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.
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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
24 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
25 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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28 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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.
38 * Redistribution and use in source and binary forms, with or without
39 * modification, are permitted provided that the following conditions
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42 * notice, this list of conditions and the following disclaimer.
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48 * This product includes software developed by the University of
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51 * may be used to endorse or promote products derived from this software
52 * without specific prior written permission.
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55 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
56 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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60 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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/thread2.h>
88 #include <sys/in_cksum.h>
90 #include <machine/stdarg.h>
92 #include <vm/vm_zone.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>
123 int udp_mpsafe_proto = 0;
124 TUNABLE_INT("net.inet.udp.mpsafe_proto", &udp_mpsafe_proto);
126 int udp_mpsafe_thread = NETMSG_SERVICE_ADAPTIVE;
127 TUNABLE_INT("net.inet.udp.mpsafe_thread", &udp_mpsafe_thread);
128 SYSCTL_INT(_net_inet_udp, OID_AUTO, mpsafe_thread, CTLFLAG_RW,
129 &udp_mpsafe_thread, 0,
130 "0:BGL, 1:Adaptive BGL, 2:No BGL(experimental)");
133 * UDP protocol implementation.
134 * Per RFC 768, August, 1980.
137 static int udpcksum = 1;
139 static int udpcksum = 0; /* XXX */
141 SYSCTL_INT(_net_inet_udp, UDPCTL_CHECKSUM, checksum, CTLFLAG_RW,
145 SYSCTL_INT(_net_inet_udp, OID_AUTO, log_in_vain, CTLFLAG_RW,
146 &log_in_vain, 0, "Log all incoming UDP packets");
148 static int blackhole = 0;
149 SYSCTL_INT(_net_inet_udp, OID_AUTO, blackhole, CTLFLAG_RW,
150 &blackhole, 0, "Do not send port unreachables for refused connects");
152 static int strict_mcast_mship = 1;
153 SYSCTL_INT(_net_inet_udp, OID_AUTO, strict_mcast_mship, CTLFLAG_RW,
154 &strict_mcast_mship, 0, "Only send multicast to member sockets");
156 struct inpcbinfo udbinfo;
159 #define UDBHASHSIZE 16
162 struct udpstat udpstat; /* from udp_var.h */
163 SYSCTL_STRUCT(_net_inet_udp, UDPCTL_STATS, stats, CTLFLAG_RW,
164 &udpstat, udpstat, "UDP statistics (struct udpstat, netinet/udp_var.h)");
166 static struct sockaddr_in udp_in = { sizeof udp_in, AF_INET };
169 struct sockaddr_in6 uin6_sin;
170 u_char uin6_init_done : 1;
172 { sizeof udp_in6.uin6_sin, AF_INET6 },
176 struct ip6_hdr uip6_ip6;
177 u_char uip6_init_done : 1;
181 static void udp_append (struct inpcb *last, struct ip *ip,
182 struct mbuf *n, int off);
184 static void ip_2_ip6_hdr (struct ip6_hdr *ip6, struct ip *ip);
187 static int udp_connect_oncpu(struct socket *so, struct thread *td,
188 struct sockaddr_in *sin, struct sockaddr_in *if_sin);
189 static int udp_detach (struct socket *so);
190 static int udp_output (struct inpcb *, struct mbuf *, struct sockaddr *,
191 struct mbuf *, struct thread *);
196 in_pcbinfo_init(&udbinfo);
197 udbinfo.hashbase = hashinit(UDBHASHSIZE, M_PCB, &udbinfo.hashmask);
198 udbinfo.porthashbase = hashinit(UDBHASHSIZE, M_PCB,
199 &udbinfo.porthashmask);
200 udbinfo.wildcardhashbase = hashinit(UDBHASHSIZE, M_PCB,
201 &udbinfo.wildcardhashmask);
202 udbinfo.ipi_zone = zinit("udpcb", sizeof(struct inpcb), maxsockets,
208 * Check multicast packets to make sure they are only sent to sockets with
209 * multicast memberships for the packet's destination address and arrival
210 * interface. Multicast packets to multicast-unaware sockets are also
213 * Returns 0 if the packet is acceptable, -1 if it is not.
