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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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
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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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56 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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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 int udp_sosnd_async = 1;
149 SYSCTL_INT(_net_inet_udp, OID_AUTO, sosnd_async, CTLFLAG_RW,
150 &udp_sosnd_async, 0, "UDP asynchronized pru_send");
152 struct inpcbinfo udbinfo;
154 static struct netisr_barrier *udbinfo_br;
155 static struct lwkt_serialize udbinfo_slize = LWKT_SERIALIZE_INITIALIZER;
158 #define UDBHASHSIZE 16
161 struct udpstat udpstat; /* from udp_var.h */
162 SYSCTL_STRUCT(_net_inet_udp, UDPCTL_STATS, stats, CTLFLAG_RW,
163 &udpstat, udpstat, "UDP statistics (struct udpstat, netinet/udp_var.h)");
165 static struct sockaddr_in udp_in = { sizeof udp_in, AF_INET };
168 struct sockaddr_in6 uin6_sin;
169 u_char uin6_init_done : 1;
171 { sizeof udp_in6.uin6_sin, AF_INET6 },
175 struct ip6_hdr uip6_ip6;
176 u_char uip6_init_done : 1;
180 static void udp_append (struct inpcb *last, struct ip *ip,
181 struct mbuf *n, int off);
183 static void ip_2_ip6_hdr (struct ip6_hdr *ip6, struct ip *ip);
186 static int udp_connect_oncpu(struct socket *so, struct thread *td,
187 struct sockaddr_in *sin, struct sockaddr_in *if_sin);
188 static int udp_output (struct inpcb *, struct mbuf *, struct sockaddr *,
189 struct thread *, int);
194 in_pcbinfo_init(&udbinfo);
195 udbinfo.hashbase = hashinit(UDBHASHSIZE, M_PCB, &udbinfo.hashmask);
196 udbinfo.porthashbase = hashinit(UDBHASHSIZE, M_PCB,
197 &udbinfo.porthashmask);
198 udbinfo.wildcardhashbase = hashinit(UDBHASHSIZE, M_PCB,
199 &udbinfo.wildcardhashmask);
200 udbinfo.ipi_size = sizeof(struct inpcb);
202 udbinfo_br = netisr_barrier_create();
206 * Check multicast packets to make sure they are only sent to sockets with
207 * multicast memberships for the packet's destination address and arrival
208 * interface. Multicast packets to multicast-unaware sockets are also
211 * Returns 0 if the packet is acceptable, -1 if it is not.
214 check_multicast_membership(struct ip *ip, struct inpcb *inp, struct mbuf *m)
217 struct ip_moptions *mopt;
219 if (strict_mcast_mship == 0 ||
220 !IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
223 mopt = inp->inp_moptions;
226 for (mshipno = 0; mshipno < mopt->imo_num_memberships; ++mshipno) {
227 struct in_multi *maddr = mopt->imo_membership[mshipno];
229 if (ip->ip_dst.s_addr == maddr->inm_addr.s_addr &&
230 m->m_pkthdr.rcvif == maddr->inm_ifp) {
238 udp_input(struct mbuf **mp, int *offp, int proto)
245 struct mbuf *opts = NULL;
248 struct sockaddr *append_sa;
255 udpstat.udps_ipackets++;
258 * Strip IP options, if any; should skip this,
259 * make available to user, and use on returned packets,
260 * but we don't yet have a way to check the checksum
261 * with options still present.
263 if (iphlen > sizeof(struct ip)) {
265 iphlen = sizeof(struct ip);
269 * IP and UDP headers are together in first mbuf.
270 * Already checked and pulled up in ip_demux().
272 KASSERT(m->m_len >= iphlen + sizeof(struct udphdr),
273 ("UDP header not in one mbuf"));
275 ip = mtod(m, struct ip *);
276 uh = (struct udphdr *)((caddr_t)ip + iphlen);
278 /* destination port of 0 is illegal, based on RFC768. */
279 if (uh->uh_dport == 0)
283 * Make mbuf data length reflect UDP length.
