kern/src/net/nixip/pktmedium.c

#include <vfs.h>
#include <kfs.h>
#include <slab.h>
#include <kmalloc.h>
#include <kref.h>
#include <string.h>
#include <stdio.h>
#include <assert.h>
#include <error.h>
#include <cpio.h>
#include <pmap.h>
#include <smp.h>

static void pktbind(struct ipifc *unused_ipifc, int unused_int, char **);
static void pktunbind(struct ipifc *unused_ipifc);
static void pktbwrite(struct ipifc *unused_ipifc, struct block *,
					  int unused_int, uint8_t * unused_uint8_p_t);
static void pktin(struct fs *, struct ipifc *unused_ipifc, struct block *);

struct medium pktmedium = {
	.name = "pkt",
	.hsize = 14,
	.mintu = 40,
	.maxtu = 4 * 1024,
	.maclen = 6,
	.bind = pktbind,
	.unbind = pktunbind,
	.bwrite = pktbwrite,
	.pktin = pktin,
};

/*
 *  called to bind an IP ifc to an ethernet device
 *  called with ifc wlock'd
 */
static void pktbind(struct ipifc *unused_ipifc, int argc, char **argv)
{
}

/*
 *  called with ifc wlock'd
 */
static void pktunbind(struct ipifc *unused_ipifc)
{
}

/*
 *  called by ipoput with a single packet to write
 */
static void
pktbwrite(struct ipifc *ifc, struct block *bp, int unused_int,
		  uint8_t * unused_uint8_p_t)
{
	/* enqueue onto the conversation's rq */
	bp = concatblock(bp);
	if (kref_refcnt(&ifc->conv->snoopers) > 0)
		qpass(ifc->conv->sq, copyblock(bp, BLEN(bp)));
	qpass(ifc->conv->rq, bp);
}

/*
 *  called with ifc rlocked when someone write's to 'data'
 */
static void pktin(struct fs *f, struct ipifc *ifc, struct block *bp)
{
	if (ifc->lifc == NULL)
		freeb(bp);
	else {
		if (kref_refcnt(&ifc->conv->snoopers) > 0)
			qpass(ifc->conv->sq, copyblock(bp, BLEN(bp)));
		ipiput4(f, ifc, bp);
	}
}

void pktmediumlink(void)
{
	addipmedium(&pktmedium);
}