Annotation of src/sys/netinet/udp_usrreq.c, Revision 1.54
1.54 ! itojun 1: /* $NetBSD: udp_usrreq.c,v 1.53 1999/12/13 15:17:21 itojun Exp $ */
1.48 itojun 2:
3: /*
4: * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
5: * All rights reserved.
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. Neither the name of the project nor the names of its contributors
16: * may be used to endorse or promote products derived from this software
17: * without specific prior written permission.
18: *
19: * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
20: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22: * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
23: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29: * SUCH DAMAGE.
30: */
1.14 cgd 31:
1.1 cgd 32: /*
1.44 thorpej 33: * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995
1.13 mycroft 34: * The Regents of the University of California. All rights reserved.
1.1 cgd 35: *
36: * Redistribution and use in source and binary forms, with or without
37: * modification, are permitted provided that the following conditions
38: * are met:
39: * 1. Redistributions of source code must retain the above copyright
40: * notice, this list of conditions and the following disclaimer.
41: * 2. Redistributions in binary form must reproduce the above copyright
42: * notice, this list of conditions and the following disclaimer in the
43: * documentation and/or other materials provided with the distribution.
44: * 3. All advertising materials mentioning features or use of this software
45: * must display the following acknowledgement:
46: * This product includes software developed by the University of
47: * California, Berkeley and its contributors.
48: * 4. Neither the name of the University nor the names of its contributors
49: * may be used to endorse or promote products derived from this software
50: * without specific prior written permission.
51: *
52: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
53: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
54: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
55: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
56: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
57: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
58: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
59: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
60: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
61: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
62: * SUCH DAMAGE.
63: *
1.44 thorpej 64: * @(#)udp_usrreq.c 8.6 (Berkeley) 5/23/95
1.1 cgd 65: */
1.50 thorpej 66:
67: #include "opt_ipsec.h"
68:
1.38 ws 69: #include "ipkdb.h"
1.1 cgd 70:
1.5 mycroft 71: #include <sys/param.h>
72: #include <sys/malloc.h>
73: #include <sys/mbuf.h>
74: #include <sys/protosw.h>
75: #include <sys/socket.h>
76: #include <sys/socketvar.h>
1.13 mycroft 77: #include <sys/errno.h>
1.5 mycroft 78: #include <sys/stat.h>
1.27 christos 79: #include <sys/systm.h>
80: #include <sys/proc.h>
1.53 itojun 81: #include <sys/domain.h>
1.27 christos 82:
83: #include <vm/vm.h>
84: #include <sys/sysctl.h>
1.1 cgd 85:
1.5 mycroft 86: #include <net/if.h>
87: #include <net/route.h>
1.1 cgd 88:
1.5 mycroft 89: #include <netinet/in.h>
90: #include <netinet/in_systm.h>
1.15 cgd 91: #include <netinet/in_var.h>
1.5 mycroft 92: #include <netinet/ip.h>
93: #include <netinet/in_pcb.h>
94: #include <netinet/ip_var.h>
95: #include <netinet/ip_icmp.h>
96: #include <netinet/udp.h>
97: #include <netinet/udp_var.h>
1.1 cgd 98:
1.53 itojun 99: #ifdef INET6
100: #include <netinet/ip6.h>
101: #include <netinet/icmp6.h>
102: #include <netinet6/ip6_var.h>
103: #include <netinet6/in6_pcb.h>
104: #include <netinet6/udp6_var.h>
105: #endif
106:
107: #ifdef PULLDOWN_TEST
108: #ifndef INET6
109: /* always need ip6.h for IP6_EXTHDR_GET */
110: #include <netinet/ip6.h>
111: #endif
112: #endif
113:
1.27 christos 114: #include <machine/stdarg.h>
115:
1.48 itojun 116: #ifdef IPSEC
117: #include <netinet6/ipsec.h>
118: #include <netkey/key.h>
119: #include <netkey/key_debug.h>
120: #endif /*IPSEC*/
121:
1.8 mycroft 122: /*
123: * UDP protocol implementation.
124: * Per RFC 768, August, 1980.
125: */
126: #ifndef COMPAT_42
127: int udpcksum = 1;
128: #else
129: int udpcksum = 0; /* XXX */
130: #endif
131:
1.53 itojun 132: static void udp4_sendup __P((struct mbuf *, int, struct sockaddr *,
133: struct socket *));
134: static int udp4_realinput __P((struct sockaddr_in *, struct sockaddr_in *,
135: struct mbuf *, int));
136: #ifdef INET6
137: static void udp6_sendup __P((struct mbuf *, int, struct sockaddr *,
138: struct socket *));
139: static int in6_mcmatch __P((struct in6pcb *, struct in6_addr *,
140: struct ifnet *));
141: static int udp6_realinput __P((int, struct sockaddr_in6 *,
142: struct sockaddr_in6 *, struct mbuf *, int));
143: #endif
1.13 mycroft 144: static void udp_notify __P((struct inpcb *, int));
1.7 mycroft 145:
1.26 mycroft 146: #ifndef UDBHASHSIZE
147: #define UDBHASHSIZE 128
148: #endif
149: int udbhashsize = UDBHASHSIZE;
150:
1.7 mycroft 151: void
1.1 cgd 152: udp_init()
153: {
1.18 mycroft 154:
1.35 mycroft 155: in_pcbinit(&udbtable, udbhashsize, udbhashsize);
1.1 cgd 156: }
157:
1.7 mycroft 158: void
1.27 christos 159: #if __STDC__
160: udp_input(struct mbuf *m, ...)
161: #else
162: udp_input(m, va_alist)
163: struct mbuf *m;
164: va_dcl
165: #endif
1.1 cgd 166: {
1.53 itojun 167: va_list ap;
168: struct sockaddr_in src, dst;
169: struct ip *ip;
170: struct udphdr *uh;
171: int iphlen, proto;
172: int len;
173: int n;
174:
175: va_start(ap, m);
176: iphlen = va_arg(ap, int);
177: proto = va_arg(ap, int);
178: va_end(ap);
179:
180: udpstat.udps_ipackets++;
181:
182: #ifndef PULLDOWN_TEST
183: /*
184: * Strip IP options, if any; should skip this,
185: * make available to user, and use on returned packets,
186: * but we don't yet have a way to check the checksum
187: * with options still present.
188: */
189: if (iphlen > sizeof (struct ip)) {
190: ip_stripoptions(m, (struct mbuf *)0);
191: iphlen = sizeof(struct ip);
192: }
193: #else
194: /*
195: * we may enable the above code if we save and pass IPv4 options
196: * to the userland.
197: */
198: #endif
199:
200: /*
201: * Get IP and UDP header together in first mbuf.
