subject:"Re\: \[PATCH 3\/3\] net\/colo\-compare\: Add handler for passthrough connection"

Re: [PATCH 3/3] net/colo-compare: Add handler for passthrough connection

2021-01-15 Thread Lukas Straub

On Fri, 15 Jan 2021 09:07:47 +
"Zhang, Chen"  wrote:

> > -Original Message-
> > From: Lukas Straub 
> > Sent: Thursday, January 14, 2021 9:45 PM
> > To: Zhang, Chen 
> > Cc: Jason Wang ; qemu-dev  > de...@nongnu.org>; Eric Blake ; Dr. David Alan  
> > Gilbert ; Markus Armbruster ;
> > Zhang Chen 
> > Subject: Re: [PATCH 3/3] net/colo-compare: Add handler for passthrough
> > connection
> > 
> > On Thu, 24 Dec 2020 09:09:18 +0800
> > Zhang Chen  wrote:
> >   
> > > From: Zhang Chen 
> > >
> > > Currently, we just use guest's TCP/UDP source port as the key to
> > > bypass certain network traffic.
> > >
> > > Signed-off-by: Zhang Chen 
> > > ---
> > >  net/colo-compare.c | 49
> > > ++
> > >  net/colo-compare.h |  2 ++
> > >  net/net.c  | 27 +
> > >  3 files changed, 78 insertions(+)
> > >
> > > diff --git a/net/colo-compare.c b/net/colo-compare.c index
> > > 337025b44f..11a32caa9b 100644
> > > --- a/net/colo-compare.c
> > > +++ b/net/colo-compare.c
> > > @@ -46,6 +46,9 @@ static QTAILQ_HEAD(, CompareState) net_compares =
> > > static NotifierList colo_compare_notifiers =
> > >  NOTIFIER_LIST_INITIALIZER(colo_compare_notifiers);
> > >
> > > +static QLIST_HEAD(, PassthroughEntry) passthroughlist =
> > > +QLIST_HEAD_INITIALIZER(passthroughlist);
> > > +  
> > 
> > Hi,
> > I think this should be per colo-compare instance e.g. inside 'struct
> > CompareState'.  
> 
> It looks QMP and HMP also need to add colo-compare object ID to control it.
> Do we need make this command more general?

Yes, it gives more flexibility. For example if the VM a "public" and a separate 
"management" network interface, passthrough can then be enabled just on the 
"management" interface.

Regards,
Lukas Straub

> Thanks
> Chen
> 
> >   
> > >  [...]


