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
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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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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 inpcbhead, ripcb);
123 VNET_DECLARE(struct inpcbinfo, ripcbinfo);
124 #define V_ripcb VNET(ripcb)
125 #define V_ripcbinfo VNET(ripcbinfo)
127 extern u_long rip_sendspace;
128 extern u_long rip_recvspace;
130 VNET_PCPUSTAT_DEFINE(struct rip6stat, rip6stat);
131 VNET_PCPUSTAT_SYSINIT(rip6stat);
134 VNET_PCPUSTAT_SYSUNINIT(rip6stat);
138 * Hooks for multicast routing. They all default to NULL, so leave them not
139 * initialized and rely on BSS being set to 0.
143 * The socket used to communicate with the multicast routing daemon.
145 VNET_DEFINE(struct socket *, ip6_mrouter);
148 * The various mrouter functions.
150 int (*ip6_mrouter_set)(struct socket *, struct sockopt *);
151 int (*ip6_mrouter_get)(struct socket *, struct sockopt *);
152 int (*ip6_mrouter_done)(void);
153 int (*ip6_mforward)(struct ip6_hdr *, struct ifnet *, struct mbuf *);
154 int (*mrt6_ioctl)(u_long, caddr_t);
157 * Setup generic address and protocol structures for raw_input routine, then
158 * pass them along with mbuf chain.
161 rip6_input(struct mbuf **mp, int *offp, int proto)
164 struct mbuf *m = *mp;
165 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
167 struct inpcb *last = NULL;
168 struct mbuf *opts = NULL;
169 struct sockaddr_in6 fromsa;
173 RIP6STAT_INC(rip6s_ipackets);
175 init_sin6(&fromsa, m, 0); /* general init */
177 ifp = m->m_pkthdr.rcvif;
179 CK_LIST_FOREACH(inp, &V_ripcb, inp_list) {
180 /* XXX inp locking */
181 if ((inp->inp_vflag & INP_IPV6) == 0)
184 inp->inp_ip_p != proto)
186 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) &&
187 !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &ip6->ip6_dst))
189 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) &&
190 !IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &ip6->ip6_src))
193 struct mbuf *n = m_copym(m, 0, M_COPYALL, M_NOWAIT);
195 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
197 * Check AH/ESP integrity.
199 if (IPSEC_ENABLED(ipv6)) {
201 IPSEC_CHECK_POLICY(ipv6, n, last) != 0) {
203 /* Do not inject data into pcb. */
209 if (last->inp_flags & INP_CONTROLOPTS ||
210 last->inp_socket->so_options & SO_TIMESTAMP)
211 ip6_savecontrol(last, n, &opts);
212 /* strip intermediate headers */
214 if (sbappendaddr(&last->inp_socket->so_rcv,
215 (struct sockaddr *)&fromsa,
217 soroverflow(last->inp_socket);
221 RIP6STAT_INC(rip6s_fullsock);
223 sorwakeup(last->inp_socket);
230 if (__predict_false(inp->inp_flags2 & INP_FREED))
232 if (jailed_without_vnet(inp->inp_cred)) {
234 * Allow raw socket in jail to receive multicast;
235 * assume process had PRIV_NETINET_RAW at attach,
236 * and fall through into normal filter path if so.
238 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) &&
239 prison_check_ip6(inp->inp_cred,
243 if (inp->in6p_cksum != -1) {
244 RIP6STAT_INC(rip6s_isum);
245 if (m->m_pkthdr.len - (*offp + inp->in6p_cksum) < 2 ||
246 in6_cksum(m, proto, *offp,
247 m->m_pkthdr.len - *offp)) {
248 RIP6STAT_INC(rip6s_badsum);
250 * Drop the received message, don't send an
251 * ICMP6 message. Set proto to IPPROTO_NONE
254 proto = IPPROTO_NONE;
259 * If this raw socket has multicast state, and we
260 * have received a multicast, check if this socket
261 * should receive it, as multicast filtering is now
262 * the responsibility of the transport layer.
264 if (inp->in6p_moptions &&
265 IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
267 * If the incoming datagram is for MLD, allow it
268 * through unconditionally to the raw socket.
