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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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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"
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_private.h>
90 #include <net/if_types.h>
91 #include <net/route.h>
94 #include <netinet/in.h>
95 #include <netinet/in_var.h>
96 #include <netinet/in_systm.h>
97 #include <netinet/in_pcb.h>
99 #include <netinet/icmp6.h>
100 #include <netinet/ip6.h>
101 #include <netinet/ip_var.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(struct ip6ctlparam *ip6cp)
331 if ((errno = icmp6_errmap(ip6cp->ip6c_icmp6)) != 0)
332 in6_pcbnotify(&V_ripcbinfo, ip6cp->ip6c_finaldst, 0,
333 ip6cp->ip6c_src, 0, errno, ip6cp->ip6c_cmdarg,
338 * Generate IPv6 header and pass packet to ip6_output. Tack on options user
339 * may have setup with control call.
342 rip6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
343 struct mbuf *control, struct thread *td)
345 struct epoch_tracker et;
347 struct sockaddr_in6 tmp, *dstsock;
350 u_int plen = m->m_pkthdr.len;
351 struct ip6_pktopts opt, *optp;
352 struct ifnet *oifp = NULL;
354 int type = 0, code = 0; /* for ICMPv6 output statistics only */
355 int scope_ambiguous = 0;
358 struct in6_addr in6a;
361 KASSERT(inp != NULL, ("rip6_send: inp == NULL"));
363 /* Always copy sockaddr to avoid overwrites. */
365 if (so->so_state & SS_ISCONNECTED) {
370 tmp = (struct sockaddr_in6 ){
371 .sin6_family = AF_INET6,
372 .sin6_len = sizeof(struct sockaddr_in6),
375 bcopy(&inp->in6p_faddr, &tmp.sin6_addr,
376 sizeof(struct in6_addr));
382 else if (nam->sa_family != AF_INET6)
383 error = EAFNOSUPPORT;
384 else if (nam->sa_len != sizeof(struct sockaddr_in6))
390 dstsock = (struct sockaddr_in6 *)nam;
391 if (dstsock->sin6_family != AF_INET6) {
392 error = EAFNOSUPPORT;
399 if (control != NULL) {
401 error = ip6_setpktopts(control, &opt, inp->in6p_outputopts,
402 so->so_cred, inp->inp_ip_p);
410 optp = inp->in6p_outputopts;
413 * Check and convert scope zone ID into internal form.
415 * XXX: we may still need to determine the zone later.
417 if (!(so->so_state & SS_ISCONNECTED)) {
418 if (!optp || !optp->ip6po_pktinfo ||
419 !optp->ip6po_pktinfo->ipi6_ifindex)
420 use_defzone = V_ip6_use_defzone;
421 if (dstsock->sin6_scope_id == 0 && !use_defzone)
423 if ((error = sa6_embedscope(dstsock, use_defzone)) != 0)
428 * For an ICMPv6 packet, we should know its type and code to update
431 if (inp->inp_ip_p == IPPROTO_ICMPV6) {
432 struct icmp6_hdr *icmp6;
433 if (m->m_len < sizeof(struct icmp6_hdr) &&
434 (m = m_pullup(m, sizeof(struct icmp6_hdr))) == NULL) {
438 icmp6 = mtod(m, struct icmp6_hdr *);
439 type = icmp6->icmp6_type;
440 code = icmp6->icmp6_code;
443 M_PREPEND(m, sizeof(*ip6), M_NOWAIT);
448 ip6 = mtod(m, struct ip6_hdr *);
451 if (CALC_FLOWID_OUTBOUND) {
452 uint32_t hash_type, hash_val;
454 hash_val = fib6_calc_software_hash(&inp->in6p_laddr,
455 &dstsock->sin6_addr, 0, 0, inp->inp_ip_p, &hash_type);
456 inp->inp_flowid = hash_val;
457 inp->inp_flowtype = hash_type;
461 * Source address selection.
464 error = in6_selectsrc_socket(dstsock, optp, inp, so->so_cred,
465 scope_ambiguous, &in6a, &hlim);
470 error = prison_check_ip6(inp->inp_cred, &in6a);
475 ip6->ip6_dst = dstsock->sin6_addr;
478 * Fill in the rest of the IPv6 header fields.
480 ip6->ip6_flow = (ip6->ip6_flow & ~IPV6_FLOWINFO_MASK) |
481 (inp->inp_flow & IPV6_FLOWINFO_MASK);
482 ip6->ip6_vfc = (ip6->ip6_vfc & ~IPV6_VERSION_MASK) |
483 (IPV6_VERSION & IPV6_VERSION_MASK);
486 * ip6_plen will be filled in ip6_output, so not fill it here.
