Annotation of sys/net/if_faith.c, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: if_faith.c,v 1.22 2006/03/25 22:41:47 djm Exp $ */
2: /*
3: * Copyright (c) 1982, 1986, 1993
4: * The Regents of the University of California. All rights reserved.
5: *
6: * Redistribution and use in source and binary forms, with or without
7: * modification, are permitted provided that the following conditions
8: * are met:
9: * 1. Redistributions of source code must retain the above copyright
10: * notice, this list of conditions and the following disclaimer.
11: * 2. Redistributions in binary form must reproduce the above copyright
12: * notice, this list of conditions and the following disclaimer in the
13: * documentation and/or other materials provided with the distribution.
14: * 3. Neither the name of the University nor the names of its contributors
15: * may be used to endorse or promote products derived from this software
16: * without specific prior written permission.
17: *
18: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
19: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
22: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28: * SUCH DAMAGE.
29: */
30: /*
31: * derived from
32: * @(#)if_loop.c 8.1 (Berkeley) 6/10/93
33: * Id: if_loop.c,v 1.22 1996/06/19 16:24:10 wollman Exp
34: */
35:
36: /*
37: * Loopback interface driver for protocol testing and timing.
38: */
39: #include "faith.h"
40:
41: #if NFAITH > 0
42:
43: #include <sys/param.h>
44: #include <sys/systm.h>
45: #include <sys/mbuf.h>
46: #include <sys/socket.h>
47: #include <sys/ioctl.h>
48:
49: #include <net/if.h>
50: #include <net/if_types.h>
51: #include <net/netisr.h>
52: #include <net/route.h>
53: #include <net/bpf.h>
54:
55: #ifdef INET
56: #include <netinet/in.h>
57: #include <netinet/in_var.h>
58: #endif
59:
60: #ifdef INET6
61: #ifndef INET
62: #include <netinet/in.h>
63: #endif
64: #include <netinet6/in6_var.h>
65: #endif
66:
67: #include "bpfilter.h"
68:
69: static int faithioctl(struct ifnet *, u_long, caddr_t);
70: int faithoutput(struct ifnet *, struct mbuf *, struct sockaddr *,
71: struct rtentry *);
72: static void faithrtrequest(int, struct rtentry *, struct rt_addrinfo *);
73:
74: void faithattach(int);
75: int faith_clone_create(struct if_clone *, int);
76: int faith_clone_destroy(struct ifnet *ifp);
77:
78: struct if_clone faith_cloner =
79: IF_CLONE_INITIALIZER("faith", faith_clone_create, faith_clone_destroy);
80:
81: #define FAITHMTU 1500
82:
83: /* ARGSUSED */
84: void
85: faithattach(faith)
86: int faith;
87: {
88: if_clone_attach(&faith_cloner);
89: }
90:
91: int
92: faith_clone_create(ifc, unit)
93: struct if_clone *ifc;
94: int unit;
95: {
96: struct ifnet *ifp;
97:
98: ifp = malloc(sizeof(*ifp), M_DEVBUF, M_NOWAIT);
99: if (!ifp)
100: return (ENOMEM);
101: bzero(ifp, sizeof(*ifp));
102: snprintf(ifp->if_xname, sizeof ifp->if_xname, "%s%d", ifc->ifc_name,
103: unit);
104: ifp->if_mtu = FAITHMTU;
105: /* Change to BROADCAST experimentaly to announce its prefix. */
106: ifp->if_flags = /* IFF_LOOPBACK */ IFF_BROADCAST | IFF_MULTICAST;
107: ifp->if_ioctl = faithioctl;
108: ifp->if_output = faithoutput;
109: ifp->if_type = IFT_FAITH;
110: ifp->if_hdrlen = 0;
111: ifp->if_addrlen = 0;
