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33 * From: @(#)if_loop.c 8.1 (Berkeley) 6/10/93
34 * $FreeBSD: src/sys/net/if_disc.c,v 1.26.2.2 2001/12/20 10:30:16 ru Exp $
35 * $DragonFly: src/sys/net/disc/if_disc.c,v 1.10 2006/12/22 23:44:55 swildner Exp $
39 * Discard interface driver for protocol testing and timing.
40 * (Based on the loopback.)
43 #include <sys/param.h>
44 #include <sys/systm.h>
45 #include <sys/kernel.h>
46 #include <sys/module.h>
48 #include <sys/socket.h>
49 #include <sys/sockio.h>
52 #include <net/if_types.h>
53 #include <net/route.h>
57 #include "opt_inet6.h"
60 #define DSMTU (1024+512)
65 static void discattach (void);
67 static struct ifnet discif;
68 static int discoutput(struct ifnet *, struct mbuf *, struct sockaddr *,
70 static void discrtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info);
71 static int discioctl(struct ifnet *, u_long, caddr_t, struct ucred *);
77 struct ifnet *ifp = &discif;
79 if_initname(ifp, "ds", IF_DUNIT_NONE);
81 ifp->if_flags = IFF_LOOPBACK | IFF_MULTICAST;
82 ifp->if_ioctl = discioctl;
83 ifp->if_output = discoutput;
84 ifp->if_type = IFT_LOOP;
87 ifp->if_snd.ifq_maxlen = 20;
89 bpfattach(ifp, DLT_NULL, sizeof(u_int));
93 disc_modevent(module_t mod, int type, void *data)
100 kprintf("if_disc module unload - not possible for this module type\n");
106 static moduledata_t disc_mod = {
112 DECLARE_MODULE(if_disc, disc_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
115 discoutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
118 if ((m->m_flags & M_PKTHDR) == 0)
119 panic("discoutput no HDR");
120 /* BPF write needs to be handled specially */
121 if (dst->sa_family == AF_UNSPEC) {
122 dst->sa_family = *(mtod(m, int *));
123 m->m_len -= sizeof(int);
124 m->m_pkthdr.len -= sizeof(int);
125 m->m_data += sizeof(int);
130 * We need to prepend the address family as
133 uint32_t af = dst->sa_family;
135 bpf_ptap(discif.if_bpf, m, &af, sizeof(af));
137 m->m_pkthdr.rcvif = ifp;
140 ifp->if_obytes += m->m_pkthdr.len;
148 discrtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info)
151 rt->rt_rmx.rmx_mtu = DSMTU;
155 * Process an ioctl request.
159 discioctl(struct ifnet *ifp, u_long cmd, caddr_t data, struct ucred *cr)
162 struct ifreq *ifr = (struct ifreq *)data;
168 ifp->if_flags |= IFF_UP;
169 ifa = (struct ifaddr *)data;
171 ifa->ifa_rtrequest = discrtrequest;
173 * Everything else is done at a higher level.
180 error = EAFNOSUPPORT; /* XXX */
183 switch (ifr->ifr_addr.sa_family) {
195 error = EAFNOSUPPORT;
201 ifp->if_mtu = ifr->ifr_mtu;