2 * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995
3 * The Regents of the University of California.
4 * Copyright (c) 2008 Robert N. M. Watson
5 * Copyright (c) 2010-2011 Juniper Networks, Inc.
8 * Portions of this software were developed by Robert N. M. Watson under
9 * contract to Juniper Networks, Inc.
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 4. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * @(#)udp_usrreq.c 8.6 (Berkeley) 5/23/95
38 #include <sys/cdefs.h>
39 __FBSDID("$FreeBSD$");
43 #include "opt_inet6.h"
44 #include "opt_ipsec.h"
46 #include <sys/param.h>
47 #include <sys/domain.h>
48 #include <sys/eventhandler.h>
50 #include <sys/kernel.h>
52 #include <sys/malloc.h>
56 #include <sys/protosw.h>
57 #include <sys/signalvar.h>
58 #include <sys/socket.h>
59 #include <sys/socketvar.h>
61 #include <sys/sysctl.h>
62 #include <sys/syslog.h>
63 #include <sys/systm.h>
68 #include <net/route.h>
70 #include <netinet/in.h>
71 #include <netinet/in_pcb.h>
72 #include <netinet/in_systm.h>
73 #include <netinet/in_var.h>
74 #include <netinet/ip.h>
76 #include <netinet/ip6.h>
78 #include <netinet/ip_icmp.h>
79 #include <netinet/icmp_var.h>
80 #include <netinet/ip_var.h>
81 #include <netinet/ip_options.h>
83 #include <netinet6/ip6_var.h>
85 #include <netinet/udp.h>
86 #include <netinet/udp_var.h>
89 #include <netipsec/ipsec.h>
90 #include <netipsec/esp.h>
93 #include <machine/in_cksum.h>
95 #include <security/mac/mac_framework.h>
98 * UDP protocol implementation.
99 * Per RFC 768, August, 1980.
103 * BSD 4.2 defaulted the udp checksum to be off. Turning off udp checksums
104 * removes the only data integrity mechanism for packets and malformed
105 * packets that would otherwise be discarded due to bad checksums, and may
106 * cause problems (especially for NFS data blocks).
108 static int udp_cksum = 1;
109 SYSCTL_INT(_net_inet_udp, UDPCTL_CHECKSUM, checksum, CTLFLAG_RW, &udp_cksum,
110 0, "compute udp checksum");
112 int udp_log_in_vain = 0;
113 SYSCTL_INT(_net_inet_udp, OID_AUTO, log_in_vain, CTLFLAG_RW,
114 &udp_log_in_vain, 0, "Log all incoming UDP packets");
116 VNET_DEFINE(int, udp_blackhole) = 0;
117 SYSCTL_VNET_INT(_net_inet_udp, OID_AUTO, blackhole, CTLFLAG_RW,
118 &VNET_NAME(udp_blackhole), 0,
119 "Do not send port unreachables for refused connects");
121 u_long udp_sendspace = 9216; /* really max datagram size */
122 /* 40 1K datagrams */
123 SYSCTL_ULONG(_net_inet_udp, UDPCTL_MAXDGRAM, maxdgram, CTLFLAG_RW,
124 &udp_sendspace, 0, "Maximum outgoing UDP datagram size");
126 u_long udp_recvspace = 40 * (1024 +
128 sizeof(struct sockaddr_in6)
130 sizeof(struct sockaddr_in)
134 SYSCTL_ULONG(_net_inet_udp, UDPCTL_RECVSPACE, recvspace, CTLFLAG_RW,
135 &udp_recvspace, 0, "Maximum space for incoming UDP datagrams");
137 VNET_DEFINE(struct inpcbhead, udb); /* from udp_var.h */
138 VNET_DEFINE(struct inpcbinfo, udbinfo);
139 static VNET_DEFINE(uma_zone_t, udpcb_zone);
140 #define V_udpcb_zone VNET(udpcb_zone)
143 #define UDBHASHSIZE 128
146 VNET_DEFINE(struct udpstat, udpstat); /* from udp_var.h */
147 SYSCTL_VNET_STRUCT(_net_inet_udp, UDPCTL_STATS, stats, CTLFLAG_RW,
148 &VNET_NAME(udpstat), udpstat,
149 "UDP statistics (struct udpstat, netinet/udp_var.h)");
152 static void udp_detach(struct socket *so);
153 static int udp_output(struct inpcb *, struct mbuf *, struct sockaddr *,
154 struct mbuf *, struct thread *);
159 #define UF_ESPINUDP_ALL (UF_ESPINUDP_NON_IKE|UF_ESPINUDP)
161 static struct mbuf *udp4_espdecap(struct inpcb *, struct mbuf *, int);
163 #endif /* IPSEC_NAT_T */
167 udp_zone_change(void *tag)
170 uma_zone_set_max(V_udbinfo.ipi_zone, maxsockets);
171 uma_zone_set_max(V_udpcb_zone, maxsockets);
175 udp_inpcb_init(void *mem, int size, int flags)
180 INP_LOCK_INIT(inp, "inp", "udpinp");
188 in_pcbinfo_init(&V_udbinfo, "udp", &V_udb, UDBHASHSIZE, UDBHASHSIZE,
189 "udp_inpcb", udp_inpcb_init, NULL, UMA_ZONE_NOFREE);
190 V_udpcb_zone = uma_zcreate("udpcb", sizeof(struct udpcb),
191 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
192 uma_zone_set_max(V_udpcb_zone, maxsockets);
193 EVENTHANDLER_REGISTER(maxsockets_change, udp_zone_change, NULL,
194 EVENTHANDLER_PRI_ANY);
198 * Kernel module interface for updating udpstat. The argument is an index
199 * into udpstat treated as an array of u_long. While this encodes the
200 * general layout of udpstat into the caller, it doesn't encode its location,
201 * so that future changes to add, for example, per-CPU stats support won't
202 * cause binary compatibility problems for kernel modules.
