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4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
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8 * modification, are permitted provided that the following conditions
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38 * modification, are permitted provided that the following conditions
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46 * may be used to endorse or promote products derived from this software
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51 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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58 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
61 * @(#)raw_ip.c 8.2 (Berkeley) 1/4/94
64 #include <sys/cdefs.h>
65 __FBSDID("$FreeBSD$");
67 #include "opt_ipsec.h"
68 #include "opt_inet6.h"
70 #include <sys/param.h>
71 #include <sys/errno.h>
73 #include <sys/kernel.h>
75 #include <sys/malloc.h>
79 #include <sys/protosw.h>
80 #include <sys/signalvar.h>
81 #include <sys/socket.h>
82 #include <sys/socketvar.h>
84 #include <sys/syslog.h>
87 #include <net/if_var.h>
88 #include <net/if_types.h>
89 #include <net/route.h>
92 #include <netinet/in.h>
93 #include <netinet/in_var.h>
94 #include <netinet/in_systm.h>
95 #include <netinet/in_pcb.h>
97 #include <netinet/icmp6.h>
98 #include <netinet/ip6.h>
99 #include <netinet/ip_var.h>
100 #include <netinet6/ip6protosw.h>
101 #include <netinet6/ip6_mroute.h>
102 #include <netinet6/in6_pcb.h>
103 #include <netinet6/ip6_var.h>
104 #include <netinet6/nd6.h>
105 #include <netinet6/raw_ip6.h>
106 #include <netinet6/scope6_var.h>
107 #include <netinet6/send.h>
109 #include <netipsec/ipsec_support.h>
111 #include <machine/stdarg.h>
113 #define satosin6(sa) ((struct sockaddr_in6 *)(sa))
114 #define ifatoia6(ifa) ((struct in6_ifaddr *)(ifa))
117 * Raw interface to IP6 protocol.
120 VNET_DECLARE(struct inpcbhead, ripcb);
121 VNET_DECLARE(struct inpcbinfo, ripcbinfo);
122 #define V_ripcb VNET(ripcb)
123 #define V_ripcbinfo VNET(ripcbinfo)
125 extern u_long rip_sendspace;
126 extern u_long rip_recvspace;
128 VNET_PCPUSTAT_DEFINE(struct rip6stat, rip6stat);
129 VNET_PCPUSTAT_SYSINIT(rip6stat);
132 VNET_PCPUSTAT_SYSUNINIT(rip6stat);
136 * Hooks for multicast routing. They all default to NULL, so leave them not
137 * initialized and rely on BSS being set to 0.
141 * The socket used to communicate with the multicast routing daemon.
143 VNET_DEFINE(struct socket *, ip6_mrouter);
146 * The various mrouter functions.
148 int (*ip6_mrouter_set)(struct socket *, struct sockopt *);
149 int (*ip6_mrouter_get)(struct socket *, struct sockopt *);
150 int (*ip6_mrouter_done)(void);
151 int (*ip6_mforward)(struct ip6_hdr *, struct ifnet *, struct mbuf *);
152 int (*mrt6_ioctl)(u_long, caddr_t);
155 * Setup generic address and protocol structures for raw_input routine, then
156 * pass them along with mbuf chain.
159 rip6_input(struct mbuf **mp, int *offp, int proto)
162 struct mbuf *m = *mp;
163 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
165 struct inpcb *last = NULL;
166 struct mbuf *opts = NULL;
167 struct sockaddr_in6 fromsa;
169 RIP6STAT_INC(rip6s_ipackets);
171 init_sin6(&fromsa, m, 0); /* general init */
173 ifp = m->m_pkthdr.rcvif;
175 INP_INFO_RLOCK(&V_ripcbinfo);
176 LIST_FOREACH(in6p, &V_ripcb, inp_list) {
177 /* XXX inp locking */
178 if ((in6p->inp_vflag & INP_IPV6) == 0)
180 if (in6p->inp_ip_p &&
181 in6p->inp_ip_p != proto)
183 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) &&
184 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst))
186 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) &&
187 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src))
189 if (jailed_without_vnet(in6p->inp_cred)) {
191 * Allow raw socket in jail to receive multicast;
192 * assume process had PRIV_NETINET_RAW at attach,
193 * and fall through into normal filter path if so.
