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4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
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51 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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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;
168 struct epoch_tracker et;
170 RIP6STAT_INC(rip6s_ipackets);
172 init_sin6(&fromsa, m, 0); /* general init */
174 ifp = m->m_pkthdr.rcvif;
176 INP_INFO_RLOCK_ET(&V_ripcbinfo, et);
177 CK_LIST_FOREACH(in6p, &V_ripcb, inp_list) {
178 /* XXX inp locking */
179 if ((in6p->inp_vflag & INP_IPV6) == 0)
181 if (in6p->inp_ip_p &&
182 in6p->inp_ip_p != proto)
184 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) &&
185 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst))
187 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) &&
188 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src))
190 if (jailed_without_vnet(in6p->inp_cred)) {
192 * Allow raw socket in jail to receive multicast;
193 * assume process had PRIV_NETINET_RAW at attach,
194 * and fall through into normal filter path if so.
196 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) &&
197 prison_check_ip6(in6p->inp_cred,
202 if (in6p->in6p_cksum != -1) {
203 RIP6STAT_INC(rip6s_isum);
204 if (in6_cksum(m, proto, *offp,
205 m->m_pkthdr.len - *offp)) {
207 RIP6STAT_INC(rip6s_badsum);
212 * If this raw socket has multicast state, and we
213 * have received a multicast, check if this socket
214 * should receive it, as multicast filtering is now
215 * the responsibility of the transport layer.
217 if (in6p->in6p_moptions &&
218 IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
220 * If the incoming datagram is for MLD, allow it
221 * through unconditionally to the raw socket.
223 * Use the M_RTALERT_MLD flag to check for MLD
224 * traffic without having to inspect the mbuf chain
225 * more deeply, as all MLDv1/v2 host messages MUST
226 * contain the Router Alert option.
228 * In the case of MLDv1, we may not have explicitly
229 * joined the group, and may have set IFF_ALLMULTI
230 * on the interface. im6o_mc_filter() may discard
231 * control traffic we actually need to see.
233 * Userland multicast routing daemons should continue
234 * filter the control traffic appropriately.
238 blocked = MCAST_PASS;
239 if ((m->m_flags & M_RTALERT_MLD) == 0) {
240 struct sockaddr_in6 mcaddr;
242 bzero(&mcaddr, sizeof(struct sockaddr_in6));
243 mcaddr.sin6_len = sizeof(struct sockaddr_in6);
244 mcaddr.sin6_family = AF_INET6;
245 mcaddr.sin6_addr = ip6->ip6_dst;
247 blocked = im6o_mc_filter(in6p->in6p_moptions,
249 (struct sockaddr *)&mcaddr,
250 (struct sockaddr *)&fromsa);
252 if (blocked != MCAST_PASS) {
253 IP6STAT_INC(ip6s_notmember);
259 struct mbuf *n = m_copym(m, 0, M_COPYALL, M_NOWAIT);
261 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
263 * Check AH/ESP integrity.
265 if (IPSEC_ENABLED(ipv6)) {
267 IPSEC_CHECK_POLICY(ipv6, n, last) != 0) {
269 /* Do not inject data into pcb. */
275 if (last->inp_flags & INP_CONTROLOPTS ||
276 last->inp_socket->so_options & SO_TIMESTAMP)
277 ip6_savecontrol(last, n, &opts);
278 /* strip intermediate headers */
280 if (sbappendaddr(&last->inp_socket->so_rcv,
281 (struct sockaddr *)&fromsa,
286 RIP6STAT_INC(rip6s_fullsock);
288 sorwakeup(last->inp_socket);
295 INP_INFO_RUNLOCK_ET(&V_ripcbinfo, et);
296 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
298 * Check AH/ESP integrity.