205 kmod_udpstat_inc(int statnum)
208 (*((u_long *)&V_udpstat + statnum))++;
212 udp_newudpcb(struct inpcb *inp)
216 up = uma_zalloc(V_udpcb_zone, M_NOWAIT | M_ZERO);
224 udp_discardcb(struct udpcb *up)
227 uma_zfree(V_udpcb_zone, up);
235 in_pcbinfo_destroy(&V_udbinfo);
236 uma_zdestroy(V_udpcb_zone);
242 * Subroutine of udp_input(), which appends the provided mbuf chain to the
243 * passed pcb/socket. The caller must provide a sockaddr_in via udp_in that
244 * contains the source address. If the socket ends up being an IPv6 socket,
245 * udp_append() will convert to a sockaddr_in6 before passing the address
246 * into the socket code.
249 udp_append(struct inpcb *inp, struct ip *ip, struct mbuf *n, int off,
250 struct sockaddr_in *udp_in)
252 struct sockaddr *append_sa;
254 struct mbuf *opts = 0;
256 struct sockaddr_in6 udp_in6;
260 INP_LOCK_ASSERT(inp);
263 * Engage the tunneling protocol.
266 if (up->u_tun_func != NULL) {
267 (*up->u_tun_func)(n, off, inp);
274 off += sizeof(struct udphdr);
277 /* Check AH/ESP integrity. */
278 if (ipsec4_in_reject(n, inp)) {
280 V_ipsec4stat.in_polvio++;
285 KASSERT(up != NULL, ("%s: udpcb NULL", __func__));
286 if (up->u_flags & UF_ESPINUDP_ALL) { /* IPSec UDP encaps. */
287 n = udp4_espdecap(inp, n, off);
288 if (n == NULL) /* Consumed. */
291 #endif /* IPSEC_NAT_T */
294 if (mac_inpcb_check_deliver(inp, n) != 0) {
299 if (inp->inp_flags & INP_CONTROLOPTS ||
300 inp->inp_socket->so_options & (SO_TIMESTAMP | SO_BINTIME)) {
302 if (inp->inp_vflag & INP_IPV6)
303 (void)ip6_savecontrol_v4(inp, n, &opts, NULL);
306 ip_savecontrol(inp, &opts, ip, n);
309 if (inp->inp_vflag & INP_IPV6) {
310 bzero(&udp_in6, sizeof(udp_in6));
311 udp_in6.sin6_len = sizeof(udp_in6);
312 udp_in6.sin6_family = AF_INET6;
313 in6_sin_2_v4mapsin6(udp_in, &udp_in6);
314 append_sa = (struct sockaddr *)&udp_in6;
317 append_sa = (struct sockaddr *)udp_in;
320 so = inp->inp_socket;
321 SOCKBUF_LOCK(&so->so_rcv);
322 if (sbappendaddr_locked(&so->so_rcv, append_sa, n, opts) == 0) {
323 SOCKBUF_UNLOCK(&so->so_rcv);
327 UDPSTAT_INC(udps_fullsock);
329 sorwakeup_locked(so);
333 udp_input(struct mbuf *m, int off)
342 struct sockaddr_in udp_in;
343 #ifdef IPFIREWALL_FORWARD
344 struct m_tag *fwd_tag;
347 ifp = m->m_pkthdr.rcvif;
348 UDPSTAT_INC(udps_ipackets);
351 * Strip IP options, if any; should skip this, make available to
352 * user, and use on returned packets, but we don't yet have a way to
353 * check the checksum with options still present.
355 if (iphlen > sizeof (struct ip)) {
356 ip_stripoptions(m, (struct mbuf *)0);
357 iphlen = sizeof(struct ip);
361 * Get IP and UDP header together in first mbuf.
363 ip = mtod(m, struct ip *);
364 if (m->m_len < iphlen + sizeof(struct udphdr)) {
365 if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == 0) {
366 UDPSTAT_INC(udps_hdrops);
369 ip = mtod(m, struct ip *);
371 uh = (struct udphdr *)((caddr_t)ip + iphlen);
374 * Destination port of 0 is illegal, based on RFC768.
376 if (uh->uh_dport == 0)
380 * Construct sockaddr format source address. Stuff source address
381 * and datagram in user buffer.
383 bzero(&udp_in, sizeof(udp_in));
384 udp_in.sin_len = sizeof(udp_in);
385 udp_in.sin_family = AF_INET;
386 udp_in.sin_port = uh->uh_sport;
387 udp_in.sin_addr = ip->ip_src;
390 * Make mbuf data length reflect UDP length. If not enough data to
391 * reflect UDP length, drop.
393 len = ntohs((u_short)uh->uh_ulen);
394 if (ip->ip_len != len) {
395 if (len > ip->ip_len || len < sizeof(struct udphdr)) {
396 UDPSTAT_INC(udps_badlen);
399 m_adj(m, len - ip->ip_len);
400 /* ip->ip_len = len; */
404 * Save a copy of the IP header in case we want restore it for
405 * sending an ICMP error message in response.