488 ip6->ip6_nxt = inp->inp_ip_p;
489 ip6->ip6_hlim = hlim;
491 if (inp->inp_ip_p == IPPROTO_ICMPV6 || inp->in6p_cksum != -1) {
496 /* Compute checksum. */
497 if (inp->inp_ip_p == IPPROTO_ICMPV6)
498 off = offsetof(struct icmp6_hdr, icmp6_cksum);
500 off = inp->in6p_cksum;
501 if (plen < off + 2) {
505 off += sizeof(struct ip6_hdr);
508 while (n && n->m_len <= off) {
514 p = (u_int16_t *)(mtod(n, caddr_t) + off);
516 *p = in6_cksum(m, ip6->ip6_nxt, sizeof(*ip6), plen);
520 * Send RA/RS messages to user land for protection, before sending
521 * them to rtadvd/rtsol.
523 if ((send_sendso_input_hook != NULL) &&
524 inp->inp_ip_p == IPPROTO_ICMPV6) {
526 case ND_ROUTER_ADVERT:
527 case ND_ROUTER_SOLICIT:
528 mtag = m_tag_get(PACKET_TAG_ND_OUTGOING,
529 sizeof(unsigned short), M_NOWAIT);
532 m_tag_prepend(m, mtag);
537 error = ip6_output(m, optp, NULL, 0, inp->in6p_moptions, &oifp, inp);
539 if (inp->inp_ip_p == IPPROTO_ICMPV6) {
541 icmp6_ifoutstat_inc(oifp, type, code);
542 ICMP6STAT_INC(icp6s_outhist[type]);
544 RIP6STAT_INC(rip6s_opackets);
553 if (control != NULL) {
554 ip6_clearpktopts(&opt, -1);
568 * Raw IPv6 socket option processing.
571 rip6_ctloutput(struct socket *so, struct sockopt *sopt)
573 struct inpcb *inp = sotoinpcb(so);
576 if (sopt->sopt_level == IPPROTO_ICMPV6)
578 * XXX: is it better to call icmp6_ctloutput() directly
581 return (icmp6_ctloutput(so, sopt));
582 else if (sopt->sopt_level != IPPROTO_IPV6) {
583 if (sopt->sopt_level == SOL_SOCKET &&
584 sopt->sopt_name == SO_SETFIB) {
586 inp->inp_inc.inc_fibnum = so->so_fibnum;
595 switch (sopt->sopt_dir) {
597 switch (sopt->sopt_name) {
605 if (inp->inp_ip_p != IPPROTO_ICMPV6)
607 error = ip6_mrouter_get ? ip6_mrouter_get(so, sopt) :
611 error = ip6_raw_ctloutput(so, sopt);
614 error = ip6_ctloutput(so, sopt);
620 switch (sopt->sopt_name) {
628 if (inp->inp_ip_p != IPPROTO_ICMPV6)
630 error = ip6_mrouter_set ? ip6_mrouter_set(so, sopt) :
634 error = ip6_raw_ctloutput(so, sopt);
637 error = ip6_ctloutput(so, sopt);
647 rip6_attach(struct socket *so, int proto, struct thread *td)
650 struct icmp6_filter *filter;
654 KASSERT(inp == NULL, ("rip6_attach: inp != NULL"));
656 error = priv_check(td, PRIV_NETINET_RAW);
659 if (proto >= IPPROTO_MAX || proto < 0)
660 return (EPROTONOSUPPORT);
661 error = soreserve(so, rip_sendspace, rip_recvspace);
664 filter = malloc(sizeof(struct icmp6_filter), M_PCB, M_NOWAIT);
667 error = in_pcballoc(so, &V_ripcbinfo);
672 inp = (struct inpcb *)so->so_pcb;
673 inp->inp_ip_p = proto;
674 inp->in6p_cksum = -1;
675 inp->in6p_icmp6filt = filter;
676 ICMP6_FILTER_SETPASSALL(inp->in6p_icmp6filt);
682 rip6_detach(struct socket *so)
687 KASSERT(inp != NULL, ("rip6_detach: inp == NULL"));
689 if (so == V_ip6_mrouter && ip6_mrouter_done)
693 free(inp->in6p_icmp6filt, M_PCB);
698 /* XXXRW: This can't ever be called. */
700 rip6_abort(struct socket *so)
702 struct inpcb *inp __diagused;
705 KASSERT(inp != NULL, ("rip6_abort: inp == NULL"));
707 soisdisconnected(so);
711 rip6_close(struct socket *so)
713 struct inpcb *inp __diagused;