202: */
203: ip = mtod(m, struct ip *);
204: #ifndef PULLDOWN_TEST
205: if (m->m_len < iphlen + sizeof(struct udphdr)) {
206: if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == 0) {
207: udpstat.udps_hdrops++;
208: return;
209: }
210: ip = mtod(m, struct ip *);
211: }
212: uh = (struct udphdr *)((caddr_t)ip + iphlen);
213: #else
214: IP6_EXTHDR_GET(uh, struct udphdr *, m, iphlen, sizeof(struct udphdr));
215: if (uh == NULL) {
216: udpstat.udps_hdrops++;
217: return;
218: }
219: #endif
220:
221: /*
222: * Make mbuf data length reflect UDP length.
223: * If not enough data to reflect UDP length, drop.
224: */
225: len = ntohs((u_int16_t)uh->uh_ulen);
226: if (ip->ip_len != iphlen + len) {
227: if (ip->ip_len < iphlen + len) {
228: udpstat.udps_badlen++;
229: goto bad;
230: }
231: m_adj(m, iphlen + len - ip->ip_len);
232: }
233:
234: /*
235: * Checksum extended UDP header and data.
236: */
237: if (uh->uh_sum) {
238: #ifndef PULLDOWN_TEST
239: struct ip save_ip;
240:
241: /*
242: * Save a copy of the IP header in case we want restore it
243: * for sending an ICMP error message in response.
244: */
245: save_ip = *ip;
246:
247: bzero(((struct ipovly *)ip)->ih_x1,
248: sizeof ((struct ipovly *)ip)->ih_x1);
249: ((struct ipovly *)ip)->ih_len = uh->uh_ulen;
250: if (in_cksum(m, len + sizeof (struct ip)) != 0) {
251: udpstat.udps_badsum++;
252: m_freem(m);
253: return;
254: }
255:
256: *ip = save_ip;
257: #else
258: if (in4_cksum(m, IPPROTO_UDP, iphlen, len) != 0) {
259: udpstat.udps_badsum++;
260: m_freem(m);
261: return;
262: }
263: #endif
264: }
265:
266: /* construct source and dst sockaddrs. */
267: bzero(&src, sizeof(src));
268: src.sin_family = AF_INET;
269: src.sin_len = sizeof(struct sockaddr_in);
270: bcopy(&ip->ip_src, &src.sin_addr, sizeof(src.sin_addr));
271: src.sin_port = uh->uh_sport;
272: bzero(&dst, sizeof(dst));
273: dst.sin_family = AF_INET;
274: dst.sin_len = sizeof(struct sockaddr_in);
275: bcopy(&ip->ip_dst, &dst.sin_addr, sizeof(dst.sin_addr));
276: dst.sin_port = uh->uh_dport;
277:
278: n = udp4_realinput(&src, &dst, m, iphlen);
279: #ifdef INET6
280: if (IN_MULTICAST(ip->ip_dst.s_addr) || n == 0) {
281: struct sockaddr_in6 src6, dst6;
282:
283: bzero(&src6, sizeof(src6));
284: src6.sin6_family = AF_INET6;
285: src6.sin6_len = sizeof(struct sockaddr_in6);
286: src6.sin6_addr.s6_addr[10] = src6.sin6_addr.s6_addr[11] = 0xff;
287: bcopy(&ip->ip_src, &src6.sin6_addr.s6_addr[12],
288: sizeof(ip->ip_src));
289: src6.sin6_port = uh->uh_sport;
290: bzero(&dst6, sizeof(dst6));
291: dst6.sin6_family = AF_INET6;
292: dst6.sin6_len = sizeof(struct sockaddr_in6);
293: dst6.sin6_addr.s6_addr[10] = dst6.sin6_addr.s6_addr[11] = 0xff;
294: bcopy(&ip->ip_dst, &dst6.sin6_addr.s6_addr[12],
295: sizeof(ip->ip_dst));
296: dst6.sin6_port = uh->uh_dport;
297:
298: n += udp6_realinput(AF_INET, &src6, &dst6, m, iphlen);
299: }
300: #endif
301:
302: if (n == 0) {
303: udpstat.udps_noport++;
304: if (m->m_flags & (M_BCAST | M_MCAST)) {
305: udpstat.udps_noportbcast++;
306: goto bad;
307: }
308: #if NIPKDB > 0
309: if (checkipkdb(&ip->ip_src, uh->uh_sport, uh->uh_dport,
310: m, iphlen + sizeof(struct udphdr),
311: m->m_pkthdr.len - iphlen - sizeof(struct udphdr))) {
312: /*
313: * It was a debugger connect packet,
314: * just drop it now
315: */
316: goto bad;
317: }
318: #endif
319: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
320: m = NULL;
321: }
322:
323: bad:
324: if (m)
325: m_freem(m);
326: }
327:
328: #ifdef INET6
329: int
330: udp6_input(mp, offp, proto)
331: struct mbuf **mp;
332: int *offp, proto;
333: {
334: struct mbuf *m = *mp;
335: int off = *offp;
336: struct sockaddr_in6 src, dst;
337: struct ip6_hdr *ip6;
338: struct udphdr *uh;
339: u_int32_t plen, ulen;
340:
341: #if defined(NFAITH) && 0 < NFAITH
342: if (m->m_pkthdr.rcvif) {
343: if (m->m_pkthdr.rcvif->if_type == IFT_FAITH) {
344: /* send icmp6 host unreach? */
345: m_freem(m);
346: return IPPROTO_DONE;
347: }
348: }
349: #endif
350:
351: udp6stat.udp6s_ipackets++;
352:
353: #ifndef PULLDOWN_TEST
354: IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE);
355: #endif
356:
357: ip6 = mtod(m, struct ip6_hdr *);
358: /* check for jumbogram is done in ip6_input. we can trust pkthdr.len */
359: plen = m->m_pkthdr.len - off;
360: #ifndef PULLDOWN_TEST
361: uh = (struct udphdr *)((caddr_t)ip6 + off);
362: #else
363: IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(struct udphdr));
364: if (uh == NULL) {
365: ip6stat.ip6s_tooshort++;
366: return IPPROTO_DONE;
367: }
368: #endif
369: ulen = ntohs((u_short)uh->uh_ulen);
370: if (ulen == 0 && plen > 0xffff)
371: ulen = plen;
372:
373: if (plen != ulen) {
374: udp6stat.udp6s_badlen++;
1.54 ! itojun 375: goto bad;
! 376: }
! 377:
! 378: /* Be proactive about malicious use of IPv4 mapped address */
! 379: if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
! 380: IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
! 381: /* XXX stat */
1.53 itojun 382: goto bad;
383: }
384:
385: /*
386: * Checksum extended UDP header and data.
387: */
388: if (uh->uh_sum == 0)
389: udp6stat.udp6s_nosum++;
390: else if (in6_cksum(m, IPPROTO_UDP, off, ulen) != 0) {
391: udp6stat.udp6s_badsum++;
392: goto bad;
393: }
394:
395: /*
396: * Construct source and dst sockaddrs.
397: * Note that ifindex (s6_addr16[1]) is already filled.
