2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
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16 * may be used to endorse or promote products derived from this software
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33 * Copyright (c) 1982, 1986, 1988, 1993
34 * The Regents of the University of California.
35 * All rights reserved.
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38 * modification, are permitted provided that the following conditions
40 * 1. Redistributions of source code must retain the above copyright
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43 * notice, this list of conditions and the following disclaimer in the
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46 * may be used to endorse or promote products derived from this software
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50 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
51 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
52 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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54 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
55 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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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"
69 #include "opt_route.h"
71 #include <sys/param.h>
72 #include <sys/errno.h>
74 #include <sys/kernel.h>
76 #include <sys/malloc.h>
80 #include <sys/protosw.h>
81 #include <sys/signalvar.h>
82 #include <sys/socket.h>
83 #include <sys/socketvar.h>
85 #include <sys/syslog.h>
88 #include <net/if_var.h>
89 #include <net/if_types.h>
90 #include <net/route.h>
93 #include <netinet/in.h>
94 #include <netinet/in_var.h>
95 #include <netinet/in_systm.h>
96 #include <netinet/in_pcb.h>
98 #include <netinet/icmp6.h>
99 #include <netinet/ip6.h>
100 #include <netinet/ip_var.h>
101 #include <netinet6/ip6protosw.h>
102 #include <netinet6/ip6_mroute.h>
103 #include <netinet6/in6_pcb.h>
104 #include <netinet6/ip6_var.h>
105 #include <netinet6/nd6.h>
106 #include <netinet6/raw_ip6.h>
107 #include <netinet6/in6_fib.h>
108 #include <netinet6/scope6_var.h>
109 #include <netinet6/send.h>
111 #include <netipsec/ipsec_support.h>
113 #include <machine/stdarg.h>
115 #define satosin6(sa) ((struct sockaddr_in6 *)(sa))
116 #define ifatoia6(ifa) ((struct in6_ifaddr *)(ifa))
119 * Raw interface to IP6 protocol.
122 VNET_DECLARE(struct inpcbinfo, ripcbinfo);
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);
154 struct rip6_inp_match_ctx {
160 rip6_inp_match(const struct inpcb *inp, void *v)
162 struct rip6_inp_match_ctx *c = v;
163 struct ip6_hdr *ip6 = c->ip6;
164 int proto = c->proto;
166 /* XXX inp locking */
167 if ((inp->inp_vflag & INP_IPV6) == 0)
169 if (inp->inp_ip_p && inp->inp_ip_p != proto)
171 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) &&
172 !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &ip6->ip6_dst))
174 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) &&
175 !IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &ip6->ip6_src))
182 * Setup generic address and protocol structures for raw_input routine, then
183 * pass them along with mbuf chain.
186 rip6_input(struct mbuf **mp, int *offp, int proto)
189 struct mbuf *n, *m = *mp;
190 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
192 struct mbuf *opts = NULL;
193 struct sockaddr_in6 fromsa;
194 struct rip6_inp_match_ctx ctx = { .ip6 = ip6, .proto = proto };
195 struct inpcb_iterator inpi = INP_ITERATOR(&V_ripcbinfo,
196 INPLOOKUP_RLOCKPCB, rip6_inp_match, &ctx);
201 RIP6STAT_INC(rip6s_ipackets);
203 init_sin6(&fromsa, m, 0); /* general init */
205 ifp = m->m_pkthdr.rcvif;
207 while ((inp = inp_next(&inpi)) != NULL) {
208 INP_RLOCK_ASSERT(inp);
209 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
211 * Check AH/ESP integrity.
213 if (IPSEC_ENABLED(ipv6) &&
214 IPSEC_CHECK_POLICY(ipv6, m, inp) != 0) {
215 /* Do not inject data into pcb. */
219 if (jailed_without_vnet(inp->inp_cred) &&
220 !IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) &&
221 prison_check_ip6(inp->inp_cred, &ip6->ip6_dst) != 0)
223 * Allow raw socket in jail to receive multicast;
224 * assume process had PRIV_NETINET_RAW at attach,
225 * and fall through into normal filter path if so.