pgp8Kmy1e0Qfg.pgp
Description: OpenPGP digital signature

RE: [PATCH 3/3] net/colo-compare: Add handler for passthrough connection

2021-01-15 Thread Zhang, Chen




> -Original Message-
> From: Lukas Straub 
> Sent: Thursday, January 14, 2021 9:51 PM
> To: Zhang, Chen 
> Cc: Jason Wang ; qemu-dev  de...@nongnu.org>; Eric Blake ; Dr. David Alan
> Gilbert ; Markus Armbruster ;
> Zhang Chen 
> Subject: Re: [PATCH 3/3] net/colo-compare: Add handler for passthrough
> connection
> 
> On Thu, 24 Dec 2020 09:09:18 +0800
> Zhang Chen  wrote:
> 
> > From: Zhang Chen 
> >
> > Currently, we just use guest's TCP/UDP source port as the key to
> > bypass certain network traffic.
> >
> > Signed-off-by: Zhang Chen 
> > ---
> >  net/colo-compare.c | 49
> > ++
> >  net/colo-compare.h |  2 ++
> >  net/net.c  | 27 +
> >  3 files changed, 78 insertions(+)
> >
> > diff --git a/net/colo-compare.c b/net/colo-compare.c index
> > 337025b44f..11a32caa9b 100644
> > --- a/net/colo-compare.c
> > +++ b/net/colo-compare.c
> > @@ -46,6 +46,9 @@ static QTAILQ_HEAD(, CompareState) net_compares =
> > static NotifierList colo_compare_notifiers =
> >  NOTIFIER_LIST_INITIALIZER(colo_compare_notifiers);
> >
> > +static QLIST_HEAD(, PassthroughEntry) passthroughlist =
> > +QLIST_HEAD_INITIALIZER(passthroughlist);
> > +
> >  #define COMPARE_READ_LEN_MAX NET_BUFSIZE  #define
> MAX_QUEUE_SIZE 1024
> >
> > @@ -103,6 +106,12 @@ typedef struct SendEntry {
> >  uint8_t *buf;
> >  } SendEntry;
> >
> > +typedef struct PassthroughEntry {
> > +bool is_tcp;
> > +uint16_t port;
> > +QLIST_ENTRY(PassthroughEntry) node; } PassthroughEntry;
> > +
> >  struct CompareState {
> >  Object parent;
> >
> > @@ -247,6 +256,7 @@ static int packet_enqueue(CompareState *s, int
> mode, Connection **con)
> >  ConnectionKey key;
> >  Packet *pkt = NULL;
> >  Connection *conn;
> > +PassthroughEntry *bypass, *next;
> >  int ret;
> >
> >  if (mode == PRIMARY_IN) {
> > @@ -264,8 +274,23 @@ static int packet_enqueue(CompareState *s, int
> mode, Connection **con)
> >  pkt = NULL;
> >  return -1;
> >  }
> > +
> >  fill_connection_key(pkt, &key);
> >
> > +/* Check COLO passthrough connenction */
> > +if (!QLIST_EMPTY(&passthroughlist)) {
> > +QLIST_FOREACH_SAFE(bypass, &passthroughlist, node, next) {
> > +if (((key.ip_proto == IPPROTO_TCP) && bypass->is_tcp) ||
> > +((key.ip_proto == IPPROTO_UDP) && !bypass->is_tcp)) {
> > +if (bypass->port == key.src_port) {
> > +packet_destroy(pkt, NULL);
> > +pkt = NULL;
> > +return -1;
> > +}
> > +}
> > +}
> > +}
> > +
> >  conn = connection_get(s->connection_track_table,
> >&key,
> >&s->conn_list); @@ -1373,6 +1398,30 @@
> > static void colo_flush_packets(void *opaque, void *user_data)
> >  }
> >  }
> >
> > +void colo_compare_passthrough_add(bool is_tcp, const uint16_t port) {
> > +PassthroughEntry *bypass = NULL;
> > +
> > +bypass = g_new0(PassthroughEntry, 1);
> > +bypass->is_tcp = is_tcp;
> > +bypass->port = port;
> > +QLIST_INSERT_HEAD(&passthroughlist, bypass, node); }
> > +
> > +void colo_compare_passthrough_del(bool is_tcp, const uint16_t port) {
> > +PassthroughEntry *bypass = NULL, *next = NULL;
> > +
> > +if (!QLIST_EMPTY(&passthroughlist)) {
> > +QLIST_FOREACH_SAFE(bypass, &passthroughlist, node, next) {
> > +if ((bypass->is_tcp == is_tcp) && (bypass->port == port)) {
> > +QLIST_REMOVE(bypass, node);
> > +g_free(bypass);
> > +}
> > +}
> > +}
> > +}
> > +
> 
> Access to "passtroughlist" needs to be protected by a lock, as
> "packet_enqueue" is called from a different iothread.

OK, I will add the lock in next version.

Thanks
Chen

> 
> >  static void colo_compare_class_init(ObjectClass *oc, void *data)  {
> >  UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc); diff --git
> > a/net/colo-compare.h b/net/colo-compare.h index
> 22ddd512e2..1fa026c85e
> > 100644
> > --- a/net/colo-compare.h
> > +++ b/net/colo-compare.h
> > @@ -20,5 +20,7 @@
&