216 check_multicast_membership(struct ip *ip, struct inpcb *inp, struct mbuf *m)
219 struct ip_moptions *mopt;
221 if (strict_mcast_mship == 0 ||
222 !IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
225 mopt = inp->inp_moptions;
228 for (mshipno = 0; mshipno <= mopt->imo_num_memberships; ++mshipno) {
229 struct in_multi *maddr = mopt->imo_membership[mshipno];
231 if (ip->ip_dst.s_addr == maddr->inm_addr.s_addr &&
232 m->m_pkthdr.rcvif == maddr->inm_ifp) {
240 udp_input(struct mbuf *m, ...)
246 struct mbuf *opts = NULL;
249 struct sockaddr *append_sa;
253 off = __va_arg(ap, int);
254 proto = __va_arg(ap, int);
258 udpstat.udps_ipackets++;
261 * Strip IP options, if any; should skip this,
262 * make available to user, and use on returned packets,
263 * but we don't yet have a way to check the checksum
264 * with options still present.
266 if (iphlen > sizeof(struct ip)) {
268 iphlen = sizeof(struct ip);
272 * IP and UDP headers are together in first mbuf.
273 * Already checked and pulled up in ip_demux().
275 KASSERT(m->m_len >= iphlen + sizeof(struct udphdr),
276 ("UDP header not in one mbuf"));
278 ip = mtod(m, struct ip *);
279 uh = (struct udphdr *)((caddr_t)ip + iphlen);
281 /* destination port of 0 is illegal, based on RFC768. */
282 if (uh->uh_dport == 0)
286 * Make mbuf data length reflect UDP length.
287 * If not enough data to reflect UDP length, drop.
289 len = ntohs((u_short)uh->uh_ulen);
290 if (ip->ip_len != len) {
291 if (len > ip->ip_len || len < sizeof(struct udphdr)) {
292 udpstat.udps_badlen++;
295 m_adj(m, len - ip->ip_len);
296 /* ip->ip_len = len; */
299 * Save a copy of the IP header in case we want restore it
300 * for sending an ICMP error message in response.
305 * Checksum extended UDP header and data.
308 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) {
309 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR)
310 uh->uh_sum = m->m_pkthdr.csum_data;
312 uh->uh_sum = in_pseudo(ip->ip_src.s_addr,
313 ip->ip_dst.s_addr, htonl((u_short)len +
314 m->m_pkthdr.csum_data + IPPROTO_UDP));
315 uh->uh_sum ^= 0xffff;
319 bcopy(((struct ipovly *)ip)->ih_x1, b, 9);
320 bzero(((struct ipovly *)ip)->ih_x1, 9);
321 ((struct ipovly *)ip)->ih_len = uh->uh_ulen;
322 uh->uh_sum = in_cksum(m, len + sizeof(struct ip));
323 bcopy(b, ((struct ipovly *)ip)->ih_x1, 9);
326 udpstat.udps_badsum++;
331 udpstat.udps_nosum++;
333 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) ||
334 in_broadcast(ip->ip_dst, m->m_pkthdr.rcvif)) {
338 * Deliver a multicast or broadcast datagram to *all* sockets
339 * for which the local and remote addresses and ports match
340 * those of the incoming datagram. This allows more than
341 * one process to receive multi/broadcasts on the same port.
342 * (This really ought to be done for unicast datagrams as
343 * well, but that would cause problems with existing
344 * applications that open both address-specific sockets and
345 * a wildcard socket listening to the same port -- they would
346 * end up receiving duplicates of every unicast datagram.
347 * Those applications open the multiple sockets to overcome an
348 * inadequacy of the UDP socket interface, but for backwards
349 * compatibility we avoid the problem here rather than
350 * fixing the interface. Maybe 4.5BSD will remedy this?)
354 * Construct sockaddr format source address.
356 udp_in.sin_port = uh->uh_sport;
357 udp_in.sin_addr = ip->ip_src;
359 * Locate pcb(s) for datagram.
360 * (Algorithm copied from raw_intr().)
