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1.1 root 1: /*
2: * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
3: *
4: * @APPLE_LICENSE_HEADER_START@
5: *
6: * Portions Copyright (c) 1999 Apple Computer, Inc. All Rights
7: * Reserved. This file contains Original Code and/or Modifications of
8: * Original Code as defined in and that are subject to the Apple Public
9: * Source License Version 1.1 (the "License"). You may not use this file
10: * except in compliance with the License. Please obtain a copy of the
11: * License at http://www.apple.com/publicsource and read it before using
12: * this file.
13: *
14: * The Original Code and all software distributed under the License are
15: * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
16: * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
17: * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
18: * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
19: * License for the specific language governing rights and limitations
20: * under the License.
21: *
22: * @APPLE_LICENSE_HEADER_END@
23: */
24:
25: /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
26: /*
27: * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995
28: * The Regents of the University of California. All rights reserved.
29: *
30: * Redistribution and use in source and binary forms, with or without
31: * modification, are permitted provided that the following conditions
32: * are met:
33: * 1. Redistributions of source code must retain the above copyright
34: * notice, this list of conditions and the following disclaimer.
35: * 2. Redistributions in binary form must reproduce the above copyright
36: * notice, this list of conditions and the following disclaimer in the
37: * documentation and/or other materials provided with the distribution.
38: * 3. All advertising materials mentioning features or use of this software
39: * must display the following acknowledgement:
40: * This product includes software developed by the University of
41: * California, Berkeley and its contributors.
42: * 4. Neither the name of the University nor the names of its contributors
43: * may be used to endorse or promote products derived from this software
44: * without specific prior written permission.
45: *
46: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
47: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
48: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
49: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
50: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
51: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
52: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
53: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
54: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
55: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
56: * SUCH DAMAGE.
57: *
58: * @(#)udp_usrreq.c 8.6 (Berkeley) 5/23/95
59: */
60:
61: #include <sys/param.h>
62: #include <sys/malloc.h>
63: #include <sys/mbuf.h>
64: #include <sys/protosw.h>
65: #include <sys/socket.h>
66: #include <sys/socketvar.h>
67: #include <sys/errno.h>
68: #include <sys/stat.h>
69:
70: #include <net/if.h>
71: #include <net/route.h>
72:
73: #include <kernserv/machine/spl.h>
74: #include <netinet/in.h>
75: #include <netinet/in_systm.h>
76: #include <netinet/ip.h>
77: #include <netinet/in_pcb.h>
78: #include <netinet/ip_var.h>
79: #include <netinet/ip_icmp.h>
80: #include <netinet/udp.h>
81: #include <netinet/udp_var.h>
82:
83: #if NEXT
84: #import <kern/kdebug.h>
85:
86: #if KDEBUG
87:
88: #define DBG_LAYER_IN_BEG NETDBG_CODE(DBG_NETUDP, 0)
89: #define DBG_LAYER_IN_END NETDBG_CODE(DBG_NETUDP, 2)
90: #define DBG_LAYER_OUT_BEG NETDBG_CODE(DBG_NETUDP, 1)
91: #define DBG_LAYER_OUT_END NETDBG_CODE(DBG_NETUDP, 3)
92: #define DBG_FNC_UDP_INPUT NETDBG_CODE(DBG_NETUDP, (5 << 8))
93: #define DBG_FNC_UDP_OUTPUT NETDBG_CODE(DBG_NETUDP, (6 << 8) | 1)
94:
95: #endif
96:
97: #endif
98:
99:
100: #define N_UDP_HASH_ELEMENTS (2 * 1024) /* must be power of 2 */
101: #define UDP_HASH_MASK (N_UDP_HASH_ELEMENTS - 1)
102: #define N_UDP_LPORT_HASH_ELEMENTS (1024)
103: #define UDP_LPORT_HASH_MASK (N_UDP_LPORT_HASH_ELEMENTS - 1)
104:
105:
106: /*
107: * UDP protocol implementation.
108: * Per RFC 768, August, 1980.
