xref: /dragonfly/sys/netinet6/raw_ip6.c (revision b272101a)
1 /*
2  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
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. Neither the name of the project 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 PROJECT 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 PROJECT 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  * $FreeBSD: src/sys/netinet6/raw_ip6.c,v 1.7.2.7 2003/01/24 05:11:35 sam Exp $
30  */
31 
32 /*
33  * Copyright (c) 1982, 1986, 1988, 1993
34  *	The Regents of the University of California.  All rights reserved.
35  *
36  * Redistribution and use in source and binary forms, with or without
37  * modification, are permitted provided that the following conditions
38  * are met:
39  * 1. Redistributions of source code must retain the above copyright
40  *    notice, this list of conditions and the following disclaimer.
41  * 2. Redistributions in binary form must reproduce the above copyright
42  *    notice, this list of conditions and the following disclaimer in the
43  *    documentation and/or other materials provided with the distribution.
44  * 3. Neither the name of the University nor the names of its contributors
45  *    may be used to endorse or promote products derived from this software
46  *    without specific prior written permission.
47  *
48  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
49  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
50  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
51  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
52  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
53  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
54  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
55  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
56  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
57  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
58  * SUCH DAMAGE.
59  *
60  *	@(#)raw_ip.c	8.2 (Berkeley) 1/4/94
61  */
62 
63 #include "opt_inet6.h"
64 
65 #include <sys/param.h>
66 #include <sys/malloc.h>
67 #include <sys/proc.h>
68 #include <sys/caps.h>
69 #include <sys/mbuf.h>
70 #include <sys/socket.h>
71 #include <sys/jail.h>
72 #include <sys/protosw.h>
73 #include <sys/socketvar.h>
74 #include <sys/errno.h>
75 #include <sys/systm.h>
76 
77 #include <sys/thread2.h>
78 #include <sys/socketvar2.h>
79 #include <sys/msgport2.h>
80 
81 #include <net/if.h>
82 #include <net/route.h>
83 #include <net/if_types.h>
84 
85 #include <netinet/in.h>
86 #include <netinet/in_var.h>
87 #include <netinet/in_systm.h>
88 #include <netinet/ip6.h>
89 #include <netinet6/ip6_var.h>
90 #include <netinet6/ip6_mroute.h>
91 #include <netinet/icmp6.h>
92 #include <netinet/in_pcb.h>
93 #include <netinet6/in6_pcb.h>
94 #include <netinet6/nd6.h>
95 #include <netinet6/ip6protosw.h>
96 #ifdef ENABLE_DEFAULT_SCOPE
97 #include <netinet6/scope6_var.h>
98 #endif
99 #include <netinet6/raw_ip6.h>
100 
101 #include <machine/stdarg.h>
102 
103 #define	satosin6(sa)	((struct sockaddr_in6 *)(sa))
104 #define	ifatoia6(ifa)	((struct in6_ifaddr *)(ifa))
105 
106 /*
107  * Raw interface to IP6 protocol.
108  */
109 
110 extern struct	inpcbinfo ripcbinfo;
111 extern u_long	rip_sendspace;
112 extern u_long	rip_recvspace;
113 
114 struct rip6stat rip6stat;
115 
116 /*
117  * Setup generic address and protocol structures
118  * for raw_input routine, then pass them along with
119  * mbuf chain.