407 if (!V_udp_blackhole)
410 memset(&save_ip, 0, sizeof(save_ip));
413 * Checksum extended UDP header and data.
418 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) {
419 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR)
420 uh_sum = m->m_pkthdr.csum_data;
422 uh_sum = in_pseudo(ip->ip_src.s_addr,
423 ip->ip_dst.s_addr, htonl((u_short)len +
424 m->m_pkthdr.csum_data + IPPROTO_UDP));
429 bcopy(((struct ipovly *)ip)->ih_x1, b, 9);
430 bzero(((struct ipovly *)ip)->ih_x1, 9);
431 ((struct ipovly *)ip)->ih_len = uh->uh_ulen;
432 uh_sum = in_cksum(m, len + sizeof (struct ip));
433 bcopy(b, ((struct ipovly *)ip)->ih_x1, 9);
436 UDPSTAT_INC(udps_badsum);
441 UDPSTAT_INC(udps_nosum);
443 #ifdef IPFIREWALL_FORWARD
445 * Grab info from PACKET_TAG_IPFORWARD tag prepended to the chain.
447 fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL);
448 if (fwd_tag != NULL) {
449 struct sockaddr_in *next_hop;
454 next_hop = (struct sockaddr_in *)(fwd_tag + 1);
455 ip->ip_dst = next_hop->sin_addr;
456 uh->uh_dport = ntohs(next_hop->sin_port);
459 * Remove the tag from the packet. We don't need it anymore.
461 m_tag_delete(m, fwd_tag);
465 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) ||
466 in_broadcast(ip->ip_dst, ifp)) {
468 struct ip_moptions *imo;
470 INP_INFO_RLOCK(&V_udbinfo);
472 LIST_FOREACH(inp, &V_udb, inp_list) {
473 if (inp->inp_lport != uh->uh_dport)
476 if ((inp->inp_vflag & INP_IPV4) == 0)
479 if (inp->inp_laddr.s_addr != INADDR_ANY &&
480 inp->inp_laddr.s_addr != ip->ip_dst.s_addr)
482 if (inp->inp_faddr.s_addr != INADDR_ANY &&
483 inp->inp_faddr.s_addr != ip->ip_src.s_addr)
485 if (inp->inp_fport != 0 &&
486 inp->inp_fport != uh->uh_sport)
492 * XXXRW: Because we weren't holding either the inpcb
493 * or the hash lock when we checked for a match
494 * before, we should probably recheck now that the
495 * inpcb lock is held.
499 * Handle socket delivery policy for any-source
500 * and source-specific multicast. [RFC3678]
502 imo = inp->inp_moptions;
503 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
504 struct sockaddr_in group;
510 bzero(&group, sizeof(struct sockaddr_in));
511 group.sin_len = sizeof(struct sockaddr_in);
512 group.sin_family = AF_INET;
513 group.sin_addr = ip->ip_dst;
515 blocked = imo_multi_filter(imo, ifp,
516 (struct sockaddr *)&group,
517 (struct sockaddr *)&udp_in);
518 if (blocked != MCAST_PASS) {
519 if (blocked == MCAST_NOTGMEMBER)
520 IPSTAT_INC(ips_notmember);
521 if (blocked == MCAST_NOTSMEMBER ||
522 blocked == MCAST_MUTED)
523 UDPSTAT_INC(udps_filtermcast);
531 n = m_copy(m, 0, M_COPYALL);
532 udp_append(last, ip, n, iphlen, &udp_in);
537 * Don't look for additional matches if this one does
538 * not have either the SO_REUSEPORT or SO_REUSEADDR
539 * socket options set. This heuristic avoids
540 * searching through all pcbs in the common case of a
541 * non-shared port. It assumes that an application
542 * will never clear these options after setting them.
544 if ((last->inp_socket->so_options &
545 (SO_REUSEPORT|SO_REUSEADDR)) == 0)
551 * No matching pcb found; discard datagram. (No need
552 * to send an ICMP Port Unreachable for a broadcast
553 * or multicast datgram.)
555 UDPSTAT_INC(udps_noportbcast);
558 INP_INFO_RUNLOCK(&V_udbinfo);
561 udp_append(last, ip, m, iphlen, &udp_in);
563 INP_INFO_RUNLOCK(&V_udbinfo);
568 * Locate pcb for datagram.
570 inp = in_pcblookup(&V_udbinfo, ip->ip_src, uh->uh_sport,
571 ip->ip_dst, uh->uh_dport, INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB,
574 if (udp_log_in_vain) {
575 char buf[4*sizeof "123"];
577 strcpy(buf, inet_ntoa(ip->ip_dst));
579 "Connection attempt to UDP %s:%d from %s:%d\n",
580 buf, ntohs(uh->uh_dport), inet_ntoa(ip->ip_src),
581 ntohs(uh->uh_sport));
583 UDPSTAT_INC(udps_noport);
584 if (m->m_flags & (M_BCAST | M_MCAST)) {
585 UDPSTAT_INC(udps_noportbcast);
590 if (badport_bandlim(BANDLIM_ICMP_UNREACH) < 0)
593 ip->ip_len += iphlen;
594 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
599 * Check the minimum TTL for socket.
601 INP_RLOCK_ASSERT(inp);
602 if (inp->inp_ip_minttl && inp->inp_ip_minttl > ip->ip_ttl) {
607 udp_append(inp, ip, m, iphlen, &udp_in);
617 * Notify a udp user of an asynchronous error; just wake up so that they can
618 * collect error status.