398: */
399: bzero(&src, sizeof(src));
400: src.sin6_family = AF_INET6;
401: src.sin6_len = sizeof(struct sockaddr_in6);
402: bcopy(&ip6->ip6_src, &src.sin6_addr, sizeof(src.sin6_addr));
403: if (IN6_IS_SCOPE_LINKLOCAL(&src.sin6_addr))
404: src.sin6_addr.s6_addr16[1] = 0;
405: if (m->m_pkthdr.rcvif) {
406: if (IN6_IS_SCOPE_LINKLOCAL(&src.sin6_addr))
407: src.sin6_scope_id = m->m_pkthdr.rcvif->if_index;
408: else
409: src.sin6_scope_id = 0;
410: }
411: src.sin6_port = uh->uh_sport;
412: bzero(&dst, sizeof(dst));
413: dst.sin6_family = AF_INET6;
414: dst.sin6_len = sizeof(struct sockaddr_in6);
415: bcopy(&ip6->ip6_dst, &dst.sin6_addr, sizeof(dst.sin6_addr));
416: if (IN6_IS_SCOPE_LINKLOCAL(&dst.sin6_addr))
417: dst.sin6_addr.s6_addr16[1] = 0;
418: if (m->m_pkthdr.rcvif) {
419: if (IN6_IS_SCOPE_LINKLOCAL(&dst.sin6_addr))
420: dst.sin6_scope_id = m->m_pkthdr.rcvif->if_index;
421: else
422: dst.sin6_scope_id = 0;
423: }
424: dst.sin6_port = uh->uh_dport;
425:
426: if (udp6_realinput(AF_INET6, &src, &dst, m, off) == 0) {
427: udp6stat.udp6s_noport++;
428: if (m->m_flags & M_MCAST) {
429: udp6stat.udp6s_noportmcast++;
430: goto bad;
431: }
432: icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
433: m = NULL;
434: }
435:
436: bad:
437: if (m)
438: m_freem(m);
439: return IPPROTO_DONE;
440: }
441: #endif
442:
443: static void
444: udp4_sendup(m, off, src, so)
445: struct mbuf *m;
446: int off; /* offset of data portion */
447: struct sockaddr *src;
448: struct socket *so;
449: {
450: struct mbuf *opts = NULL;
451: struct mbuf *n;
452: struct inpcb *inp = NULL;
453: #ifdef INET6
454: struct in6pcb *in6p = NULL;
455: #endif
456:
457: if (!so)
458: return;
459: switch (so->so_proto->pr_domain->dom_family) {
460: case AF_INET:
461: inp = sotoinpcb(so);
462: break;
463: #ifdef INET6
464: case AF_INET6:
465: in6p = sotoin6pcb(so);
466: break;
467: #endif
468: default:
469: return;
470: }
471:
472: #ifdef IPSEC
473: /* check AH/ESP integrity. */
474: if (so != NULL && ipsec4_in_reject_so(m, so)) {
475: ipsecstat.in_polvio++;
476: return;
477: }
478: #endif /*IPSEC*/
479:
480: if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
481: if (inp && (inp->inp_flags & INP_CONTROLOPTS
482: || so->so_options & SO_TIMESTAMP)) {
483: struct ip *ip = mtod(n, struct ip *);
484: ip_savecontrol(inp, &opts, ip, n);
485: }
486:
487: m_adj(n, off);
488: if (sbappendaddr(&so->so_rcv, src, n,
489: opts) == 0) {
490: m_freem(n);
491: if (opts)
492: m_freem(opts);
493: } else
494: sorwakeup(so);
495: }
496: }
497:
498: #ifdef INET6
499: static void
500: udp6_sendup(m, off, src, so)
501: struct mbuf *m;
502: int off; /* offset of data portion */
503: struct sockaddr *src;
504: struct socket *so;
505: {
506: struct mbuf *opts = NULL;
507: struct mbuf *n;
508: struct in6pcb *in6p = NULL;
509:
510: if (!so)
511: return;
512: if (so->so_proto->pr_domain->dom_family != AF_INET6)
513: return;
514: in6p = sotoin6pcb(so);
515:
516: #ifdef IPSEC
517: /* check AH/ESP integrity. */
518: if (so != NULL && ipsec6_in_reject_so(m, so)) {
519: ipsec6stat.in_polvio++;
520: return;
521: }
522: #endif /*IPSEC*/
523:
524: if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
525: if (in6p && (in6p->in6p_flags & IN6P_CONTROLOPTS
526: || in6p->in6p_socket->so_options & SO_TIMESTAMP)) {
527: struct ip6_hdr *ip6 = mtod(n, struct ip6_hdr *);
528: ip6_savecontrol(in6p, &opts, ip6, n);
529: }
530:
531: m_adj(n, off);
532: if (sbappendaddr(&so->so_rcv, src, n, opts) == 0) {
533: m_freem(n);
534: if (opts)
535: m_freem(opts);
536: udp6stat.udp6s_fullsock++;
537: } else
538: sorwakeup(so);
539: }
540: }
541: #endif
542:
543: static int
544: udp4_realinput(src, dst, m, off)
545: struct sockaddr_in *src;
546: struct sockaddr_in *dst;
547: struct mbuf *m;
548: int off; /* offset of udphdr */
549: {
550: u_int16_t *sport, *dport;
551: int rcvcnt;
552: struct in_addr *src4, *dst4;
553: struct inpcb *inp;
554:
555: rcvcnt = 0;
556: off += sizeof(struct udphdr); /* now, offset of payload */
557:
558: if (src->sin_family != AF_INET || dst->sin_family != AF_INET)
559: goto bad;
560:
561: src4 = &src->sin_addr;
562: sport = &src->sin_port;
563: dst4 = &dst->sin_addr;
564: dport = &dst->sin_port;
565:
566: if (IN_MULTICAST(src4->s_addr) ||
567: in_broadcast(*dst4, m->m_pkthdr.rcvif)) {
568: struct inpcb *last;
569: /*
570: * Deliver a multicast or broadcast datagram to *all* sockets
571: * for which the local and remote addresses and ports match
572: * those of the incoming datagram. This allows more than
573: * one process to receive multi/broadcasts on the same port.
574: * (This really ought to be done for unicast datagrams as
575: * well, but that would cause problems with existing
576: * applications that open both address-specific sockets and
577: * a wildcard socket listening to the same port -- they would
578: * end up receiving duplicates of every unicast datagram.
579: * Those applications open the multiple sockets to overcome an
580: * inadequacy of the UDP socket interface, but for backwards
581: * compatibility we avoid the problem here rather than
582: * fixing the interface. Maybe 4.5BSD will remedy this?)
583: */
584:
585: /*
586: * KAME note: usually we drop udpiphdr from mbuf here.
587: * we need udpiphdr for iPsec processing so we do that later.
588: */
589: /*
590: * Locate pcb(s) for datagram.
