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
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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
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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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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>
91 #include <sys/serialize.h>
93 #include <machine/stdarg.h>
96 #include <net/route.h>
97 #include <net/netmsg2.h>
99 #include <netinet/in.h>
100 #include <netinet/in_systm.h>
101 #include <netinet/ip.h>
103 #include <netinet/ip6.h>
105 #include <netinet/in_pcb.h>
106 #include <netinet/in_var.h>
107 #include <netinet/ip_var.h>
109 #include <netinet6/ip6_var.h>
111 #include <netinet/ip_icmp.h>
112 #include <netinet/icmp_var.h>
113 #include <netinet/udp.h>
114 #include <netinet/udp_var.h>
117 #include <netproto/ipsec/ipsec.h>
121 #include <netinet6/ipsec.h>
125 * UDP protocol implementation.
126 * Per RFC 768, August, 1980.
129 static int udpcksum = 1;
131 static int udpcksum = 0; /* XXX */
133 SYSCTL_INT(_net_inet_udp, UDPCTL_CHECKSUM, checksum, CTLFLAG_RW,
134 &udpcksum, 0, "Enable checksumming of UDP packets");
137 SYSCTL_INT(_net_inet_udp, OID_AUTO, log_in_vain, CTLFLAG_RW,
138 &log_in_vain, 0, "Log all incoming UDP packets");
140 static int blackhole = 0;
141 SYSCTL_INT(_net_inet_udp, OID_AUTO, blackhole, CTLFLAG_RW,
142 &blackhole, 0, "Do not send port unreachables for refused connects");
144 static int strict_mcast_mship = 1;
145 SYSCTL_INT(_net_inet_udp, OID_AUTO, strict_mcast_mship, CTLFLAG_RW,
146 &strict_mcast_mship, 0, "Only send multicast to member sockets");
148 struct inpcbinfo udbinfo;
150 static struct netisr_barrier *udbinfo_br;
151 static struct lwkt_serialize udbinfo_slize = LWKT_SERIALIZE_INITIALIZER;
154 #define UDBHASHSIZE 16
157 struct udpstat udpstat; /* from udp_var.h */
158 SYSCTL_STRUCT(_net_inet_udp, UDPCTL_STATS, stats, CTLFLAG_RW,
159 &udpstat, udpstat, "UDP statistics (struct udpstat, netinet/udp_var.h)");
161 static struct sockaddr_in udp_in = { sizeof udp_in, AF_INET };
164 struct sockaddr_in6 uin6_sin;
165 u_char uin6_init_done : 1;
167 { sizeof udp_in6.uin6_sin, AF_INET6 },
171 struct ip6_hdr uip6_ip6;
172 u_char uip6_init_done : 1;
176 static void udp_append (struct inpcb *last, struct ip *ip,
177 struct mbuf *n, int off);
179 static void ip_2_ip6_hdr (struct ip6_hdr *ip6, struct ip *ip);
182 static int udp_connect_oncpu(struct socket *so, struct thread *td,
183 struct sockaddr_in *sin, struct sockaddr_in *if_sin);
184 static int udp_output (struct inpcb *, struct mbuf *, struct sockaddr *,
185 struct mbuf *, struct thread *);
186 static void udbinfo_barrier_set(void);
187 static void udbinfo_barrier_rem(void);
192 in_pcbinfo_init(&udbinfo);
193 udbinfo.hashbase = hashinit(UDBHASHSIZE, M_PCB, &udbinfo.hashmask);
194 udbinfo.porthashbase = hashinit(UDBHASHSIZE, M_PCB,
195 &udbinfo.porthashmask);
196 udbinfo.wildcardhashbase = hashinit(UDBHASHSIZE, M_PCB,
197 &udbinfo.wildcardhashmask);
198 udbinfo.ipi_size = sizeof(struct inpcb);
200 udbinfo_br = netisr_barrier_create();
204 * Check multicast packets to make sure they are only sent to sockets with
205 * multicast memberships for the packet's destination address and arrival
206 * interface. Multicast packets to multicast-unaware sockets are also
209 * Returns 0 if the packet is acceptable, -1 if it is not.
