2 * Copyright (c) 2004 Jeffrey M. Hsu. All rights reserved.
3 * Copyright (c) 2004 The DragonFly Project. All rights reserved.
5 * This code is derived from software contributed to The DragonFly Project
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of The DragonFly Project nor the names of its
17 * contributors may be used to endorse or promote products derived
18 * from this software without specific, prior written permission.
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21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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30 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995
36 * The Regents of the University of California. All rights reserved.
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39 * modification, are permitted provided that the following conditions
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51 * may be used to endorse or promote products derived from this software
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61 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
62 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
63 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
66 * @(#)udp_usrreq.c 8.6 (Berkeley) 5/23/95
67 * $FreeBSD: src/sys/netinet/udp_usrreq.c,v 1.64.2.18 2003/01/24 05:11:34 sam Exp $
68 * $DragonFly: src/sys/netinet/udp_usrreq.c,v 1.47 2008/11/11 10:46:58 sephe Exp $
71 #include "opt_ipsec.h"
72 #include "opt_inet6.h"
74 #include <sys/param.h>
75 #include <sys/systm.h>
76 #include <sys/kernel.h>
77 #include <sys/malloc.h>
79 #include <sys/domain.h>
82 #include <sys/protosw.h>
83 #include <sys/socket.h>
84 #include <sys/socketvar.h>
85 #include <sys/sysctl.h>
86 #include <sys/syslog.h>
87 #include <sys/in_cksum.h>
89 #include <sys/thread2.h>
90 #include <sys/socketvar2.h>
92 #include <machine/stdarg.h>
95 #include <net/route.h>
96 #include <net/netmsg2.h>
98 #include <netinet/in.h>
99 #include <netinet/in_systm.h>
100 #include <netinet/ip.h>
102 #include <netinet/ip6.h>
104 #include <netinet/in_pcb.h>
105 #include <netinet/in_var.h>
106 #include <netinet/ip_var.h>
108 #include <netinet6/ip6_var.h>
110 #include <netinet/ip_icmp.h>
111 #include <netinet/icmp_var.h>
112 #include <netinet/udp.h>
113 #include <netinet/udp_var.h>
116 #include <netproto/ipsec/ipsec.h>
120 #include <netinet6/ipsec.h>
124 * UDP protocol implementation.
125 * Per RFC 768, August, 1980.
128 static int udpcksum = 1;
130 static int udpcksum = 0; /* XXX */
132 SYSCTL_INT(_net_inet_udp, UDPCTL_CHECKSUM, checksum, CTLFLAG_RW,
136 SYSCTL_INT(_net_inet_udp, OID_AUTO, log_in_vain, CTLFLAG_RW,
137 &log_in_vain, 0, "Log all incoming UDP packets");
139 static int blackhole = 0;
140 SYSCTL_INT(_net_inet_udp, OID_AUTO, blackhole, CTLFLAG_RW,
141 &blackhole, 0, "Do not send port unreachables for refused connects");
143 static int strict_mcast_mship = 1;
144 SYSCTL_INT(_net_inet_udp, OID_AUTO, strict_mcast_mship, CTLFLAG_RW,
145 &strict_mcast_mship, 0, "Only send multicast to member sockets");
147 struct inpcbinfo udbinfo;
150 #define UDBHASHSIZE 16
153 struct udpstat udpstat; /* from udp_var.h */
154 SYSCTL_STRUCT(_net_inet_udp, UDPCTL_STATS, stats, CTLFLAG_RW,
155 &udpstat, udpstat, "UDP statistics (struct udpstat, netinet/udp_var.h)");
157 static struct sockaddr_in udp_in = { sizeof udp_in, AF_INET };
160 struct sockaddr_in6 uin6_sin;
161 u_char uin6_init_done : 1;
163 { sizeof udp_in6.uin6_sin, AF_INET6 },
167 struct ip6_hdr uip6_ip6;
168 u_char uip6_init_done : 1;
172 static void udp_append (struct inpcb *last, struct ip *ip,
173 struct mbuf *n, int off);
175 static void ip_2_ip6_hdr (struct ip6_hdr *ip6, struct ip *ip);
178 static int udp_connect_oncpu(struct socket *so, struct thread *td,
179 struct sockaddr_in *sin, struct sockaddr_in *if_sin);
180 static int udp_output (struct inpcb *, struct mbuf *, struct sockaddr *,
181 struct mbuf *, struct thread *);
186 in_pcbinfo_init(&udbinfo);
187 udbinfo.hashbase = hashinit(UDBHASHSIZE, M_PCB, &udbinfo.hashmask);
188 udbinfo.porthashbase = hashinit(UDBHASHSIZE, M_PCB,
189 &udbinfo.porthashmask);
190 udbinfo.wildcardhashbase = hashinit(UDBHASHSIZE, M_PCB,
191 &udbinfo.wildcardhashmask);
192 udbinfo.ipi_size = sizeof(struct inpcb);
196 * Check multicast packets to make sure they are only sent to sockets with
197 * multicast memberships for the packet's destination address and arrival
198 * interface. Multicast packets to multicast-unaware sockets are also
201 * Returns 0 if the packet is acceptable, -1 if it is not.
