Annotation of src/sys/netinet/udp_usrreq.c, Revision 1.75
1.75 ! itojun 1: /* $NetBSD: udp_usrreq.c,v 1.74 2000/12/04 11:24:20 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"
1.64 ws 68: #include "opt_ipkdb.h"
1.1 cgd 69:
1.5 mycroft 70: #include <sys/param.h>
71: #include <sys/malloc.h>
72: #include <sys/mbuf.h>
73: #include <sys/protosw.h>
74: #include <sys/socket.h>
75: #include <sys/socketvar.h>
1.13 mycroft 76: #include <sys/errno.h>
1.5 mycroft 77: #include <sys/stat.h>
1.27 christos 78: #include <sys/systm.h>
79: #include <sys/proc.h>
1.53 itojun 80: #include <sys/domain.h>
1.27 christos 81:
1.67 mrg 82: #include <uvm/uvm_extern.h>
1.27 christos 83: #include <sys/sysctl.h>
1.1 cgd 84:
1.5 mycroft 85: #include <net/if.h>
86: #include <net/route.h>
1.1 cgd 87:
1.5 mycroft 88: #include <netinet/in.h>
89: #include <netinet/in_systm.h>
1.15 cgd 90: #include <netinet/in_var.h>
1.5 mycroft 91: #include <netinet/ip.h>
92: #include <netinet/in_pcb.h>
93: #include <netinet/ip_var.h>
94: #include <netinet/ip_icmp.h>
95: #include <netinet/udp.h>
96: #include <netinet/udp_var.h>
1.1 cgd 97:
1.53 itojun 98: #ifdef INET6
99: #include <netinet/ip6.h>
100: #include <netinet/icmp6.h>
101: #include <netinet6/ip6_var.h>
102: #include <netinet6/in6_pcb.h>
103: #include <netinet6/udp6_var.h>
104: #endif
105:
106: #ifdef PULLDOWN_TEST
107: #ifndef INET6
108: /* always need ip6.h for IP6_EXTHDR_GET */
109: #include <netinet/ip6.h>
110: #endif
111: #endif
112:
1.27 christos 113: #include <machine/stdarg.h>
114:
1.48 itojun 115: #ifdef IPSEC
116: #include <netinet6/ipsec.h>
117: #include <netkey/key.h>
118: #endif /*IPSEC*/
119:
1.64 ws 120: #ifdef IPKDB
121: #include <ipkdb/ipkdb.h>
122: #endif
123:
1.8 mycroft 124: /*
125: * UDP protocol implementation.
126: * Per RFC 768, August, 1980.
127: */
128: #ifndef COMPAT_42
129: int udpcksum = 1;
130: #else
131: int udpcksum = 0; /* XXX */
132: #endif
133:
1.72 itojun 134: #ifdef INET
1.53 itojun 135: static void udp4_sendup __P((struct mbuf *, int, struct sockaddr *,
136: struct socket *));
137: static int udp4_realinput __P((struct sockaddr_in *, struct sockaddr_in *,
138: struct mbuf *, int));
1.72 itojun 139: #endif
1.53 itojun 140: #ifdef INET6
141: static void udp6_sendup __P((struct mbuf *, int, struct sockaddr *,
142: struct socket *));
143: static int in6_mcmatch __P((struct in6pcb *, struct in6_addr *,
144: struct ifnet *));
145: static int udp6_realinput __P((int, struct sockaddr_in6 *,
146: struct sockaddr_in6 *, struct mbuf *, int));
147: #endif
1.72 itojun 148: #ifdef INET
1.13 mycroft 149: static void udp_notify __P((struct inpcb *, int));
1.72 itojun 150: #endif
1.7 mycroft 151:
1.26 mycroft 152: #ifndef UDBHASHSIZE
153: #define UDBHASHSIZE 128
154: #endif
155: int udbhashsize = UDBHASHSIZE;
156:
1.7 mycroft 157: void
1.1 cgd 158: udp_init()
159: {
1.18 mycroft 160:
1.72 itojun 161: #ifdef INET
1.35 mycroft 162: in_pcbinit(&udbtable, udbhashsize, udbhashsize);
1.72 itojun 163: #endif
1.1 cgd 164: }
165:
1.56 itojun 166: #ifndef UDP6
1.72 itojun 167: #ifdef INET
1.7 mycroft 168: void
1.27 christos 169: #if __STDC__
170: udp_input(struct mbuf *m, ...)
