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mptcp: add deny_join_id0 in mptcp_options_received

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This patch added a new flag named deny_join_id0 in struct
mptcp_options_received. Set it when MP_CAPABLE with the flag
MPTCP_CAP_DENYJOIN_ID0 is received.

Also add a new flag remote_deny_join_id0 in struct mptcp_pm_data. When the
flag deny_join_id0 is set, set this remote_deny_join_id0 flag.

In mptcp_pm_create_subflow_or_signal_addr, if the remote_deny_join_id0 flag
is set, and the remote address id is zero, stop this connection.

Suggested-by: Florian Westphal <fw@strlen.de>
Acked-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Geliang Tang <geliangtang@gmail.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 2021-06-22 12:25:20 -07:00 committed by David S. Miller
parent bab6b88e05
commit df377be387
5 changed files with 15 additions and 2 deletions
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7
net/mptcp/options.c
View File

@ -83,6 +83,9 @@ static void mptcp_parse_option(const struct sk_buff *skb,
if (flags & MPTCP_CAP_CHECKSUM_REQD)
mp_opt->csum_reqd = 1;
if (flags & MPTCP_CAP_DENY_JOIN_ID0)
mp_opt->deny_join_id0 = 1;
mp_opt->mp_capable = 1;
if (opsize >= TCPOLEN_MPTCP_MPC_SYNACK) {
mp_opt->sndr_key = get_unaligned_be64(ptr);
@ -360,6 +363,7 @@ void mptcp_get_options(const struct sock *sk,
mp_opt->mp_prio = 0;
mp_opt->reset = 0;
mp_opt->csum_reqd = READ_ONCE(msk->csum_enabled);
mp_opt->deny_join_id0 = 0;
length = (th->doff * 4) - sizeof(struct tcphdr);
ptr = (const unsigned char *)(th + 1);
@ -908,6 +912,9 @@ static bool check_fully_established(struct mptcp_sock *msk, struct sock *ssk,
return false;
}
if (mp_opt->deny_join_id0)
WRITE_ONCE(msk->pm.remote_deny_join_id0, true);
if (unlikely(!READ_ONCE(msk->pm.server_side)))
pr_warn_once("bogus mpc option on established client sk");
mptcp_subflow_fully_established(subflow, mp_opt);

1
net/mptcp/pm.c
View File

@ -320,6 +320,7 @@ void mptcp_pm_data_init(struct mptcp_sock *msk)
WRITE_ONCE(msk->pm.addr_signal, 0);
WRITE_ONCE(msk->pm.accept_addr, false);
WRITE_ONCE(msk->pm.accept_subflow, false);
WRITE_ONCE(msk->pm.remote_deny_join_id0, false);
msk->pm.status = 0;
spin_lock_init(&msk->pm.lock);

3
net/mptcp/pm_netlink.c
View File

@ -451,7 +451,8 @@ static void mptcp_pm_create_subflow_or_signal_addr(struct mptcp_sock *msk)
/* check if should create a new subflow */
if (msk->pm.local_addr_used < local_addr_max &&
msk->pm.subflows < subflows_max) {
msk->pm.subflows < subflows_max &&
!READ_ONCE(msk->pm.remote_deny_join_id0)) {
local = select_local_address(pernet, msk);
if (local) {
struct mptcp_addr_info remote = { 0 };

4
net/mptcp/protocol.h
View File

@ -138,7 +138,8 @@ struct mptcp_options_received {
mp_prio : 1,
echo : 1,
csum_reqd : 1,
backup : 1;
backup : 1,
deny_join_id0 : 1;
u32 token;
u32 nonce;
u64 thmac;
@ -193,6 +194,7 @@ struct mptcp_pm_data {
bool work_pending;
bool accept_addr;
bool accept_subflow;
bool remote_deny_join_id0;
u8 add_addr_signaled;
u8 add_addr_accepted;
u8 local_addr_used;

2
net/mptcp/subflow.c
View File

@ -408,6 +408,8 @@ static void subflow_finish_connect(struct sock *sk, const struct sk_buff *skb)
if (mp_opt.csum_reqd)
WRITE_ONCE(mptcp_sk(parent)->csum_enabled, true);
if (mp_opt.deny_join_id0)
WRITE_ONCE(mptcp_sk(parent)->pm.remote_deny_join_id0, true);
subflow->mp_capable = 1;
subflow->can_ack = 1;
subflow->remote_key = mp_opt.sndr_key;