204 check_multicast_membership(struct ip *ip, struct inpcb *inp, struct mbuf *m)
207 struct ip_moptions *mopt;
209 if (strict_mcast_mship == 0 ||
210 !IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
213 mopt = inp->inp_moptions;
216 for (mshipno = 0; mshipno <= mopt->imo_num_memberships; ++mshipno) {
217 struct in_multi *maddr = mopt->imo_membership[mshipno];
219 if (ip->ip_dst.s_addr == maddr->inm_addr.s_addr &&
220 m->m_pkthdr.rcvif == maddr->inm_ifp) {
228 udp_input(struct mbuf **mp, int *offp, int proto)
235 struct mbuf *opts = NULL;
238 struct sockaddr *append_sa;
245 udpstat.udps_ipackets++;
248 * Strip IP options, if any; should skip this,
249 * make available to user, and use on returned packets,
250 * but we don't yet have a way to check the checksum
251 * with options still present.
253 if (iphlen > sizeof(struct ip)) {
255 iphlen = sizeof(struct ip);
259 * IP and UDP headers are together in first mbuf.
260 * Already checked and pulled up in ip_demux().
262 KASSERT(m->m_len >= iphlen + sizeof(struct udphdr),
263 ("UDP header not in one mbuf"));
265 ip = mtod(m, struct ip *);
266 uh = (struct udphdr *)((caddr_t)ip + iphlen);
268 /* destination port of 0 is illegal, based on RFC768. */
269 if (uh->uh_dport == 0)
273 * Make mbuf data length reflect UDP length.
274 * If not enough data to reflect UDP length, drop.
276 len = ntohs((u_short)uh->uh_ulen);
277 if (ip->ip_len != len) {
278 if (len > ip->ip_len || len < sizeof(struct udphdr)) {
279 udpstat.udps_badlen++;
282 m_adj(m, len - ip->ip_len);
283 /* ip->ip_len = len; */
286 * Save a copy of the IP header in case we want restore it
287 * for sending an ICMP error message in response.
292 * Checksum extended UDP header and data.
295 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) {
296 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR)
297 uh->uh_sum = m->m_pkthdr.csum_data;
299 uh->uh_sum = in_pseudo(ip->ip_src.s_addr,
300 ip->ip_dst.s_addr, htonl((u_short)len +
301 m->m_pkthdr.csum_data + IPPROTO_UDP));
302 uh->uh_sum ^= 0xffff;
306 bcopy(((struct ipovly *)ip)->ih_x1, b, 9);
307 bzero(((struct ipovly *)ip)->ih_x1, 9);
308 ((struct ipovly *)ip)->ih_len = uh->uh_ulen;
309 uh->uh_sum = in_cksum(m, len + sizeof(struct ip));
310 bcopy(b, ((struct ipovly *)ip)->ih_x1, 9);
313 udpstat.udps_badsum++;
315 return(IPPROTO_DONE);
318 udpstat.udps_nosum++;
320 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) ||
321 in_broadcast(ip->ip_dst, m->m_pkthdr.rcvif)) {
325 * Deliver a multicast or broadcast datagram to *all* sockets
326 * for which the local and remote addresses and ports match
327 * those of the incoming datagram. This allows more than
328 * one process to receive multi/broadcasts on the same port.
