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>
82 #define FAITHNAME "faith"
88 static int faithioctl(struct ifnet *, u_long, caddr_t);
89 int faithoutput(struct ifnet *, struct mbuf *, struct sockaddr *,
91 static void faithrtrequest(int, struct rtentry *, struct rt_addrinfo *);
93 static int faithprefix(struct in6_addr *);
96 static int faithmodevent(module_t, int, void *);
98 static MALLOC_DEFINE(M_FAITH, FAITHNAME, "Firewall Assisted Tunnel Interface");
100 static int faith_clone_create(struct if_clone *, int, caddr_t);
101 static void faith_clone_destroy(struct ifnet *);
103 IFC_SIMPLE_DECLARE(faith, 0);
105 #define FAITHMTU 1500
108 faithmodevent(mod, type, data)
116 if_clone_attach(&faith_cloner);
119 faithprefix_p = faithprefix;
125 faithprefix_p = NULL;
128 if_clone_detach(&faith_cloner);
136 static moduledata_t faith_mod = {
142 DECLARE_MODULE(if_faith, faith_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
143 MODULE_VERSION(if_faith, 1);
146 faith_clone_create(ifc, unit, params)
147 struct if_clone *ifc;
152 struct faith_softc *sc;
154 sc = malloc(sizeof(struct faith_softc), M_FAITH, M_WAITOK | M_ZERO);
155 ifp = sc->sc_ifp = if_alloc(IFT_FAITH);
162 if_initname(sc->sc_ifp, ifc->ifc_name, unit);
164 ifp->if_mtu = FAITHMTU;
165 /* Change to BROADCAST experimentaly to announce its prefix. */
166 ifp->if_flags = /* IFF_LOOPBACK */ IFF_BROADCAST | IFF_MULTICAST;
167 ifp->if_ioctl = faithioctl;
168 ifp->if_output = faithoutput;
171 ifp->if_snd.ifq_maxlen = ifqmaxlen;
173 bpfattach(ifp, DLT_NULL, sizeof(u_int32_t));
178 faith_clone_destroy(ifp)
181 struct faith_softc *sc = ifp->if_softc;
190 faithoutput(ifp, m, dst, ro)
193 struct sockaddr *dst;
198 struct rtentry *rt = NULL;
204 /* BPF writes need to be handled specially. */
205 if (dst->sa_family == AF_UNSPEC) {
206 bcopy(dst->sa_data, &af, sizeof(af));
210 if (bpf_peers_present(ifp->if_bpf)) {
212 bpf_mtap2(ifp->if_bpf, &af, sizeof(af), m);
215 if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) {
217 return (rt->rt_flags & RTF_BLACKHOLE ? 0 :
218 rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH);
221 ifp->if_obytes += m->m_pkthdr.len;
222 switch (dst->sa_family) {
238 /* XXX do we need more sanity checks? */
240 m->m_pkthdr.rcvif = ifp;
242 ifp->if_ibytes += m->m_pkthdr.len;
243 netisr_dispatch(isr, m);
249 faithrtrequest(cmd, rt, info)
252 struct rt_addrinfo *info;
255 rt->rt_rmx.rmx_mtu = rt->rt_ifp->if_mtu;
259 * Process an ioctl request.
263 faithioctl(ifp, cmd, data)
269 struct ifreq *ifr = (struct ifreq *)data;
275 ifp->if_flags |= IFF_UP;
276 ifp->if_drv_flags |= IFF_DRV_RUNNING;
277 ifa = (struct ifaddr *)data;
278 ifa->ifa_rtrequest = faithrtrequest;
280 * Everything else is done at a higher level.
287 error = EAFNOSUPPORT; /* XXX */
290 switch (ifr->ifr_addr.sa_family) {
301 error = EAFNOSUPPORT;
308 ifp->if_mtu = ifr->ifr_mtu;
324 * XXX could be layer violation to call sys/net from sys/netinet6
328 struct in6_addr *in6;
331 struct sockaddr_in6 sin6;
334 if (V_ip6_keepfaith == 0)
337 bzero(&sin6, sizeof(sin6));
338 sin6.sin6_family = AF_INET6;
339 sin6.sin6_len = sizeof(struct sockaddr_in6);
340 sin6.sin6_addr = *in6;
341 rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL);
342 if (rt && rt->rt_ifp && rt->rt_ifp->if_type == IFT_FAITH &&
343 (rt->rt_ifp->if_flags & IFF_UP) != 0)