270 * Use the M_RTALERT_MLD flag to check for MLD
271 * traffic without having to inspect the mbuf chain
272 * more deeply, as all MLDv1/v2 host messages MUST
273 * contain the Router Alert option.
275 * In the case of MLDv1, we may not have explicitly
276 * joined the group, and may have set IFF_ALLMULTI
277 * on the interface. im6o_mc_filter() may discard
278 * control traffic we actually need to see.
280 * Userland multicast routing daemons should continue
281 * filter the control traffic appropriately.
285 blocked = MCAST_PASS;
286 if ((m->m_flags & M_RTALERT_MLD) == 0) {
287 struct sockaddr_in6 mcaddr;
289 bzero(&mcaddr, sizeof(struct sockaddr_in6));
290 mcaddr.sin6_len = sizeof(struct sockaddr_in6);
291 mcaddr.sin6_family = AF_INET6;
292 mcaddr.sin6_addr = ip6->ip6_dst;
294 blocked = im6o_mc_filter(inp->in6p_moptions,
296 (struct sockaddr *)&mcaddr,
297 (struct sockaddr *)&fromsa);
299 if (blocked != MCAST_PASS) {
300 IP6STAT_INC(ip6s_notmember);
309 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
311 * Check AH/ESP integrity.
313 if (IPSEC_ENABLED(ipv6) && last != NULL &&
314 IPSEC_CHECK_POLICY(ipv6, m, last) != 0) {
316 IP6STAT_DEC(ip6s_delivered);
317 /* Do not inject data into pcb. */
322 if (last->inp_flags & INP_CONTROLOPTS ||
323 last->inp_socket->so_options & SO_TIMESTAMP)
324 ip6_savecontrol(last, m, &opts);
325 /* Strip intermediate headers. */
327 if (sbappendaddr(&last->inp_socket->so_rcv,
328 (struct sockaddr *)&fromsa, m, opts) == 0) {
329 soroverflow(last->inp_socket);
333 RIP6STAT_INC(rip6s_fullsock);
335 sorwakeup(last->inp_socket);
338 RIP6STAT_INC(rip6s_nosock);
339 if (m->m_flags & M_MCAST)
340 RIP6STAT_INC(rip6s_nosockmcast);
341 if (proto == IPPROTO_NONE)
344 icmp6_error(m, ICMP6_PARAM_PROB,
345 ICMP6_PARAMPROB_NEXTHEADER,
346 ip6_get_prevhdr(m, *offp));
347 IP6STAT_DEC(ip6s_delivered);
349 return (IPPROTO_DONE);
353 rip6_ctlinput(int cmd, struct sockaddr *sa, void *d)
355 struct ip6ctlparam *ip6cp = NULL;
356 const struct sockaddr_in6 *sa6_src = NULL;
358 struct inpcb *(*notify)(struct inpcb *, int) = in6_rtchange;
360 if (sa->sa_family != AF_INET6 ||
361 sa->sa_len != sizeof(struct sockaddr_in6))
364 if ((unsigned)cmd >= PRC_NCMDS)
366 if (PRC_IS_REDIRECT(cmd))
367 notify = in6_rtchange, d = NULL;
368 else if (cmd == PRC_HOSTDEAD)
370 else if (inet6ctlerrmap[cmd] == 0)
374 * If the parameter is from icmp6, decode it.
377 ip6cp = (struct ip6ctlparam *)d;
378 cmdarg = ip6cp->ip6c_cmdarg;
379 sa6_src = ip6cp->ip6c_src;
385 (void) in6_pcbnotify(&V_ripcbinfo, sa, 0,
386 (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify);
390 * Generate IPv6 header and pass packet to ip6_output. Tack on options user
391 * may have setup with control call.
394 rip6_output(struct mbuf *m, struct socket *so, ...)
396 struct epoch_tracker et;
397 struct mbuf *control;
399 struct sockaddr_in6 *dstsock;
402 u_int plen = m->m_pkthdr.len;
404 struct ip6_pktopts opt, *optp;
405 struct ifnet *oifp = NULL;
406 int type = 0, code = 0; /* for ICMPv6 output statistics only */
407 int scope_ambiguous = 0;
410 struct in6_addr in6a;
414 dstsock = va_arg(ap, struct sockaddr_in6 *);
415 control = va_arg(ap, struct mbuf *);
421 if (control != NULL) {
423 error = ip6_setpktopts(control, &opt,
424 inp->in6p_outputopts, so->so_cred,
425 so->so_proto->pr_protocol);
433 optp = inp->in6p_outputopts;
436 * Check and convert scope zone ID into internal form.
