* [PATCH v2 1/2] wan/hdlc_x25: make lapb params configurable
@ 2020-01-14 14:02 Martin Schiller
2020-01-14 14:02 ` [PATCH v2 2/2] wan/hdlc_x25: fix skb handling Martin Schiller
2020-01-15 21:43 ` [PATCH v2 1/2] wan/hdlc_x25: make lapb params configurable David Miller
0 siblings, 2 replies; 4+ messages in thread
From: Martin Schiller @ 2020-01-14 14:02 UTC (permalink / raw)
To: kubakici, khc, davem; +Cc: linux-x25, netdev, linux-kernel, Martin Schiller
This enables you to configure mode (DTE/DCE), Modulo, Window, T1, T2, N2 via
sethdlc (which needs to be patched as well).
Signed-off-by: Martin Schiller <ms@dev.tdt.de>
---
drivers/net/wan/hdlc_x25.c | 78 ++++++++++++++++++++++++++++++++-
include/uapi/linux/hdlc/ioctl.h | 9 ++++
include/uapi/linux/if.h | 1 +
3 files changed, 86 insertions(+), 2 deletions(-)
diff --git a/drivers/net/wan/hdlc_x25.c b/drivers/net/wan/hdlc_x25.c
index 5643675ff724..0479a2bf42f7 100644
--- a/drivers/net/wan/hdlc_x25.c
+++ b/drivers/net/wan/hdlc_x25.c
@@ -21,8 +21,17 @@
#include <linux/skbuff.h>
#include <net/x25device.h>
+struct x25_state {
+ x25_hdlc_proto settings;
+};
+
static int x25_ioctl(struct net_device *dev, struct ifreq *ifr);
+static struct x25_state* state(hdlc_device *hdlc)
+{
+ return (struct x25_state *)hdlc->state;
+}
+
/* These functions are callbacks called by LAPB layer */
static void x25_connect_disconnect(struct net_device *dev, int reason, int code)
@@ -132,6 +141,8 @@ static netdev_tx_t x25_xmit(struct sk_buff *skb, struct net_device *dev)
static int x25_open(struct net_device *dev)
{
int result;
+ hdlc_device *hdlc = dev_to_hdlc(dev);
+ struct lapb_parms_struct params;
static const struct lapb_register_struct cb = {
.connect_confirmation = x25_connected,
.connect_indication = x25_connected,
@@ -144,6 +155,26 @@ static int x25_open(struct net_device *dev)
result = lapb_register(dev, &cb);
if (result != LAPB_OK)
return result;
+
+ result = lapb_getparms(dev, ¶ms);
+ if (result != LAPB_OK)
+ return result;
+
+ if (state(hdlc)->settings.dce)
+ params.mode = params.mode | LAPB_DCE;
+
+ if (state(hdlc)->settings.modulo == 128)
+ params.mode = params.mode | LAPB_EXTENDED;
+
+ params.window = state(hdlc)->settings.window;
+ params.t1 = state(hdlc)->settings.t1;
+ params.t2 = state(hdlc)->settings.t2;
+ params.n2 = state(hdlc)->settings.n2;
+
+ result = lapb_setparms(dev, ¶ms);
+ if (result != LAPB_OK)
+ return result;
+
return 0;
}
@@ -186,6 +217,9 @@ static struct hdlc_proto proto = {
static int x25_ioctl(struct net_device *dev, struct ifreq *ifr)
{
+ x25_hdlc_proto __user *x25_s = ifr->ifr_settings.ifs_ifsu.x25;
+ const size_t size = sizeof(x25_hdlc_proto);
+ x25_hdlc_proto new_settings;
hdlc_device *hdlc = dev_to_hdlc(dev);
int result;
@@ -194,7 +228,13 @@ static int x25_ioctl(struct net_device *dev, struct ifreq *ifr)
if (dev_to_hdlc(dev)->proto != &proto)
return -EINVAL;
ifr->ifr_settings.type = IF_PROTO_X25;
- return 0; /* return protocol only, no settable parameters */
+ if (ifr->ifr_settings.size < size) {
+ ifr->ifr_settings.size = size; /* data size wanted */
+ return -ENOBUFS;
+ }
+ if (copy_to_user(x25_s, &state(hdlc)->settings, size))
+ return -EFAULT;
+ return 0;
case IF_PROTO_X25:
if (!capable(CAP_NET_ADMIN))
@@ -203,12 +243,46 @@ static int x25_ioctl(struct net_device *dev, struct ifreq *ifr)
if (dev->flags & IFF_UP)
return -EBUSY;
+ /* backward compatibility */
+ if (ifr->ifr_settings.size = 0) {
+ new_settings.dce = 0;
+ new_settings.modulo = 8;
+ new_settings.window = 7;
+ new_settings.t1 = 3;
+ new_settings.t2 = 1;
+ new_settings.n2 = 10;
+ }
+ else {
+ if (copy_from_user(&new_settings, x25_s, size))
+ return -EFAULT;
+
+ if ((new_settings.dce != 0 &&
+ new_settings.dce != 1) ||
+ (new_settings.modulo != 8 &&
+ new_settings.modulo != 128) ||
+ new_settings.window < 1 ||
+ (new_settings.modulo == 8 &&
+ new_settings.window > 7) ||
+ (new_settings.modulo == 128 &&
+ new_settings.window > 127) ||
+ new_settings.t1 < 1 ||
+ new_settings.t1 > 255 ||
+ new_settings.t2 < 1 ||
+ new_settings.t2 > 255 ||
+ new_settings.n2 < 1 ||
+ new_settings.n2 > 255)
+ return -EINVAL;
+ }
+
result=hdlc->attach(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT);
if (result)
return result;
- if ((result = attach_hdlc_protocol(dev, &proto, 0)))