716 KASSERT(inp != NULL, ("rip6_close: inp == NULL"));
718 soisdisconnected(so);
722 rip6_disconnect(struct socket *so)
727 KASSERT(inp != NULL, ("rip6_disconnect: inp == NULL"));
729 if ((so->so_state & SS_ISCONNECTED) == 0)
731 inp->in6p_faddr = in6addr_any;
737 rip6_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
739 struct epoch_tracker et;
741 struct sockaddr_in6 *addr = (struct sockaddr_in6 *)nam;
742 struct ifaddr *ifa = NULL;
746 KASSERT(inp != NULL, ("rip6_bind: inp == NULL"));
748 if (nam->sa_family != AF_INET6)
749 return (EAFNOSUPPORT);
750 if (nam->sa_len != sizeof(*addr))
752 if ((error = prison_check_ip6(td->td_ucred, &addr->sin6_addr)) != 0)
754 if (CK_STAILQ_EMPTY(&V_ifnet) || addr->sin6_family != AF_INET6)
755 return (EADDRNOTAVAIL);
756 if ((error = sa6_embedscope(addr, V_ip6_use_defzone)) != 0)
760 if (!IN6_IS_ADDR_UNSPECIFIED(&addr->sin6_addr) &&
761 (ifa = ifa_ifwithaddr((struct sockaddr *)addr)) == NULL) {
763 return (EADDRNOTAVAIL);
766 ((struct in6_ifaddr *)ifa)->ia6_flags &
767 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|
768 IN6_IFF_DETACHED|IN6_IFF_DEPRECATED)) {
770 return (EADDRNOTAVAIL);
774 INP_INFO_WLOCK(&V_ripcbinfo);
775 inp->in6p_laddr = addr->sin6_addr;
776 INP_INFO_WUNLOCK(&V_ripcbinfo);
782 rip6_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
785 struct sockaddr_in6 *addr = (struct sockaddr_in6 *)nam;
786 struct in6_addr in6a;
787 struct epoch_tracker et;
788 int error = 0, scope_ambiguous = 0;
791 KASSERT(inp != NULL, ("rip6_connect: inp == NULL"));
793 if (nam->sa_len != sizeof(*addr))
795 if (CK_STAILQ_EMPTY(&V_ifnet))
796 return (EADDRNOTAVAIL);
797 if (addr->sin6_family != AF_INET6)
798 return (EAFNOSUPPORT);
801 * Application should provide a proper zone ID or the use of default
802 * zone IDs should be enabled. Unfortunately, some applications do
803 * not behave as it should, so we need a workaround. Even if an
804 * appropriate ID is not determined, we'll see if we can determine
805 * the outgoing interface. If we can, determine the zone ID based on
806 * the interface below.
808 if (addr->sin6_scope_id == 0 && !V_ip6_use_defzone)
810 if ((error = sa6_embedscope(addr, V_ip6_use_defzone)) != 0)
814 INP_INFO_WLOCK(&V_ripcbinfo);
815 /* Source address selection. XXX: need pcblookup? */
817 error = in6_selectsrc_socket(addr, inp->in6p_outputopts,
818 inp, so->so_cred, scope_ambiguous, &in6a, NULL);
821 INP_INFO_WUNLOCK(&V_ripcbinfo);
826 inp->in6p_faddr = addr->sin6_addr;
827 inp->in6p_laddr = in6a;
829 INP_INFO_WUNLOCK(&V_ripcbinfo);
835 rip6_shutdown(struct socket *so)
840 KASSERT(inp != NULL, ("rip6_shutdown: inp == NULL"));
848 struct protosw rip6_protosw = {
850 .pr_flags = PR_ATOMIC|PR_ADDR,
851 .pr_ctloutput = rip6_ctloutput,
852 .pr_abort = rip6_abort,
853 .pr_attach = rip6_attach,
854 .pr_bind = rip6_bind,
855 .pr_connect = rip6_connect,
856 .pr_control = in6_control,
857 .pr_detach = rip6_detach,
858 .pr_disconnect = rip6_disconnect,
859 .pr_peeraddr = in6_getpeeraddr,
860 .pr_send = rip6_send,
861 .pr_shutdown = rip6_shutdown,
862 .pr_sockaddr = in6_getsockaddr,
863 .pr_close = rip6_close