2 * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995
3 * The Regents of the University of California.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 4. Neither the name of the University nor the names of its contributors
15 * may be used to endorse or promote products derived from this software
16 * without specific prior written permission.
18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * @(#)udp_usrreq.c 8.6 (Berkeley) 5/23/95
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
37 #include "opt_inet6.h"
38 #include "opt_ipsec.h"
41 #include <sys/param.h>
42 #include <sys/domain.h>
43 #include <sys/eventhandler.h>
45 #include <sys/kernel.h>
47 #include <sys/malloc.h>
51 #include <sys/protosw.h>
52 #include <sys/signalvar.h>
53 #include <sys/socket.h>
54 #include <sys/socketvar.h>
56 #include <sys/sysctl.h>
57 #include <sys/syslog.h>
58 #include <sys/systm.h>
63 #include <net/route.h>
65 #include <netinet/in.h>
66 #include <netinet/in_pcb.h>
67 #include <netinet/in_systm.h>
68 #include <netinet/in_var.h>
69 #include <netinet/ip.h>
71 #include <netinet/ip6.h>
73 #include <netinet/ip_icmp.h>
74 #include <netinet/icmp_var.h>
75 #include <netinet/ip_var.h>
76 #include <netinet/ip_options.h>
78 #include <netinet6/ip6_var.h>
80 #include <netinet/udp.h>
81 #include <netinet/udp_var.h>
84 #include <netipsec/ipsec.h>
87 #include <machine/in_cksum.h>
89 #include <security/mac/mac_framework.h>
92 * UDP protocol implementation.
93 * Per RFC 768, August, 1980.
97 * BSD 4.2 defaulted the udp checksum to be off. Turning off udp checksums
98 * removes the only data integrity mechanism for packets and malformed
99 * packets that would otherwise be discarded due to bad checksums, and may
100 * cause problems (especially for NFS data blocks).
102 static int udp_cksum = 1;
103 SYSCTL_INT(_net_inet_udp, UDPCTL_CHECKSUM, checksum, CTLFLAG_RW, &udp_cksum,
106 int udp_log_in_vain = 0;
107 SYSCTL_INT(_net_inet_udp, OID_AUTO, log_in_vain, CTLFLAG_RW,
108 &udp_log_in_vain, 0, "Log all incoming UDP packets");
110 int udp_blackhole = 0;
111 SYSCTL_INT(_net_inet_udp, OID_AUTO, blackhole, CTLFLAG_RW, &udp_blackhole, 0,
112 "Do not send port unreachables for refused connects");
114 u_long udp_sendspace = 9216; /* really max datagram size */
115 /* 40 1K datagrams */
116 SYSCTL_ULONG(_net_inet_udp, UDPCTL_MAXDGRAM, maxdgram, CTLFLAG_RW,
117 &udp_sendspace, 0, "Maximum outgoing UDP datagram size");
119 u_long udp_recvspace = 40 * (1024 +
121 sizeof(struct sockaddr_in6)
123 sizeof(struct sockaddr_in)
127 SYSCTL_ULONG(_net_inet_udp, UDPCTL_RECVSPACE, recvspace, CTLFLAG_RW,
128 &udp_recvspace, 0, "Maximum space for incoming UDP datagrams");
130 struct inpcbhead udb; /* from udp_var.h */
131 struct inpcbinfo udbinfo;
134 #define UDBHASHSIZE 16
137 struct udpstat udpstat; /* from udp_var.h */
138 SYSCTL_STRUCT(_net_inet_udp, UDPCTL_STATS, stats, CTLFLAG_RW, &udpstat,
139 udpstat, "UDP statistics (struct udpstat, netinet/udp_var.h)");
141 static void udp_detach(struct socket *so);
142 static int udp_output(struct inpcb *, struct mbuf *, struct sockaddr *,
