diff options
Diffstat (limited to 'sys/net/if_loop.c')
| -rw-r--r-- | sys/net/if_loop.c | 218 |
1 files changed, 218 insertions, 0 deletions
diff --git a/sys/net/if_loop.c b/sys/net/if_loop.c new file mode 100644 index 000000000000..40492d421843 --- /dev/null +++ b/sys/net/if_loop.c @@ -0,0 +1,218 @@ +/* + * Copyright (c) 1982, 1986 Regents of the University of California. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * from: @(#)if_loop.c 7.13 (Berkeley) 4/26/91 + * $Id: if_loop.c,v 1.2 1993/10/16 17:43:19 rgrimes Exp $ + */ + +/* + * Loopback interface driver for protocol testing and timing. + */ + +#include "param.h" +#include "systm.h" +#include "mbuf.h" +#include "socket.h" +#include "errno.h" +#include "ioctl.h" + +#include "../net/if.h" +#include "../net/if_types.h" +#include "../net/netisr.h" +#include "../net/route.h" + +#include "machine/mtpr.h" + +#ifdef INET +#include "../netinet/in.h" +#include "../netinet/in_systm.h" +#include "../netinet/in_var.h" +#include "../netinet/ip.h" +#endif + +#ifdef NS +#include "../netns/ns.h" +#include "../netns/ns_if.h" +#endif + +#ifdef ISO +#include "../netiso/iso.h" +#include "../netiso/iso_var.h" +#endif + +#include "bpfilter.h" +#if NBPFILTER > 0 +#include <sys/time.h> +#include <net/bpf.h> +static caddr_t lo_bpf; +#endif + +#define LOMTU (1024+512) + +struct ifnet loif; +int looutput(), loioctl(); + +loattach() +{ + register struct ifnet *ifp = &loif; + + ifp->if_name = "lo"; + ifp->if_mtu = LOMTU; + ifp->if_flags = IFF_LOOPBACK; + ifp->if_ioctl = loioctl; + ifp->if_output = looutput; + ifp->if_type = IFT_LOOP; + ifp->if_hdrlen = 0; + ifp->if_addrlen = 0; + if_attach(ifp); +#if NBPFILTER > 0 + bpfattach(&lo_bpf, ifp, DLT_NULL, sizeof(u_int)); +#endif +} + +looutput(ifp, m, dst, rt) + struct ifnet *ifp; + register struct mbuf *m; + struct sockaddr *dst; + register struct rtentry *rt; +{ + int s, isr; + register struct ifqueue *ifq = 0; + + if ((m->m_flags & M_PKTHDR) == 0) + panic("looutput no HDR"); +#if NBPFILTER > 0 + if (lo_bpf) { + /* + * We need to prepend the address family as + * a four byte field. Cons up a dummy header + * to pacify bpf. This is safe because bpf + * will only read from the mbuf (i.e., it won't + * try to free it or keep a pointer to it). + */ + struct mbuf m0; + u_int af = dst->sa_family; + + m0.m_next = m; + m0.m_len = 4; + m0.m_data = (char *)⁡ + + bpf_mtap(lo_bpf, &m0); + } +#endif + m->m_pkthdr.rcvif = ifp; + + if (rt && rt->rt_flags & RTF_REJECT) { + m_freem(m); + return (rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH); + } + ifp->if_opackets++; + ifp->if_obytes += m->m_pkthdr.len; + switch (dst->sa_family) { + +#ifdef INET + case AF_INET: + ifq = &ipintrq; + isr = NETISR_IP; + break; +#endif +#ifdef NS + case AF_NS: + ifq = &nsintrq; + isr = NETISR_NS; + break; +#endif +#ifdef ISO + case AF_ISO: + ifq = &clnlintrq; + isr = NETISR_ISO; + break; +#endif + default: + printf("lo%d: can't handle af%d\n", ifp->if_unit, + dst->sa_family); + m_freem(m); + return (EAFNOSUPPORT); + } + s = splimp(); + if (IF_QFULL(ifq)) { + IF_DROP(ifq); + m_freem(m); + splx(s); + return (ENOBUFS); + } + IF_ENQUEUE(ifq, m); + schednetisr(isr); + ifp->if_ipackets++; + ifp->if_ibytes += m->m_pkthdr.len; + splx(s); + return (0); +} + +/* ARGSUSED */ +lortrequest(cmd, rt, sa) +struct rtentry *rt; +struct sockaddr *sa; +{ + if (rt) + rt->rt_rmx.rmx_mtu = LOMTU; +} + +/* + * Process an ioctl request. + */ +/* ARGSUSED */ +loioctl(ifp, cmd, data) + register struct ifnet *ifp; + int cmd; + caddr_t data; +{ + register struct ifaddr *ifa; + int error = 0; + + switch (cmd) { + + case SIOCSIFADDR: + ifp->if_flags |= IFF_UP; + ifa = (struct ifaddr *)data; + if (ifa != 0 && ifa->ifa_addr->sa_family == AF_ISO) + ifa->ifa_rtrequest = lortrequest; + /* + * Everything else is done at a higher level. + */ + break; + + default: + error = EINVAL; + } + return (error); +} |