[PATCH net-next 3/6] mptcp: remove id 0 address
From: Mat Martineau <hidden>
Date: 2021-03-31 00:10:07
Also in:
mptcp
Subsystem:
networking [general], networking [mptcp], the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Matthieu Baerts, Mat Martineau, Linus Torvalds
From: Geliang Tang <redacted> This patch added a new function mptcp_nl_remove_id_zero_address to remove the id 0 address. In this function, traverse all the existing msk sockets to find the msk matched the input IP address. Then fill the removing list with id 0, and pass it to mptcp_pm_remove_addr and mptcp_pm_remove_subflow. Suggested-by: Paolo Abeni <pabeni@redhat.com> Suggested-by: Matthieu Baerts <redacted> Reviewed-by: Mat Martineau <redacted> Signed-off-by: Geliang Tang <redacted> --- net/mptcp/pm_netlink.c | 43 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 43 insertions(+)
diff --git a/net/mptcp/pm_netlink.c b/net/mptcp/pm_netlink.c
index e00397f2abf1..cadafafa1049 100644
--- a/net/mptcp/pm_netlink.c
+++ b/net/mptcp/pm_netlink.c@@ -1156,6 +1156,41 @@ static void mptcp_pm_free_addr_entry(struct mptcp_pm_addr_entry *entry) } } +static int mptcp_nl_remove_id_zero_address(struct net *net, + struct mptcp_addr_info *addr) +{ + struct mptcp_rm_list list = { .nr = 0 }; + long s_slot = 0, s_num = 0; + struct mptcp_sock *msk; + + list.ids[list.nr++] = 0; + + while ((msk = mptcp_token_iter_next(net, &s_slot, &s_num)) != NULL) { + struct sock *sk = (struct sock *)msk; + struct mptcp_addr_info msk_local; + + if (list_empty(&msk->conn_list)) + goto next; + + local_address((struct sock_common *)msk, &msk_local); + if (!addresses_equal(&msk_local, addr, addr->port)) + goto next; + + lock_sock(sk); + spin_lock_bh(&msk->pm.lock); + mptcp_pm_remove_addr(msk, &list); + mptcp_pm_nl_rm_subflow_received(msk, &list); + spin_unlock_bh(&msk->pm.lock); + release_sock(sk); + +next: + sock_put(sk); + cond_resched(); + } + + return 0; +} + static int mptcp_nl_cmd_del_addr(struct sk_buff *skb, struct genl_info *info) { struct nlattr *attr = info->attrs[MPTCP_PM_ATTR_ADDR];
@@ -1168,6 +1203,14 @@ static int mptcp_nl_cmd_del_addr(struct sk_buff *skb, struct genl_info *info) if (ret < 0) return ret; + /* the zero id address is special: the first address used by the msk + * always gets such an id, so different subflows can have different zero + * id addresses. Additionally zero id is not accounted for in id_bitmap. + * Let's use an 'mptcp_rm_list' instead of the common remove code. + */ + if (addr.addr.id == 0) + return mptcp_nl_remove_id_zero_address(sock_net(skb->sk), &addr.addr); + spin_lock_bh(&pernet->lock); entry = __lookup_addr_by_id(pernet, addr.addr.id); if (!entry) {
--
2.31.1