284 * If not enough data to reflect UDP length, drop.
286 len = ntohs((u_short)uh->uh_ulen);
287 if (ip->ip_len != len) {
288 if (len > ip->ip_len || len < sizeof(struct udphdr)) {
289 udpstat.udps_badlen++;
292 m_adj(m, len - ip->ip_len);
293 /* ip->ip_len = len; */
296 * Save a copy of the IP header in case we want restore it
297 * for sending an ICMP error message in response.
302 * Checksum extended UDP header and data.
305 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) {
306 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR)
307 uh->uh_sum = m->m_pkthdr.csum_data;
309 uh->uh_sum = in_pseudo(ip->ip_src.s_addr,
310 ip->ip_dst.s_addr, htonl((u_short)len +
311 m->m_pkthdr.csum_data + IPPROTO_UDP));
312 uh->uh_sum ^= 0xffff;
316 bcopy(((struct ipovly *)ip)->ih_x1, b, 9);
317 bzero(((struct ipovly *)ip)->ih_x1, 9);
318 ((struct ipovly *)ip)->ih_len = uh->uh_ulen;
319 uh->uh_sum = in_cksum(m, len + sizeof(struct ip));
320 bcopy(b, ((struct ipovly *)ip)->ih_x1, 9);
323 udpstat.udps_badsum++;
325 return(IPPROTO_DONE);
328 udpstat.udps_nosum++;
330 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) ||
331 in_broadcast(ip->ip_dst, m->m_pkthdr.rcvif)) {
335 * Deliver a multicast or broadcast datagram to *all* sockets
336 * for which the local and remote addresses and ports match
337 * those of the incoming datagram. This allows more than
338 * one process to receive multi/broadcasts on the same port.
339 * (This really ought to be done for unicast datagrams as
340 * well, but that would cause problems with existing
341 * applications that open both address-specific sockets and
342 * a wildcard socket listening to the same port -- they would
343 * end up receiving duplicates of every unicast datagram.
344 * Those applications open the multiple sockets to overcome an
345 * inadequacy of the UDP socket interface, but for backwards
346 * compatibility we avoid the problem here rather than
347 * fixing the interface. Maybe 4.5BSD will remedy this?)
351 * Construct sockaddr format source address.
353 udp_in.sin_port = uh->uh_sport;
354 udp_in.sin_addr = ip->ip_src;
356 * Locate pcb(s) for datagram.
357 * (Algorithm copied from raw_intr().)
361 udp_in6.uin6_init_done = udp_ip6.uip6_init_done = 0;
363 LIST_FOREACH(inp, &udbinfo.pcblisthead, inp_list) {
364 KKASSERT((inp->inp_flags & INP_PLACEMARKER) == 0);
366 if (!(inp->inp_vflag & INP_IPV4))
369 if (inp->inp_lport != uh->uh_dport)
371 if (inp->inp_laddr.s_addr != INADDR_ANY) {
372 if (inp->inp_laddr.s_addr !=
376 if (inp->inp_faddr.s_addr != INADDR_ANY) {
377 if (inp->inp_faddr.s_addr !=
379 inp->inp_fport != uh->uh_sport)
383 if (check_multicast_membership(ip, inp, m) < 0)
390 /* check AH/ESP integrity. */
391 if (ipsec4_in_reject_so(m, last->inp_socket))
392 ipsecstat.in_polvio++;
393 /* do not inject data to pcb */
397 /* check AH/ESP integrity. */
398 if (ipsec4_in_reject(m, last))
401 #endif /*FAST_IPSEC*/
402 if ((n = m_copypacket(m, MB_DONTWAIT)) != NULL)
403 udp_append(last, ip, n,
405 sizeof(struct udphdr));
409 * Don't look for additional matches if this one does
410 * not have either the SO_REUSEPORT or SO_REUSEADDR
411 * socket options set. This heuristic avoids searching
412 * through all pcbs in the common case of a non-shared
413 * port. It * assumes that an application will never
414 * clear these options after setting them.