438 * XXX: we may still need to determine the zone later.
440 if (!(so->so_state & SS_ISCONNECTED)) {
441 if (!optp || !optp->ip6po_pktinfo ||
442 !optp->ip6po_pktinfo->ipi6_ifindex)
443 use_defzone = V_ip6_use_defzone;
444 if (dstsock->sin6_scope_id == 0 && !use_defzone)
446 if ((error = sa6_embedscope(dstsock, use_defzone)) != 0)
451 * For an ICMPv6 packet, we should know its type and code to update
454 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) {
455 struct icmp6_hdr *icmp6;
456 if (m->m_len < sizeof(struct icmp6_hdr) &&
457 (m = m_pullup(m, sizeof(struct icmp6_hdr))) == NULL) {
461 icmp6 = mtod(m, struct icmp6_hdr *);
462 type = icmp6->icmp6_type;
463 code = icmp6->icmp6_code;
466 M_PREPEND(m, sizeof(*ip6), M_NOWAIT);
471 ip6 = mtod(m, struct ip6_hdr *);
474 if (CALC_FLOWID_OUTBOUND) {
475 uint32_t hash_type, hash_val;
477 hash_val = fib6_calc_software_hash(&inp->in6p_laddr,
478 &dstsock->sin6_addr, 0, 0, so->so_proto->pr_protocol,
480 inp->inp_flowid = hash_val;
481 inp->inp_flowtype = hash_type;
485 * Source address selection.
488 error = in6_selectsrc_socket(dstsock, optp, inp, so->so_cred,
489 scope_ambiguous, &in6a, &hlim);
494 error = prison_check_ip6(inp->inp_cred, &in6a);
499 ip6->ip6_dst = dstsock->sin6_addr;
502 * Fill in the rest of the IPv6 header fields.
504 ip6->ip6_flow = (ip6->ip6_flow & ~IPV6_FLOWINFO_MASK) |
505 (inp->inp_flow & IPV6_FLOWINFO_MASK);
506 ip6->ip6_vfc = (ip6->ip6_vfc & ~IPV6_VERSION_MASK) |
507 (IPV6_VERSION & IPV6_VERSION_MASK);
510 * ip6_plen will be filled in ip6_output, so not fill it here.
512 ip6->ip6_nxt = inp->inp_ip_p;
513 ip6->ip6_hlim = hlim;
515 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6 ||
516 inp->in6p_cksum != -1) {
521 /* Compute checksum. */
522 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6)
523 off = offsetof(struct icmp6_hdr, icmp6_cksum);
525 off = inp->in6p_cksum;
526 if (plen < off + 2) {
530 off += sizeof(struct ip6_hdr);
533 while (n && n->m_len <= off) {
539 p = (u_int16_t *)(mtod(n, caddr_t) + off);
541 *p = in6_cksum(m, ip6->ip6_nxt, sizeof(*ip6), plen);
545 * Send RA/RS messages to user land for protection, before sending
546 * them to rtadvd/rtsol.
548 if ((send_sendso_input_hook != NULL) &&
549 so->so_proto->pr_protocol == IPPROTO_ICMPV6) {
551 case ND_ROUTER_ADVERT:
552 case ND_ROUTER_SOLICIT:
553 mtag = m_tag_get(PACKET_TAG_ND_OUTGOING,
554 sizeof(unsigned short), M_NOWAIT);
557 m_tag_prepend(m, mtag);
562 error = ip6_output(m, optp, NULL, 0, inp->in6p_moptions, &oifp, inp);
564 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) {
566 icmp6_ifoutstat_inc(oifp, type, code);
567 ICMP6STAT_INC(icp6s_outhist[type]);
569 RIP6STAT_INC(rip6s_opackets);
578 if (control != NULL) {
579 ip6_clearpktopts(&opt, -1);
587 * Raw IPv6 socket option processing.