212 check_multicast_membership(struct ip *ip, struct inpcb *inp, struct mbuf *m)
215 struct ip_moptions *mopt;
217 if (strict_mcast_mship == 0 ||
218 !IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
221 mopt = inp->inp_moptions;
224 for (mshipno = 0; mshipno <= mopt->imo_num_memberships; ++mshipno) {
225 struct in_multi *maddr = mopt->imo_membership[mshipno];
227 if (ip->ip_dst.s_addr == maddr->inm_addr.s_addr &&
228 m->m_pkthdr.rcvif == maddr->inm_ifp) {
236 udp_input(struct mbuf **mp, int *offp, int proto)
243 struct mbuf *opts = NULL;
246 struct sockaddr *append_sa;
253 udpstat.udps_ipackets++;
256 * Strip IP options, if any; should skip this,
257 * make available to user, and use on returned packets,
258 * but we don't yet have a way to check the checksum
259 * with options still present.
261 if (iphlen > sizeof(struct ip)) {
263 iphlen = sizeof(struct ip);
267 * IP and UDP headers are together in first mbuf.
268 * Already checked and pulled up in ip_demux().
270 KASSERT(m->m_len >= iphlen + sizeof(struct udphdr),
271 ("UDP header not in one mbuf"));
273 ip = mtod(m, struct ip *);
274 uh = (struct udphdr *)((caddr_t)ip + iphlen);
276 /* destination port of 0 is illegal, based on RFC768. */
277 if (uh->uh_dport == 0)
281 * Make mbuf data length reflect UDP length.
282 * If not enough data to reflect UDP length, drop.
284 len = ntohs((u_short)uh->uh_ulen);
285 if (ip->ip_len != len) {
286 if (len > ip->ip_len || len < sizeof(struct udphdr)) {
287 udpstat.udps_badlen++;
290 m_adj(m, len - ip->ip_len);
291 /* ip->ip_len = len; */
294 * Save a copy of the IP header in case we want restore it
295 * for sending an ICMP error message in response.
300 * Checksum extended UDP header and data.
303 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) {
304 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR)
305 uh->uh_sum = m->m_pkthdr.csum_data;
307 uh->uh_sum = in_pseudo(ip->ip_src.s_addr,
308 ip->ip_dst.s_addr, htonl((u_short)len +
309 m->m_pkthdr.csum_data + IPPROTO_UDP));
310 uh->uh_sum ^= 0xffff;
314 bcopy(((struct ipovly *)ip)->ih_x1, b, 9);
315 bzero(((struct ipovly *)ip)->ih_x1, 9);
316 ((struct ipovly *)ip)->ih_len = uh->uh_ulen;
317 uh->uh_sum = in_cksum(m, len + sizeof(struct ip));
318 bcopy(b, ((struct ipovly *)ip)->ih_x1, 9);
321 udpstat.udps_badsum++;
323 return(IPPROTO_DONE);
326 udpstat.udps_nosum++;
328 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) ||
329 in_broadcast(ip->ip_dst, m->m_pkthdr.rcvif)) {
333 * Deliver a multicast or broadcast datagram to *all* sockets
334 * for which the local and remote addresses and ports match
335 * those of the incoming datagram. This allows more than
336 * one process to receive multi/broadcasts on the same port.
337 * (This really ought to be done for unicast datagrams as
338 * well, but that would cause problems with existing
339 * applications that open both address-specific sockets and
340 * a wildcard socket listening to the same port -- they would
341 * end up receiving duplicates of every unicast datagram.
342 * Those applications open the multiple sockets to overcome an
343 * inadequacy of the UDP socket interface, but for backwards
344 * compatibility we avoid the problem here rather than
345 * fixing the interface. Maybe 4.5BSD will remedy this?)
349 * Construct sockaddr format source address.
351 udp_in.sin_port = uh->uh_sport;
352 udp_in.sin_addr = ip->ip_src;
354 * Locate pcb(s) for datagram.
355 * (Algorithm copied from raw_intr().)