195 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) &&
196 prison_check_ip6(in6p->inp_cred,
201 if (in6p->in6p_cksum != -1) {
202 RIP6STAT_INC(rip6s_isum);
203 if (in6_cksum(m, proto, *offp,
204 m->m_pkthdr.len - *offp)) {
206 RIP6STAT_INC(rip6s_badsum);
211 * If this raw socket has multicast state, and we
212 * have received a multicast, check if this socket
213 * should receive it, as multicast filtering is now
214 * the responsibility of the transport layer.
216 if (in6p->in6p_moptions &&
217 IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
219 * If the incoming datagram is for MLD, allow it
220 * through unconditionally to the raw socket.
222 * Use the M_RTALERT_MLD flag to check for MLD
223 * traffic without having to inspect the mbuf chain
224 * more deeply, as all MLDv1/v2 host messages MUST
225 * contain the Router Alert option.
227 * In the case of MLDv1, we may not have explicitly
228 * joined the group, and may have set IFF_ALLMULTI
229 * on the interface. im6o_mc_filter() may discard
230 * control traffic we actually need to see.
232 * Userland multicast routing daemons should continue
233 * filter the control traffic appropriately.
237 blocked = MCAST_PASS;
238 if ((m->m_flags & M_RTALERT_MLD) == 0) {
239 struct sockaddr_in6 mcaddr;
241 bzero(&mcaddr, sizeof(struct sockaddr_in6));
242 mcaddr.sin6_len = sizeof(struct sockaddr_in6);
243 mcaddr.sin6_family = AF_INET6;
244 mcaddr.sin6_addr = ip6->ip6_dst;
246 blocked = im6o_mc_filter(in6p->in6p_moptions,
248 (struct sockaddr *)&mcaddr,
249 (struct sockaddr *)&fromsa);
251 if (blocked != MCAST_PASS) {
252 IP6STAT_INC(ip6s_notmember);
258 struct mbuf *n = m_copym(m, 0, M_COPYALL, M_NOWAIT);
260 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
262 * Check AH/ESP integrity.
264 if (IPSEC_ENABLED(ipv6)) {
266 IPSEC_CHECK_POLICY(ipv6, n, last) != 0) {
268 /* Do not inject data into pcb. */
274 if (last->inp_flags & INP_CONTROLOPTS ||
275 last->inp_socket->so_options & SO_TIMESTAMP)
276 ip6_savecontrol(last, n, &opts);
277 /* strip intermediate headers */
279 if (sbappendaddr(&last->inp_socket->so_rcv,
280 (struct sockaddr *)&fromsa,
285 RIP6STAT_INC(rip6s_fullsock);
287 sorwakeup(last->inp_socket);
294 INP_INFO_RUNLOCK(&V_ripcbinfo);
295 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
297 * Check AH/ESP integrity.
299 if (IPSEC_ENABLED(ipv6) && last != NULL &&
300 IPSEC_CHECK_POLICY(ipv6, m, last) != 0) {
302 IP6STAT_DEC(ip6s_delivered);
303 /* Do not inject data into pcb. */
308 if (last->inp_flags & INP_CONTROLOPTS ||
309 last->inp_socket->so_options & SO_TIMESTAMP)
310 ip6_savecontrol(last, m, &opts);
311 /* Strip intermediate headers. */
313 if (sbappendaddr(&last->inp_socket->so_rcv,
314 (struct sockaddr *)&fromsa, m, opts) == 0) {
318 RIP6STAT_INC(rip6s_fullsock);
320 sorwakeup(last->inp_socket);
323 RIP6STAT_INC(rip6s_nosock);
324 if (m->m_flags & M_MCAST)
325 RIP6STAT_INC(rip6s_nosockmcast);
326 if (proto == IPPROTO_NONE)
329 icmp6_error(m, ICMP6_PARAM_PROB,
330 ICMP6_PARAMPROB_NEXTHEADER,
331 ip6_get_prevhdr(m, *offp));
332 IP6STAT_DEC(ip6s_delivered);
334 return (IPPROTO_DONE);
338 rip6_ctlinput(int cmd, struct sockaddr *sa, void *d)
340 struct ip6ctlparam *ip6cp = NULL;
341 const struct sockaddr_in6 *sa6_src = NULL;
343 struct inpcb *(*notify)(struct inpcb *, int) = in6_rtchange;
345 if (sa->sa_family != AF_INET6 ||
346 sa->sa_len != sizeof(struct sockaddr_in6))
349 if ((unsigned)cmd >= PRC_NCMDS)
351 if (PRC_IS_REDIRECT(cmd))
352 notify = in6_rtchange, d = NULL;
353 else if (cmd == PRC_HOSTDEAD)
355 else if (inet6ctlerrmap[cmd] == 0)
359 * If the parameter is from icmp6, decode it.