228 if (inp->in6p_cksum != -1) {
229 RIP6STAT_INC(rip6s_isum);
230 if (m->m_pkthdr.len - (*offp + inp->in6p_cksum) < 2 ||
231 in6_cksum(m, proto, *offp,
232 m->m_pkthdr.len - *offp)) {
233 RIP6STAT_INC(rip6s_badsum);
235 * Drop the received message, don't send an
236 * ICMP6 message. Set proto to IPPROTO_NONE
240 proto = IPPROTO_NONE;
245 * If this raw socket has multicast state, and we
246 * have received a multicast, check if this socket
247 * should receive it, as multicast filtering is now
248 * the responsibility of the transport layer.
250 if (inp->in6p_moptions &&
251 IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
253 * If the incoming datagram is for MLD, allow it
254 * through unconditionally to the raw socket.
256 * Use the M_RTALERT_MLD flag to check for MLD
257 * traffic without having to inspect the mbuf chain
258 * more deeply, as all MLDv1/v2 host messages MUST
259 * contain the Router Alert option.
261 * In the case of MLDv1, we may not have explicitly
262 * joined the group, and may have set IFF_ALLMULTI
263 * on the interface. im6o_mc_filter() may discard
264 * control traffic we actually need to see.
266 * Userland multicast routing daemons should continue
267 * filter the control traffic appropriately.
271 blocked = MCAST_PASS;
272 if ((m->m_flags & M_RTALERT_MLD) == 0) {
273 struct sockaddr_in6 mcaddr;
275 bzero(&mcaddr, sizeof(struct sockaddr_in6));
276 mcaddr.sin6_len = sizeof(struct sockaddr_in6);
277 mcaddr.sin6_family = AF_INET6;
278 mcaddr.sin6_addr = ip6->ip6_dst;
280 blocked = im6o_mc_filter(inp->in6p_moptions,
282 (struct sockaddr *)&mcaddr,
283 (struct sockaddr *)&fromsa);
285 if (blocked != MCAST_PASS) {
286 IP6STAT_INC(ip6s_notmember);
290 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL)
292 if (inp->inp_flags & INP_CONTROLOPTS ||
293 inp->inp_socket->so_options & SO_TIMESTAMP)
294 ip6_savecontrol(inp, n, &opts);
295 /* strip intermediate headers */
297 if (sbappendaddr(&inp->inp_socket->so_rcv,
298 (struct sockaddr *)&fromsa, n, opts) == 0) {
299 soroverflow(inp->inp_socket);
303 RIP6STAT_INC(rip6s_fullsock);
305 sorwakeup(inp->inp_socket);
310 if (delivered == 0) {
311 RIP6STAT_INC(rip6s_nosock);
312 if (m->m_flags & M_MCAST)
313 RIP6STAT_INC(rip6s_nosockmcast);
314 if (proto == IPPROTO_NONE)
317 icmp6_error(m, ICMP6_PARAM_PROB,
318 ICMP6_PARAMPROB_NEXTHEADER,
319 ip6_get_prevhdr(m, *offp));
320 IP6STAT_DEC(ip6s_delivered);
323 return (IPPROTO_DONE);
327 rip6_ctlinput(int cmd, struct sockaddr *sa, void *d)
329 struct ip6ctlparam *ip6cp = NULL;
330 const struct sockaddr_in6 *sa6_src = NULL;
332 struct inpcb *(*notify)(struct inpcb *, int) = in6_rtchange;
334 if (sa->sa_family != AF_INET6 ||
335 sa->sa_len != sizeof(struct sockaddr_in6))
338 if ((unsigned)cmd >= PRC_NCMDS)
340 if (PRC_IS_REDIRECT(cmd))
341 notify = in6_rtchange, d = NULL;
342 else if (cmd == PRC_HOSTDEAD)
344 else if (inet6ctlerrmap[cmd] == 0)
348 * If the parameter is from icmp6, decode it.
351 ip6cp = (struct ip6ctlparam *)d;
352 cmdarg = ip6cp->ip6c_cmdarg;
353 sa6_src = ip6cp->ip6c_src;
359 (void) in6_pcbnotify(&V_ripcbinfo, sa, 0,
360 (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify);
364 * Generate IPv6 header and pass packet to ip6_output. Tack on options user
365 * may have setup with control call.
368 rip6_output(struct mbuf *m, struct socket *so, ...)
