Annotation of src/sys/netinet/udp_usrreq.c, Revision 1.26
1.26 ! mycroft 1: /* $NetBSD: udp_usrreq.c,v 1.25 1995/11/21 01:07:46 cgd Exp $ */
1.14 cgd 2:
1.1 cgd 3: /*
1.13 mycroft 4: * Copyright (c) 1982, 1986, 1988, 1990, 1993
5: * The Regents of the University of California. All rights reserved.
1.1 cgd 6: *
7: * Redistribution and use in source and binary forms, with or without
8: * modification, are permitted provided that the following conditions
9: * are met:
10: * 1. Redistributions of source code must retain the above copyright
11: * notice, this list of conditions and the following disclaimer.
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in the
14: * documentation and/or other materials provided with the distribution.
15: * 3. All advertising materials mentioning features or use of this software
16: * must display the following acknowledgement:
17: * This product includes software developed by the University of
18: * California, Berkeley and its contributors.
19: * 4. Neither the name of the University nor the names of its contributors
20: * may be used to endorse or promote products derived from this software
21: * without specific prior written permission.
22: *
23: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33: * SUCH DAMAGE.
34: *
1.14 cgd 35: * @(#)udp_usrreq.c 8.4 (Berkeley) 1/21/94
1.1 cgd 36: */
37:
1.5 mycroft 38: #include <sys/param.h>
39: #include <sys/malloc.h>
40: #include <sys/mbuf.h>
41: #include <sys/protosw.h>
42: #include <sys/socket.h>
43: #include <sys/socketvar.h>
1.13 mycroft 44: #include <sys/errno.h>
1.5 mycroft 45: #include <sys/stat.h>
1.1 cgd 46:
1.5 mycroft 47: #include <net/if.h>
48: #include <net/route.h>
1.1 cgd 49:
1.5 mycroft 50: #include <netinet/in.h>
51: #include <netinet/in_systm.h>
1.15 cgd 52: #include <netinet/in_var.h>
1.5 mycroft 53: #include <netinet/ip.h>
54: #include <netinet/in_pcb.h>
55: #include <netinet/ip_var.h>
56: #include <netinet/ip_icmp.h>
57: #include <netinet/udp.h>
58: #include <netinet/udp_var.h>
1.1 cgd 59:
1.8 mycroft 60: /*
61: * UDP protocol implementation.
62: * Per RFC 768, August, 1980.
63: */
64: #ifndef COMPAT_42
65: int udpcksum = 1;
66: #else
67: int udpcksum = 0; /* XXX */
68: #endif
69:
70: struct sockaddr_in udp_in = { sizeof(udp_in), AF_INET };
1.1 cgd 71:
1.13 mycroft 72: static void udp_detach __P((struct inpcb *));
73: static void udp_notify __P((struct inpcb *, int));
74: static struct mbuf *udp_saveopt __P((caddr_t, int, int));
1.7 mycroft 75:
1.26 ! mycroft 76: #ifndef UDBHASHSIZE
! 77: #define UDBHASHSIZE 128
! 78: #endif
! 79: int udbhashsize = UDBHASHSIZE;
! 80:
1.7 mycroft 81: void
1.1 cgd 82: udp_init()
83: {
1.18 mycroft 84:
1.26 ! mycroft 85: in_pcbinit(&udbtable, udbhashsize);
1.1 cgd 86: }
87:
1.7 mycroft 88: void
1.1 cgd 89: udp_input(m, iphlen)
90: register struct mbuf *m;
91: int iphlen;
92: {
93: register struct ip *ip;
94: register struct udphdr *uh;
95: register struct inpcb *inp;
96: struct mbuf *opts = 0;
97: int len;
98: struct ip save_ip;
99:
100: udpstat.udps_ipackets++;
101:
102: /*
103: * Strip IP options, if any; should skip this,
104: * make available to user, and use on returned packets,
105: * but we don't yet have a way to check the checksum
106: * with options still present.
