1/*-
2 * Copyright (c) 1982, 1986, 1993
3 * The Regents of the University of California. 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 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * @(#)if_loop.c 8.2 (Berkeley) 1/9/95
| 1/*-
2 * Copyright (c) 1982, 1986, 1993
3 * The Regents of the University of California. 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 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * @(#)if_loop.c 8.2 (Berkeley) 1/9/95
|
31 */
32
33/*
34 * Loopback interface driver for protocol testing and timing.
35 */
36
37#include "opt_atalk.h"
38#include "opt_inet.h"
39#include "opt_inet6.h"
40#include "opt_ipx.h"
41
42#include <sys/param.h>
43#include <sys/systm.h>
44#include <sys/kernel.h>
45#include <sys/mbuf.h>
46#include <sys/module.h>
47#include <machine/bus.h>
48#include <sys/rman.h>
49#include <sys/socket.h>
50#include <sys/sockio.h>
51#include <sys/sysctl.h>
52
53#include <net/if.h>
54#include <net/if_clone.h>
55#include <net/if_types.h>
56#include <net/netisr.h>
57#include <net/route.h>
58#include <net/bpf.h>
59#include <net/vnet.h>
60
61#ifdef INET
62#include <netinet/in.h>
63#include <netinet/in_var.h>
64#endif
65
66#ifdef IPX
67#include <netipx/ipx.h>
68#include <netipx/ipx_if.h>
69#endif
70
71#ifdef INET6
72#ifndef INET
73#include <netinet/in.h>
74#endif
75#include <netinet6/in6_var.h>
76#include <netinet/ip6.h>
77#endif
78
79#ifdef NETATALK
80#include <netatalk/at.h>
81#include <netatalk/at_var.h>
82#endif
83
84#include <security/mac/mac_framework.h>
85
86#ifdef TINY_LOMTU
87#define LOMTU (1024+512)
88#elif defined(LARGE_LOMTU)
89#define LOMTU 131072
90#else
91#define LOMTU 16384
92#endif
93
94#define LO_CSUM_FEATURES (CSUM_IP | CSUM_TCP | CSUM_UDP | CSUM_SCTP)
95#define LO_CSUM_SET (CSUM_DATA_VALID | CSUM_PSEUDO_HDR | \
96 CSUM_IP_CHECKED | CSUM_IP_VALID | \
97 CSUM_SCTP_VALID)
98
99int loioctl(struct ifnet *, u_long, caddr_t);
100static void lortrequest(int, struct rtentry *, struct rt_addrinfo *);
101int looutput(struct ifnet *ifp, struct mbuf *m,
102 struct sockaddr *dst, struct route *ro);
103static int lo_clone_create(struct if_clone *, int, caddr_t);
104static void lo_clone_destroy(struct ifnet *);
105
106VNET_DEFINE(struct ifnet *, loif); /* Used externally */
107
108#ifdef VIMAGE
| 31 */
32
33/*
34 * Loopback interface driver for protocol testing and timing.
35 */
36
37#include "opt_atalk.h"
38#include "opt_inet.h"
39#include "opt_inet6.h"
40#include "opt_ipx.h"
41
42#include <sys/param.h>
43#include <sys/systm.h>
44#include <sys/kernel.h>
45#include <sys/mbuf.h>
46#include <sys/module.h>
47#include <machine/bus.h>
48#include <sys/rman.h>
49#include <sys/socket.h>
50#include <sys/sockio.h>
51#include <sys/sysctl.h>
52
53#include <net/if.h>
54#include <net/if_clone.h>
55#include <net/if_types.h>
56#include <net/netisr.h>
57#include <net/route.h>
58#include <net/bpf.h>
59#include <net/vnet.h>
60
61#ifdef INET
62#include <netinet/in.h>
63#include <netinet/in_var.h>
64#endif
65
66#ifdef IPX
67#include <netipx/ipx.h>
68#include <netipx/ipx_if.h>
69#endif
70
71#ifdef INET6
72#ifndef INET
73#include <netinet/in.h>
74#endif
75#include <netinet6/in6_var.h>
76#include <netinet/ip6.h>
77#endif
78
79#ifdef NETATALK
80#include <netatalk/at.h>
81#include <netatalk/at_var.h>
82#endif
83
84#include <security/mac/mac_framework.h>
85
86#ifdef TINY_LOMTU
87#define LOMTU (1024+512)
88#elif defined(LARGE_LOMTU)
89#define LOMTU 131072
90#else
91#define LOMTU 16384
92#endif
93
94#define LO_CSUM_FEATURES (CSUM_IP | CSUM_TCP | CSUM_UDP | CSUM_SCTP)
