When ADD_ADDR announcements use the port associated with an
active subflow, this change ensures that a listening socket is bound
to the announced addr+port in the kernel for subsequently receiving
MP_JOINs. But if a listening socket for this address is already held
by the application then no action is taken.
A listening socket is created (when there isn't a listener)
just prior to the addr advertisement. If it is desired to not create
a listening socket in the kernel for an address, then this can be
requested by including the MPTCP_PM_ADDR_FLAG_NO_LISTEN flag
with the address.
When a listening socket is created, it is stored in
struct mptcp_pm_add_entry and released accordingly.
Closes: https://github.com/multipath-tcp/mptcp_net-next/issues/203
Signed-off-by: Kishen Maloor <kishen.maloor@intel.com>
---
v2: fixed formatting
v3: added new addr flag MPTCP_PM_ADDR_FLAG_NO_LISTEN to skip creating a
listening socket in the kernel during an ADD_ADDR request, use this flag
along the in-kernel PM flow for ADD_ADDR requests (Note: listening sockets
are always created for port-based endpoints as before), use the
lsk_list_find_or_create() helper
v4: call lsk_list_find() after a failed lsk_list_find_or_create()
for a chance to retrieve a recently created lsk by a simultaneous
call
---
include/uapi/linux/mptcp.h | 1 +
net/mptcp/pm_netlink.c | 46 ++++++++++++++++++++++++++++++++++++--
2 files changed, 45 insertions(+), 2 deletions(-)
diff --git a/include/uapi/linux/mptcp.h b/include/uapi/linux/mptcp.h
index f106a3941cdf..265cabc0d7aa 100644
--- a/include/uapi/linux/mptcp.h
+++ b/include/uapi/linux/mptcp.h
@@ -81,6 +81,7 @@ enum {
#define MPTCP_PM_ADDR_FLAG_SUBFLOW (1 << 1)
#define MPTCP_PM_ADDR_FLAG_BACKUP (1 << 2)
#define MPTCP_PM_ADDR_FLAG_FULLMESH (1 << 3)
+#define MPTCP_PM_ADDR_FLAG_NO_LISTEN (1 << 4)
enum {
MPTCP_PM_CMD_UNSPEC,
diff --git a/net/mptcp/pm_netlink.c b/net/mptcp/pm_netlink.c
index a4fb9acbba51..9b3d871d3712 100644
--- a/net/mptcp/pm_netlink.c
+++ b/net/mptcp/pm_netlink.c
@@ -43,6 +43,7 @@ struct mptcp_pm_add_entry {
struct mptcp_addr_info addr;
struct timer_list add_timer;
struct mptcp_sock *sock;
+ struct mptcp_local_lsk *lsk_ref;
u8 retrans_times;
};
@@ -469,7 +470,8 @@ mptcp_pm_del_add_timer(struct mptcp_sock *msk,
}
static bool mptcp_pm_alloc_anno_list(struct mptcp_sock *msk,
- struct mptcp_pm_addr_entry *entry)
+ struct mptcp_pm_addr_entry *entry,
+ struct mptcp_local_lsk *lsk_ref)
{
struct mptcp_pm_add_entry *add_entry = NULL;
struct sock *sk = (struct sock *)msk;
@@ -489,6 +491,10 @@ static bool mptcp_pm_alloc_anno_list(struct mptcp_sock *msk,
add_entry->addr = entry->addr;
add_entry->sock = msk;
add_entry->retrans_times = 0;
+ add_entry->lsk_ref = lsk_ref;
+
+ if (lsk_ref)
+ lsk_list_add_ref(lsk_ref);
timer_setup(&add_entry->add_timer, mptcp_pm_add_timer, 0);
sk_reset_timer(sk, &add_entry->add_timer,
@@ -501,8 +507,11 @@ void mptcp_pm_free_anno_list(struct mptcp_sock *msk)
{