621 udp_notify(struct inpcb *inp, int errno)
625 * While udp_ctlinput() always calls udp_notify() with a read lock
626 * when invoking it directly, in_pcbnotifyall() currently uses write
627 * locks due to sharing code with TCP. For now, accept either a read
628 * or a write lock, but a read lock is sufficient.
630 INP_LOCK_ASSERT(inp);
632 inp->inp_socket->so_error = errno;
633 sorwakeup(inp->inp_socket);
634 sowwakeup(inp->inp_socket);
640 udp_ctlinput(int cmd, struct sockaddr *sa, void *vip)
644 struct in_addr faddr;
647 faddr = ((struct sockaddr_in *)sa)->sin_addr;
648 if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY)
652 * Redirects don't need to be handled up here.
654 if (PRC_IS_REDIRECT(cmd))
658 * Hostdead is ugly because it goes linearly through all PCBs.
660 * XXX: We never get this from ICMP, otherwise it makes an excellent
661 * DoS attack on machines with many connections.
663 if (cmd == PRC_HOSTDEAD)
665 else if ((unsigned)cmd >= PRC_NCMDS || inetctlerrmap[cmd] == 0)
668 uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
669 inp = in_pcblookup(&V_udbinfo, faddr, uh->uh_dport,
670 ip->ip_src, uh->uh_sport, INPLOOKUP_RLOCKPCB, NULL);
672 INP_RLOCK_ASSERT(inp);
673 if (inp->inp_socket != NULL) {
674 udp_notify(inp, inetctlerrmap[cmd]);
679 in_pcbnotifyall(&V_udbinfo, faddr, inetctlerrmap[cmd],
685 udp_pcblist(SYSCTL_HANDLER_ARGS)
688 struct inpcb *inp, **inp_list;
693 * The process of preparing the PCB list is too time-consuming and
694 * resource-intensive to repeat twice on every request.
696 if (req->oldptr == 0) {
697 n = V_udbinfo.ipi_count;
698 n += imax(n / 8, 10);
699 req->oldidx = 2 * (sizeof xig) + n * sizeof(struct xinpcb);
703 if (req->newptr != 0)
707 * OK, now we're committed to doing something.
709 INP_INFO_RLOCK(&V_udbinfo);
710 gencnt = V_udbinfo.ipi_gencnt;
711 n = V_udbinfo.ipi_count;
712 INP_INFO_RUNLOCK(&V_udbinfo);
714 error = sysctl_wire_old_buffer(req, 2 * (sizeof xig)
715 + n * sizeof(struct xinpcb));
719 xig.xig_len = sizeof xig;
721 xig.xig_gen = gencnt;
722 xig.xig_sogen = so_gencnt;
723 error = SYSCTL_OUT(req, &xig, sizeof xig);
727 inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK);
731 INP_INFO_RLOCK(&V_udbinfo);
732 for (inp = LIST_FIRST(V_udbinfo.ipi_listhead), i = 0; inp && i < n;
733 inp = LIST_NEXT(inp, inp_list)) {
735 if (inp->inp_gencnt <= gencnt &&
736 cr_canseeinpcb(req->td->td_ucred, inp) == 0) {
742 INP_INFO_RUNLOCK(&V_udbinfo);
746 for (i = 0; i < n; i++) {
749 if (inp->inp_gencnt <= gencnt) {
752 bzero(&xi, sizeof(xi));
753 xi.xi_len = sizeof xi;
754 /* XXX should avoid extra copy */
755 bcopy(inp, &xi.xi_inp, sizeof *inp);
757 sotoxsocket(inp->inp_socket, &xi.xi_socket);
758 xi.xi_inp.inp_gencnt = inp->inp_gencnt;
760 error = SYSCTL_OUT(req, &xi, sizeof xi);
764 INP_INFO_WLOCK(&V_udbinfo);
765 for (i = 0; i < n; i++) {
768 if (!in_pcbrele_rlocked(inp))
771 INP_INFO_WUNLOCK(&V_udbinfo);
775 * Give the user an updated idea of our state. If the
776 * generation differs from what we told her before, she knows
777 * that something happened while we were processing this
778 * request, and it might be necessary to retry.
