2 * Copyright (c) 2004 Jeffrey Hsu. All rights reserved.
3 * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995
4 * The Regents of the University of California. All rights reserved.
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 * 3. All advertising materials mentioning features or use of this software
15 * must display the following acknowledgement:
16 * This product includes software developed by the University of
17 * California, Berkeley and its contributors.
18 * 4. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * @(#)udp_usrreq.c 8.6 (Berkeley) 5/23/95
35 * $FreeBSD: src/sys/netinet/udp_usrreq.c,v 1.64.2.18 2003/01/24 05:11:34 sam Exp $
36 * $DragonFly: src/sys/netinet/udp_usrreq.c,v 1.15 2004/03/07 18:38:38 hsu Exp $
39 #include "opt_ipsec.h"
40 #include "opt_inet6.h"
42 #include <sys/param.h>
43 #include <sys/systm.h>
44 #include <sys/kernel.h>
45 #include <sys/malloc.h>
47 #include <sys/domain.h>
49 #include <sys/protosw.h>
50 #include <sys/socket.h>
51 #include <sys/socketvar.h>
52 #include <sys/sysctl.h>
53 #include <sys/syslog.h>
54 #include <sys/in_cksum.h>
56 #include <vm/vm_zone.h>
59 #include <net/route.h>
61 #include <netinet/in.h>
62 #include <netinet/in_systm.h>
63 #include <netinet/ip.h>
65 #include <netinet/ip6.h>
67 #include <netinet/in_pcb.h>
68 #include <netinet/in_var.h>
69 #include <netinet/ip_var.h>
71 #include <netinet6/ip6_var.h>
73 #include <netinet/ip_icmp.h>
74 #include <netinet/icmp_var.h>
75 #include <netinet/udp.h>
76 #include <netinet/udp_var.h>
79 #include <netipsec/ipsec.h>
83 #include <netinet6/ipsec.h>
87 * UDP protocol implementation.
88 * Per RFC 768, August, 1980.
91 static int udpcksum = 1;
93 static int udpcksum = 0; /* XXX */
95 SYSCTL_INT(_net_inet_udp, UDPCTL_CHECKSUM, checksum, CTLFLAG_RW,
99 SYSCTL_INT(_net_inet_udp, OID_AUTO, log_in_vain, CTLFLAG_RW,
100 &log_in_vain, 0, "Log all incoming UDP packets");
102 static int blackhole = 0;
103 SYSCTL_INT(_net_inet_udp, OID_AUTO, blackhole, CTLFLAG_RW,
104 &blackhole, 0, "Do not send port unreachables for refused connects");
106 static int strict_mcast_mship = 1;
107 SYSCTL_INT(_net_inet_udp, OID_AUTO, strict_mcast_mship, CTLFLAG_RW,
108 &strict_mcast_mship, 0, "Only send multicast to member sockets");
110 struct inpcbinfo udbinfo;
113 #define UDBHASHSIZE 16
116 struct udpstat udpstat; /* from udp_var.h */
117 SYSCTL_STRUCT(_net_inet_udp, UDPCTL_STATS, stats, CTLFLAG_RW,
118 &udpstat, udpstat, "UDP statistics (struct udpstat, netinet/udp_var.h)");
120 static struct sockaddr_in udp_in = { sizeof(udp_in), AF_INET };
123 struct sockaddr_in6 uin6_sin;
124 u_char uin6_init_done : 1;
126 { sizeof(udp_in6.uin6_sin), AF_INET6 },
130 struct ip6_hdr uip6_ip6;
131 u_char uip6_init_done : 1;
135 static void udp_append (struct inpcb *last, struct ip *ip,
136 struct mbuf *n, int off);
138 static void ip_2_ip6_hdr (struct ip6_hdr *ip6, struct ip *ip);
141 static int udp_detach (struct socket *so);
142 static int udp_output (struct inpcb *, struct mbuf *, struct sockaddr *,
143 struct mbuf *, struct thread *);
148 LIST_INIT(&udbinfo.listhead);
149 udbinfo.hashbase = hashinit(UDBHASHSIZE, M_PCB, &udbinfo.hashmask);
150 udbinfo.porthashbase = hashinit(UDBHASHSIZE, M_PCB,
151 &udbinfo.porthashmask);
152 udbinfo.bindhashbase = hashinit(UDBHASHSIZE, M_PCB,
153 &udbinfo.bindhashmask);
154 udbinfo.ipi_zone = zinit("udpcb", sizeof(struct inpcb), maxsockets,
160 * Check multicast packets to make sure they are only sent to sockets with
161 * multicast memberships for the packet's destination address and arrival
162 * interface. Multicast packets to multicast-unaware sockets are also
165 * Returns 0 if the packet is acceptable, -1 if it is not.