95#define LO_CSUM_SET (CSUM_DATA_VALID | CSUM_PSEUDO_HDR | \
96 CSUM_IP_CHECKED | CSUM_IP_VALID | \
97 CSUM_SCTP_VALID)
98
99int loioctl(struct ifnet *, u_long, caddr_t);
100static void lortrequest(int, struct rtentry *, struct rt_addrinfo *);
101int looutput(struct ifnet *ifp, struct mbuf *m,
102 struct sockaddr *dst, struct route *ro);
103static int lo_clone_create(struct if_clone *, int, caddr_t);
104static void lo_clone_destroy(struct ifnet *);
105
106VNET_DEFINE(struct ifnet *, loif); /* Used externally */
107
108#ifdef VIMAGE
|
111#define V_lo_cloner_data VNET(lo_cloner_data)
112#define V_lo_cloner VNET(lo_cloner)
113#endif
114
115IFC_SIMPLE_DECLARE(lo, 1);
116
117static void
118lo_clone_destroy(struct ifnet *ifp)
119{
120
121#ifndef VIMAGE
122 /* XXX: destroying lo0 will lead to panics. */
123 KASSERT(V_loif != ifp, ("%s: destroying lo0", __func__));
124#endif
125
126 bpfdetach(ifp);
127 if_detach(ifp);
128 if_free(ifp);
129}
130
131static int
132lo_clone_create(struct if_clone *ifc, int unit, caddr_t params)
133{
134 struct ifnet *ifp;
135
136 ifp = if_alloc(IFT_LOOP);
137 if (ifp == NULL)
138 return (ENOSPC);
139
140 if_initname(ifp, ifc->ifc_name, unit);
141 ifp->if_mtu = LOMTU;
142 ifp->if_flags = IFF_LOOPBACK | IFF_MULTICAST;
143 ifp->if_ioctl = loioctl;
144 ifp->if_output = looutput;
145 ifp->if_snd.ifq_maxlen = ifqmaxlen;
146 ifp->if_capabilities = ifp->if_capenable = IFCAP_HWCSUM;
147 ifp->if_hwassist = LO_CSUM_FEATURES;
148 if_attach(ifp);
149 bpfattach(ifp, DLT_NULL, sizeof(u_int32_t));
150 if (V_loif == NULL)
151 V_loif = ifp;
152
153 return (0);
154}
155
156static void
157vnet_loif_init(const void *unused __unused)
158{
159
160#ifdef VIMAGE
161 V_lo_cloner = lo_cloner;
162 V_lo_cloner_data = lo_cloner_data;
163 V_lo_cloner.ifc_data = &V_lo_cloner_data;
164 if_clone_attach(&V_lo_cloner);
165#else
166 if_clone_attach(&lo_cloner);
167#endif
168}
169VNET_SYSINIT(vnet_loif_init, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY,
170 vnet_loif_init, NULL);
171
172#ifdef VIMAGE
173static void
174vnet_loif_uninit(const void *unused __unused)
175{
176
177 if_clone_detach(&V_lo_cloner);
178 V_loif = NULL;
179}
180VNET_SYSUNINIT(vnet_loif_uninit, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY,
181 vnet_loif_uninit, NULL);
182#endif
183
184static int
185loop_modevent(module_t mod, int type, void *data)
186{
187
188 switch (type) {
189 case MOD_LOAD:
190 break;
191
192 case MOD_UNLOAD:
193 printf("loop module unload - not possible for this module type\n");
194 return (EINVAL);
195
196 default:
197 return (EOPNOTSUPP);
198 }
199 return (0);
200}
201
202static moduledata_t loop_mod = {
203 "if_lo",
204 loop_modevent,
205 0
206};
207
208DECLARE_MODULE(if_lo, loop_mod, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY);
209
210int
211looutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
212 struct route *ro)
213{
214 u_int32_t af;
215 struct rtentry *rt = NULL;
216#ifdef MAC
217 int error;
218#endif
219
220 M_ASSERTPKTHDR(m); /* check if we have the packet header */
221
222 if (ro != NULL)
223 rt = ro->ro_rt;
224#ifdef MAC
225 error = mac_ifnet_check_transmit(ifp, m);
226 if (error) {
227 m_freem(m);
228 return (error);
229 }
230#endif
231
232 if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) {
233 m_freem(m);
234 return (rt->rt_flags & RTF_BLACKHOLE ? 0 :
235 rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH);
236 }
237
238 ifp->if_opackets++;
239 ifp->if_obytes += m->m_pkthdr.len;
240