143 struct mbuf *, struct thread *);
146 udp_zone_change(void *tag)
149 uma_zone_set_max(udbinfo.ipi_zone, maxsockets);
153 udp_inpcb_init(void *mem, int size, int flags)
158 INP_LOCK_INIT(inp, "inp", "udpinp");
166 INP_INFO_LOCK_INIT(&udbinfo, "udp");
168 udbinfo.ipi_listhead = &udb;
169 udbinfo.ipi_hashbase = hashinit(UDBHASHSIZE, M_PCB,
170 &udbinfo.ipi_hashmask);
171 udbinfo.ipi_porthashbase = hashinit(UDBHASHSIZE, M_PCB,
172 &udbinfo.ipi_porthashmask);
173 udbinfo.ipi_zone = uma_zcreate("udpcb", sizeof(struct inpcb), NULL,
174 NULL, udp_inpcb_init, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
175 uma_zone_set_max(udbinfo.ipi_zone, maxsockets);
176 EVENTHANDLER_REGISTER(maxsockets_change, udp_zone_change, NULL,
177 EVENTHANDLER_PRI_ANY);
181 * Subroutine of udp_input(), which appends the provided mbuf chain to the
182 * passed pcb/socket. The caller must provide a sockaddr_in via udp_in that
183 * contains the source address. If the socket ends up being an IPv6 socket,
184 * udp_append() will convert to a sockaddr_in6 before passing the address
185 * into the socket code.
188 udp_append(struct inpcb *inp, struct ip *ip, struct mbuf *n, int off,
189 struct sockaddr_in *udp_in)
191 struct sockaddr *append_sa;
193 struct mbuf *opts = 0;
195 struct sockaddr_in6 udp_in6;
198 INP_RLOCK_ASSERT(inp);
201 /* Check AH/ESP integrity. */
202 if (ipsec4_in_reject(n, inp)) {
204 ipsec4stat.in_polvio++;
209 if (mac_inpcb_check_deliver(inp, n) != 0) {
214 if (inp->inp_flags & INP_CONTROLOPTS ||
215 inp->inp_socket->so_options & (SO_TIMESTAMP | SO_BINTIME)) {
217 if (inp->inp_vflag & INP_IPV6)
218 ip6_savecontrol_v4(inp, n, &opts);
221 ip_savecontrol(inp, &opts, ip, n);
224 if (inp->inp_vflag & INP_IPV6) {
225 bzero(&udp_in6, sizeof(udp_in6));
226 udp_in6.sin6_len = sizeof(udp_in6);
227 udp_in6.sin6_family = AF_INET6;
228 in6_sin_2_v4mapsin6(udp_in, &udp_in6);
229 append_sa = (struct sockaddr *)&udp_in6;
232 append_sa = (struct sockaddr *)udp_in;
235 so = inp->inp_socket;
236 SOCKBUF_LOCK(&so->so_rcv);
237 if (sbappendaddr_locked(&so->so_rcv, append_sa, n, opts) == 0) {
238 SOCKBUF_UNLOCK(&so->so_rcv);
242 udpstat.udps_fullsock++;
244 sorwakeup_locked(so);
248 udp_input(struct mbuf *m, int off)
257 struct sockaddr_in udp_in;
258 #ifdef IPFIREWALL_FORWARD
259 struct m_tag *fwd_tag;
262 ifp = m->m_pkthdr.rcvif;
263 udpstat.udps_ipackets++;
266 * Strip IP options, if any; should skip this, make available to
267 * user, and use on returned packets, but we don't yet have a way to
268 * check the checksum with options still present.
270 if (iphlen > sizeof (struct ip)) {
271 ip_stripoptions(m, (struct mbuf *)0);
272 iphlen = sizeof(struct ip);
276 * Get IP and UDP header together in first mbuf.
278 ip = mtod(m, struct ip *);
279 if (m->m_len < iphlen + sizeof(struct udphdr)) {
280 if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == 0) {
281 udpstat.udps_hdrops++;
284 ip = mtod(m, struct ip *);
286 uh = (struct udphdr *)((caddr_t)ip + iphlen);
289 * Destination port of 0 is illegal, based on RFC768.