171: #else
172: udp_input(m, va_alist)
173: struct mbuf *m;
174: va_dcl
175: #endif
1.1 cgd 176: {
1.53 itojun 177: va_list ap;
178: struct sockaddr_in src, dst;
179: struct ip *ip;
180: struct udphdr *uh;
181: int iphlen, proto;
182: int len;
183: int n;
184:
185: va_start(ap, m);
186: iphlen = va_arg(ap, int);
187: proto = va_arg(ap, int);
188: va_end(ap);
189:
190: udpstat.udps_ipackets++;
191:
192: #ifndef PULLDOWN_TEST
193: /*
194: * Strip IP options, if any; should skip this,
195: * make available to user, and use on returned packets,
196: * but we don't yet have a way to check the checksum
197: * with options still present.
198: */
199: if (iphlen > sizeof (struct ip)) {
200: ip_stripoptions(m, (struct mbuf *)0);
201: iphlen = sizeof(struct ip);
202: }
203: #else
204: /*
205: * we may enable the above code if we save and pass IPv4 options
206: * to the userland.
207: */
208: #endif
209:
210: /*
211: * Get IP and UDP header together in first mbuf.
212: */
213: ip = mtod(m, struct ip *);
214: #ifndef PULLDOWN_TEST
215: if (m->m_len < iphlen + sizeof(struct udphdr)) {
216: if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == 0) {
217: udpstat.udps_hdrops++;
218: return;
219: }
220: ip = mtod(m, struct ip *);
221: }
222: uh = (struct udphdr *)((caddr_t)ip + iphlen);
223: #else
224: IP6_EXTHDR_GET(uh, struct udphdr *, m, iphlen, sizeof(struct udphdr));
225: if (uh == NULL) {
226: udpstat.udps_hdrops++;
227: return;
228: }
229: #endif
230:
1.57 itojun 231: /* destination port of 0 is illegal, based on RFC768. */
232: if (uh->uh_dport == 0)
233: goto bad;
234:
1.53 itojun 235: /*
236: * Make mbuf data length reflect UDP length.
237: * If not enough data to reflect UDP length, drop.
238: */
239: len = ntohs((u_int16_t)uh->uh_ulen);
240: if (ip->ip_len != iphlen + len) {
1.70 sommerfe 241: if (ip->ip_len < iphlen + len || len < sizeof(struct udphdr)) {
1.53 itojun 242: udpstat.udps_badlen++;
243: goto bad;
244: }
245: m_adj(m, iphlen + len - ip->ip_len);
246: }
247:
248: /*
249: * Checksum extended UDP header and data.