370 struct epoch_tracker et;
371 struct mbuf *control;
373 struct sockaddr_in6 *dstsock;
376 u_int plen = m->m_pkthdr.len;
378 struct ip6_pktopts opt, *optp;
379 struct ifnet *oifp = NULL;
380 int type = 0, code = 0; /* for ICMPv6 output statistics only */
381 int scope_ambiguous = 0;
384 struct in6_addr in6a;
388 dstsock = va_arg(ap, struct sockaddr_in6 *);
389 control = va_arg(ap, struct mbuf *);
395 if (control != NULL) {
397 error = ip6_setpktopts(control, &opt,
398 inp->in6p_outputopts, so->so_cred,
399 so->so_proto->pr_protocol);
407 optp = inp->in6p_outputopts;
410 * Check and convert scope zone ID into internal form.
412 * XXX: we may still need to determine the zone later.
414 if (!(so->so_state & SS_ISCONNECTED)) {
415 if (!optp || !optp->ip6po_pktinfo ||
416 !optp->ip6po_pktinfo->ipi6_ifindex)
417 use_defzone = V_ip6_use_defzone;
418 if (dstsock->sin6_scope_id == 0 && !use_defzone)
420 if ((error = sa6_embedscope(dstsock, use_defzone)) != 0)
425 * For an ICMPv6 packet, we should know its type and code to update
428 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) {
429 struct icmp6_hdr *icmp6;
430 if (m->m_len < sizeof(struct icmp6_hdr) &&
431 (m = m_pullup(m, sizeof(struct icmp6_hdr))) == NULL) {
435 icmp6 = mtod(m, struct icmp6_hdr *);
436 type = icmp6->icmp6_type;
437 code = icmp6->icmp6_code;
440 M_PREPEND(m, sizeof(*ip6), M_NOWAIT);
445 ip6 = mtod(m, struct ip6_hdr *);
448 if (CALC_FLOWID_OUTBOUND) {
449 uint32_t hash_type, hash_val;
451 hash_val = fib6_calc_software_hash(&inp->in6p_laddr,
452 &dstsock->sin6_addr, 0, 0, so->so_proto->pr_protocol,
454 inp->inp_flowid = hash_val;
455 inp->inp_flowtype = hash_type;
459 * Source address selection.
462 error = in6_selectsrc_socket(dstsock, optp, inp, so->so_cred,
463 scope_ambiguous, &in6a, &hlim);
468 error = prison_check_ip6(inp->inp_cred, &in6a);
473 ip6->ip6_dst = dstsock->sin6_addr;
476 * Fill in the rest of the IPv6 header fields.
478 ip6->ip6_flow = (ip6->ip6_flow & ~IPV6_FLOWINFO_MASK) |
479 (inp->inp_flow & IPV6_FLOWINFO_MASK);
480 ip6->ip6_vfc = (ip6->ip6_vfc & ~IPV6_VERSION_MASK) |
481 (IPV6_VERSION & IPV6_VERSION_MASK);
484 * ip6_plen will be filled in ip6_output, so not fill it here.
486 ip6->ip6_nxt = inp->inp_ip_p;
487 ip6->ip6_hlim = hlim;
489 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6 ||
490 inp->in6p_cksum != -1) {
495 /* Compute checksum. */
496 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6)
497 off = offsetof(struct icmp6_hdr, icmp6_cksum);
499 off = inp->in6p_cksum;
500 if (plen < off + 2) {
504 off += sizeof(struct ip6_hdr);
507 while (n && n->m_len <= off) {
513 p = (u_int16_t *)(mtod(n, caddr_t) + off);
515 *p = in6_cksum(m, ip6->ip6_nxt, sizeof(*ip6), plen);
519 * Send RA/RS messages to user land for protection, before sending
520 * them to rtadvd/rtsol.
522 if ((send_sendso_input_hook != NULL) &&
523 so->so_proto->pr_protocol == IPPROTO_ICMPV6) {
525 case ND_ROUTER_ADVERT:
526 case ND_ROUTER_SOLICIT:
527 mtag = m_tag_get(PACKET_TAG_ND_OUTGOING,
528 sizeof(unsigned short), M_NOWAIT);
531 m_tag_prepend(m, mtag);
536 error = ip6_output(m, optp, NULL, 0, inp->in6p_moptions, &oifp, inp);
538 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) {
540 icmp6_ifoutstat_inc(oifp, type, code);
541 ICMP6STAT_INC(icp6s_outhist[type]);
543 RIP6STAT_INC(rip6s_opackets);
552 if (control != NULL) {
553 ip6_clearpktopts(&opt, -1);
561 * Raw IPv6 socket option processing.