329 * (This really ought to be done for unicast datagrams as
330 * well, but that would cause problems with existing
331 * applications that open both address-specific sockets and
332 * a wildcard socket listening to the same port -- they would
333 * end up receiving duplicates of every unicast datagram.
334 * Those applications open the multiple sockets to overcome an
335 * inadequacy of the UDP socket interface, but for backwards
336 * compatibility we avoid the problem here rather than
337 * fixing the interface. Maybe 4.5BSD will remedy this?)
341 * Construct sockaddr format source address.
343 udp_in.sin_port = uh->uh_sport;
344 udp_in.sin_addr = ip->ip_src;
346 * Locate pcb(s) for datagram.
347 * (Algorithm copied from raw_intr().)
351 udp_in6.uin6_init_done = udp_ip6.uip6_init_done = 0;
353 LIST_FOREACH(inp, &udbinfo.pcblisthead, inp_list) {
354 if (inp->inp_flags & INP_PLACEMARKER)
357 if (!(inp->inp_vflag & INP_IPV4))
360 if (inp->inp_lport != uh->uh_dport)
362 if (inp->inp_laddr.s_addr != INADDR_ANY) {
363 if (inp->inp_laddr.s_addr !=
367 if (inp->inp_faddr.s_addr != INADDR_ANY) {
368 if (inp->inp_faddr.s_addr !=
370 inp->inp_fport != uh->uh_sport)
374 if (check_multicast_membership(ip, inp, m) < 0)
381 /* check AH/ESP integrity. */
382 if (ipsec4_in_reject_so(m, last->inp_socket))
383 ipsecstat.in_polvio++;
384 /* do not inject data to pcb */
388 /* check AH/ESP integrity. */
389 if (ipsec4_in_reject(m, last))
392 #endif /*FAST_IPSEC*/
393 if ((n = m_copypacket(m, MB_DONTWAIT)) != NULL)
394 udp_append(last, ip, n,
396 sizeof(struct udphdr));
400 * Don't look for additional matches if this one does
401 * not have either the SO_REUSEPORT or SO_REUSEADDR
402 * socket options set. This heuristic avoids searching
403 * through all pcbs in the common case of a non-shared
404 * port. It * assumes that an application will never
405 * clear these options after setting them.
407 if (!(last->inp_socket->so_options &
408 (SO_REUSEPORT | SO_REUSEADDR)))
414 * No matching pcb found; discard datagram.
415 * (No need to send an ICMP Port Unreachable
416 * for a broadcast or multicast datgram.)
418 udpstat.udps_noportbcast++;
422 /* check AH/ESP integrity. */
423 if (ipsec4_in_reject_so(m, last->inp_socket)) {
424 ipsecstat.in_polvio++;
429 /* check AH/ESP integrity. */
430 if (ipsec4_in_reject(m, last))
432 #endif /*FAST_IPSEC*/
433 udp_append(last, ip, m, iphlen + sizeof(struct udphdr));
434 return(IPPROTO_DONE);
437 * Locate pcb for datagram.
439 inp = in_pcblookup_hash(&udbinfo, ip->ip_src, uh->uh_sport,
440 ip->ip_dst, uh->uh_dport, 1, m->m_pkthdr.rcvif);
443 char buf[sizeof "aaa.bbb.ccc.ddd"];
445 strcpy(buf, inet_ntoa(ip->ip_dst));
447 "Connection attempt to UDP %s:%d from %s:%d\n",
448 buf, ntohs(uh->uh_dport), inet_ntoa(ip->ip_src),
449 ntohs(uh->uh_sport));
451 udpstat.udps_noport++;
452 if (m->m_flags & (M_BCAST | M_MCAST)) {
453 udpstat.udps_noportbcast++;
459 if (badport_bandlim(BANDLIM_ICMP_UNREACH) < 0)
463 ip->ip_len += iphlen;
464 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
465 return(IPPROTO_DONE);
468 if (ipsec4_in_reject_so(m, inp->inp_socket)) {
469 ipsecstat.in_polvio++;
474 if (ipsec4_in_reject(m, inp))
476 #endif /*FAST_IPSEC*/
478 * Check the minimum TTL for socket.