struct mptcp_pm_add_entry *entry, *tmp;
struct sock *sk = (struct sock *)msk;
+ struct pm_nl_pernet *pernet;
LIST_HEAD(free_list);
+ pernet = net_generic(sock_net(sk), pm_nl_pernet_id);
+
pr_debug("msk=%p", msk);
spin_lock_bh(&msk->pm.lock);
@@ -511,6 +520,8 @@ void mptcp_pm_free_anno_list(struct mptcp_sock *msk)
list_for_each_entry_safe(entry, tmp, &free_list, list) {
sk_stop_timer_sync(sk, &entry->add_timer);
+ if (entry->lsk_ref)
+ lsk_list_release(pernet, entry->lsk_ref);
kfree(entry);
}
}
@@ -615,7 +626,9 @@ lookup_id_by_addr(struct pm_nl_pernet *pernet, const struct mptcp_addr_info *add
}
static void mptcp_pm_create_subflow_or_signal_addr(struct mptcp_sock *msk)
+ __must_hold(&msk->pm.lock)
{
+ struct mptcp_local_lsk *lsk_ref = NULL;
struct sock *sk = (struct sock *)msk;
struct mptcp_pm_addr_entry *local;
unsigned int add_addr_signal_max;
@@ -652,12 +665,34 @@ static void mptcp_pm_create_subflow_or_signal_addr(struct mptcp_sock *msk)
local = select_signal_address(pernet, msk);
if (local) {
- if (mptcp_pm_alloc_anno_list(msk, local)) {
+ if (!(local->flags & MPTCP_PM_ADDR_FLAG_NO_LISTEN) &&
+ !local->addr.port) {
+ local->addr.port =
+ ((struct inet_sock *)inet_sk
+ ((struct sock *)msk))->inet_sport;
+
+ spin_unlock_bh(&msk->pm.lock);
+
+ lsk_ref = lsk_list_find_or_create(sock_net(sk), pernet,
+ local, NULL);
+
+ spin_lock_bh(&msk->pm.lock);
+
+ if (!lsk_ref)
+ lsk_ref = lsk_list_find(pernet, &local->addr);
+
+ local->addr.port = 0;
+ }
+
+ if (mptcp_pm_alloc_anno_list(msk, local, lsk_ref)) {
__clear_bit(local->addr.id, msk->pm.id_avail_bitmap);
msk->pm.add_addr_signaled++;
mptcp_pm_announce_addr(msk, &local->addr, false);
mptcp_pm_nl_addr_send_ack(msk);
}
+
+ if (lsk_ref)
+ lsk_list_release(pernet, lsk_ref);
}
}
@@ -749,6 +784,7 @@ static unsigned int fill_local_addresses_vec(struct mptcp_sock *msk,
}
static void mptcp_pm_nl_add_addr_received(struct mptcp_sock *msk)
+ __must_hold(&msk->pm.lock)
{
struct mptcp_addr_info addrs[MPTCP_PM_ADDR_MAX];
struct sock *sk = (struct sock *)msk;
@@ -1389,11 +1425,17 @@ int mptcp_pm_get_flags_and_ifindex_by_id(struct net *net, unsigned int id,
static bool remove_anno_list_by_saddr(struct mptcp_sock *msk,
struct mptcp_addr_info *addr)
{
+ struct sock *sk = (struct sock *)msk;
struct mptcp_pm_add_entry *entry;
+ struct pm_nl_pernet *pernet;
+
+ pernet = net_generic(sock_net(sk), pm_nl_pernet_id);
entry = mptcp_pm_del_add_timer(msk, addr, false);
if (entry) {
list_del(&entry->list);
+ if (entry->lsk_ref)
+ lsk_list_release(pernet, entry->lsk_ref);
kfree(entry);
return true;
}
--
2.31.1
Kishen Maloor <kishen.maloor@intel.com> 于2022年2月3日周四 15:25写道：
>
> When ADD_ADDR announcements use the port associated with an
> active subflow, this change ensures that a listening socket is bound
> to the announced addr+port in the kernel for subsequently receiving
> MP_JOINs. But if a listening socket for this address is already held
> by the application then no action is taken.