591: */
592: for (inp = udbtable.inpt_queue.cqh_first;
593: inp != (struct inpcb *)&udbtable.inpt_queue;
594: inp = inp->inp_queue.cqe_next) {
595: if (inp->inp_lport != *dport)
596: continue;
597: if (!in_nullhost(inp->inp_laddr)) {
598: if (!in_hosteq(inp->inp_laddr, *dst4))
599: continue;
600: }
601: if (!in_nullhost(inp->inp_faddr)) {
602: if (!in_hosteq(inp->inp_faddr, *src4) ||
603: inp->inp_fport != *sport)
604: continue;
605: }
606:
607: last = inp;
608: udp4_sendup(m, off, (struct sockaddr *)src,
609: inp->inp_socket);
610: rcvcnt++;
611:
612: /*
613: * Don't look for additional matches if this one does
614: * not have either the SO_REUSEPORT or SO_REUSEADDR
615: * socket options set. This heuristic avoids searching
616: * through all pcbs in the common case of a non-shared
617: * port. It assumes that an application will never
618: * clear these options after setting them.
619: */
620: if ((inp->inp_socket->so_options &
621: (SO_REUSEPORT|SO_REUSEADDR)) == 0)
622: break;
623: }
624:
625: #if 0
626: if (last == NULL) {
627: /*
628: * No matching pcb found; discard datagram.
629: * (No need to send an ICMP Port Unreachable
630: * for a broadcast or multicast datgram.)
631: */
632: udpstat.udps_noport++;
633: udpstat.udps_noportbcast++;
634: goto bad;
635: }
636: #endif
637: } else {
638: /*
639: * Locate pcb for datagram.
640: */
641: inp = in_pcblookup_connect(&udbtable, *src4, *sport, *dst4, *dport);
642: if (inp == 0) {
643: ++udpstat.udps_pcbhashmiss;
644: inp = in_pcblookup_bind(&udbtable, *dst4, *dport);
645: if (inp == 0) {
646: #if 0
647: struct mbuf *n;
648:
649: udpstat.udps_noport++;
650: if (m->m_flags & (M_BCAST | M_MCAST)) {
651: udpstat.udps_noportbcast++;
652: goto bad;
653: }
654: #if NIPKDB > 0
655: if (checkipkdb(src4, *sport, *dport, m, off,
656: m->m_pkthdr.len - off)) {
657: /*
658: * It was a debugger connect packet,
659: * just drop it now
660: */
661: goto bad;
662: }
663: #endif
664: if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
665: icmp_error(n, ICMP_UNREACH,
666: ICMP_UNREACH_PORT, 0, 0);
667: }
668: #endif
669: return rcvcnt;
670: }
671: }
672:
673: udp4_sendup(m, off, (struct sockaddr *)src, inp->inp_socket);
674: rcvcnt++;
675: }
676:
677: bad:
678: return rcvcnt;
679: }
680:
681: #ifdef INET6
682: static int
683: in6_mcmatch(in6p, ia6, ifp)
684: struct in6pcb *in6p;
685: register struct in6_addr *ia6;
686: struct ifnet *ifp;
687: {
688: struct ip6_moptions *im6o = in6p->in6p_moptions;
689: struct in6_multi_mship *imm;
690:
691: if (im6o == NULL)
692: return 0;
693:
694: for (imm = im6o->im6o_memberships.lh_first; imm != NULL;
695: imm = imm->i6mm_chain.le_next) {
696: if ((ifp == NULL ||
697: imm->i6mm_maddr->in6m_ifp == ifp) &&
698: IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr,
699: ia6))
700: return 1;
701: }
702: return 0;
703: }
704:
705: static int
706: udp6_realinput(af, src, dst, m, off)
707: int af; /* af on packet */
708: struct sockaddr_in6 *src;
709: struct sockaddr_in6 *dst;
710: struct mbuf *m;
711: int off; /* offset of udphdr */
712: {
713: u_int16_t *sport, *dport;
714: int rcvcnt;
715: struct in6_addr *src6, *dst6;
716: struct in_addr *src4;
717: struct in6pcb *in6p;
718:
719: rcvcnt = 0;
720: off += sizeof(struct udphdr); /* now, offset of payload */
721:
722: if (af != AF_INET && af != AF_INET6)
723: goto bad;
724: if (src->sin6_family != AF_INET6 || dst->sin6_family != AF_INET6)
725: goto bad;
726:
727: src6 = &src->sin6_addr;
728: sport = &src->sin6_port;
729: dst6 = &dst->sin6_addr;
730: dport = &dst->sin6_port;
731: src4 = (struct in_addr *)&src->sin6_addr.s6_addr32[12];
732:
733: if (IN6_IS_ADDR_MULTICAST(dst6)
734: || (af == AF_INET && IN_MULTICAST(src4->s_addr))) {
735: struct in6pcb *last;
736: /*
737: * Deliver a multicast or broadcast datagram to *all* sockets
738: * for which the local and remote addresses and ports match
739: * those of the incoming datagram. This allows more than
740: * one process to receive multi/broadcasts on the same port.
741: * (This really ought to be done for unicast datagrams as
742: * well, but that would cause problems with existing
743: * applications that open both address-specific sockets and
744: * a wildcard socket listening to the same port -- they would
745: * end up receiving duplicates of every unicast datagram.
746: * Those applications open the multiple sockets to overcome an
747: * inadequacy of the UDP socket interface, but for backwards
748: * compatibility we avoid the problem here rather than
749: * fixing the interface. Maybe 4.5BSD will remedy this?)
750: */
751:
752: /*
753: * KAME note: usually we drop udpiphdr from mbuf here.
754: * we need udpiphdr for iPsec processing so we do that later.
755: */
756: /*
757: * Locate pcb(s) for datagram.
758: */
759: for (in6p = udb6.in6p_next; in6p != &udb6;
760: in6p = in6p->in6p_next) {
761: if (in6p->in6p_lport != *dport)
762: continue;
763: if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
764: if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, dst6)
765: && !in6_mcmatch(in6p, dst6, m->m_pkthdr.rcvif))
766: continue;
767: }
768: if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
769: if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, src6)
770: || in6p->in6p_fport != *sport)
771: continue;
772: }
773:
774: last = in6p;
775: udp6_sendup(m, off, (struct sockaddr *)src,
776: in6p->in6p_socket);
777: rcvcnt++;
778:
779: /*
780: * Don't look for additional matches if this one does
781: * not have either the SO_REUSEPORT or SO_REUSEADDR
782: * socket options set. This heuristic avoids searching
783: * through all pcbs in the common case of a non-shared
784: * port. It assumes that an application will never
785: * clear these options after setting them.
786: */
787: if ((in6p->in6p_socket->so_options &
788: (SO_REUSEPORT|SO_REUSEADDR)) == 0)
789: break;
790: }
791:
792: #if 0
793: if (last == NULL) {
794: /*
795: * No matching pcb found; discard datagram.
