FreeBSD/Linux Kernel Cross Reference
sys/net/if_me.c
1 /*-
2 * Copyright (c) 2014 Andrey V. Elsukov <ae@FreeBSD.org>
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 *
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 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD: releng/11.1/sys/net/if_me.c 317403 2017-04-25 11:19:22Z ae $");
29
30 #include <sys/param.h>
31 #include <sys/jail.h>
32 #include <sys/kernel.h>
33 #include <sys/lock.h>
34 #include <sys/libkern.h>
35 #include <sys/malloc.h>
36 #include <sys/module.h>
37 #include <sys/mbuf.h>
38 #include <sys/priv.h>
39 #include <sys/proc.h>
40 #include <sys/protosw.h>
41 #include <sys/rmlock.h>
42 #include <sys/socket.h>
43 #include <sys/sockio.h>
44 #include <sys/sx.h>
45 #include <sys/sysctl.h>
46 #include <sys/syslog.h>
47 #include <sys/systm.h>
48
49 #include <net/bpf.h>
50 #include <net/ethernet.h>
51 #include <net/if.h>
52 #include <net/if_var.h>
53 #include <net/if_clone.h>
54 #include <net/if_types.h>
55 #include <net/netisr.h>
56 #include <net/vnet.h>
57 #include <net/route.h>
58
59 #include <netinet/in.h>
60 #include <netinet/in_systm.h>
61 #include <netinet/in_var.h>
62 #include <netinet/ip.h>
63 #include <netinet/ip_var.h>
64 #include <netinet/ip_encap.h>
65
66 #include <machine/in_cksum.h>
67 #include <security/mac/mac_framework.h>
68
69 #define MEMTU (1500 - sizeof(struct mobhdr))
70 static const char mename[] = "me";
71 static MALLOC_DEFINE(M_IFME, mename, "Minimal Encapsulation for IP");
72 static VNET_DEFINE(struct mtx, me_mtx);
73 #define V_me_mtx VNET(me_mtx)
74 /* Minimal forwarding header RFC 2004 */
75 struct mobhdr {
76 uint8_t mob_proto; /* protocol */
77 uint8_t mob_flags; /* flags */
78 #define MOB_FLAGS_SP 0x80 /* source present */
79 uint16_t mob_csum; /* header checksum */
80 struct in_addr mob_dst; /* original destination address */
81 struct in_addr mob_src; /* original source addr (optional) */
82 } __packed;
83
84 struct me_softc {
85 struct ifnet *me_ifp;
86 LIST_ENTRY(me_softc) me_list;
87 struct rmlock me_lock;
88 u_int me_fibnum;
89 const struct encaptab *me_ecookie;
90 struct in_addr me_src;
91 struct in_addr me_dst;
92 };
93 #define ME2IFP(sc) ((sc)->me_ifp)
94 #define ME_READY(sc) ((sc)->me_src.s_addr != 0)
95 #define ME_LOCK_INIT(sc) rm_init(&(sc)->me_lock, "me softc")
96 #define ME_LOCK_DESTROY(sc) rm_destroy(&(sc)->me_lock)
97 #define ME_RLOCK_TRACKER struct rm_priotracker me_tracker
98 #define ME_RLOCK(sc) rm_rlock(&(sc)->me_lock, &me_tracker)
99 #define ME_RUNLOCK(sc) rm_runlock(&(sc)->me_lock, &me_tracker)
100 #define ME_RLOCK_ASSERT(sc) rm_assert(&(sc)->me_lock, RA_RLOCKED)
101 #define ME_WLOCK(sc) rm_wlock(&(sc)->me_lock)
102 #define ME_WUNLOCK(sc) rm_wunlock(&(sc)->me_lock)
103 #define ME_WLOCK_ASSERT(sc) rm_assert(&(sc)->me_lock, RA_WLOCKED)
104
105 #define ME_LIST_LOCK_INIT(x) mtx_init(&V_me_mtx, "me_mtx", NULL, MTX_DEF)
106 #define ME_LIST_LOCK_DESTROY(x) mtx_destroy(&V_me_mtx)
