_ATTR_ADDR];
struct mptcp_pm_addr_entry local = { 0 };
struct mptcp_addr_info addr_r;
struct mptcp_addr_info addr_l;
struct mptcp_sock *msk;
@ -302,12 +327,24 @@ int mptcp_nl_cmd_sf_create(struct sk_buff *skb, struct genl_info *info)
goto create_err;
}
local.addr = addr_l;
err = mptcp_userspace_pm_append_new_local_addr(msk, &local);
if (err < 0) {
GENL_SET_ERR_MSG(info, "did not match address and id");
goto create_err;
}
lock_sock(sk);
err = __mptcp_subflow_connect(sk, &addr_l, &addr_r);
release_sock(sk);
spin_lock_bh(&msk->pm.lock);
if (err)
mptcp_userspace_pm_delete_local_addr(msk, &local);
spin_unlock_bh(&msk->pm.lock);
create_err:
sock_put((struct sock *)msk);
return err;
@ -420,7 +457,11 @@ int mptcp_nl_cmd_sf_destroy(struct sk_buff *skb, struct genl_info *info)
ssk = mptcp_nl_find_ssk(msk, &addr_l, &addr_r);
if (ssk) {
struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk);
struct mptcp_pm_addr_entry entry = { .addr = addr_l };
spin_lock_bh(&msk->pm.lock);
mptcp_userspace_pm_delete_local_addr(msk, &entry);
spin_unlock_bh(&msk->pm.lock);
mptcp_subflow_shutdown(sk, ssk, RCV_SHUTDOWN | SEND_SHUTDOWN);
mptcp_close_ssk(sk, ssk, subflow);
MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_RMSUBFLOW);