RE: [PATCH 3/3] net/colo-compare: Add handler for passthrough connection

2021-01-15 Thread Zhang, Chen




> -Original Message-
> From: Lukas Straub 
> Sent: Thursday, January 14, 2021 9:45 PM
> To: Zhang, Chen 
> Cc: Jason Wang ; qemu-dev  de...@nongnu.org>; Eric Blake ; Dr. David Alan
> Gilbert ; Markus Armbruster ;
> Zhang Chen 
> Subject: Re: [PATCH 3/3] net/colo-compare: Add handler for passthrough
> connection
> 
> On Thu, 24 Dec 2020 09:09:18 +0800
> Zhang Chen  wrote:
> 
> > From: Zhang Chen 
> >
> > Currently, we just use guest's TCP/UDP source port as the key to
> > bypass certain network traffic.
> >
> > Signed-off-by: Zhang Chen 
> > ---
> >  net/colo-compare.c | 49
> > ++
> >  net/colo-compare.h |  2 ++
> >  net/net.c  | 27 +
> >  3 files changed, 78 insertions(+)
> >
> > diff --git a/net/colo-compare.c b/net/colo-compare.c index
> > 337025b44f..11a32caa9b 100644
> > --- a/net/colo-compare.c
> > +++ b/net/colo-compare.c
> > @@ -46,6 +46,9 @@ static QTAILQ_HEAD(, CompareState) net_compares =
> > static NotifierList colo_compare_notifiers =
> >  NOTIFIER_LIST_INITIALIZER(colo_compare_notifiers);
> >
> > +static QLIST_HEAD(, PassthroughEntry) passthroughlist =
> > +QLIST_HEAD_INITIALIZER(passthroughlist);
> > +
> 
> Hi,
> I think this should be per colo-compare instance e.g. inside 'struct
> CompareState'.

It looks QMP and HMP also need to add colo-compare object ID to control it.
Do we need make this command more general?

Thanks
Chen

> 
> >  #define COMPARE_READ_LEN_MAX NET_BUFSIZE  #define
> MAX_QUEUE_SIZE 1024
> >
> > @@ -103,6 +106,12 @@ typedef struct SendEntry {
> >  uint8_t *buf;
> >  } SendEntry;
> >
> > +typedef struct PassthroughEntry {
> > +bool is_tcp;
> > +uint16_t port;
> > +QLIST_ENTRY(PassthroughEntry) node; } PassthroughEntry;
> > +
> >  struct CompareState {
> >  Object parent;
> >
> > @@ -247,6 +256,7 @@ static int packet_enqueue(CompareState *s, int
> mode, Connection **con)
> >  ConnectionKey key;
> >  Packet *pkt = NULL;
> >  Connection *conn;
> > +PassthroughEntry *bypass, *next;
> >  int ret;
> >
> >  if (mode == PRIMARY_IN) {
> > @@ -264,8 +274,23 @@ static int packet_enqueue(CompareState *s, int
> mode, Connection **con)
> >  pkt = NULL;
> >  return -1;
> >  }
> > +
> >  fill_connection_key(pkt, &key);
> >
> > +/* Check COLO passthrough connenction */
> > +if (!QLIST_EMPTY(&passthroughlist)) {
> > +QLIST_FOREACH_SAFE(bypass, &passthroughlist, node, next) {
> > +if (((key.ip_proto == IPPROTO_TCP) && bypass->is_tcp) ||
> > +((key.ip_proto == IPPROTO_UDP) && !bypass->is_tcp)) {
> > +if (bypass->port == key.src_port) {
> > +packet_destroy(pkt, NULL);
> > +pkt = NULL;
> > +return -1;
> > +}
> > +}
> > +}
> > +}
> > +
> >  conn = connection_get(s->connection_track_table,
> >&key,
> >&s->conn_list); @@ -1373,6 +1398,30 @@
> > static void colo_flush_packets(void *opaque, void *user_data)
> >  }
> >  }
> >
> > +void colo_compare_passthrough_add(bool is_tcp, const uint16_t port) {
> > +PassthroughEntry *bypass = NULL;
> > +
> > +bypass = g_new0(PassthroughEntry, 1);
> > +bypass->is_tcp = is_tcp;
> > +bypass->port = port;
> > +QLIST_INSERT_HEAD(&passthroughlist, bypass, node); }
> > +
> > +void colo_compare_passthrough_del(bool is_tcp, const uint16_t port) {
> > +PassthroughEntry *bypass = NULL, *next = NULL;
> > +
> > +if (!QLIST_EMPTY(&passthroughlist)) {
> > +QLIST_FOREACH_SAFE(bypass, &passthroughlist, node, next) {
> > +if ((bypass->is_tcp == is_tcp) && (bypass->port == port)) {
> > +QLIST_REMOVE(bypass, node);
> > +g_free(bypass);
> > +}
> > +}
> > +}
> > +}
> > +
> >  static void colo_compare_class_init(ObjectClass *oc, void *data)  {
> >  UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc); diff --git
> > a/net/colo-compare.h b/net/colo-compare.h index
> 22ddd512e2..1fa026c85e
> > 100644
> > --- a/net/colo-compare.h
> > +++ b/net/c