107 #define ME_LIST_LOCK(x) mtx_lock(&V_me_mtx)
108 #define ME_LIST_UNLOCK(x) mtx_unlock(&V_me_mtx)
109
110 static VNET_DEFINE(LIST_HEAD(, me_softc), me_softc_list);
111 #define V_me_softc_list VNET(me_softc_list)
112 static struct sx me_ioctl_sx;
113 SX_SYSINIT(me_ioctl_sx, &me_ioctl_sx, "me_ioctl");
114
115 static int me_clone_create(struct if_clone *, int, caddr_t);
116 static void me_clone_destroy(struct ifnet *);
117 static VNET_DEFINE(struct if_clone *, me_cloner);
118 #define V_me_cloner VNET(me_cloner)
119
120 static void me_qflush(struct ifnet *);
121 static int me_transmit(struct ifnet *, struct mbuf *);
122 static int me_ioctl(struct ifnet *, u_long, caddr_t);
123 static int me_output(struct ifnet *, struct mbuf *,
124 const struct sockaddr *, struct route *);
125 static int me_input(struct mbuf **, int *, int);
126
127 static int me_set_tunnel(struct ifnet *, struct sockaddr_in *,
128 struct sockaddr_in *);
129 static void me_delete_tunnel(struct ifnet *);
130
131 SYSCTL_DECL(_net_link);
132 static SYSCTL_NODE(_net_link, IFT_TUNNEL, me, CTLFLAG_RW, 0,
133 "Minimal Encapsulation for IP (RFC 2004)");
134 #ifndef MAX_ME_NEST
135 #define MAX_ME_NEST 1
136 #endif
137
138 static VNET_DEFINE(int, max_me_nesting) = MAX_ME_NEST;
139 #define V_max_me_nesting VNET(max_me_nesting)
140 SYSCTL_INT(_net_link_me, OID_AUTO, max_nesting, CTLFLAG_RW | CTLFLAG_VNET,
141 &VNET_NAME(max_me_nesting), 0, "Max nested tunnels");
142
143 extern struct domain inetdomain;
144 static const struct protosw in_mobile_protosw = {
145 .pr_type = SOCK_RAW,
146 .pr_domain = &inetdomain,
147 .pr_protocol = IPPROTO_MOBILE,
148 .pr_flags = PR_ATOMIC|PR_ADDR,
149 .pr_input = me_input,
150 .pr_output = rip_output,
151 .pr_ctlinput = rip_ctlinput,
152 .pr_ctloutput = rip_ctloutput,
153 .pr_usrreqs = &rip_usrreqs
154 };
155
156 static void
157 vnet_me_init(const void *unused __unused)
158 {
159 LIST_INIT(&V_me_softc_list);
160 ME_LIST_LOCK_INIT();
161 V_me_cloner = if_clone_simple(mename, me_clone_create,
162 me_clone_destroy, 0);
163 }
164 VNET_SYSINIT(vnet_me_init, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY,
165 vnet_me_init, NULL);
166
167 static void
168 vnet_me_uninit(const void *unused __unused)
169 {
170
171 if_clone_detach(V_me_cloner);
172 ME_LIST_LOCK_DESTROY();
173 }
174 VNET_SYSUNINIT(vnet_me_uninit, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY,
175 vnet_me_uninit, NULL);
176
177 static int
178 me_clone_create(struct if_clone *ifc, int unit, caddr_t params)
179 {
180 struct me_softc *sc;
181
182 sc = malloc(sizeof(struct me_softc), M_IFME, M_WAITOK | M_ZERO);
183 sc->me_fibnum = curthread->td_proc->p_fibnum;
184 ME2IFP(sc) = if_alloc(IFT_TUNNEL);
185 ME_LOCK_INIT(sc);
186 ME2IFP(sc)->if_softc = sc;
187 if_initname(ME2IFP(sc), mename, unit);
188
189 ME2IFP(sc)->if_mtu = MEMTU;;
190 ME2IFP(sc)->if_flags = IFF_POINTOPOINT|IFF_MULTICAST;
191 ME2IFP(sc)->if_output = me_output;
