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mptcp: send out ADD_ADDR with echo flag 

When the ADD_ADDR suboption has been received, we need to send out the same
ADD_ADDR suboption with echo-flag=1, and no HMAC.

Suggested-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Reviewed-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: Geliang Tang <geliangtang@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Geliang Tang 2020-09-24 08:29:50 +08:00 committed by David S. Miller
parent d0876b2284
commit 6a6c05a8b0
4 changed files with 32 additions and 23 deletions
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27
net/mptcp/options.c
View File

@ -242,7 +242,7 @@ static void mptcp_parse_option(const struct sk_buff *skb,
mp_opt->add_addr = 1;
mp_opt->port = 0;
mp_opt->addr_id = *ptr++;
pr_debug("ADD_ADDR: id=%d", mp_opt->addr_id);
pr_debug("ADD_ADDR: id=%d, echo=%d", mp_opt->addr_id, mp_opt->echo);
if (mp_opt->family == MPTCP_ADDR_IPVERSION_4) {
memcpy((u8 *)&mp_opt->addr.s_addr, (u8 *)ptr, 4);
ptr += 4;
@ -579,10 +579,11 @@ static bool mptcp_established_options_add_addr(struct sock *sk,
struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
struct mptcp_sock *msk = mptcp_sk(subflow->conn);
struct mptcp_addr_info saddr;
bool echo;
int len;
if (!mptcp_pm_should_add_signal(msk) ||
!(mptcp_pm_add_addr_signal(msk, remaining, &saddr)))
!(mptcp_pm_add_addr_signal(msk, remaining, &saddr, &echo)))
return false;
len = mptcp_add_addr_len(saddr.family);
@ -594,22 +595,26 @@ static bool mptcp_established_options_add_addr(struct sock *sk,
if (saddr.family == AF_INET) {
opts->suboptions |= OPTION_MPTCP_ADD_ADDR;
opts->addr = saddr.addr;
opts->ahmac = add_addr_generate_hmac(msk->local_key,
msk->remote_key,
opts->addr_id,
&opts->addr);
if (!echo) {
opts->ahmac = add_addr_generate_hmac(msk->local_key,
msk->remote_key,
opts->addr_id,
&opts->addr);
}
}
#if IS_ENABLED(CONFIG_MPTCP_IPV6)
else if (saddr.family == AF_INET6) {
opts->suboptions |= OPTION_MPTCP_ADD_ADDR6;
opts->addr6 = saddr.addr6;
opts->ahmac = add_addr6_generate_hmac(msk->local_key,
msk->remote_key,
opts->addr_id,
&opts->addr6);
if (!echo) {
opts->ahmac = add_addr6_generate_hmac(msk->local_key,
msk->remote_key,
opts->addr_id,
&opts->addr6);
}
}
#endif
pr_debug("addr_id=%d, ahmac=%llu", opts->addr_id, opts->ahmac);
pr_debug("addr_id=%d, ahmac=%llu, echo=%d", opts->addr_id, opts->ahmac, echo);
return true;
}

