mptcp: only send RM_ADDR in nl_cmd_remove

commit 8b1c94da1e481090f24127b2c420b0c0b0421ce3 upstream.

The specifications from [1] about the "REMOVE" command say:

    Announce that an address has been lost to the peer

It was then only supposed to send a RM_ADDR and not trying to delete
associated subflows.

A new helper mptcp_pm_remove_addrs() is then introduced to do just
that, compared to mptcp_pm_remove_addrs_and_subflows() also removing
subflows.

To delete a subflow, the userspace daemon can use the "SUB_DESTROY"
command, see mptcp_nl_cmd_sf_destroy().

Fixes: d9a4594edabf ("mptcp: netlink: Add MPTCP_PM_CMD_REMOVE")
Link: https://github.com/multipath-tcp/mptcp/blob/mptcp_v0.96/include/uapi/linux/mptcp.h
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/mptcp/pm_netlink.c b/net/mptcp/pm_netlink.c
index 1c69e47..01d34ee 100644 (file)
--- a/net/mptcp/pm_netlink.c
+++ b/net/mptcp/pm_netlink.c
@@ -1550,6 +1550,24 @@ static int mptcp_nl_cmd_del_addr(struct sk_buff *skb, struct genl_info *info)
        return ret;
 }
 
+void mptcp_pm_remove_addrs(struct mptcp_sock *msk, struct list_head *rm_list)
+{
+       struct mptcp_rm_list alist = { .nr = 0 };
+       struct mptcp_pm_addr_entry *entry;
+
+       list_for_each_entry(entry, rm_list, list) {
+               remove_anno_list_by_saddr(msk, &entry->addr);
+               if (alist.nr < MPTCP_RM_IDS_MAX)
+                       alist.ids[alist.nr++] = entry->addr.id;
+       }
+
+       if (alist.nr) {
+               spin_lock_bh(&msk->pm.lock);
+               mptcp_pm_remove_addr(msk, &alist);
+               spin_unlock_bh(&msk->pm.lock);
+       }
+}
+
 void mptcp_pm_remove_addrs_and_subflows(struct mptcp_sock *msk,
                                        struct list_head *rm_list)
 {

diff --git a/net/mptcp/pm_userspace.c b/net/mptcp/pm_userspace.c
index c1d6cd5..a0c1e32 100644 (file)
--- a/net/mptcp/pm_userspace.c
+++ b/net/mptcp/pm_userspace.c
@@ -231,7 +231,7 @@ int mptcp_nl_cmd_remove(struct sk_buff *skb, struct genl_info *info)
 
        list_move(&match->list, &free_list);
 
-       mptcp_pm_remove_addrs_and_subflows(msk, &free_list);
+       mptcp_pm_remove_addrs(msk, &free_list);
 
        release_sock((struct sock *)msk);
 

diff --git a/net/mptcp/protocol.h b/net/mptcp/protocol.h
index 55fc5e4..fc00dd5 100644 (file)
--- a/net/mptcp/protocol.h
+++ b/net/mptcp/protocol.h
@@ -820,6 +820,7 @@ int mptcp_pm_announce_addr(struct mptcp_sock *msk,
                           bool echo);
 int mptcp_pm_remove_addr(struct mptcp_sock *msk, const struct mptcp_rm_list *rm_list);
 int mptcp_pm_remove_subflow(struct mptcp_sock *msk, const struct mptcp_rm_list *rm_list);
+void mptcp_pm_remove_addrs(struct mptcp_sock *msk, struct list_head *rm_list);
 void mptcp_pm_remove_addrs_and_subflows(struct mptcp_sock *msk,
                                        struct list_head *rm_list);