300 if (IPSEC_ENABLED(ipv6) && last != NULL &&
301 IPSEC_CHECK_POLICY(ipv6, m, last) != 0) {
303 IP6STAT_DEC(ip6s_delivered);
304 /* Do not inject data into pcb. */
309 if (last->inp_flags & INP_CONTROLOPTS ||
310 last->inp_socket->so_options & SO_TIMESTAMP)
311 ip6_savecontrol(last, m, &opts);
312 /* Strip intermediate headers. */
314 if (sbappendaddr(&last->inp_socket->so_rcv,
315 (struct sockaddr *)&fromsa, m, opts) == 0) {
319 RIP6STAT_INC(rip6s_fullsock);
321 sorwakeup(last->inp_socket);
324 RIP6STAT_INC(rip6s_nosock);
325 if (m->m_flags & M_MCAST)
326 RIP6STAT_INC(rip6s_nosockmcast);
327 if (proto == IPPROTO_NONE)
330 icmp6_error(m, ICMP6_PARAM_PROB,
331 ICMP6_PARAMPROB_NEXTHEADER,
332 ip6_get_prevhdr(m, *offp));
333 IP6STAT_DEC(ip6s_delivered);
335 return (IPPROTO_DONE);
339 rip6_ctlinput(int cmd, struct sockaddr *sa, void *d)
341 struct ip6ctlparam *ip6cp = NULL;
342 const struct sockaddr_in6 *sa6_src = NULL;
344 struct inpcb *(*notify)(struct inpcb *, int) = in6_rtchange;
346 if (sa->sa_family != AF_INET6 ||
347 sa->sa_len != sizeof(struct sockaddr_in6))
350 if ((unsigned)cmd >= PRC_NCMDS)
352 if (PRC_IS_REDIRECT(cmd))
353 notify = in6_rtchange, d = NULL;
354 else if (cmd == PRC_HOSTDEAD)
356 else if (inet6ctlerrmap[cmd] == 0)
360 * If the parameter is from icmp6, decode it.
363 ip6cp = (struct ip6ctlparam *)d;
364 cmdarg = ip6cp->ip6c_cmdarg;
365 sa6_src = ip6cp->ip6c_src;
371 (void) in6_pcbnotify(&V_ripcbinfo, sa, 0,
372 (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify);
376 * Generate IPv6 header and pass packet to ip6_output. Tack on options user
377 * may have setup with control call.
380 rip6_output(struct mbuf *m, struct socket *so, ...)
382 struct mbuf *control;
384 struct sockaddr_in6 *dstsock;
387 u_int plen = m->m_pkthdr.len;
389 struct ip6_pktopts opt, *optp;
390 struct ifnet *oifp = NULL;
391 int type = 0, code = 0; /* for ICMPv6 output statistics only */
392 int scope_ambiguous = 0;
395 struct in6_addr in6a;
399 dstsock = va_arg(ap, struct sockaddr_in6 *);
400 control = va_arg(ap, struct mbuf *);
403 in6p = sotoinpcb(so);
406 if (control != NULL) {
407 if ((error = ip6_setpktopts(control, &opt,
408 in6p->in6p_outputopts, so->so_cred,
409 so->so_proto->pr_protocol)) != 0) {
414 optp = in6p->in6p_outputopts;
417 * Check and convert scope zone ID into internal form.
419 * XXX: we may still need to determine the zone later.
421 if (!(so->so_state & SS_ISCONNECTED)) {
422 if (!optp || !optp->ip6po_pktinfo ||
423 !optp->ip6po_pktinfo->ipi6_ifindex)
424 use_defzone = V_ip6_use_defzone;
425 if (dstsock->sin6_scope_id == 0 && !use_defzone)
427 if ((error = sa6_embedscope(dstsock, use_defzone)) != 0)
432 * For an ICMPv6 packet, we should know its type and code to update
435 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) {
436 struct icmp6_hdr *icmp6;
437 if (m->m_len < sizeof(struct icmp6_hdr) &&
438 (m = m_pullup(m, sizeof(struct icmp6_hdr))) == NULL) {
442 icmp6 = mtod(m, struct icmp6_hdr *);
443 type = icmp6->icmp6_type;
444 code = icmp6->icmp6_code;
447 M_PREPEND(m, sizeof(*ip6), M_NOWAIT);
452 ip6 = mtod(m, struct ip6_hdr *);
455 * Source address selection.
457 error = in6_selectsrc_socket(dstsock, optp, in6p, so->so_cred,
458 scope_ambiguous, &in6a, &hlim);
462 error = prison_check_ip6(in6p->inp_cred, &in6a);
467 ip6->ip6_dst = dstsock->sin6_addr;
470 * Fill in the rest of the IPv6 header fields.
472 ip6->ip6_flow = (ip6->ip6_flow & ~IPV6_FLOWINFO_MASK) |
473 (in6p->inp_flow & IPV6_FLOWINFO_MASK);
474 ip6->ip6_vfc = (ip6->ip6_vfc & ~IPV6_VERSION_MASK) |
475 (IPV6_VERSION & IPV6_VERSION_MASK);
478 * ip6_plen will be filled in ip6_output, so not fill it here.
480 ip6->ip6_nxt = in6p->inp_ip_p;
481 ip6->ip6_hlim = hlim;
483 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6 ||
484 in6p->in6p_cksum != -1) {
489 /* Compute checksum. */
490 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6)
491 off = offsetof(struct icmp6_hdr, icmp6_cksum);
493 off = in6p->in6p_cksum;
494 if (plen < off + 1) {
498 off += sizeof(struct ip6_hdr);
501 while (n && n->m_len <= off) {
507 p = (u_int16_t *)(mtod(n, caddr_t) + off);
509 *p = in6_cksum(m, ip6->ip6_nxt, sizeof(*ip6), plen);
513 * Send RA/RS messages to user land for protection, before sending
514 * them to rtadvd/rtsol.