359 udp_in6.uin6_init_done = udp_ip6.uip6_init_done = 0;
361 LIST_FOREACH(inp, &udbinfo.pcblisthead, inp_list) {
362 KKASSERT((inp->inp_flags & INP_PLACEMARKER) == 0);
364 if (!(inp->inp_vflag & INP_IPV4))
367 if (inp->inp_lport != uh->uh_dport)
369 if (inp->inp_laddr.s_addr != INADDR_ANY) {
370 if (inp->inp_laddr.s_addr !=
374 if (inp->inp_faddr.s_addr != INADDR_ANY) {
375 if (inp->inp_faddr.s_addr !=
377 inp->inp_fport != uh->uh_sport)
381 if (check_multicast_membership(ip, inp, m) < 0)
388 /* check AH/ESP integrity. */
389 if (ipsec4_in_reject_so(m, last->inp_socket))
390 ipsecstat.in_polvio++;
391 /* do not inject data to pcb */
395 /* check AH/ESP integrity. */
396 if (ipsec4_in_reject(m, last))
399 #endif /*FAST_IPSEC*/
400 if ((n = m_copypacket(m, MB_DONTWAIT)) != NULL)
401 udp_append(last, ip, n,
403 sizeof(struct udphdr));
407 * Don't look for additional matches if this one does
408 * not have either the SO_REUSEPORT or SO_REUSEADDR
409 * socket options set. This heuristic avoids searching
410 * through all pcbs in the common case of a non-shared
411 * port. It * assumes that an application will never
412 * clear these options after setting them.
414 if (!(last->inp_socket->so_options &
415 (SO_REUSEPORT | SO_REUSEADDR)))
421 * No matching pcb found; discard datagram.
422 * (No need to send an ICMP Port Unreachable
423 * for a broadcast or multicast datgram.)
425 udpstat.udps_noportbcast++;
429 /* check AH/ESP integrity. */
430 if (ipsec4_in_reject_so(m, last->inp_socket)) {
431 ipsecstat.in_polvio++;
436 /* check AH/ESP integrity. */
437 if (ipsec4_in_reject(m, last))
439 #endif /*FAST_IPSEC*/
440 udp_append(last, ip, m, iphlen + sizeof(struct udphdr));
441 return(IPPROTO_DONE);
444 * Locate pcb for datagram.
446 inp = in_pcblookup_hash(&udbinfo, ip->ip_src, uh->uh_sport,
447 ip->ip_dst, uh->uh_dport, 1, m->m_pkthdr.rcvif);
450 char buf[sizeof "aaa.bbb.ccc.ddd"];
452 strcpy(buf, inet_ntoa(ip->ip_dst));
454 "Connection attempt to UDP %s:%d from %s:%d\n",
455 buf, ntohs(uh->uh_dport), inet_ntoa(ip->ip_src),
456 ntohs(uh->uh_sport));
458 udpstat.udps_noport++;
459 if (m->m_flags & (M_BCAST | M_MCAST)) {
460 udpstat.udps_noportbcast++;
466 if (badport_bandlim(BANDLIM_ICMP_UNREACH) < 0)
470 ip->ip_len += iphlen;
471 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
472 return(IPPROTO_DONE);
475 if (ipsec4_in_reject_so(m, inp->inp_socket)) {
476 ipsecstat.in_polvio++;
481 if (ipsec4_in_reject(m, inp))
483 #endif /*FAST_IPSEC*/
485 * Check the minimum TTL for socket.
487 if (ip->ip_ttl < inp->inp_ip_minttl)
491 * Construct sockaddr format source address.
492 * Stuff source address and datagram in user buffer.
494 udp_in.sin_port = uh->uh_sport;
495 udp_in.sin_addr = ip->ip_src;
496 if ((inp->inp_flags & INP_CONTROLOPTS) ||
497 (inp->inp_socket->so_options & SO_TIMESTAMP)) {
499 if (inp->inp_vflag & INP_IPV6) {
502 ip_2_ip6_hdr(&udp_ip6.uip6_ip6, ip);
503 savedflags = inp->inp_flags;
504 inp->inp_flags &= ~INP_UNMAPPABLEOPTS;
505 ip6_savecontrol(inp, &opts, &udp_ip6.uip6_ip6, m);
506 inp->inp_flags = savedflags;
509 ip_savecontrol(inp, &opts, ip, m);
511 m_adj(m, iphlen + sizeof(struct udphdr));
513 if (inp->inp_vflag & INP_IPV6) {
514 in6_sin_2_v4mapsin6(&udp_in, &udp_in6.uin6_sin);
515 append_sa = (struct sockaddr *)&udp_in6;
518 append_sa = (struct sockaddr *)&udp_in;
520 lwkt_gettoken(&inp->inp_socket->so_rcv.ssb_token);
521 if (ssb_appendaddr(&inp->inp_socket->so_rcv, append_sa, m, opts) == 0) {
522 udpstat.udps_fullsock++;
523 lwkt_reltoken(&inp->inp_socket->so_rcv.ssb_token);
526 lwkt_reltoken(&inp->inp_socket->so_rcv.ssb_token);
527 sorwakeup(inp->inp_socket);
528 return(IPPROTO_DONE);
533 return(IPPROTO_DONE);
538 ip_2_ip6_hdr(struct ip6_hdr *ip6, struct ip *ip)
540 bzero(ip6, sizeof *ip6);
542 ip6->ip6_vfc = IPV6_VERSION;
543 ip6->ip6_plen = ip->ip_len;
544 ip6->ip6_nxt = ip->ip_p;
545 ip6->ip6_hlim = ip->ip_ttl;
546 ip6->ip6_src.s6_addr32[2] = ip6->ip6_dst.s6_addr32[2] =
548 ip6->ip6_src.s6_addr32[3] = ip->ip_src.s_addr;
549 ip6->ip6_dst.s6_addr32[3] = ip->ip_dst.s_addr;
554 * subroutine of udp_input(), mainly for source code readability.