780 INP_INFO_RLOCK(&V_udbinfo);
781 xig.xig_gen = V_udbinfo.ipi_gencnt;
782 xig.xig_sogen = so_gencnt;
783 xig.xig_count = V_udbinfo.ipi_count;
784 INP_INFO_RUNLOCK(&V_udbinfo);
785 error = SYSCTL_OUT(req, &xig, sizeof xig);
787 free(inp_list, M_TEMP);
791 SYSCTL_PROC(_net_inet_udp, UDPCTL_PCBLIST, pcblist,
792 CTLTYPE_OPAQUE | CTLFLAG_RD, NULL, 0,
793 udp_pcblist, "S,xinpcb", "List of active UDP sockets");
797 udp_getcred(SYSCTL_HANDLER_ARGS)
800 struct sockaddr_in addrs[2];
804 error = priv_check(req->td, PRIV_NETINET_GETCRED);
807 error = SYSCTL_IN(req, addrs, sizeof(addrs));
810 inp = in_pcblookup(&V_udbinfo, addrs[1].sin_addr, addrs[1].sin_port,
811 addrs[0].sin_addr, addrs[0].sin_port,
812 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, NULL);
814 INP_RLOCK_ASSERT(inp);
815 if (inp->inp_socket == NULL)
818 error = cr_canseeinpcb(req->td->td_ucred, inp);
820 cru2x(inp->inp_cred, &xuc);
825 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
829 SYSCTL_PROC(_net_inet_udp, OID_AUTO, getcred,
830 CTLTYPE_OPAQUE|CTLFLAG_RW|CTLFLAG_PRISON, 0, 0,
831 udp_getcred, "S,xucred", "Get the xucred of a UDP connection");
835 udp_ctloutput(struct socket *so, struct sockopt *sopt)
837 int error = 0, optval;
844 KASSERT(inp != NULL, ("%s: inp == NULL", __func__));
846 if (sopt->sopt_level != IPPROTO_UDP) {
848 if (INP_CHECK_SOCKAF(so, AF_INET6)) {
850 error = ip6_ctloutput(so, sopt);
853 #if defined(INET) && defined(INET6)
859 error = ip_ctloutput(so, sopt);
865 switch (sopt->sopt_dir) {
867 switch (sopt->sopt_name) {
870 error = sooptcopyin(sopt, &optval, sizeof optval,
875 KASSERT(inp != NULL, ("%s: inp == NULL", __func__));
879 KASSERT(up != NULL, ("%s: up == NULL", __func__));
883 /* Clear all UDP encap. */
885 up->u_flags &= ~UF_ESPINUDP_ALL;
889 case UDP_ENCAP_ESPINUDP:
890 case UDP_ENCAP_ESPINUDP_NON_IKE:
891 up->u_flags &= ~UF_ESPINUDP_ALL;
892 if (optval == UDP_ENCAP_ESPINUDP)
893 up->u_flags |= UF_ESPINUDP;
894 else if (optval == UDP_ENCAP_ESPINUDP_NON_IKE)
895 up->u_flags |= UF_ESPINUDP_NON_IKE;
911 switch (sopt->sopt_name) {
915 KASSERT(up != NULL, ("%s: up == NULL", __func__));
916 optval = up->u_flags & UF_ESPINUDP_ALL;
918 error = sooptcopyout(sopt, &optval, sizeof optval);
934 #define UH_UNLOCKED 0
936 udp_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *addr,
937 struct mbuf *control, struct thread *td)
940 int len = m->m_pkthdr.len;
941 struct in_addr faddr, laddr;
943 struct sockaddr_in *sin, src;
946 u_short fport, lport;
950 * udp_output() may need to temporarily bind or connect the current
951 * inpcb. As such, we don't know up front whether we will need the
952 * pcbinfo lock or not. Do any work to decide what is needed up
953 * front before acquiring any locks.
955 if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) {
963 if (control != NULL) {
965 * XXX: Currently, we assume all the optional information is
966 * stored in a single mbuf.
968 if (control->m_next) {
973 for (; control->m_len > 0;
974 control->m_data += CMSG_ALIGN(cm->cmsg_len),
975 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) {
976 cm = mtod(control, struct cmsghdr *);
977 if (control->m_len < sizeof(*cm) || cm->cmsg_len == 0
978 || cm->cmsg_len > control->m_len) {
982 if (cm->cmsg_level != IPPROTO_IP)
985 switch (cm->cmsg_type) {
988 CMSG_LEN(sizeof(struct in_addr))) {
992 bzero(&src, sizeof(src));
993 src.sin_family = AF_INET;
994 src.sin_len = sizeof(src);
995 src.sin_port = inp->inp_lport;
997 *(struct in_addr *)CMSG_DATA(cm);
1001 error = ENOPROTOOPT;
1015 * Depending on whether or not the application has bound or connected
1016 * the socket, we may have to do varying levels of work. The optimal
1017 * case is for a connected UDP socket, as a global lock isn't
1020 * In order to decide which we need, we require stability of the
1021 * inpcb binding, which we ensure by acquiring a read lock on the
1022 * inpcb. This doesn't strictly follow the lock order, so we play
1023 * the trylock and retry game; note that we may end up with more
1024 * conservative locks than required the second time around, so later
1025 * assertions have to accept that. Further analysis of the number of
1026 * misses under contention is required.
1028 * XXXRW: Check that hash locking update here is correct.
1030 sin = (struct sockaddr_in *)addr;
1033 (inp->inp_laddr.s_addr == INADDR_ANY && inp->inp_lport == 0)) {
1036 INP_HASH_WLOCK(&V_udbinfo);
1037 unlock_udbinfo = UH_WLOCKED;
1038 } else if ((sin != NULL && (
1039 (sin->sin_addr.s_addr == INADDR_ANY) ||
1040 (sin->sin_addr.s_addr == INADDR_BROADCAST) ||
1041 (inp->inp_laddr.s_addr == INADDR_ANY) ||
1042 (inp->inp_lport == 0))) ||
1043 (src.sin_family == AF_INET)) {
1044 INP_HASH_RLOCK(&V_udbinfo);
1045 unlock_udbinfo = UH_RLOCKED;
1047 unlock_udbinfo = UH_UNLOCKED;
1050 * If the IP_SENDSRCADDR control message was specified, override the
1051 * source address for this datagram. Its use is invalidated if the
1052 * address thus specified is incomplete or clobbers other inpcbs.
