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#include <sys/vimage.h>
53
54#include <net/if.h>
55#include <net/if_clone.h>
56#include <net/if_types.h>
57#include <net/netisr.h>
58#include <net/route.h>
59#include <net/bpf.h>
60#include <net/vnet.h>
61
62#ifdef INET
63#include <netinet/in.h>
64#include <netinet/in_var.h>
65#endif
66
67#ifdef IPX
68#include <netipx/ipx.h>
69#include <netipx/ipx_if.h>
70#endif
71
72#ifdef INET6
73#ifndef INET
74#include <netinet/in.h>
75#endif
76#include <netinet6/in6_var.h>
77#include <netinet/ip6.h>
78#endif
79
80#ifdef NETATALK
81#include <netatalk/at.h>
82#include <netatalk/at_var.h>
83#endif
84
85#include <security/mac/mac_framework.h>
86
87#ifdef TINY_LOMTU
88#define LOMTU (1024+512)
89#elif defined(LARGE_LOMTU)
90#define LOMTU 131072
91#else
92#define LOMTU 16384
93#endif
94
95#define LO_CSUM_FEATURES (CSUM_IP | CSUM_TCP | CSUM_UDP | CSUM_SCTP)
96#define LO_CSUM_SET (CSUM_DATA_VALID | CSUM_PSEUDO_HDR | \
97 CSUM_IP_CHECKED | CSUM_IP_VALID | \
98 CSUM_SCTP_VALID)
99
100int loioctl(struct ifnet *, u_long, caddr_t);
101static void lortrequest(int, struct rtentry *, struct rt_addrinfo *);
102int looutput(struct ifnet *ifp, struct mbuf *m,
103 struct sockaddr *dst, struct route *ro);
104static int lo_clone_create(struct if_clone *, int, caddr_t);
105static void lo_clone_destroy(struct ifnet *);
106static int vnet_loif_iattach(const void *);
107#ifdef VIMAGE
108static int vnet_loif_idetach(const void *);
109#endif
110
111VNET_DEFINE(struct ifnet *, loif); /* Used externally */
112
113#ifdef VIMAGE
114static VNET_DEFINE(struct ifc_simple_data *, lo_cloner_data);
115static VNET_DEFINE(struct if_clone *, lo_cloner);
| 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#include <sys/vimage.h>
53
54#include <net/if.h>
55#include <net/if_clone.h>
56#include <net/if_types.h>
57#include <net/netisr.h>
58#include <net/route.h>
59#include <net/bpf.h>
60#include <net/vnet.h>
61
62#ifdef INET
63#include <netinet/in.h>
64#include <netinet/in_var.h>
65#endif
66
67#ifdef IPX
68#include <netipx/ipx.h>
69#include <netipx/ipx_if.h>
70#endif
71
72#ifdef INET6
73#ifndef INET
74#include <netinet/in.h>
75#endif
76#include <netinet6/in6_var.h>
77#include <netinet/ip6.h>
78#endif
79
80#ifdef NETATALK
81#include <netatalk/at.h>
82#include <netatalk/at_var.h>
83#endif
84
85#include <security/mac/mac_framework.h>
86
87#ifdef TINY_LOMTU
88#define LOMTU (1024+512)
89#elif defined(LARGE_LOMTU)
90#define LOMTU 131072
91#else
92#define LOMTU 16384
93#endif
94
95#define LO_CSUM_FEATURES (CSUM_IP | CSUM_TCP | CSUM_UDP | CSUM_SCTP)
96#define LO_CSUM_SET (CSUM_DATA_VALID | CSUM_PSEUDO_HDR | \
97 CSUM_IP_CHECKED | CSUM_IP_VALID | \
98 CSUM_SCTP_VALID)
99
100int loioctl(struct ifnet *, u_long, caddr_t);
101static void lortrequest(int, struct rtentry *, struct rt_addrinfo *);
102int looutput(struct ifnet *ifp, struct mbuf *m,
103 struct sockaddr *dst, struct route *ro);