364 udp_in6.uin6_init_done = udp_ip6.uip6_init_done = 0;
366 LIST_FOREACH(inp, &udbinfo.pcblisthead, inp_list) {
367 if (inp->inp_flags & INP_PLACEMARKER)
370 if (!(inp->inp_vflag & INP_IPV4))
373 if (inp->inp_lport != uh->uh_dport)
375 if (inp->inp_laddr.s_addr != INADDR_ANY) {
376 if (inp->inp_laddr.s_addr !=
380 if (inp->inp_faddr.s_addr != INADDR_ANY) {
381 if (inp->inp_faddr.s_addr !=
383 inp->inp_fport != uh->uh_sport)
387 if (check_multicast_membership(ip, inp, m) < 0)
394 /* check AH/ESP integrity. */
395 if (ipsec4_in_reject_so(m, last->inp_socket))
396 ipsecstat.in_polvio++;
397 /* do not inject data to pcb */
401 /* check AH/ESP integrity. */
402 if (ipsec4_in_reject(m, last))
405 #endif /*FAST_IPSEC*/
406 if ((n = m_copypacket(m, MB_DONTWAIT)) != NULL)
407 udp_append(last, ip, n,
409 sizeof(struct udphdr));
413 * Don't look for additional matches if this one does
414 * not have either the SO_REUSEPORT or SO_REUSEADDR
415 * socket options set. This heuristic avoids searching
416 * through all pcbs in the common case of a non-shared
417 * port. It * assumes that an application will never
418 * clear these options after setting them.
420 if (!(last->inp_socket->so_options &
421 (SO_REUSEPORT | SO_REUSEADDR)))
427 * No matching pcb found; discard datagram.
428 * (No need to send an ICMP Port Unreachable
429 * for a broadcast or multicast datgram.)
431 udpstat.udps_noportbcast++;
435 /* check AH/ESP integrity. */
436 if (ipsec4_in_reject_so(m, last->inp_socket)) {
437 ipsecstat.in_polvio++;
442 /* check AH/ESP integrity. */
443 if (ipsec4_in_reject(m, last))
445 #endif /*FAST_IPSEC*/
446 udp_append(last, ip, m, iphlen + sizeof(struct udphdr));
450 * Locate pcb for datagram.
452 inp = in_pcblookup_hash(&udbinfo, ip->ip_src, uh->uh_sport,
453 ip->ip_dst, uh->uh_dport, 1, m->m_pkthdr.rcvif);
456 char buf[sizeof "aaa.bbb.ccc.ddd"];
458 strcpy(buf, inet_ntoa(ip->ip_dst));
460 "Connection attempt to UDP %s:%d from %s:%d\n",
461 buf, ntohs(uh->uh_dport), inet_ntoa(ip->ip_src),
462 ntohs(uh->uh_sport));
464 udpstat.udps_noport++;
465 if (m->m_flags & (M_BCAST | M_MCAST)) {
466 udpstat.udps_noportbcast++;
472 if (badport_bandlim(BANDLIM_ICMP_UNREACH) < 0)
476 ip->ip_len += iphlen;
477 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
481 if (ipsec4_in_reject_so(m, inp->inp_socket)) {
482 ipsecstat.in_polvio++;
487 if (ipsec4_in_reject(m, inp))
489 #endif /*FAST_IPSEC*/
491 * Check the minimum TTL for socket.
493 if (ip->ip_ttl < inp->inp_ip_minttl)
497 * Construct sockaddr format source address.
498 * Stuff source address and datagram in user buffer.
500 udp_in.sin_port = uh->uh_sport;
501 udp_in.sin_addr = ip->ip_src;
502 if ((inp->inp_flags & INP_CONTROLOPTS) ||
503 (inp->inp_socket->so_options & SO_TIMESTAMP)) {
505 if (inp->inp_vflag & INP_IPV6) {
508 ip_2_ip6_hdr(&udp_ip6.uip6_ip6, ip);
509 savedflags = inp->inp_flags;
510 inp->inp_flags &= ~INP_UNMAPPABLEOPTS;
511 ip6_savecontrol(inp, &opts, &udp_ip6.uip6_ip6, m);
512 inp->inp_flags = savedflags;
515 ip_savecontrol(inp, &opts, ip, m);
517 m_adj(m, iphlen + sizeof(struct udphdr));
519 if (inp->inp_vflag & INP_IPV6) {
520 in6_sin_2_v4mapsin6(&udp_in, &udp_in6.uin6_sin);
521 append_sa = (struct sockaddr *)&udp_in6;
524 append_sa = (struct sockaddr *)&udp_in;
525 if (ssb_appendaddr(&inp->inp_socket->so_rcv, append_sa, m, opts) == 0) {
526 udpstat.udps_fullsock++;
529 sorwakeup(inp->inp_socket);
540 ip_2_ip6_hdr(struct ip6_hdr *ip6, struct ip *ip)
542 bzero(ip6, sizeof *ip6);
544 ip6->ip6_vfc = IPV6_VERSION;
545 ip6->ip6_plen = ip->ip_len;
546 ip6->ip6_nxt = ip->ip_p;
547 ip6->ip6_hlim = ip->ip_ttl;
548 ip6->ip6_src.s6_addr32[2] = ip6->ip6_dst.s6_addr32[2] =
550 ip6->ip6_src.s6_addr32[3] = ip->ip_src.s_addr;
551 ip6->ip6_dst.s6_addr32[3] = ip->ip_dst.s_addr;
556 * subroutine of udp_input(), mainly for source code readability.