120  */
121 int
rip6_input(struct mbuf ** mp,int * offp,int proto)122 rip6_input(struct mbuf **mp, int *offp, int proto)
123 {
124 	struct mbuf *m = *mp;
125 	struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
126 	struct inpcb *in6p;
127 	struct inpcb *last = NULL;
128 	struct mbuf *opts = NULL;
129 	struct sockaddr_in6 rip6src;
130 
131 	rip6stat.rip6s_ipackets++;
132 
133 	init_sin6(&rip6src, m); /* general init */
134 
135 	LIST_FOREACH(in6p, &ripcbinfo.pcblisthead, inp_list) {
136 		if (in6p->in6p_flags & INP_PLACEMARKER)
137 			continue;
138 		if (!INP_ISIPV6(in6p))
139 			continue;
140 		if (in6p->in6p_ip6_nxt &&
141 		    in6p->in6p_ip6_nxt != proto)
142 			continue;
143 		if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) &&
144 		    !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst))
145 			continue;
146 		if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) &&
147 		    !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src))
148 			continue;
149 		if (in6p->in6p_cksum != -1) {
150 			rip6stat.rip6s_isum++;
151 			if (in6_cksum(m, ip6->ip6_nxt, *offp,
152 			    m->m_pkthdr.len - *offp)) {
153 				rip6stat.rip6s_badsum++;
154 				continue;
155 			}
156 		}
157 		if (last) {
158 			struct mbuf *n;
159 
160 			n = m_copym(m, 0, M_COPYALL, M_NOWAIT);
161 			if (n != NULL) {
162 				struct socket *so;
163 
164 				so = last->in6p_socket;
165 				if ((last->in6p_flags & IN6P_CONTROLOPTS) ||
166 				    (so->so_options & SO_TIMESTAMP)) {
167 					ip6_savecontrol(last, &opts, ip6, n);
168 				}
169 				/* strip intermediate headers */
170 				m_adj(n, *offp);
171 				lwkt_gettoken(&so->so_rcv.ssb_token);
172 				if (ssb_appendaddr(&so->so_rcv,
173 						(struct sockaddr *)&rip6src,
174 						 n, opts) == 0) {
175 					m_freem(n);
176 					if (opts)
177 						m_freem(opts);
178 					rip6stat.rip6s_fullsock++;
179 					soroverflow(so);
180 				} else {
181 					sorwakeup(so);
182 				}
183 				lwkt_reltoken(&so->so_rcv.ssb_token);
184 				opts = NULL;
185 			}
186 		}
187 		last = in6p;
188 	}
189 	if (last) {
190 		struct socket *so;
191 
192 		so = last->in6p_socket;
193 		if ((last->in6p_flags & IN6P_CONTROLOPTS) ||
194 		    (so->so_options & SO_TIMESTAMP)) {
195 			ip6_savecontrol(last, &opts, ip6, m);
196 		}
197 		/* strip intermediate headers */
198 		m_adj(m, *offp);
199 		lwkt_gettoken(&so->so_rcv.ssb_token);
200 		if (ssb_appendaddr(&so->so_rcv, (struct sockaddr *)&rip6src,
201 				   m, opts) == 0) {
202 			m_freem(m);
203 			if (opts)
204 				m_freem(opts);
205 			rip6stat.rip6s_fullsock++;
206 			soroverflow(so);
207 		} else {
208 			sorwakeup(so);
209 		}
210 		lwkt_reltoken(&so->so_rcv.ssb_token);
211 	} else {
212 		rip6stat.rip6s_nosock++;
213 		if (m->m_flags & M_MCAST)
214 			rip6stat.rip6s_nosockmcast++;
215 		if (proto == IPPROTO_NONE)
216 			m_freem(m);
217 		else {
218 			char *prvnxtp = ip6_get_prevhdr(m, *offp); /* XXX */
219 			icmp6_error(m, ICMP6_PARAM_PROB,
220 				    ICMP6_PARAMPROB_NEXTHEADER,
221 				    prvnxtp - mtod(m, char *));
222 		}
223 		ip6stat.ip6s_delivered--;
224 	}
225 	return IPPROTO_DONE;
226 }
227 
228 void
rip6_ctlinput(netmsg_t msg)229 rip6_ctlinput(netmsg_t msg)
230 {
231 	int cmd = msg->ctlinput.nm_cmd;
232 	struct sockaddr *sa = msg->ctlinput.nm_arg;
233 	void *d = msg->ctlinput.nm_extra;
234 	struct ip6ctlparam *ip6cp = NULL;
235 	const struct sockaddr_in6 *sa6_src = NULL;
236 	inp_notify_t notify = in6_rtchange;
237 
238 	if (sa->sa_family != AF_INET6 ||
239 	    sa->sa_len != sizeof(struct sockaddr_in6))
240 		goto out;
241 
242 	if ((unsigned)cmd >= PRC_NCMDS)
243 		goto out;
244 	if (PRC_IS_REDIRECT(cmd))
245 		notify = in6_rtchange, d = NULL;
246 	else if (cmd == PRC_HOSTDEAD)
247 		d = NULL;
248 	else if (inet6ctlerrmap[cmd] == 0)
249 		goto out;
250 
251 	/* if the parameter is from icmp6, decode it. */
252 	if (d != NULL) {
253 		ip6cp = (struct ip6ctlparam *)d;
254 		sa6_src = ip6cp->ip6c_src;
255 	} else {
256 		sa6_src = &sa6_any;
257 	}
258 
259 	in6_pcbnotify(&ripcbinfo, sa, 0,
260 		      (const struct sockaddr *)sa6_src, 0, cmd, 0, notify);
261 out:
262 	lwkt_replymsg(&msg->ctlinput.base.lmsg, 0);
263 }
264 
265 /*
266  * Generate IPv6 header and pass packet to ip6_output.