104static int lo_clone_create(struct if_clone *, int, caddr_t);
105static void lo_clone_destroy(struct ifnet *);
106static int vnet_loif_iattach(const void *);
107#ifdef VIMAGE
108static int vnet_loif_idetach(const void *);
109#endif
110
111VNET_DEFINE(struct ifnet *, loif); /* Used externally */
112
113#ifdef VIMAGE
114static VNET_DEFINE(struct ifc_simple_data *, lo_cloner_data);
115static VNET_DEFINE(struct if_clone *, lo_cloner);
|
118
119MALLOC_DEFINE(M_LO_CLONER, "lo_cloner", "lo_cloner");
120#endif
121
122#ifdef VIMAGE
123static const vnet_modinfo_t vnet_loif_modinfo = {
124 .vmi_id = VNET_MOD_LOIF,
125 .vmi_dependson = VNET_MOD_IF_CLONE,
126 .vmi_name = "loif",
127 .vmi_iattach = vnet_loif_iattach,
128 .vmi_idetach = vnet_loif_idetach
129};
130#endif
131
132IFC_SIMPLE_DECLARE(lo, 1);
133
134static void
135lo_clone_destroy(struct ifnet *ifp)
136{
137
138#ifndef VIMAGE
139 /* XXX: destroying lo0 will lead to panics. */
140 KASSERT(V_loif != ifp, ("%s: destroying lo0", __func__));
141#endif
142
143 bpfdetach(ifp);
144 if_detach(ifp);
145 if_free(ifp);
146}
147
148static int
149lo_clone_create(struct if_clone *ifc, int unit, caddr_t params)
150{
151 struct ifnet *ifp;
152
153 ifp = if_alloc(IFT_LOOP);
154 if (ifp == NULL)
155 return (ENOSPC);
156
157 if_initname(ifp, ifc->ifc_name, unit);
158 ifp->if_mtu = LOMTU;
159 ifp->if_flags = IFF_LOOPBACK | IFF_MULTICAST;
160 ifp->if_ioctl = loioctl;
161 ifp->if_output = looutput;
162 ifp->if_snd.ifq_maxlen = ifqmaxlen;
163 ifp->if_capabilities = ifp->if_capenable = IFCAP_HWCSUM;
164 ifp->if_hwassist = LO_CSUM_FEATURES;
165 if_attach(ifp);
166 bpfattach(ifp, DLT_NULL, sizeof(u_int32_t));
167 if (V_loif == NULL)
168 V_loif = ifp;
169
170 return (0);
171}
172
173static int
174vnet_loif_iattach(const void *unused __unused)
175{
176
177#ifdef VIMAGE
178 V_lo_cloner = malloc(sizeof(*V_lo_cloner), M_LO_CLONER,
179 M_WAITOK | M_ZERO);
180 V_lo_cloner_data = malloc(sizeof(*V_lo_cloner_data), M_LO_CLONER,
181 M_WAITOK | M_ZERO);
182 bcopy(&lo_cloner, V_lo_cloner, sizeof(*V_lo_cloner));
183 bcopy(lo_cloner.ifc_data, V_lo_cloner_data, sizeof(*V_lo_cloner_data));
184 V_lo_cloner->ifc_data = V_lo_cloner_data;
185 if_clone_attach(V_lo_cloner);
186#else
187 if_clone_attach(&lo_cloner);
188#endif
189 return (0);
190}
191
192#ifdef VIMAGE
193static int
194vnet_loif_idetach(const void *unused __unused)
195{
196
197 if_clone_detach(V_lo_cloner);
198 free(V_lo_cloner, M_LO_CLONER);
199 free(V_lo_cloner_data, M_LO_CLONER);
200 V_loif = NULL;
201
202 return (0);
203}
204#endif
205
206static int
207loop_modevent(module_t mod, int type, void *data)
208{
209
210 switch (type) {
211 case MOD_LOAD:
212#ifdef VIMAGE
213 vnet_mod_register(&vnet_loif_modinfo);
214#else
215 vnet_loif_iattach(NULL);
216#endif
217 break;
218
219 case MOD_UNLOAD:
220 printf("loop module unload - not possible for this module type\n");
221 return (EINVAL);
222
223 default:
224 return (EOPNOTSUPP);
225 }
226 return (0);
227}
228