+ if ((result = attach_hdlc_protocol(dev, &proto,
+ sizeof(struct x25_state))))
return result;
+
+ memcpy(&state(hdlc)->settings, &new_settings, size);
dev->type = ARPHRD_X25;
call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, dev);
netif_dormant_off(dev);
diff --git a/include/uapi/linux/hdlc/ioctl.h b/include/uapi/linux/hdlc/ioctl.h
index 0fe4238e8246..b06341acab5e 100644
--- a/include/uapi/linux/hdlc/ioctl.h
+++ b/include/uapi/linux/hdlc/ioctl.h
@@ -79,6 +79,15 @@ typedef struct {
unsigned int timeout;
} cisco_proto;
+typedef struct {
+ unsigned short dce; /* 1 for DCE (network side) operation */
+ unsigned int modulo; /* modulo (8 = basic / 128 = extended) */
+ unsigned int window; /* frame window size */
+ unsigned int t1; /* timeout t1 */
+ unsigned int t2; /* timeout t2 */
+ unsigned int n2; /* frame retry counter */
+} x25_hdlc_proto;
+
/* PPP doesn't need any info now - supply length = 0 to ioctl */
#endif /* __ASSEMBLY__ */
diff --git a/include/uapi/linux/if.h b/include/uapi/linux/if.h
index 4bf33344aab1..be714cd8c826 100644
--- a/include/uapi/linux/if.h
+++ b/include/uapi/linux/if.h
@@ -213,6 +213,7 @@ struct if_settings {
fr_proto __user *fr;
fr_proto_pvc __user *fr_pvc;
fr_proto_pvc_info __user *fr_pvc_info;
+ x25_hdlc_proto __user *x25;
/* interface settings */
sync_serial_settings __user *sync;
--
2.20.1
^ permalink raw reply related [flat|nested] 4+ messages in thread
* [PATCH v2 2/2] wan/hdlc_x25: fix skb handling
2020-01-14 14:02 [PATCH v2 1/2] wan/hdlc_x25: make lapb params configurable Martin Schiller
@ 2020-01-14 14:02 ` Martin Schiller
2020-01-15 21:43 ` [PATCH v2 1/2] wan/hdlc_x25: make lapb params configurable David Miller
1 sibling, 0 replies; 4+ messages in thread
From: Martin Schiller @ 2020-01-14 14:02 UTC (permalink / raw)
To: kubakici, khc, davem; +Cc: linux-x25, netdev, linux-kernel, Martin Schiller
o call skb_reset_network_header() before hdlc->xmit()
o change skb proto to HDLC (0x0019) before hdlc->xmit()
o call dev_queue_xmit_nit() before hdlc->xmit()
This changes make it possible to trace (tcpdump) outgoing layer2
(ETH_P_HDLC) packets
Additionally call skb_reset_network_header() after each skb_push() /
skb_pull().
Signed-off-by: Martin Schiller <ms@dev.tdt.de>
---
drivers/net/wan/hdlc_x25.c | 13 +++++++++++--
1 file changed, 11 insertions(+), 2 deletions(-)
diff --git a/drivers/net/wan/hdlc_x25.c b/drivers/net/wan/hdlc_x25.c
index 0479a2bf42f7..9eaad151c27f 100644
--- a/drivers/net/wan/hdlc_x25.c
+++ b/drivers/net/wan/hdlc_x25.c
@@ -71,11 +71,12 @@ static int x25_data_indication(struct net_device *dev, struct sk_buff *skb)
{
unsigned char *ptr;
- skb_push(skb, 1);
-
if (skb_cow(skb, 1))
return NET_RX_DROP;
+ skb_push(skb, 1);
+ skb_reset_network_header(skb);
+
ptr = skb->data;
*ptr = X25_IFACE_DATA;
@@ -88,6 +89,13 @@ static int x25_data_indication(struct net_device *dev, struct sk_buff *skb)
static void x25_data_transmit(struct net_device *dev, struct sk_buff *skb)
{
hdlc_device *hdlc = dev_to_hdlc(dev);
+
+ skb_reset_network_header(skb);
+ skb->protocol = hdlc_type_trans(skb, dev);
+
+ if (dev_nit_active(dev))
+ dev_queue_xmit_nit(skb, dev);
+
hdlc->xmit(skb, dev); /* Ignore return value :-( */
}
@@ -102,6 +110,7 @@ static netdev_tx_t x25_xmit(struct sk_buff *skb, struct net_device *dev)
switch (skb->data[0]) {
case X25_IFACE_DATA: /* Data to be transmitted */
skb_pull(skb, 1);
+ skb_reset_network_header(skb);
if ((result = lapb_data_request(dev, skb)) != LAPB_OK)
dev_kfree_skb(skb);
return NETDEV_TX_OK;
--
2.20.1
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH v2 1/2] wan/hdlc_x25: make lapb params configurable
2020-01-14 14:02 [PATCH v2 1/2] wan/hdlc_x25: make lapb params configurable Martin Schiller
2020-01-14 14:02 ` [PATCH v2 2/2] wan/hdlc_x25: fix skb handling Martin Schiller
@ 2020-01-15 21:43 ` David Miller
2020-01-16 6:03 ` Martin Schiller
1 sibling, 1 reply; 4+ messages in thread
From: David Miller @ 2020-01-15 21:43 UTC (permalink / raw)
To: ms; +Cc: kubakici, khc, linux-x25, netdev, linux-kernel
From: Martin Schiller <ms@dev.tdt.de>
Date: Tue, 14 Jan 2020 15:02:22 +0100
> This enables you to configure mode (DTE/DCE), Modulo, Window, T1, T2, N2 via
> sethdlc (which needs to be patched as well).