291 if (uh->uh_dport == 0)
295 * Construct sockaddr format source address. Stuff source address
296 * and datagram in user buffer.
298 bzero(&udp_in, sizeof(udp_in));
299 udp_in.sin_len = sizeof(udp_in);
300 udp_in.sin_family = AF_INET;
301 udp_in.sin_port = uh->uh_sport;
302 udp_in.sin_addr = ip->ip_src;
305 * Make mbuf data length reflect UDP length. If not enough data to
306 * reflect UDP length, drop.
308 len = ntohs((u_short)uh->uh_ulen);
309 if (ip->ip_len != len) {
310 if (len > ip->ip_len || len < sizeof(struct udphdr)) {
311 udpstat.udps_badlen++;
314 m_adj(m, len - ip->ip_len);
315 /* ip->ip_len = len; */
319 * Save a copy of the IP header in case we want restore it for
320 * sending an ICMP error message in response.
325 memset(&save_ip, 0, sizeof(save_ip));
328 * Checksum extended UDP header and data.
333 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) {
334 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR)
335 uh_sum = m->m_pkthdr.csum_data;
337 uh_sum = in_pseudo(ip->ip_src.s_addr,
338 ip->ip_dst.s_addr, htonl((u_short)len +
339 m->m_pkthdr.csum_data + IPPROTO_UDP));
344 bcopy(((struct ipovly *)ip)->ih_x1, b, 9);
345 bzero(((struct ipovly *)ip)->ih_x1, 9);
346 ((struct ipovly *)ip)->ih_len = uh->uh_ulen;
347 uh_sum = in_cksum(m, len + sizeof (struct ip));
348 bcopy(b, ((struct ipovly *)ip)->ih_x1, 9);
351 udpstat.udps_badsum++;
356 udpstat.udps_nosum++;
358 #ifdef IPFIREWALL_FORWARD
360 * Grab info from PACKET_TAG_IPFORWARD tag prepended to the chain.
362 fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL);
363 if (fwd_tag != NULL) {
364 struct sockaddr_in *next_hop;
369 next_hop = (struct sockaddr_in *)(fwd_tag + 1);
370 ip->ip_dst = next_hop->sin_addr;
371 uh->uh_dport = ntohs(next_hop->sin_port);
374 * Remove the tag from the packet. We don't need it anymore.
376 m_tag_delete(m, fwd_tag);
380 INP_INFO_RLOCK(&udbinfo);
381 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) ||
382 in_broadcast(ip->ip_dst, ifp)) {
384 struct ip_moptions *imo;
387 LIST_FOREACH(inp, &udb, inp_list) {
388 if (inp->inp_lport != uh->uh_dport)
391 if ((inp->inp_vflag & INP_IPV4) == 0)
394 if (inp->inp_laddr.s_addr != INADDR_ANY &&
395 inp->inp_laddr.s_addr != ip->ip_dst.s_addr)
397 if (inp->inp_faddr.s_addr != INADDR_ANY &&
398 inp->inp_faddr.s_addr != ip->ip_src.s_addr)
401 * XXX: Do not check source port of incoming datagram
402 * unless inp_connect() has been called to bind the
403 * fport part of the 4-tuple; the source could be
404 * trying to talk to us with an ephemeral port.
406 if (inp->inp_fport != 0 &&
407 inp->inp_fport != uh->uh_sport)
413 * Handle socket delivery policy for any-source
414 * and source-specific multicast. [RFC3678]
416 imo = inp->inp_moptions;
417 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) &&
419 struct sockaddr_in sin;
420 struct in_msource *ims;
424 bzero(&sin, sizeof(struct sockaddr_in));
425 sin.sin_len = sizeof(struct sockaddr_in);
426 sin.sin_family = AF_INET;
427 sin.sin_addr = ip->ip_dst;
430 idx = imo_match_group(imo, ifp,
431 (struct sockaddr *)&sin);
434 * No group membership for this socket.