229static moduledata_t loop_mod = {
230 "loop",
231 loop_modevent,
232 0
233};
234
235DECLARE_MODULE(loop, loop_mod, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY);
236
237int
238looutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
239 struct route *ro)
240{
241 u_int32_t af;
242 struct rtentry *rt = NULL;
243#ifdef MAC
244 int error;
245#endif
246
247 M_ASSERTPKTHDR(m); /* check if we have the packet header */
248
249 if (ro != NULL)
250 rt = ro->ro_rt;
251#ifdef MAC
252 error = mac_ifnet_check_transmit(ifp, m);
253 if (error) {
254 m_freem(m);
255 return (error);
256 }
257#endif
258
259 if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) {
260 m_freem(m);
261 return (rt->rt_flags & RTF_BLACKHOLE ? 0 :
262 rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH);
263 }
264
265 ifp->if_opackets++;
266 ifp->if_obytes += m->m_pkthdr.len;
267
268 /* BPF writes need to be handled specially. */
269 if (dst->sa_family == AF_UNSPEC) {
270 bcopy(dst->sa_data, &af, sizeof(af));
271 dst->sa_family = af;
272 }
273
274#if 1 /* XXX */
275 switch (dst->sa_family) {
276 case AF_INET:
277 if (ifp->if_capenable & IFCAP_RXCSUM) {
278 m->m_pkthdr.csum_data = 0xffff;
279 m->m_pkthdr.csum_flags = LO_CSUM_SET;
280 }
281 m->m_pkthdr.csum_flags &= ~LO_CSUM_FEATURES;
282 case AF_INET6:
283 case AF_IPX:
284 case AF_APPLETALK:
285 break;
286 default:
287 printf("looutput: af=%d unexpected\n", dst->sa_family);
288 m_freem(m);
289 return (EAFNOSUPPORT);
290 }
291#endif
292 return (if_simloop(ifp, m, dst->sa_family, 0));
293}
294
295/*
296 * if_simloop()
297 *
298 * This function is to support software emulation of hardware loopback,
299 * i.e., for interfaces with the IFF_SIMPLEX attribute. Since they can't
300 * hear their own broadcasts, we create a copy of the packet that we
301 * would normally receive via a hardware loopback.
302 *
303 * This function expects the packet to include the media header of length hlen.
304 */
305int
306if_simloop(struct ifnet *ifp, struct mbuf *m, int af, int hlen)
307{
308 int isr;
309
310 M_ASSERTPKTHDR(m);
311 m_tag_delete_nonpersistent(m);
312 m->m_pkthdr.rcvif = ifp;
313
314#ifdef MAC
315 mac_ifnet_create_mbuf(ifp, m);
316#endif
317
318 /*
319 * Let BPF see incoming packet in the following manner:
320 * - Emulated packet loopback for a simplex interface
321 * (net/if_ethersubr.c)
322 * -> passes it to ifp's BPF
323 * - IPv4/v6 multicast packet loopback (netinet(6)/ip(6)_output.c)
324 * -> not passes it to any BPF
325 * - Normal packet loopback from myself to myself (net/if_loop.c)
326 * -> passes to lo0's BPF (even in case of IPv6, where ifp!=lo0)
327 */
328 if (hlen > 0) {
329 if (bpf_peers_present(ifp->if_bpf)) {
330 bpf_mtap(ifp->if_bpf, m);
331 }
332 } else {
333 if (bpf_peers_present(V_loif->if_bpf)) {
334 if ((m->m_flags & M_MCAST) == 0 || V_loif == ifp) {
335 /* XXX beware sizeof(af) != 4 */
336 u_int32_t af1 = af;
337
338 /*
339 * We need to prepend the address family.