109: */
110: #ifndef COMPAT_42
111: int udpcksum = 1;
112: #else
113: int udpcksum = 0; /* XXX */
114: #endif
115:
116: struct sockaddr_in udp_in = { sizeof(udp_in), AF_INET };
117: struct inpcb udb;
118: struct udpstat udpstat;
119:
120: struct inpcb *udp_hash_array[N_UDP_HASH_ELEMENTS];
121: struct inpcb *udp_lport_hash_array[N_UDP_LPORT_HASH_ELEMENTS];
122:
123: struct inpcb_hash_str udp_hash_str =
124: {udp_hash_array, UDP_HASH_MASK, N_UDP_HASH_ELEMENTS};
125:
126: struct inpcb_hash_str udp_lport_hash_str =
127: {udp_lport_hash_array, UDP_LPORT_HASH_MASK, N_UDP_LPORT_HASH_ELEMENTS};
128:
129: static void udp_detach __P((struct inpcb *));
130: static void udp_notify __P((struct inpcb *, int));
131: static struct mbuf *udp_saveopt __P((caddr_t, int, int));
132: static struct mbuf *udp_savesockopt __P((caddr_t, int, int, int));
133:
134: #include <strings.h>
135:
136: static struct mbuf *
137: udp_insert_ifinfo(struct mbuf * m)
138: {
139: struct ifnet * ifp = m->m_pkthdr.rcvif;
140:
141: if (ifp) {
142: char buf[IFNAMSIZ * 2];
143: struct mbuf * mp;
144: int len;
145:
146: bzero(buf, sizeof(buf));
147: sprintf(buf, "%s%d", ifp->if_name, ifp->if_unit);
148: len = ALIGN(strlen(buf));
149: mp = udp_savesockopt((caddr_t)buf, len, SOL_SOCKET, SO_RCVIF);
150: return (mp);
151: }
152: return (NULL);
153: }
154:
155: void
156: udp_init()
157: {
158: int i;
159:
160: udb.inp_next = udb.inp_prev = &udb;
161:
162: for (i=0; i < N_UDP_HASH_ELEMENTS; i++)
163: udp_hash_array[i] = 0;
164:
165: for (i=0; i < N_UDP_LPORT_HASH_ELEMENTS; i++)
166: udp_lport_hash_array[i] = 0;
167: }
168:
169: void
170: udp_input(m, iphlen)
171: register struct mbuf *m;
172: int iphlen;
173: {
174: register struct ip *ip;
175: register struct udphdr *uh;
176: register struct inpcb *inp;
177: struct mbuf *opts = 0;
178: int len;
179: struct ip save_ip;
180:
181: udpstat.udps_ipackets++;
182:
183: KERNEL_DEBUG(DBG_FNC_UDP_INPUT | DBG_FUNC_START, 0,0,0,0,0);
184:
185: /*
186: * Strip IP options, if any; should skip this,
187: * make available to user, and use on returned packets,
188: * but we don't yet have a way to check the checksum
189: * with options still present.
190: */
191: if (iphlen > sizeof (struct ip)) {
192: ip_stripoptions(m, (struct mbuf *)0);
193: iphlen = sizeof(struct ip);
194: }
195:
196: /*
197: * Get IP and UDP header together in first mbuf.
198: */
199: ip = mtod(m, struct ip *);
200: if (m->m_len < iphlen + sizeof(struct udphdr)) {
201: if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == 0) {
202: udpstat.udps_hdrops++;
203: KERNEL_DEBUG(DBG_FNC_UDP_INPUT | DBG_FUNC_END, 0,0,0,0,0);
204: return;
205: }
206: ip = mtod(m, struct ip *);
207: }
208: uh = (struct udphdr *)((caddr_t)ip + iphlen);
209:
210: KERNEL_DEBUG(DBG_LAYER_IN_BEG, uh->uh_dport, uh->uh_sport,
211: ip->ip_src.s_addr, ip->ip_dst.s_addr, uh->uh_ulen);
212:
213: /*
214: * Make mbuf data length reflect UDP length.
215: * If not enough data to reflect UDP length, drop.
