1*6556Ssam /* if_loop.c 4.11 82/04/16 */ 25122Swnj 35122Swnj /* 45122Swnj * Loopback interface driver for protocol testing and timing. 55122Swnj */ 65122Swnj 75122Swnj #include "../h/param.h" 85122Swnj #include "../h/systm.h" 95122Swnj #include "../h/mbuf.h" 105122Swnj #include "../h/socket.h" 115122Swnj #include "../net/in.h" 125122Swnj #include "../net/in_systm.h" 135122Swnj #include "../net/if.h" 145122Swnj #include "../net/ip.h" 155122Swnj #include "../net/ip_var.h" 165122Swnj #include "../h/mtpr.h" 176366Ssam #include "../net/route.h" 18*6556Ssam #include <errno.h> 195122Swnj 205296Sroot #define LONET 127 215207Swnj #define LOMTU (1024+512) 225122Swnj 235122Swnj struct ifnet loif; 245122Swnj int looutput(); 255122Swnj 265122Swnj loattach() 275122Swnj { 285122Swnj register struct ifnet *ifp = &loif; 296337Ssam register struct sockaddr_in *sin; 305122Swnj 316366Ssam COUNT(LOATTACH); 325172Swnj ifp->if_name = "lo"; 335122Swnj ifp->if_mtu = LOMTU; 345122Swnj ifp->if_net = LONET; 356337Ssam sin = (struct sockaddr_in *)&ifp->if_addr; 366337Ssam sin->sin_family = AF_INET; 376337Ssam sin->sin_addr = if_makeaddr(ifp->if_net, 0); 386337Ssam ifp->if_flags = IFF_UP; 395122Swnj ifp->if_output = looutput; 405161Swnj if_attach(ifp); 416366Ssam if_rtinit(ifp, RTF_DIRECT|RTF_UP); 425122Swnj } 435122Swnj 446337Ssam looutput(ifp, m0, dst) 455122Swnj struct ifnet *ifp; 465122Swnj struct mbuf *m0; 476337Ssam struct sockaddr *dst; 485122Swnj { 495122Swnj int s = splimp(); 506209Swnj register struct ifqueue *ifq; 515122Swnj 526366Ssam COUNT(LOOUTPUT); 535172Swnj ifp->if_opackets++; 546337Ssam switch (dst->sa_family) { 555122Swnj 565122Swnj #ifdef INET 576337Ssam case AF_INET: 586209Swnj ifq = &ipintrq; 596209Swnj if (IF_QFULL(ifq)) { 606209Swnj IF_DROP(ifq); 616337Ssam m_freem(m0); 626209Swnj splx(s); 636544Sfeldman return (ENOBUFS); 646209Swnj } 656209Swnj IF_ENQUEUE(ifq, m0); 666262Swnj schednetisr(NETISR_IP); 675122Swnj break; 685122Swnj #endif 695122Swnj default: 705122Swnj splx(s); 716337Ssam printf("lo%d: can't handle af%d\n", ifp->if_unit, 726337Ssam dst->sa_family); 736337Ssam m_freem(m0); 746544Sfeldman return (EAFNOSUPPORT); 755122Swnj } 765172Swnj ifp->if_ipackets++; 775122Swnj splx(s); 786544Sfeldman return (0); 795122Swnj } 80