564 rip6_ctloutput(struct socket *so, struct sockopt *sopt)
569 if (sopt->sopt_level == IPPROTO_ICMPV6)
571 * XXX: is it better to call icmp6_ctloutput() directly
574 return (icmp6_ctloutput(so, sopt));
575 else if (sopt->sopt_level != IPPROTO_IPV6) {
576 if (sopt->sopt_level == SOL_SOCKET &&
577 sopt->sopt_name == SO_SETFIB) {
580 inp->inp_inc.inc_fibnum = so->so_fibnum;
589 switch (sopt->sopt_dir) {
591 switch (sopt->sopt_name) {
599 error = ip6_mrouter_get ? ip6_mrouter_get(so, sopt) :
603 error = ip6_raw_ctloutput(so, sopt);
606 error = ip6_ctloutput(so, sopt);
612 switch (sopt->sopt_name) {
620 error = ip6_mrouter_set ? ip6_mrouter_set(so, sopt) :
624 error = ip6_raw_ctloutput(so, sopt);
627 error = ip6_ctloutput(so, sopt);
637 rip6_attach(struct socket *so, int proto, struct thread *td)
640 struct icmp6_filter *filter;
644 KASSERT(inp == NULL, ("rip6_attach: inp != NULL"));
646 error = priv_check(td, PRIV_NETINET_RAW);
649 error = soreserve(so, rip_sendspace, rip_recvspace);
652 filter = malloc(sizeof(struct icmp6_filter), M_PCB, M_NOWAIT);
655 error = in_pcballoc(so, &V_ripcbinfo);
660 inp = (struct inpcb *)so->so_pcb;
661 inp->inp_vflag |= INP_IPV6;
662 inp->inp_ip_p = (long)proto;
663 inp->in6p_hops = -1; /* use kernel default */
664 inp->in6p_cksum = -1;
665 inp->in6p_icmp6filt = filter;
666 ICMP6_FILTER_SETPASSALL(inp->in6p_icmp6filt);
672 rip6_detach(struct socket *so)
677 KASSERT(inp != NULL, ("rip6_detach: inp == NULL"));
679 if (so == V_ip6_mrouter && ip6_mrouter_done)
683 free(inp->in6p_icmp6filt, M_PCB);
688 /* XXXRW: This can't ever be called. */
690 rip6_abort(struct socket *so)
695 KASSERT(inp != NULL, ("rip6_abort: inp == NULL"));
697 soisdisconnected(so);
701 rip6_close(struct socket *so)
706 KASSERT(inp != NULL, ("rip6_close: inp == NULL"));
708 soisdisconnected(so);
712 rip6_disconnect(struct socket *so)
717 KASSERT(inp != NULL, ("rip6_disconnect: inp == NULL"));
719 if ((so->so_state & SS_ISCONNECTED) == 0)
721 inp->in6p_faddr = in6addr_any;
727 rip6_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
729 struct epoch_tracker et;
731 struct sockaddr_in6 *addr = (struct sockaddr_in6 *)nam;
732 struct ifaddr *ifa = NULL;
736 KASSERT(inp != NULL, ("rip6_bind: inp == NULL"));
738 if (nam->sa_family != AF_INET6)
739 return (EAFNOSUPPORT);
740 if (nam->sa_len != sizeof(*addr))
742 if ((error = prison_check_ip6(td->td_ucred, &addr->sin6_addr)) != 0)
744 if (CK_STAILQ_EMPTY(&V_ifnet) || addr->sin6_family != AF_INET6)
745 return (EADDRNOTAVAIL);
746 if ((error = sa6_embedscope(addr, V_ip6_use_defzone)) != 0)
750 if (!IN6_IS_ADDR_UNSPECIFIED(&addr->sin6_addr) &&
751 (ifa = ifa_ifwithaddr((struct sockaddr *)addr)) == NULL) {
753 return (EADDRNOTAVAIL);
756 ((struct in6_ifaddr *)ifa)->ia6_flags &
757 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|
758 IN6_IFF_DETACHED|IN6_IFF_DEPRECATED)) {
760 return (EADDRNOTAVAIL);
763 INP_INFO_WLOCK(&V_ripcbinfo);