107: */
108: if (iphlen > sizeof (struct ip)) {
109: ip_stripoptions(m, (struct mbuf *)0);
110: iphlen = sizeof(struct ip);
111: }
112:
113: /*
114: * Get IP and UDP header together in first mbuf.
115: */
116: ip = mtod(m, struct ip *);
117: if (m->m_len < iphlen + sizeof(struct udphdr)) {
118: if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == 0) {
119: udpstat.udps_hdrops++;
120: return;
121: }
122: ip = mtod(m, struct ip *);
123: }
124: uh = (struct udphdr *)((caddr_t)ip + iphlen);
125:
126: /*
127: * Make mbuf data length reflect UDP length.
128: * If not enough data to reflect UDP length, drop.
129: */
1.15 cgd 130: len = ntohs((u_int16_t)uh->uh_ulen);
1.1 cgd 131: if (ip->ip_len != len) {
132: if (len > ip->ip_len) {
133: udpstat.udps_badlen++;
134: goto bad;
135: }
136: m_adj(m, len - ip->ip_len);
137: /* ip->ip_len = len; */
138: }
139: /*
140: * Save a copy of the IP header in case we want restore it
141: * for sending an ICMP error message in response.
142: */
143: save_ip = *ip;
144:
145: /*
146: * Checksum extended UDP header and data.
147: */
148: if (udpcksum && uh->uh_sum) {
1.25 cgd 149: bzero(((struct ipovly *)ip)->ih_x1,
150: sizeof ((struct ipovly *)ip)->ih_x1);
1.1 cgd 151: ((struct ipovly *)ip)->ih_len = uh->uh_ulen;
152: if (uh->uh_sum = in_cksum(m, len + sizeof (struct ip))) {
153: udpstat.udps_badsum++;
154: m_freem(m);
155: return;
156: }
157: }
1.13 mycroft 158:
1.16 mycroft 159: if (IN_MULTICAST(ip->ip_dst.s_addr) ||
1.13 mycroft 160: in_broadcast(ip->ip_dst, m->m_pkthdr.rcvif)) {
1.4 hpeyerl 161: struct socket *last;
162: /*
163: * Deliver a multicast or broadcast datagram to *all* sockets
164: * for which the local and remote addresses and ports match
165: * those of the incoming datagram. This allows more than
166: * one process to receive multi/broadcasts on the same port.
167: * (This really ought to be done for unicast datagrams as
168: * well, but that would cause problems with existing
169: * applications that open both address-specific sockets and
170: * a wildcard socket listening to the same port -- they would
171: * end up receiving duplicates of every unicast datagram.
172: * Those applications open the multiple sockets to overcome an
173: * inadequacy of the UDP socket interface, but for backwards
174: * compatibility we avoid the problem here rather than
1.13 mycroft 175: * fixing the interface. Maybe 4.5BSD will remedy this?)
1.4 hpeyerl 176: */
1.13 mycroft 177:
1.4 hpeyerl 178: /*
179: * Construct sockaddr format source address.
180: */
181: udp_in.sin_port = uh->uh_sport;
182: udp_in.sin_addr = ip->ip_src;
183: m->m_len -= sizeof (struct udpiphdr);
184: m->m_data += sizeof (struct udpiphdr);
185: /*
186: * Locate pcb(s) for datagram.
187: * (Algorithm copied from raw_intr().)