192 ME2IFP(sc)->if_ioctl = me_ioctl;
193 ME2IFP(sc)->if_transmit = me_transmit;
194 ME2IFP(sc)->if_qflush = me_qflush;
195 ME2IFP(sc)->if_capabilities |= IFCAP_LINKSTATE;
196 ME2IFP(sc)->if_capenable |= IFCAP_LINKSTATE;
197 if_attach(ME2IFP(sc));
198 bpfattach(ME2IFP(sc), DLT_NULL, sizeof(u_int32_t));
199 ME_LIST_LOCK();
200 LIST_INSERT_HEAD(&V_me_softc_list, sc, me_list);
201 ME_LIST_UNLOCK();
202 return (0);
203 }
204
205 static void
206 me_clone_destroy(struct ifnet *ifp)
207 {
208 struct me_softc *sc;
209
210 sx_xlock(&me_ioctl_sx);
211 sc = ifp->if_softc;
212 me_delete_tunnel(ifp);
213 ME_LIST_LOCK();
214 LIST_REMOVE(sc, me_list);
215 ME_LIST_UNLOCK();
216 bpfdetach(ifp);
217 if_detach(ifp);
218 ifp->if_softc = NULL;
219 sx_xunlock(&me_ioctl_sx);
220
221 if_free(ifp);
222 ME_LOCK_DESTROY(sc);
223 free(sc, M_IFME);
224 }
225
226 static int
227 me_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
228 {
229 ME_RLOCK_TRACKER;
230 struct ifreq *ifr = (struct ifreq *)data;
231 struct sockaddr_in *src, *dst;
232 struct me_softc *sc;
233 int error;
234
235 switch (cmd) {
236 case SIOCSIFMTU:
237 if (ifr->ifr_mtu < 576)
238 return (EINVAL);
239 ifp->if_mtu = ifr->ifr_mtu;
240 return (0);
241 case SIOCSIFADDR:
242 ifp->if_flags |= IFF_UP;
243 case SIOCSIFFLAGS:
244 case SIOCADDMULTI:
245 case SIOCDELMULTI:
246 return (0);
247 }
248 sx_xlock(&me_ioctl_sx);
249 sc = ifp->if_softc;
250 if (sc == NULL) {
251 error = ENXIO;
252 goto end;
253 }
254 error = 0;
255 switch (cmd) {
256 case SIOCSIFPHYADDR:
257 src = (struct sockaddr_in *)
258 &(((struct in_aliasreq *)data)->ifra_addr);
259 dst = (struct sockaddr_in *)
260 &(((struct in_aliasreq *)data)->ifra_dstaddr);
261 if (src->sin_family != dst->sin_family ||
262 src->sin_family != AF_INET ||
263 src->sin_len != dst->sin_len ||
264 src->sin_len != sizeof(struct sockaddr_in)) {
265 error = EINVAL;
266 break;
267 }
268 if (src->sin_addr.s_addr == INADDR_ANY ||
269 dst->sin_addr.s_addr == INADDR_ANY) {
270 error = EADDRNOTAVAIL;
271 break;
272 }
273 error = me_set_tunnel(ifp, src, dst);
274 break;
275 case SIOCDIFPHYADDR:
276 me_delete_tunnel(ifp);
277 break;
278 case SIOCGIFPSRCADDR:
279 case SIOCGIFPDSTADDR:
280 ME_RLOCK(sc);
281 if (!ME_READY(sc)) {
282 error = EADDRNOTAVAIL;
283 ME_RUNLOCK(sc);
284 break;
285 }
286 src = (struct sockaddr_in *)&ifr->ifr_addr;
287 memset(src, 0, sizeof(*src));
288 src->sin_family = AF_INET;
289 src->sin_len = sizeof(*src);
290 switch (cmd) {
291 case SIOCGIFPSRCADDR:
292 src->sin_addr = sc->me_src;
293 break;
294 case SIOCGIFPDSTADDR:
295 src->sin_addr = sc->me_dst;
296 break;
297 }
298 ME_RUNLOCK(sc);
299 error = prison_if(curthread->td_ucred, sintosa(src));
300 if (error != 0)
301 memset(src, 0, sizeof(*src));
302 break;
303 case SIOCGTUNFIB:
304 ifr->ifr_fib = sc->me_fibnum;
305 break;
306 case SIOCSTUNFIB:
307 if ((error = priv_check(curthread, PRIV_NET_GRE)) != 0)
308 break;