340 */
341 bpf_mtap2(V_loif->if_bpf, &af1, sizeof(af1), m);
342 }
343 }
344 }
345
346 /* Strip away media header */
347 if (hlen > 0) {
348 m_adj(m, hlen);
349#ifndef __NO_STRICT_ALIGNMENT
350 /*
351 * Some archs do not like unaligned data, so
352 * we move data down in the first mbuf.
353 */
354 if (mtod(m, vm_offset_t) & 3) {
355 KASSERT(hlen >= 3, ("if_simloop: hlen too small"));
356 bcopy(m->m_data,
357 (char *)(mtod(m, vm_offset_t)
358 - (mtod(m, vm_offset_t) & 3)),
359 m->m_len);
360 m->m_data -= (mtod(m,vm_offset_t) & 3);
361 }
362#endif
363 }
364
365 /* Deliver to upper layer protocol */
366 switch (af) {
367#ifdef INET
368 case AF_INET:
369 isr = NETISR_IP;
370 break;
371#endif
372#ifdef INET6
373 case AF_INET6:
374 m->m_flags |= M_LOOP;
375 isr = NETISR_IPV6;
376 break;
377#endif
378#ifdef IPX
379 case AF_IPX:
380 isr = NETISR_IPX;
381 break;
382#endif
383#ifdef NETATALK
384 case AF_APPLETALK:
385 isr = NETISR_ATALK2;
386 break;
387#endif
388 default:
389 printf("if_simloop: can't handle af=%d\n", af);
390 m_freem(m);
391 return (EAFNOSUPPORT);
392 }
393 ifp->if_ipackets++;
394 ifp->if_ibytes += m->m_pkthdr.len;
395 netisr_queue(isr, m); /* mbuf is free'd on failure. */
396 return (0);
397}
398
399/* ARGSUSED */
400static void
401lortrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info)
402{
403
404 RT_LOCK_ASSERT(rt);
405 rt->rt_rmx.rmx_mtu = rt->rt_ifp->if_mtu;
406}
407
408/*
409 * Process an ioctl request.
410 */
411/* ARGSUSED */
412int
413loioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
414{
415 struct ifaddr *ifa;
416 struct ifreq *ifr = (struct ifreq *)data;
417 int error = 0, mask;
418
419 switch (cmd) {
420 case SIOCSIFADDR:
421 ifp->if_flags |= IFF_UP;
422 ifp->if_drv_flags |= IFF_DRV_RUNNING;
423 ifa = (struct ifaddr *)data;
424 ifa->ifa_rtrequest = lortrequest;
425 /*
426 * Everything else is done at a higher level.