169 check_multicast_membership(struct ip *ip, struct inpcb *inp, struct mbuf *m)
172 struct ip_moptions *mopt;
174 if (strict_mcast_mship == 0 ||
175 !IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
178 mopt = inp->inp_moptions;
181 for (mshipno = 0; mshipno <= mopt->imo_num_memberships; ++mshipno) {
182 if (ip->ip_dst.s_addr == mopt->imo_membership[mshipno]->inm_addr.s_addr &&
183 m->m_pkthdr.rcvif == mopt->imo_membership[mshipno]->inm_ifp) {
191 udp_input(m, off, proto)
199 struct mbuf *opts = 0;
202 struct sockaddr *append_sa;
204 udpstat.udps_ipackets++;
207 * Strip IP options, if any; should skip this,
208 * make available to user, and use on returned packets,
209 * but we don't yet have a way to check the checksum
210 * with options still present.
212 if (iphlen > sizeof (struct ip)) {
214 iphlen = sizeof(struct ip);
218 * Get IP and UDP header together in first mbuf.
220 ip = mtod(m, struct ip *);
221 if (m->m_len < iphlen + sizeof(struct udphdr)) {
222 if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == 0) {
223 udpstat.udps_hdrops++;
226 ip = mtod(m, struct ip *);
228 uh = (struct udphdr *)((caddr_t)ip + iphlen);
230 /* destination port of 0 is illegal, based on RFC768. */
231 if (uh->uh_dport == 0)
235 * Make mbuf data length reflect UDP length.
236 * If not enough data to reflect UDP length, drop.
238 len = ntohs((u_short)uh->uh_ulen);
239 if (ip->ip_len != len) {
240 if (len > ip->ip_len || len < sizeof(struct udphdr)) {
241 udpstat.udps_badlen++;
244 m_adj(m, len - ip->ip_len);
245 /* ip->ip_len = len; */
248 * Save a copy of the IP header in case we want restore it
249 * for sending an ICMP error message in response.
254 * Checksum extended UDP header and data.
257 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) {
258 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR)
259 uh->uh_sum = m->m_pkthdr.csum_data;
261 uh->uh_sum = in_pseudo(ip->ip_src.s_addr,
262 ip->ip_dst.s_addr, htonl((u_short)len +
263 m->m_pkthdr.csum_data + IPPROTO_UDP));
264 uh->uh_sum ^= 0xffff;
267 bcopy(((struct ipovly *)ip)->ih_x1, b, 9);
268 bzero(((struct ipovly *)ip)->ih_x1, 9);
269 ((struct ipovly *)ip)->ih_len = uh->uh_ulen;
270 uh->uh_sum = in_cksum(m, len + sizeof (struct ip));
271 bcopy(b, ((struct ipovly *)ip)->ih_x1, 9);
274 udpstat.udps_badsum++;
279 udpstat.udps_nosum++;
281 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) ||
282 in_broadcast(ip->ip_dst, m->m_pkthdr.rcvif)) {
285 * Deliver a multicast or broadcast datagram to *all* sockets
286 * for which the local and remote addresses and ports match
287 * those of the incoming datagram. This allows more than
288 * one process to receive multi/broadcasts on the same port.
289 * (This really ought to be done for unicast datagrams as
290 * well, but that would cause problems with existing
291 * applications that open both address-specific sockets and
292 * a wildcard socket listening to the same port -- they would
293 * end up receiving duplicates of every unicast datagram.
294 * Those applications open the multiple sockets to overcome an
295 * inadequacy of the UDP socket interface, but for backwards
296 * compatibility we avoid the problem here rather than
297 * fixing the interface. Maybe 4.5BSD will remedy this?)
301 * Construct sockaddr format source address.