216: */
217: len = ntohs((u_short)uh->uh_ulen);
218: if (ip->ip_len != len) {
219: if (len > ip->ip_len) {
220: udpstat.udps_badlen++;
221: goto bad;
222: }
223: m_adj(m, len - ip->ip_len);
224: /* ip->ip_len = len; */
225: }
226: /*
227: * Save a copy of the IP header in case we want restore it
228: * for sending an ICMP error message in response.
229: */
230: save_ip = *ip;
231:
232: /*
233: * Checksum extended UDP header and data.
234: */
235: if (uh->uh_sum) {
236: ((struct ipovly *)ip)->ih_next = 0;
237: ((struct ipovly *)ip)->ih_prev = 0;
238: ((struct ipovly *)ip)->ih_x1 = 0;
239: ((struct ipovly *)ip)->ih_len = uh->uh_ulen;
240: if ((uh->uh_sum = in_cksum(m, len + sizeof (struct ip)))) {
241: udpstat.udps_badsum++;
242: m_freem(m);
243: KERNEL_DEBUG(DBG_FNC_UDP_INPUT | DBG_FUNC_END, 0,0,0,0,0);
244: return;
245: }
246: }
247:
248: if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) ||
249: in_broadcast(ip->ip_dst, m->m_pkthdr.rcvif)) {
250: struct socket *last;
251: /*
252: * Deliver a multicast or broadcast datagram to *all* sockets
253: * for which the local and remote addresses and ports match
254: * those of the incoming datagram. This allows more than
255: * one process to receive multi/broadcasts on the same port.
256: * (This really ought to be done for unicast datagrams as
257: * well, but that would cause problems with existing
258: * applications that open both address-specific sockets and
259: * a wildcard socket listening to the same port -- they would
260: * end up receiving duplicates of every unicast datagram.
261: * Those applications open the multiple sockets to overcome an
262: * inadequacy of the UDP socket interface, but for backwards
263: * compatibility we avoid the problem here rather than
264: * fixing the interface. Maybe 4.5BSD will remedy this?)
265: */
266:
267: /*
268: * Construct sockaddr format source address.
269: */
270: udp_in.sin_port = uh->uh_sport;
271: udp_in.sin_addr = ip->ip_src;
272: m->m_len -= sizeof (struct udpiphdr);
273: m->m_data += sizeof (struct udpiphdr);
274: /*
275: * Locate pcb(s) for datagram.
276: * (Algorithm copied from raw_intr().)
277: */
278: last = NULL;
279: inp = inet_lport_hash1(&udp_lport_hash_str, uh->uh_dport);
280: for (; inp != 0; inp = inp->lport_hash_next) {
281: if (inp->inp_laddr.s_addr != INADDR_ANY) {
282: if (inp->inp_laddr.s_addr !=
283: ip->ip_dst.s_addr)
284: continue;
285: }
286: if (inp->inp_faddr.s_addr != INADDR_ANY) {
287: if (inp->inp_faddr.s_addr !=
288: ip->ip_src.s_addr ||
289: inp->inp_fport != uh->uh_sport)
290: continue;
291: }
292:
293: if (last != NULL) {
294: struct mbuf *n;
295:
296: if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
297: struct mbuf * mp = 0;
298: KERNEL_DEBUG(DBG_LAYER_IN_END, uh->uh_dport, uh->uh_sport,
299: save_ip.ip_src.s_addr, save_ip.ip_dst.s_addr, uh->uh_ulen);
300:
301: if (last->so_options & SO_RCVIF)
302: mp = udp_insert_ifinfo(n);
303:
304: if (sbappendaddr(&last->so_rcv,
305: (struct sockaddr *)&udp_in,
306: n, mp) == 0) {
307: m_freem(n);
308: if (mp)
309: m_freem(mp);
310: udpstat.udps_fullsock++;
311: } else
312: sorwakeup(last);
313: }
314: }
315: last = inp->inp_socket;
316: /*
317: * Don't look for additional matches if this one does
318: * not have either the SO_REUSEPORT or SO_REUSEADDR
319: * socket options set. This heuristic avoids searching
320: * through all pcbs in the common case of a non-shared
321: * port. It * assumes that an application will never
322: * clear these options after setting them.