555 * caller must properly init udp_ip6 and udp_in6 beforehand.
558 udp_append(struct inpcb *last, struct ip *ip, struct mbuf *n, int off)
560 struct sockaddr *append_sa;
561 struct mbuf *opts = NULL;
563 if (last->inp_flags & INP_CONTROLOPTS ||
564 last->inp_socket->so_options & SO_TIMESTAMP) {
566 if (last->inp_vflag & INP_IPV6) {
569 if (udp_ip6.uip6_init_done == 0) {
570 ip_2_ip6_hdr(&udp_ip6.uip6_ip6, ip);
571 udp_ip6.uip6_init_done = 1;
573 savedflags = last->inp_flags;
574 last->inp_flags &= ~INP_UNMAPPABLEOPTS;
575 ip6_savecontrol(last, &opts, &udp_ip6.uip6_ip6, n);
576 last->inp_flags = savedflags;
579 ip_savecontrol(last, &opts, ip, n);
582 if (last->inp_vflag & INP_IPV6) {
583 if (udp_in6.uin6_init_done == 0) {
584 in6_sin_2_v4mapsin6(&udp_in, &udp_in6.uin6_sin);
585 udp_in6.uin6_init_done = 1;
587 append_sa = (struct sockaddr *)&udp_in6.uin6_sin;
590 append_sa = (struct sockaddr *)&udp_in;
592 lwkt_gettoken(&last->inp_socket->so_rcv.ssb_token);
593 if (ssb_appendaddr(&last->inp_socket->so_rcv, append_sa, n, opts) == 0) {
597 udpstat.udps_fullsock++;
599 sorwakeup(last->inp_socket);
601 lwkt_reltoken(&last->inp_socket->so_rcv.ssb_token);
605 * Notify a udp user of an asynchronous error;
606 * just wake up so that he can collect error status.
609 udp_notify(struct inpcb *inp, int error)
611 inp->inp_socket->so_error = error;
612 sorwakeup(inp->inp_socket);
613 sowwakeup(inp->inp_socket);
616 struct netmsg_udp_notify {
617 struct netmsg_base base;
618 void (*nm_notify)(struct inpcb *, int);
619 struct in_addr nm_faddr;
624 udp_notifyall_oncpu(netmsg_t msg)
626 struct netmsg_udp_notify *nm = (struct netmsg_udp_notify *)msg;
631 in_pcbnotifyall(&udbinfo.pcblisthead, nm->nm_faddr,
632 nm->nm_arg, nm->nm_notify);
633 lwkt_replymsg(&nm->base.lmsg, 0);
636 /* XXX currently udp only runs on cpu 0 */
637 nextcpu = mycpuid + 1;
638 if (nextcpu < ncpus2)
639 lwkt_forwardmsg(cpu_portfn(nextcpu), &nm->base.lmsg);
641 lwkt_replymsg(&nmsg->base.lmsg, 0);
646 udp_rtchange(struct inpcb *inp, int err)
649 /* XXX Nuke this, once UDP inpcbs are CPU localized */
650 if (inp->inp_route.ro_rt && inp->inp_route.ro_rt->rt_cpuid == mycpuid) {
651 rtfree(inp->inp_route.ro_rt);
652 inp->inp_route.ro_rt = NULL;
654 * A new route can be allocated the next time
655 * output is attempted.