188: */
189: last = NULL;
1.22 cgd 190: for (inp = udbtable.inpt_queue.cqh_first;
191: inp != (struct inpcb *)&udbtable.inpt_queue;
192: inp = inp->inp_queue.cqe_next) {
1.4 hpeyerl 193: if (inp->inp_lport != uh->uh_dport)
194: continue;
195: if (inp->inp_laddr.s_addr != INADDR_ANY) {
196: if (inp->inp_laddr.s_addr !=
197: ip->ip_dst.s_addr)
198: continue;
199: }
200: if (inp->inp_faddr.s_addr != INADDR_ANY) {
1.6 mycroft 201: if (inp->inp_faddr.s_addr !=
1.4 hpeyerl 202: ip->ip_src.s_addr ||
203: inp->inp_fport != uh->uh_sport)
204: continue;
205: }
206:
207: if (last != NULL) {
208: struct mbuf *n;
209:
210: if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
211: if (sbappendaddr(&last->so_rcv,
1.17 mycroft 212: sintosa(&udp_in), n,
213: (struct mbuf *)0) == 0) {
1.4 hpeyerl 214: m_freem(n);
1.13 mycroft 215: udpstat.udps_fullsock++;
216: } else
1.4 hpeyerl 217: sorwakeup(last);
218: }
219: }
220: last = inp->inp_socket;
221: /*
1.13 mycroft 222: * Don't look for additional matches if this one does
223: * not have either the SO_REUSEPORT or SO_REUSEADDR
224: * socket options set. This heuristic avoids searching
225: * through all pcbs in the common case of a non-shared
226: * port. It * assumes that an application will never
227: * clear these options after setting them.
1.4 hpeyerl 228: */
1.13 mycroft 229: if ((last->so_options&(SO_REUSEPORT|SO_REUSEADDR) == 0))
1.4 hpeyerl 230: break;
231: }
1.6 mycroft 232:
1.4 hpeyerl 233: if (last == NULL) {
234: /*
235: * No matching pcb found; discard datagram.
236: * (No need to send an ICMP Port Unreachable
237: * for a broadcast or multicast datgram.)
238: */
1.13 mycroft 239: udpstat.udps_noportbcast++;
1.4 hpeyerl 240: goto bad;
241: }
1.17 mycroft 242: if (sbappendaddr(&last->so_rcv, sintosa(&udp_in), m,
243: (struct mbuf *)0) == 0) {
1.13 mycroft 244: udpstat.udps_fullsock++;
1.4 hpeyerl 245: goto bad;
1.13 mycroft 246: }
1.4 hpeyerl 247: sorwakeup(last);
248: return;
249: }
1.1 cgd 250: /*
251: * Locate pcb for datagram.
252: */
1.26 ! mycroft 253: inp = in_pcbhashlookup(&udbtable, ip->ip_src, uh->uh_sport,
! 254: ip->ip_dst, uh->uh_dport);
! 255: if (inp == 0) {
! 256: ++udpstat.udps_pcbhashmiss;
1.18 mycroft 257: inp = in_pcblookup(&udbtable, ip->ip_src, uh->uh_sport,
1.1 cgd 258: ip->ip_dst, uh->uh_dport, INPLOOKUP_WILDCARD);
1.18 mycroft 259: if (inp == 0) {
260: udpstat.udps_noport++;
261: if (m->m_flags & (M_BCAST | M_MCAST)) {
262: udpstat.udps_noportbcast++;
263: goto bad;
264: }
265: *ip = save_ip;
266: ip->ip_len += iphlen;
267: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
268: return;
1.13 mycroft 269: }
1.1 cgd 270: }
271:
272: /*
273: * Construct sockaddr format source address.
274: * Stuff source address and datagram in user buffer.