796: * (No need to send an ICMP Port Unreachable
797: * for a broadcast or multicast datgram.)
798: */
799: switch (af) {
800: case AF_INET:
801: udpstat.udps_noport++;
802: udpstat.udps_noportbcast++;
803: break;
804: case AF_INET6:
805: udp6stat.udp6s_noport++;
806: udp6stat.udp6s_noportmcast++;
807: break;
808: }
809: goto bad;
810: }
811: #endif
812: } else {
813: /*
814: * Locate pcb for datagram.
815: */
816: in6p = in6_pcblookup_connect(&udb6, src6, *sport,
817: dst6, *dport, 0);
818: if (in6p == 0) {
819: ++udpstat.udps_pcbhashmiss;
820: in6p = in6_pcblookup_bind(&udb6, dst6, *dport, 0);
821: if (in6p == 0) {
822: #if 0
823: struct mbuf *n;
824: n = m_copy(m, 0, M_COPYALL);
825: switch (af) {
826: case AF_INET:
827: udpstat.udps_noport++;
828: if (m->m_flags & (M_BCAST | M_MCAST)) {
829: udpstat.udps_noportbcast++;
830: goto bad;
831: }
832: if (n != NULL)
833: icmp_error(n, ICMP_UNREACH,
834: ICMP_UNREACH_PORT, 0, 0);
835: break;
836: case AF_INET6:
837: udp6stat.udp6s_noport++;
838: if (m->m_flags & M_MCAST) {
839: udp6stat.udp6s_noportmcast++;
840: goto bad;
841: }
842: if (n != NULL)
843: icmp6_error(n, ICMP6_DST_UNREACH,
844: ICMP6_DST_UNREACH_NOPORT, 0);
845: break;
846: }
847: #endif
848:
849: return rcvcnt;
850: }
851: }
852:
853: udp6_sendup(m, off, (struct sockaddr *)src, in6p->in6p_socket);
854: rcvcnt++;
855: }
856:
857: bad:
858: return rcvcnt;
859: }
860: #endif
861:
862: #if 0
863: void
864: #if __STDC__
865: udp_input(struct mbuf *m, ...)
866: #else
867: udp_input(m, va_alist)
868: struct mbuf *m;
869: va_dcl
870: #endif
871: {
1.48 itojun 872: int proto;
1.1 cgd 873: register struct ip *ip;
874: register struct udphdr *uh;
875: register struct inpcb *inp;
876: struct mbuf *opts = 0;
877: int len;
878: struct ip save_ip;
1.27 christos 879: int iphlen;
880: va_list ap;
1.34 mycroft 881: struct sockaddr_in udpsrc;
1.48 itojun 882: struct sockaddr *sa;
1.27 christos 883:
884: va_start(ap, m);
885: iphlen = va_arg(ap, int);
1.48 itojun 886: proto = va_arg(ap, int);
1.27 christos 887: va_end(ap);
1.1 cgd 888:
889: udpstat.udps_ipackets++;
890:
891: /*
892: * Strip IP options, if any; should skip this,
893: * make available to user, and use on returned packets,
894: * but we don't yet have a way to check the checksum
895: * with options still present.
896: */
897: if (iphlen > sizeof (struct ip)) {
898: ip_stripoptions(m, (struct mbuf *)0);
899: iphlen = sizeof(struct ip);
900: }
901:
902: /*
903: * Get IP and UDP header together in first mbuf.
904: */
905: ip = mtod(m, struct ip *);
906: if (m->m_len < iphlen + sizeof(struct udphdr)) {
907: if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == 0) {
908: udpstat.udps_hdrops++;
909: return;
910: }
911: ip = mtod(m, struct ip *);
912: }
913: uh = (struct udphdr *)((caddr_t)ip + iphlen);
914:
915: /*
916: * Make mbuf data length reflect UDP length.
917: * If not enough data to reflect UDP length, drop.
918: */
1.15 cgd 919: len = ntohs((u_int16_t)uh->uh_ulen);
1.47 mycroft 920: if (ip->ip_len != iphlen + len) {
921: if (ip->ip_len < iphlen + len) {
1.1 cgd 922: udpstat.udps_badlen++;
923: goto bad;
924: }
1.47 mycroft 925: m_adj(m, iphlen + len - ip->ip_len);
1.1 cgd 926: }
927: /*
928: * Save a copy of the IP header in case we want restore it
929: * for sending an ICMP error message in response.
930: */
931: save_ip = *ip;
932:
933: /*
934: * Checksum extended UDP header and data.
935: */
1.29 mrg 936: if (uh->uh_sum) {
1.25 cgd 937: bzero(((struct ipovly *)ip)->ih_x1,
938: sizeof ((struct ipovly *)ip)->ih_x1);
1.1 cgd 939: ((struct ipovly *)ip)->ih_len = uh->uh_ulen;
1.46 mycroft 940: if (in_cksum(m, len + sizeof (struct ip)) != 0) {
1.1 cgd 941: udpstat.udps_badsum++;
942: m_freem(m);
943: return;
944: }
945: }
1.13 mycroft 946:
1.48 itojun 947: /*
948: * Construct sockaddr format source address.
949: */
950: udpsrc.sin_family = AF_INET;
951: udpsrc.sin_len = sizeof(struct sockaddr_in);
952: udpsrc.sin_addr = ip->ip_src;
953: udpsrc.sin_port = uh->uh_sport;
954: bzero((caddr_t)udpsrc.sin_zero, sizeof(udpsrc.sin_zero));
955:
1.16 mycroft 956: if (IN_MULTICAST(ip->ip_dst.s_addr) ||
1.13 mycroft 957: in_broadcast(ip->ip_dst, m->m_pkthdr.rcvif)) {
1.40 thorpej 958: struct inpcb *last;
1.4 hpeyerl 959: /*
960: * Deliver a multicast or broadcast datagram to *all* sockets
961: * for which the local and remote addresses and ports match
962: * those of the incoming datagram. This allows more than
963: * one process to receive multi/broadcasts on the same port.
964: * (This really ought to be done for unicast datagrams as
965: * well, but that would cause problems with existing
966: * applications that open both address-specific sockets and
967: * a wildcard socket listening to the same port -- they would
968: * end up receiving duplicates of every unicast datagram.
969: * Those applications open the multiple sockets to overcome an
970: * inadequacy of the UDP socket interface, but for backwards
971: * compatibility we avoid the problem here rather than
1.13 mycroft 972: * fixing the interface. Maybe 4.5BSD will remedy this?)
1.4 hpeyerl 973: */
1.13 mycroft 974:
1.48 itojun 975: iphlen += sizeof(struct udphdr);
1.4 hpeyerl 976: /*
1.48 itojun 977: * KAME note: usually we drop udpiphdr from mbuf here.
978: * we need udpiphdr for iPsec processing so we do that later.
