netdev - [net-next v2 3/3] cfg80211: add MPLS and 802.21 classification

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1392656174-14791-4-git-send-email-sw@simonwunderlich.de>
Date:	Mon, 17 Feb 2014 17:56:13 +0100
From:	Simon Wunderlich <sw@...onwunderlich.de>
To:	netdev@...r.kernel.org
Cc:	davem@...emloft.net, linux-wireless@...r.kernel.org,
	mathias.kretschmer@...us.fraunhofer.de,
	Simon Wunderlich <sw@...onwunderlich.de>
Subject: [net-next v2 3/3] cfg80211: add MPLS and 802.21 classification

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@...onwunderlich.de>
Signed-off-by: Mathias Kretschmer <mathias.kretschmer@...us.fraunhofer.de>
---
Changes to first version:

 * include linux/mpls.h, not the UAPI one
 * change __constant_htons to htons
---
 net/wireless/util.c |   24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/net/wireless/util.c b/net/wireless/util.c
index d39c371..54956eb 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 <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 htons(ETH_P_MPLS_UC):
+		case 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 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

--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html