275: */
276: udp_in.sin_port = uh->uh_sport;
277: udp_in.sin_addr = ip->ip_src;
278: if (inp->inp_flags & INP_CONTROLOPTS) {
279: struct mbuf **mp = &opts;
280:
281: if (inp->inp_flags & INP_RECVDSTADDR) {
282: *mp = udp_saveopt((caddr_t) &ip->ip_dst,
283: sizeof(struct in_addr), IP_RECVDSTADDR);
284: if (*mp)
285: mp = &(*mp)->m_next;
286: }
287: #ifdef notyet
288: /* options were tossed above */
289: if (inp->inp_flags & INP_RECVOPTS) {
290: *mp = udp_saveopt((caddr_t) opts_deleted_above,
291: sizeof(struct in_addr), IP_RECVOPTS);
292: if (*mp)
293: mp = &(*mp)->m_next;
294: }
295: /* ip_srcroute doesn't do what we want here, need to fix */
296: if (inp->inp_flags & INP_RECVRETOPTS) {
297: *mp = udp_saveopt((caddr_t) ip_srcroute(),
298: sizeof(struct in_addr), IP_RECVRETOPTS);
299: if (*mp)
300: mp = &(*mp)->m_next;
301: }
302: #endif
303: }
304: iphlen += sizeof(struct udphdr);
305: m->m_len -= iphlen;
306: m->m_pkthdr.len -= iphlen;
307: m->m_data += iphlen;
1.17 mycroft 308: if (sbappendaddr(&inp->inp_socket->so_rcv, sintosa(&udp_in), m,
309: opts) == 0) {
1.1 cgd 310: udpstat.udps_fullsock++;
311: goto bad;
312: }
313: sorwakeup(inp->inp_socket);
314: return;
315: bad:
316: m_freem(m);
317: if (opts)
318: m_freem(opts);
319: }
320:
321: /*
322: * Create a "control" mbuf containing the specified data
323: * with the specified type for presentation with a datagram.
324: */
1.13 mycroft 325: struct mbuf *
1.1 cgd 326: udp_saveopt(p, size, type)
327: caddr_t p;
328: register int size;
329: int type;
330: {
331: register struct cmsghdr *cp;
332: struct mbuf *m;
333:
334: if ((m = m_get(M_DONTWAIT, MT_CONTROL)) == NULL)
335: return ((struct mbuf *) NULL);
336: cp = (struct cmsghdr *) mtod(m, struct cmsghdr *);
1.13 mycroft 337: bcopy(p, CMSG_DATA(cp), size);
1.1 cgd 338: size += sizeof(*cp);
339: m->m_len = size;
340: cp->cmsg_len = size;
341: cp->cmsg_level = IPPROTO_IP;
342: cp->cmsg_type = type;
343: return (m);
344: }
345:
346: /*
347: * Notify a udp user of an asynchronous error;
348: * just wake up so that he can collect error status.
349: */
1.7 mycroft 350: static void
1.1 cgd 351: udp_notify(inp, errno)
352: register struct inpcb *inp;
1.7 mycroft 353: int errno;
1.1 cgd 354: {
355: inp->inp_socket->so_error = errno;
356: sorwakeup(inp->inp_socket);
357: sowwakeup(inp->inp_socket);
358: }
359:
1.7 mycroft 360: void
1.1 cgd 361: udp_ctlinput(cmd, sa, ip)
362: int cmd;
363: struct sockaddr *sa;
364: register struct ip *ip;
365: {
366: register struct udphdr *uh;
367: extern struct in_addr zeroin_addr;
1.21 mycroft 368: extern int inetctlerrmap[];
1.18 mycroft 369: void (*notify) __P((struct inpcb *, int)) = udp_notify;
1.21 mycroft 370: int errno;
1.1 cgd 371:
1.20 mycroft 372: if ((unsigned)cmd >= PRC_NCMDS)
373: return;
374: errno = inetctlerrmap[cmd];
1.18 mycroft 375: if (PRC_IS_REDIRECT(cmd))
1.19 mycroft 376: notify = in_rtchange, ip = 0;
1.18 mycroft 377: else if (cmd == PRC_HOSTDEAD)
1.19 mycroft 378: ip = 0;
1.23 cgd 379: else if (errno == 0)
1.1 cgd 380: return;
1.19 mycroft 381: if (ip) {
1.1 cgd 382: uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
1.18 mycroft 383: in_pcbnotify(&udbtable, sa, uh->uh_dport, ip->ip_src,
1.20 mycroft 384: uh->uh_sport, errno, notify);
1.19 mycroft 385: } else
1.20 mycroft 386: in_pcbnotifyall(&udbtable, sa, errno, notify);
1.1 cgd 387: }
388:
1.7 mycroft 389: int
1.1 cgd 390: udp_output(inp, m, addr, control)
391: register struct inpcb *inp;
392: register struct mbuf *m;
393: struct mbuf *addr, *control;
394: {
395: register struct udpiphdr *ui;
396: register int len = m->m_pkthdr.len;
397: struct in_addr laddr;
398: int s, error = 0;
399:
400: if (control)
401: m_freem(control); /* XXX */
402:
403: if (addr) {
404: laddr = inp->inp_laddr;
405: if (inp->inp_faddr.s_addr != INADDR_ANY) {
406: error = EISCONN;
407: goto release;
408: }
409: /*
410: * Must block input while temporarily connected.