557 * caller must properly init udp_ip6 and udp_in6 beforehand.
560 udp_append(struct inpcb *last, struct ip *ip, struct mbuf *n, int off)
562 struct sockaddr *append_sa;
563 struct mbuf *opts = NULL;
565 if (last->inp_flags & INP_CONTROLOPTS ||
566 last->inp_socket->so_options & SO_TIMESTAMP) {
568 if (last->inp_vflag & INP_IPV6) {
571 if (udp_ip6.uip6_init_done == 0) {
572 ip_2_ip6_hdr(&udp_ip6.uip6_ip6, ip);
573 udp_ip6.uip6_init_done = 1;
575 savedflags = last->inp_flags;
576 last->inp_flags &= ~INP_UNMAPPABLEOPTS;
577 ip6_savecontrol(last, &opts, &udp_ip6.uip6_ip6, n);
578 last->inp_flags = savedflags;
581 ip_savecontrol(last, &opts, ip, n);
584 if (last->inp_vflag & INP_IPV6) {
585 if (udp_in6.uin6_init_done == 0) {
586 in6_sin_2_v4mapsin6(&udp_in, &udp_in6.uin6_sin);
587 udp_in6.uin6_init_done = 1;
589 append_sa = (struct sockaddr *)&udp_in6.uin6_sin;
592 append_sa = (struct sockaddr *)&udp_in;
594 if (ssb_appendaddr(&last->inp_socket->so_rcv, append_sa, n, opts) == 0) {
598 udpstat.udps_fullsock++;
600 sorwakeup(last->inp_socket);
604 * Notify a udp user of an asynchronous error;
605 * just wake up so that he can collect error status.
608 udp_notify(struct inpcb *inp, int error)
610 inp->inp_socket->so_error = error;
611 sorwakeup(inp->inp_socket);
612 sowwakeup(inp->inp_socket);
615 struct netmsg_udp_notify {
616 struct netmsg nm_nmsg;
617 void (*nm_notify)(struct inpcb *, int);
618 struct in_addr nm_faddr;
623 udp_notifyall_oncpu(struct netmsg *netmsg)
625 struct netmsg_udp_notify *nmsg = (struct netmsg_udp_notify *)netmsg;
628 in_pcbnotifyall(&udbinfo.pcblisthead, nmsg->nm_faddr, nmsg->nm_arg,
631 nextcpu = mycpuid + 1;
632 if (nextcpu < ncpus2)
633 lwkt_forwardmsg(udp_cport(nextcpu), &netmsg->nm_lmsg);
635 lwkt_replymsg(&netmsg->nm_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(int cmd, struct sockaddr *sa, void *vip)
661 void (*notify) (struct inpcb *, int) = udp_notify;
662 struct in_addr faddr;
665 faddr = ((struct sockaddr_in *)sa)->sin_addr;
666 if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY)
669 if (PRC_IS_REDIRECT(cmd)) {
671 notify = udp_rtchange;
672 } else if (cmd == PRC_HOSTDEAD)
674 else if ((unsigned)cmd >= PRC_NCMDS || inetctlerrmap[cmd] == 0)
678 uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
679 inp = in_pcblookup_hash(&udbinfo, faddr, uh->uh_dport,
680 ip->ip_src, uh->uh_sport, 0, NULL);
681 if (inp != NULL && inp->inp_socket != NULL)
682 (*notify)(inp, inetctlerrmap[cmd]);
684 } else if (PRC_IS_REDIRECT(cmd)) {
685 struct netmsg_udp_notify nmsg;
687 KKASSERT(&curthread->td_msgport == cpu_portfn(0));
688 netmsg_init(&nmsg.nm_nmsg, NULL, &curthread->td_msgport,
689 0, udp_notifyall_oncpu);
690 nmsg.nm_faddr = faddr;
691 nmsg.nm_arg = inetctlerrmap[cmd];