267  * Tack on options user may have setup with control call.
268  */
269 int
rip6_output(struct mbuf * m,struct socket * so,...)270 rip6_output(struct mbuf *m, struct socket *so, ...)
271 {
272 	struct sockaddr_in6 *dstsock;
273 	struct mbuf *control;
274 	struct in6_addr *dst;
275 	struct ip6_hdr *ip6;
276 	struct inpcb *in6p;
277 	u_int	plen = m->m_pkthdr.len;
278 	int error = 0;
279 	struct ip6_pktopts opt, *optp = NULL;
280 	struct ifnet *oifp = NULL;
281 	int type = 0, code = 0;		/* for ICMPv6 output statistics only */
282 	int priv = 0;
283 	__va_list ap;
284 
285 	__va_start(ap, so);
286 	dstsock = __va_arg(ap, struct sockaddr_in6 *);
287 	control = __va_arg(ap, struct mbuf *);
288 	__va_end(ap);
289 
290 	if (IN6_IS_ADDR_V4MAPPED(&dstsock->sin6_addr)) {
291 		error = EADDRNOTAVAIL;
292 		goto bad;
293 	}
294 
295 	in6p = so->so_pcb;
296 
297 	priv = 0;
298 	if (so->so_cred->cr_uid == 0)
299 		priv = 1;
300 	dst = &dstsock->sin6_addr;
301 	if (control) {
302 		if ((error = ip6_setpktoptions(control, &opt,
303 		    in6p->in6p_outputopts,
304 		    so->so_proto->pr_protocol, priv)) != 0)
305 			goto bad;
306 		optp = &opt;
307 	} else
308 		optp = in6p->in6p_outputopts;
309 
310 	/*
311 	 * For an ICMPv6 packet, we should know its type and code
312 	 * to update statistics.
313 	 */
314 	if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) {
315 		struct icmp6_hdr *icmp6;
316 		if (m->m_len < sizeof(struct icmp6_hdr) &&
317 		    (m = m_pullup(m, sizeof(struct icmp6_hdr))) == NULL) {
318 			error = ENOBUFS;
319 			goto bad;
320 		}
321 		icmp6 = mtod(m, struct icmp6_hdr *);
322 		type = icmp6->icmp6_type;
323 		code = icmp6->icmp6_code;
324 	}
325 
326 	M_PREPEND(m, sizeof(*ip6), M_WAITOK);
327 	ip6 = mtod(m, struct ip6_hdr *);
328 
329 	/*
330 	 * Next header might not be ICMP6 but use its pseudo header anyway.
331 	 */
332 	ip6->ip6_dst = *dst;
333 
334 	/*
335 	 * If the scope of the destination is link-local, embed the interface
336 	 * index in the address.
337 	 *
338 	 * XXX advanced-api value overrides sin6_scope_id
339 	 */
340 	if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) {
341 		struct in6_pktinfo *pi;
342 
343 		/*
344 		 * XXX Boundary check is assumed to be already done in
345 		 * ip6_setpktoptions().