411: */
1.24 mycroft 412: s = splsoftnet();
1.1 cgd 413: error = in_pcbconnect(inp, addr);
414: if (error) {
415: splx(s);
416: goto release;
417: }
418: } else {
419: if (inp->inp_faddr.s_addr == INADDR_ANY) {
420: error = ENOTCONN;
421: goto release;
422: }
423: }
424: /*
425: * Calculate data length and get a mbuf
426: * for UDP and IP headers.
427: */
1.13 mycroft 428: M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT);
429: if (m == 0) {
430: error = ENOBUFS;
431: goto release;
432: }
1.1 cgd 433:
434: /*
435: * Fill in mbuf with extended UDP header
436: * and addresses and length put into network format.
437: */
438: ui = mtod(m, struct udpiphdr *);
1.25 cgd 439: bzero(ui->ui_x1, sizeof ui->ui_x1);
1.1 cgd 440: ui->ui_pr = IPPROTO_UDP;
1.15 cgd 441: ui->ui_len = htons((u_int16_t)len + sizeof (struct udphdr));
1.1 cgd 442: ui->ui_src = inp->inp_laddr;
443: ui->ui_dst = inp->inp_faddr;
444: ui->ui_sport = inp->inp_lport;
445: ui->ui_dport = inp->inp_fport;
446: ui->ui_ulen = ui->ui_len;
447:
448: /*
449: * Stuff checksum and output datagram.
450: */
451: ui->ui_sum = 0;
452: if (udpcksum) {
453: if ((ui->ui_sum = in_cksum(m, sizeof (struct udpiphdr) + len)) == 0)
454: ui->ui_sum = 0xffff;
455: }
456: ((struct ip *)ui)->ip_len = sizeof (struct udpiphdr) + len;
457: ((struct ip *)ui)->ip_ttl = inp->inp_ip.ip_ttl; /* XXX */
458: ((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; /* XXX */
459: udpstat.udps_opackets++;
460: error = ip_output(m, inp->inp_options, &inp->inp_route,
1.12 mycroft 461: inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST),
462: inp->inp_moptions);
1.1 cgd 463:
464: if (addr) {
465: in_pcbdisconnect(inp);
466: inp->inp_laddr = laddr;
467: splx(s);
468: }
469: return (error);
470:
471: release:
472: m_freem(m);
473: return (error);
474: }
475:
476: u_long udp_sendspace = 9216; /* really max datagram size */
477: u_long udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in));
478: /* 40 1K datagrams */
479:
480: /*ARGSUSED*/
1.7 mycroft 481: int
1.1 cgd 482: udp_usrreq(so, req, m, addr, control)
483: struct socket *so;
484: int req;
485: struct mbuf *m, *addr, *control;
486: {
487: struct inpcb *inp = sotoinpcb(so);
488: int error = 0;
489: int s;
490:
491: if (req == PRU_CONTROL)
1.15 cgd 492: return (in_control(so, (long)m, (caddr_t)addr,
1.1 cgd 493: (struct ifnet *)control));
494: if (inp == NULL && req != PRU_ATTACH) {
495: error = EINVAL;
496: goto release;
497: }
498: /*
499: * Note: need to block udp_input while changing
500: * the udp pcb queue and/or pcb addresses.