Re: [PATCH 3/3] net/colo-compare: Add handler for passthrough connection

2021-01-14 Thread Lukas Straub

On Thu, 24 Dec 2020 09:09:18 +0800
Zhang Chen  wrote:

> From: Zhang Chen 
> 
> Currently, we just use guest's TCP/UDP source port as the key
> to bypass certain network traffic.
> 
> Signed-off-by: Zhang Chen 
> ---
>  net/colo-compare.c | 49 ++
>  net/colo-compare.h |  2 ++
>  net/net.c  | 27 +
>  3 files changed, 78 insertions(+)
> 
> diff --git a/net/colo-compare.c b/net/colo-compare.c
> index 337025b44f..11a32caa9b 100644
> --- a/net/colo-compare.c
> +++ b/net/colo-compare.c
> @@ -46,6 +46,9 @@ static QTAILQ_HEAD(, CompareState) net_compares =
>  static NotifierList colo_compare_notifiers =
>  NOTIFIER_LIST_INITIALIZER(colo_compare_notifiers);
>  
> +static QLIST_HEAD(, PassthroughEntry) passthroughlist =
> +QLIST_HEAD_INITIALIZER(passthroughlist);
> +
>  #define COMPARE_READ_LEN_MAX NET_BUFSIZE
>  #define MAX_QUEUE_SIZE 1024
>  
> @@ -103,6 +106,12 @@ typedef struct SendEntry {
>  uint8_t *buf;
>  } SendEntry;
>  
> +typedef struct PassthroughEntry {
> +bool is_tcp;
> +uint16_t port;
> +QLIST_ENTRY(PassthroughEntry) node;
> +} PassthroughEntry;
> +
>  struct CompareState {
>  Object parent;
>  
> @@ -247,6 +256,7 @@ static int packet_enqueue(CompareState *s, int mode, 
> Connection **con)
>  ConnectionKey key;
>  Packet *pkt = NULL;
>  Connection *conn;
> +PassthroughEntry *bypass, *next;
>  int ret;
>  
>  if (mode == PRIMARY_IN) {
> @@ -264,8 +274,23 @@ static int packet_enqueue(CompareState *s, int mode, 
> Connection **con)
>  pkt = NULL;
>  return -1;
>  }
> +
>  fill_connection_key(pkt, &key);
>  
> +/* Check COLO passthrough connenction */
> +if (!QLIST_EMPTY(&passthroughlist)) {
> +QLIST_FOREACH_SAFE(bypass, &passthroughlist, node, next) {
> +if (((key.ip_proto == IPPROTO_TCP) && bypass->is_tcp) ||
> +((key.ip_proto == IPPROTO_UDP) && !bypass->is_tcp)) {
> +if (bypass->port == key.src_port) {
> +packet_destroy(pkt, NULL);
> +pkt = NULL;
> +return -1;
> +}
> +}
> +}
> +}
> +
>  conn = connection_get(s->connection_track_table,
>&key,
>&s->conn_list);
> @@ -1373,6 +1398,30 @@ static void colo_flush_packets(void *opaque, void 
> *user_data)
>  }
>  }
>  
> +void colo_compare_passthrough_add(bool is_tcp, const uint16_t port)
> +{
> +PassthroughEntry *bypass = NULL;
> +
> +bypass = g_new0(PassthroughEntry, 1);
> +bypass->is_tcp = is_tcp;
> +bypass->port = port;
> +QLIST_INSERT_HEAD(&passthroughlist, bypass, node);
> +}
> +
> +void colo_compare_passthrough_del(bool is_tcp, const uint16_t port)
> +{
> +PassthroughEntry *bypass = NULL, *next = NULL;
> +
> +if (!QLIST_EMPTY(&passthroughlist)) {
> +QLIST_FOREACH_SAFE(bypass, &passthroughlist, node, next) {
> +if ((bypass->is_tcp == is_tcp) && (bypass->port == port)) {
> +QLIST_REMOVE(bypass, node);
> +g_free(bypass);
> +}
> +}
> +}
> +}
> +

Access to "passtroughlist" needs to be protected by a lock, as "packet_enqueue" 
is called from a different iothread.