659 in_rtchange(inp, err);
664 udp_ctlinput(netmsg_t msg)
666 struct sockaddr *sa = msg->ctlinput.nm_arg;
667 struct ip *ip = msg->ctlinput.nm_extra;
668 int cmd = msg->ctlinput.nm_cmd;
670 void (*notify) (struct inpcb *, int) = udp_notify;
671 struct in_addr faddr;
674 KKASSERT(&curthread->td_msgport == cpu_portfn(0));
676 faddr = ((struct sockaddr_in *)sa)->sin_addr;
677 if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY)
680 if (PRC_IS_REDIRECT(cmd)) {
682 notify = udp_rtchange;
683 } else if (cmd == PRC_HOSTDEAD) {
685 } else if ((unsigned)cmd >= PRC_NCMDS || inetctlerrmap[cmd] == 0) {
690 uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
691 inp = in_pcblookup_hash(&udbinfo, faddr, uh->uh_dport,
692 ip->ip_src, uh->uh_sport, 0, NULL);
693 if (inp != NULL && inp->inp_socket != NULL)
694 (*notify)(inp, inetctlerrmap[cmd]);
695 } else if (PRC_IS_REDIRECT(cmd)) {
696 struct netmsg_udp_notify *nm;
698 KKASSERT(&curthread->td_msgport == cpu_portfn(0));
699 nm = kmalloc(sizeof(*nm), M_LWKTMSG, M_INTWAIT);
700 netmsg_init(&nm->base, NULL, &netisr_afree_rport,
701 0, udp_notifyall_oncpu);
702 nm->nm_faddr = faddr;
703 nm->nm_arg = inetctlerrmap[cmd];
704 nm->nm_notify = notify;
705 lwkt_sendmsg(cpu_portfn(0), &nm->base.lmsg);
708 * XXX We should forward msg upon PRC_HOSTHEAD and ip == NULL,
709 * once UDP inpcbs are CPU localized
711 KKASSERT(&curthread->td_msgport == cpu_portfn(0));
712 in_pcbnotifyall(&udbinfo.pcblisthead, faddr, inetctlerrmap[cmd],
716 lwkt_replymsg(&msg->lmsg, 0);
720 udp_pcblist(SYSCTL_HANDLER_ARGS)
725 error = in_pcblist_global_nomarker(oidp, arg1, arg2, req);
730 SYSCTL_PROC(_net_inet_udp, UDPCTL_PCBLIST, pcblist, CTLFLAG_RD, &udbinfo, 0,
731 udp_pcblist, "S,xinpcb", "List of active UDP sockets");
734 udp_getcred(SYSCTL_HANDLER_ARGS)
736 struct sockaddr_in addrs[2];
740 error = priv_check(req->td, PRIV_ROOT);
743 error = SYSCTL_IN(req, addrs, sizeof addrs);
748 inp = in_pcblookup_hash(&udbinfo, addrs[1].sin_addr, addrs[1].sin_port,
749 addrs[0].sin_addr, addrs[0].sin_port, 1, NULL);
750 if (inp == NULL || inp->inp_socket == NULL) {
754 error = SYSCTL_OUT(req, inp->inp_socket->so_cred, sizeof(struct ucred));
760 SYSCTL_PROC(_net_inet_udp, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW,
761 0, 0, udp_getcred, "S,ucred", "Get the ucred of a UDP connection");
764 udp_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *dstaddr,
765 struct mbuf *control, struct thread *td)
768 int len = m->m_pkthdr.len;
769 struct sockaddr_in *sin; /* really is initialized before use */
770 int error = 0, lport_any = 0;
772 if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) {
777 if (inp->inp_lport == 0) { /* unbound socket */
778 error = in_pcbbind(inp, NULL, td);
782 udbinfo_barrier_set();
783 in_pcbinswildcardhash(inp);
784 udbinfo_barrier_rem();
788 if (dstaddr != NULL) { /* destination address specified */
789 if (inp->inp_faddr.s_addr != INADDR_ANY) {
790 /* already connected */
794 sin = (struct sockaddr_in *)dstaddr;
795 if (!prison_remote_ip(td, (struct sockaddr *)&sin)) {
796 error = EAFNOSUPPORT; /* IPv6 only jail */
800 if (inp->inp_faddr.s_addr == INADDR_ANY) {
801 /* no destination specified and not already connected */
809 * Calculate data length and get a mbuf
810 * for UDP and IP headers.