501: */
502: switch (req) {
503:
504: case PRU_ATTACH:
505: if (inp != NULL) {
506: error = EINVAL;
507: break;
508: }
1.24 mycroft 509: s = splsoftnet();
1.18 mycroft 510: error = in_pcballoc(so, &udbtable);
1.1 cgd 511: splx(s);
512: if (error)
513: break;
514: error = soreserve(so, udp_sendspace, udp_recvspace);
515: if (error)
516: break;
1.13 mycroft 517: ((struct inpcb *) so->so_pcb)->inp_ip.ip_ttl = ip_defttl;
1.1 cgd 518: break;
519:
520: case PRU_DETACH:
521: udp_detach(inp);
522: break;
523:
524: case PRU_BIND:
1.24 mycroft 525: s = splsoftnet();
1.1 cgd 526: error = in_pcbbind(inp, addr);
527: splx(s);
528: break;
529:
530: case PRU_LISTEN:
531: error = EOPNOTSUPP;
532: break;
533:
534: case PRU_CONNECT:
535: if (inp->inp_faddr.s_addr != INADDR_ANY) {
536: error = EISCONN;
537: break;
538: }
1.24 mycroft 539: s = splsoftnet();
1.1 cgd 540: error = in_pcbconnect(inp, addr);
541: splx(s);
542: if (error == 0)
543: soisconnected(so);
544: break;
545:
546: case PRU_CONNECT2:
547: error = EOPNOTSUPP;
548: break;
549:
550: case PRU_ACCEPT:
551: error = EOPNOTSUPP;
552: break;
553:
554: case PRU_DISCONNECT:
555: if (inp->inp_faddr.s_addr == INADDR_ANY) {
556: error = ENOTCONN;
557: break;
558: }
1.24 mycroft 559: s = splsoftnet();
1.1 cgd 560: in_pcbdisconnect(inp);
561: inp->inp_laddr.s_addr = INADDR_ANY;
562: splx(s);
563: so->so_state &= ~SS_ISCONNECTED; /* XXX */
564: break;
565:
566: case PRU_SHUTDOWN:
567: socantsendmore(so);
568: break;
569:
570: case PRU_SEND:
571: return (udp_output(inp, m, addr, control));
572:
573: case PRU_ABORT:
574: soisdisconnected(so);
575: udp_detach(inp);
576: break;
577:
578: case PRU_SOCKADDR:
579: in_setsockaddr(inp, addr);
580: break;
581:
582: case PRU_PEERADDR:
583: in_setpeeraddr(inp, addr);
584: break;
585:
586: case PRU_SENSE:
587: /*
588: * stat: don't bother with a blocksize.
589: */
590: return (0);
591:
592: case PRU_SENDOOB:
593: case PRU_FASTTIMO:
594: case PRU_SLOWTIMO:
595: case PRU_PROTORCV:
596: case PRU_PROTOSEND:
597: error = EOPNOTSUPP;
598: break;
599:
600: case PRU_RCVD:
601: case PRU_RCVOOB:
602: return (EOPNOTSUPP); /* do not free mbuf's */
603:
604: default:
605: panic("udp_usrreq");
606: }
607:
608: release:
609: if (control) {
610: printf("udp control data unexpectedly retained\n");
611: m_freem(control);
612: }
613: if (m)
614: m_freem(m);
615: return (error);
616: }
617:
1.7 mycroft 618: static void
1.1 cgd 619: udp_detach(inp)
620: struct inpcb *inp;
621: {
1.24 mycroft 622: int s = splsoftnet();
1.1 cgd 623:
624: in_pcbdetach(inp);
625: splx(s);
1.13 mycroft 626: }
627:
628: /*
629: * Sysctl for udp variables.
630: */
631: udp_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
632: int *name;
633: u_int namelen;
634: void *oldp;
635: size_t *oldlenp;
636: void *newp;
637: size_t newlen;
638: {
639: /* All sysctl names at this level are terminal. */
640: if (namelen != 1)
641: return (ENOTDIR);
642:
643: switch (name[0]) {
644: case UDPCTL_CHECKSUM:
645: return (sysctl_int(oldp, oldlenp, newp, newlen, &udpcksum));
646: default:
647: return (ENOPROTOOPT);
648: }
649: /* NOTREACHED */
1.1 cgd 650: }
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