480 if (ip->ip_ttl < inp->inp_ip_minttl)
484 * Construct sockaddr format source address.
485 * Stuff source address and datagram in user buffer.
487 udp_in.sin_port = uh->uh_sport;
488 udp_in.sin_addr = ip->ip_src;
489 if ((inp->inp_flags & INP_CONTROLOPTS) ||
490 (inp->inp_socket->so_options & SO_TIMESTAMP)) {
492 if (inp->inp_vflag & INP_IPV6) {
495 ip_2_ip6_hdr(&udp_ip6.uip6_ip6, ip);
496 savedflags = inp->inp_flags;
497 inp->inp_flags &= ~INP_UNMAPPABLEOPTS;
498 ip6_savecontrol(inp, &opts, &udp_ip6.uip6_ip6, m);
499 inp->inp_flags = savedflags;
502 ip_savecontrol(inp, &opts, ip, m);
504 m_adj(m, iphlen + sizeof(struct udphdr));
506 if (inp->inp_vflag & INP_IPV6) {
507 in6_sin_2_v4mapsin6(&udp_in, &udp_in6.uin6_sin);
508 append_sa = (struct sockaddr *)&udp_in6;
511 append_sa = (struct sockaddr *)&udp_in;
513 lwkt_gettoken(&inp->inp_socket->so_rcv.ssb_token);
514 if (ssb_appendaddr(&inp->inp_socket->so_rcv, append_sa, m, opts) == 0) {
515 udpstat.udps_fullsock++;
516 lwkt_reltoken(&inp->inp_socket->so_rcv.ssb_token);
519 lwkt_reltoken(&inp->inp_socket->so_rcv.ssb_token);
520 sorwakeup(inp->inp_socket);
521 return(IPPROTO_DONE);
526 return(IPPROTO_DONE);
531 ip_2_ip6_hdr(struct ip6_hdr *ip6, struct ip *ip)
533 bzero(ip6, sizeof *ip6);
535 ip6->ip6_vfc = IPV6_VERSION;
536 ip6->ip6_plen = ip->ip_len;
537 ip6->ip6_nxt = ip->ip_p;
538 ip6->ip6_hlim = ip->ip_ttl;
539 ip6->ip6_src.s6_addr32[2] = ip6->ip6_dst.s6_addr32[2] =
541 ip6->ip6_src.s6_addr32[3] = ip->ip_src.s_addr;
542 ip6->ip6_dst.s6_addr32[3] = ip->ip_dst.s_addr;
547 * subroutine of udp_input(), mainly for source code readability.
548 * caller must properly init udp_ip6 and udp_in6 beforehand.
551 udp_append(struct inpcb *last, struct ip *ip, struct mbuf *n, int off)
553 struct sockaddr *append_sa;
554 struct mbuf *opts = NULL;
556 if (last->inp_flags & INP_CONTROLOPTS ||
557 last->inp_socket->so_options & SO_TIMESTAMP) {
559 if (last->inp_vflag & INP_IPV6) {
562 if (udp_ip6.uip6_init_done == 0) {
563 ip_2_ip6_hdr(&udp_ip6.uip6_ip6, ip);
564 udp_ip6.uip6_init_done = 1;
566 savedflags = last->inp_flags;
567 last->inp_flags &= ~INP_UNMAPPABLEOPTS;
568 ip6_savecontrol(last, &opts, &udp_ip6.uip6_ip6, n);
569 last->inp_flags = savedflags;
572 ip_savecontrol(last, &opts, ip, n);
575 if (last->inp_vflag & INP_IPV6) {
576 if (udp_in6.uin6_init_done == 0) {
577 in6_sin_2_v4mapsin6(&udp_in, &udp_in6.uin6_sin);
578 udp_in6.uin6_init_done = 1;
580 append_sa = (struct sockaddr *)&udp_in6.uin6_sin;
583 append_sa = (struct sockaddr *)&udp_in;
585 lwkt_gettoken(&last->inp_socket->so_rcv.ssb_token);
586 if (ssb_appendaddr(&last->inp_socket->so_rcv, append_sa, n, opts) == 0) {
590 udpstat.udps_fullsock++;
592 sorwakeup(last->inp_socket);
594 lwkt_reltoken(&last->inp_socket->so_rcv.ssb_token);
598 * Notify a udp user of an asynchronous error;
599 * just wake up so that he can collect error status.