812 M_PREPEND(m, sizeof(struct udpiphdr), MB_DONTWAIT);
819 * Fill in mbuf with extended UDP header
820 * and addresses and length put into network format.
822 ui = mtod(m, struct udpiphdr *);
823 bzero(ui->ui_x1, sizeof ui->ui_x1); /* XXX still needed? */
824 ui->ui_pr = IPPROTO_UDP;
827 * Set destination address.
829 if (dstaddr != NULL) { /* use specified destination */
830 ui->ui_dst = sin->sin_addr;
831 ui->ui_dport = sin->sin_port;
832 } else { /* use connected destination */
833 ui->ui_dst = inp->inp_faddr;
834 ui->ui_dport = inp->inp_fport;
838 * Set source address.
840 if (inp->inp_laddr.s_addr == INADDR_ANY) {
841 struct sockaddr_in *if_sin;
843 if (dstaddr == NULL) {
845 * connect() had (or should have) failed because
846 * the interface had no IP address, but the
847 * application proceeded to call send() anyways.
853 /* Look up outgoing interface. */
854 if ((error = in_pcbladdr(inp, dstaddr, &if_sin, td)))
856 ui->ui_src = if_sin->sin_addr; /* use address of interface */
858 ui->ui_src = inp->inp_laddr; /* use non-null bound address */
860 ui->ui_sport = inp->inp_lport;
861 KASSERT(inp->inp_lport != 0, ("inp lport should have been bound"));
863 ui->ui_ulen = htons((u_short)len + sizeof(struct udphdr));
866 * Set up checksum and output datagram.
869 ui->ui_sum = in_pseudo(ui->ui_src.s_addr, ui->ui_dst.s_addr,
870 htons((u_short)len + sizeof(struct udphdr) + IPPROTO_UDP));
871 m->m_pkthdr.csum_flags = CSUM_UDP;
872 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
876 ((struct ip *)ui)->ip_len = sizeof(struct udpiphdr) + len;
877 ((struct ip *)ui)->ip_ttl = inp->inp_ip_ttl; /* XXX */
878 ((struct ip *)ui)->ip_tos = inp->inp_ip_tos; /* XXX */
879 udpstat.udps_opackets++;
881 error = ip_output(m, inp->inp_options, &inp->inp_route,
882 (inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST)) |
884 inp->inp_moptions, inp);
887 * If this is the first data gram sent on an unbound and unconnected
888 * UDP socket, lport will be changed in this function. If target
889 * CPU after this lport changing is no longer the current CPU, then
890 * free the route entry allocated on the current CPU.
893 if (udp_addrcpu(inp->inp_faddr.s_addr, inp->inp_fport,
894 inp->inp_laddr.s_addr, inp->inp_lport) != mycpuid) {
896 struct route *ro = &inp->inp_route;
898 if (ro->ro_rt != NULL)
900 bzero(ro, sizeof(*ro));
902 panic("UDP activity should only be in netisr0");
913 u_long udp_sendspace = 9216; /* really max datagram size */
914 /* 40 1K datagrams */
915 SYSCTL_INT(_net_inet_udp, UDPCTL_MAXDGRAM, maxdgram, CTLFLAG_RW,
916 &udp_sendspace, 0, "Maximum outgoing UDP datagram size");
918 u_long udp_recvspace = 40 * (1024 +
920 sizeof(struct sockaddr_in6)
922 sizeof(struct sockaddr_in)
925 SYSCTL_INT(_net_inet_udp, UDPCTL_RECVSPACE, recvspace, CTLFLAG_RW,
926 &udp_recvspace, 0, "Maximum incoming UDP datagram size");
929 * NOTE: (so) is referenced from soabort*() and netmsg_pru_abort()
930 * will sofree() it when we return.