416 if (!(last->inp_socket->so_options &
417 (SO_REUSEPORT | SO_REUSEADDR)))
423 * No matching pcb found; discard datagram.
424 * (No need to send an ICMP Port Unreachable
425 * for a broadcast or multicast datgram.)
427 udpstat.udps_noportbcast++;
431 /* check AH/ESP integrity. */
432 if (ipsec4_in_reject_so(m, last->inp_socket)) {
433 ipsecstat.in_polvio++;
438 /* check AH/ESP integrity. */
439 if (ipsec4_in_reject(m, last))
441 #endif /*FAST_IPSEC*/
442 udp_append(last, ip, m, iphlen + sizeof(struct udphdr));
443 return(IPPROTO_DONE);
446 * Locate pcb for datagram.
448 inp = in_pcblookup_hash(&udbinfo, ip->ip_src, uh->uh_sport,
449 ip->ip_dst, uh->uh_dport, 1, m->m_pkthdr.rcvif);
452 char buf[sizeof "aaa.bbb.ccc.ddd"];
454 strcpy(buf, inet_ntoa(ip->ip_dst));
456 "Connection attempt to UDP %s:%d from %s:%d\n",
457 buf, ntohs(uh->uh_dport), inet_ntoa(ip->ip_src),
458 ntohs(uh->uh_sport));
460 udpstat.udps_noport++;
461 if (m->m_flags & (M_BCAST | M_MCAST)) {
462 udpstat.udps_noportbcast++;
468 if (badport_bandlim(BANDLIM_ICMP_UNREACH) < 0)
472 ip->ip_len += iphlen;
473 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
474 return(IPPROTO_DONE);
477 if (ipsec4_in_reject_so(m, inp->inp_socket)) {
478 ipsecstat.in_polvio++;
483 if (ipsec4_in_reject(m, inp))
485 #endif /*FAST_IPSEC*/
487 * Check the minimum TTL for socket.
489 if (ip->ip_ttl < inp->inp_ip_minttl)
493 * Construct sockaddr format source address.
494 * Stuff source address and datagram in user buffer.
496 udp_in.sin_port = uh->uh_sport;
497 udp_in.sin_addr = ip->ip_src;
498 if ((inp->inp_flags & INP_CONTROLOPTS) ||
499 (inp->inp_socket->so_options & SO_TIMESTAMP)) {
501 if (inp->inp_vflag & INP_IPV6) {
504 ip_2_ip6_hdr(&udp_ip6.uip6_ip6, ip);
505 savedflags = inp->inp_flags;
506 inp->inp_flags &= ~INP_UNMAPPABLEOPTS;
507 ip6_savecontrol(inp, &opts, &udp_ip6.uip6_ip6, m);
508 inp->inp_flags = savedflags;
511 ip_savecontrol(inp, &opts, ip, m);
513 m_adj(m, iphlen + sizeof(struct udphdr));
515 if (inp->inp_vflag & INP_IPV6) {
516 in6_sin_2_v4mapsin6(&udp_in, &udp_in6.uin6_sin);
517 append_sa = (struct sockaddr *)&udp_in6;
520 append_sa = (struct sockaddr *)&udp_in;
522 lwkt_gettoken(&inp->inp_socket->so_rcv.ssb_token);
523 if (ssb_appendaddr(&inp->inp_socket->so_rcv, append_sa, m, opts) == 0) {
524 udpstat.udps_fullsock++;
525 lwkt_reltoken(&inp->inp_socket->so_rcv.ssb_token);
528 lwkt_reltoken(&inp->inp_socket->so_rcv.ssb_token);
529 sorwakeup(inp->inp_socket);
530 return(IPPROTO_DONE);
535 return(IPPROTO_DONE);
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 lwkt_gettoken(&last->inp_socket->so_rcv.ssb_token);
595 if (ssb_appendaddr(&last->inp_socket->so_rcv, append_sa, n, opts) == 0) {
599 udpstat.udps_fullsock++;
601 sorwakeup(last->inp_socket);
603 lwkt_reltoken(&last->inp_socket->so_rcv.ssb_token);
607 * Notify a udp user of an asynchronous error;
608 * just wake up so that he can collect error status.