602 udp_notify(struct inpcb *inp, int error)
604 inp->inp_socket->so_error = error;
605 sorwakeup(inp->inp_socket);
606 sowwakeup(inp->inp_socket);
609 struct netmsg_udp_notify {
610 struct netmsg_base base;
611 void (*nm_notify)(struct inpcb *, int);
612 struct in_addr nm_faddr;
617 udp_notifyall_oncpu(netmsg_t msg)
619 struct netmsg_udp_notify *nm = (struct netmsg_udp_notify *)msg;
624 in_pcbnotifyall(&udbinfo.pcblisthead, nm->nm_faddr,
625 nm->nm_arg, nm->nm_notify);
626 lwkt_replymsg(&nm->base.lmsg, 0);
629 /* XXX currently udp only runs on cpu 0 */
630 nextcpu = mycpuid + 1;
631 if (nextcpu < ncpus2)
632 lwkt_forwardmsg(cpu_portfn(nextcpu), &nm->base.lmsg);
634 lwkt_replymsg(&nmsg->base.lmsg, 0);
639 udp_rtchange(struct inpcb *inp, int err)
642 /* XXX Nuke this, once UDP inpcbs are CPU localized */
643 if (inp->inp_route.ro_rt && inp->inp_route.ro_rt->rt_cpuid == mycpuid) {
644 rtfree(inp->inp_route.ro_rt);
645 inp->inp_route.ro_rt = NULL;
647 * A new route can be allocated the next time
648 * output is attempted.
652 in_rtchange(inp, err);
657 udp_ctlinput(netmsg_t msg)
659 struct sockaddr *sa = msg->ctlinput.nm_arg;
660 struct ip *ip = msg->ctlinput.nm_extra;
661 int cmd = msg->ctlinput.nm_cmd;
663 void (*notify) (struct inpcb *, int) = udp_notify;
664 struct in_addr faddr;
667 faddr = ((struct sockaddr_in *)sa)->sin_addr;
668 if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY)
671 if (PRC_IS_REDIRECT(cmd)) {
673 notify = udp_rtchange;
674 } else if (cmd == PRC_HOSTDEAD) {
676 } else if ((unsigned)cmd >= PRC_NCMDS || inetctlerrmap[cmd] == 0) {
681 uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
682 inp = in_pcblookup_hash(&udbinfo, faddr, uh->uh_dport,
683 ip->ip_src, uh->uh_sport, 0, NULL);
684 if (inp != NULL && inp->inp_socket != NULL)
685 (*notify)(inp, inetctlerrmap[cmd]);
686 } else if (PRC_IS_REDIRECT(cmd)) {
687 struct netmsg_udp_notify *nm;
689 KKASSERT(&curthread->td_msgport == cpu_portfn(0));
690 nm = kmalloc(sizeof(*nm), M_LWKTMSG, M_INTWAIT);
691 netmsg_init(&nm->base, NULL, &netisr_afree_rport,
692 0, udp_notifyall_oncpu);
693 nm->nm_faddr = faddr;
694 nm->nm_arg = inetctlerrmap[cmd];
695 nm->nm_notify = notify;
696 lwkt_sendmsg(cpu_portfn(0), &nm->base.lmsg);
699 * XXX We should forward msg upon PRC_HOSTHEAD and ip == NULL,
700 * once UDP inpcbs are CPU localized
702 KKASSERT(&curthread->td_msgport == cpu_portfn(0));
703 in_pcbnotifyall(&udbinfo.pcblisthead, faddr, inetctlerrmap[cmd],
707 lwkt_replymsg(&msg->lmsg, 0);
710 SYSCTL_PROC(_net_inet_udp, UDPCTL_PCBLIST, pcblist, CTLFLAG_RD, &udbinfo, 0,
711 in_pcblist_global, "S,xinpcb", "List of active UDP sockets");
714 udp_getcred(SYSCTL_HANDLER_ARGS)
716 struct sockaddr_in addrs[2];
720 error = priv_check(req->td, PRIV_ROOT);
723 error = SYSCTL_IN(req, addrs, sizeof addrs);
726 inp = in_pcblookup_hash(&udbinfo, addrs[1].sin_addr, addrs[1].sin_port,
727 addrs[0].sin_addr, addrs[0].sin_port, 1, NULL);
728 if (inp == NULL || inp->inp_socket == NULL) {
732 error = SYSCTL_OUT(req, inp->inp_socket->so_cred, sizeof(struct ucred));
737 SYSCTL_PROC(_net_inet_udp, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW,