1054 laddr = inp->inp_laddr;
1055 lport = inp->inp_lport;
1056 if (src.sin_family == AF_INET) {
1057 INP_HASH_LOCK_ASSERT(&V_udbinfo);
1059 (laddr.s_addr == INADDR_ANY &&
1060 src.sin_addr.s_addr == INADDR_ANY)) {
1064 error = in_pcbbind_setup(inp, (struct sockaddr *)&src,
1065 &laddr.s_addr, &lport, td->td_ucred);
1071 * If a UDP socket has been connected, then a local address/port will
1072 * have been selected and bound.
1074 * If a UDP socket has not been connected to, then an explicit
1075 * destination address must be used, in which case a local
1076 * address/port may not have been selected and bound.
1079 INP_LOCK_ASSERT(inp);
1080 if (inp->inp_faddr.s_addr != INADDR_ANY) {
1086 * Jail may rewrite the destination address, so let it do
1087 * that before we use it.
1089 error = prison_remote_ip4(td->td_ucred, &sin->sin_addr);
1094 * If a local address or port hasn't yet been selected, or if
1095 * the destination address needs to be rewritten due to using
1096 * a special INADDR_ constant, invoke in_pcbconnect_setup()
1097 * to do the heavy lifting. Once a port is selected, we
1098 * commit the binding back to the socket; we also commit the
1099 * binding of the address if in jail.
1101 * If we already have a valid binding and we're not
1102 * requesting a destination address rewrite, use a fast path.
1104 if (inp->inp_laddr.s_addr == INADDR_ANY ||
1105 inp->inp_lport == 0 ||
1106 sin->sin_addr.s_addr == INADDR_ANY ||
1107 sin->sin_addr.s_addr == INADDR_BROADCAST) {
1108 INP_HASH_LOCK_ASSERT(&V_udbinfo);
1109 error = in_pcbconnect_setup(inp, addr, &laddr.s_addr,
1110 &lport, &faddr.s_addr, &fport, NULL,
1116 * XXXRW: Why not commit the port if the address is
1119 /* Commit the local port if newly assigned. */
1120 if (inp->inp_laddr.s_addr == INADDR_ANY &&
1121 inp->inp_lport == 0) {
1122 INP_WLOCK_ASSERT(inp);
1123 INP_HASH_WLOCK_ASSERT(&V_udbinfo);
1125 * Remember addr if jailed, to prevent
1128 if (prison_flag(td->td_ucred, PR_IP4))
1129 inp->inp_laddr = laddr;
1130 inp->inp_lport = lport;
1131 if (in_pcbinshash(inp) != 0) {
1136 inp->inp_flags |= INP_ANONPORT;
1139 faddr = sin->sin_addr;
1140 fport = sin->sin_port;
1143 INP_LOCK_ASSERT(inp);
1144 faddr = inp->inp_faddr;
1145 fport = inp->inp_fport;
1146 if (faddr.s_addr == INADDR_ANY) {
1153 * Calculate data length and get a mbuf for UDP, IP, and possible
1154 * link-layer headers. Immediate slide the data pointer back forward
1155 * since we won't use that space at this layer.
1157 M_PREPEND(m, sizeof(struct udpiphdr) + max_linkhdr, M_DONTWAIT);
1162 m->m_data += max_linkhdr;
1163 m->m_len -= max_linkhdr;
1164 m->m_pkthdr.len -= max_linkhdr;
1167 * Fill in mbuf with extended UDP header and addresses and length put
1168 * into network format.
1170 ui = mtod(m, struct udpiphdr *);
1171 bzero(ui->ui_x1, sizeof(ui->ui_x1)); /* XXX still needed? */
1172 ui->ui_pr = IPPROTO_UDP;
1175 ui->ui_sport = lport;
1176 ui->ui_dport = fport;
1177 ui->ui_ulen = htons((u_short)len + sizeof(struct udphdr));
1180 * Set the Don't Fragment bit in the IP header.
1182 if (inp->inp_flags & INP_DONTFRAG) {
1185 ip = (struct ip *)&ui->ui_i;
1186 ip->ip_off |= IP_DF;
1190 if (inp->inp_socket->so_options & SO_DONTROUTE)
1191 ipflags |= IP_ROUTETOIF;
1192 if (inp->inp_socket->so_options & SO_BROADCAST)
1193 ipflags |= IP_ALLOWBROADCAST;
1194 if (inp->inp_flags & INP_ONESBCAST)
1195 ipflags |= IP_SENDONES;
1198 mac_inpcb_create_mbuf(inp, m);
1202 * Set up checksum and output datagram.
1205 if (inp->inp_flags & INP_ONESBCAST)
1206 faddr.s_addr = INADDR_BROADCAST;
1207 ui->ui_sum = in_pseudo(ui->ui_src.s_addr, faddr.s_addr,
1208 htons((u_short)len + sizeof(struct udphdr) + IPPROTO_UDP));
1209 m->m_pkthdr.csum_flags = CSUM_UDP;
1210 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
1213 ((struct ip *)ui)->ip_len = sizeof (struct udpiphdr) + len;
1214 ((struct ip *)ui)->ip_ttl = inp->inp_ip_ttl; /* XXX */
1215 ((struct ip *)ui)->ip_tos = inp->inp_ip_tos; /* XXX */
1216 UDPSTAT_INC(udps_opackets);
1218 if (unlock_udbinfo == UH_WLOCKED)
1219 INP_HASH_WUNLOCK(&V_udbinfo);
1220 else if (unlock_udbinfo == UH_RLOCKED)
1221 INP_HASH_RUNLOCK(&V_udbinfo);
1222 error = ip_output(m, inp->inp_options, NULL, ipflags,
1223 inp->inp_moptions, inp);
1224 if (unlock_udbinfo == UH_WLOCKED)
1231 if (unlock_udbinfo == UH_WLOCKED) {
1232 INP_HASH_WUNLOCK(&V_udbinfo);
1234 } else if (unlock_udbinfo == UH_RLOCKED) {
1235 INP_HASH_RUNLOCK(&V_udbinfo);
1244 #if defined(IPSEC) && defined(IPSEC_NAT_T)
1246 * Potentially decap ESP in UDP frame. Check for an ESP header
1247 * and optional marker; if present, strip the UDP header and
1248 * push the result through IPSec.