346 		 */
347 		if (optp && (pi = optp->ip6po_pktinfo) && pi->ipi6_ifindex) {
348 			ip6->ip6_dst.s6_addr16[1] = htons(pi->ipi6_ifindex);
349 			oifp = ifindex2ifnet[pi->ipi6_ifindex];
350 		} else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) &&
351 			 in6p->in6p_moptions &&
352 			 in6p->in6p_moptions->im6o_multicast_ifp) {
353 			oifp = in6p->in6p_moptions->im6o_multicast_ifp;
354 			ip6->ip6_dst.s6_addr16[1] = htons(oifp->if_index);
355 		} else if (dstsock->sin6_scope_id) {
356 			/* boundary check */
357 			if (dstsock->sin6_scope_id < 0 ||
358 			    if_index < dstsock->sin6_scope_id) {
359 				error = ENXIO;  /* XXX EINVAL? */
360 				goto bad;
361 			}
362 			ip6->ip6_dst.s6_addr16[1] =
363 			    htons(dstsock->sin6_scope_id & 0xffff); /* XXX */
364 		}
365 	}
366 
367 	/*
368 	 * Source address selection.
369 	 */
370 	{
371 		struct in6_addr *in6a;
372 
373 		if ((in6a = in6_selectsrc(dstsock, optp, in6p->in6p_moptions,
374 		    &in6p->in6p_route, &in6p->in6p_laddr, &error, NULL))
375 		    == NULL) {
376 			if (error == 0)
377 				error = EADDRNOTAVAIL;
378 			goto bad;
379 		}
380 		ip6->ip6_src = *in6a;
381 		if (in6p->in6p_route.ro_rt)
382 			oifp = ifindex2ifnet[in6p->in6p_route.ro_rt->rt_ifp->if_index];
383 	}
384 	ip6->ip6_flow = (ip6->ip6_flow & ~IPV6_FLOWINFO_MASK) |
385 		(in6p->in6p_flowinfo & IPV6_FLOWINFO_MASK);
386 	ip6->ip6_vfc = (ip6->ip6_vfc & ~IPV6_VERSION_MASK) |
387 		(IPV6_VERSION & IPV6_VERSION_MASK);
388 	/* ip6_plen will be filled in ip6_output, so not fill it here. */
389 	ip6->ip6_nxt = in6p->in6p_ip6_nxt;
390 	ip6->ip6_hlim = in6_selecthlim(in6p, oifp);
391 
392 	if (so->so_proto->pr_protocol == IPPROTO_ICMPV6 ||
393 	    in6p->in6p_cksum != -1) {
394 		struct mbuf *n;
395 		int off;
396 		u_int16_t *p;
397 
398 		/* compute checksum */
399 		if (so->so_proto->pr_protocol == IPPROTO_ICMPV6)
400 			off = offsetof(struct icmp6_hdr, icmp6_cksum);
401 		else
402 			off = in6p->in6p_cksum;
403 		if (plen < off + 1) {
404 			error = EINVAL;
405 			goto bad;
406 		}
407 		off += sizeof(struct ip6_hdr);
408 
409 		n = m;
410 		while (n && n->m_len <= off) {
411 			off -= n->m_len;
412 			n = n->m_next;
413 		}
414 		if (!n)
415 			goto bad;
416 		p = (u_int16_t *)(mtod(n, caddr_t) + off);
417 		*p = 0;
418 		*p = in6_cksum(m, ip6->ip6_nxt, sizeof(*ip6), plen);
419 	}
420 
421 	error = ip6_output(m, optp, &in6p->in6p_route, 0,
422 			   in6p->in6p_moptions, &oifp, in6p);
423 	if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) {
424 		if (oifp)
425 			icmp6_ifoutstat_inc(oifp, type, code);
426 		icmp6stat.icp6s_outhist[type]++;
427 	} else
428 		rip6stat.rip6s_opackets++;
429 
430 	goto freectl;
431 
432 bad:
433 	if (m)
434 		m_freem(m);
435 
436 freectl:
437 	if (optp == &opt && optp->ip6po_rthdr && optp->ip6po_route.ro_rt)
438 		RTFREE(optp->ip6po_route.ro_rt);
439 	if (control) {
440 		if (optp == &opt)
441 			ip6_clearpktopts(optp, -1);
442 		m_freem(control);
443 	}
444 	return (error);
445 }
446 
447 /*
448  * Raw IPv6 socket option processing.
449  */
450 void
rip6_ctloutput(netmsg_t msg)451 rip6_ctloutput(netmsg_t msg)
452 {
453 	struct socket *so = msg->ctloutput.base.nm_so;
454 	struct sockopt *sopt = msg->ctloutput.nm_sopt;
455 	int error;
456 
457 	if (sopt->sopt_level == IPPROTO_ICMPV6) {
458 		/*
459 		 * XXX: is it better to call icmp6_ctloutput() directly
460 		 * from protosw?