738 0, 0, udp_getcred, "S,ucred", "Get the ucred of a UDP connection");
741 udp_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *dstaddr,
742 struct mbuf *control, struct thread *td)
745 int len = m->m_pkthdr.len;
746 struct sockaddr_in *sin; /* really is initialized before use */
747 int error = 0, lport_any = 0;
749 if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) {
754 if (inp->inp_lport == 0) { /* unbound socket */
755 error = in_pcbbind(inp, NULL, td);
758 in_pcbinswildcardhash(inp);
762 if (dstaddr != NULL) { /* destination address specified */
763 if (inp->inp_faddr.s_addr != INADDR_ANY) {
764 /* already connected */
768 sin = (struct sockaddr_in *)dstaddr;
769 if (!prison_remote_ip(td, (struct sockaddr *)&sin)) {
770 error = EAFNOSUPPORT; /* IPv6 only jail */
774 if (inp->inp_faddr.s_addr == INADDR_ANY) {
775 /* no destination specified and not already connected */
783 * Calculate data length and get a mbuf
784 * for UDP and IP headers.
786 M_PREPEND(m, sizeof(struct udpiphdr), MB_DONTWAIT);
793 * Fill in mbuf with extended UDP header
794 * and addresses and length put into network format.
796 ui = mtod(m, struct udpiphdr *);
797 bzero(ui->ui_x1, sizeof ui->ui_x1); /* XXX still needed? */
798 ui->ui_pr = IPPROTO_UDP;
801 * Set destination address.
803 if (dstaddr != NULL) { /* use specified destination */
804 ui->ui_dst = sin->sin_addr;
805 ui->ui_dport = sin->sin_port;
806 } else { /* use connected destination */
807 ui->ui_dst = inp->inp_faddr;
808 ui->ui_dport = inp->inp_fport;
812 * Set source address.
814 if (inp->inp_laddr.s_addr == INADDR_ANY) {
815 struct sockaddr_in *if_sin;
817 if (dstaddr == NULL) {
819 * connect() had (or should have) failed because
820 * the interface had no IP address, but the
821 * application proceeded to call send() anyways.
827 /* Look up outgoing interface. */
828 if ((error = in_pcbladdr(inp, dstaddr, &if_sin, td)))
830 ui->ui_src = if_sin->sin_addr; /* use address of interface */
832 ui->ui_src = inp->inp_laddr; /* use non-null bound address */
834 ui->ui_sport = inp->inp_lport;
835 KASSERT(inp->inp_lport != 0, ("inp lport should have been bound"));
837 ui->ui_ulen = htons((u_short)len + sizeof(struct udphdr));
840 * Set up checksum and output datagram.
843 ui->ui_sum = in_pseudo(ui->ui_src.s_addr, ui->ui_dst.s_addr,
844 htons((u_short)len + sizeof(struct udphdr) + IPPROTO_UDP));
845 m->m_pkthdr.csum_flags = CSUM_UDP;
846 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
850 ((struct ip *)ui)->ip_len = sizeof(struct udpiphdr) + len;
851 ((struct ip *)ui)->ip_ttl = inp->inp_ip_ttl; /* XXX */
852 ((struct ip *)ui)->ip_tos = inp->inp_ip_tos; /* XXX */
853 udpstat.udps_opackets++;
855 error = ip_output(m, inp->inp_options, &inp->inp_route,
856 (inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST)) |
858 inp->inp_moptions, inp);
861 * If this is the first data gram sent on an unbound and unconnected
862 * UDP socket, lport will be changed in this function. If target
863 * CPU after this lport changing is no longer the current CPU, then
864 * free the route entry allocated on the current CPU.
