1 /* $KAME: if_faith.c,v 1.23 2001/12/17 13:55:29 sumikawa Exp $ */
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35 * @(#)if_loop.c 8.1 (Berkeley) 6/10/93
36 * Id: if_loop.c,v 1.22 1996/06/19 16:24:10 wollman Exp
40 * Loopback interface driver for protocol testing and timing.
43 #include "opt_inet6.h"
45 #include <sys/param.h>
46 #include <sys/systm.h>
47 #include <sys/kernel.h>
49 #include <sys/module.h>
50 #include <sys/socket.h>
51 #include <sys/errno.h>
52 #include <sys/sockio.h>
54 #include <sys/queue.h>
55 #include <sys/types.h>
56 #include <sys/malloc.h>
59 #include <net/if_clone.h>
60 #include <net/if_types.h>
61 #include <net/netisr.h>
62 #include <net/route.h>
67 #include <netinet/in.h>
68 #include <netinet/in_systm.h>
69 #include <netinet/in_var.h>
70 #include <netinet/ip.h>
75 #include <netinet/in.h>
77 #include <netinet6/in6_var.h>
78 #include <netinet/ip6.h>
79 #include <netinet6/ip6_var.h>
86 static int faithioctl(struct ifnet *, u_long, caddr_t);
87 static int faithoutput(struct ifnet *, struct mbuf *, const struct sockaddr *,
89 static void faithrtrequest(int, struct rtentry *, struct rt_addrinfo *);
91 static int faithprefix(struct in6_addr *);
94 static int faithmodevent(module_t, int, void *);
96 static const char faithname[] = "faith";
97 static MALLOC_DEFINE(M_FAITH, faithname, "Firewall Assisted Tunnel Interface");
99 static int faith_clone_create(struct if_clone *, int, caddr_t);
100 static void faith_clone_destroy(struct ifnet *);
101 static struct if_clone *faith_cloner;
103 #define FAITHMTU 1500
106 faithmodevent(mod, type, data)
114 faith_cloner = if_clone_simple(faithname, faith_clone_create,
115 faith_clone_destroy, 0);
117 faithprefix_p = faithprefix;
123 faithprefix_p = NULL;
126 if_clone_detach(faith_cloner);
134 static moduledata_t faith_mod = {
140 DECLARE_MODULE(if_faith, faith_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
141 MODULE_VERSION(if_faith, 1);
144 faith_clone_create(ifc, unit, params)
145 struct if_clone *ifc;
150 struct faith_softc *sc;
152 sc = malloc(sizeof(struct faith_softc), M_FAITH, M_WAITOK | M_ZERO);
153 ifp = sc->sc_ifp = if_alloc(IFT_FAITH);
160 if_initname(sc->sc_ifp, faithname, unit);
162 ifp->if_mtu = FAITHMTU;
163 /* Change to BROADCAST experimentaly to announce its prefix. */
164 ifp->if_flags = /* IFF_LOOPBACK */ IFF_BROADCAST | IFF_MULTICAST;
165 ifp->if_ioctl = faithioctl;
166 ifp->if_output = faithoutput;
169 ifp->if_snd.ifq_maxlen = ifqmaxlen;
171 bpfattach(ifp, DLT_NULL, sizeof(u_int32_t));
176 faith_clone_destroy(ifp)
179 struct faith_softc *sc = ifp->if_softc;
188 faithoutput(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst,
193 struct rtentry *rt = NULL;
199 /* BPF writes need to be handled specially. */
200 if (dst->sa_family == AF_UNSPEC)
201 bcopy(dst->sa_data, &af, sizeof(af));
205 if (bpf_peers_present(ifp->if_bpf))
206 bpf_mtap2(ifp->if_bpf, &af, sizeof(af), m);
208 if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) {
210 return (rt->rt_flags & RTF_BLACKHOLE ? 0 :
211 rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH);
214 ifp->if_obytes += m->m_pkthdr.len;
231 /* XXX do we need more sanity checks? */
233 m->m_pkthdr.rcvif = ifp;
235 ifp->if_ibytes += m->m_pkthdr.len;
236 netisr_dispatch(isr, m);
242 faithrtrequest(cmd, rt, info)
245 struct rt_addrinfo *info;
248 rt->rt_rmx.rmx_mtu = rt->rt_ifp->if_mtu;
252 * Process an ioctl request.
256 faithioctl(ifp, cmd, data)
262 struct ifreq *ifr = (struct ifreq *)data;
268 ifp->if_flags |= IFF_UP;
269 ifp->if_drv_flags |= IFF_DRV_RUNNING;
270 ifa = (struct ifaddr *)data;
271 ifa->ifa_rtrequest = faithrtrequest;
273 * Everything else is done at a higher level.
280 error = EAFNOSUPPORT; /* XXX */
283 switch (ifr->ifr_addr.sa_family) {
294 error = EAFNOSUPPORT;
301 ifp->if_mtu = ifr->ifr_mtu;
317 * XXX could be layer violation to call sys/net from sys/netinet6
321 struct in6_addr *in6;
324 struct sockaddr_in6 sin6;
327 if (V_ip6_keepfaith == 0)
330 bzero(&sin6, sizeof(sin6));
331 sin6.sin6_family = AF_INET6;
332 sin6.sin6_len = sizeof(struct sockaddr_in6);
333 sin6.sin6_addr = *in6;
334 rt = in6_rtalloc1((struct sockaddr *)&sin6, 0, 0UL, RT_DEFAULT_FIB);
335 if (rt && rt->rt_ifp && rt->rt_ifp->if_type == IFT_FAITH &&
336 (rt->rt_ifp->if_flags & IFF_UP) != 0)