309 if (ifr->ifr_fib >= rt_numfibs)
310 error = EINVAL;
311 else
312 sc->me_fibnum = ifr->ifr_fib;
313 break;
314 default:
315 error = EINVAL;
316 break;
317 }
318 end:
319 sx_xunlock(&me_ioctl_sx);
320 return (error);
321 }
322
323 static int
324 me_encapcheck(const struct mbuf *m, int off, int proto, void *arg)
325 {
326 ME_RLOCK_TRACKER;
327 struct me_softc *sc;
328 struct ip *ip;
329 int ret;
330
331 sc = (struct me_softc *)arg;
332 if ((ME2IFP(sc)->if_flags & IFF_UP) == 0)
333 return (0);
334
335 M_ASSERTPKTHDR(m);
336
337 if (m->m_pkthdr.len < sizeof(struct ip) + sizeof(struct mobhdr) -
338 sizeof(struct in_addr))
339 return (0);
340
341 ret = 0;
342 ME_RLOCK(sc);
343 if (ME_READY(sc)) {
344 ip = mtod(m, struct ip *);
345 if (sc->me_src.s_addr == ip->ip_dst.s_addr &&
346 sc->me_dst.s_addr == ip->ip_src.s_addr)
347 ret = 32 * 2;
348 }
349 ME_RUNLOCK(sc);
350 return (ret);
351 }
352
353 static int
354 me_set_tunnel(struct ifnet *ifp, struct sockaddr_in *src,
355 struct sockaddr_in *dst)
356 {
357 struct me_softc *sc, *tsc;
358
359 sx_assert(&me_ioctl_sx, SA_XLOCKED);
360 ME_LIST_LOCK();
361 sc = ifp->if_softc;
362 LIST_FOREACH(tsc, &V_me_softc_list, me_list) {
363 if (tsc == sc || !ME_READY(tsc))
364 continue;
365 if (tsc->me_src.s_addr == src->sin_addr.s_addr &&
366 tsc->me_dst.s_addr == dst->sin_addr.s_addr) {
367 ME_LIST_UNLOCK();
368 return (EADDRNOTAVAIL);
369 }
370 }
371 ME_LIST_UNLOCK();
372
373 ME_WLOCK(sc);
374 sc->me_dst = dst->sin_addr;
375 sc->me_src = src->sin_addr;
376 ME_WUNLOCK(sc);
377
378 if (sc->me_ecookie == NULL)
379 sc->me_ecookie = encap_attach_func(AF_INET, IPPROTO_MOBILE,
380 me_encapcheck, &in_mobile_protosw, sc);
381 if (sc->me_ecookie != NULL) {
382 ifp->if_drv_flags |= IFF_DRV_RUNNING;
383 if_link_state_change(ifp, LINK_STATE_UP);
384 }
385 return (0);
386 }
387
388 static void
389 me_delete_tunnel(struct ifnet *ifp)
390 {
391 struct me_softc *sc = ifp->if_softc;
392
393 sx_assert(&me_ioctl_sx, SA_XLOCKED);
394 if (sc->me_ecookie != NULL)
395 encap_detach(sc->me_ecookie);
396 sc->me_ecookie = NULL;
397 ME_WLOCK(sc);
398 sc->me_src.s_addr = 0;
399 sc->me_dst.s_addr = 0;
400 ME_WUNLOCK(sc);
401 ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
402 if_link_state_change(ifp, LINK_STATE_DOWN);
403 }
404
405 static uint16_t
406 me_in_cksum(uint16_t *p, int nwords)
407 {
408 uint32_t sum = 0;
409
410 while (nwords-- > 0)
411 sum += *p++;
412 sum = (sum >> 16) + (sum & 0xffff);
413 sum += (sum >> 16);
414 return (~sum);
415 }
416
417 int
418 me_input(struct mbuf **mp, int *offp, int proto)
419 {
420 struct me_softc *sc;
421 struct mobhdr *mh;
422 struct ifnet *ifp;
423 struct mbuf *m;
424 struct ip *ip;
425 int hlen;
426
427 m = *mp;
428 sc = encap_getarg(m);
429 KASSERT(sc != NULL, ("encap_getarg returned NULL"));
430
431 ifp = ME2IFP(sc);
432 /* checks for short packets */
433 hlen = sizeof(struct mobhdr);
434 if (m->m_pkthdr.len < sizeof(struct ip) + hlen)