>
> A listening socket is created (when there isn't a listener)
> just prior to the addr advertisement. If it is desired to not create
> a listening socket in the kernel for an address, then this can be
> requested by including the MPTCP_PM_ADDR_FLAG_NO_LISTEN flag
> with the address.
>
> When a listening socket is created, it is stored in
> struct mptcp_pm_add_entry and released accordingly.
>
> Closes: https://github.com/multipath-tcp/mptcp_net-next/issues/203
> Signed-off-by: Kishen Maloor <kishen.maloor@intel.com>
> ---
> v2: fixed formatting
> v3: added new addr flag MPTCP_PM_ADDR_FLAG_NO_LISTEN to skip creating a
> listening socket in the kernel during an ADD_ADDR request, use this flag
> along the in-kernel PM flow for ADD_ADDR requests (Note: listening sockets
> are always created for port-based endpoints as before), use the
> lsk_list_find_or_create() helper
> v4: call lsk_list_find() after a failed lsk_list_find_or_create()
> for a chance to retrieve a recently created lsk by a simultaneous
> call
> ---
> include/uapi/linux/mptcp.h | 1 +
> net/mptcp/pm_netlink.c | 46 ++++++++++++++++++++++++++++++++++++--
> 2 files changed, 45 insertions(+), 2 deletions(-)
>
> diff --git a/include/uapi/linux/mptcp.h b/include/uapi/linux/mptcp.h
> index f106a3941cdf..265cabc0d7aa 100644
> --- a/include/uapi/linux/mptcp.h
> +++ b/include/uapi/linux/mptcp.h
> @@ -81,6 +81,7 @@ enum {
> #define MPTCP_PM_ADDR_FLAG_SUBFLOW (1 << 1)
> #define MPTCP_PM_ADDR_FLAG_BACKUP (1 << 2)
> #define MPTCP_PM_ADDR_FLAG_FULLMESH (1 << 3)
> +#define MPTCP_PM_ADDR_FLAG_NO_LISTEN (1 << 4)
>
> enum {
> MPTCP_PM_CMD_UNSPEC,
> diff --git a/net/mptcp/pm_netlink.c b/net/mptcp/pm_netlink.c
> index a4fb9acbba51..9b3d871d3712 100644
> --- a/net/mptcp/pm_netlink.c
> +++ b/net/mptcp/pm_netlink.c
> @@ -43,6 +43,7 @@ struct mptcp_pm_add_entry {
> struct mptcp_addr_info addr;
> struct timer_list add_timer;
> struct mptcp_sock *sock;
> + struct mptcp_local_lsk *lsk_ref;
> u8 retrans_times;
> };
>
> @@ -469,7 +470,8 @@ mptcp_pm_del_add_timer(struct mptcp_sock *msk,
> }
>
> static bool mptcp_pm_alloc_anno_list(struct mptcp_sock *msk,
> - struct mptcp_pm_addr_entry *entry)
> + struct mptcp_pm_addr_entry *entry,
> + struct mptcp_local_lsk *lsk_ref)
> {
> struct mptcp_pm_add_entry *add_entry = NULL;
> struct sock *sk = (struct sock *)msk;
> @@ -489,6 +491,10 @@ static bool mptcp_pm_alloc_anno_list(struct mptcp_sock *msk,
> add_entry->addr = entry->addr;
> add_entry->sock = msk;
> add_entry->retrans_times = 0;
> + add_entry->lsk_ref = lsk_ref;
> +
> + if (lsk_ref)
> + lsk_list_add_ref(lsk_ref);
>
> timer_setup(&add_entry->add_timer, mptcp_pm_add_timer, 0);
> sk_reset_timer(sk, &add_entry->add_timer,
> @@ -501,8 +507,11 @@ void mptcp_pm_free_anno_list(struct mptcp_sock *msk)
> {
> struct mptcp_pm_add_entry *entry, *tmp;
> struct sock *sk = (struct sock *)msk;