435 * Do not bump udps_noportbcast, as
436 * this will happen further down.
441 * Check for a multicast source filter
442 * entry on this socket for this group.
443 * MCAST_EXCLUDE is the default
444 * behaviour. It means default accept;
445 * entries, if present, denote sources
446 * to be excluded from delivery.
448 ims = imo_match_source(imo, idx,
449 (struct sockaddr *)&udp_in);
450 mode = imo->imo_mfilters[idx].imf_fmode;
452 mode == MCAST_EXCLUDE) ||
454 mode == MCAST_INCLUDE)) {
457 printf("%s: blocked by"
462 udpstat.udps_filtermcast++;
474 n = m_copy(m, 0, M_COPYALL);
476 udp_append(last, ip, n, iphlen +
477 sizeof(struct udphdr), &udp_in);
482 * Don't look for additional matches if this one does
483 * not have either the SO_REUSEPORT or SO_REUSEADDR
484 * socket options set. This heuristic avoids
485 * searching through all pcbs in the common case of a
486 * non-shared port. It assumes that an application
487 * will never clear these options after setting them.
489 if ((last->inp_socket->so_options &
490 (SO_REUSEPORT|SO_REUSEADDR)) == 0)
496 * No matching pcb found; discard datagram. (No need
497 * to send an ICMP Port Unreachable for a broadcast
498 * or multicast datgram.)
500 udpstat.udps_noportbcast++;
503 udp_append(last, ip, m, iphlen + sizeof(struct udphdr),
506 INP_INFO_RUNLOCK(&udbinfo);
511 * Locate pcb for datagram.
513 inp = in_pcblookup_hash(&udbinfo, ip->ip_src, uh->uh_sport,
514 ip->ip_dst, uh->uh_dport, 1, ifp);
516 if (udp_log_in_vain) {
517 char buf[4*sizeof "123"];
519 strcpy(buf, inet_ntoa(ip->ip_dst));
521 "Connection attempt to UDP %s:%d from %s:%d\n",
522 buf, ntohs(uh->uh_dport), inet_ntoa(ip->ip_src),
523 ntohs(uh->uh_sport));
525 udpstat.udps_noport++;
526 if (m->m_flags & (M_BCAST | M_MCAST)) {
527 udpstat.udps_noportbcast++;
532 if (badport_bandlim(BANDLIM_ICMP_UNREACH) < 0)
535 ip->ip_len += iphlen;
536 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
537 INP_INFO_RUNLOCK(&udbinfo);
542 * Check the minimum TTL for socket.
545 INP_INFO_RUNLOCK(&udbinfo);
546 if (inp->inp_ip_minttl && inp->inp_ip_minttl > ip->ip_ttl) {
550 udp_append(inp, ip, m, iphlen + sizeof(struct udphdr), &udp_in);
557 INP_INFO_RUNLOCK(&udbinfo);
563 * Notify a udp user of an asynchronous error; just wake up so that they can
564 * collect error status.
567 udp_notify(struct inpcb *inp, int errno)
570 INP_WLOCK_ASSERT(inp);
572 inp->inp_socket->so_error = errno;
573 sorwakeup(inp->inp_socket);
574 sowwakeup(inp->inp_socket);
579 udp_ctlinput(int cmd, struct sockaddr *sa, void *vip)
583 struct in_addr faddr;
586 faddr = ((struct sockaddr_in *)sa)->sin_addr;
587 if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY)
591 * Redirects don't need to be handled up here.
593 if (PRC_IS_REDIRECT(cmd))
597 * Hostdead is ugly because it goes linearly through all PCBs.
599 * XXX: We never get this from ICMP, otherwise it makes an excellent
600 * DoS attack on machines with many connections.