>  static void colo_compare_class_init(ObjectClass *oc, void *data)
>  {
>  UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc);
> diff --git a/net/colo-compare.h b/net/colo-compare.h
> index 22ddd512e2..1fa026c85e 100644
> --- a/net/colo-compare.h
> +++ b/net/colo-compare.h
> @@ -20,5 +20,7 @@
>  void colo_notify_compares_event(void *opaque, int event, Error **errp);
>  void colo_compare_register_notifier(Notifier *notify);
>  void colo_compare_unregister_notifier(Notifier *notify);
> +void colo_compare_passthrough_add(bool is_tcp, const uint16_t port);
> +void colo_compare_passthrough_del(bool is_tcp, const uint16_t port);
>  
>  #endif /* QEMU_COLO_COMPARE_H */
> diff --git a/net/net.c b/net/net.c
> index eac7a92618..1f303e8309 100644
> --- a/net/net.c
> +++ b/net/net.c
> @@ -55,6 +55,7 @@
>  #include "sysemu/sysemu.h"
>  #include "net/filter.h"
>  #include "qapi/string-output-visitor.h"
> +#include "net/colo-compare.h"
>  
>  /* Net bridge is currently not supported for W32. */
>  #if !defined(_WIN32)
> @@ -1155,12 +1156,38 @@ void qmp_colo_passthrough_add(const char *prot, const 
> uint32_t port,
>Error **errp)
>  {
>  /* Setup passthrough connection */
> +if (port > 65536) {
> +error_setg(errp, "COLO pass through get wrong port");
> +return;
> +}
> +
> +if (!strcmp(prot, "tcp") || !strcmp(prot, "TCP")) {
> +colo_compare_passthrough_add(true, (uint16_t)port);
> +} else if (!strcmp(prot, "udp") || !strcmp(prot, "UDP")) {
> +colo_compare_passthrough_add(false, (uint16_t)port);
> +} else {
> +error_setg(errp, "COLO pass through j

Re: [PATCH 3/3] net/colo-compare: Add handler for passthrough connection

2021-01-14 Thread Lukas Straub

On Thu, 24 Dec 2020 09:09:18 +0800
Zhang Chen  wrote:

> From: Zhang Chen 
> 
> Currently, we just use guest's TCP/UDP source port as the key
> to bypass certain network traffic.
> 
> Signed-off-by: Zhang Chen 
> ---
>  net/colo-compare.c | 49 ++
>  net/colo-compare.h |  2 ++
>  net/net.c  | 27 +
>  3 files changed, 78 insertions(+)
> 
> diff --git a/net/colo-compare.c b/net/colo-compare.c
> index 337025b44f..11a32caa9b 100644
> --- a/net/colo-compare.c
> +++ b/net/colo-compare.c
> @@ -46,6 +46,9 @@ static QTAILQ_HEAD(, CompareState) net_compares =
>  static NotifierList colo_compare_notifiers =
>  NOTIFIER_LIST_INITIALIZER(colo_compare_notifiers);
>  
> +static QLIST_HEAD(, PassthroughEntry) passthroughlist =
> +QLIST_HEAD_INITIALIZER(passthroughlist);
> +

Hi,
I think this should be per colo-compare instance e.g. inside 'struct 
CompareState'.