1.4 hpeyerl 979: */
980: /*
981: * Locate pcb(s) for datagram.
982: * (Algorithm copied from raw_intr().)
983: */
984: last = NULL;
1.22 cgd 985: for (inp = udbtable.inpt_queue.cqh_first;
986: inp != (struct inpcb *)&udbtable.inpt_queue;
987: inp = inp->inp_queue.cqe_next) {
1.4 hpeyerl 988: if (inp->inp_lport != uh->uh_dport)
989: continue;
1.34 mycroft 990: if (!in_nullhost(inp->inp_laddr)) {
991: if (!in_hosteq(inp->inp_laddr, ip->ip_dst))
1.4 hpeyerl 992: continue;
993: }
1.34 mycroft 994: if (!in_nullhost(inp->inp_faddr)) {
995: if (!in_hosteq(inp->inp_faddr, ip->ip_src) ||
1.4 hpeyerl 996: inp->inp_fport != uh->uh_sport)
997: continue;
998: }
999:
1000: if (last != NULL) {
1001: struct mbuf *n;
1002:
1.48 itojun 1003: #ifdef IPSEC
1004: /* check AH/ESP integrity. */
1005: if (last != NULL && ipsec4_in_reject(m, last)) {
1006: ipsecstat.in_polvio++;
1007: /* do not inject data to pcb */
1008: } else
1009: #endif /*IPSEC*/
1.4 hpeyerl 1010: if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
1.40 thorpej 1011: if (last->inp_flags & INP_CONTROLOPTS
1012: || last->inp_socket->so_options &
1013: SO_TIMESTAMP) {
1014: ip_savecontrol(last, &opts,
1015: ip, n);
1016: }
1.49 drochner 1017: m_adj(n, iphlen);
1.48 itojun 1018: sa = (struct sockaddr *)&udpsrc;
1.40 thorpej 1019: if (sbappendaddr(
1020: &last->inp_socket->so_rcv,
1.48 itojun 1021: sa, n, opts) == 0) {
1.4 hpeyerl 1022: m_freem(n);
1.40 thorpej 1023: if (opts)
1024: m_freem(opts);
1.13 mycroft 1025: } else
1.40 thorpej 1026: sorwakeup(last->inp_socket);
1027: opts = 0;
1.4 hpeyerl 1028: }
1029: }
1.40 thorpej 1030: last = inp;
1.4 hpeyerl 1031: /*
1.13 mycroft 1032: * Don't look for additional matches if this one does
1033: * not have either the SO_REUSEPORT or SO_REUSEADDR
1034: * socket options set. This heuristic avoids searching
1035: * through all pcbs in the common case of a non-shared
1036: * port. It * assumes that an application will never
1037: * clear these options after setting them.
1.4 hpeyerl 1038: */
1.40 thorpej 1039: if ((last->inp_socket->so_options &
1040: (SO_REUSEPORT|SO_REUSEADDR)) == 0)
1.4 hpeyerl 1041: break;
1042: }
1.6 mycroft 1043:
1.4 hpeyerl 1044: if (last == NULL) {
1045: /*
1046: * No matching pcb found; discard datagram.
1047: * (No need to send an ICMP Port Unreachable
1048: * for a broadcast or multicast datgram.)
1049: */
1.48 itojun 1050: udpstat.udps_noport++;
1.13 mycroft 1051: udpstat.udps_noportbcast++;
1.4 hpeyerl 1052: goto bad;
1053: }
1.48 itojun 1054: #ifdef IPSEC
1055: /* check AH/ESP integrity. */
1056: if (last != NULL && ipsec4_in_reject(m, last)) {
1057: ipsecstat.in_polvio++;
1058: goto bad;
1059: }
1060: #endif /*IPSEC*/
1.40 thorpej 1061: if (last->inp_flags & INP_CONTROLOPTS ||
1062: last->inp_socket->so_options & SO_TIMESTAMP)
1063: ip_savecontrol(last, &opts, ip, m);
1.49 drochner 1064: m->m_len -= iphlen;
1065: m->m_pkthdr.len -= iphlen;
1066: m->m_data += iphlen;
1.48 itojun 1067: sa = (struct sockaddr *)&udpsrc;
1068: if (sbappendaddr(&last->inp_socket->so_rcv, sa, m, opts) == 0) {
1.13 mycroft 1069: udpstat.udps_fullsock++;
1.4 hpeyerl 1070: goto bad;
1.13 mycroft 1071: }
1.40 thorpej 1072: sorwakeup(last->inp_socket);
1.4 hpeyerl 1073: return;
1074: }
1.1 cgd 1075: /*
1076: * Locate pcb for datagram.
1077: */
1.35 mycroft 1078: inp = in_pcblookup_connect(&udbtable, ip->ip_src, uh->uh_sport,
1.26 mycroft 1079: ip->ip_dst, uh->uh_dport);
1080: if (inp == 0) {
1081: ++udpstat.udps_pcbhashmiss;
1.35 mycroft 1082: inp = in_pcblookup_bind(&udbtable, ip->ip_dst, uh->uh_dport);
1.18 mycroft 1083: if (inp == 0) {
1084: udpstat.udps_noport++;
1085: if (m->m_flags & (M_BCAST | M_MCAST)) {
1086: udpstat.udps_noportbcast++;
1087: goto bad;
1088: }
1089: *ip = save_ip;
1.38 ws 1090: #if NIPKDB > 0
1091: if (checkipkdb(&ip->ip_src,
1092: uh->uh_sport,
1093: uh->uh_dport,
1094: m,
1095: iphlen + sizeof(struct udphdr),
1096: len - sizeof(struct udphdr)))
1.37 ws 1097: /* It was a debugger connect packet, just drop it now */
1098: goto bad;
1099: #endif
1.18 mycroft 1100: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
1101: return;
1.13 mycroft 1102: }
1.1 cgd 1103: }
1.48 itojun 1104: #ifdef IPSEC
1105: if (inp != NULL && ipsec4_in_reject(m, inp)) {
1106: ipsecstat.in_polvio++;
1107: goto bad;
1108: }
1109: #endif /*IPSEC*/
1.1 cgd 1110:
1111: /*
1112: * Stuff source address and datagram in user buffer.
1113: */
1.40 thorpej 1114: if (inp->inp_flags & INP_CONTROLOPTS ||
1115: inp->inp_socket->so_options & SO_TIMESTAMP)
1116: ip_savecontrol(inp, &opts, ip, m);
1.1 cgd 1117: iphlen += sizeof(struct udphdr);
1118: m->m_len -= iphlen;
1119: m->m_pkthdr.len -= iphlen;
1120: m->m_data += iphlen;
1.48 itojun 1121: sa = (struct sockaddr *)&udpsrc;
1122: if (sbappendaddr(&inp->inp_socket->so_rcv, sa, m, opts) == 0) {
1.1 cgd 1123: udpstat.udps_fullsock++;
1124: goto bad;
1125: }
1126: sorwakeup(inp->inp_socket);
1127: return;
1128: bad:
1129: m_freem(m);
1130: if (opts)
1131: m_freem(opts);
1132: }
1.53 itojun 1133: #endif
1.1 cgd 1134:
1135: /*
1136: * Notify a udp user of an asynchronous error;
1137: * just wake up so that he can collect error status.