867 if (udp_addrcpu(inp->inp_faddr.s_addr, inp->inp_fport,
868 inp->inp_laddr.s_addr, inp->inp_lport) != mycpuid) {
869 struct route *ro = &inp->inp_route;
871 if (ro->ro_rt != NULL)
873 bzero(ro, sizeof(*ro));
883 u_long udp_sendspace = 9216; /* really max datagram size */
884 /* 40 1K datagrams */
885 SYSCTL_INT(_net_inet_udp, UDPCTL_MAXDGRAM, maxdgram, CTLFLAG_RW,
886 &udp_sendspace, 0, "Maximum outgoing UDP datagram size");
888 u_long udp_recvspace = 40 * (1024 +
890 sizeof(struct sockaddr_in6)
892 sizeof(struct sockaddr_in)
895 SYSCTL_INT(_net_inet_udp, UDPCTL_RECVSPACE, recvspace, CTLFLAG_RW,
896 &udp_recvspace, 0, "Maximum incoming UDP datagram size");
899 * NOTE: (so) is referenced from soabort*() and netmsg_pru_abort()
900 * will sofree() it when we return.
903 udp_abort(netmsg_t msg)
905 struct socket *so = msg->abort.base.nm_so;
911 soisdisconnected(so);
917 lwkt_replymsg(&msg->abort.base.lmsg, error);
921 udp_attach(netmsg_t msg)
923 struct socket *so = msg->attach.base.nm_so;
924 struct pru_attach_info *ai = msg->attach.nm_ai;
933 error = soreserve(so, udp_sendspace, udp_recvspace, ai->sb_rlimit);
936 error = in_pcballoc(so, &udbinfo);
941 * Set default port for protocol processing prior to bind/connect.
943 sosetport(so, cpu_portfn(0));
945 inp = (struct inpcb *)so->so_pcb;
946 inp->inp_vflag |= INP_IPV4;
947 inp->inp_ip_ttl = ip_defttl;
950 lwkt_replymsg(&msg->attach.base.lmsg, error);
954 udp_bind(netmsg_t msg)
956 struct socket *so = msg->bind.base.nm_so;
957 struct sockaddr *nam = msg->bind.nm_nam;
958 struct thread *td = msg->bind.nm_td;
959 struct sockaddr_in *sin = (struct sockaddr_in *)nam;
965 error = in_pcbbind(inp, nam, td);
967 if (sin->sin_addr.s_addr != INADDR_ANY)
968 inp->inp_flags |= INP_WASBOUND_NOTANY;
969 in_pcbinswildcardhash(inp);
974 lwkt_replymsg(&msg->bind.base.lmsg, error);
978 udp_connect(netmsg_t msg)
980 struct socket *so = msg->connect.base.nm_so;
981 struct sockaddr *nam = msg->connect.nm_nam;
982 struct thread *td = msg->connect.nm_td;
984 struct sockaddr_in *sin = (struct sockaddr_in *)nam;
985 struct sockaddr_in *if_sin;
995 if (msg->connect.nm_reconnect & NMSG_RECONNECT_RECONNECT) {
996 msg->connect.nm_reconnect &= ~NMSG_RECONNECT_RECONNECT;
997 in_pcblink(inp, &udbinfo);
1000 if (inp->inp_faddr.s_addr != INADDR_ANY) {
1007 * Bind if we have to
1009 if (td->td_proc && td->td_proc->p_ucred->cr_prison != NULL &&
1010 inp->inp_laddr.s_addr == INADDR_ANY) {
1011 error = in_pcbbind(inp, NULL, td);
1017 * Calculate the correct protocol processing thread. The connect
1018 * operation must run there.
1020 error = in_pcbladdr(inp, nam, &if_sin, td);
1023 if (!prison_remote_ip(td, nam)) {
1024 error = EAFNOSUPPORT; /* IPv6 only jail */
1028 port = udp_addrport(sin->sin_addr.s_addr, sin->sin_port,
1029 inp->inp_laddr.s_addr, inp->inp_lport);
1031 if (port != &curthread->td_msgport) {
1032 struct route *ro = &inp->inp_route;
1034 panic("UDP should only be in one protocol thread %p %p",
1035 port, &curthread->td_msgport);
1038 * in_pcbladdr() may have allocated a route entry for us
1039 * on the current CPU, but we need a route entry on the
1040 * inpcb's owner CPU, so free it here.