323: */
324: if ((last->so_options&(SO_REUSEPORT|SO_REUSEADDR) == 0))
325: break;
326: }
327:
328: if (last == NULL) {
329: /*
330: * No matching pcb found; discard datagram.
331: * (No need to send an ICMP Port Unreachable
332: * for a broadcast or multicast datgram.)
333: */
334: udpstat.udps_noportbcast++;
335: goto bad;
336: }
337:
338: KERNEL_DEBUG(DBG_LAYER_IN_END, uh->uh_dport, uh->uh_sport,
339: save_ip.ip_src.s_addr, save_ip.ip_dst.s_addr, uh->uh_ulen);
340:
341: {
342: struct mbuf * mp = 0;
343:
344: if (last->so_options & SO_RCVIF)
345: mp = udp_insert_ifinfo(m);
346: if (sbappendaddr(&last->so_rcv, (struct sockaddr *)&udp_in,
347: m, mp) == 0) {
348: udpstat.udps_fullsock++;
349: if (mp)
350: m_freem(mp);
351: goto bad;
352: }
353: }
354: sorwakeup(last);
355: KERNEL_DEBUG(DBG_FNC_UDP_INPUT | DBG_FUNC_END, 0,0,0,0,0);
356: return;
357: }
358: /*
359: * Locate pcb for datagram.
360: */
361:
362: inp = inet_hash1(&udp_hash_str, ip->ip_dst.s_addr, uh->uh_dport,
363: ip->ip_src.s_addr, uh->uh_sport);
364:
365: inp = hash_in_pcblookup(inp, ip->ip_src, uh->uh_sport,
366: ip->ip_dst, uh->uh_dport);
367: if (inp == 0) {
368: inp = inet_hash1(&udp_hash_str, 0, uh->uh_dport,0,0);
369: inp = hash_in_pcbwild(inp,
370: ip->ip_src, uh->uh_sport,
371: ip->ip_dst, uh->uh_dport, INPLOOKUP_WILDCARD);
372: /*
373: if (inp == 0)
374: udpstat.udpps_pcbcachemiss++;
375: inp = in_pcblookup(&udb, ip->ip_src, uh->uh_sport,
376: ip->ip_dst, uh->uh_dport, INPLOOKUP_WILDCARD);
377: */
378: }
379:
380:
381: if (inp == 0) {
382: udpstat.udps_noport++;
383: if (m->m_flags & (M_BCAST | M_MCAST)) {
384: udpstat.udps_noportbcast++;
385: goto bad;
386: }
387: *ip = save_ip;
388: ip->ip_len += iphlen;
389: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
390: KERNEL_DEBUG(DBG_FNC_UDP_INPUT | DBG_FUNC_END, 0,0,0,0,0);
391: return;
392: }
393:
394: /*
395: * Construct sockaddr format source address.
396: * Stuff source address and datagram in user buffer.
397: */
398: udp_in.sin_port = uh->uh_sport;
399: udp_in.sin_addr = ip->ip_src;
400:
401: {
402: struct mbuf **mp = &opts;
403: if (inp->inp_flags & INP_CONTROLOPTS) {
404:
405: if (inp->inp_flags & INP_RECVDSTADDR) {
406: *mp = udp_saveopt((caddr_t) &ip->ip_dst,
407: sizeof(struct in_addr), IP_RECVDSTADDR);
408: if (*mp)
409: mp = &(*mp)->m_next;
410: }
411: #ifdef notyet
412: /* options were tossed above */
413: if (inp->inp_flags & INP_RECVOPTS) {
414: *mp = udp_saveopt((caddr_t) opts_deleted_above,
415: sizeof(struct in_addr), IP_RECVOPTS);
416: if (*mp)
417: mp = &(*mp)->m_next;
418: }
419: /* ip_srcroute doesn't do what we want here, need to fix */
420: if (inp->inp_flags & INP_RECVRETOPTS) {
421: *mp = udp_saveopt((caddr_t) ip_srcroute(),
422: sizeof(struct in_addr), IP_RECVRETOPTS);
423: if (*mp)
424: mp = &(*mp)->m_next;
425: }
426: #endif
427: }
428:
429: if (inp->inp_socket->so_options & SO_RCVIF) {
430: /* insert receive interface info */
431: *mp = udp_insert_ifinfo(m);
432: if (*mp)
433: mp = &(*mp)->m_next;
434: }
435: }
436: iphlen += sizeof(struct udphdr);
437: m->m_len -= iphlen;
438: m->m_pkthdr.len -= iphlen;
439: m->m_data += iphlen;
440:
441: KERNEL_DEBUG(DBG_LAYER_IN_END, uh->uh_dport, uh->uh_sport,
442: save_ip.ip_src.s_addr, save_ip.ip_dst.s_addr, uh->uh_ulen);
443:
444: if (sbappendaddr(&inp->inp_socket->so_rcv, (struct sockaddr *)&udp_in,
445: m, opts) == 0) {
446: udpstat.udps_fullsock++;
447: goto bad;
448: }
449:
450: sorwakeup(inp->inp_socket);
451:
452: KERNEL_DEBUG(DBG_FNC_UDP_INPUT | DBG_FUNC_END, 0,0,0,0,0);
453: return;
454: bad:
455: m_freem(m);
456: if (opts)
457: m_freem(opts);
458:
459: KERNEL_DEBUG(DBG_FNC_UDP_INPUT | DBG_FUNC_END, 0,0,0,0,0);
460: }
461:
462: /*
463: * Create a "control" mbuf containing the specified data
464: * with the specified type/level for presentation with a datagram.
465: */
466: struct mbuf *
467: udp_savesockopt(p, size, level, type)
468: caddr_t p;
469: register int size;
470: int level;
471: int type;
472: {
473: register struct cmsghdr *cp;
474: struct mbuf *m;
475:
476: if ((m = m_get(M_DONTWAIT, MT_CONTROL)) == NULL)
477: return ((struct mbuf *) NULL);
478: cp = (struct cmsghdr *) mtod(m, struct cmsghdr *);
479: bcopy(p, CMSG_DATA(cp), size);
480: size += sizeof(*cp);
481: m->m_len = size;
482: cp->cmsg_len = size;
483: cp->cmsg_level = level;
484: cp->cmsg_type = type;
485: return (m);
486: }
487:
488: struct mbuf *
489: udp_saveopt(p, size, type)
490: caddr_t p;
491: register int size;
492: int type;
493: {
494: return (udp_savesockopt(p, size, IPPROTO_IP, type));
495: }
496:
497:
498: /*
499: * Notify a udp user of an asynchronous error;
500: * just wake up so that he can collect error status.
501: */
502: static void
503: udp_notify(inp, errno)
504: register struct inpcb *inp;
505: int errno;
506: {
507: inp->inp_socket->so_error = errno;
508: sorwakeup(inp->inp_socket);
509: sowwakeup(inp->inp_socket);
510: }
511:
512: void
513: udp_ctlinput(cmd, sa, ip)
514: int cmd;
515: struct sockaddr *sa;
516: register struct ip *ip;
517: {
518: register struct udphdr *uh;
519: extern struct in_addr zeroin_addr;
520: extern u_char inetctlerrmap[];
521:
522: if (!PRC_IS_REDIRECT(cmd) &&
523: ((unsigned)cmd >= PRC_NCMDS || inetctlerrmap[cmd] == 0))
524: return;
525: if (ip) {
526: uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
527: in_pcbnotify(&udb, sa, uh->uh_dport, ip->ip_src, uh->uh_sport,
528: cmd, udp_notify);
529: } else
530: in_pcbnotify(&udb, sa, 0, zeroin_addr, 0, cmd, udp_notify);
531: }
532:
533: int
534: udp_output(inp, m, addr, control)
535: register struct inpcb *inp;
536: register struct mbuf *m;
537: struct mbuf *addr, *control;
538: {
539: register struct udpiphdr *ui;
540: register int len = m->m_pkthdr.len;
541: struct in_addr laddr;
542: int s, error = 0;
543:
544:
545: KERNEL_DEBUG(DBG_FNC_UDP_OUTPUT | DBG_FUNC_START, 0,0,0,0,0);
546:
547: if (control)
548: m_freem(control); /* XXX */
549:
550:
551: KERNEL_DEBUG(DBG_LAYER_OUT_BEG, inp->inp_fport, inp->inp_lport,
552: inp->inp_laddr.s_addr, inp->inp_faddr.s_addr,
553: (htons((u_short)len + sizeof (struct udphdr))));
554:
555: if (addr) {
556: laddr = inp->inp_laddr;
557: if (inp->inp_faddr.s_addr != INADDR_ANY) {
558: error = EISCONN;
559: goto release;
560: }
561: /*
562: * Must block input while temporarily connected.