241 /* BPF writes need to be handled specially. */
242 if (dst->sa_family == AF_UNSPEC) {
243 bcopy(dst->sa_data, &af, sizeof(af));
244 dst->sa_family = af;
245 }
246
247#if 1 /* XXX */
248 switch (dst->sa_family) {
249 case AF_INET:
250 if (ifp->if_capenable & IFCAP_RXCSUM) {
251 m->m_pkthdr.csum_data = 0xffff;
252 m->m_pkthdr.csum_flags = LO_CSUM_SET;
253 }
254 m->m_pkthdr.csum_flags &= ~LO_CSUM_FEATURES;
255 case AF_INET6:
256 case AF_IPX:
257 case AF_APPLETALK:
258 break;
259 default:
260 printf("looutput: af=%d unexpected\n", dst->sa_family);
261 m_freem(m);
262 return (EAFNOSUPPORT);
263 }
264#endif
265 return (if_simloop(ifp, m, dst->sa_family, 0));
266}
267
268/*
269 * if_simloop()
270 *
271 * This function is to support software emulation of hardware loopback,
272 * i.e., for interfaces with the IFF_SIMPLEX attribute. Since they can't
273 * hear their own broadcasts, we create a copy of the packet that we
274 * would normally receive via a hardware loopback.
275 *
276 * This function expects the packet to include the media header of length hlen.
277 */
278int
279if_simloop(struct ifnet *ifp, struct mbuf *m, int af, int hlen)
280{
281 int isr;
282
283 M_ASSERTPKTHDR(m);
284 m_tag_delete_nonpersistent(m);
285 m->m_pkthdr.rcvif = ifp;
286
287#ifdef MAC
288 mac_ifnet_create_mbuf(ifp, m);
289#endif
290
291 /*
292 * Let BPF see incoming packet in the following manner:
293 * - Emulated packet loopback for a simplex interface
294 * (net/if_ethersubr.c)
295 * -> passes it to ifp's BPF
296 * - IPv4/v6 multicast packet loopback (netinet(6)/ip(6)_output.c)
297 * -> not passes it to any BPF
298 * - Normal packet loopback from myself to myself (net/if_loop.c)
299 * -> passes to lo0's BPF (even in case of IPv6, where ifp!=lo0)
300 */
301 if (hlen > 0) {
302 if (bpf_peers_present(ifp->if_bpf)) {
303 bpf_mtap(ifp->if_bpf, m);
304 }
305 } else {
306 if (bpf_peers_present(V_loif->if_bpf)) {
307 if ((m->m_flags & M_MCAST) == 0 || V_loif == ifp) {
308 /* XXX beware sizeof(af) != 4 */
309 u_int32_t af1 = af;
310
311 /*
312 * We need to prepend the address family.
313 */
314 bpf_mtap2(V_loif->if_bpf, &af1, sizeof(af1), m);
315 }
316 }
317 }
318
319 /* Strip away media header */
320 if (hlen > 0) {
321 m_adj(m, hlen);
322#ifndef __NO_STRICT_ALIGNMENT
323 /*
324 * Some archs do not like unaligned data, so
325 * we move data down in the first mbuf.
326 */
327 if (mtod(m, vm_offset_t) & 3) {
328 KASSERT(hlen >= 3, ("if_simloop: hlen too small"));
329 bcopy(m->m_data,
330 (char *)(mtod(m, vm_offset_t)
331 - (mtod(m, vm_offset_t) & 3)),
332 m->m_len);
333 m->m_data -= (mtod(m,vm_offset_t) & 3);
334 }
335#endif
336 }
337
338 /* Deliver to upper layer protocol */
339 switch (af) {
340#ifdef INET
341 case AF_INET:
342 isr = NETISR_IP;
343 break;
344#endif
345#ifdef INET6
346 case AF_INET6:
347 m->m_flags |= M_LOOP;
348 isr = NETISR_IPV6;
349 break;
350#endif
351#ifdef IPX
352 case AF_IPX:
353 isr = NETISR_IPX;
354 break;
355#endif
356#ifdef NETATALK
357 case AF_APPLETALK:
358 isr = NETISR_ATALK2;
359 break;
360#endif
361 default:
362 printf("if_simloop: can't handle af=%d\n", af);
363 m_freem(m);
364 return (EAFNOSUPPORT);
365 }
366 ifp->if_ipackets++;
367 ifp->if_ibytes += m->m_pkthdr.len;
368 netisr_queue(isr, m); /* mbuf is free'd on failure. */
369 return (0);
370}
371
372/* ARGSUSED */
373static void
374lortrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info)
375{
376
377 RT_LOCK_ASSERT(rt);
378 rt->rt_rmx.rmx_mtu = rt->rt_ifp->if_mtu;
379}
380
381/*
382 * Process an ioctl request.