427 */
428 break;
429
430 case SIOCADDMULTI:
431 case SIOCDELMULTI:
432 if (ifr == 0) {
433 error = EAFNOSUPPORT; /* XXX */
434 break;
435 }
436 switch (ifr->ifr_addr.sa_family) {
437
438#ifdef INET
439 case AF_INET:
440 break;
441#endif
442#ifdef INET6
443 case AF_INET6:
444 break;
445#endif
446
447 default:
448 error = EAFNOSUPPORT;
449 break;
450 }
451 break;
452
453 case SIOCSIFMTU:
454 ifp->if_mtu = ifr->ifr_mtu;
455 break;
456
457 case SIOCSIFFLAGS:
458 break;
459
460 case SIOCSIFCAP:
461 mask = ifp->if_capenable ^ ifr->ifr_reqcap;
462 if ((mask & IFCAP_RXCSUM) != 0)
463 ifp->if_capenable ^= IFCAP_RXCSUM;
464 if ((mask & IFCAP_TXCSUM) != 0)
465 ifp->if_capenable ^= IFCAP_TXCSUM;
466 if (ifp->if_capenable & IFCAP_TXCSUM)
467 ifp->if_hwassist = LO_CSUM_FEATURES;
468 else
469 ifp->if_hwassist = 0;
470 break;
471
472 default:
473 error = EINVAL;
474 }
475 return (error);
476}
| 118
119MALLOC_DEFINE(M_LO_CLONER, "lo_cloner", "lo_cloner");
120#endif
121
122#ifdef VIMAGE
123static const vnet_modinfo_t vnet_loif_modinfo = {
124 .vmi_id = VNET_MOD_LOIF,
125 .vmi_dependson = VNET_MOD_IF_CLONE,
126 .vmi_name = "loif",
127 .vmi_iattach = vnet_loif_iattach,
128 .vmi_idetach = vnet_loif_idetach
129};
130#endif
131
132IFC_SIMPLE_DECLARE(lo, 1);
133
134static void
135lo_clone_destroy(struct ifnet *ifp)
136{
137
138#ifndef VIMAGE
139 /* XXX: destroying lo0 will lead to panics. */
140 KASSERT(V_loif != ifp, ("%s: destroying lo0", __func__));
141#endif
142
143 bpfdetach(ifp);
144 if_detach(ifp);
145 if_free(ifp);
146}
147
148static int
149lo_clone_create(struct if_clone *ifc, int unit, caddr_t params)
150{
151 struct ifnet *ifp;
152
153 ifp = if_alloc(IFT_LOOP);
154 if (ifp == NULL)
155 return (ENOSPC);
156
157 if_initname(ifp, ifc->ifc_name, unit);
158 ifp->if_mtu = LOMTU;
159 ifp->if_flags = IFF_LOOPBACK | IFF_MULTICAST;
160 ifp->if_ioctl = loioctl;
161 ifp->if_output = looutput;
162 ifp->if_snd.ifq_maxlen = ifqmaxlen;
163 ifp->if_capabilities = ifp->if_capenable = IFCAP_HWCSUM;
164 ifp->if_hwassist = LO_CSUM_FEATURES;
165 if_attach(ifp);
166 bpfattach(ifp, DLT_NULL, sizeof(u_int32_t));
167 if (V_loif == NULL)
168 V_loif = ifp;
169
170 return (0);
171}
172
173static int
174vnet_loif_iattach(const void *unused __unused)
175{
176
177#ifdef VIMAGE
178 V_lo_cloner = malloc(sizeof(*V_lo_cloner), M_LO_CLONER,
179 M_WAITOK | M_ZERO);
180 V_lo_cloner_data = malloc(sizeof(*V_lo_cloner_data), M_LO_CLONER,
181 M_WAITOK | M_ZERO);
182 bcopy(&lo_cloner, V_lo_cloner, sizeof(*V_lo_cloner));
183 bcopy(lo_cloner.ifc_data, V_lo_cloner_data, sizeof(*V_lo_cloner_data));
184 V_lo_cloner->ifc_data = V_lo_cloner_data;
185 if_clone_attach(V_lo_cloner);
186#else
187 if_clone_attach(&lo_cloner);
188#endif
189 return (0);
190}
191
192#ifdef VIMAGE
193static int
194vnet_loif_idetach(const void *unused __unused)
195{
196
197 if_clone_detach(V_lo_cloner);
198 free(V_lo_cloner, M_LO_CLONER);
199 free(V_lo_cloner_data, M_LO_CLONER);
200 V_loif = NULL;
201
202 return (0);
203}
204#endif
205
206static int
207loop_modevent(module_t mod, int type, void *data)
208{
209
210 switch (type) {
211 case MOD_LOAD:
212#ifdef VIMAGE
213 vnet_mod_register(&vnet_loif_modinfo);
214#else
