1 /* $KAME: if_faith.c,v 1.23 2001/12/17 13:55:29 sumikawa Exp $ */
4 * Copyright (c) 1982, 1986, 1993
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17 * This product includes software developed by the University of
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35 * $FreeBSD: src/sys/net/if_faith.c,v 1.3.2.6 2002/04/28 05:40:25 suz Exp $
36 * $DragonFly: src/sys/net/faith/if_faith.c,v 1.18 2008/01/11 11:59:40 sephe Exp $
40 * @(#)if_loop.c 8.1 (Berkeley) 6/10/93
41 * Id: if_loop.c,v 1.22 1996/06/19 16:24:10 wollman Exp
45 * Loopback interface driver for protocol testing and timing.
48 #include "use_faith.h"
51 #include "opt_inet6.h"
53 #include <sys/param.h>
54 #include <sys/systm.h>
55 #include <sys/kernel.h>
58 #include <sys/socket.h>
59 #include <sys/errno.h>
60 #include <sys/sockio.h>
62 #include <sys/queue.h>
63 #include <sys/types.h>
64 #include <sys/malloc.h>
67 #include <net/if_types.h>
68 #include <net/netisr.h>
69 #include <net/route.h>
71 #include <net/if_clone.h>
74 #include <netinet/in.h>
75 #include <netinet/in_systm.h>
76 #include <netinet/in_var.h>
77 #include <netinet/ip.h>
82 #include <netinet/in.h>
84 #include <netinet6/in6_var.h>
85 #include <netinet/ip6.h>
86 #include <netinet6/ip6_var.h>
89 #include <net/net_osdep.h>
91 #define FAITHNAME "faith"
94 struct ifnet sc_if; /* must be first */
95 LIST_ENTRY(faith_softc) sc_list;
98 static int faithioctl (struct ifnet *, u_long, caddr_t, struct ucred *);
99 int faithoutput (struct ifnet *, struct mbuf *, struct sockaddr *,
101 static void faithrtrequest (int, struct rtentry *, struct rt_addrinfo *);
103 static int faithprefix (struct in6_addr *);
106 static int faithmodevent (module_t, int, void *);
108 static MALLOC_DEFINE(M_FAITH, FAITHNAME, "Firewall Assisted Tunnel Interface");
109 LIST_HEAD(, faith_softc) faith_softc_list;
111 int faith_clone_create (struct if_clone *, int, caddr_t);
112 int faith_clone_destroy (struct ifnet *);
114 struct if_clone faith_cloner = IF_CLONE_INITIALIZER(FAITHNAME,
115 faith_clone_create, faith_clone_destroy, NFAITH, IF_MAXUNIT);
117 #define FAITHMTU 1500
120 faithmodevent(module_t mod, int type, void *data)
125 LIST_INIT(&faith_softc_list);
126 if_clone_attach(&faith_cloner);
129 faithprefix_p = faithprefix;
135 faithprefix_p = NULL;
138 if_clone_detach(&faith_cloner);
140 while (!LIST_EMPTY(&faith_softc_list))
142 &LIST_FIRST(&faith_softc_list)->sc_if);
149 static moduledata_t faith_mod = {
155 DECLARE_MODULE(if_faith, faith_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
156 MODULE_VERSION(if_faith, 1);
159 faith_clone_create(struct if_clone *ifc, int unit, caddr_t param __unused)
161 struct faith_softc *sc;
163 sc = kmalloc(sizeof(struct faith_softc), M_FAITH, M_WAITOK | M_ZERO);
165 sc->sc_if.if_softc = sc;
166 if_initname(&(sc->sc_if), FAITHNAME, unit);
168 sc->sc_if.if_mtu = FAITHMTU;
169 /* Change to BROADCAST experimentaly to announce its prefix. */
170 sc->sc_if.if_flags = /* IFF_LOOPBACK */ IFF_BROADCAST | IFF_MULTICAST;
171 sc->sc_if.if_ioctl = faithioctl;
172 sc->sc_if.if_output = faithoutput;
173 sc->sc_if.if_type = IFT_FAITH;
174 sc->sc_if.if_hdrlen = 0;
175 sc->sc_if.if_addrlen = 0;
176 sc->sc_if.if_snd.ifq_maxlen = ifqmaxlen;
177 if_attach(&sc->sc_if, NULL);
178 bpfattach(&sc->sc_if, DLT_NULL, sizeof(u_int));
179 LIST_INSERT_HEAD(&faith_softc_list, sc, sc_list);
184 faith_clone_destroy(struct ifnet *ifp)
186 struct faith_softc *sc = (struct faith_softc *) ifp;
188 LIST_REMOVE(sc, sc_list);
198 faithoutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
203 if ((m->m_flags & M_PKTHDR) == 0)
204 panic("faithoutput no HDR");
206 /* BPF write needs to be handled specially */
207 if (dst->sa_family == AF_UNSPEC) {
208 dst->sa_family = *(mtod(m, int *));
209 m->m_len -= sizeof(int);
210 m->m_pkthdr.len -= sizeof(int);
211 m->m_data += sizeof(int);
214 if (ifp->if_bpf != NULL) {
216 * We need to prepend the address family as
219 uint32_t af = dst->sa_family;
221 bpf_ptap(ifp->if_bpf, m, &af, sizeof(af));
224 if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) {
226 return (rt->rt_flags & RTF_BLACKHOLE ? 0 :
227 rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH);
230 ifp->if_obytes += m->m_pkthdr.len;
231 switch (dst->sa_family) {
247 /* XXX do we need more sanity checks? */
249 m->m_pkthdr.rcvif = ifp;
250 m->m_flags &= ~M_HASH;
252 ifp->if_ibytes += m->m_pkthdr.len;
253 netisr_queue(isr, m);
259 faithrtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info)
262 rt->rt_rmx.rmx_mtu = rt->rt_ifp->if_mtu; /* for ISO */
264 * For optimal performance, the send and receive buffers
265 * should be at least twice the MTU plus a little more for
268 rt->rt_rmx.rmx_recvpipe =
269 rt->rt_rmx.rmx_sendpipe = 3 * FAITHMTU;
274 * Process an ioctl request.
278 faithioctl(struct ifnet *ifp, u_long cmd, caddr_t data, struct ucred *cr)
281 struct ifreq *ifr = (struct ifreq *)data;
287 ifp->if_flags |= IFF_UP | IFF_RUNNING;
288 ifa = (struct ifaddr *)data;
289 ifa->ifa_rtrequest = faithrtrequest;
291 * Everything else is done at a higher level.
298 error = EAFNOSUPPORT; /* XXX */
301 switch (ifr->ifr_addr.sa_family) {
312 error = EAFNOSUPPORT;
319 ifp->if_mtu = ifr->ifr_mtu;
335 * XXX could be layer violation to call sys/net from sys/netinet6
338 faithprefix(struct in6_addr *in6)
341 struct sockaddr_in6 sin6;
344 if (ip6_keepfaith == 0)
347 bzero(&sin6, sizeof sin6);
348 sin6.sin6_family = AF_INET6;
349 sin6.sin6_len = sizeof(struct sockaddr_in6);
350 sin6.sin6_addr = *in6;
351 rt = rtpurelookup((struct sockaddr *)&sin6);
352 if (rt != NULL && rt->rt_ifp && rt->rt_ifp->if_type == IFT_FAITH &&
353 (rt->rt_ifp->if_flags & IFF_UP))