590 rip6_ctloutput(struct socket *so, struct sockopt *sopt)
595 if (sopt->sopt_level == IPPROTO_ICMPV6)
597 * XXX: is it better to call icmp6_ctloutput() directly
600 return (icmp6_ctloutput(so, sopt));
601 else if (sopt->sopt_level != IPPROTO_IPV6) {
602 if (sopt->sopt_level == SOL_SOCKET &&
603 sopt->sopt_name == SO_SETFIB) {
606 inp->inp_inc.inc_fibnum = so->so_fibnum;
615 switch (sopt->sopt_dir) {
617 switch (sopt->sopt_name) {
625 error = ip6_mrouter_get ? ip6_mrouter_get(so, sopt) :
629 error = ip6_raw_ctloutput(so, sopt);
632 error = ip6_ctloutput(so, sopt);
638 switch (sopt->sopt_name) {
646 error = ip6_mrouter_set ? ip6_mrouter_set(so, sopt) :
650 error = ip6_raw_ctloutput(so, sopt);
653 error = ip6_ctloutput(so, sopt);
663 rip6_attach(struct socket *so, int proto, struct thread *td)
666 struct icmp6_filter *filter;
670 KASSERT(inp == NULL, ("rip6_attach: inp != NULL"));
672 error = priv_check(td, PRIV_NETINET_RAW);
675 error = soreserve(so, rip_sendspace, rip_recvspace);
678 filter = malloc(sizeof(struct icmp6_filter), M_PCB, M_NOWAIT);
681 INP_INFO_WLOCK(&V_ripcbinfo);
682 error = in_pcballoc(so, &V_ripcbinfo);
684 INP_INFO_WUNLOCK(&V_ripcbinfo);
688 inp = (struct inpcb *)so->so_pcb;
689 INP_INFO_WUNLOCK(&V_ripcbinfo);
690 inp->inp_vflag |= INP_IPV6;
691 inp->inp_ip_p = (long)proto;
692 inp->in6p_hops = -1; /* use kernel default */
693 inp->in6p_cksum = -1;
694 inp->in6p_icmp6filt = filter;
695 ICMP6_FILTER_SETPASSALL(inp->in6p_icmp6filt);
701 rip6_detach(struct socket *so)
706 KASSERT(inp != NULL, ("rip6_detach: inp == NULL"));
708 if (so == V_ip6_mrouter && ip6_mrouter_done)
711 INP_INFO_WLOCK(&V_ripcbinfo);
713 free(inp->in6p_icmp6filt, M_PCB);
716 INP_INFO_WUNLOCK(&V_ripcbinfo);
719 /* XXXRW: This can't ever be called. */
721 rip6_abort(struct socket *so)
726 KASSERT(inp != NULL, ("rip6_abort: inp == NULL"));
728 soisdisconnected(so);
732 rip6_close(struct socket *so)
737 KASSERT(inp != NULL, ("rip6_close: inp == NULL"));
739 soisdisconnected(so);
743 rip6_disconnect(struct socket *so)
748 KASSERT(inp != NULL, ("rip6_disconnect: inp == NULL"));
750 if ((so->so_state & SS_ISCONNECTED) == 0)
752 inp->in6p_faddr = in6addr_any;
758 rip6_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
760 struct epoch_tracker et;
762 struct sockaddr_in6 *addr = (struct sockaddr_in6 *)nam;
763 struct ifaddr *ifa = NULL;
767 KASSERT(inp != NULL, ("rip6_bind: inp == NULL"));
769 if (nam->sa_family != AF_INET6)
770 return (EAFNOSUPPORT);
771 if (nam->sa_len != sizeof(*addr))
773 if ((error = prison_check_ip6(td->td_ucred, &addr->sin6_addr)) != 0)
775 if (CK_STAILQ_EMPTY(&V_ifnet) || addr->sin6_family != AF_INET6)
776 return (EADDRNOTAVAIL);
777 if ((error = sa6_embedscope(addr, V_ip6_use_defzone)) != 0)
781 if (!IN6_IS_ADDR_UNSPECIFIED(&addr->sin6_addr) &&
782 (ifa = ifa_ifwithaddr((struct sockaddr *)addr)) == NULL) {
784 return (EADDRNOTAVAIL);
787 ((struct in6_ifaddr *)ifa)->ia6_flags &
788 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|
789 IN6_IFF_DETACHED|IN6_IFF_DEPRECATED)) {