692 nmsg.nm_notify = notify;
694 lwkt_domsg(udp_cport(0), &nmsg.nm_nmsg.nm_lmsg, 0);
697 * XXX We should forward msg upon PRC_HOSTHEAD and ip == NULL,
698 * once UDP inpcbs are CPU localized
700 KKASSERT(&curthread->td_msgport == udp_cport(0));
701 in_pcbnotifyall(&udbinfo.pcblisthead, faddr, inetctlerrmap[cmd],
706 SYSCTL_PROC(_net_inet_udp, UDPCTL_PCBLIST, pcblist, CTLFLAG_RD, &udbinfo, 0,
707 in_pcblist_global, "S,xinpcb", "List of active UDP sockets");
710 udp_getcred(SYSCTL_HANDLER_ARGS)
712 struct sockaddr_in addrs[2];
716 error = priv_check(req->td, PRIV_ROOT);
719 error = SYSCTL_IN(req, addrs, sizeof addrs);
723 inp = in_pcblookup_hash(&udbinfo, addrs[1].sin_addr, addrs[1].sin_port,
724 addrs[0].sin_addr, addrs[0].sin_port, 1, NULL);
725 if (inp == NULL || inp->inp_socket == NULL) {
729 error = SYSCTL_OUT(req, inp->inp_socket->so_cred, sizeof(struct ucred));
735 SYSCTL_PROC(_net_inet_udp, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW,
736 0, 0, udp_getcred, "S,ucred", "Get the ucred of a UDP connection");
739 udp_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *dstaddr,
740 struct mbuf *control, struct thread *td)
743 int len = m->m_pkthdr.len;
744 struct sockaddr_in *sin; /* really is initialized before use */
745 int error = 0, lport_any = 0;
747 if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) {
752 if (inp->inp_lport == 0) { /* unbound socket */
753 error = in_pcbbind(inp, NULL, td);
756 in_pcbinswildcardhash(inp);
760 if (dstaddr != NULL) { /* destination address specified */
761 if (inp->inp_faddr.s_addr != INADDR_ANY) {
762 /* already connected */
766 sin = (struct sockaddr_in *)dstaddr;
767 if (!prison_remote_ip(td, (struct sockaddr *)&sin)) {
768 error = EAFNOSUPPORT; /* IPv6 only jail */
772 if (inp->inp_faddr.s_addr == INADDR_ANY) {
773 /* no destination specified and not already connected */
781 * Calculate data length and get a mbuf
782 * for UDP and IP headers.
784 M_PREPEND(m, sizeof(struct udpiphdr), MB_DONTWAIT);
791 * Fill in mbuf with extended UDP header
792 * and addresses and length put into network format.
794 ui = mtod(m, struct udpiphdr *);
795 bzero(ui->ui_x1, sizeof ui->ui_x1); /* XXX still needed? */
796 ui->ui_pr = IPPROTO_UDP;
799 * Set destination address.
801 if (dstaddr != NULL) { /* use specified destination */
802 ui->ui_dst = sin->sin_addr;
803 ui->ui_dport = sin->sin_port;
804 } else { /* use connected destination */
805 ui->ui_dst = inp->inp_faddr;
806 ui->ui_dport = inp->inp_fport;
810 * Set source address.
812 if (inp->inp_laddr.s_addr == INADDR_ANY) {
813 struct sockaddr_in *if_sin;
815 if (dstaddr == NULL) {
817 * connect() had (or should have) failed because
818 * the interface had no IP address, but the
819 * application proceeded to call send() anyways.