> + struct pm_nl_pernet *pernet;
> LIST_HEAD(free_list);
>
> + pernet = net_generic(sock_net(sk), pm_nl_pernet_id);
> +
> pr_debug("msk=%p", msk);
>
> spin_lock_bh(&msk->pm.lock);
> @@ -511,6 +520,8 @@ void mptcp_pm_free_anno_list(struct mptcp_sock *msk)
>
> list_for_each_entry_safe(entry, tmp, &free_list, list) {
> sk_stop_timer_sync(sk, &entry->add_timer);
> + if (entry->lsk_ref)
> + lsk_list_release(pernet, entry->lsk_ref);
> kfree(entry);
> }
> }
> @@ -615,7 +626,9 @@ lookup_id_by_addr(struct pm_nl_pernet *pernet, const struct mptcp_addr_info *add
> }
>
> static void mptcp_pm_create_subflow_or_signal_addr(struct mptcp_sock *msk)
> + __must_hold(&msk->pm.lock)
> {
> + struct mptcp_local_lsk *lsk_ref = NULL;
> struct sock *sk = (struct sock *)msk;
> struct mptcp_pm_addr_entry *local;
> unsigned int add_addr_signal_max;
> @@ -652,12 +665,34 @@ static void mptcp_pm_create_subflow_or_signal_addr(struct mptcp_sock *msk)
> local = select_signal_address(pernet, msk);
>
> if (local) {
> - if (mptcp_pm_alloc_anno_list(msk, local)) {
> + if (!(local->flags & MPTCP_PM_ADDR_FLAG_NO_LISTEN) &&
> + !local->addr.port) {
> + local->addr.port =
> + ((struct inet_sock *)inet_sk
> + ((struct sock *)msk))->inet_sport;
How about putting them in one line:
local->addr.port = ((struct inet_sock *)inet_sk(sk))->inet_sport;
> +
> + spin_unlock_bh(&msk->pm.lock);
> +
> + lsk_ref = lsk_list_find_or_create(sock_net(sk), pernet,
> + local, NULL);
> +
> + spin_lock_bh(&msk->pm.lock);
> +
> + if (!lsk_ref)
> + lsk_ref = lsk_list_find(pernet, &local->addr);
> +
> + local->addr.port = 0;
> + }
> +
> + if (mptcp_pm_alloc_anno_list(msk, local, lsk_ref)) {
> __clear_bit(local->addr.id, msk->pm.id_avail_bitmap);
> msk->pm.add_addr_signaled++;
> mptcp_pm_announce_addr(msk, &local->addr, false);
> mptcp_pm_nl_addr_send_ack(msk);
> }
> +
> + if (lsk_ref)
> + lsk_list_release(pernet, lsk_ref);
> }
> }
>
> @@ -749,6 +784,7 @@ static unsigned int fill_local_addresses_vec(struct mptcp_sock *msk,
> }
>
> static void mptcp_pm_nl_add_addr_received(struct mptcp_sock *msk)
> + __must_hold(&msk->pm.lock)
> {
> struct mptcp_addr_info addrs[MPTCP_PM_ADDR_MAX];
> struct sock *sk = (struct sock *)msk;
> @@ -1389,11 +1425,17 @@ int mptcp_pm_get_flags_and_ifindex_by_id(struct net *net, unsigned int id,
> static bool remove_anno_list_by_saddr(struct mptcp_sock *msk,
> struct mptcp_addr_info *addr)
> {
> + struct sock *sk = (struct sock *)msk;
> struct mptcp_pm_add_entry *entry;
> + struct pm_nl_pernet *pernet;
> +
> + pernet = net_generic(sock_net(sk), pm_nl_pernet_id);
>
> entry = mptcp_pm_del_add_timer(msk, addr, false);
> if (entry) {
> list_del(&entry->list);
> + if (entry->lsk_ref)
> + lsk_list_release(pernet, entry->lsk_ref);
> kfree(entry);
> return true;
> }
> --
> 2.31.1
>
>
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