602 if (cmd == PRC_HOSTDEAD)
604 else if ((unsigned)cmd >= PRC_NCMDS || inetctlerrmap[cmd] == 0)
607 uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
608 INP_INFO_RLOCK(&udbinfo);
609 inp = in_pcblookup_hash(&udbinfo, faddr, uh->uh_dport,
610 ip->ip_src, uh->uh_sport, 0, NULL);
613 if (inp->inp_socket != NULL) {
614 udp_notify(inp, inetctlerrmap[cmd]);
618 INP_INFO_RUNLOCK(&udbinfo);
620 in_pcbnotifyall(&udbinfo, faddr, inetctlerrmap[cmd],
625 udp_pcblist(SYSCTL_HANDLER_ARGS)
628 struct inpcb *inp, **inp_list;
633 * The process of preparing the PCB list is too time-consuming and
634 * resource-intensive to repeat twice on every request.
636 if (req->oldptr == 0) {
637 n = udbinfo.ipi_count;
638 req->oldidx = 2 * (sizeof xig)
639 + (n + n/8) * sizeof(struct xinpcb);
643 if (req->newptr != 0)
647 * OK, now we're committed to doing something.
649 INP_INFO_RLOCK(&udbinfo);
650 gencnt = udbinfo.ipi_gencnt;
651 n = udbinfo.ipi_count;
652 INP_INFO_RUNLOCK(&udbinfo);
654 error = sysctl_wire_old_buffer(req, 2 * (sizeof xig)
655 + n * sizeof(struct xinpcb));
659 xig.xig_len = sizeof xig;
661 xig.xig_gen = gencnt;
662 xig.xig_sogen = so_gencnt;
663 error = SYSCTL_OUT(req, &xig, sizeof xig);
667 inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK);
671 INP_INFO_RLOCK(&udbinfo);
672 for (inp = LIST_FIRST(udbinfo.ipi_listhead), i = 0; inp && i < n;
673 inp = LIST_NEXT(inp, inp_list)) {
675 if (inp->inp_gencnt <= gencnt &&
676 cr_canseesocket(req->td->td_ucred, inp->inp_socket) == 0)
680 INP_INFO_RUNLOCK(&udbinfo);
684 for (i = 0; i < n; i++) {
687 if (inp->inp_gencnt <= gencnt) {
689 bzero(&xi, sizeof(xi));
690 xi.xi_len = sizeof xi;
691 /* XXX should avoid extra copy */
692 bcopy(inp, &xi.xi_inp, sizeof *inp);
694 sotoxsocket(inp->inp_socket, &xi.xi_socket);
695 xi.xi_inp.inp_gencnt = inp->inp_gencnt;
697 error = SYSCTL_OUT(req, &xi, sizeof xi);
703 * Give the user an updated idea of our state. If the
704 * generation differs from what we told her before, she knows
705 * that something happened while we were processing this
706 * request, and it might be necessary to retry.
708 INP_INFO_RLOCK(&udbinfo);
709 xig.xig_gen = udbinfo.ipi_gencnt;
710 xig.xig_sogen = so_gencnt;
711 xig.xig_count = udbinfo.ipi_count;
712 INP_INFO_RUNLOCK(&udbinfo);
713 error = SYSCTL_OUT(req, &xig, sizeof xig);
715 free(inp_list, M_TEMP);
719 SYSCTL_PROC(_net_inet_udp, UDPCTL_PCBLIST, pcblist, CTLFLAG_RD, 0, 0,
720 udp_pcblist, "S,xinpcb", "List of active UDP sockets");
723 udp_getcred(SYSCTL_HANDLER_ARGS)
726 struct sockaddr_in addrs[2];
730 error = priv_check(req->td, PRIV_NETINET_GETCRED);
733 error = SYSCTL_IN(req, addrs, sizeof(addrs));
736 INP_INFO_RLOCK(&udbinfo);
737 inp = in_pcblookup_hash(&udbinfo, addrs[1].sin_addr, addrs[1].sin_port,
738 addrs[0].sin_addr, addrs[0].sin_port, 1, NULL);
741 INP_INFO_RUNLOCK(&udbinfo);
742 if (inp->inp_socket == NULL)
745 error = cr_canseesocket(req->td->td_ucred,
748 cru2x(inp->inp_socket->so_cred, &xuc);
751 INP_INFO_RUNLOCK(&udbinfo);
755 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
759 SYSCTL_PROC(_net_inet_udp, OID_AUTO, getcred,
760 CTLTYPE_OPAQUE|CTLFLAG_RW|CTLFLAG_PRISON, 0, 0,
761 udp_getcred, "S,xucred", "Get the xucred of a UDP connection");
764 udp_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *addr,
765 struct mbuf *control, struct thread *td)
768 int len = m->m_pkthdr.len;
769 struct in_addr faddr, laddr;
771 struct sockaddr_in *sin, src;
774 u_short fport, lport;
778 * udp_output() may need to temporarily bind or connect the current
779 * inpcb. As such, we don't know up front whether we will need the
780 * pcbinfo lock or not. Do any work to decide what is needed up
781 * front before acquiring any locks.
