cleanup

[unix-history] / usr / src / sys / net / if_loop.c

/*      if_loop.c       4.3     81/12/03        */

/*
* Loopback interface driver for protocol testing and timing.
*/

#include "../h/param.h"
#include "../h/systm.h"
#include "../h/mbuf.h"
#include "../h/socket.h"
#include "../net/in.h"
#include "../net/in_systm.h"
#include "../net/if.h"
#include "../net/ip.h"
#include "../net/ip_var.h"
#include "../h/mtpr.h"

#define LONET   254
#define LOMTU   1024

struct  ifnet loif;
int     looutput();

loattach()
{
       register struct ifnet *ifp = &loif;

       ifp->if_name = "lo";
       ifp->if_mtu = LOMTU;
       ifp->if_net = LONET;
       ifp->if_addr = if_makeaddr(ifp->if_net, 0);
       ifp->if_output = looutput;
       if_attach(ifp);
}

looutput(ifp, m0, pf)
       struct ifnet *ifp;
       struct mbuf *m0;
       int pf;
{
       int s = splimp();

       ifp->if_opackets++;
       switch (pf) {

#ifdef INET
       case PF_INET:
               IF_ENQUEUE(&ipintrq, m0);
               setipintr();
               break;
#endif

       default:
               splx(s);
               printf("lo%d: can't encapsulate pf%d\n", ifp->if_unit, pf);
               m_freem(m0);
               return (0);
       }
       ifp->if_ipackets++;
       splx(s);
       return (1);
}