1138: */
1.7 mycroft 1139: static void
1.1 cgd 1140: udp_notify(inp, errno)
1141: register struct inpcb *inp;
1.7 mycroft 1142: int errno;
1.1 cgd 1143: {
1.34 mycroft 1144:
1.1 cgd 1145: inp->inp_socket->so_error = errno;
1146: sorwakeup(inp->inp_socket);
1147: sowwakeup(inp->inp_socket);
1148: }
1149:
1.27 christos 1150: void *
1151: udp_ctlinput(cmd, sa, v)
1.1 cgd 1152: int cmd;
1153: struct sockaddr *sa;
1.27 christos 1154: void *v;
1.1 cgd 1155: {
1.27 christos 1156: register struct ip *ip = v;
1.1 cgd 1157: register struct udphdr *uh;
1.21 mycroft 1158: extern int inetctlerrmap[];
1.18 mycroft 1159: void (*notify) __P((struct inpcb *, int)) = udp_notify;
1.21 mycroft 1160: int errno;
1.1 cgd 1161:
1.53 itojun 1162: if (sa->sa_family != AF_INET
1163: || sa->sa_len != sizeof(struct sockaddr_in))
1.51 itojun 1164: return NULL;
1.20 mycroft 1165: if ((unsigned)cmd >= PRC_NCMDS)
1.27 christos 1166: return NULL;
1.20 mycroft 1167: errno = inetctlerrmap[cmd];
1.18 mycroft 1168: if (PRC_IS_REDIRECT(cmd))
1.19 mycroft 1169: notify = in_rtchange, ip = 0;
1.18 mycroft 1170: else if (cmd == PRC_HOSTDEAD)
1.19 mycroft 1171: ip = 0;
1.23 cgd 1172: else if (errno == 0)
1.27 christos 1173: return NULL;
1.19 mycroft 1174: if (ip) {
1.1 cgd 1175: uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
1.34 mycroft 1176: in_pcbnotify(&udbtable, satosin(sa)->sin_addr, uh->uh_dport,
1177: ip->ip_src, uh->uh_sport, errno, notify);
1.53 itojun 1178:
1179: /* XXX mapped address case */
1.19 mycroft 1180: } else
1.34 mycroft 1181: in_pcbnotifyall(&udbtable, satosin(sa)->sin_addr, errno,
1182: notify);
1.27 christos 1183: return NULL;
1.1 cgd 1184: }
1185:
1.7 mycroft 1186: int
1.27 christos 1187: #if __STDC__
1188: udp_output(struct mbuf *m, ...)
1189: #else
1190: udp_output(m, va_alist)
1191: struct mbuf *m;
1192: va_dcl
1193: #endif
1194: {
1.1 cgd 1195: register struct inpcb *inp;
1196: register struct udpiphdr *ui;
1197: register int len = m->m_pkthdr.len;
1.31 mycroft 1198: int error = 0;
1.27 christos 1199: va_list ap;
1200:
1201: va_start(ap, m);
1202: inp = va_arg(ap, struct inpcb *);
1203: va_end(ap);
1.1 cgd 1204:
1205: /*
1206: * Calculate data length and get a mbuf
1207: * for UDP and IP headers.
1208: */
1.13 mycroft 1209: M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT);
1210: if (m == 0) {
1211: error = ENOBUFS;
1.39 thorpej 1212: goto release;
1213: }
1214:
1215: /*
1216: * Compute the packet length of the IP header, and
1217: * punt if the length looks bogus.
1218: */
1219: if ((len + sizeof(struct udpiphdr)) > IP_MAXPACKET) {
1220: error = EMSGSIZE;
1.13 mycroft 1221: goto release;
1222: }
1.1 cgd 1223:
1224: /*
1225: * Fill in mbuf with extended UDP header
1226: * and addresses and length put into network format.
1227: */
1228: ui = mtod(m, struct udpiphdr *);
1.25 cgd 1229: bzero(ui->ui_x1, sizeof ui->ui_x1);
1.1 cgd 1230: ui->ui_pr = IPPROTO_UDP;
1.15 cgd 1231: ui->ui_len = htons((u_int16_t)len + sizeof (struct udphdr));
1.1 cgd 1232: ui->ui_src = inp->inp_laddr;
1233: ui->ui_dst = inp->inp_faddr;
1234: ui->ui_sport = inp->inp_lport;
1235: ui->ui_dport = inp->inp_fport;
1236: ui->ui_ulen = ui->ui_len;
1237:
1238: /*
1239: * Stuff checksum and output datagram.
1240: */
1241: ui->ui_sum = 0;
1242: if (udpcksum) {
1243: if ((ui->ui_sum = in_cksum(m, sizeof (struct udpiphdr) + len)) == 0)
1244: ui->ui_sum = 0xffff;
1245: }
1246: ((struct ip *)ui)->ip_len = sizeof (struct udpiphdr) + len;
1247: ((struct ip *)ui)->ip_ttl = inp->inp_ip.ip_ttl; /* XXX */
1248: ((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; /* XXX */
1249: udpstat.udps_opackets++;
1.48 itojun 1250:
1251: #ifdef IPSEC
1252: m->m_pkthdr.rcvif = (struct ifnet *)inp->inp_socket;
1253: #endif /*IPSEC*/
1254:
1.31 mycroft 1255: return (ip_output(m, inp->inp_options, &inp->inp_route,
1.12 mycroft 1256: inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST),
1.31 mycroft 1257: inp->inp_moptions));
1.1 cgd 1258:
1259: release:
1260: m_freem(m);
1261: return (error);
1262: }
1263:
1.42 thorpej 1264: int udp_sendspace = 9216; /* really max datagram size */
1265: int udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in));
1.1 cgd 1266: /* 40 1K datagrams */
1267:
1268: /*ARGSUSED*/
1.7 mycroft 1269: int
1.31 mycroft 1270: udp_usrreq(so, req, m, nam, control, p)
1.1 cgd 1271: struct socket *so;
1272: int req;
1.31 mycroft 1273: struct mbuf *m, *nam, *control;
1.30 mycroft 1274: struct proc *p;
1.1 cgd 1275: {
1.31 mycroft 1276: register struct inpcb *inp;
1.1 cgd 1277: int s;
1.31 mycroft 1278: register int error = 0;
1.1 cgd 1279:
1280: if (req == PRU_CONTROL)
1.31 mycroft 1281: return (in_control(so, (long)m, (caddr_t)nam,
1.30 mycroft 1282: (struct ifnet *)control, p));
1.31 mycroft 1283:
1284: s = splsoftnet();
1285: inp = sotoinpcb(so);
1.32 mycroft 1286: #ifdef DIAGNOSTIC
1287: if (req != PRU_SEND && req != PRU_SENDOOB && control)
1288: panic("udp_usrreq: unexpected control mbuf");
1289: #endif
1.31 mycroft 1290: if (inp == 0 && req != PRU_ATTACH) {
1291: error = EINVAL;
1292: goto release;
1293: }
1294:
1.1 cgd 1295: /*
1296: * Note: need to block udp_input while changing
1297: * the udp pcb queue and/or pcb addresses.