783 if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) {
791 if (control != NULL) {
793 * XXX: Currently, we assume all the optional information is
794 * stored in a single mbuf.
796 if (control->m_next) {
801 for (; control->m_len > 0;
802 control->m_data += CMSG_ALIGN(cm->cmsg_len),
803 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) {
804 cm = mtod(control, struct cmsghdr *);
805 if (control->m_len < sizeof(*cm) || cm->cmsg_len == 0
806 || cm->cmsg_len > control->m_len) {
810 if (cm->cmsg_level != IPPROTO_IP)
813 switch (cm->cmsg_type) {
816 CMSG_LEN(sizeof(struct in_addr))) {
820 bzero(&src, sizeof(src));
821 src.sin_family = AF_INET;
822 src.sin_len = sizeof(src);
823 src.sin_port = inp->inp_lport;
825 *(struct in_addr *)CMSG_DATA(cm);
842 if (src.sin_family == AF_INET || addr != NULL) {
843 INP_INFO_WLOCK(&udbinfo);
852 mac_inpcb_create_mbuf(inp, m);
856 * If the IP_SENDSRCADDR control message was specified, override the
857 * source address for this datagram. Its use is invalidated if the
858 * address thus specified is incomplete or clobbers other inpcbs.
860 laddr = inp->inp_laddr;
861 lport = inp->inp_lport;
862 if (src.sin_family == AF_INET) {
863 INP_INFO_LOCK_ASSERT(&udbinfo);
865 (laddr.s_addr == INADDR_ANY &&
866 src.sin_addr.s_addr == INADDR_ANY)) {
870 error = in_pcbbind_setup(inp, (struct sockaddr *)&src,
871 &laddr.s_addr, &lport, td->td_ucred);
877 INP_INFO_LOCK_ASSERT(&udbinfo);
878 INP_LOCK_ASSERT(inp);
879 sin = (struct sockaddr_in *)addr;
880 if (jailed(td->td_ucred))
881 prison_remote_ip(td->td_ucred, 0,
882 &sin->sin_addr.s_addr);
883 if (inp->inp_faddr.s_addr != INADDR_ANY) {
887 error = in_pcbconnect_setup(inp, addr, &laddr.s_addr, &lport,
888 &faddr.s_addr, &fport, NULL, td->td_ucred);
892 /* Commit the local port if newly assigned. */
893 if (inp->inp_laddr.s_addr == INADDR_ANY &&
894 inp->inp_lport == 0) {
895 INP_INFO_WLOCK_ASSERT(&udbinfo);
896 INP_WLOCK_ASSERT(inp);
898 * Remember addr if jailed, to prevent rebinding.
