[MPLS]: Add MPLS support to PPP.

drivers/net/ppp_generic.c

@@ -57,7 +57,9 @@
 #define NP_IPV6	1		/* Internet Protocol V6 */
 #define NP_IPX	2		/* IPX protocol */
 #define NP_AT	3		/* Appletalk protocol */
-#define NUM_NP	4		/* Number of NPs. */
+#define NP_MPLS_UC 4		/* MPLS unicast */
+#define NP_MPLS_MC 5		/* MPLS multicast */
+#define NUM_NP	6		/* Number of NPs. */
 
 #define MPHDRLEN	6	/* multilink protocol header length */
 #define MPHDRLEN_SSN	4	/* ditto with short sequence numbers */
@@ -281,6 +283,10 @@ static inline int proto_to_npindex(int proto)
 		return NP_IPX;
 	case PPP_AT:
 		return NP_AT;
+	case PPP_MPLS_UC:
+		return NP_MPLS_UC;
+	case PPP_MPLS_MC:
+		return NP_MPLS_MC;
 	}
 	return -EINVAL;
 }
@@ -291,6 +297,8 @@ static const int npindex_to_proto[NUM_NP] = {
 	PPP_IPV6,
 	PPP_IPX,
 	PPP_AT,
+	PPP_MPLS_UC,
+	PPP_MPLS_MC,
 };
 	
 /* Translates an ethertype into an NP index */
@@ -306,6 +314,10 @@ static inline int ethertype_to_npindex(int ethertype)
 	case ETH_P_PPPTALK:
 	case ETH_P_ATALK:
 		return NP_AT;
+	case ETH_P_MPLS_UC:
+		return NP_MPLS_UC;
+	case ETH_P_MPLS_MC:
+		return NP_MPLS_MC;
 	}
 	return -1;
 }
@@ -316,6 +328,8 @@ static const int npindex_to_ethertype[NUM_NP] = {
 	ETH_P_IPV6,
 	ETH_P_IPX,
 	ETH_P_PPPTALK,
+	ETH_P_MPLS_UC,
+	ETH_P_MPLS_MC,
 };
 
 /*

include/linux/ppp_defs.h

@@ -74,12 +74,15 @@
 #define PPP_IPV6	0x57	/* Internet Protocol Version 6 */
 #define PPP_COMPFRAG	0xfb	/* fragment compressed below bundle */
 #define PPP_COMP	0xfd	/* compressed packet */
+#define PPP_MPLS_UC	0x0281	/* Multi Protocol Label Switching - Unicast */
+#define PPP_MPLS_MC	0x0283	/* Multi Protocol Label Switching - Multicast */
 #define PPP_IPCP	0x8021	/* IP Control Protocol */
 #define PPP_ATCP	0x8029	/* AppleTalk Control Protocol */
 #define PPP_IPXCP	0x802b	/* IPX Control Protocol */
 #define PPP_IPV6CP	0x8057	/* IPv6 Control Protocol */
 #define PPP_CCPFRAG	0x80fb	/* CCP at link level (below MP bundle) */
 #define PPP_CCP		0x80fd	/* Compression Control Protocol */
+#define PPP_MPLSCP	0x80fd	/* MPLS Control Protocol */
 #define PPP_LCP		0xc021	/* Link Control Protocol */
 #define PPP_PAP		0xc023	/* Password Authentication Protocol */
 #define PPP_LQR		0xc025	/* Link Quality Report protocol */