1250 * Returns mbuf to be processed (potentially re-allocated) or
1251 * NULL if consumed and/or processed.
1253 static struct mbuf *
1254 udp4_espdecap(struct inpcb *inp, struct mbuf *m, int off)
1256 size_t minlen, payload, skip, iphlen;
1260 struct udphdr *udphdr;
1263 INP_RLOCK_ASSERT(inp);
1266 * Pull up data so the longest case is contiguous:
1267 * IP/UDP hdr + non ESP marker + ESP hdr.
1269 minlen = off + sizeof(uint64_t) + sizeof(struct esp);
1270 if (minlen > m->m_pkthdr.len)
1271 minlen = m->m_pkthdr.len;
1272 if ((m = m_pullup(m, minlen)) == NULL) {
1273 V_ipsec4stat.in_inval++;
1274 return (NULL); /* Bypass caller processing. */
1276 data = mtod(m, caddr_t); /* Points to ip header. */
1277 payload = m->m_len - off; /* Size of payload. */
1279 if (payload == 1 && data[off] == '\xff')
1280 return (m); /* NB: keepalive packet, no decap. */
1282 up = intoudpcb(inp);
1283 KASSERT(up != NULL, ("%s: udpcb NULL", __func__));
1284 KASSERT((up->u_flags & UF_ESPINUDP_ALL) != 0,
1285 ("u_flags 0x%x", up->u_flags));
1288 * Check that the payload is large enough to hold an
1289 * ESP header and compute the amount of data to remove.
1291 * NB: the caller has already done a pullup for us.
1292 * XXX can we assume alignment and eliminate bcopys?
1294 if (up->u_flags & UF_ESPINUDP_NON_IKE) {
1296 * draft-ietf-ipsec-nat-t-ike-0[01].txt and
1297 * draft-ietf-ipsec-udp-encaps-(00/)01.txt, ignoring
1298 * possible AH mode non-IKE marker+non-ESP marker
1299 * from draft-ietf-ipsec-udp-encaps-00.txt.
1303 if (payload <= sizeof(uint64_t) + sizeof(struct esp))
1304 return (m); /* NB: no decap. */
1305 bcopy(data + off, &marker, sizeof(uint64_t));
1306 if (marker != 0) /* Non-IKE marker. */
1307 return (m); /* NB: no decap. */
1308 skip = sizeof(uint64_t) + sizeof(struct udphdr);
1312 if (payload <= sizeof(struct esp)) {
1313 V_ipsec4stat.in_inval++;
1315 return (NULL); /* Discard. */
1317 bcopy(data + off, &spi, sizeof(uint32_t));
1318 if (spi == 0) /* Non-ESP marker. */
1319 return (m); /* NB: no decap. */
1320 skip = sizeof(struct udphdr);
1324 * Setup a PACKET_TAG_IPSEC_NAT_T_PORT tag to remember
1325 * the UDP ports. This is required if we want to select
1326 * the right SPD for multiple hosts behind same NAT.
1328 * NB: ports are maintained in network byte order everywhere
1329 * in the NAT-T code.
1331 tag = m_tag_get(PACKET_TAG_IPSEC_NAT_T_PORTS,
1332 2 * sizeof(uint16_t), M_NOWAIT);
1334 V_ipsec4stat.in_nomem++;
1336 return (NULL); /* Discard. */
1338 iphlen = off - sizeof(struct udphdr);
1339 udphdr = (struct udphdr *)(data + iphlen);
1340 ((uint16_t *)(tag + 1))[0] = udphdr->uh_sport;
1341 ((uint16_t *)(tag + 1))[1] = udphdr->uh_dport;
1342 m_tag_prepend(m, tag);
1345 * Remove the UDP header (and possibly the non ESP marker)
1346 * IP header length is iphlen
1349 * +----+------+-----+
1350 * | IP | UDP | ESP |
1351 * +----+------+-----+
1359 ovbcopy(data, data + skip, iphlen);
1362 ip = mtod(m, struct ip *);
1364 ip->ip_p = IPPROTO_ESP;
1367 * We cannot yet update the cksums so clear any
1368 * h/w cksum flags as they are no longer valid.
