In mptcp_pm_nl_get_local_id, skc_local is the same as msk_local, so it always return 0. Thus every subflow's local_id is 0. It's incorrect.
This patch fixed this issue. Also, we need to ignore the zero address here, like 0.0.0.0 in IPv4. When we use the zero address as a local address, it means that we can use any one of the local addresses. The zero address is not a new address, we don't need to add it to PM, so this patch added a new function address_zero to check whether an address is the zero address, if it is, we ignore this address. Reviewed-by: Paolo Abeni <pab...@redhat.com> Signed-off-by: Geliang Tang <geliangt...@gmail.com> --- net/mptcp/pm_netlink.c | 18 +++++++++++++++++- 1 file changed, 17 insertions(+), 1 deletion(-) diff --git a/net/mptcp/pm_netlink.c b/net/mptcp/pm_netlink.c index 2c208d2e65cd..dc2c57860d2d 100644 --- a/net/mptcp/pm_netlink.c +++ b/net/mptcp/pm_netlink.c @@ -66,6 +66,19 @@ static bool addresses_equal(const struct mptcp_addr_info *a, return a->port == b->port; } +static bool address_zero(const struct mptcp_addr_info *addr) +{ + struct mptcp_addr_info zero; + + memset(&zero, 0, sizeof(zero)); + zero.family = addr->family; + + if (addresses_equal(addr, &zero, false)) + return true; + + return false; +} + static void local_address(const struct sock_common *skc, struct mptcp_addr_info *addr) { @@ -323,10 +336,13 @@ int mptcp_pm_nl_get_local_id(struct mptcp_sock *msk, struct sock_common *skc) * addr */ local_address((struct sock_common *)msk, &msk_local); - local_address((struct sock_common *)msk, &skc_local); + local_address((struct sock_common *)skc, &skc_local); if (addresses_equal(&msk_local, &skc_local, false)) return 0; + if (address_zero(&skc_local)) + return 0; + pernet = net_generic(sock_net((struct sock *)msk), pm_nl_pernet_id); rcu_read_lock(); -- 2.17.1