516 if ((send_sendso_input_hook != NULL) &&
517 so->so_proto->pr_protocol == IPPROTO_ICMPV6) {
519 case ND_ROUTER_ADVERT:
520 case ND_ROUTER_SOLICIT:
521 mtag = m_tag_get(PACKET_TAG_ND_OUTGOING,
522 sizeof(unsigned short), M_NOWAIT);
525 m_tag_prepend(m, mtag);
529 error = ip6_output(m, optp, NULL, 0, in6p->in6p_moptions, &oifp, in6p);
530 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) {
532 icmp6_ifoutstat_inc(oifp, type, code);
533 ICMP6STAT_INC(icp6s_outhist[type]);
535 RIP6STAT_INC(rip6s_opackets);
544 if (control != NULL) {
545 ip6_clearpktopts(&opt, -1);
553 * Raw IPv6 socket option processing.
556 rip6_ctloutput(struct socket *so, struct sockopt *sopt)
561 if (sopt->sopt_level == IPPROTO_ICMPV6)
563 * XXX: is it better to call icmp6_ctloutput() directly
566 return (icmp6_ctloutput(so, sopt));
567 else if (sopt->sopt_level != IPPROTO_IPV6) {
568 if (sopt->sopt_level == SOL_SOCKET &&
569 sopt->sopt_name == SO_SETFIB) {
572 inp->inp_inc.inc_fibnum = so->so_fibnum;
581 switch (sopt->sopt_dir) {
583 switch (sopt->sopt_name) {
591 error = ip6_mrouter_get ? ip6_mrouter_get(so, sopt) :
595 error = ip6_raw_ctloutput(so, sopt);
598 error = ip6_ctloutput(so, sopt);
604 switch (sopt->sopt_name) {
612 error = ip6_mrouter_set ? ip6_mrouter_set(so, sopt) :
616 error = ip6_raw_ctloutput(so, sopt);
619 error = ip6_ctloutput(so, sopt);
629 rip6_attach(struct socket *so, int proto, struct thread *td)
632 struct icmp6_filter *filter;
636 KASSERT(inp == NULL, ("rip6_attach: inp != NULL"));
638 error = priv_check(td, PRIV_NETINET_RAW);
641 error = soreserve(so, rip_sendspace, rip_recvspace);
644 filter = malloc(sizeof(struct icmp6_filter), M_PCB, M_NOWAIT);
647 INP_INFO_WLOCK(&V_ripcbinfo);
648 error = in_pcballoc(so, &V_ripcbinfo);
650 INP_INFO_WUNLOCK(&V_ripcbinfo);
654 inp = (struct inpcb *)so->so_pcb;
655 INP_INFO_WUNLOCK(&V_ripcbinfo);
656 inp->inp_vflag |= INP_IPV6;
657 inp->inp_ip_p = (long)proto;
658 inp->in6p_hops = -1; /* use kernel default */
659 inp->in6p_cksum = -1;
660 inp->in6p_icmp6filt = filter;
661 ICMP6_FILTER_SETPASSALL(inp->in6p_icmp6filt);
667 rip6_detach(struct socket *so)
672 KASSERT(inp != NULL, ("rip6_detach: inp == NULL"));
674 if (so == V_ip6_mrouter && ip6_mrouter_done)
677 INP_INFO_WLOCK(&V_ripcbinfo);
679 free(inp->in6p_icmp6filt, M_PCB);
682 INP_INFO_WUNLOCK(&V_ripcbinfo);
685 /* XXXRW: This can't ever be called. */
687 rip6_abort(struct socket *so)
692 KASSERT(inp != NULL, ("rip6_abort: inp == NULL"));
694 soisdisconnected(so);
698 rip6_close(struct socket *so)
703 KASSERT(inp != NULL, ("rip6_close: inp == NULL"));
705 soisdisconnected(so);
709 rip6_disconnect(struct socket *so)
714 KASSERT(inp != NULL, ("rip6_disconnect: inp == NULL"));
716 if ((so->so_state & SS_ISCONNECTED) == 0)
718 inp->in6p_faddr = in6addr_any;
724 rip6_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
727 struct sockaddr_in6 *addr = (struct sockaddr_in6 *)nam;
728 struct ifaddr *ifa = NULL;
732 KASSERT(inp != NULL, ("rip6_bind: inp == NULL"));
734 if (nam->sa_len != sizeof(*addr))
736 if ((error = prison_check_ip6(td->td_ucred, &addr->sin6_addr)) != 0)
738 if (CK_STAILQ_EMPTY(&V_ifnet) || addr->sin6_family != AF_INET6)
739 return (EADDRNOTAVAIL);