303 udp_in.sin_port = uh->uh_sport;
304 udp_in.sin_addr = ip->ip_src;
306 * Locate pcb(s) for datagram.
307 * (Algorithm copied from raw_intr().)
311 udp_in6.uin6_init_done = udp_ip6.uip6_init_done = 0;
313 LIST_FOREACH(inp, &udbinfo.listhead, inp_list) {
315 if ((inp->inp_vflag & INP_IPV4) == 0)
318 if (inp->inp_lport != uh->uh_dport)
320 if (inp->inp_laddr.s_addr != INADDR_ANY) {
321 if (inp->inp_laddr.s_addr !=
325 if (inp->inp_faddr.s_addr != INADDR_ANY) {
326 if (inp->inp_faddr.s_addr !=
328 inp->inp_fport != uh->uh_sport)
332 if (check_multicast_membership(ip, inp, m) < 0)
339 /* check AH/ESP integrity. */
340 if (ipsec4_in_reject_so(m, last->inp_socket))
341 ipsecstat.in_polvio++;
342 /* do not inject data to pcb */
346 /* check AH/ESP integrity. */
347 if (ipsec4_in_reject(m, last))
350 #endif /*FAST_IPSEC*/
351 if ((n = m_copy(m, 0, M_COPYALL)) != NULL)
352 udp_append(last, ip, n,
354 sizeof(struct udphdr));
358 * Don't look for additional matches if this one does
359 * not have either the SO_REUSEPORT or SO_REUSEADDR
360 * socket options set. This heuristic avoids searching
361 * through all pcbs in the common case of a non-shared
362 * port. It * assumes that an application will never
363 * clear these options after setting them.
365 if ((last->inp_socket->so_options&(SO_REUSEPORT|SO_REUSEADDR)) == 0)
371 * No matching pcb found; discard datagram.
372 * (No need to send an ICMP Port Unreachable
373 * for a broadcast or multicast datgram.)
375 udpstat.udps_noportbcast++;
379 /* check AH/ESP integrity. */
380 if (ipsec4_in_reject_so(m, last->inp_socket)) {
381 ipsecstat.in_polvio++;
386 /* check AH/ESP integrity. */
387 if (ipsec4_in_reject(m, last))
389 #endif /*FAST_IPSEC*/
390 udp_append(last, ip, m, iphlen + sizeof(struct udphdr));
394 * Locate pcb for datagram.
396 inp = in_pcblookup_hash(&udbinfo, ip->ip_src, uh->uh_sport,
397 ip->ip_dst, uh->uh_dport, 1, m->m_pkthdr.rcvif);
400 char buf[4*sizeof "123"];
402 strcpy(buf, inet_ntoa(ip->ip_dst));
404 "Connection attempt to UDP %s:%d from %s:%d\n",
405 buf, ntohs(uh->uh_dport), inet_ntoa(ip->ip_src),
406 ntohs(uh->uh_sport));
408 udpstat.udps_noport++;
409 if (m->m_flags & (M_BCAST | M_MCAST)) {
410 udpstat.udps_noportbcast++;
416 if (badport_bandlim(BANDLIM_ICMP_UNREACH) < 0)
420 ip->ip_len += iphlen;
421 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
425 if (ipsec4_in_reject_so(m, inp->inp_socket)) {
426 ipsecstat.in_polvio++;
431 if (ipsec4_in_reject(m, inp))
433 #endif /*FAST_IPSEC*/
436 * Construct sockaddr format source address.
437 * Stuff source address and datagram in user buffer.