362 ip6cp = (struct ip6ctlparam *)d;
363 cmdarg = ip6cp->ip6c_cmdarg;
364 sa6_src = ip6cp->ip6c_src;
370 (void) in6_pcbnotify(&V_ripcbinfo, sa, 0,
371 (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify);
375 * Generate IPv6 header and pass packet to ip6_output. Tack on options user
376 * may have setup with control call.
379 rip6_output(struct mbuf *m, struct socket *so, ...)
381 struct mbuf *control;
383 struct sockaddr_in6 *dstsock;
386 u_int plen = m->m_pkthdr.len;
388 struct ip6_pktopts opt, *optp;
389 struct ifnet *oifp = NULL;
390 int type = 0, code = 0; /* for ICMPv6 output statistics only */
391 int scope_ambiguous = 0;
394 struct in6_addr in6a;
398 dstsock = va_arg(ap, struct sockaddr_in6 *);
399 control = va_arg(ap, struct mbuf *);
402 in6p = sotoinpcb(so);
405 if (control != NULL) {
406 if ((error = ip6_setpktopts(control, &opt,
407 in6p->in6p_outputopts, so->so_cred,
408 so->so_proto->pr_protocol)) != 0) {
413 optp = in6p->in6p_outputopts;
416 * Check and convert scope zone ID into internal form.
418 * XXX: we may still need to determine the zone later.
420 if (!(so->so_state & SS_ISCONNECTED)) {
421 if (!optp || !optp->ip6po_pktinfo ||
422 !optp->ip6po_pktinfo->ipi6_ifindex)
423 use_defzone = V_ip6_use_defzone;
424 if (dstsock->sin6_scope_id == 0 && !use_defzone)
426 if ((error = sa6_embedscope(dstsock, use_defzone)) != 0)
431 * For an ICMPv6 packet, we should know its type and code to update
434 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) {
435 struct icmp6_hdr *icmp6;
436 if (m->m_len < sizeof(struct icmp6_hdr) &&
437 (m = m_pullup(m, sizeof(struct icmp6_hdr))) == NULL) {
441 icmp6 = mtod(m, struct icmp6_hdr *);
442 type = icmp6->icmp6_type;
443 code = icmp6->icmp6_code;
446 M_PREPEND(m, sizeof(*ip6), M_NOWAIT);
451 ip6 = mtod(m, struct ip6_hdr *);
454 * Source address selection.
456 error = in6_selectsrc_socket(dstsock, optp, in6p, so->so_cred,
457 scope_ambiguous, &in6a, &hlim);
461 error = prison_check_ip6(in6p->inp_cred, &in6a);
466 ip6->ip6_dst = dstsock->sin6_addr;
469 * Fill in the rest of the IPv6 header fields.
471 ip6->ip6_flow = (ip6->ip6_flow & ~IPV6_FLOWINFO_MASK) |
472 (in6p->inp_flow & IPV6_FLOWINFO_MASK);
473 ip6->ip6_vfc = (ip6->ip6_vfc & ~IPV6_VERSION_MASK) |
474 (IPV6_VERSION & IPV6_VERSION_MASK);
477 * ip6_plen will be filled in ip6_output, so not fill it here.
479 ip6->ip6_nxt = in6p->inp_ip_p;
480 ip6->ip6_hlim = hlim;
482 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6 ||
483 in6p->in6p_cksum != -1) {
488 /* Compute checksum. */
489 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6)
490 off = offsetof(struct icmp6_hdr, icmp6_cksum);
492 off = in6p->in6p_cksum;
493 if (plen < off + 1) {
497 off += sizeof(struct ip6_hdr);
500 while (n && n->m_len <= off) {
506 p = (u_int16_t *)(mtod(n, caddr_t) + off);
508 *p = in6_cksum(m, ip6->ip6_nxt, sizeof(*ip6), plen);
512 * Send RA/RS messages to user land for protection, before sending
513 * them to rtadvd/rtsol.