112: if_attach(ifp);
113: if_alloc_sadl(ifp);
114: #if NBPFILTER > 0
115: bpfattach(&ifp->if_bpf, ifp, DLT_NULL, sizeof(u_int));
116: #endif
117: return (0);
118: }
119:
120: int
121: faith_clone_destroy(ifp)
122: struct ifnet *ifp;
123: {
124: if_detach(ifp);
125:
126: free(ifp, M_DEVBUF);
127: return (0);
128: }
129:
130: int
131: faithoutput(ifp, m, dst, rt)
132: struct ifnet *ifp;
133: struct mbuf *m;
134: struct sockaddr *dst;
135: struct rtentry *rt;
136: {
137: int s, isr;
138: struct ifqueue *ifq = 0;
139:
140: if ((m->m_flags & M_PKTHDR) == 0)
141: panic("faithoutput no HDR");
142: #if NBPFILTER > 0
143: /* BPF write needs to be handled specially */
144: if (dst->sa_family == AF_UNSPEC) {
145: dst->sa_family = *(mtod(m, int *));
146: m->m_len -= sizeof(int);
147: m->m_pkthdr.len -= sizeof(int);
148: m->m_data += sizeof(int);
149: }
150:
151: if (ifp->if_bpf)
152: bpf_mtap_af(ifp->if_bpf, dst->sa_family, m, BPF_DIRECTION_OUT);
153: #endif
154:
155: if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) {
156: m_freem(m);
157: return (rt->rt_flags & RTF_BLACKHOLE ? 0 :
158: rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH);
159: }
160: ifp->if_opackets++;
161: ifp->if_obytes += m->m_pkthdr.len;
162: switch (dst->sa_family) {
163: #ifdef INET
164: case AF_INET:
165: ifq = &ipintrq;
166: isr = NETISR_IP;
167: break;
168: #endif
169: #ifdef INET6
170: case AF_INET6:
171: ifq = &ip6intrq;
172: isr = NETISR_IPV6;
173: break;
174: #endif
175: default:
176: m_freem(m);
177: return EAFNOSUPPORT;
178: }
179:
180: /* XXX do we need more sanity checks? */
181:
182: m->m_pkthdr.rcvif = ifp;
183: s = splnet();
184: if (IF_QFULL(ifq)) {
185: IF_DROP(ifq);
186: m_freem(m);
187: splx(s);
188: return (ENOBUFS);
189: }
190: IF_ENQUEUE(ifq, m);
191: schednetisr(isr);
192: ifp->if_ipackets++;
193: ifp->if_ibytes += m->m_pkthdr.len;
194: splx(s);
195: return (0);
196: }
197:
198: /* ARGSUSED */
199: static void
200: faithrtrequest(cmd, rt, info)
201: int cmd;
202: struct rtentry *rt;
203: struct rt_addrinfo *info;
204: {
205: if (rt)
206: rt->rt_rmx.rmx_mtu = rt->rt_ifp->if_mtu; /* for ISO */
207: }
208:
209: /*
210: * Process an ioctl request.
211: */
212: /* ARGSUSED */
213: static int
214: faithioctl(ifp, cmd, data)
215: struct ifnet *ifp;
216: u_long cmd;
217: caddr_t data;
218: {
219: struct ifaddr *ifa;
220: struct ifreq *ifr = (struct ifreq *)data;
221: int error = 0;
222:
223: switch (cmd) {
224:
225: case SIOCSIFADDR:
226: ifp->if_flags |= IFF_UP | IFF_RUNNING;
227: ifa = (struct ifaddr *)data;
228: ifa->ifa_rtrequest = faithrtrequest;
229: /*
230: * Everything else is done at a higher level.
231: */
232: break;
233:
234: case SIOCADDMULTI:
235: case SIOCDELMULTI:
236: if (ifr == 0) {
237: error = EAFNOSUPPORT; /* XXX */
238: break;
239: }
240: switch (ifr->ifr_addr.sa_family) {
241: #ifdef INET
242: case AF_INET:
243: break;
244: #endif
245: #ifdef INET6
246: case AF_INET6:
247: break;
248: #endif
249:
250: default:
251: error = EAFNOSUPPORT;
252: break;
253: }
254: break;
255:
256: case SIOCSIFFLAGS:
257: break;
258:
259: default:
260: error = EINVAL;
261: }
262: return (error);
263: }
264: #endif /* NFAITH > 0 */
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