461 		 */
462 		icmp6_ctloutput(msg);
463 		/* msg invalid now */
464 		return;
465 	}
466 	if (sopt->sopt_level != IPPROTO_IPV6) {
467 		error = EINVAL;
468 		goto out;
469 	}
470 
471 	error = 0;
472 
473 	switch (sopt->sopt_dir) {
474 	case SOPT_GET:
475 		switch (sopt->sopt_name) {
476 		case MRT6_INIT:
477 		case MRT6_DONE:
478 		case MRT6_ADD_MIF:
479 		case MRT6_DEL_MIF:
480 		case MRT6_ADD_MFC:
481 		case MRT6_DEL_MFC:
482 		case MRT6_PIM:
483 			error = ip6_mrouter_get(so, sopt);
484 			break;
485 		case IPV6_CHECKSUM:
486 			error = ip6_raw_ctloutput(so, sopt);
487 			break;
488 		default:
489 			error = ip6_ctloutput(so, sopt);
490 			break;
491 		}
492 		break;
493 
494 	case SOPT_SET:
495 		switch (sopt->sopt_name) {
496 		case MRT6_INIT:
497 		case MRT6_DONE:
498 		case MRT6_ADD_MIF:
499 		case MRT6_DEL_MIF:
500 		case MRT6_ADD_MFC:
501 		case MRT6_DEL_MFC:
502 		case MRT6_PIM:
503 			error = ip6_mrouter_set(so, sopt);
504 			break;
505 		case IPV6_CHECKSUM:
506 			error = ip6_raw_ctloutput(so, sopt);
507 			break;
508 		default:
509 			error = ip6_ctloutput(so, sopt);
510 			break;
511 		}
512 		break;
513 	}
514 out:
515 	lwkt_replymsg(&msg->ctloutput.base.lmsg, error);
516 }
517 
518 static void
rip6_attach(netmsg_t msg)519 rip6_attach(netmsg_t msg)
520 {
521 	struct socket *so = msg->attach.base.nm_so;
522 	int proto = msg->attach.nm_proto;
523 	struct pru_attach_info *ai = msg->attach.nm_ai;
524 	struct inpcb *inp;
525 	int error;
526 
527 	inp = so->so_pcb;
528 	if (inp)
529 		panic("rip6_attach");
530 	error = caps_priv_check(ai->p_ucred,
531 				SYSCAP_NONET_RAW | __SYSCAP_NULLCRED);
532 	if (error)
533 		goto out;
534 
535 	error = soreserve(so, rip_sendspace, rip_recvspace, ai->sb_rlimit);
536 	if (error)
537 		goto out;
538 	crit_enter();
539 	error = in_pcballoc(so, &ripcbinfo);
540 	crit_exit();
541 	if (error)
542 		goto out;
543 	inp = (struct inpcb *)so->so_pcb;
544 	inp->in6p_ip6_nxt = (long)proto;
545 	inp->in6p_hops = -1;	/* use kernel default */
546 	inp->in6p_cksum = -1;
547 	inp->in6p_icmp6filt = kmalloc(sizeof(struct icmp6_filter), M_PCB,
548 				      M_NOWAIT);
549 	if (inp->in6p_icmp6filt != NULL)
550 		ICMP6_FILTER_SETPASSALL(inp->in6p_icmp6filt);
551 	error = 0;
552 out:
553 	lwkt_replymsg(&msg->attach.base.lmsg, error);
554 }
555 
556 static void
rip6_detach(netmsg_t msg)557 rip6_detach(netmsg_t msg)
558 {
559 	struct socket *so = msg->detach.base.nm_so;
560 	struct inpcb *inp;
561 
562 	inp = so->so_pcb;
563 	if (inp == NULL)
564 		panic("rip6_detach");
565 	/* xxx: RSVP */
566 	if (so == ip6_mrouter)
567 		ip6_mrouter_done();
568 	if (inp->in6p_icmp6filt) {
569 		kfree(inp->in6p_icmp6filt, M_PCB);
570 		inp->in6p_icmp6filt = NULL;
571 	}
572 	in6_pcbdetach(inp);
573 	lwkt_replymsg(&msg->detach.base.lmsg, 0);
574 }
575 
576 /*
577  * NOTE: (so) is referenced from soabort*() and netmsg_pru_abort()
578  *	 will sofree() it when we return.