515 if ((send_sendso_input_hook != NULL) &&
516 so->so_proto->pr_protocol == IPPROTO_ICMPV6) {
518 case ND_ROUTER_ADVERT:
519 case ND_ROUTER_SOLICIT:
520 mtag = m_tag_get(PACKET_TAG_ND_OUTGOING,
521 sizeof(unsigned short), M_NOWAIT);
524 m_tag_prepend(m, mtag);
528 error = ip6_output(m, optp, NULL, 0, in6p->in6p_moptions, &oifp, in6p);
529 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) {
531 icmp6_ifoutstat_inc(oifp, type, code);
532 ICMP6STAT_INC(icp6s_outhist[type]);
534 RIP6STAT_INC(rip6s_opackets);
543 if (control != NULL) {
544 ip6_clearpktopts(&opt, -1);
552 * Raw IPv6 socket option processing.
555 rip6_ctloutput(struct socket *so, struct sockopt *sopt)
560 if (sopt->sopt_level == IPPROTO_ICMPV6)
562 * XXX: is it better to call icmp6_ctloutput() directly
565 return (icmp6_ctloutput(so, sopt));
566 else if (sopt->sopt_level != IPPROTO_IPV6) {
567 if (sopt->sopt_level == SOL_SOCKET &&
568 sopt->sopt_name == SO_SETFIB) {
571 inp->inp_inc.inc_fibnum = so->so_fibnum;
580 switch (sopt->sopt_dir) {
582 switch (sopt->sopt_name) {
590 error = ip6_mrouter_get ? ip6_mrouter_get(so, sopt) :
594 error = ip6_raw_ctloutput(so, sopt);
597 error = ip6_ctloutput(so, sopt);
603 switch (sopt->sopt_name) {
611 error = ip6_mrouter_set ? ip6_mrouter_set(so, sopt) :
615 error = ip6_raw_ctloutput(so, sopt);
618 error = ip6_ctloutput(so, sopt);
628 rip6_attach(struct socket *so, int proto, struct thread *td)
631 struct icmp6_filter *filter;
635 KASSERT(inp == NULL, ("rip6_attach: inp != NULL"));
637 error = priv_check(td, PRIV_NETINET_RAW);
640 error = soreserve(so, rip_sendspace, rip_recvspace);
643 filter = malloc(sizeof(struct icmp6_filter), M_PCB, M_NOWAIT);
646 INP_INFO_WLOCK(&V_ripcbinfo);
647 error = in_pcballoc(so, &V_ripcbinfo);
649 INP_INFO_WUNLOCK(&V_ripcbinfo);
653 inp = (struct inpcb *)so->so_pcb;
654 INP_INFO_WUNLOCK(&V_ripcbinfo);
655 inp->inp_vflag |= INP_IPV6;
656 inp->inp_ip_p = (long)proto;
657 inp->in6p_hops = -1; /* use kernel default */
658 inp->in6p_cksum = -1;
659 inp->in6p_icmp6filt = filter;
660 ICMP6_FILTER_SETPASSALL(inp->in6p_icmp6filt);
666 rip6_detach(struct socket *so)
671 KASSERT(inp != NULL, ("rip6_detach: inp == NULL"));
673 if (so == V_ip6_mrouter && ip6_mrouter_done)
676 INP_INFO_WLOCK(&V_ripcbinfo);
678 free(inp->in6p_icmp6filt, M_PCB);
681 INP_INFO_WUNLOCK(&V_ripcbinfo);
684 /* XXXRW: This can't ever be called. */
686 rip6_abort(struct socket *so)
691 KASSERT(inp != NULL, ("rip6_abort: inp == NULL"));
693 soisdisconnected(so);
697 rip6_close(struct socket *so)
702 KASSERT(inp != NULL, ("rip6_close: inp == NULL"));
704 soisdisconnected(so);
708 rip6_disconnect(struct socket *so)
713 KASSERT(inp != NULL, ("rip6_disconnect: inp == NULL"));
715 if ((so->so_state & SS_ISCONNECTED) == 0)
717 inp->in6p_faddr = in6addr_any;
723 rip6_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
726 struct sockaddr_in6 *addr = (struct sockaddr_in6 *)nam;
727 struct ifaddr *ifa = NULL;
731 KASSERT(inp != NULL, ("rip6_bind: inp == NULL"));
733 if (nam->sa_len != sizeof(*addr))
735 if ((error = prison_check_ip6(td->td_ucred, &addr->sin6_addr)) != 0)
737 if (TAILQ_EMPTY(&V_ifnet) || addr->sin6_family != AF_INET6)
738 return (EADDRNOTAVAIL);