611 udp_notify(struct inpcb *inp, int error)
613 inp->inp_socket->so_error = error;
614 sorwakeup(inp->inp_socket);
615 sowwakeup(inp->inp_socket);
618 struct netmsg_udp_notify {
619 struct netmsg_base base;
620 void (*nm_notify)(struct inpcb *, int);
621 struct in_addr nm_faddr;
626 udp_notifyall_oncpu(netmsg_t msg)
628 struct netmsg_udp_notify *nm = (struct netmsg_udp_notify *)msg;
633 in_pcbnotifyall(&udbinfo.pcblisthead, nm->nm_faddr,
634 nm->nm_arg, nm->nm_notify);
635 lwkt_replymsg(&nm->base.lmsg, 0);
638 /* XXX currently udp only runs on cpu 0 */
639 nextcpu = mycpuid + 1;
640 if (nextcpu < ncpus2)
641 lwkt_forwardmsg(cpu_portfn(nextcpu), &nm->base.lmsg);
643 lwkt_replymsg(&nmsg->base.lmsg, 0);
648 udp_rtchange(struct inpcb *inp, int err)
651 /* XXX Nuke this, once UDP inpcbs are CPU localized */
652 if (inp->inp_route.ro_rt && inp->inp_route.ro_rt->rt_cpuid == mycpuid) {
653 rtfree(inp->inp_route.ro_rt);
654 inp->inp_route.ro_rt = NULL;
656 * A new route can be allocated the next time
657 * output is attempted.
661 in_rtchange(inp, err);
666 udp_ctlinput(netmsg_t msg)
668 struct sockaddr *sa = msg->ctlinput.nm_arg;
669 struct ip *ip = msg->ctlinput.nm_extra;
670 int cmd = msg->ctlinput.nm_cmd;
672 void (*notify) (struct inpcb *, int) = udp_notify;
673 struct in_addr faddr;
676 KKASSERT(&curthread->td_msgport == cpu_portfn(0));
678 faddr = ((struct sockaddr_in *)sa)->sin_addr;
679 if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY)
682 if (PRC_IS_REDIRECT(cmd)) {
684 notify = udp_rtchange;
685 } else if (cmd == PRC_HOSTDEAD) {
687 } else if ((unsigned)cmd >= PRC_NCMDS || inetctlerrmap[cmd] == 0) {
692 uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
693 inp = in_pcblookup_hash(&udbinfo, faddr, uh->uh_dport,
694 ip->ip_src, uh->uh_sport, 0, NULL);
695 if (inp != NULL && inp->inp_socket != NULL)
696 (*notify)(inp, inetctlerrmap[cmd]);
697 } else if (PRC_IS_REDIRECT(cmd)) {
698 struct netmsg_udp_notify *nm;
700 KKASSERT(&curthread->td_msgport == cpu_portfn(0));
701 nm = kmalloc(sizeof(*nm), M_LWKTMSG, M_INTWAIT);
702 netmsg_init(&nm->base, NULL, &netisr_afree_rport,
703 0, udp_notifyall_oncpu);
704 nm->nm_faddr = faddr;
705 nm->nm_arg = inetctlerrmap[cmd];
706 nm->nm_notify = notify;
707 lwkt_sendmsg(cpu_portfn(0), &nm->base.lmsg);
710 * XXX We should forward msg upon PRC_HOSTHEAD and ip == NULL,
711 * once UDP inpcbs are CPU localized
713 KKASSERT(&curthread->td_msgport == cpu_portfn(0));
714 in_pcbnotifyall(&udbinfo.pcblisthead, faddr, inetctlerrmap[cmd],
718 lwkt_replymsg(&msg->lmsg, 0);
722 udp_pcblist(SYSCTL_HANDLER_ARGS)
728 error = in_pcblist_global_nomarker(oidp, arg1, arg2, req, &xi, &nxi);
732 KKASSERT(xi == NULL);
736 KKASSERT(xi == NULL);
740 for (i = 0; i < nxi; ++i) {
741 error = SYSCTL_OUT(req, &xi[i], sizeof(xi[i]));
749 SYSCTL_PROC(_net_inet_udp, UDPCTL_PCBLIST, pcblist, CTLFLAG_RD, &udbinfo, 0,
750 udp_pcblist, "S,xinpcb", "List of active UDP sockets");