579  */
580 static void
rip6_abort(netmsg_t msg)581 rip6_abort(netmsg_t msg)
582 {
583 	soisdisconnected(msg->abort.base.nm_so);
584 	rip6_detach(msg);
585 	/* msg invalid now */
586 }
587 
588 static void
rip6_disconnect(netmsg_t msg)589 rip6_disconnect(netmsg_t msg)
590 {
591 	struct socket *so = msg->disconnect.base.nm_so;
592 	struct inpcb *inp = so->so_pcb;
593 
594 	if (so->so_state & SS_ISCONNECTED) {
595 		inp->in6p_faddr = kin6addr_any;
596 		soreference(so);
597 		rip6_abort(msg);
598 		/* msg invalid now */
599 		sofree(so);
600 		return;
601 	}
602 	lwkt_replymsg(&msg->disconnect.base.lmsg, ENOTCONN);
603 }
604 
605 static void
rip6_bind(netmsg_t msg)606 rip6_bind(netmsg_t msg)
607 {
608 	struct socket *so = msg->bind.base.nm_so;
609 	struct sockaddr *nam = msg->bind.nm_nam;
610 	struct inpcb *inp = so->so_pcb;
611 	struct sockaddr_in6 *addr = (struct sockaddr_in6 *)nam;
612 	struct ifaddr *ia = NULL;
613 	int error;
614 
615 	if (nam->sa_len != sizeof(*addr)) {
616 		error = EINVAL;
617 		goto out;
618 	}
619 	if (ifnet_array_isempty() || addr->sin6_family != AF_INET6) {
620 		error = EADDRNOTAVAIL;
621 		goto out;
622 	}
623 	if (IN6_IS_ADDR_V4MAPPED(&addr->sin6_addr)) {
624 		error = EADDRNOTAVAIL;
625 		goto out;
626 	}
627 #ifdef ENABLE_DEFAULT_SCOPE
628 	if (addr->sin6_scope_id == 0) {	/* not change if specified  */
629 		addr->sin6_scope_id = scope6_addr2default(&addr->sin6_addr);
630 	}
631 #endif
632 	if (!IN6_IS_ADDR_UNSPECIFIED(&addr->sin6_addr) &&
633 	    (ia = ifa_ifwithaddr((struct sockaddr *)addr)) == NULL) {
634 		error = EADDRNOTAVAIL;
635 		goto out;
636 	}
637 	if (ia &&
638 	    ((struct in6_ifaddr *)ia)->ia6_flags &
639 	    (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|
640 	     IN6_IFF_DETACHED|IN6_IFF_DEPRECATED)) {
641 		error = EADDRNOTAVAIL;
642 		goto out;
643 	}
644 	inp->in6p_laddr = addr->sin6_addr;
645 	error = 0;
646 out:
647 	lwkt_replymsg(&msg->bind.base.lmsg, error);
648 }
649 
650 static void
rip6_connect(netmsg_t msg)651 rip6_connect(netmsg_t msg)
652 {
653 	struct socket *so = msg->connect.base.nm_so;
654 	struct sockaddr *nam = msg->connect.nm_nam;
655 	struct inpcb *inp = so->so_pcb;
656 	struct sockaddr_in6 *addr = (struct sockaddr_in6 *)nam;
657 	struct in6_addr *in6a = NULL;
658 	int error = 0;
659 #ifdef ENABLE_DEFAULT_SCOPE
660 	struct sockaddr_in6 tmp;
661 #endif
662 
663 	if (nam->sa_len != sizeof(*addr)) {
664 		error = EINVAL;
665 		goto out;
666 	}
667 	if (ifnet_array_isempty()) {
668 		error = EADDRNOTAVAIL;
669 		goto out;
670 	}
671 	if (addr->sin6_family != AF_INET6) {
672 		error = EAFNOSUPPORT;
673 		goto out;
674 	}
675 	if (IN6_IS_ADDR_V4MAPPED(&addr->sin6_addr)) {
676 		error = EADDRNOTAVAIL;
677 		goto out;
678 	}
679 #ifdef ENABLE_DEFAULT_SCOPE
680 	if (addr->sin6_scope_id == 0) {	/* not change if specified  */