215 vnet_loif_iattach(NULL);
216#endif
217 break;
218
219 case MOD_UNLOAD:
220 printf("loop module unload - not possible for this module type\n");
221 return (EINVAL);
222
223 default:
224 return (EOPNOTSUPP);
225 }
226 return (0);
227}
228
229static moduledata_t loop_mod = {
230 "loop",
231 loop_modevent,
232 0
233};
234
235DECLARE_MODULE(loop, loop_mod, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY);
236
237int
238looutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
239 struct route *ro)
240{
241 u_int32_t af;
242 struct rtentry *rt = NULL;
243#ifdef MAC
244 int error;
245#endif
246
247 M_ASSERTPKTHDR(m); /* check if we have the packet header */
248
249 if (ro != NULL)
250 rt = ro->ro_rt;
251#ifdef MAC
252 error = mac_ifnet_check_transmit(ifp, m);
253 if (error) {
254 m_freem(m);
255 return (error);
256 }
257#endif
258
259 if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) {
260 m_freem(m);
261 return (rt->rt_flags & RTF_BLACKHOLE ? 0 :
262 rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH);
263 }
264
265 ifp->if_opackets++;
266 ifp->if_obytes += m->m_pkthdr.len;
267
268 /* BPF writes need to be handled specially. */
269 if (dst->sa_family == AF_UNSPEC) {
270 bcopy(dst->sa_data, &af, sizeof(af));
271 dst->sa_family = af;
272 }
273
274#if 1 /* XXX */
275 switch (dst->sa_family) {
276 case AF_INET:
277 if (ifp->if_capenable & IFCAP_RXCSUM) {
278 m->m_pkthdr.csum_data = 0xffff;
279 m->m_pkthdr.csum_flags = LO_CSUM_SET;
280 }
281 m->m_pkthdr.csum_flags &= ~LO_CSUM_FEATURES;
282 case AF_INET6:
283 case AF_IPX:
284 case AF_APPLETALK:
285 break;
286 default:
287 printf("looutput: af=%d unexpected\n", dst->sa_family);
288 m_freem(m);
289 return (EAFNOSUPPORT);
290 }
291#endif
292 return (if_simloop(ifp, m, dst->sa_family, 0));
293}
294
295/*
296 * if_simloop()
297 *
298 * This function is to support software emulation of hardware loopback,
299 * i.e., for interfaces with the IFF_SIMPLEX attribute. Since they can't
300 * hear their own broadcasts, we create a copy of the packet that we
301 * would normally receive via a hardware loopback.
302 *
303 * This function expects the packet to include the media header of length hlen.
304 */
305int
306if_simloop(struct ifnet *ifp, struct mbuf *m, int af, int hlen)
307{
308 int isr;
309
310 M_ASSERTPKTHDR(m);
311 m_tag_delete_nonpersistent(m);
312 m->m_pkthdr.rcvif = ifp;
313
314#ifdef MAC
315 mac_ifnet_create_mbuf(ifp, m);
316#endif
317
318 /*
319 * Let BPF see incoming packet in the following manner:
320 * - Emulated packet loopback for a simplex interface
321 * (net/if_ethersubr.c)
322 * -> passes it to ifp's BPF
323 * - IPv4/v6 multicast packet loopback (netinet(6)/ip(6)_output.c)
324 * -> not passes it to any BPF
325 * - Normal packet loopback from myself to myself (net/if_loop.c)
326 * -> passes to lo0's BPF (even in case of IPv6, where ifp!=lo0)
327 */
328 if (hlen > 0) {
329 if (bpf_peers_present(ifp->if_bpf)) {
330 bpf_mtap(ifp->if_bpf, m);
331 }
332 } else {
333 if (bpf_peers_present(V_loif->if_bpf)) {
334 if ((m->m_flags & M_MCAST) == 0 || V_loif == ifp) {
335 /* XXX beware sizeof(af) != 4 */
336 u_int32_t af1 = af;
337
338 /*
339 * We need to prepend the address family.
