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1.1 root 1: /*
2: * Copyright (c) 1982, 1986 Regents of the University of California.
3: * All rights reserved.
4: *
5: * Redistribution and use in source and binary forms, with or without
6: * modification, are permitted provided that the following conditions
7: * are met:
8: * 1. Redistributions of source code must retain the above copyright
9: * notice, this list of conditions and the following disclaimer.
10: * 2. Redistributions in binary form must reproduce the above copyright
11: * notice, this list of conditions and the following disclaimer in the
12: * documentation and/or other materials provided with the distribution.
13: * 3. All advertising materials mentioning features or use of this software
14: * must display the following acknowledgement:
15: * This product includes software developed by the University of
16: * California, Berkeley and its contributors.
17: * 4. Neither the name of the University nor the names of its contributors
18: * may be used to endorse or promote products derived from this software
19: * without specific prior written permission.
20: *
21: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31: * SUCH DAMAGE.
32: *
1.1.1.3 ! root 33: * from: @(#)if_loop.c 7.13 (Berkeley) 4/26/91
! 34: * if_loop.c,v 1.6 1993/06/27 06:02:27 andrew Exp
1.1 root 35: */
36:
37: /*
38: * Loopback interface driver for protocol testing and timing.
39: */
40:
41: #include "param.h"
42: #include "systm.h"
43: #include "mbuf.h"
44: #include "socket.h"
45: #include "errno.h"
46: #include "ioctl.h"
1.1.1.2 root 47: #include "protosw.h"
1.1 root 48:
1.1.1.3 ! root 49: #include "loop.h"
! 50:
1.1 root 51: #include "../net/if.h"
52: #include "../net/if_types.h"
53: #include "../net/netisr.h"
54: #include "../net/route.h"
55:
56: #include "machine/mtpr.h"
57:
58: #ifdef INET
59: #include "../netinet/in.h"
60: #include "../netinet/in_systm.h"
61: #include "../netinet/in_var.h"
62: #include "../netinet/ip.h"
63: #endif
64:
65: #ifdef NS
66: #include "../netns/ns.h"
67: #include "../netns/ns_if.h"
68: #endif
69:
70: #ifdef ISO
71: #include "../netiso/iso.h"
72: #include "../netiso/iso_var.h"
73: #endif
74:
1.1.1.2 root 75: #include "bpfilter.h"
76: #if NBPFILTER > 0
77: #include <sys/time.h>
78: #include <net/bpf.h>
79: static caddr_t lo_bpf;
80: #endif
81:
1.1 root 82: #define LOMTU (1024+512)
83:
1.1.1.3 ! root 84: struct ifnet loif[NLOOP];
1.1 root 85: int looutput(), loioctl();
86:
1.1.1.3 ! root 87: void
1.1 root 88: loattach()
89: {
1.1.1.3 ! root 90: register int i;
! 91: register struct ifnet *ifp;
1.1 root 92:
1.1.1.3 ! root 93: for (i = 0; i < NLOOP; i++)
! 94: {
! 95: ifp = &loif[i];
! 96: ifp->if_unit = i;
! 97: ifp->if_name = "lo";
! 98: ifp->if_mtu = LOMTU;
! 99: ifp->if_flags = IFF_LOOPBACK;
! 100: ifp->if_ioctl = loioctl;
! 101: ifp->if_output = looutput;
! 102: ifp->if_type = IFT_LOOP;
! 103: ifp->if_hdrlen = 0;
! 104: ifp->if_addrlen = 0;
! 105: if_attach(ifp);
1.1.1.2 root 106: #if NBPFILTER > 0
1.1.1.3 ! root 107: bpfattach(&lo_bpf, ifp, DLT_NULL, sizeof(u_int));
1.1.1.2 root 108: #endif
1.1.1.3 ! root 109: }
1.1 root 110: }
111:
112: looutput(ifp, m, dst, rt)
113: struct ifnet *ifp;
114: register struct mbuf *m;
115: struct sockaddr *dst;
116: register struct rtentry *rt;
117: {
118: int s, isr;
119: register struct ifqueue *ifq = 0;
120:
121: if ((m->m_flags & M_PKTHDR) == 0)
122: panic("looutput no HDR");
1.1.1.2 root 123: #if NBPFILTER > 0
124: if (lo_bpf) {
125: /*
126: * We need to prepend the address family as
127: * a four byte field. Cons up a dummy header
128: * to pacify bpf. This is safe because bpf
129: * will only read from the mbuf (i.e., it won't
130: * try to free it or keep a pointer to it).
131: */
132: struct mbuf m0;
133: u_int af = dst->sa_family;
134:
135: m0.m_next = m;
136: m0.m_len = 4;
137: m0.m_data = (char *)⁡
138:
139: bpf_mtap(lo_bpf, &m0);
140: }
141: #endif
1.1 root 142: m->m_pkthdr.rcvif = ifp;
143:
144: if (rt && rt->rt_flags & RTF_REJECT) {
145: m_freem(m);
146: return (rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH);
147: }
148: ifp->if_opackets++;
149: ifp->if_obytes += m->m_pkthdr.len;
150: switch (dst->sa_family) {
151:
152: #ifdef INET
153: case AF_INET:
154: ifq = &ipintrq;
155: isr = NETISR_IP;
156: break;
157: #endif
158: #ifdef NS
159: case AF_NS:
160: ifq = &nsintrq;
161: isr = NETISR_NS;
162: break;
163: #endif
164: #ifdef ISO
165: case AF_ISO:
166: ifq = &clnlintrq;
167: isr = NETISR_ISO;
168: break;
169: #endif
170: default:
171: printf("lo%d: can't handle af%d\n", ifp->if_unit,
172: dst->sa_family);
173: m_freem(m);
174: return (EAFNOSUPPORT);
175: }
176: s = splimp();
177: if (IF_QFULL(ifq)) {
178: IF_DROP(ifq);
179: m_freem(m);
180: splx(s);
181: return (ENOBUFS);
182: }
183: IF_ENQUEUE(ifq, m);
184: schednetisr(isr);
185: ifp->if_ipackets++;
186: ifp->if_ibytes += m->m_pkthdr.len;
187: splx(s);
188: return (0);
189: }
190:
191: /* ARGSUSED */
192: lortrequest(cmd, rt, sa)
193: struct rtentry *rt;
194: struct sockaddr *sa;
195: {
196: if (rt)
197: rt->rt_rmx.rmx_mtu = LOMTU;
198: }
199:
200: /*
201: * Process an ioctl request.
202: */
203: /* ARGSUSED */
204: loioctl(ifp, cmd, data)
205: register struct ifnet *ifp;
206: int cmd;
207: caddr_t data;
208: {
209: register struct ifaddr *ifa;
210: int error = 0;
211:
212: switch (cmd) {
213:
214: case SIOCSIFADDR:
215: ifp->if_flags |= IFF_UP;
216: ifa = (struct ifaddr *)data;
217: if (ifa != 0 && ifa->ifa_addr->sa_family == AF_ISO)
218: ifa->ifa_rtrequest = lortrequest;
219: /*
220: * Everything else is done at a higher level.
221: */
222: break;
223:
224: default:
225: error = EINVAL;
226: }
227: return (error);
228: }
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