753 udp_getcred(SYSCTL_HANDLER_ARGS)
755 struct sockaddr_in addrs[2];
756 struct ucred cred0, *cred = NULL;
760 error = priv_check(req->td, PRIV_ROOT);
763 error = SYSCTL_IN(req, addrs, sizeof addrs);
768 inp = in_pcblookup_hash(&udbinfo, addrs[1].sin_addr, addrs[1].sin_port,
769 addrs[0].sin_addr, addrs[0].sin_port, 1, NULL);
770 if (inp == NULL || inp->inp_socket == NULL) {
773 if (inp->inp_socket->so_cred != NULL) {
774 cred0 = *(inp->inp_socket->so_cred);
783 return SYSCTL_OUT(req, cred, sizeof(struct ucred));
786 SYSCTL_PROC(_net_inet_udp, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW,
787 0, 0, udp_getcred, "S,ucred", "Get the ucred of a UDP connection");
790 udp_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *dstaddr,
791 struct thread *td, int flags)
794 int len = m->m_pkthdr.len;
795 struct sockaddr_in *sin; /* really is initialized before use */
796 int error = 0, lport_any = 0;
798 if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) {
803 if (inp->inp_lport == 0) { /* unbound socket */
804 error = in_pcbbind(inp, NULL, td);
808 udbinfo_barrier_set();
809 in_pcbinswildcardhash(inp);
810 udbinfo_barrier_rem();
814 if (dstaddr != NULL) { /* destination address specified */
815 if (inp->inp_faddr.s_addr != INADDR_ANY) {
816 /* already connected */
820 sin = (struct sockaddr_in *)dstaddr;
821 if (!prison_remote_ip(td, (struct sockaddr *)&sin)) {
822 error = EAFNOSUPPORT; /* IPv6 only jail */
826 if (inp->inp_faddr.s_addr == INADDR_ANY) {
827 /* no destination specified and not already connected */
835 * Calculate data length and get a mbuf
836 * for UDP and IP headers.
838 M_PREPEND(m, sizeof(struct udpiphdr), MB_DONTWAIT);
845 * Fill in mbuf with extended UDP header
846 * and addresses and length put into network format.
848 ui = mtod(m, struct udpiphdr *);
849 bzero(ui->ui_x1, sizeof ui->ui_x1); /* XXX still needed? */
850 ui->ui_pr = IPPROTO_UDP;
853 * Set destination address.
855 if (dstaddr != NULL) { /* use specified destination */
856 ui->ui_dst = sin->sin_addr;
857 ui->ui_dport = sin->sin_port;
858 } else { /* use connected destination */
859 ui->ui_dst = inp->inp_faddr;
860 ui->ui_dport = inp->inp_fport;
864 * Set source address.
866 if (inp->inp_laddr.s_addr == INADDR_ANY) {
867 struct sockaddr_in *if_sin;
869 if (dstaddr == NULL) {
871 * connect() had (or should have) failed because
872 * the interface had no IP address, but the
873 * application proceeded to call send() anyways.
879 /* Look up outgoing interface. */
880 if ((error = in_pcbladdr(inp, dstaddr, &if_sin, td)))
882 ui->ui_src = if_sin->sin_addr; /* use address of interface */
884 ui->ui_src = inp->inp_laddr; /* use non-null bound address */
886 ui->ui_sport = inp->inp_lport;
887 KASSERT(inp->inp_lport != 0, ("inp lport should have been bound"));
889 ui->ui_ulen = htons((u_short)len + sizeof(struct udphdr));
892 * Set up checksum and output datagram.
