diff options
Diffstat (limited to 'sys/net/if_disc.c')
| -rw-r--r-- | sys/net/if_disc.c | 203 |
1 files changed, 203 insertions, 0 deletions
diff --git a/sys/net/if_disc.c b/sys/net/if_disc.c new file mode 100644 index 0000000..66bd5f8 --- /dev/null +++ b/sys/net/if_disc.c @@ -0,0 +1,203 @@ +/* + * Copyright (c) 1982, 1986, 1993 + * The 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 8.1 (Berkeley) 6/10/93 + * $FreeBSD$ + */ + +/* + * Discard interface driver for protocol testing and timing. + * (Based on the loopback.) + */ + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/kernel.h> +#include <sys/mbuf.h> +#include <sys/socket.h> +#include <sys/sockio.h> + +#include <net/if.h> +#include <net/if_types.h> +#include <net/route.h> +#include <net/bpf.h> + +#include "opt_inet.h" +#include "opt_inet6.h" + +#ifdef TINY_DSMTU +#define DSMTU (1024+512) +#else +#define DSMTU 65532 +#endif + +static void discattach __P((void *dummy)); +PSEUDO_SET(discattach, if_disc); + +static struct ifnet discif; +static int discoutput(struct ifnet *, struct mbuf *, struct sockaddr *, + struct rtentry *); +static void discrtrequest(int cmd, struct rtentry *rt, struct sockaddr *sa); +static int discioctl(struct ifnet *, u_long, caddr_t); + +/* ARGSUSED */ +static void +discattach(dummy) + void *dummy; +{ + register struct ifnet *ifp = &discif; + + ifp->if_name = "ds"; + ifp->if_mtu = DSMTU; + ifp->if_flags = IFF_LOOPBACK | IFF_MULTICAST; + ifp->if_ioctl = discioctl; + ifp->if_output = discoutput; + ifp->if_type = IFT_LOOP; + ifp->if_hdrlen = 0; + ifp->if_addrlen = 0; + ifp->if_snd.ifq_maxlen = 20; + if_attach(ifp); + bpfattach(ifp, DLT_NULL, sizeof(u_int)); +} + +static int +discoutput(ifp, m, dst, rt) + struct ifnet *ifp; + register struct mbuf *m; + struct sockaddr *dst; + register struct rtentry *rt; +{ + if ((m->m_flags & M_PKTHDR) == 0) + panic("discoutput no HDR"); + /* BPF write needs to be handled specially */ + if (dst->sa_family == AF_UNSPEC) { + dst->sa_family = *(mtod(m, int *)); + m->m_len -= sizeof(int); + m->m_pkthdr.len -= sizeof(int); + m->m_data += sizeof(int); + } + + if (discif.if_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 a 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(&discif, &m0); + } + m->m_pkthdr.rcvif = ifp; + + ifp->if_opackets++; + ifp->if_obytes += m->m_pkthdr.len; + + m_freem(m); + return 0; +} + +/* ARGSUSED */ +static void +discrtrequest(cmd, rt, sa) + int cmd; + struct rtentry *rt; + struct sockaddr *sa; +{ + if (rt) + rt->rt_rmx.rmx_mtu = DSMTU; +} + +/* + * Process an ioctl request. + */ +/* ARGSUSED */ +static int +discioctl(ifp, cmd, data) + register struct ifnet *ifp; + u_long cmd; + caddr_t data; +{ + register struct ifaddr *ifa; + register struct ifreq *ifr = (struct ifreq *)data; + register int error = 0; + + switch (cmd) { + + case SIOCSIFADDR: + ifp->if_flags |= IFF_UP; + ifa = (struct ifaddr *)data; + if (ifa != 0) + ifa->ifa_rtrequest = discrtrequest; + /* + * Everything else is done at a higher level. + */ + break; + + case SIOCADDMULTI: + case SIOCDELMULTI: + if (ifr == 0) { + error = EAFNOSUPPORT; /* XXX */ + break; + } + switch (ifr->ifr_addr.sa_family) { + +#ifdef INET + case AF_INET: + break; +#endif +#ifdef INET6 + case AF_INET6: + break; +#endif + + default: + error = EAFNOSUPPORT; + break; + } + break; + + case SIOCSIFMTU: + ifp->if_mtu = ifr->ifr_mtu; + break; + + default: + error = EINVAL; + } + return (error); +} |
