Add hooks into the networking layer to support if_bridge. This changes struct

ifnet so a buildworld is necessary.

Approved by:	mlaier (mentor)
Obtained from:	NetBSD

sys/net/if.c

@@ -93,6 +93,7 @@ SYSCTL_INT(_net_link, OID_AUTO, log_link_state_change, CTLFLAG_RW,
 	&log_link_state_change, 0,
 	"log interface link state change events");
 
+void	(*bstp_linkstate_p)(struct ifnet *ifp, int state);
 void	(*ng_ether_link_state_p)(struct ifnet *ifp, int state);
 
 struct mbuf *(*tbr_dequeue_ptr)(struct ifaltq *, int) = NULL;
@@ -337,6 +338,7 @@ if_findindex(struct ifnet *ifp)
 	case IFT_XETHER:
 	case IFT_ISO88025:
 	case IFT_L2VLAN:
+	case IFT_BRIDGE:
 		snprintf(eaddr, 18, "%6D", IFP2AC(ifp)->ac_enaddr, ":");
 		break;
 	default:
@@ -1049,6 +1051,11 @@ do_link_state_change(void *arg, int pending)
 	if (ifp->if_carp)
 		carp_carpdev_state(ifp->if_carp);
 #endif
+	if (ifp->if_bridge) {
+		KASSERT(bstp_linkstate_p != NULL,("if_bridge bstp not loaded!"));
+		(*bstp_linkstate_p)(ifp, link_state);
+	}
+
 	if (pending > 1)
 		if_printf(ifp, "%d link states coalesced\n", pending);
 	if (log_link_state_change)
@@ -1932,6 +1939,7 @@ if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len)
 	case IFT_XETHER:
 	case IFT_ISO88025:
 	case IFT_L2VLAN:
+	case IFT_BRIDGE:
 		bcopy(lladdr, IFP2AC(ifp)->ac_enaddr, len);
 		/*
 		 * XXX We also need to store the lladdr in LLADDR(sdl),

sys/net/if.h

@@ -281,6 +281,13 @@ struct ifmediareq {
 	int	*ifm_ulist;		/* media words */
 };
 
+struct  ifdrv {
+	char            ifd_name[IFNAMSIZ];     /* if name, e.g. "en0" */
+	unsigned long   ifd_cmd;
+	size_t          ifd_len;
+	void            *ifd_data;
+};
+
 /* 
  * Structure used to retrieve aux status data from interfaces.
  * Kernel suppliers to this interface should respect the formatting

sys/net/if_ethersubr.c

@@ -114,6 +114,10 @@ bdg_forward_t *bdg_forward_ptr;
 bdgtakeifaces_t *bdgtakeifaces_ptr;
 struct bdg_softc *ifp2sc;
 
+struct mbuf *(*bridge_input_p)(struct ifnet *, struct mbuf *); 
+int     (*bridge_output_p)(struct ifnet *, struct mbuf *, 
+		struct sockaddr *, struct rtentry *);
+
 static const u_char etherbroadcastaddr[ETHER_ADDR_LEN] =
 			{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 
@@ -283,6 +287,15 @@ ether_output(struct ifnet *ifp, struct mbuf *m,
 		(void)memcpy(eh->ether_shost, IFP2AC(ifp)->ac_enaddr,
 			sizeof(eh->ether_shost));
 
+       /*
+	* Bridges require special output handling.
+	*/
+	if (ifp->if_bridge) {
+		KASSERT(bridge_output_p != NULL,
+		    ("ether_input: if_bridge not loaded!"));
+		return ((*bridge_output_p)(ifp, m, NULL, NULL));
+	}
+
 	/*
 	 * If a simplex interface, and the packet is being sent to our
 	 * Ethernet address or a broadcast address, loopback a copy.
@@ -577,6 +590,41 @@ ether_input(struct ifnet *ifp, struct mbuf *m)
 			return;
 	}
 
+	/*
+	* Tap the packet off here for a bridge.  bridge_input()
+	* will return NULL if it has consumed the packet, otherwise
+	* it gets processed as normal.  Note that bridge_input()
+	* will always return the original packet if we need to
+	* process it locally.
+	*/
+	if (ifp->if_bridge) {
+		KASSERT(bridge_input_p != NULL,
+		    ("ether_input: if_bridge not loaded!"));
+
+		/* Mark the packet as broadcast or multicast. This is also set
+		 * further down the code in ether_demux() but since the bridge
+		 * input routine rarely returns a mbuf for further processing,
+		 * it is an acceptable duplication.
+		 */
+		if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
+			if (bcmp(etherbroadcastaddr, eh->ether_dhost,
+				sizeof(etherbroadcastaddr)) == 0)
+				m->m_flags |= M_BCAST;
+			else
+				m->m_flags |= M_MCAST;
+		}
+	
+		m = (*bridge_input_p)(ifp, m);
+		if (m == NULL)
+			return;
+		/*
+		* Bridge has determined that the packet is for us.
+		* Update our interface pointer -- we may have had
+		* to "bridge" the packet locally.
+		*/
+		ifp = m->m_pkthdr.rcvif;
+	}
+
 	/* Check for bridging mode */
 	if (BDG_ACTIVE(ifp) )
 		if ((m = bridge_in_ptr(ifp, m)) == NULL)