1042 if (ro->ro_rt != NULL)
1044 bzero(ro, sizeof(*ro));
1047 * We are moving the protocol processing port the socket
1048 * is on, we have to unlink here and re-link on the
1051 in_pcbunlink(so->so_pcb, &udbinfo);
1052 /* in_pcbunlink(so->so_pcb, &udbinfo[mycpu->gd_cpuid]); */
1053 sosetport(so, port);
1054 msg->connect.nm_reconnect |= NMSG_RECONNECT_RECONNECT;
1055 msg->connect.base.nm_dispatch = udp_connect;
1057 lwkt_forwardmsg(port, &msg->connect.base.lmsg);
1058 /* msg invalid now */
1062 KKASSERT(port == &curthread->td_msgport);
1063 error = udp_connect_oncpu(so, td, sin, if_sin);
1065 KKASSERT(msg->connect.nm_m == NULL);
1066 lwkt_replymsg(&msg->connect.base.lmsg, error);
1070 udp_connect_oncpu(struct socket *so, struct thread *td,
1071 struct sockaddr_in *sin, struct sockaddr_in *if_sin)
1077 if (inp->inp_flags & INP_WILDCARD)
1078 in_pcbremwildcardhash(inp);
1079 error = in_pcbconnect(inp, (struct sockaddr *)sin, td);
1083 * No more errors can occur, finish adjusting the socket
1084 * and change the processing port to reflect the connected
1085 * socket. Once set we can no longer safely mess with the
1089 } else if (error == EAFNOSUPPORT) { /* connection dissolved */
1091 * Follow traditional BSD behavior and retain
1092 * the local port binding. But, fix the old misbehavior
1093 * of overwriting any previously bound local address.
1095 if (!(inp->inp_flags & INP_WASBOUND_NOTANY))
1096 inp->inp_laddr.s_addr = INADDR_ANY;
1097 in_pcbinswildcardhash(inp);
1103 udp_detach(netmsg_t msg)
1105 struct socket *so = msg->detach.base.nm_so;
1116 lwkt_replymsg(&msg->detach.base.lmsg, error);
1120 udp_disconnect(netmsg_t msg)
1122 struct socket *so = msg->disconnect.base.nm_so;
1132 if (inp->inp_faddr.s_addr == INADDR_ANY) {
1138 in_pcbdisconnect(inp);
1139 soclrstate(so, SS_ISCONNECTED); /* XXX */
1142 ro = &inp->inp_route;
1143 if (ro->ro_rt != NULL)
1145 bzero(ro, sizeof(*ro));
1148 lwkt_replymsg(&msg->disconnect.base.lmsg, error);
1152 udp_send(netmsg_t msg)
1154 struct socket *so = msg->send.base.nm_so;
1160 error = udp_output(inp,
1163 msg->send.nm_control,
1166 m_freem(msg->send.nm_m);
1169 msg->send.nm_m = NULL;
1170 lwkt_replymsg(&msg->send.base.lmsg, error);
1174 udp_shutdown(netmsg_t msg)
1176 struct socket *so = msg->shutdown.base.nm_so;
1187 lwkt_replymsg(&msg->shutdown.base.lmsg, error);
1190 struct pr_usrreqs udp_usrreqs = {
1191 .pru_abort = udp_abort,
1192 .pru_accept = pr_generic_notsupp,
1193 .pru_attach = udp_attach,
1194 .pru_bind = udp_bind,
1195 .pru_connect = udp_connect,
1196 .pru_connect2 = pr_generic_notsupp,
1197 .pru_control = in_control_dispatch,
1198 .pru_detach = udp_detach,
1199 .pru_disconnect = udp_disconnect,
1200 .pru_listen = pr_generic_notsupp,
1201 .pru_peeraddr = in_setpeeraddr_dispatch,
1202 .pru_rcvd = pr_generic_notsupp,
1203 .pru_rcvoob = pr_generic_notsupp,
1204 .pru_send = udp_send,
1205 .pru_sense = pru_sense_null,
1206 .pru_shutdown = udp_shutdown,
1207 .pru_sockaddr = in_setsockaddr_dispatch,
1208 .pru_sosend = sosendudp,
1209 .pru_soreceive = soreceive