[net-next 0/3] 802.21 and MPLS headers and classification

[net-next 0/3] 802.21 and MPLS headers and classification

[Simon Wunderlich]

Hi,

this series contains a header file proposal for MPLS labels. These
labels do not seem to be properly defined in the kernel so far. We are
developing a wired/wireless 802.21/MPLS switch and need to check the
MPLS labels to use the traffic control info for transmissions over
802.11 networks.

Please let me know if I should send these patches to somewhere else - I
can certainly resend the 3rd patch to linux-wireless separately but
figured it would be better like this to keep the context.

Thanks,
     Simon

Simon Wunderlich (3):
  if_ether.h: add IEEE 802.21 Ethertype
  UAPI: add MPLS label stack definition
  cfg80211: add MPLS and 802.21 classification

 include/uapi/linux/if_ether.h |    1 +
 include/uapi/linux/mpls.h     |   34 ++++++++++++++++++++++++++++++++++
 net/wireless/util.c           |   24 ++++++++++++++++++++++++
 3 files changed, 59 insertions(+)
 create mode 100644 include/uapi/linux/mpls.h

-- 
1.7.10.4

[net-next 1/3] if_ether.h: add IEEE 802.21 Ethertype

[Simon Wunderlich]

Add the Ethertype for IEEE Std 802.21 - Media Independent Handover
Protocol. This Ethertype is used for network control messages.

Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
Signed-off-by: Mathias Kretschmer <mathias.kretschmer@fokus.fraunhofer.de>
---
 include/uapi/linux/if_ether.h |    1 +
 1 file changed, 1 insertion(+)

diff --git a/include/uapi/linux/if_ether.h b/include/uapi/linux/if_ether.h
index 2ce0f6a..2e27208 100644
--- a/include/uapi/linux/if_ether.h
+++ b/include/uapi/linux/if_ether.h
@@ -89,6 +89,7 @@
 #define ETH_P_FCOE	0x8906		/* Fibre Channel over Ethernet  */
 #define ETH_P_TDLS	0x890D          /* TDLS */
 #define ETH_P_FIP	0x8914		/* FCoE Initialization Protocol */
+#define ETH_P_80221	0x8917		/* IEEE 802.21 Media Independent Handover Protocol */
 #define ETH_P_QINQ1	0x9100		/* deprecated QinQ VLAN [ NOT AN OFFICIALLY REGISTERED ID ] */
 #define ETH_P_QINQ2	0x9200		/* deprecated QinQ VLAN [ NOT AN OFFICIALLY REGISTERED ID ] */
 #define ETH_P_QINQ3	0x9300		/* deprecated QinQ VLAN [ NOT AN OFFICIALLY REGISTERED ID ] */
-- 
1.7.10.4

[net-next 2/3] UAPI: add MPLS label stack definition

[Simon Wunderlich]

Labels for the Multiprotocol Label Switching are defined in RFC 3032
which was superseded by RFC 5462. Add the definition to UAPI.

Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
Signed-off-by: Mathias Kretschmer <mathias.kretschmer@fokus.fraunhofer.de>
---
 include/uapi/linux/mpls.h |   34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)
 create mode 100644 include/uapi/linux/mpls.h

diff --git a/include/uapi/linux/mpls.h b/include/uapi/linux/mpls.h
new file mode 100644
index 0000000..15c8260
--- /dev/null
+++ b/include/uapi/linux/mpls.h
@@ -0,0 +1,34 @@
+#ifndef _UAPI_MPLS_H
+#define _UAPI_MPLS_H
+
+#include <linux/types.h>
+#include <asm/byteorder.h>
+
+/* Reference: RFC 5462, RFC 3032
+ *
+ *  0                   1                   2                   3
+ *  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * |                Label                  | TC  |S|       TTL     |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *
+ *	Label:  Label Value, 20 bits
+ *	TC:     Traffic Class field, 3 bits
+ *	S:      Bottom of Stack, 1 bit
+ *	TTL:    Time to Live, 8 bits
+ */
+
+struct mpls_label_stack {
+	__be32 entry;
+};
+
+#define MPLS_LS_LABEL_MASK      0xFFFFF000
+#define MPLS_LS_LABEL_SHIFT     12
+#define MPLS_LS_TC_MASK         0x00000E00
+#define MPLS_LS_TC_SHIFT        9
+#define MPLS_LS_S_MASK          0x00000100
+#define MPLS_LS_S_SHIFT         8
+#define MPLS_LS_TTL_MASK        0x000000FF
+#define MPLS_LS_TTL_SHIFT       0
+
+#endif /* _UAPI_MPLS_H */
-- 
1.7.10.4

[net-next 3/3] cfg80211: add MPLS and 802.21 classification

[Simon Wunderlich]

MPLS labels may contain traffic control information, which should be
evaluated and used by the wireless subsystem if present.

Also check for IEEE 802.21 which is always network control traffic.

Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
Signed-off-by: Mathias Kretschmer <mathias.kretschmer@fokus.fraunhofer.de>
---
 net/wireless/util.c |   24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/net/wireless/util.c b/net/wireless/util.c
index d39c371..98e3b11 100644
--- a/net/wireless/util.c
+++ b/net/wireless/util.c
@@ -11,6 +11,7 @@
 #include <net/ip.h>
 #include <net/dsfield.h>
 #include <linux/if_vlan.h>
+#include <uapi/linux/mpls.h>
 #include "core.h"
 #include "rdev-ops.h"
 
@@ -710,6 +711,29 @@ unsigned int cfg80211_classify8021d(struct sk_buff *skb,
 			return vlan_priority;
 	}
 
+	if (skb_headlen(skb) >= sizeof(struct ethhdr)) {
+		struct ethhdr *eh = (struct ethhdr *) skb->data;
+		struct mpls_label_stack mpls_tmp, *mpls;
+
+		switch (eh->h_proto) {
+		case __constant_htons(ETH_P_MPLS_UC):
+		case __constant_htons(ETH_P_MPLS_MC):
+			/* MPLS */
+			mpls = skb_header_pointer(skb, sizeof(*eh),
+						  sizeof(*mpls), &mpls_tmp);
+			if (!mpls)
+				break;
+
+			return (ntohl(mpls->entry) & MPLS_LS_TC_MASK)
+				>> MPLS_LS_TC_SHIFT;
+		case __constant_htons(ETH_P_80221):
+			/* 802.21 is always network control traffic */
+			return 7;
+		default:
+			break;
+		}
+	}
+
 	switch (skb->protocol) {
 	case htons(ETH_P_IP):
 		dscp = ipv4_get_dsfield(ip_hdr(skb)) & 0xfc;
-- 
1.7.10.4

Re: [net-next 3/3] cfg80211: add MPLS and 802.21 classification

[Joe Perches]

On Wed, 2014-02-12 at 11:53 +0100, Simon Wunderlich wrote:
> MPLS labels may contain traffic control information, which should be
> evaluated and used by the wireless subsystem if present.

trivial notes:

> diff --git a/net/wireless/util.c b/net/wireless/util.c
[]
> @@ -11,6 +11,7 @@
>  #include <net/ip.h>
>  #include <net/dsfield.h>
>  #include <linux/if_vlan.h>
> +#include <uapi/linux/mpls.h>

Please try not to #include uapi files.

> @@ -710,6 +711,29 @@ unsigned int cfg80211_classify8021d(struct sk_buff *skb,
>  			return vlan_priority;
>  	}
>  
> +	if (skb_headlen(skb) >= sizeof(struct ethhdr)) {
> +		struct ethhdr *eh = (struct ethhdr *) skb->data;
> +		struct mpls_label_stack mpls_tmp, *mpls;
> +
> +		switch (eh->h_proto) {
> +		case __constant_htons(ETH_P_MPLS_UC):
> +		case __constant_htons(ETH_P_MPLS_MC):

__constant_ isn't necessary for these labels.

>  	switch (skb->protocol) {
>  	case htons(ETH_P_IP):
>  		dscp = ipv4_get_dsfield(ip_hdr(skb)) & 0xfc;

like this, just case htons(ETH_<FOO>) is enough.

Re: [net-next 3/3] cfg80211: add MPLS and 802.21 classification

[Simon Wunderlich]

Hey Joe,

thanks for the comments!

> On Wed, 2014-02-12 at 11:53 +0100, Simon Wunderlich wrote:
> > MPLS labels may contain traffic control information, which should be
> > evaluated and used by the wireless subsystem if present.
> 
> trivial notes:
> > diff --git a/net/wireless/util.c b/net/wireless/util.c
> 
> []
> 
> > @@ -11,6 +11,7 @@
> > 
> >  #include <net/ip.h>
> >  #include <net/dsfield.h>
> >  #include <linux/if_vlan.h>
> > 
> > +#include <uapi/linux/mpls.h>
> 
> Please try not to #include uapi files.
> 

why not? The packet definition header has been put in UAPI, so I need that 
there ... or should we move that to some place else? Other protocol definition 
headers like IP, udp, tcp have been defined in uapi too the same way, so I 
figured that would be the right position.

> > @@ -710,6 +711,29 @@ unsigned int cfg80211_classify8021d(struct sk_buff
> > *skb,
> > 
> >  			return vlan_priority;
> >  	
> >  	}
> > 
> > +	if (skb_headlen(skb) >= sizeof(struct ethhdr)) {
> > +		struct ethhdr *eh = (struct ethhdr *) skb->data;
> > +		struct mpls_label_stack mpls_tmp, *mpls;
> > +
> > +		switch (eh->h_proto) {
> > +		case __constant_htons(ETH_P_MPLS_UC):
> 
> > +		case __constant_htons(ETH_P_MPLS_MC):
> __constant_ isn't necessary for these labels.
> 

OK, I will change that.

> >  	switch (skb->protocol) {
> >  	
> >  	case htons(ETH_P_IP):
> >  		dscp = ipv4_get_dsfield(ip_hdr(skb)) & 0xfc;
> 
> like this, just case htons(ETH_<FOO>) is enough.

OK.

I can rework and resend this particular patch - probably to linux wireless. If 
the other patches are ok, would you guys merge the first two patches to net-
next then?

Thanks,
    Simon

Re: [net-next 3/3] cfg80211: add MPLS and 802.21 classification

[Joe Perches]

On Thu, 2014-02-13 at 11:46 +0100, Simon Wunderlich wrote:

Hi Simon

> > On Wed, 2014-02-12 at 11:53 +0100, Simon Wunderlich wrote:
> > > MPLS labels may contain traffic control information, which should be
> > > evaluated and used by the wireless subsystem if present.
[]
> > > diff --git a/net/wireless/util.c b/net/wireless/util.c
[]
> > > +#include <uapi/linux/mpls.h>
> > 
> > Please try not to #include uapi files.
> why not? The packet definition header has been put in UAPI, so I need that 
> there ... or should we move that to some place else? Other protocol definition 
> headers like IP, udp, tcp have been defined in uapi to the same way, so I 
> figured that would be the right position.

It seems the practice is to have another include/<net|linux>/mpls.h
file that #includes the <uapi/linux/mpls.h>

For instance, look at:

include/linux/udp.h

It does #include <uapi/linux/udp.h>

All the other kernel sources use

#include <linux/udp.h>