900 if (jailed(td->td_ucred))
901 inp->inp_laddr = laddr;
902 inp->inp_lport = lport;
903 if (in_pcbinshash(inp) != 0) {
908 inp->inp_flags |= INP_ANONPORT;
911 INP_LOCK_ASSERT(inp);
912 faddr = inp->inp_faddr;
913 fport = inp->inp_fport;
914 if (faddr.s_addr == INADDR_ANY) {
921 * Calculate data length and get a mbuf for UDP, IP, and possible
922 * link-layer headers. Immediate slide the data pointer back forward
923 * since we won't use that space at this layer.
925 M_PREPEND(m, sizeof(struct udpiphdr) + max_linkhdr, M_DONTWAIT);
930 m->m_data += max_linkhdr;
931 m->m_len -= max_linkhdr;
932 m->m_pkthdr.len -= max_linkhdr;
935 * Fill in mbuf with extended UDP header and addresses and length put
936 * into network format.
938 ui = mtod(m, struct udpiphdr *);
939 bzero(ui->ui_x1, sizeof(ui->ui_x1)); /* XXX still needed? */
940 ui->ui_pr = IPPROTO_UDP;
943 ui->ui_sport = lport;
944 ui->ui_dport = fport;
945 ui->ui_ulen = htons((u_short)len + sizeof(struct udphdr));
948 * Set the Don't Fragment bit in the IP header.
950 if (inp->inp_flags & INP_DONTFRAG) {
953 ip = (struct ip *)&ui->ui_i;
958 if (inp->inp_socket->so_options & SO_DONTROUTE)
959 ipflags |= IP_ROUTETOIF;
960 if (inp->inp_socket->so_options & SO_BROADCAST)
961 ipflags |= IP_ALLOWBROADCAST;
962 if (inp->inp_flags & INP_ONESBCAST)
963 ipflags |= IP_SENDONES;
966 * Set up checksum and output datagram.
969 if (inp->inp_flags & INP_ONESBCAST)
970 faddr.s_addr = INADDR_BROADCAST;
971 ui->ui_sum = in_pseudo(ui->ui_src.s_addr, faddr.s_addr,
972 htons((u_short)len + sizeof(struct udphdr) + IPPROTO_UDP));
973 m->m_pkthdr.csum_flags = CSUM_UDP;
974 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
977 ((struct ip *)ui)->ip_len = sizeof (struct udpiphdr) + len;
978 ((struct ip *)ui)->ip_ttl = inp->inp_ip_ttl; /* XXX */
979 ((struct ip *)ui)->ip_tos = inp->inp_ip_tos; /* XXX */
980 udpstat.udps_opackets++;
983 INP_INFO_WUNLOCK(&udbinfo);
984 error = ip_output(m, inp->inp_options, NULL, ipflags,
985 inp->inp_moptions, inp);
993 if (unlock_udbinfo) {
994 INP_INFO_WUNLOCK(&udbinfo);
1003 udp_abort(struct socket *so)
1007 inp = sotoinpcb(so);
1008 KASSERT(inp != NULL, ("udp_abort: inp == NULL"));
1009 INP_INFO_WLOCK(&udbinfo);
1011 if (inp->inp_faddr.s_addr != INADDR_ANY) {
1012 in_pcbdisconnect(inp);
1013 inp->inp_laddr.s_addr = INADDR_ANY;
1014 soisdisconnected(so);
1017 INP_INFO_WUNLOCK(&udbinfo);
1021 udp_attach(struct socket *so, int proto, struct thread *td)
1026 inp = sotoinpcb(so);
1027 KASSERT(inp == NULL, ("udp_attach: inp != NULL"));
1028 error = soreserve(so, udp_sendspace, udp_recvspace);
1031 INP_INFO_WLOCK(&udbinfo);
1032 error = in_pcballoc(so, &udbinfo);
1034 INP_INFO_WUNLOCK(&udbinfo);
1038 inp = (struct inpcb *)so->so_pcb;