439 udp_in.sin_port = uh->uh_sport;
440 udp_in.sin_addr = ip->ip_src;
441 if (inp->inp_flags & INP_CONTROLOPTS
442 || inp->inp_socket->so_options & SO_TIMESTAMP) {
444 if (inp->inp_vflag & INP_IPV6) {
447 ip_2_ip6_hdr(&udp_ip6.uip6_ip6, ip);
448 savedflags = inp->inp_flags;
449 inp->inp_flags &= ~INP_UNMAPPABLEOPTS;
450 ip6_savecontrol(inp, &opts, &udp_ip6.uip6_ip6, m);
451 inp->inp_flags = savedflags;
454 ip_savecontrol(inp, &opts, ip, m);
456 m_adj(m, iphlen + sizeof(struct udphdr));
458 if (inp->inp_vflag & INP_IPV6) {
459 in6_sin_2_v4mapsin6(&udp_in, &udp_in6.uin6_sin);
460 append_sa = (struct sockaddr *)&udp_in6;
463 append_sa = (struct sockaddr *)&udp_in;
464 if (sbappendaddr(&inp->inp_socket->so_rcv, append_sa, m, opts) == 0) {
465 udpstat.udps_fullsock++;
468 sorwakeup(inp->inp_socket);
479 ip_2_ip6_hdr(ip6, ip)
483 bzero(ip6, sizeof(*ip6));
485 ip6->ip6_vfc = IPV6_VERSION;
486 ip6->ip6_plen = ip->ip_len;
487 ip6->ip6_nxt = ip->ip_p;
488 ip6->ip6_hlim = ip->ip_ttl;
489 ip6->ip6_src.s6_addr32[2] = ip6->ip6_dst.s6_addr32[2] =
491 ip6->ip6_src.s6_addr32[3] = ip->ip_src.s_addr;
492 ip6->ip6_dst.s6_addr32[3] = ip->ip_dst.s_addr;
497 * subroutine of udp_input(), mainly for source code readability.
498 * caller must properly init udp_ip6 and udp_in6 beforehand.
501 udp_append(last, ip, n, off)
507 struct sockaddr *append_sa;
508 struct mbuf *opts = 0;
510 if (last->inp_flags & INP_CONTROLOPTS ||
511 last->inp_socket->so_options & SO_TIMESTAMP) {
513 if (last->inp_vflag & INP_IPV6) {
516 if (udp_ip6.uip6_init_done == 0) {
517 ip_2_ip6_hdr(&udp_ip6.uip6_ip6, ip);
518 udp_ip6.uip6_init_done = 1;
520 savedflags = last->inp_flags;
521 last->inp_flags &= ~INP_UNMAPPABLEOPTS;
522 ip6_savecontrol(last, &opts, &udp_ip6.uip6_ip6, n);
523 last->inp_flags = savedflags;
526 ip_savecontrol(last, &opts, ip, n);
529 if (last->inp_vflag & INP_IPV6) {
530 if (udp_in6.uin6_init_done == 0) {
531 in6_sin_2_v4mapsin6(&udp_in, &udp_in6.uin6_sin);
532 udp_in6.uin6_init_done = 1;
534 append_sa = (struct sockaddr *)&udp_in6.uin6_sin;
537 append_sa = (struct sockaddr *)&udp_in;
539 if (sbappendaddr(&last->inp_socket->so_rcv, append_sa, n, opts) == 0) {
543 udpstat.udps_fullsock++;
545 sorwakeup(last->inp_socket);
549 * Notify a udp user of an asynchronous error;
550 * just wake up so that he can collect error status.
553 udp_notify(inp, errno)
557 inp->inp_socket->so_error = errno;
558 sorwakeup(inp->inp_socket);
559 sowwakeup(inp->inp_socket);
563 udp_ctlinput(cmd, sa, vip)
570 void (*notify) (struct inpcb *, int) = udp_notify;
571 struct in_addr faddr;
575 faddr = ((struct sockaddr_in *)sa)->sin_addr;
576 if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY)
579 if (PRC_IS_REDIRECT(cmd)) {
581 notify = in_rtchange;
582 } else if (cmd == PRC_HOSTDEAD)
584 else if ((unsigned)cmd >= PRC_NCMDS || inetctlerrmap[cmd] == 0)
588 uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
589 inp = in_pcblookup_hash(&udbinfo, faddr, uh->uh_dport,
590 ip->ip_src, uh->uh_sport, 0, NULL);
591 if (inp != NULL && inp->inp_socket != NULL)
592 (*notify)(inp, inetctlerrmap[cmd]);
595 in_pcbnotifyall(&udbinfo.listhead, faddr, inetctlerrmap[cmd],
600 udp_pcblist(SYSCTL_HANDLER_ARGS)
603 struct inpcb *inp, **inp_list;
608 * The process of preparing the TCB list is too time-consuming and
609 * resource-intensive to repeat twice on every request.