895 ui->ui_sum = in_pseudo(ui->ui_src.s_addr, ui->ui_dst.s_addr,
896 htons((u_short)len + sizeof(struct udphdr) + IPPROTO_UDP));
897 m->m_pkthdr.csum_flags = CSUM_UDP;
898 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
902 ((struct ip *)ui)->ip_len = sizeof(struct udpiphdr) + len;
903 ((struct ip *)ui)->ip_ttl = inp->inp_ip_ttl; /* XXX */
904 ((struct ip *)ui)->ip_tos = inp->inp_ip_tos; /* XXX */
905 udpstat.udps_opackets++;
907 error = ip_output(m, inp->inp_options, &inp->inp_route,
908 (inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST)) |
909 flags | IP_DEBUGROUTE,
910 inp->inp_moptions, inp);
913 * If this is the first data gram sent on an unbound and unconnected
914 * UDP socket, lport will be changed in this function. If target
915 * CPU after this lport changing is no longer the current CPU, then
916 * free the route entry allocated on the current CPU.
919 if (udp_addrcpu(inp->inp_faddr.s_addr, inp->inp_fport,
920 inp->inp_laddr.s_addr, inp->inp_lport) != mycpuid) {
922 struct route *ro = &inp->inp_route;
924 if (ro->ro_rt != NULL)
926 bzero(ro, sizeof(*ro));
928 panic("UDP activity should only be in netisr0");
939 u_long udp_sendspace = 9216; /* really max datagram size */
940 /* 40 1K datagrams */
941 SYSCTL_INT(_net_inet_udp, UDPCTL_MAXDGRAM, maxdgram, CTLFLAG_RW,
942 &udp_sendspace, 0, "Maximum outgoing UDP datagram size");
944 u_long udp_recvspace = 40 * (1024 +
946 sizeof(struct sockaddr_in6)
948 sizeof(struct sockaddr_in)
951 SYSCTL_INT(_net_inet_udp, UDPCTL_RECVSPACE, recvspace, CTLFLAG_RW,
952 &udp_recvspace, 0, "Maximum incoming UDP datagram size");
955 * NOTE: (so) is referenced from soabort*() and netmsg_pru_abort()
956 * will sofree() it when we return.
959 udp_abort(netmsg_t msg)
961 struct socket *so = msg->abort.base.nm_so;
965 KKASSERT(&curthread->td_msgport == cpu_portfn(0));
969 soisdisconnected(so);
971 udbinfo_barrier_set();
973 udbinfo_barrier_rem();
978 lwkt_replymsg(&msg->abort.base.lmsg, error);
982 udp_attach(netmsg_t msg)
984 struct socket *so = msg->attach.base.nm_so;
985 struct pru_attach_info *ai = msg->attach.nm_ai;
989 KKASSERT(&curthread->td_msgport == cpu_portfn(0));
996 error = soreserve(so, udp_sendspace, udp_recvspace, ai->sb_rlimit);
1000 udbinfo_barrier_set();
1001 error = in_pcballoc(so, &udbinfo);
1002 udbinfo_barrier_rem();
1008 * Set default port for protocol processing prior to bind/connect.