933 udp_abort(netmsg_t msg)
935 struct socket *so = msg->abort.base.nm_so;
939 KKASSERT(&curthread->td_msgport == cpu_portfn(0));
943 soisdisconnected(so);
945 udbinfo_barrier_set();
947 udbinfo_barrier_rem();
952 lwkt_replymsg(&msg->abort.base.lmsg, error);
956 udp_attach(netmsg_t msg)
958 struct socket *so = msg->attach.base.nm_so;
959 struct pru_attach_info *ai = msg->attach.nm_ai;
963 KKASSERT(&curthread->td_msgport == cpu_portfn(0));
970 error = soreserve(so, udp_sendspace, udp_recvspace, ai->sb_rlimit);
974 udbinfo_barrier_set();
975 error = in_pcballoc(so, &udbinfo);
976 udbinfo_barrier_rem();
982 * Set default port for protocol processing prior to bind/connect.
984 sosetport(so, cpu_portfn(0));
986 inp = (struct inpcb *)so->so_pcb;
987 inp->inp_vflag |= INP_IPV4;
988 inp->inp_ip_ttl = ip_defttl;
991 lwkt_replymsg(&msg->attach.base.lmsg, error);
995 udp_bind(netmsg_t msg)
997 struct socket *so = msg->bind.base.nm_so;
998 struct sockaddr *nam = msg->bind.nm_nam;
999 struct thread *td = msg->bind.nm_td;
1000 struct sockaddr_in *sin = (struct sockaddr_in *)nam;
1006 error = in_pcbbind(inp, nam, td);
1008 if (sin->sin_addr.s_addr != INADDR_ANY)
1009 inp->inp_flags |= INP_WASBOUND_NOTANY;
1011 udbinfo_barrier_set();
1012 in_pcbinswildcardhash(inp);
1013 udbinfo_barrier_rem();
1018 lwkt_replymsg(&msg->bind.base.lmsg, error);
1022 udp_connect(netmsg_t msg)
1024 struct socket *so = msg->connect.base.nm_so;
1025 struct sockaddr *nam = msg->connect.nm_nam;
1026 struct thread *td = msg->connect.nm_td;
1028 struct sockaddr_in *sin = (struct sockaddr_in *)nam;
1029 struct sockaddr_in *if_sin;
1033 KKASSERT(&curthread->td_msgport == cpu_portfn(0));
1041 if (msg->connect.nm_reconnect & NMSG_RECONNECT_RECONNECT) {
1042 panic("UDP does not support RECONNECT\n");
1044 msg->connect.nm_reconnect &= ~NMSG_RECONNECT_RECONNECT;
1045 in_pcblink(inp, &udbinfo);
1049 if (inp->inp_faddr.s_addr != INADDR_ANY) {
1056 * Bind if we have to
1058 if (td->td_proc && td->td_proc->p_ucred->cr_prison != NULL &&
1059 inp->inp_laddr.s_addr == INADDR_ANY) {
1060 error = in_pcbbind(inp, NULL, td);
1066 * Calculate the correct protocol processing thread. The connect
1067 * operation must run there.
1069 error = in_pcbladdr(inp, nam, &if_sin, td);
1072 if (!prison_remote_ip(td, nam)) {
1073 error = EAFNOSUPPORT; /* IPv6 only jail */
1077 port = udp_addrport(sin->sin_addr.s_addr, sin->sin_port,
1078 inp->inp_laddr.s_addr, inp->inp_lport);
1080 if (port != &curthread->td_msgport) {
1082 struct route *ro = &inp->inp_route;
1085 * in_pcbladdr() may have allocated a route entry for us
1086 * on the current CPU, but we need a route entry on the
1087 * inpcb's owner CPU, so free it here.