740 if ((error = sa6_embedscope(addr, V_ip6_use_defzone)) != 0)
744 if (!IN6_IS_ADDR_UNSPECIFIED(&addr->sin6_addr) &&
745 (ifa = ifa_ifwithaddr((struct sockaddr *)addr)) == NULL) {
747 return (EADDRNOTAVAIL);
750 ((struct in6_ifaddr *)ifa)->ia6_flags &
751 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|
752 IN6_IFF_DETACHED|IN6_IFF_DEPRECATED)) {
754 return (EADDRNOTAVAIL);
757 INP_INFO_WLOCK(&V_ripcbinfo);
759 inp->in6p_laddr = addr->sin6_addr;
761 INP_INFO_WUNLOCK(&V_ripcbinfo);
766 rip6_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
769 struct sockaddr_in6 *addr = (struct sockaddr_in6 *)nam;
770 struct in6_addr in6a;
771 int error = 0, scope_ambiguous = 0;
774 KASSERT(inp != NULL, ("rip6_connect: inp == NULL"));
776 if (nam->sa_len != sizeof(*addr))
778 if (CK_STAILQ_EMPTY(&V_ifnet))
779 return (EADDRNOTAVAIL);
780 if (addr->sin6_family != AF_INET6)
781 return (EAFNOSUPPORT);
784 * Application should provide a proper zone ID or the use of default
785 * zone IDs should be enabled. Unfortunately, some applications do
786 * not behave as it should, so we need a workaround. Even if an
787 * appropriate ID is not determined, we'll see if we can determine
788 * the outgoing interface. If we can, determine the zone ID based on
789 * the interface below.
791 if (addr->sin6_scope_id == 0 && !V_ip6_use_defzone)
793 if ((error = sa6_embedscope(addr, V_ip6_use_defzone)) != 0)
796 INP_INFO_WLOCK(&V_ripcbinfo);
798 /* Source address selection. XXX: need pcblookup? */
799 error = in6_selectsrc_socket(addr, inp->in6p_outputopts,
800 inp, so->so_cred, scope_ambiguous, &in6a, NULL);
803 INP_INFO_WUNLOCK(&V_ripcbinfo);
807 inp->in6p_faddr = addr->sin6_addr;
808 inp->in6p_laddr = in6a;
811 INP_INFO_WUNLOCK(&V_ripcbinfo);
816 rip6_shutdown(struct socket *so)
821 KASSERT(inp != NULL, ("rip6_shutdown: inp == NULL"));
830 rip6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
831 struct mbuf *control, struct thread *td)
834 struct sockaddr_in6 tmp;
835 struct sockaddr_in6 *dst;
839 KASSERT(inp != NULL, ("rip6_send: inp == NULL"));
841 /* Always copy sockaddr to avoid overwrites. */
843 if (so->so_state & SS_ISCONNECTED) {
849 bzero(&tmp, sizeof(tmp));
850 tmp.sin6_family = AF_INET6;
851 tmp.sin6_len = sizeof(struct sockaddr_in6);
853 bcopy(&inp->in6p_faddr, &tmp.sin6_addr,
854 sizeof(struct in6_addr));
862 if (nam->sa_len != sizeof(struct sockaddr_in6)) {
866 tmp = *(struct sockaddr_in6 *)nam;
869 if (dst->sin6_family == AF_UNSPEC) {
871 * XXX: we allow this case for backward
872 * compatibility to buggy applications that
873 * rely on old (and wrong) kernel behavior.
875 log(LOG_INFO, "rip6 SEND: address family is "
876 "unspec. Assume AF_INET6\n");
877 dst->sin6_family = AF_INET6;
878 } else if (dst->sin6_family != AF_INET6) {
880 return(EAFNOSUPPORT);
883 ret = rip6_output(m, so, dst, control);
887 struct pr_usrreqs rip6_usrreqs = {
888 .pru_abort = rip6_abort,
889 .pru_attach = rip6_attach,
890 .pru_bind = rip6_bind,
891 .pru_connect = rip6_connect,
892 .pru_control = in6_control,
893 .pru_detach = rip6_detach,
894 .pru_disconnect = rip6_disconnect,
895 .pru_peeraddr = in6_getpeeraddr,
896 .pru_send = rip6_send,
897 .pru_shutdown = rip6_shutdown,
898 .pru_sockaddr = in6_getsockaddr,
899 .pru_close = rip6_close,