BSD 4_2 development

Work on file usr/src/sys/netinet/if_loop.c

Synthesized-from: CSRG/cd1/4.2

diff --git a/usr/src/sys/netinet/if_loop.c b/usr/src/sys/netinet/if_loop.c
new file mode 100644 (file)
index 0000000..2c46759
--- /dev/null
+++ b/usr/src/sys/netinet/if_loop.c
@@ -0,0 +1,118 @@
+/*     if_loop.c       6.1     83/07/29        */
+
+/*
+ * 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 "../h/errno.h"
+#include "../h/ioctl.h"
+
+#include "../net/if.h"
+#include "../net/netisr.h"
+#include "../net/route.h"
+
+#include "../netinet/in.h"
+#include "../netinet/in_systm.h"
+#include "../netinet/ip.h"
+#include "../netinet/ip_var.h"
+
+#ifdef vax
+#include "../vax/mtpr.h"
+#endif
+
+#define        LONET   127
+#define        LOHOST  1                       /* can't be 0, that's broadcast */
+#define        LOMTU   (1024+512)
+
+struct ifnet loif;
+int    looutput(), loioctl();
+
+loattach()
+{
+       register struct ifnet *ifp = &loif;
+       register struct sockaddr_in *sin;
+
+       ifp->if_name = "lo";
+       ifp->if_mtu = LOMTU;
+       ifp->if_net = LONET;
+       ifp->if_host[0] = LOHOST;
+       sin = (struct sockaddr_in *)&ifp->if_addr;
+       sin->sin_family = AF_INET;
+       sin->sin_addr = if_makeaddr(LONET, LOHOST);
+       ifp->if_flags = IFF_UP | IFF_RUNNING;
+       ifp->if_ioctl = loioctl;
+       ifp->if_output = looutput;
+       if_attach(ifp);
+       if_rtinit(ifp, RTF_UP);
+}
+
+looutput(ifp, m0, dst)
+       struct ifnet *ifp;
+       struct mbuf *m0;
+       struct sockaddr *dst;
+{
+       int s = splimp();
+       register struct ifqueue *ifq;
+
+       ifp->if_opackets++;
+       switch (dst->sa_family) {
+
+#ifdef INET
+       case AF_INET:
+               ifq = &ipintrq;
+               if (IF_QFULL(ifq)) {
+                       IF_DROP(ifq);
+                       m_freem(m0);
+                       splx(s);
+                       return (ENOBUFS);
+               }
+               IF_ENQUEUE(ifq, m0);
+               schednetisr(NETISR_IP);
+               break;
+#endif
+       default:
+               splx(s);
+               printf("lo%d: can't handle af%d\n", ifp->if_unit,
+                       dst->sa_family);
+               m_freem(m0);
+               return (EAFNOSUPPORT);
+       }
+       ifp->if_ipackets++;
+       splx(s);
+       return (0);
+}
+
+/*
+ * Process an ioctl request.
+ */
+loioctl(ifp, cmd, data)
+       register struct ifnet *ifp;
+       int cmd;
+       caddr_t data;
+{
+       struct ifreq *ifr = (struct ifreq *)data;
+       struct sockaddr_in *sin;
+       int s = splimp(), error = 0;
+
+       switch (cmd) {
+
+       case SIOCSIFADDR:
+               if (ifp->if_flags & IFF_RUNNING)
+                       if_rtinit(ifp, -1);     /* delete previous route */
+               ifp->if_addr = ifr->ifr_addr;
+               sin = (struct sockaddr_in *)&ifp->if_addr;
+               ifp->if_net = in_netof(sin->sin_addr);
+               ifp->if_host[0] = in_lnaof(sin->sin_addr);
+               if_rtinit(ifp, RTF_UP);
+               break;
+
+       default:
+               error = EINVAL;
+       }
+       splx(s);
+       return (error);
+}