383 */
384/* ARGSUSED */
385int
386loioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
387{
388 struct ifaddr *ifa;
389 struct ifreq *ifr = (struct ifreq *)data;
390 int error = 0, mask;
391
392 switch (cmd) {
393 case SIOCSIFADDR:
394 ifp->if_flags |= IFF_UP;
395 ifp->if_drv_flags |= IFF_DRV_RUNNING;
396 ifa = (struct ifaddr *)data;
397 ifa->ifa_rtrequest = lortrequest;
398 /*
399 * Everything else is done at a higher level.
400 */
401 break;
402
403 case SIOCADDMULTI:
404 case SIOCDELMULTI:
405 if (ifr == 0) {
406 error = EAFNOSUPPORT; /* XXX */
407 break;
408 }
409 switch (ifr->ifr_addr.sa_family) {
410
411#ifdef INET
412 case AF_INET:
413 break;
414#endif
415#ifdef INET6
416 case AF_INET6:
417 break;
418#endif
419
420 default:
421 error = EAFNOSUPPORT;
422 break;
423 }
424 break;
425
426 case SIOCSIFMTU:
427 ifp->if_mtu = ifr->ifr_mtu;
428 break;
429
430 case SIOCSIFFLAGS:
431 break;
432
433 case SIOCSIFCAP:
434 mask = ifp->if_capenable ^ ifr->ifr_reqcap;
435 if ((mask & IFCAP_RXCSUM) != 0)
436 ifp->if_capenable ^= IFCAP_RXCSUM;
437 if ((mask & IFCAP_TXCSUM) != 0)
438 ifp->if_capenable ^= IFCAP_TXCSUM;
439 if (ifp->if_capenable & IFCAP_TXCSUM)
440 ifp->if_hwassist = LO_CSUM_FEATURES;
441 else
442 ifp->if_hwassist = 0;
443 break;
444
445 default:
446 error = EINVAL;
447 }
448 return (error);
449}
| 111#define V_lo_cloner_data VNET(lo_cloner_data)
112#define V_lo_cloner VNET(lo_cloner)
113#endif
114
115IFC_SIMPLE_DECLARE(lo, 1);
116
117static void
118lo_clone_destroy(struct ifnet *ifp)
119{
120
121#ifndef VIMAGE
122 /* XXX: destroying lo0 will lead to panics. */
123 KASSERT(V_loif != ifp, ("%s: destroying lo0", __func__));
124#endif
125
126 bpfdetach(ifp);
127 if_detach(ifp);
128 if_free(ifp);
129}
130
131static int
132lo_clone_create(struct if_clone *ifc, int unit, caddr_t params)
133{
134 struct ifnet *ifp;
135
136 ifp = if_alloc(IFT_LOOP);
137 if (ifp == NULL)
138 return (ENOSPC);
139
140 if_initname(ifp, ifc->ifc_name, unit);
141 ifp->if_mtu = LOMTU;
142 ifp->if_flags = IFF_LOOPBACK | IFF_MULTICAST;
143 ifp->if_ioctl = loioctl;
144 ifp->if_output = looutput;
145 ifp->if_snd.ifq_maxlen = ifqmaxlen;
146 ifp->if_capabilities = ifp->if_capenable = IFCAP_HWCSUM;
147 ifp->if_hwassist = LO_CSUM_FEATURES;
148 if_attach(ifp);
149 bpfattach(ifp, DLT_NULL, sizeof(u_int32_t));
150 if (V_loif == NULL)
151 V_loif = ifp;
152
153 return (0);
154}
155
156static void
157vnet_loif_init(const void *unused __unused)
158{
159
160#ifdef VIMAGE
161 V_lo_cloner = lo_cloner;
162 V_lo_cloner_data = lo_cloner_data;
163 V_lo_cloner.ifc_data = &V_lo_cloner_data;
164 if_clone_attach(&V_lo_cloner);
165#else
166 if_clone_attach(&lo_cloner);
167#endif
168}
169VNET_SYSINIT(vnet_loif_init, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY,
170 vnet_loif_init, NULL);
171
172#ifdef VIMAGE
173static void
174vnet_loif_uninit(const void *unused __unused)
175{
176
177 if_clone_detach(&V_lo_cloner);
178 V_loif = NULL;
179}
180VNET_SYSUNINIT(vnet_loif_uninit, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY,
181 vnet_loif_uninit, NULL);
182#endif
183
184static int
185loop_modevent(module_t mod, int type, void *data)
186{
187
188 switch (type) {