825 /* Look up outgoing interface. */
826 if ((error = in_pcbladdr(inp, dstaddr, &if_sin, td)))
828 ui->ui_src = if_sin->sin_addr; /* use address of interface */
830 ui->ui_src = inp->inp_laddr; /* use non-null bound address */
832 ui->ui_sport = inp->inp_lport;
833 KASSERT(inp->inp_lport != 0, ("inp lport should have been bound"));
835 ui->ui_ulen = htons((u_short)len + sizeof(struct udphdr));
838 * Set up checksum and output datagram.
841 ui->ui_sum = in_pseudo(ui->ui_src.s_addr, ui->ui_dst.s_addr,
842 htons((u_short)len + sizeof(struct udphdr) + IPPROTO_UDP));
843 m->m_pkthdr.csum_flags = CSUM_UDP;
844 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
848 ((struct ip *)ui)->ip_len = sizeof(struct udpiphdr) + len;
849 ((struct ip *)ui)->ip_ttl = inp->inp_ip_ttl; /* XXX */
850 ((struct ip *)ui)->ip_tos = inp->inp_ip_tos; /* XXX */
851 udpstat.udps_opackets++;
853 error = ip_output(m, inp->inp_options, &inp->inp_route,
854 (inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST)) |
856 inp->inp_moptions, inp);
859 * If this is the first data gram sent on an unbound and unconnected
860 * UDP socket, lport will be changed in this function. If target
861 * CPU after this lport changing is no longer the current CPU, then
862 * free the route entry allocated on the current CPU.
865 if (udp_addrcpu(inp->inp_faddr.s_addr, inp->inp_fport,
866 inp->inp_laddr.s_addr, inp->inp_lport) != mycpuid) {
867 struct route *ro = &inp->inp_route;
869 if (ro->ro_rt != NULL)
871 bzero(ro, sizeof(*ro));
881 u_long udp_sendspace = 9216; /* really max datagram size */
882 /* 40 1K datagrams */
883 SYSCTL_INT(_net_inet_udp, UDPCTL_MAXDGRAM, maxdgram, CTLFLAG_RW,
884 &udp_sendspace, 0, "Maximum outgoing UDP datagram size");
886 u_long udp_recvspace = 40 * (1024 +
888 sizeof(struct sockaddr_in6)
890 sizeof(struct sockaddr_in)
893 SYSCTL_INT(_net_inet_udp, UDPCTL_RECVSPACE, recvspace, CTLFLAG_RW,
894 &udp_recvspace, 0, "Maximum incoming UDP datagram size");
897 udp_abort(struct socket *so)
903 return EINVAL; /* ??? possible? panic instead? */
904 soisdisconnected(so);
912 udp_attach(struct socket *so, int proto, struct pru_attach_info *ai)
921 error = soreserve(so, udp_sendspace, udp_recvspace, ai->sb_rlimit);
925 error = in_pcballoc(so, &udbinfo);
929 so->so_port = udp_soport_attach(so);
931 inp = (struct inpcb *)so->so_pcb;
932 inp->inp_vflag |= INP_IPV4;
933 inp->inp_ip_ttl = ip_defttl;
938 udp_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
940 struct sockaddr_in *sin = (struct sockaddr_in *)nam;
948 error = in_pcbbind(inp, nam, td);
951 if (sin->sin_addr.s_addr != INADDR_ANY)
952 inp->inp_flags |= INP_WASBOUND_NOTANY;
953 in_pcbinswildcardhash(inp);
960 struct netmsg_udp_connect {
961 struct netmsg nm_netmsg;
962 struct socket *nm_so;
963 struct sockaddr_in *nm_sin;
964 struct sockaddr_in *nm_ifsin;
965 struct thread *nm_td;
969 udp_connect_handler(netmsg_t netmsg)
971 struct netmsg_udp_connect *msg = (void *)netmsg;
974 error = udp_connect_oncpu(msg->nm_so, msg->nm_td,
975 msg->nm_sin, msg->nm_ifsin);
976 lwkt_replymsg(&msg->nm_netmsg.nm_lmsg, error);
982 udp_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
985 struct sockaddr_in *sin = (struct sockaddr_in *)nam;
986 struct sockaddr_in *if_sin;
993 if (inp->inp_faddr.s_addr != INADDR_ANY)
1000 if (td->td_proc && td->td_proc->p_ucred->cr_prison != NULL &&
1001 inp->inp_laddr.s_addr == INADDR_ANY) {
1002 error = in_pcbbind(inp, NULL, td);
1008 * Calculate the correct protocol processing thread. The connect
1009 * operation must run there.