>
> Signed-off-by: Martin Schiller <ms@dev.tdt.de>
I don't know how wise it is to add new ioctls to this old driver.
Also, none of these ioctls even have COMPAT handling so they will
never work from a 32-bit binary running on a 64-bit kernel for
example.
Also:
> +static struct x25_state* state(hdlc_device *hdlc)
It is always "type *func" never "type* func"
> static int x25_open(struct net_device *dev)
> {
> int result;
> + hdlc_device *hdlc = dev_to_hdlc(dev);
> + struct lapb_parms_struct params;
> static const struct lapb_register_struct cb = {
Please make this reverse christmas tree ordered.
> @@ -186,6 +217,9 @@ static struct hdlc_proto proto = {
>
> static int x25_ioctl(struct net_device *dev, struct ifreq *ifr)
> {
> + x25_hdlc_proto __user *x25_s = ifr->ifr_settings.ifs_ifsu.x25;
> + const size_t size = sizeof(x25_hdlc_proto);
> + x25_hdlc_proto new_settings;
> hdlc_device *hdlc = dev_to_hdlc(dev);
> int result;
Likewise.
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH v2 1/2] wan/hdlc_x25: make lapb params configurable
2020-01-15 21:43 ` [PATCH v2 1/2] wan/hdlc_x25: make lapb params configurable David Miller
@ 2020-01-16 6:03 ` Martin Schiller
0 siblings, 0 replies; 4+ messages in thread
From: Martin Schiller @ 2020-01-16 6:03 UTC (permalink / raw)
To: David Miller; +Cc: kubakici, khc, linux-x25, netdev, linux-kernel
On 2020-01-15 22:43, David Miller wrote:
> From: Martin Schiller <ms@dev.tdt.de>
> Date: Tue, 14 Jan 2020 15:02:22 +0100
>
>> This enables you to configure mode (DTE/DCE), Modulo, Window, T1, T2,
>> N2 via
>> sethdlc (which needs to be patched as well).
>>
>> Signed-off-by: Martin Schiller <ms@dev.tdt.de>
>
> I don't know how wise it is to add new ioctls to this old driver.
As an user of this framework I can tell you that you need to be able to
tune this parameters if it's used in an professional environment.
>
> Also, none of these ioctls even have COMPAT handling so they will
> never work from a 32-bit binary running on a 64-bit kernel for
> example.
How often does this constellation occur in reality? I really have no
idea. Our software is either 32-bit or 64-bit, not a mix.
>
> Also:
>
>> +static struct x25_state* state(hdlc_device *hdlc)
>
> It is always "type *func" never "type* func"
Ok. I will change that. I've copied that from hdlc_fr.c to keep the
same coding style. But you are right:
"Don't look back, always look forward." :)
>
>> static int x25_open(struct net_device *dev)
>> {
>> int result;
>> + hdlc_device *hdlc = dev_to_hdlc(dev);
>> + struct lapb_parms_struct params;
>> static const struct lapb_register_struct cb = {
>
> Please make this reverse christmas tree ordered.
OK, will do.
>
>> @@ -186,6 +217,9 @@ static struct hdlc_proto proto = {
>>
>> static int x25_ioctl(struct net_device *dev, struct ifreq *ifr)
>> {
>> + x25_hdlc_proto __user *x25_s = ifr->ifr_settings.ifs_ifsu.x25;
>> + const size_t size = sizeof(x25_hdlc_proto);
>> + x25_hdlc_proto new_settings;
>> hdlc_device *hdlc = dev_to_hdlc(dev);
>> int result;
>
> Likewise.
ditto.
^ permalink raw reply [flat|nested] 4+ messages in thread
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