1010 sosetport(so, cpu_portfn(0));
1012 inp = (struct inpcb *)so->so_pcb;
1013 inp->inp_vflag |= INP_IPV4;
1014 inp->inp_ip_ttl = ip_defttl;
1017 lwkt_replymsg(&msg->attach.base.lmsg, error);
1021 udp_bind(netmsg_t msg)
1023 struct socket *so = msg->bind.base.nm_so;
1024 struct sockaddr *nam = msg->bind.nm_nam;
1025 struct thread *td = msg->bind.nm_td;
1026 struct sockaddr_in *sin = (struct sockaddr_in *)nam;
1032 error = in_pcbbind(inp, nam, td);
1034 if (sin->sin_addr.s_addr != INADDR_ANY)
1035 inp->inp_flags |= INP_WASBOUND_NOTANY;
1037 udbinfo_barrier_set();
1038 in_pcbinswildcardhash(inp);
1039 udbinfo_barrier_rem();
1044 lwkt_replymsg(&msg->bind.base.lmsg, error);
1048 udp_connect(netmsg_t msg)
1050 struct socket *so = msg->connect.base.nm_so;
1051 struct sockaddr *nam = msg->connect.nm_nam;
1052 struct thread *td = msg->connect.nm_td;
1054 struct sockaddr_in *sin = (struct sockaddr_in *)nam;
1055 struct sockaddr_in *if_sin;
1059 KKASSERT(&curthread->td_msgport == cpu_portfn(0));
1067 if (msg->connect.nm_reconnect & NMSG_RECONNECT_RECONNECT) {
1068 panic("UDP does not support RECONNECT\n");
1070 msg->connect.nm_reconnect &= ~NMSG_RECONNECT_RECONNECT;
1071 in_pcblink(inp, &udbinfo);
1075 if (inp->inp_faddr.s_addr != INADDR_ANY) {
1082 * Bind if we have to
1084 if (td->td_proc && td->td_proc->p_ucred->cr_prison != NULL &&
1085 inp->inp_laddr.s_addr == INADDR_ANY) {
1086 error = in_pcbbind(inp, NULL, td);
1092 * Calculate the correct protocol processing thread. The connect
1093 * operation must run there.
1095 error = in_pcbladdr(inp, nam, &if_sin, td);
1098 if (!prison_remote_ip(td, nam)) {
1099 error = EAFNOSUPPORT; /* IPv6 only jail */
1103 port = udp_addrport(sin->sin_addr.s_addr, sin->sin_port,
1104 inp->inp_laddr.s_addr, inp->inp_lport);
1106 if (port != &curthread->td_msgport) {
1108 struct route *ro = &inp->inp_route;
1111 * in_pcbladdr() may have allocated a route entry for us
1112 * on the current CPU, but we need a route entry on the
1113 * inpcb's owner CPU, so free it here.
1115 if (ro->ro_rt != NULL)
1117 bzero(ro, sizeof(*ro));
1120 * We are moving the protocol processing port the socket
1121 * is on, we have to unlink here and re-link on the
1124 in_pcbunlink(so->so_pcb, &udbinfo);
1125 /* in_pcbunlink(so->so_pcb, &udbinfo[mycpu->gd_cpuid]); */
1126 sosetport(so, port);
1127 msg->connect.nm_reconnect |= NMSG_RECONNECT_RECONNECT;
1128 msg->connect.base.nm_dispatch = udp_connect;
1130 lwkt_forwardmsg(port, &msg->connect.base.lmsg);
1131 /* msg invalid now */
1134 panic("UDP activity should only be in netisr0");
1138 KKASSERT(port == &curthread->td_msgport);
1139 error = udp_connect_oncpu(so, td, sin, if_sin);
1141 KKASSERT(msg->connect.nm_m == NULL);
1142 lwkt_replymsg(&msg->connect.base.lmsg, error);
1146 udp_connect_oncpu(struct socket *so, struct thread *td,
1147 struct sockaddr_in *sin, struct sockaddr_in *if_sin)
1152 udbinfo_barrier_set();
1155 if (inp->inp_flags & INP_WILDCARD)
1156 in_pcbremwildcardhash(inp);
1157 error = in_pcbconnect(inp, (struct sockaddr *)sin, td);
1161 * No more errors can occur, finish adjusting the socket
1162 * and change the processing port to reflect the connected
1163 * socket. Once set we can no longer safely mess with the
1167 } else if (error == EAFNOSUPPORT) { /* connection dissolved */
1169 * Follow traditional BSD behavior and retain
1170 * the local port binding. But, fix the old misbehavior
1171 * of overwriting any previously bound local address.