435 hlen -= sizeof(struct in_addr);
436 if (m->m_len < sizeof(struct ip) + hlen)
437 m = m_pullup(m, sizeof(struct ip) + hlen);
438 if (m == NULL)
439 goto drop;
440 mh = (struct mobhdr *)mtodo(m, sizeof(struct ip));
441 /* check for wrong flags */
442 if (mh->mob_flags & (~MOB_FLAGS_SP)) {
443 m_freem(m);
444 goto drop;
445 }
446 if (mh->mob_flags) {
447 if (hlen != sizeof(struct mobhdr)) {
448 m_freem(m);
449 goto drop;
450 }
451 } else
452 hlen = sizeof(struct mobhdr) - sizeof(struct in_addr);
453 /* check mobile header checksum */
454 if (me_in_cksum((uint16_t *)mh, hlen / sizeof(uint16_t)) != 0) {
455 m_freem(m);
456 goto drop;
457 }
458 #ifdef MAC
459 mac_ifnet_create_mbuf(ifp, m);
460 #endif
461 ip = mtod(m, struct ip *);
462 ip->ip_dst = mh->mob_dst;
463 ip->ip_p = mh->mob_proto;
464 ip->ip_sum = 0;
465 ip->ip_len = htons(m->m_pkthdr.len - hlen);
466 if (mh->mob_flags)
467 ip->ip_src = mh->mob_src;
468 memmove(mtodo(m, hlen), ip, sizeof(struct ip));
469 m_adj(m, hlen);
470 m_clrprotoflags(m);
471 m->m_pkthdr.rcvif = ifp;
472 m->m_pkthdr.csum_flags |= (CSUM_IP_CHECKED | CSUM_IP_VALID);
473 M_SETFIB(m, ifp->if_fib);
474 hlen = AF_INET;
475 BPF_MTAP2(ifp, &hlen, sizeof(hlen), m);
476 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
477 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
478 if ((ifp->if_flags & IFF_MONITOR) != 0)
479 m_freem(m);
480 else
481 netisr_dispatch(NETISR_IP, m);
482 return (IPPROTO_DONE);
483 drop:
484 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
485 return (IPPROTO_DONE);
486 }
487
488 #define MTAG_ME 1414491977
489 static int
490 me_check_nesting(struct ifnet *ifp, struct mbuf *m)
491 {
492 struct m_tag *mtag;
493 int count;
494
495 count = 1;
496 mtag = NULL;
497 while ((mtag = m_tag_locate(m, MTAG_ME, 0, mtag)) != NULL) {
498 if (*(struct ifnet **)(mtag + 1) == ifp) {
499 log(LOG_NOTICE, "%s: loop detected\n", ifp->if_xname);
500 return (EIO);
501 }
502 count++;
503 }
504 if (count > V_max_me_nesting) {
505 log(LOG_NOTICE,
506 "%s: if_output recursively called too many times(%d)\n",
507 ifp->if_xname, count);
508 return (EIO);
509 }
510 mtag = m_tag_alloc(MTAG_ME, 0, sizeof(struct ifnet *), M_NOWAIT);
511 if (mtag == NULL)
512 return (ENOMEM);
513 *(struct ifnet **)(mtag + 1) = ifp;
514 m_tag_prepend(m, mtag);
515 return (0);
516 }
517
518 static int
519 me_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst,
520 struct route *ro)
521 {
522 uint32_t af;
523 int error;
524
525 #ifdef MAC
526 error = mac_ifnet_check_transmit(ifp, m);
527 if (error != 0)
528 goto drop;
529 #endif
530 if ((ifp->if_flags & IFF_MONITOR) != 0 ||
531 (ifp->if_flags & IFF_UP) == 0) {
532 error = ENETDOWN;
533 goto drop;
534 }
535
536 error = me_check_nesting(ifp, m);
537 if (error != 0)
538 goto drop;
539
540 m->m_flags &= ~(M_BCAST|M_MCAST);
541 if (dst->sa_family == AF_UNSPEC)
542 bcopy(dst->sa_data, &af, sizeof(af));
543 else
544 af = dst->sa_family;