>  #define COMPARE_READ_LEN_MAX NET_BUFSIZE
>  #define MAX_QUEUE_SIZE 1024
>  
> @@ -103,6 +106,12 @@ typedef struct SendEntry {
>  uint8_t *buf;
>  } SendEntry;
>  
> +typedef struct PassthroughEntry {
> +bool is_tcp;
> +uint16_t port;
> +QLIST_ENTRY(PassthroughEntry) node;
> +} PassthroughEntry;
> +
>  struct CompareState {
>  Object parent;
>  
> @@ -247,6 +256,7 @@ static int packet_enqueue(CompareState *s, int mode, 
> Connection **con)
>  ConnectionKey key;
>  Packet *pkt = NULL;
>  Connection *conn;
> +PassthroughEntry *bypass, *next;
>  int ret;
>  
>  if (mode == PRIMARY_IN) {
> @@ -264,8 +274,23 @@ static int packet_enqueue(CompareState *s, int mode, 
> Connection **con)
>  pkt = NULL;
>  return -1;
>  }
> +
>  fill_connection_key(pkt, &key);
>  
> +/* Check COLO passthrough connenction */
> +if (!QLIST_EMPTY(&passthroughlist)) {
> +QLIST_FOREACH_SAFE(bypass, &passthroughlist, node, next) {
> +if (((key.ip_proto == IPPROTO_TCP) && bypass->is_tcp) ||
> +((key.ip_proto == IPPROTO_UDP) && !bypass->is_tcp)) {
> +if (bypass->port == key.src_port) {
> +packet_destroy(pkt, NULL);
> +pkt = NULL;
> +return -1;
> +}
> +}
> +}
> +}
> +
>  conn = connection_get(s->connection_track_table,
>&key,
>&s->conn_list);
> @@ -1373,6 +1398,30 @@ static void colo_flush_packets(void *opaque, void 
> *user_data)
>  }
>  }
>  
> +void colo_compare_passthrough_add(bool is_tcp, const uint16_t port)
> +{
> +PassthroughEntry *bypass = NULL;
> +
> +bypass = g_new0(PassthroughEntry, 1);
> +bypass->is_tcp = is_tcp;
> +bypass->port = port;
> +QLIST_INSERT_HEAD(&passthroughlist, bypass, node);
> +}
> +
> +void colo_compare_passthrough_del(bool is_tcp, const uint16_t port)
> +{
> +PassthroughEntry *bypass = NULL, *next = NULL;
> +
> +if (!QLIST_EMPTY(&passthroughlist)) {
> +QLIST_FOREACH_SAFE(bypass, &passthroughlist, node, next) {
> +if ((bypass->is_tcp == is_tcp) && (bypass->port == port)) {
> +QLIST_REMOVE(bypass, node);
> +g_free(bypass);
> +}
> +}
> +}
> +}
> +
>  static void colo_compare_class_init(ObjectClass *oc, void *data)
>  {
>  UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc);
> diff --git a/net/colo-compare.h b/net/colo-compare.h
> index 22ddd512e2..1fa026c85e 100644
> --- a/net/colo-compare.h
> +++ b/net/colo-compare.h
> @@ -20,5 +20,7 @@
>  void colo_notify_compares_event(void *opaque, int event, Error **errp);
>  void colo_compare_register_notifier(Notifier *notify);
>  void colo_compare_unregister_notifier(Notifier *notify);
> +void colo_compare_passthrough_add(bool is_tcp, const uint16_t port);
> +void colo_compare_passthrough_del(bool is_tcp, const uint16_t port);
>  
>  #endif /* QEMU_COLO_COMPARE_H */
> diff --git a/net/net.c b/net/net.c
> index eac7a92618..1f303e8309 100644
> --- a/net/net.c
> +++ b/net/net.c
> @@ -55,6 +55,7 @@
>  #include "sysemu/sysemu.h"
>  #include "net/filter.h"
>  #include "qapi/string-output-visitor.h"
> +#include "net/colo-compare.h"
>  
>  /* Net bridge is currently not supported for W32. */
>  #if !defined(_WIN32)
> @@ -1155,12 +1156,38 @@ void qmp_colo_passthrough_add(const char *prot, const 
> uint32_t port,
>Error **errp)
>  {
>  /* Setup passthrough connection */
> +if (port > 65536) {
> +error_setg(errp, "COLO pass through get wrong port");
> +return;
> +}
> +
> +if (!strcmp(prot, "tcp") || !strcmp(prot, "TCP")) {
> +colo_compare_passthrough_add(true, (uint16_t)port);
> +} else if (!strcmp(prot, "udp") || !strcmp(prot, "UDP")) {
> +colo_compare_passthrough_add(false, (uint16_t)port);
> +} else {
> +error_setg(errp, "COLO pass through just support tcp or udp 
> pro

Re: [PATCH 3/3] net/colo-compare: Add handler for passthrough connection

RE: [PATCH 3/3] net/colo-compare: Add handler for passthrough connection

RE: [PATCH 3/3] net/colo-compare: Add handler for passthrough connection

Re: [PATCH 3/3] net/colo-compare: Add handler for passthrough connection

Re: [PATCH 3/3] net/colo-compare: Add handler for passthrough connection

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