1173 if (!(inp->inp_flags & INP_WASBOUND_NOTANY))
1174 inp->inp_laddr.s_addr = INADDR_ANY;
1175 in_pcbinswildcardhash(inp);
1178 udbinfo_barrier_rem();
1183 udp_detach(netmsg_t msg)
1185 struct socket *so = msg->detach.base.nm_so;
1189 KKASSERT(&curthread->td_msgport == cpu_portfn(0));
1193 udbinfo_barrier_set();
1195 udbinfo_barrier_rem();
1200 lwkt_replymsg(&msg->detach.base.lmsg, error);
1204 udp_disconnect(netmsg_t msg)
1206 struct socket *so = msg->disconnect.base.nm_so;
1211 KKASSERT(&curthread->td_msgport == cpu_portfn(0));
1218 if (inp->inp_faddr.s_addr == INADDR_ANY) {
1225 udbinfo_barrier_set();
1226 in_pcbdisconnect(inp);
1227 udbinfo_barrier_rem();
1229 soclrstate(so, SS_ISCONNECTED); /* XXX */
1232 ro = &inp->inp_route;
1233 if (ro->ro_rt != NULL)
1235 bzero(ro, sizeof(*ro));
1238 lwkt_replymsg(&msg->disconnect.base.lmsg, error);
1242 udp_send(netmsg_t msg)
1244 struct socket *so = msg->send.base.nm_so;
1245 struct mbuf *m = msg->send.nm_m;
1246 struct sockaddr *addr = msg->send.nm_addr;
1247 int pru_flags = msg->send.nm_flags;
1251 KKASSERT(&curthread->td_msgport == cpu_portfn(0));
1252 KKASSERT(msg->send.nm_control == NULL);
1256 struct thread *td = msg->send.nm_td;
1259 if (pru_flags & PRUS_DONTROUTE)
1260 flags |= SO_DONTROUTE;
1261 error = udp_output(inp, m, addr, td, flags);
1267 if (pru_flags & PRUS_FREEADDR)
1268 kfree(addr, M_SONAME);
1270 if ((pru_flags & PRUS_NOREPLY) == 0)
1271 lwkt_replymsg(&msg->send.base.lmsg, error);
1275 udp_shutdown(netmsg_t msg)
1277 struct socket *so = msg->shutdown.base.nm_so;
1281 KKASSERT(&curthread->td_msgport == cpu_portfn(0));
1290 lwkt_replymsg(&msg->shutdown.base.lmsg, error);
1296 lwkt_serialize_enter(&udbinfo_slize);
1300 udbinfo_unlock(void)
1302 lwkt_serialize_exit(&udbinfo_slize);
1306 udbinfo_barrier_set(void)
1308 netisr_barrier_set(udbinfo_br);
1313 udbinfo_barrier_rem(void)
1316 netisr_barrier_rem(udbinfo_br);
1319 struct pr_usrreqs udp_usrreqs = {
1320 .pru_abort = udp_abort,
1321 .pru_accept = pr_generic_notsupp,
1322 .pru_attach = udp_attach,
1323 .pru_bind = udp_bind,
1324 .pru_connect = udp_connect,
1325 .pru_connect2 = pr_generic_notsupp,
1326 .pru_control = in_control_dispatch,
1327 .pru_detach = udp_detach,
1328 .pru_disconnect = udp_disconnect,
1329 .pru_listen = pr_generic_notsupp,
1330 .pru_peeraddr = in_setpeeraddr_dispatch,
1331 .pru_rcvd = pr_generic_notsupp,
1332 .pru_rcvoob = pr_generic_notsupp,
1333 .pru_send = udp_send,
1334 .pru_sense = pru_sense_null,
1335 .pru_shutdown = udp_shutdown,
1336 .pru_sockaddr = in_setsockaddr_dispatch,
1337 .pru_sosend = sosendudp,
1338 .pru_soreceive = soreceive