739 if ((error = sa6_embedscope(addr, V_ip6_use_defzone)) != 0)
742 if (!IN6_IS_ADDR_UNSPECIFIED(&addr->sin6_addr) &&
743 (ifa = ifa_ifwithaddr((struct sockaddr *)addr)) == NULL)
744 return (EADDRNOTAVAIL);
746 ((struct in6_ifaddr *)ifa)->ia6_flags &
747 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|
748 IN6_IFF_DETACHED|IN6_IFF_DEPRECATED)) {
750 return (EADDRNOTAVAIL);
754 INP_INFO_WLOCK(&V_ripcbinfo);
756 inp->in6p_laddr = addr->sin6_addr;
758 INP_INFO_WUNLOCK(&V_ripcbinfo);
763 rip6_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
766 struct sockaddr_in6 *addr = (struct sockaddr_in6 *)nam;
767 struct in6_addr in6a;
768 int error = 0, scope_ambiguous = 0;
771 KASSERT(inp != NULL, ("rip6_connect: inp == NULL"));
773 if (nam->sa_len != sizeof(*addr))
775 if (TAILQ_EMPTY(&V_ifnet))
776 return (EADDRNOTAVAIL);
777 if (addr->sin6_family != AF_INET6)
778 return (EAFNOSUPPORT);
781 * Application should provide a proper zone ID or the use of default
782 * zone IDs should be enabled. Unfortunately, some applications do
783 * not behave as it should, so we need a workaround. Even if an
784 * appropriate ID is not determined, we'll see if we can determine
785 * the outgoing interface. If we can, determine the zone ID based on
786 * the interface below.
788 if (addr->sin6_scope_id == 0 && !V_ip6_use_defzone)
790 if ((error = sa6_embedscope(addr, V_ip6_use_defzone)) != 0)
793 INP_INFO_WLOCK(&V_ripcbinfo);
795 /* Source address selection. XXX: need pcblookup? */
796 error = in6_selectsrc_socket(addr, inp->in6p_outputopts,
797 inp, so->so_cred, scope_ambiguous, &in6a, NULL);
800 INP_INFO_WUNLOCK(&V_ripcbinfo);
804 inp->in6p_faddr = addr->sin6_addr;
805 inp->in6p_laddr = in6a;
808 INP_INFO_WUNLOCK(&V_ripcbinfo);
813 rip6_shutdown(struct socket *so)
818 KASSERT(inp != NULL, ("rip6_shutdown: inp == NULL"));
827 rip6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
828 struct mbuf *control, struct thread *td)
831 struct sockaddr_in6 tmp;
832 struct sockaddr_in6 *dst;
836 KASSERT(inp != NULL, ("rip6_send: inp == NULL"));
838 /* Always copy sockaddr to avoid overwrites. */
840 if (so->so_state & SS_ISCONNECTED) {
846 bzero(&tmp, sizeof(tmp));
847 tmp.sin6_family = AF_INET6;
848 tmp.sin6_len = sizeof(struct sockaddr_in6);
850 bcopy(&inp->in6p_faddr, &tmp.sin6_addr,
851 sizeof(struct in6_addr));
859 if (nam->sa_len != sizeof(struct sockaddr_in6)) {
863 tmp = *(struct sockaddr_in6 *)nam;
866 if (dst->sin6_family == AF_UNSPEC) {
868 * XXX: we allow this case for backward
869 * compatibility to buggy applications that
870 * rely on old (and wrong) kernel behavior.
872 log(LOG_INFO, "rip6 SEND: address family is "
873 "unspec. Assume AF_INET6\n");
874 dst->sin6_family = AF_INET6;
875 } else if (dst->sin6_family != AF_INET6) {
877 return(EAFNOSUPPORT);
880 ret = rip6_output(m, so, dst, control);
884 struct pr_usrreqs rip6_usrreqs = {
885 .pru_abort = rip6_abort,
886 .pru_attach = rip6_attach,
887 .pru_bind = rip6_bind,
888 .pru_connect = rip6_connect,
889 .pru_control = in6_control,
890 .pru_detach = rip6_detach,
891 .pru_disconnect = rip6_disconnect,
892 .pru_peeraddr = in6_getpeeraddr,
893 .pru_send = rip6_send,
894 .pru_shutdown = rip6_shutdown,
895 .pru_sockaddr = in6_getsockaddr,
896 .pru_close = rip6_close,