681 		/* avoid overwrites */
682 		tmp = *addr;
683 		addr = &tmp;
684 		addr->sin6_scope_id = scope6_addr2default(&addr->sin6_addr);
685 	}
686 #endif
687 	/* Source address selection. XXX: need pcblookup? */
688 	in6a = in6_selectsrc(addr, inp->in6p_outputopts,
689 			     inp->in6p_moptions, &inp->in6p_route,
690 			     &inp->in6p_laddr, &error, NULL);
691 	if (in6a == NULL) {
692 		if (error == 0)
693 			error = EADDRNOTAVAIL;
694 	} else {
695 		inp->in6p_laddr = *in6a;
696 		inp->in6p_faddr = addr->sin6_addr;
697 		soisconnected(so);
698 		error = 0;
699 	}
700 out:
701 	lwkt_replymsg(&msg->connect.base.lmsg, error);
702 }
703 
704 static void
rip6_shutdown(netmsg_t msg)705 rip6_shutdown(netmsg_t msg)
706 {
707 	socantsendmore(msg->shutdown.base.nm_so);
708 	lwkt_replymsg(&msg->shutdown.base.lmsg, 0);
709 }
710 
711 static void
rip6_send(netmsg_t msg)712 rip6_send(netmsg_t msg)
713 {
714 	struct socket *so = msg->send.base.nm_so;
715 	struct mbuf *m = msg->send.nm_m;
716 	struct sockaddr *nam = msg->send.nm_addr;
717 	struct mbuf *control = msg->send.nm_control;
718 	struct inpcb *inp = so->so_pcb;
719 	struct sockaddr_in6 tmp;
720 	struct sockaddr_in6 *dst;
721 	int error;
722 
723 	/* always copy sockaddr to avoid overwrites */
724 	if (so->so_state & SS_ISCONNECTED) {
725 		if (nam) {
726 			m_freem(m);
727 			error = EISCONN;
728 			goto out;
729 		}
730 		/* XXX */
731 		bzero(&tmp, sizeof(tmp));
732 		tmp.sin6_family = AF_INET6;
733 		tmp.sin6_len = sizeof(struct sockaddr_in6);
734 		bcopy(&inp->in6p_faddr, &tmp.sin6_addr,
735 		      sizeof(struct in6_addr));
736 		dst = &tmp;
737 	} else {
738 		if (nam == NULL) {
739 			m_freem(m);
740 			error = ENOTCONN;
741 			goto out;
742 		}
743 		tmp = *(struct sockaddr_in6 *)nam;
744 		dst = &tmp;
745 	}
746 #ifdef ENABLE_DEFAULT_SCOPE
747 	if (dst->sin6_scope_id == 0) {	/* not change if specified  */
748 		dst->sin6_scope_id = scope6_addr2default(&dst->sin6_addr);
749 	}
750 #endif
751 	error = rip6_output(m, so, dst, control);
752 out:
753 	lwkt_replymsg(&msg->send.base.lmsg, error);
754 }
755 
756 struct pr_usrreqs rip6_usrreqs = {
757 	.pru_abort = rip6_abort,
758 	.pru_accept = pr_generic_notsupp,
759 	.pru_attach = rip6_attach,
760 	.pru_bind = rip6_bind,
761 	.pru_connect = rip6_connect,
762 	.pru_connect2 = pr_generic_notsupp,
763 	.pru_control = in6_control_dispatch,
764 	.pru_detach = rip6_detach,
765 	.pru_disconnect = rip6_disconnect,
766 	.pru_listen = pr_generic_notsupp,
767 	.pru_peeraddr = in6_setpeeraddr_dispatch,
768 	.pru_rcvd = pr_generic_notsupp,
769 	.pru_rcvoob = pr_generic_notsupp,
770 	.pru_send = rip6_send,
771 	.pru_sense = pru_sense_null,
772 	.pru_shutdown = rip6_shutdown,
773 	.pru_sockaddr = in6_setsockaddr_dispatch,
774 	.pru_sosend = sosend,
775 	.pru_soreceive = soreceive
776 };
777