1298: */
1299: switch (req) {
1300:
1301: case PRU_ATTACH:
1.31 mycroft 1302: if (inp != 0) {
1303: error = EISCONN;
1.1 cgd 1304: break;
1305: }
1.31 mycroft 1306: if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
1307: error = soreserve(so, udp_sendspace, udp_recvspace);
1308: if (error)
1309: break;
1310: }
1.18 mycroft 1311: error = in_pcballoc(so, &udbtable);
1.1 cgd 1312: if (error)
1313: break;
1.31 mycroft 1314: inp = sotoinpcb(so);
1315: inp->inp_ip.ip_ttl = ip_defttl;
1.48 itojun 1316: #ifdef IPSEC
1.53 itojun 1317: error = ipsec_init_policy(&inp->inp_sp);
1318: if (error != 0) {
1.52 itojun 1319: in_pcbdetach(inp);
1.53 itojun 1320: break;
1321: }
1.48 itojun 1322: #endif /*IPSEC*/
1.1 cgd 1323: break;
1324:
1325: case PRU_DETACH:
1.31 mycroft 1326: in_pcbdetach(inp);
1.1 cgd 1327: break;
1328:
1329: case PRU_BIND:
1.31 mycroft 1330: error = in_pcbbind(inp, nam, p);
1.1 cgd 1331: break;
1332:
1333: case PRU_LISTEN:
1334: error = EOPNOTSUPP;
1335: break;
1336:
1337: case PRU_CONNECT:
1.31 mycroft 1338: error = in_pcbconnect(inp, nam);
1339: if (error)
1.1 cgd 1340: break;
1.31 mycroft 1341: soisconnected(so);
1.1 cgd 1342: break;
1343:
1344: case PRU_CONNECT2:
1345: error = EOPNOTSUPP;
1346: break;
1347:
1348: case PRU_DISCONNECT:
1.31 mycroft 1349: /*soisdisconnected(so);*/
1350: so->so_state &= ~SS_ISCONNECTED; /* XXX */
1.1 cgd 1351: in_pcbdisconnect(inp);
1.34 mycroft 1352: inp->inp_laddr = zeroin_addr; /* XXX */
1.35 mycroft 1353: in_pcbstate(inp, INP_BOUND); /* XXX */
1.1 cgd 1354: break;
1355:
1356: case PRU_SHUTDOWN:
1357: socantsendmore(so);
1358: break;
1359:
1.31 mycroft 1360: case PRU_RCVD:
1361: error = EOPNOTSUPP;
1.1 cgd 1362: break;
1363:
1.31 mycroft 1364: case PRU_SEND:
1.32 mycroft 1365: if (control && control->m_len) {
1366: m_freem(control);
1367: m_freem(m);
1368: error = EINVAL;
1369: break;
1370: }
1.31 mycroft 1371: {
1.35 mycroft 1372: struct in_addr laddr; /* XXX */
1.1 cgd 1373:
1.31 mycroft 1374: if (nam) {
1.35 mycroft 1375: laddr = inp->inp_laddr; /* XXX */
1.31 mycroft 1376: if ((so->so_state & SS_ISCONNECTED) != 0) {
1377: error = EISCONN;
1.32 mycroft 1378: goto die;
1.31 mycroft 1379: }
1380: error = in_pcbconnect(inp, nam);
1.32 mycroft 1381: if (error) {
1382: die:
1383: m_freem(m);
1.31 mycroft 1384: break;
1.32 mycroft 1385: }
1.31 mycroft 1386: } else {
1387: if ((so->so_state & SS_ISCONNECTED) == 0) {
1388: error = ENOTCONN;
1.32 mycroft 1389: goto die;
1.31 mycroft 1390: }
1391: }
1.33 mycroft 1392: error = udp_output(m, inp);
1.31 mycroft 1393: if (nam) {
1394: in_pcbdisconnect(inp);
1.35 mycroft 1395: inp->inp_laddr = laddr; /* XXX */
1396: in_pcbstate(inp, INP_BOUND); /* XXX */
1.31 mycroft 1397: }
1398: }
1.1 cgd 1399: break;
1400:
1401: case PRU_SENSE:
1402: /*
1403: * stat: don't bother with a blocksize.
1404: */
1.31 mycroft 1405: splx(s);
1.1 cgd 1406: return (0);
1407:
1.31 mycroft 1408: case PRU_RCVOOB:
1409: error = EOPNOTSUPP;
1410: break;
1411:
1.1 cgd 1412: case PRU_SENDOOB:
1.32 mycroft 1413: m_freem(control);
1.31 mycroft 1414: m_freem(m);
1.1 cgd 1415: error = EOPNOTSUPP;
1416: break;
1417:
1.31 mycroft 1418: case PRU_SOCKADDR:
1419: in_setsockaddr(inp, nam);
1420: break;
1421:
1422: case PRU_PEERADDR:
1423: in_setpeeraddr(inp, nam);
1424: break;
1.1 cgd 1425:
1426: default:
1427: panic("udp_usrreq");
1428: }
1429:
1430: release:
1.31 mycroft 1431: splx(s);
1.1 cgd 1432: return (error);
1.13 mycroft 1433: }
1434:
1435: /*
1436: * Sysctl for udp variables.
1437: */
1.27 christos 1438: int
1.13 mycroft 1439: udp_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
1440: int *name;
1441: u_int namelen;
1442: void *oldp;
1443: size_t *oldlenp;
1444: void *newp;
1445: size_t newlen;
1446: {
1447: /* All sysctl names at this level are terminal. */
1448: if (namelen != 1)
1449: return (ENOTDIR);
1450:
1451: switch (name[0]) {
1452: case UDPCTL_CHECKSUM:
1453: return (sysctl_int(oldp, oldlenp, newp, newlen, &udpcksum));
1.42 thorpej 1454: case UDPCTL_SENDSPACE:
1455: return (sysctl_int(oldp, oldlenp, newp, newlen,
1456: &udp_sendspace));
1457: case UDPCTL_RECVSPACE:
1458: return (sysctl_int(oldp, oldlenp, newp, newlen,
1459: &udp_recvspace));
1.13 mycroft 1460: default:
1461: return (ENOPROTOOPT);
1462: }
1463: /* NOTREACHED */
1.1 cgd 1464: }
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