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mptcp: local addresses fullmesh

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In mptcp_pm_nl_add_addr_received(), fill a temporary allocate array of
all local address corresponding to the fullmesh endpoint. If such array
is empty, keep the current behavior.

Elsewhere loop on such array and create a subflow for each local address
towards the given remote address

Suggested-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Geliang Tang <geliangtang@xiaomi.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Geliang Tang 2021-08-17 15:07:24 -07:00 committed by David S. Miller
parent 2843ff6f36
commit 1a0d6136c5
1 changed files with 63 additions and 10 deletions
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73
net/mptcp/pm_netlink.c
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@ -534,13 +534,67 @@ static void mptcp_pm_nl_subflow_established(struct mptcp_sock *msk)
mptcp_pm_create_subflow_or_signal_addr(msk);
}
/* Fill all the local addresses into the array addrs[],
* and return the array size.
*/
static unsigned int fill_local_addresses_vec(struct mptcp_sock *msk,
struct mptcp_addr_info *addrs)
{
struct sock *sk = (struct sock *)msk;
struct mptcp_pm_addr_entry *entry;
struct mptcp_addr_info local;
struct pm_nl_pernet *pernet;
unsigned int subflows_max;
int i = 0;
pernet = net_generic(sock_net(sk), pm_nl_pernet_id);
subflows_max = mptcp_pm_get_subflows_max(msk);
rcu_read_lock();
__mptcp_flush_join_list(msk);
list_for_each_entry_rcu(entry, &pernet->local_addr_list, list) {
if (!(entry->flags & MPTCP_PM_ADDR_FLAG_FULLMESH))
continue;
if (entry->addr.family != sk->sk_family) {
#if IS_ENABLED(CONFIG_MPTCP_IPV6)
if ((entry->addr.family == AF_INET &&
!ipv6_addr_v4mapped(&sk->sk_v6_daddr)) ||
(sk->sk_family == AF_INET &&
!ipv6_addr_v4mapped(&entry->addr.addr6)))
#endif
continue;
}
if (msk->pm.subflows < subflows_max) {
msk->pm.subflows++;
addrs[i++] = entry->addr;
}
}
rcu_read_unlock();
/* If the array is empty, fill in the single
* 'IPADDRANY' local address
*/
if (!i) {
memset(&local, 0, sizeof(local));
local.family = msk->pm.remote.family;
msk->pm.subflows++;
addrs[i++] = local;
}
return i;
}
static void mptcp_pm_nl_add_addr_received(struct mptcp_sock *msk)
{
struct mptcp_addr_info addrs[MPTCP_PM_ADDR_MAX];
struct sock *sk = (struct sock *)msk;
unsigned int add_addr_accept_max;
struct mptcp_addr_info remote;
struct mptcp_addr_info local;
unsigned int subflows_max;
int i, nr;
add_addr_accept_max = mptcp_pm_get_add_addr_accept_max(msk);
subflows_max = mptcp_pm_get_subflows_max(msk);
@ -552,23 +606,22 @@ static void mptcp_pm_nl_add_addr_received(struct mptcp_sock *msk)
if (lookup_subflow_by_daddr(&msk->conn_list, &msk->pm.remote))
goto add_addr_echo;
msk->pm.add_addr_accepted++;
msk->pm.subflows++;
if (msk->pm.add_addr_accepted >= add_addr_accept_max ||
msk->pm.subflows >= subflows_max)
WRITE_ONCE(msk->pm.accept_addr, false);
/* connect to the specified remote address, using whatever
* local address the routing configuration will pick.
*/
remote = msk->pm.remote;
if (!remote.port)
remote.port = sk->sk_dport;
memset(&local, 0, sizeof(local));
local.family = remote.family;
nr = fill_local_addresses_vec(msk, addrs);
msk->pm.add_addr_accepted++;
if (msk->pm.add_addr_accepted >= add_addr_accept_max ||
msk->pm.subflows >= subflows_max)
WRITE_ONCE(msk->pm.accept_addr, false);
spin_unlock_bh(&msk->pm.lock);
__mptcp_subflow_connect(sk, &local, &remote);
for (i = 0; i < nr; i++)
__mptcp_subflow_connect(sk, &addrs[i], &remote);
spin_lock_bh(&msk->pm.lock);
add_addr_echo: