diff mbox series

[net,1/5] mptcp: only send RM_ADDR in nl_cmd_remove

Message ID 20230602-send-net-20230602-v1-1-fe011dfa859d@kernel.org (mailing list archive)
State Accepted
Commit 8b1c94da1e481090f24127b2c420b0c0b0421ce3
Delegated to: Netdev Maintainers
Headers show
Series mptcp: Fixes for address advertisement | expand

Checks

Context Check Description
netdev/series_format success Posting correctly formatted
netdev/tree_selection success Clearly marked for net
netdev/fixes_present success Fixes tag present in non-next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 13 this patch: 13
netdev/cc_maintainers success CCed 9 of 9 maintainers
netdev/build_clang success Errors and warnings before: 8 this patch: 8
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success Fixes tag looks correct
netdev/build_allmodconfig_warn success Errors and warnings before: 13 this patch: 13
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 39 lines checked
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0

Commit Message

Mat Martineau June 5, 2023, 3:25 a.m. UTC
From: Geliang Tang <geliang.tang@suse.com>

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 [1]
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>
---
 net/mptcp/pm_netlink.c   | 18 ++++++++++++++++++
 net/mptcp/pm_userspace.c |  2 +-
 net/mptcp/protocol.h     |  1 +
 3 files changed, 20 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/net/mptcp/pm_netlink.c b/net/mptcp/pm_netlink.c
index bc343dab5e3f..59f8f3124855 100644
--- a/net/mptcp/pm_netlink.c
+++ b/net/mptcp/pm_netlink.c
@@ -1558,6 +1558,24 @@  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 27a275805c06..6beadea8c67d 100644
--- a/net/mptcp/pm_userspace.c
+++ b/net/mptcp/pm_userspace.c
@@ -232,7 +232,7 @@  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 c5255258bfb3..70c957bc56a8 100644
--- a/net/mptcp/protocol.h
+++ b/net/mptcp/protocol.h
@@ -832,6 +832,7 @@  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);