791 return (EADDRNOTAVAIL);
795 INP_INFO_WLOCK(&V_ripcbinfo);
796 inp->in6p_laddr = addr->sin6_addr;
797 INP_INFO_WUNLOCK(&V_ripcbinfo);
803 rip6_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
806 struct sockaddr_in6 *addr = (struct sockaddr_in6 *)nam;
807 struct in6_addr in6a;
808 struct epoch_tracker et;
809 int error = 0, scope_ambiguous = 0;
812 KASSERT(inp != NULL, ("rip6_connect: inp == NULL"));
814 if (nam->sa_len != sizeof(*addr))
816 if (CK_STAILQ_EMPTY(&V_ifnet))
817 return (EADDRNOTAVAIL);
818 if (addr->sin6_family != AF_INET6)
819 return (EAFNOSUPPORT);
822 * Application should provide a proper zone ID or the use of default
823 * zone IDs should be enabled. Unfortunately, some applications do
824 * not behave as it should, so we need a workaround. Even if an
825 * appropriate ID is not determined, we'll see if we can determine
826 * the outgoing interface. If we can, determine the zone ID based on
827 * the interface below.
829 if (addr->sin6_scope_id == 0 && !V_ip6_use_defzone)
831 if ((error = sa6_embedscope(addr, V_ip6_use_defzone)) != 0)
834 INP_INFO_WLOCK(&V_ripcbinfo);
836 /* Source address selection. XXX: need pcblookup? */
838 error = in6_selectsrc_socket(addr, inp->in6p_outputopts,
839 inp, so->so_cred, scope_ambiguous, &in6a, NULL);
843 INP_INFO_WUNLOCK(&V_ripcbinfo);
847 inp->in6p_faddr = addr->sin6_addr;
848 inp->in6p_laddr = in6a;
851 INP_INFO_WUNLOCK(&V_ripcbinfo);
856 rip6_shutdown(struct socket *so)
861 KASSERT(inp != NULL, ("rip6_shutdown: inp == NULL"));
870 rip6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
871 struct mbuf *control, struct thread *td)
874 struct sockaddr_in6 tmp;
875 struct sockaddr_in6 *dst;
879 KASSERT(inp != NULL, ("rip6_send: inp == NULL"));
881 /* Always copy sockaddr to avoid overwrites. */
883 if (so->so_state & SS_ISCONNECTED) {
889 bzero(&tmp, sizeof(tmp));
890 tmp.sin6_family = AF_INET6;
891 tmp.sin6_len = sizeof(struct sockaddr_in6);
893 bcopy(&inp->in6p_faddr, &tmp.sin6_addr,
894 sizeof(struct in6_addr));
901 else if (nam->sa_family != AF_INET6)
902 error = EAFNOSUPPORT;
903 else if (nam->sa_len != sizeof(struct sockaddr_in6))
907 tmp = *(struct sockaddr_in6 *)nam;
910 if (dst->sin6_family == AF_UNSPEC) {
912 * XXX: we allow this case for backward
913 * compatibility to buggy applications that
914 * rely on old (and wrong) kernel behavior.
916 log(LOG_INFO, "rip6 SEND: address family is "
917 "unspec. Assume AF_INET6\n");
918 dst->sin6_family = AF_INET6;
919 } else if (dst->sin6_family != AF_INET6) {
920 error = EAFNOSUPPORT;
924 return (rip6_output(m, so, dst, control));
933 struct pr_usrreqs rip6_usrreqs = {
934 .pru_abort = rip6_abort,
935 .pru_attach = rip6_attach,
936 .pru_bind = rip6_bind,
937 .pru_connect = rip6_connect,
938 .pru_control = in6_control,
939 .pru_detach = rip6_detach,
940 .pru_disconnect = rip6_disconnect,
941 .pru_peeraddr = in6_getpeeraddr,
942 .pru_send = rip6_send,
943 .pru_shutdown = rip6_shutdown,
944 .pru_sockaddr = in6_getsockaddr,
945 .pru_close = rip6_close,