611 if (req->oldptr == 0) {
612 n = udbinfo.ipi_count;
613 req->oldidx = 2 * (sizeof xig)
614 + (n + n/8) * sizeof(struct xinpcb);
618 if (req->newptr != 0)
622 * OK, now we're committed to doing something.
625 gencnt = udbinfo.ipi_gencnt;
626 n = udbinfo.ipi_count;
629 xig.xig_len = sizeof xig;
631 xig.xig_gen = gencnt;
632 xig.xig_sogen = so_gencnt;
633 error = SYSCTL_OUT(req, &xig, sizeof xig);
637 inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK);
642 for (inp = LIST_FIRST(&udbinfo.listhead), i = 0; inp && i < n;
643 inp = LIST_NEXT(inp, inp_list)) {
644 if (inp->inp_gencnt <= gencnt && !prison_xinpcb(req->td, inp))
651 for (i = 0; i < n; i++) {
653 if (inp->inp_gencnt <= gencnt) {
655 xi.xi_len = sizeof xi;
656 /* XXX should avoid extra copy */
657 bcopy(inp, &xi.xi_inp, sizeof *inp);
659 sotoxsocket(inp->inp_socket, &xi.xi_socket);
660 error = SYSCTL_OUT(req, &xi, sizeof xi);
665 * Give the user an updated idea of our state.
666 * If the generation differs from what we told
667 * her before, she knows that something happened
668 * while we were processing this request, and it
669 * might be necessary to retry.
672 xig.xig_gen = udbinfo.ipi_gencnt;
673 xig.xig_sogen = so_gencnt;
674 xig.xig_count = udbinfo.ipi_count;
676 error = SYSCTL_OUT(req, &xig, sizeof xig);
678 free(inp_list, M_TEMP);
682 SYSCTL_PROC(_net_inet_udp, UDPCTL_PCBLIST, pcblist, CTLFLAG_RD, 0, 0,
683 udp_pcblist, "S,xinpcb", "List of active UDP sockets");
686 udp_getcred(SYSCTL_HANDLER_ARGS)
688 struct sockaddr_in addrs[2];
692 error = suser(req->td);
695 error = SYSCTL_IN(req, addrs, sizeof(addrs));
699 inp = in_pcblookup_hash(&udbinfo, addrs[1].sin_addr, addrs[1].sin_port,
700 addrs[0].sin_addr, addrs[0].sin_port, 1, NULL);
701 if (inp == NULL || inp->inp_socket == NULL) {
705 error = SYSCTL_OUT(req, inp->inp_socket->so_cred, sizeof(struct ucred));
711 SYSCTL_PROC(_net_inet_udp, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW,
712 0, 0, udp_getcred, "S,ucred", "Get the ucred of a UDP connection");
715 udp_output(inp, m, dstaddr, control, td)
718 struct sockaddr *dstaddr;
719 struct mbuf *control;
723 int len = m->m_pkthdr.len;
724 struct sockaddr_in *sin; /* really is initialized before use */
728 m_freem(control); /* XXX */
730 if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) {
735 if (inp->inp_lport == 0) { /* unbound socket */
736 error = in_pcbbind(inp, (struct sockaddr *)NULL, td);
741 if (dstaddr != NULL) { /* destination address specified */
742 if (inp->inp_faddr.s_addr != INADDR_ANY) {
743 /* already connected */
747 sin = (struct sockaddr_in *)dstaddr;
748 prison_remote_ip(td, 0, &sin->sin_addr.s_addr);
750 if (inp->inp_faddr.s_addr == INADDR_ANY) {
751 /* no destination specified and not already connected */
758 * Calculate data length and get a mbuf
759 * for UDP and IP headers.
761 M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT);
768 * Fill in mbuf with extended UDP header
769 * and addresses and length put into network format.
771 ui = mtod(m, struct udpiphdr *);
772 bzero(ui->ui_x1, sizeof(ui->ui_x1)); /* XXX still needed? */
773 ui->ui_pr = IPPROTO_UDP;
776 * Set destination address.
778 if (dstaddr != NULL) { /* use specified destination */
779 ui->ui_dst = sin->sin_addr;
780 ui->ui_dport = sin->sin_port;
781 } else { /* use connected destination */
782 ui->ui_dst = inp->inp_faddr;
783 ui->ui_dport = inp->inp_fport;
787 * Set source address.