sys/net/if_llc.h

@@ -149,6 +149,7 @@ struct frmrinfo {
 /*
  * ISO PDTR 10178 contains among others
  */
+#define LLC_8021D_LSAP	0x42
 #define LLC_X25_LSAP	0x7e
 #define LLC_SNAP_LSAP	0xaa
 #define LLC_ISO_LSAP	0xfe

sys/net/if_types.h

@@ -238,6 +238,7 @@
 #define	IFT_ATMVCIENDPT		   0xc2 /* ATM VCI End Point */
 #define	IFT_OPTICALCHANNEL	   0xc3 /* Optical Channel */
 #define	IFT_OPTICALTRANSPORT	   0xc4 /* Optical Transport */
+#define	IFT_BRIDGE		   0xd1 /* Transparent bridge interface */
 
 #define	IFT_STF			   0xd7	/* 6to4 interface */
 

sys/net/if_var.h

@@ -184,6 +184,8 @@ struct ifnet {
 	struct  ifaltq if_snd;		/* output queue (includes altq) */
 	const u_int8_t *if_broadcastaddr; /* linklevel broadcast bytestring */
 
+	void	*if_bridge;		/* bridge glue */
+
 	struct	lltable *lltables;	/* list of L3-L2 resolution tables */
 
 	struct	label *if_label;	/* interface MAC label */

sys/netinet/if_ether.c

@@ -553,10 +553,14 @@ in_arpinput(m)
 	u_int8_t *enaddr = NULL;
 	int op, rif_len;
 	int req_len;
+	int bridged = 0;
 #ifdef DEV_CARP
 	int carp_match = 0;
 #endif
 
+	if (do_bridge || ifp->if_bridge)
+		bridged = 1;
+
 	req_len = arphdr_len2(ifp->if_addrlen, sizeof(struct in_addr));
 	if (m->m_len < req_len && (m = m_pullup(m, req_len)) == NULL) {
 		log(LOG_ERR, "in_arp: runt packet -- m_pullup failed\n");
@@ -578,7 +582,7 @@ in_arpinput(m)
 	 * XXX: This is really ugly!
 	 */
 	LIST_FOREACH(ia, INADDR_HASH(itaddr.s_addr), ia_hash) {
-		if ((do_bridge || (ia->ia_ifp == ifp)) &&
+		if ((bridged || (ia->ia_ifp == ifp)) &&
 		    itaddr.s_addr == ia->ia_addr.sin_addr.s_addr)
 			goto match;
 #ifdef DEV_CARP
@@ -591,7 +595,7 @@ in_arpinput(m)
 #endif
 	}
 	LIST_FOREACH(ia, INADDR_HASH(isaddr.s_addr), ia_hash)
-		if ((do_bridge || (ia->ia_ifp == ifp)) &&
+		if ((bridged || (ia->ia_ifp == ifp)) &&
 		    isaddr.s_addr == ia->ia_addr.sin_addr.s_addr)
 			goto match;
 	/*
@@ -606,7 +610,7 @@ in_arpinput(m)
 	/*
 	 * If bridging, fall back to using any inet address.
 	 */
-	if (!do_bridge || (ia = TAILQ_FIRST(&in_ifaddrhead)) == NULL)
+	if (!bridged || (ia = TAILQ_FIRST(&in_ifaddrhead)) == NULL)
 		goto drop;
 match:
 	if (!enaddr)
@@ -639,7 +643,7 @@ in_arpinput(m)
 	la = arplookup(isaddr.s_addr, itaddr.s_addr == myaddr.s_addr, 0);
 	if (la && (rt = la->la_rt) && (sdl = SDL(rt->rt_gateway))) {
 		/* the following is not an error when doing bridging */
-		if (!do_bridge && rt->rt_ifp != ifp
+		if (!bridged && rt->rt_ifp != ifp
 #ifdef DEV_CARP
 		    && (ifp->if_type != IFT_CARP || !carp_match)
 #endif

sys/sys/sockio.h

@@ -105,6 +105,11 @@
 #define	SIOCGPRIVATE_0	_IOWR('i', 80, struct ifreq)	/* device private 0 */
 #define	SIOCGPRIVATE_1	_IOWR('i', 81, struct ifreq)	/* device private 1 */
 
+#define	SIOCSDRVSPEC	_IOW('i', 123, struct ifdrv)	/* set driver-specific
+								  parameters */
+#define	SIOCGDRVSPEC	_IOWR('i', 123, struct ifdrv)	/* get driver-specific
+								  parameters */
+
 #define	SIOCIFCREATE	_IOWR('i', 122, struct ifreq)	/* create clone if */
 #define	SIOCIFDESTROY	 _IOW('i', 121, struct ifreq)	/* destroy clone if */
 #define	SIOCIFGCLONERS	_IOWR('i', 120, struct if_clonereq) /* get cloners */