18
net/mptcp/pm.c
View File

@ -13,11 +13,13 @@
/* path manager command handlers */
int mptcp_pm_announce_addr(struct mptcp_sock *msk,
const struct mptcp_addr_info *addr)
const struct mptcp_addr_info *addr,
bool echo)
{
pr_debug("msk=%p, local_id=%d", msk, addr->id);
msk->pm.local = *addr;
WRITE_ONCE(msk->pm.add_addr_echo, echo);
WRITE_ONCE(msk->pm.add_addr_signal, true);
return 0;
}
@ -135,15 +137,11 @@ void mptcp_pm_add_addr_received(struct mptcp_sock *msk,
pr_debug("msk=%p remote_id=%d accept=%d", msk, addr->id,
READ_ONCE(pm->accept_addr));
/* avoid acquiring the lock if there is no room for fouther addresses */
if (!READ_ONCE(pm->accept_addr))
return;
spin_lock_bh(&pm->lock);
/* be sure there is something to signal re-checking under PM lock */
if (READ_ONCE(pm->accept_addr) &&
mptcp_pm_schedule_work(msk, MPTCP_PM_ADD_ADDR_RECEIVED))
if (!READ_ONCE(pm->accept_addr))
mptcp_pm_announce_addr(msk, addr, true);
else if (mptcp_pm_schedule_work(msk, MPTCP_PM_ADD_ADDR_RECEIVED))
pm->remote = *addr;
spin_unlock_bh(&pm->lock);
@ -164,7 +162,7 @@ void mptcp_pm_rm_addr_received(struct mptcp_sock *msk, u8 rm_id)
/* path manager helpers */
bool mptcp_pm_add_addr_signal(struct mptcp_sock *msk, unsigned int remaining,
struct mptcp_addr_info *saddr)
struct mptcp_addr_info *saddr, bool *echo)
{
int ret = false;
@ -178,6 +176,7 @@ bool mptcp_pm_add_addr_signal(struct mptcp_sock *msk, unsigned int remaining,
goto out_unlock;
*saddr = msk->pm.local;
*echo = READ_ONCE(msk->pm.add_addr_echo);
WRITE_ONCE(msk->pm.add_addr_signal, false);
ret = true;
@ -226,6 +225,7 @@ void mptcp_pm_data_init(struct mptcp_sock *msk)
WRITE_ONCE(msk->pm.rm_addr_signal, false);
WRITE_ONCE(msk->pm.accept_addr, false);
WRITE_ONCE(msk->pm.accept_subflow, false);
WRITE_ONCE(msk->pm.add_addr_echo, false);
msk->pm.status = 0;
spin_lock_init(&msk->pm.lock);

4
net/mptcp/pm_netlink.c
View File

@ -198,7 +198,7 @@ static void mptcp_pm_create_subflow_or_signal_addr(struct mptcp_sock *msk)
if (local) {
msk->pm.add_addr_signaled++;
mptcp_pm_announce_addr(msk, &local->addr);
mptcp_pm_announce_addr(msk, &local->addr, false);
} else {
/* pick failed, avoid fourther attempts later */
msk->pm.local_addr_used = msk->pm.add_addr_signal_max;
@ -266,6 +266,8 @@ void mptcp_pm_nl_add_addr_received(struct mptcp_sock *msk)
spin_unlock_bh(&msk->pm.lock);
__mptcp_subflow_connect((struct sock *)msk, &local, &remote);
spin_lock_bh(&msk->pm.lock);
mptcp_pm_announce_addr(msk, &remote, true);
}
void mptcp_pm_nl_rm_addr_received(struct mptcp_sock *msk)

6
net/mptcp/protocol.h
View File

@ -169,6 +169,7 @@ struct mptcp_pm_data {
bool work_pending;
bool accept_addr;
bool accept_subflow;
bool add_addr_echo;
u8 add_addr_signaled;
u8 add_addr_accepted;
u8 local_addr_used;
@ -442,7 +443,8 @@ void mptcp_pm_add_addr_received(struct mptcp_sock *msk,
void mptcp_pm_rm_addr_received(struct mptcp_sock *msk, u8 rm_id);
int mptcp_pm_announce_addr(struct mptcp_sock *msk,
const struct mptcp_addr_info *addr);
const struct mptcp_addr_info *addr,
bool echo);
int mptcp_pm_remove_addr(struct mptcp_sock *msk, u8 local_id);
int mptcp_pm_remove_subflow(struct mptcp_sock *msk, u8 remote_id);
@ -464,7 +466,7 @@ static inline unsigned int mptcp_add_addr_len(int family)
}
bool mptcp_pm_add_addr_signal(struct mptcp_sock *msk, unsigned int remaining,
struct mptcp_addr_info *saddr);
struct mptcp_addr_info *saddr, bool *echo);
bool mptcp_pm_rm_addr_signal(struct mptcp_sock *msk, unsigned int remaining,
u8 *rm_id);
int mptcp_pm_get_local_id(struct mptcp_sock *msk, struct sock_common *skc);