563: */
564: s = splnet();
565: error = in_pcbconnect(inp, addr);
566: if (error) {
567: splx(s);
568: goto release;
569: }
570: } else {
571: if (inp->inp_faddr.s_addr == INADDR_ANY) {
572: error = ENOTCONN;
573: goto release;
574: }
575: }
576: /*
577: * Calculate data length and get a mbuf
578: * for UDP and IP headers.
579: */
580: M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT);
581: if (m == 0) {
582: error = ENOBUFS;
583: goto release;
584: }
585:
586: /*
587: * Fill in mbuf with extended UDP header
588: * and addresses and length put into network format.
589: */
590: ui = mtod(m, struct udpiphdr *);
591: ui->ui_next = ui->ui_prev = 0;
592: ui->ui_x1 = 0;
593: ui->ui_pr = IPPROTO_UDP;
594: ui->ui_len = htons((u_short)len + sizeof (struct udphdr));
595: ui->ui_src = inp->inp_laddr;
596: ui->ui_dst = inp->inp_faddr;
597: ui->ui_sport = inp->inp_lport;
598: ui->ui_dport = inp->inp_fport;
599: ui->ui_ulen = ui->ui_len;
600:
601: /*
602: * Stuff checksum and output datagram.
603: */
604: ui->ui_sum = 0;
605: if (udpcksum) {
606: if ((ui->ui_sum = in_cksum(m, sizeof (struct udpiphdr) + len)) == 0)
607: ui->ui_sum = 0xffff;
608: }
609: ((struct ip *)ui)->ip_len = sizeof (struct udpiphdr) + len;
610: ((struct ip *)ui)->ip_ttl = inp->inp_ip.ip_ttl; /* XXX */
611: ((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; /* XXX */
612: udpstat.udps_opackets++;
613:
614:
615: KERNEL_DEBUG(DBG_LAYER_OUT_END, ui->ui_dport, ui->ui_sport,
616: ui->ui_src.s_addr, ui->ui_dst.s_addr, ui->ui_ulen);
617:
618: error = ip_output(m, inp->inp_options, &inp->inp_route,
619: inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST),
620: inp->inp_moptions);
621:
622: if (addr) {
623: in_pcbdisconnect(inp);
624: inp->inp_laddr = laddr;
625: hash_insert(inp);
626: splx(s);
627: }
628:
629: KERNEL_DEBUG(DBG_FNC_UDP_OUTPUT | DBG_FUNC_END, error, 0,0,0,0);
630: return (error);
631:
632: release:
633: m_freem(m);
634: KERNEL_DEBUG(DBG_FNC_UDP_OUTPUT | DBG_FUNC_END, error, 0,0,0,0);
635: return (error);
636: }
637:
638: u_long udp_sendspace = 9216; /* really max datagram size */
639: u_long udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in));
640: /* 40 1K datagrams */
641:
642: /*ARGSUSED*/
643: int
644: udp_usrreq(so, req, m, addr, control)
645: struct socket *so;
646: int req;
647: struct mbuf *m, *addr, *control;
648: {
649: struct inpcb *inp = sotoinpcb(so);
650: int error = 0;
651: int s;
652:
653: if (req == PRU_CONTROL)
654: return (in_control(so, (u_long)m, (caddr_t)addr,
655: (struct ifnet *)control));
656: if (inp == NULL && req != PRU_ATTACH) {
657: error = EINVAL;
658: goto release;
659: }
660: /*
661: * Note: need to block udp_input while changing
662: * the udp pcb queue and/or pcb addresses.