1039 INP_INFO_WUNLOCK(&udbinfo);
1040 inp->inp_vflag |= INP_IPV4;
1041 inp->inp_ip_ttl = ip_defttl;
1047 udp_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
1052 inp = sotoinpcb(so);
1053 KASSERT(inp != NULL, ("udp_bind: inp == NULL"));
1054 INP_INFO_WLOCK(&udbinfo);
1056 error = in_pcbbind(inp, nam, td->td_ucred);
1058 INP_INFO_WUNLOCK(&udbinfo);
1063 udp_close(struct socket *so)
1067 inp = sotoinpcb(so);
1068 KASSERT(inp != NULL, ("udp_close: inp == NULL"));
1069 INP_INFO_WLOCK(&udbinfo);
1071 if (inp->inp_faddr.s_addr != INADDR_ANY) {
1072 in_pcbdisconnect(inp);
1073 inp->inp_laddr.s_addr = INADDR_ANY;
1074 soisdisconnected(so);
1077 INP_INFO_WUNLOCK(&udbinfo);
1081 udp_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
1085 struct sockaddr_in *sin;
1087 inp = sotoinpcb(so);
1088 KASSERT(inp != NULL, ("udp_connect: inp == NULL"));
1089 INP_INFO_WLOCK(&udbinfo);
1091 if (inp->inp_faddr.s_addr != INADDR_ANY) {
1093 INP_INFO_WUNLOCK(&udbinfo);
1096 sin = (struct sockaddr_in *)nam;
1097 if (jailed(td->td_ucred))
1098 prison_remote_ip(td->td_ucred, 0, &sin->sin_addr.s_addr);
1099 error = in_pcbconnect(inp, nam, td->td_ucred);
1103 INP_INFO_WUNLOCK(&udbinfo);
1108 udp_detach(struct socket *so)
1112 inp = sotoinpcb(so);
1113 KASSERT(inp != NULL, ("udp_detach: inp == NULL"));
1114 KASSERT(inp->inp_faddr.s_addr == INADDR_ANY,
1115 ("udp_detach: not disconnected"));
1116 INP_INFO_WLOCK(&udbinfo);
1120 INP_INFO_WUNLOCK(&udbinfo);
1124 udp_disconnect(struct socket *so)
1128 inp = sotoinpcb(so);
1129 KASSERT(inp != NULL, ("udp_disconnect: inp == NULL"));
1130 INP_INFO_WLOCK(&udbinfo);
1132 if (inp->inp_faddr.s_addr == INADDR_ANY) {
1134 INP_INFO_WUNLOCK(&udbinfo);
1138 in_pcbdisconnect(inp);
1139 inp->inp_laddr.s_addr = INADDR_ANY;
1141 so->so_state &= ~SS_ISCONNECTED; /* XXX */
1144 INP_INFO_WUNLOCK(&udbinfo);
1149 udp_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
1150 struct mbuf *control, struct thread *td)
1154 inp = sotoinpcb(so);
1155 KASSERT(inp != NULL, ("udp_send: inp == NULL"));
1156 return (udp_output(inp, m, addr, control, td));
1160 udp_shutdown(struct socket *so)
1164 inp = sotoinpcb(so);
1165 KASSERT(inp != NULL, ("udp_shutdown: inp == NULL"));
1172 struct pr_usrreqs udp_usrreqs = {
1173 .pru_abort = udp_abort,
1174 .pru_attach = udp_attach,
1175 .pru_bind = udp_bind,
1176 .pru_connect = udp_connect,
1177 .pru_control = in_control,
1178 .pru_detach = udp_detach,
1179 .pru_disconnect = udp_disconnect,
1180 .pru_peeraddr = in_getpeeraddr,
1181 .pru_send = udp_send,
1182 .pru_soreceive = soreceive_dgram,
1183 .pru_sosend = sosend_dgram,
1184 .pru_shutdown = udp_shutdown,
1185 .pru_sockaddr = in_getsockaddr,
1186 .pru_sosetlabel = in_pcbsosetlabel,
1187 .pru_close = udp_close,