765 inp->in6p_laddr = addr->sin6_addr;
767 INP_INFO_WUNLOCK(&V_ripcbinfo);
772 rip6_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
775 struct sockaddr_in6 *addr = (struct sockaddr_in6 *)nam;
776 struct in6_addr in6a;
777 struct epoch_tracker et;
778 int error = 0, scope_ambiguous = 0;
781 KASSERT(inp != NULL, ("rip6_connect: inp == NULL"));
783 if (nam->sa_len != sizeof(*addr))
785 if (CK_STAILQ_EMPTY(&V_ifnet))
786 return (EADDRNOTAVAIL);
787 if (addr->sin6_family != AF_INET6)
788 return (EAFNOSUPPORT);
791 * Application should provide a proper zone ID or the use of default
792 * zone IDs should be enabled. Unfortunately, some applications do
793 * not behave as it should, so we need a workaround. Even if an
794 * appropriate ID is not determined, we'll see if we can determine
795 * the outgoing interface. If we can, determine the zone ID based on
796 * the interface below.
798 if (addr->sin6_scope_id == 0 && !V_ip6_use_defzone)
800 if ((error = sa6_embedscope(addr, V_ip6_use_defzone)) != 0)
804 INP_INFO_WLOCK(&V_ripcbinfo);
805 /* Source address selection. XXX: need pcblookup? */
807 error = in6_selectsrc_socket(addr, inp->in6p_outputopts,
808 inp, so->so_cred, scope_ambiguous, &in6a, NULL);
811 INP_INFO_WUNLOCK(&V_ripcbinfo);
816 inp->in6p_faddr = addr->sin6_addr;
817 inp->in6p_laddr = in6a;
819 INP_INFO_WUNLOCK(&V_ripcbinfo);
825 rip6_shutdown(struct socket *so)
830 KASSERT(inp != NULL, ("rip6_shutdown: inp == NULL"));
839 rip6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
840 struct mbuf *control, struct thread *td)
843 struct sockaddr_in6 tmp;
844 struct sockaddr_in6 *dst;
848 KASSERT(inp != NULL, ("rip6_send: inp == NULL"));
850 /* Always copy sockaddr to avoid overwrites. */
852 if (so->so_state & SS_ISCONNECTED) {
858 bzero(&tmp, sizeof(tmp));
859 tmp.sin6_family = AF_INET6;
860 tmp.sin6_len = sizeof(struct sockaddr_in6);
862 bcopy(&inp->in6p_faddr, &tmp.sin6_addr,
863 sizeof(struct in6_addr));
870 else if (nam->sa_family != AF_INET6)
871 error = EAFNOSUPPORT;
872 else if (nam->sa_len != sizeof(struct sockaddr_in6))
876 tmp = *(struct sockaddr_in6 *)nam;
879 if (dst->sin6_family == AF_UNSPEC) {
881 * XXX: we allow this case for backward
882 * compatibility to buggy applications that
883 * rely on old (and wrong) kernel behavior.
885 log(LOG_INFO, "rip6 SEND: address family is "
886 "unspec. Assume AF_INET6\n");
887 dst->sin6_family = AF_INET6;
888 } else if (dst->sin6_family != AF_INET6) {
889 error = EAFNOSUPPORT;
893 return (rip6_output(m, so, dst, control));
902 struct pr_usrreqs rip6_usrreqs = {
903 .pru_abort = rip6_abort,
904 .pru_attach = rip6_attach,
905 .pru_bind = rip6_bind,
906 .pru_connect = rip6_connect,
907 .pru_control = in6_control,
908 .pru_detach = rip6_detach,
909 .pru_disconnect = rip6_disconnect,
910 .pru_peeraddr = in6_getpeeraddr,
911 .pru_send = rip6_send,
912 .pru_shutdown = rip6_shutdown,
913 .pru_sockaddr = in6_getsockaddr,
914 .pru_close = rip6_close,