189 case MOD_LOAD:
190 break;
191
192 case MOD_UNLOAD:
193 printf("loop module unload - not possible for this module type\n");
194 return (EINVAL);
195
196 default:
197 return (EOPNOTSUPP);
198 }
199 return (0);
200}
201
202static moduledata_t loop_mod = {
203 "if_lo",
204 loop_modevent,
205 0
206};
207
208DECLARE_MODULE(if_lo, loop_mod, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY);
209
210int
211looutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
212 struct route *ro)
213{
214 u_int32_t af;
215 struct rtentry *rt = NULL;
216#ifdef MAC
217 int error;
218#endif
219
220 M_ASSERTPKTHDR(m); /* check if we have the packet header */
221
222 if (ro != NULL)
223 rt = ro->ro_rt;
224#ifdef MAC
225 error = mac_ifnet_check_transmit(ifp, m);
226 if (error) {
227 m_freem(m);
228 return (error);
229 }
230#endif
231
232 if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) {
233 m_freem(m);
234 return (rt->rt_flags & RTF_BLACKHOLE ? 0 :
235 rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH);
236 }
237
238 ifp->if_opackets++;
239 ifp->if_obytes += m->m_pkthdr.len;
240
241 /* BPF writes need to be handled specially. */
242 if (dst->sa_family == AF_UNSPEC) {
243 bcopy(dst->sa_data, &af, sizeof(af));
244 dst->sa_family = af;
245 }
246
247#if 1 /* XXX */
248 switch (dst->sa_family) {
249 case AF_INET:
250 if (ifp->if_capenable & IFCAP_RXCSUM) {
251 m->m_pkthdr.csum_data = 0xffff;
252 m->m_pkthdr.csum_flags = LO_CSUM_SET;
253 }
254 m->m_pkthdr.csum_flags &= ~LO_CSUM_FEATURES;
255 case AF_INET6:
256 case AF_IPX:
257 case AF_APPLETALK:
258 break;
259 default:
260 printf("looutput: af=%d unexpected\n", dst->sa_family);
261 m_freem(m);
262 return (EAFNOSUPPORT);
263 }
264#endif
265 return (if_simloop(ifp, m, dst->sa_family, 0));
266}
267
268/*
269 * if_simloop()
270 *
271 * This function is to support software emulation of hardware loopback,
272 * i.e., for interfaces with the IFF_SIMPLEX attribute. Since they can't
273 * hear their own broadcasts, we create a copy of the packet that we
274 * would normally receive via a hardware loopback.
275 *
276 * This function expects the packet to include the media header of length hlen.
277 */
278int
279if_simloop(struct ifnet *ifp, struct mbuf *m, int af, int hlen)
280{
281 int isr;
282
283 M_ASSERTPKTHDR(m);
284 m_tag_delete_nonpersistent(m);
285 m->m_pkthdr.rcvif = ifp;
286
287#ifdef MAC
288 mac_ifnet_create_mbuf(ifp, m);
289#endif
290
291 /*
292 * Let BPF see incoming packet in the following manner:
293 * - Emulated packet loopback for a simplex interface
294 * (net/if_ethersubr.c)
295 * -> passes it to ifp's BPF
296 * - IPv4/v6 multicast packet loopback (netinet(6)/ip(6)_output.c)
297 * -> not passes it to any BPF
298 * - Normal packet loopback from myself to myself (net/if_loop.c)
299 * -> passes to lo0's BPF (even in case of IPv6, where ifp!=lo0)
300 */
301 if (hlen > 0) {
302 if (bpf_peers_present(ifp->if_bpf)) {
303 bpf_mtap(ifp->if_bpf, m);
304 }
305 } else {
306 if (bpf_peers_present(V_loif->if_bpf)) {
307 if ((m->m_flags & M_MCAST) == 0 || V_loif == ifp) {
308 /* XXX beware sizeof(af) != 4 */
309 u_int32_t af1 = af;
310
311 /*
312 * We need to prepend the address family.