340 */
341 bpf_mtap2(V_loif->if_bpf, &af1, sizeof(af1), m);
342 }
343 }
344 }
345
346 /* Strip away media header */
347 if (hlen > 0) {
348 m_adj(m, hlen);
349#ifndef __NO_STRICT_ALIGNMENT
350 /*
351 * Some archs do not like unaligned data, so
352 * we move data down in the first mbuf.
353 */
354 if (mtod(m, vm_offset_t) & 3) {
355 KASSERT(hlen >= 3, ("if_simloop: hlen too small"));
356 bcopy(m->m_data,
357 (char *)(mtod(m, vm_offset_t)
358 - (mtod(m, vm_offset_t) & 3)),
359 m->m_len);
360 m->m_data -= (mtod(m,vm_offset_t) & 3);
361 }
362#endif
363 }
364
365 /* Deliver to upper layer protocol */
366 switch (af) {
367#ifdef INET
368 case AF_INET:
369 isr = NETISR_IP;
370 break;
371#endif
372#ifdef INET6
373 case AF_INET6:
374 m->m_flags |= M_LOOP;
375 isr = NETISR_IPV6;
376 break;
377#endif
378#ifdef IPX
379 case AF_IPX:
380 isr = NETISR_IPX;
381 break;
382#endif
383#ifdef NETATALK
384 case AF_APPLETALK:
385 isr = NETISR_ATALK2;
386 break;
387#endif
388 default:
389 printf("if_simloop: can't handle af=%d\n", af);
390 m_freem(m);
391 return (EAFNOSUPPORT);
392 }
393 ifp->if_ipackets++;
394 ifp->if_ibytes += m->m_pkthdr.len;
395 netisr_queue(isr, m); /* mbuf is free'd on failure. */
396 return (0);
397}
398
399/* ARGSUSED */
400static void
401lortrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info)
402{
403
404 RT_LOCK_ASSERT(rt);
405 rt->rt_rmx.rmx_mtu = rt->rt_ifp->if_mtu;
406}
407
408/*
409 * Process an ioctl request.
410 */
411/* ARGSUSED */
412int
413loioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
414{
415 struct ifaddr *ifa;
416 struct ifreq *ifr = (struct ifreq *)data;
417 int error = 0, mask;
418
419 switch (cmd) {
420 case SIOCSIFADDR:
421 ifp->if_flags |= IFF_UP;
422 ifp->if_drv_flags |= IFF_DRV_RUNNING;
423 ifa = (struct ifaddr *)data;
424 ifa->ifa_rtrequest = lortrequest;
425 /*
426 * Everything else is done at a higher level.
427 */
428 break;
429
430 case SIOCADDMULTI:
431 case SIOCDELMULTI:
432 if (ifr == 0) {
433 error = EAFNOSUPPORT; /* XXX */
434 break;
435 }
436 switch (ifr->ifr_addr.sa_family) {
437
438#ifdef INET
439 case AF_INET:
440 break;
441#endif
442#ifdef INET6
443 case AF_INET6:
444 break;
445#endif
446
447 default:
448 error = EAFNOSUPPORT;
449 break;
450 }
451 break;
452
453 case SIOCSIFMTU:
454 ifp->if_mtu = ifr->ifr_mtu;
455 break;
456
457 case SIOCSIFFLAGS:
458 break;
459
460 case SIOCSIFCAP:
461 mask = ifp->if_capenable ^ ifr->ifr_reqcap;
462 if ((mask & IFCAP_RXCSUM) != 0)
463 ifp->if_capenable ^= IFCAP_RXCSUM;
464 if ((mask & IFCAP_TXCSUM) != 0)
465 ifp->if_capenable ^= IFCAP_TXCSUM;
466 if (ifp->if_capenable & IFCAP_TXCSUM)
467 ifp->if_hwassist = LO_CSUM_FEATURES;
468 else
469 ifp->if_hwassist = 0;
470 break;
471
472 default:
473 error = EINVAL;
474 }
475 return (error);
476}
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