545 if (af != AF_INET) {
546 error = EAFNOSUPPORT;
547 goto drop;
548 }
549 BPF_MTAP2(ifp, &af, sizeof(af), m);
550 return (ifp->if_transmit(ifp, m));
551 drop:
552 m_freem(m);
553 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
554 return (error);
555 }
556
557 static int
558 me_transmit(struct ifnet *ifp, struct mbuf *m)
559 {
560 ME_RLOCK_TRACKER;
561 struct mobhdr mh;
562 struct me_softc *sc;
563 struct ip *ip;
564 int error, hlen, plen;
565
566 sc = ifp->if_softc;
567 if (sc == NULL) {
568 error = ENETDOWN;
569 m_freem(m);
570 goto drop;
571 }
572 if (m->m_len < sizeof(struct ip))
573 m = m_pullup(m, sizeof(struct ip));
574 if (m == NULL) {
575 error = ENOBUFS;
576 goto drop;
577 }
578 ip = mtod(m, struct ip *);
579 /* Fragmented datagramms shouldn't be encapsulated */
580 if (ip->ip_off & htons(IP_MF | IP_OFFMASK)) {
581 error = EINVAL;
582 m_freem(m);
583 goto drop;
584 }
585 mh.mob_proto = ip->ip_p;
586 mh.mob_src = ip->ip_src;
587 mh.mob_dst = ip->ip_dst;
588 ME_RLOCK(sc);
589 if (!ME_READY(sc)) {
590 ME_RUNLOCK(sc);
591 error = ENETDOWN;
592 m_freem(m);
593 goto drop;
594 }
595 if (in_hosteq(sc->me_src, ip->ip_src)) {
596 hlen = sizeof(struct mobhdr) - sizeof(struct in_addr);
597 mh.mob_flags = 0;
598 } else {
599 hlen = sizeof(struct mobhdr);
600 mh.mob_flags = MOB_FLAGS_SP;
601 }
602 plen = m->m_pkthdr.len;
603 ip->ip_src = sc->me_src;
604 ip->ip_dst = sc->me_dst;
605 M_SETFIB(m, sc->me_fibnum);
606 ME_RUNLOCK(sc);
607 M_PREPEND(m, hlen, M_NOWAIT);
608 if (m == NULL) {
609 error = ENOBUFS;
610 goto drop;
611 }
612 if (m->m_len < sizeof(struct ip) + hlen)
613 m = m_pullup(m, sizeof(struct ip) + hlen);
614 if (m == NULL) {
615 error = ENOBUFS;
616 goto drop;
617 }
618 memmove(mtod(m, void *), mtodo(m, hlen), sizeof(struct ip));
619 ip = mtod(m, struct ip *);
620 ip->ip_len = htons(m->m_pkthdr.len);
621 ip->ip_p = IPPROTO_MOBILE;
622 ip->ip_sum = 0;
623 mh.mob_csum = 0;
624 mh.mob_csum = me_in_cksum((uint16_t *)&mh, hlen / sizeof(uint16_t));
625 bcopy(&mh, mtodo(m, sizeof(struct ip)), hlen);
626 error = ip_output(m, NULL, NULL, IP_FORWARDING, NULL, NULL);
627 drop:
628 if (error)
629 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
630 else {
631 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
632 if_inc_counter(ifp, IFCOUNTER_OBYTES, plen);
633 }
634 return (error);
635 }
636
637 static void
638 me_qflush(struct ifnet *ifp __unused)
639 {
640
641 }
642
643 static int
644 memodevent(module_t mod, int type, void *data)
645 {
646
647 switch (type) {
648 case MOD_LOAD:
649 case MOD_UNLOAD:
650 break;
651 default:
652 return (EOPNOTSUPP);
653 }
654 return (0);
655 }
656
657 static moduledata_t me_mod = {
658 "if_me",
659 memodevent,
660 0
661 };
662
663 DECLARE_MODULE(if_me, me_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
664 MODULE_VERSION(if_me, 1);
Cache object: 4e941260cc6ce7eea6ec60a5876828e7
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