Teach an IPv6 to ppp(4).

Obtained from:	NetBSD
MFC after:	1 week

3 files changed, 67 insertions, 2 deletions

diff --git a/sys/modules/if_ppp/Makefile b/sys/modules/if_ppp/Makefile
index 5ba5039..ce7bdb0 100644
--- a/sys/modules/if_ppp/Makefile
+++ b/sys/modules/if_ppp/Makefile
@@ -4,12 +4,17 @@
 
 KMOD=	if_ppp
 SRCS=	if_ppp.c ppp_tty.c slcompress.c \
-	opt_inet.h opt_ipx.h opt_mac.h opt_ppp.h
+	opt_inet.h opt_inet6.h opt_ipx.h opt_mac.h opt_ppp.h
 
 PPP_BSDCOMP?=	1	# 0/1
 PPP_DEFLATE?=	1	# 0/1
 PPP_FILTER?=	1	# 0/1 - requires bpf to be configured in kernel
 PPP_INET?=	1	# 0/1 - requires INET to be configured in kernel
+.if defined(NO_INET6)
+PPP_INET6?=	0	# 0/1 - requires INET6 to be configured in kernel
+.else
+PPP_INET6?=	1	# 0/1 - requires INET6 to be configured in kernel
+.endif
 PPP_IPX?=	0	# 0/1 - requires IPX to be configured in kernel
 
 .if ${PPP_BSDCOMP} > 0
@@ -25,6 +30,11 @@ opt_inet.h:
 	echo "#define INET 1" > ${.TARGET}
 .endif
 
+.if ${PPP_INET6} > 0
+opt_inet6.h:
+	echo "#define INET6 1" > ${.TARGET}
+.endif
+
 .if ${PPP_IPX} > 0
 opt_ipx.h:
 	echo "#define IPX ${PPP_IPX}" > ${.TARGET}
diff --git a/sys/net/if_ppp.c b/sys/net/if_ppp.c
index d01ed8f..394aa8d 100644
--- a/sys/net/if_ppp.c
+++ b/sys/net/if_ppp.c
@@ -76,6 +76,7 @@
 /* from NetBSD: if_ppp.c,v 1.15.2.2 1994/07/28 05:17:58 cgd Exp */
 
 #include "opt_inet.h"
+#include "opt_inet6.h"
 #include "opt_ipx.h"
 #include "opt_mac.h"
 #include "opt_ppp.h"
@@ -567,6 +568,9 @@ pppioctl(sc, cmd, data, flag, td)
 	case PPP_IP:
 	    npx = NP_IP;
 	    break;
+	case PPP_IPV6:
+	    npx = NP_IPV6;
+	    break;
 	default:
 	    error = EINVAL;
 	}
@@ -675,6 +679,10 @@ pppsioctl(ifp, cmd, data)
 	case AF_INET:
 	    break;
 #endif
+#ifdef INET6
+	case AF_INET6:
+	    break;
+#endif
 #ifdef IPX
 	case AF_IPX:
 	    break;
@@ -691,6 +699,10 @@ pppsioctl(ifp, cmd, data)
 	case AF_INET:
 	    break;
 #endif
+#ifdef INET6
+	case AF_INET6:
+	    break;
+#endif
 #ifdef IPX
 	case AF_IPX:
 	    break;
@@ -732,6 +744,10 @@ pppsioctl(ifp, cmd, data)
 	case AF_INET:
 	    break;
 #endif
+#ifdef INET6
+	case AF_INET6:
+	    break;
+#endif
 	default:
 	    error = EAFNOSUPPORT;
 	    break;
@@ -829,6 +845,24 @@ pppoutput(ifp, m0, dst, rtp)
 	    m0->m_flags |= M_HIGHPRI;
 	break;
 #endif
+#ifdef INET6
+    case AF_INET6:
+	address = PPP_ALLSTATIONS;	/*XXX*/
+	control = PPP_UI;		/*XXX*/
+	protocol = PPP_IPV6;
+	mode = sc->sc_npmode[NP_IPV6];
+
+#if 0	/* XXX flowinfo/traffic class, maybe? */
+	/*
+	 * If this packet has the "low delay" bit set in the IP header,
+	 * put it on the fastq instead.
+	 */
+	ip = mtod(m0, struct ip *);
+	if (ip->ip_tos & IPTOS_LOWDELAY)
+	    m0->m_flags |= M_HIGHPRI;
+#endif
+	break;
+#endif
 #ifdef IPX
     case AF_IPX:
 	/*
@@ -985,6 +1019,9 @@ ppp_requeue(sc)
 	case PPP_IP:
 	    mode = sc->sc_npmode[NP_IP];
 	    break;
+	case PPP_IPV6:
+	    mode = sc->sc_npmode[NP_IPV6];
+	    break;
 	default:
 	    mode = NPMODE_PASS;
 	}
@@ -1587,6 +1624,23 @@ ppp_inproc(sc, m)
 	isr = NETISR_IP;
 	break;
 #endif
+#ifdef INET6
+    case PPP_IPV6:
+	/*
+	 * IPv6 packet - take off the ppp header and pass it up to IPv6.
+	 */
+	if ((ifp->if_flags & IFF_UP) == 0
+	    || sc->sc_npmode[NP_IPV6] != NPMODE_PASS) {
+	    /* interface is down - drop the packet. */
+	    m_freem(m);
+	    return;
+	}
+	m->m_pkthdr.len -= PPP_HDRLEN;
+	m->m_data += PPP_HDRLEN;
+	m->m_len -= PPP_HDRLEN;
+	isr = NETISR_IPV6;
+	break;
+#endif
 #ifdef IPX
     case PPP_IPX:
 	/*
diff --git a/sys/net/if_pppvar.h b/sys/net/if_pppvar.h
index 12c308f..75d99a8 100644
--- a/sys/net/if_pppvar.h
+++ b/sys/net/if_pppvar.h
@@ -48,7 +48,8 @@
  * indexing sc_npmode.
  */
 #define NP_IP	0		/* Internet Protocol */
-#define NUM_NP	1		/* Number of NPs. */
+#define NP_IPV6	1		/* Internet Protocol version 6 */
+#define NUM_NP	2		/* Number of NPs. */
 
 /*
  * Structure describing each ppp unit.