313 */
314 bpf_mtap2(V_loif->if_bpf, &af1, sizeof(af1), m);
315 }
316 }
317 }
318
319 /* Strip away media header */
320 if (hlen > 0) {
321 m_adj(m, hlen);
322#ifndef __NO_STRICT_ALIGNMENT
323 /*
324 * Some archs do not like unaligned data, so
325 * we move data down in the first mbuf.
326 */
327 if (mtod(m, vm_offset_t) & 3) {
328 KASSERT(hlen >= 3, ("if_simloop: hlen too small"));
329 bcopy(m->m_data,
330 (char *)(mtod(m, vm_offset_t)
331 - (mtod(m, vm_offset_t) & 3)),
332 m->m_len);
333 m->m_data -= (mtod(m,vm_offset_t) & 3);
334 }
335#endif
336 }
337
338 /* Deliver to upper layer protocol */
339 switch (af) {
340#ifdef INET
341 case AF_INET:
342 isr = NETISR_IP;
343 break;
344#endif
345#ifdef INET6
346 case AF_INET6:
347 m->m_flags |= M_LOOP;
348 isr = NETISR_IPV6;
349 break;
350#endif
351#ifdef IPX
352 case AF_IPX:
353 isr = NETISR_IPX;
354 break;
355#endif
356#ifdef NETATALK
357 case AF_APPLETALK:
358 isr = NETISR_ATALK2;
359 break;
360#endif
361 default:
362 printf("if_simloop: can't handle af=%d\n", af);
363 m_freem(m);
364 return (EAFNOSUPPORT);
365 }
366 ifp->if_ipackets++;
367 ifp->if_ibytes += m->m_pkthdr.len;
368 netisr_queue(isr, m); /* mbuf is free'd on failure. */
369 return (0);
370}
371
372/* ARGSUSED */
373static void
374lortrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info)
375{
376
377 RT_LOCK_ASSERT(rt);
378 rt->rt_rmx.rmx_mtu = rt->rt_ifp->if_mtu;
379}
380
381/*
382 * Process an ioctl request.
383 */
384/* ARGSUSED */
385int
386loioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
387{
388 struct ifaddr *ifa;
389 struct ifreq *ifr = (struct ifreq *)data;
390 int error = 0, mask;
391
392 switch (cmd) {
393 case SIOCSIFADDR:
394 ifp->if_flags |= IFF_UP;
395 ifp->if_drv_flags |= IFF_DRV_RUNNING;
396 ifa = (struct ifaddr *)data;
397 ifa->ifa_rtrequest = lortrequest;
398 /*
399 * Everything else is done at a higher level.
400 */
401 break;
402
403 case SIOCADDMULTI:
404 case SIOCDELMULTI:
405 if (ifr == 0) {
406 error = EAFNOSUPPORT; /* XXX */
407 break;
408 }
409 switch (ifr->ifr_addr.sa_family) {
410
411#ifdef INET
412 case AF_INET:
413 break;
414#endif
415#ifdef INET6
416 case AF_INET6:
417 break;
418#endif
419
420 default:
421 error = EAFNOSUPPORT;
422 break;
423 }
424 break;
425
426 case SIOCSIFMTU:
427 ifp->if_mtu = ifr->ifr_mtu;
428 break;
429
430 case SIOCSIFFLAGS:
431 break;
432
433 case SIOCSIFCAP:
434 mask = ifp->if_capenable ^ ifr->ifr_reqcap;
435 if ((mask & IFCAP_RXCSUM) != 0)
436 ifp->if_capenable ^= IFCAP_RXCSUM;
437 if ((mask & IFCAP_TXCSUM) != 0)
438 ifp->if_capenable ^= IFCAP_TXCSUM;
439 if (ifp->if_capenable & IFCAP_TXCSUM)
440 ifp->if_hwassist = LO_CSUM_FEATURES;
441 else
442 ifp->if_hwassist = 0;
443 break;
444
445 default:
446 error = EINVAL;
447 }
448 return (error);
449}
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