663: */
664: switch (req) {
665:
666: case PRU_ATTACH:
667: if (inp != NULL) {
668: error = EINVAL;
669: break;
670: }
671: s = splnet();
672: error = in_pcballoc(so, &udb, &udp_hash_str, &udp_lport_hash_str);
673: splx(s);
674: if (error)
675: break;
676: error = soreserve(so, udp_sendspace, udp_recvspace);
677: if (error)
678: break;
679: ((struct inpcb *) so->so_pcb)->inp_ip.ip_ttl = ip_defttl;
680: break;
681:
682: case PRU_DETACH:
683: udp_detach(inp);
684: break;
685:
686: case PRU_BIND:
687: s = splnet();
688: error = in_pcbbind(inp, addr);
689: if (error == 0) {
690: hash_insert(inp);
691: }
692:
693: splx(s);
694: break;
695:
696: case PRU_LISTEN:
697: error = EOPNOTSUPP;
698: break;
699:
700: case PRU_CONNECT:
701: if (inp->inp_faddr.s_addr != INADDR_ANY) {
702: error = EISCONN;
703: break;
704: }
705: s = splnet();
706:
707: if (inp->hash_element >= 0)
708: hash_remove(inp);
709:
710: error = in_pcbconnect(inp, addr);
711: splx(s);
712: if (error == 0)
713: soisconnected(so);
714: break;
715:
716: case PRU_CONNECT2:
717: error = EOPNOTSUPP;
718: break;
719:
720: case PRU_ACCEPT:
721: error = EOPNOTSUPP;
722: break;
723:
724: case PRU_DISCONNECT:
725: if (inp->inp_faddr.s_addr == INADDR_ANY) {
726: error = ENOTCONN;
727: break;
728: }
729: s = splnet();
730: in_pcbdisconnect(inp);
731: inp->inp_laddr.s_addr = INADDR_ANY;
732: hash_insert(inp);
733: splx(s);
734: so->so_state &= ~SS_ISCONNECTED; /* XXX */
735: break;
736:
737: case PRU_SHUTDOWN:
738: socantsendmore(so);
739: break;
740:
741: case PRU_SEND:
742: return (udp_output(inp, m, addr, control));
743:
744: case PRU_ABORT:
745: soisdisconnected(so);
746: udp_detach(inp);
747: break;
748:
749: case PRU_SOCKADDR:
750: in_setsockaddr(inp, addr);
751: break;
752:
753: case PRU_PEERADDR:
754: in_setpeeraddr(inp, addr);
755: break;
756:
757: case PRU_SENSE:
758: /*
759: * stat: don't bother with a blocksize.
760: */
761: return (0);
762:
763: case PRU_SENDOOB:
764: case PRU_FASTTIMO:
765: case PRU_SLOWTIMO:
766: case PRU_PROTORCV:
767: case PRU_PROTOSEND:
768: error = EOPNOTSUPP;
769: break;
770:
771: case PRU_RCVD:
772: case PRU_RCVOOB:
773: return (EOPNOTSUPP); /* do not free mbuf's */
774:
775: default:
776: panic("udp_usrreq");
777: }
778:
779: release:
780: if (control) {
781: printf("udp control data unexpectedly retained\n");
782: m_freem(control);
783: }
784: if (m)
785: m_freem(m);
786: return (error);
787: }
788:
789: static void
790: udp_detach(inp)
791: struct inpcb *inp;
792: {
793: int s = splnet();
794:
795: in_pcbdetach(inp);
796: splx(s);
797: }
798:
799: /*
800: * Sysctl for udp variables.
801: */
802: int
803: udp_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
804: int *name;
805: u_int namelen;
806: void *oldp;
807: size_t *oldlenp;
808: void *newp;
809: size_t newlen;
810: {
811: /* All sysctl names at this level are terminal. */
812: if (namelen != 1)
813: return (ENOTDIR);
814:
815: switch (name[0]) {
816: case UDPCTL_CHECKSUM:
817: return (sysctl_int(oldp, oldlenp, newp, newlen, &udpcksum));
818: default:
819: return (ENOPROTOOPT);
820: }
821: /* NOTREACHED */
822: }
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