789 if (inp->inp_laddr.s_addr == INADDR_ANY) { /* need to pick an address */
790 struct sockaddr_in *if_sin;
792 error = in_pcbladdr(inp, dstaddr, &if_sin);
795 ui->ui_src = if_sin->sin_addr;
796 } else { /* use bound non-null address */
797 ui->ui_src = inp->inp_laddr;
799 ui->ui_sport = inp->inp_lport;
800 KASSERT(inp->inp_lport != 0, ("inp lport should have been bound"));
802 ui->ui_ulen = htons((u_short)len + sizeof(struct udphdr));
805 * Set up checksum and output datagram.
808 ui->ui_sum = in_pseudo(ui->ui_src.s_addr, ui->ui_dst.s_addr,
809 htons((u_short)len + sizeof(struct udphdr) + IPPROTO_UDP));
810 m->m_pkthdr.csum_flags = CSUM_UDP;
811 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
815 ((struct ip *)ui)->ip_len = sizeof (struct udpiphdr) + len;
816 ((struct ip *)ui)->ip_ttl = inp->inp_ip_ttl; /* XXX */
817 ((struct ip *)ui)->ip_tos = inp->inp_ip_tos; /* XXX */
818 udpstat.udps_opackets++;
820 error = ip_output(m, inp->inp_options, &inp->inp_route,
821 (inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST)),
822 inp->inp_moptions, inp);
831 u_long udp_sendspace = 9216; /* really max datagram size */
832 /* 40 1K datagrams */
833 SYSCTL_INT(_net_inet_udp, UDPCTL_MAXDGRAM, maxdgram, CTLFLAG_RW,
834 &udp_sendspace, 0, "Maximum outgoing UDP datagram size");
836 u_long udp_recvspace = 40 * (1024 +
838 sizeof(struct sockaddr_in6)
840 sizeof(struct sockaddr_in)
843 SYSCTL_INT(_net_inet_udp, UDPCTL_RECVSPACE, recvspace, CTLFLAG_RW,
844 &udp_recvspace, 0, "Maximum incoming UDP datagram size");
847 udp_abort(struct socket *so)
854 return EINVAL; /* ??? possible? panic instead? */
855 soisdisconnected(so);
863 udp_attach(struct socket *so, int proto, struct pru_attach_info *ai)
872 error = soreserve(so, udp_sendspace, udp_recvspace, ai->sb_rlimit);
876 error = in_pcballoc(so, &udbinfo);
881 inp = (struct inpcb *)so->so_pcb;
882 inp->inp_vflag |= INP_IPV4;
883 inp->inp_ip_ttl = ip_defttl;
888 udp_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
897 error = in_pcbbind(inp, nam, td);
903 udp_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
907 struct sockaddr_in *sin;
912 if (inp->inp_faddr.s_addr != INADDR_ANY)
916 if (inp->inp_laddr.s_addr == INADDR_ANY &&
918 td->td_proc->p_ucred->cr_prison != NULL) {
919 error = in_pcbbind(inp, NULL, td);
922 sin = (struct sockaddr_in *)nam;
923 prison_remote_ip(td, 0, &sin->sin_addr.s_addr);
924 error = in_pcbconnect(inp, nam, td);
933 udp_detach(struct socket *so)
948 udp_disconnect(struct socket *so)
956 if (inp->inp_faddr.s_addr == INADDR_ANY)
960 in_pcbdisconnect(inp);
961 inp->inp_laddr.s_addr = INADDR_ANY;
962 in_pcbinsbindhash(inp);
964 so->so_state &= ~SS_ISCONNECTED; /* XXX */
969 udp_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
970 struct mbuf *control, struct thread *td)
979 return udp_output(inp, m, addr, control, td);
983 udp_shutdown(struct socket *so)
994 struct pr_usrreqs udp_usrreqs = {
995 udp_abort, pru_accept_notsupp, udp_attach, udp_bind, udp_connect,
996 pru_connect2_notsupp, in_control, udp_detach, udp_disconnect,
997 pru_listen_notsupp, in_setpeeraddr, pru_rcvd_notsupp,
998 pru_rcvoob_notsupp, udp_send, pru_sense_null, udp_shutdown,
999 in_setsockaddr, sosend, soreceive, sopoll