1011 error = in_pcbladdr(inp, nam, &if_sin, td);
1014 if (!prison_remote_ip(td, nam))
1015 return(EAFNOSUPPORT); /* IPv6 only jail */
1017 port = udp_addrport(sin->sin_addr.s_addr, sin->sin_port,
1018 inp->inp_laddr.s_addr, inp->inp_lport);
1020 if (port != &curthread->td_msgport) {
1021 struct netmsg_udp_connect msg;
1022 struct route *ro = &inp->inp_route;
1025 * in_pcbladdr() may have allocated a route entry for us
1026 * on the current CPU, but we need a route entry on the
1027 * inpcb's owner CPU, so free it here.
1029 if (ro->ro_rt != NULL)
1031 bzero(ro, sizeof(*ro));
1034 * NOTE: We haven't set so->so_port yet do not pass so
1035 * to netmsg_init() or it will be improperly forwarded.
1037 netmsg_init(&msg.nm_netmsg, NULL, &curthread->td_msgport,
1038 0, udp_connect_handler);
1041 msg.nm_ifsin = if_sin;
1043 error = lwkt_domsg(port, &msg.nm_netmsg.nm_lmsg, 0);
1045 error = udp_connect_oncpu(so, td, sin, if_sin);
1048 error = udp_connect_oncpu(so, td, sin, if_sin);
1054 udp_connect_oncpu(struct socket *so, struct thread *td,
1055 struct sockaddr_in *sin, struct sockaddr_in *if_sin)
1061 if (inp->inp_flags & INP_WILDCARD)
1062 in_pcbremwildcardhash(inp);
1063 error = in_pcbconnect(inp, (struct sockaddr *)sin, td);
1067 * No more errors can occur, finish adjusting the socket
1068 * and change the processing port to reflect the connected
1069 * socket. Once set we can no longer safely mess with the
1073 sosetport(so, &curthread->td_msgport);
1074 } else if (error == EAFNOSUPPORT) { /* connection dissolved */
1076 * Follow traditional BSD behavior and retain
1077 * the local port binding. But, fix the old misbehavior
1078 * of overwriting any previously bound local address.
1080 if (!(inp->inp_flags & INP_WASBOUND_NOTANY))
1081 inp->inp_laddr.s_addr = INADDR_ANY;
1082 in_pcbinswildcardhash(inp);
1088 udp_detach(struct socket *so)
1102 udp_disconnect(struct socket *so)
1110 if (inp->inp_faddr.s_addr == INADDR_ANY)
1114 in_pcbdisconnect(inp);
1116 so->so_state &= ~SS_ISCONNECTED; /* XXX */
1118 ro = &inp->inp_route;
1119 if (ro->ro_rt != NULL)
1121 bzero(ro, sizeof(*ro));
1127 udp_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
1128 struct mbuf *control, struct thread *td)
1137 return udp_output(inp, m, addr, control, td);
1141 udp_shutdown(struct socket *so)
1152 struct pr_usrreqs udp_usrreqs = {
1153 .pru_abort = udp_abort,
1154 .pru_accept = pru_accept_notsupp,
1155 .pru_attach = udp_attach,
1156 .pru_bind = udp_bind,
1157 .pru_connect = udp_connect,
1158 .pru_connect2 = pru_connect2_notsupp,
1159 .pru_control = in_control,
1160 .pru_detach = udp_detach,
1161 .pru_disconnect = udp_disconnect,
1162 .pru_listen = pru_listen_notsupp,
1163 .pru_peeraddr = in_setpeeraddr,
1164 .pru_rcvd = pru_rcvd_notsupp,
1165 .pru_rcvoob = pru_rcvoob_notsupp,
1166 .pru_send = udp_send,
1167 .pru_sense = pru_sense_null,
1168 .pru_shutdown = udp_shutdown,
1169 .pru_sockaddr = in_setsockaddr,
1170 .pru_sosend = sosendudp,
1171 .pru_soreceive = soreceive,
1172 .pru_sopoll = sopoll