1089 if (ro->ro_rt != NULL)
1091 bzero(ro, sizeof(*ro));
1094 * We are moving the protocol processing port the socket
1095 * is on, we have to unlink here and re-link on the
1098 in_pcbunlink(so->so_pcb, &udbinfo);
1099 /* in_pcbunlink(so->so_pcb, &udbinfo[mycpu->gd_cpuid]); */
1100 sosetport(so, port);
1101 msg->connect.nm_reconnect |= NMSG_RECONNECT_RECONNECT;
1102 msg->connect.base.nm_dispatch = udp_connect;
1104 lwkt_forwardmsg(port, &msg->connect.base.lmsg);
1105 /* msg invalid now */
1108 panic("UDP activity should only be in netisr0");
1112 KKASSERT(port == &curthread->td_msgport);
1113 error = udp_connect_oncpu(so, td, sin, if_sin);
1115 KKASSERT(msg->connect.nm_m == NULL);
1116 lwkt_replymsg(&msg->connect.base.lmsg, error);
1120 udp_connect_oncpu(struct socket *so, struct thread *td,
1121 struct sockaddr_in *sin, struct sockaddr_in *if_sin)
1126 udbinfo_barrier_set();
1129 if (inp->inp_flags & INP_WILDCARD)
1130 in_pcbremwildcardhash(inp);
1131 error = in_pcbconnect(inp, (struct sockaddr *)sin, td);
1135 * No more errors can occur, finish adjusting the socket
1136 * and change the processing port to reflect the connected
1137 * socket. Once set we can no longer safely mess with the
1141 } else if (error == EAFNOSUPPORT) { /* connection dissolved */
1143 * Follow traditional BSD behavior and retain
1144 * the local port binding. But, fix the old misbehavior
1145 * of overwriting any previously bound local address.
1147 if (!(inp->inp_flags & INP_WASBOUND_NOTANY))
1148 inp->inp_laddr.s_addr = INADDR_ANY;
1149 in_pcbinswildcardhash(inp);
1152 udbinfo_barrier_rem();
1157 udp_detach(netmsg_t msg)
1159 struct socket *so = msg->detach.base.nm_so;
1163 KKASSERT(&curthread->td_msgport == cpu_portfn(0));
1167 udbinfo_barrier_set();
1169 udbinfo_barrier_rem();
1174 lwkt_replymsg(&msg->detach.base.lmsg, error);
1178 udp_disconnect(netmsg_t msg)
1180 struct socket *so = msg->disconnect.base.nm_so;
1185 KKASSERT(&curthread->td_msgport == cpu_portfn(0));
1192 if (inp->inp_faddr.s_addr == INADDR_ANY) {
1199 udbinfo_barrier_set();
1200 in_pcbdisconnect(inp);
1201 udbinfo_barrier_rem();
1203 soclrstate(so, SS_ISCONNECTED); /* XXX */
1206 ro = &inp->inp_route;
1207 if (ro->ro_rt != NULL)
1209 bzero(ro, sizeof(*ro));
1212 lwkt_replymsg(&msg->disconnect.base.lmsg, error);
1216 udp_send(netmsg_t msg)
1218 struct socket *so = msg->send.base.nm_so;
1222 KKASSERT(&curthread->td_msgport == cpu_portfn(0));
1226 error = udp_output(inp,
1229 msg->send.nm_control,
1232 m_freem(msg->send.nm_m);
1235 msg->send.nm_m = NULL;
1236 lwkt_replymsg(&msg->send.base.lmsg, error);
1240 udp_shutdown(netmsg_t msg)
1242 struct socket *so = msg->shutdown.base.nm_so;
1246 KKASSERT(&curthread->td_msgport == cpu_portfn(0));
1255 lwkt_replymsg(&msg->shutdown.base.lmsg, error);
1261 lwkt_serialize_enter(&udbinfo_slize);
1265 udbinfo_unlock(void)
1267 lwkt_serialize_exit(&udbinfo_slize);
1271 udbinfo_barrier_set(void)
1273 netisr_barrier_set(udbinfo_br);
1278 udbinfo_barrier_rem(void)
1281 netisr_barrier_rem(udbinfo_br);
1284 struct pr_usrreqs udp_usrreqs = {
1285 .pru_abort = udp_abort,
1286 .pru_accept = pr_generic_notsupp,
1287 .pru_attach = udp_attach,
1288 .pru_bind = udp_bind,
1289 .pru_connect = udp_connect,
1290 .pru_connect2 = pr_generic_notsupp,
1291 .pru_control = in_control_dispatch,
1292 .pru_detach = udp_detach,
1293 .pru_disconnect = udp_disconnect,
1294 .pru_listen = pr_generic_notsupp,
1295 .pru_peeraddr = in_setpeeraddr_dispatch,
1296 .pru_rcvd = pr_generic_notsupp,
1297 .pru_rcvoob = pr_generic_notsupp,
1298 .pru_send = udp_send,
1299 .pru_sense = pru_sense_null,
1300 .pru_shutdown = udp_shutdown,
1301 .pru_sockaddr = in_setsockaddr_dispatch,
1302 .pru_sosend = sosendudp,
1303 .pru_soreceive = soreceive