1370 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID)
1371 m->m_pkthdr.csum_flags &= ~(CSUM_DATA_VALID|CSUM_PSEUDO_HDR);
1373 (void) ipsec4_common_input(m, iphlen, ip->ip_p);
1374 return (NULL); /* NB: consumed, bypass processing. */
1376 #endif /* defined(IPSEC) && defined(IPSEC_NAT_T) */
1379 udp_abort(struct socket *so)
1383 inp = sotoinpcb(so);
1384 KASSERT(inp != NULL, ("udp_abort: inp == NULL"));
1386 if (inp->inp_faddr.s_addr != INADDR_ANY) {
1387 INP_HASH_WLOCK(&V_udbinfo);
1388 in_pcbdisconnect(inp);
1389 inp->inp_laddr.s_addr = INADDR_ANY;
1390 INP_HASH_WUNLOCK(&V_udbinfo);
1391 soisdisconnected(so);
1397 udp_attach(struct socket *so, int proto, struct thread *td)
1402 inp = sotoinpcb(so);
1403 KASSERT(inp == NULL, ("udp_attach: inp != NULL"));
1404 error = soreserve(so, udp_sendspace, udp_recvspace);
1407 INP_INFO_WLOCK(&V_udbinfo);
1408 error = in_pcballoc(so, &V_udbinfo);
1410 INP_INFO_WUNLOCK(&V_udbinfo);
1414 inp = sotoinpcb(so);
1415 inp->inp_vflag |= INP_IPV4;
1416 inp->inp_ip_ttl = V_ip_defttl;
1418 error = udp_newudpcb(inp);
1422 INP_INFO_WUNLOCK(&V_udbinfo);
1427 INP_INFO_WUNLOCK(&V_udbinfo);
1433 udp_set_kernel_tunneling(struct socket *so, udp_tun_func_t f)
1438 KASSERT(so->so_type == SOCK_DGRAM,
1439 ("udp_set_kernel_tunneling: !dgram"));
1440 inp = sotoinpcb(so);
1441 KASSERT(inp != NULL, ("udp_set_kernel_tunneling: inp == NULL"));
1443 up = intoudpcb(inp);
1444 if (up->u_tun_func != NULL) {
1455 udp_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
1460 inp = sotoinpcb(so);
1461 KASSERT(inp != NULL, ("udp_bind: inp == NULL"));
1463 INP_HASH_WLOCK(&V_udbinfo);
1464 error = in_pcbbind(inp, nam, td->td_ucred);
1465 INP_HASH_WUNLOCK(&V_udbinfo);
1471 udp_close(struct socket *so)
1475 inp = sotoinpcb(so);
1476 KASSERT(inp != NULL, ("udp_close: inp == NULL"));
1478 if (inp->inp_faddr.s_addr != INADDR_ANY) {
1479 INP_HASH_WLOCK(&V_udbinfo);
1480 in_pcbdisconnect(inp);
1481 inp->inp_laddr.s_addr = INADDR_ANY;
1482 INP_HASH_WUNLOCK(&V_udbinfo);
1483 soisdisconnected(so);
1489 udp_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
1493 struct sockaddr_in *sin;
1495 inp = sotoinpcb(so);
1496 KASSERT(inp != NULL, ("udp_connect: inp == NULL"));
1498 if (inp->inp_faddr.s_addr != INADDR_ANY) {
1502 sin = (struct sockaddr_in *)nam;
1503 error = prison_remote_ip4(td->td_ucred, &sin->sin_addr);
1508 INP_HASH_WLOCK(&V_udbinfo);
1509 error = in_pcbconnect(inp, nam, td->td_ucred);
1510 INP_HASH_WUNLOCK(&V_udbinfo);
1518 udp_detach(struct socket *so)
1523 inp = sotoinpcb(so);
1524 KASSERT(inp != NULL, ("udp_detach: inp == NULL"));
1525 KASSERT(inp->inp_faddr.s_addr == INADDR_ANY,
1526 ("udp_detach: not disconnected"));
1527 INP_INFO_WLOCK(&V_udbinfo);
1529 up = intoudpcb(inp);
1530 KASSERT(up != NULL, ("%s: up == NULL", __func__));
1531 inp->inp_ppcb = NULL;
1534 INP_INFO_WUNLOCK(&V_udbinfo);
1539 udp_disconnect(struct socket *so)
1543 inp = sotoinpcb(so);
1544 KASSERT(inp != NULL, ("udp_disconnect: inp == NULL"));
1546 if (inp->inp_faddr.s_addr == INADDR_ANY) {
1550 INP_HASH_WLOCK(&V_udbinfo);
1551 in_pcbdisconnect(inp);
1552 inp->inp_laddr.s_addr = INADDR_ANY;
1553 INP_HASH_WUNLOCK(&V_udbinfo);
1555 so->so_state &= ~SS_ISCONNECTED; /* XXX */
1562 udp_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
1563 struct mbuf *control, struct thread *td)
1567 inp = sotoinpcb(so);
1568 KASSERT(inp != NULL, ("udp_send: inp == NULL"));
1569 return (udp_output(inp, m, addr, control, td));
1574 udp_shutdown(struct socket *so)
1578 inp = sotoinpcb(so);
1579 KASSERT(inp != NULL, ("udp_shutdown: inp == NULL"));
1587 struct pr_usrreqs udp_usrreqs = {
1588 .pru_abort = udp_abort,
1589 .pru_attach = udp_attach,
1590 .pru_bind = udp_bind,
1591 .pru_connect = udp_connect,
1592 .pru_control = in_control,
1593 .pru_detach = udp_detach,
1594 .pru_disconnect = udp_disconnect,
1595 .pru_peeraddr = in_getpeeraddr,
1596 .pru_send = udp_send,
1597 .pru_soreceive = soreceive_dgram,
1598 .pru_sosend = sosend_dgram,
1599 .pru_shutdown = udp_shutdown,
1600 .pru_sockaddr = in_getsockaddr,
1601 .pru_sosetlabel = in_pcbsosetlabel,
1602 .pru_close = udp_close,