250: */
251: if (uh->uh_sum) {
252: if (in4_cksum(m, IPPROTO_UDP, iphlen, len) != 0) {
253: udpstat.udps_badsum++;
254: m_freem(m);
255: return;
256: }
257: }
258:
259: /* construct source and dst sockaddrs. */
260: bzero(&src, sizeof(src));
261: src.sin_family = AF_INET;
262: src.sin_len = sizeof(struct sockaddr_in);
263: bcopy(&ip->ip_src, &src.sin_addr, sizeof(src.sin_addr));
264: src.sin_port = uh->uh_sport;
265: bzero(&dst, sizeof(dst));
266: dst.sin_family = AF_INET;
267: dst.sin_len = sizeof(struct sockaddr_in);
268: bcopy(&ip->ip_dst, &dst.sin_addr, sizeof(dst.sin_addr));
269: dst.sin_port = uh->uh_dport;
270:
271: n = udp4_realinput(&src, &dst, m, iphlen);
272: #ifdef INET6
273: if (IN_MULTICAST(ip->ip_dst.s_addr) || n == 0) {
274: struct sockaddr_in6 src6, dst6;
275:
276: bzero(&src6, sizeof(src6));
277: src6.sin6_family = AF_INET6;
278: src6.sin6_len = sizeof(struct sockaddr_in6);
279: src6.sin6_addr.s6_addr[10] = src6.sin6_addr.s6_addr[11] = 0xff;
280: bcopy(&ip->ip_src, &src6.sin6_addr.s6_addr[12],
281: sizeof(ip->ip_src));
282: src6.sin6_port = uh->uh_sport;
283: bzero(&dst6, sizeof(dst6));
284: dst6.sin6_family = AF_INET6;
285: dst6.sin6_len = sizeof(struct sockaddr_in6);
286: dst6.sin6_addr.s6_addr[10] = dst6.sin6_addr.s6_addr[11] = 0xff;
287: bcopy(&ip->ip_dst, &dst6.sin6_addr.s6_addr[12],
288: sizeof(ip->ip_dst));
289: dst6.sin6_port = uh->uh_dport;
290:
291: n += udp6_realinput(AF_INET, &src6, &dst6, m, iphlen);
292: }
293: #endif
294:
295: if (n == 0) {
296: if (m->m_flags & (M_BCAST | M_MCAST)) {
297: udpstat.udps_noportbcast++;
298: goto bad;
299: }
1.61 itojun 300: udpstat.udps_noport++;
1.64 ws 301: #ifdef IPKDB
1.53 itojun 302: if (checkipkdb(&ip->ip_src, uh->uh_sport, uh->uh_dport,
303: m, iphlen + sizeof(struct udphdr),
304: m->m_pkthdr.len - iphlen - sizeof(struct udphdr))) {
305: /*
306: * It was a debugger connect packet,
307: * just drop it now
308: */
309: goto bad;
310: }
311: #endif
312: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
313: m = NULL;
314: }
315:
316: bad:
317: if (m)
318: m_freem(m);
319: }
1.72 itojun 320: #endif
1.53 itojun 321:
322: #ifdef INET6
323: int
324: udp6_input(mp, offp, proto)
325: struct mbuf **mp;
326: int *offp, proto;
327: {
328: struct mbuf *m = *mp;
329: int off = *offp;
330: struct sockaddr_in6 src, dst;
331: struct ip6_hdr *ip6;
332: struct udphdr *uh;
333: u_int32_t plen, ulen;
334:
335: #if defined(NFAITH) && 0 < NFAITH
336: if (m->m_pkthdr.rcvif) {
337: if (m->m_pkthdr.rcvif->if_type == IFT_FAITH) {
338: /* send icmp6 host unreach? */
339: m_freem(m);
340: return IPPROTO_DONE;
341: }
342: }
343: #endif
344:
345: udp6stat.udp6s_ipackets++;
346:
347: #ifndef PULLDOWN_TEST
348: IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE);
349: #endif
350:
351: ip6 = mtod(m, struct ip6_hdr *);
352: /* check for jumbogram is done in ip6_input. we can trust pkthdr.len */
353: plen = m->m_pkthdr.len - off;
354: #ifndef PULLDOWN_TEST
355: uh = (struct udphdr *)((caddr_t)ip6 + off);
356: #else
357: IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(struct udphdr));
358: if (uh == NULL) {
359: ip6stat.ip6s_tooshort++;
360: return IPPROTO_DONE;
361: }
362: #endif
363: ulen = ntohs((u_short)uh->uh_ulen);
1.69 itojun 364: /*
365: * RFC2675 section 4: jumbograms will have 0 in the UDP header field,
366: * iff payload length > 0xffff.
367: */
1.53 itojun 368: if (ulen == 0 && plen > 0xffff)
369: ulen = plen;
370:
371: if (plen != ulen) {
372: udp6stat.udp6s_badlen++;
1.54 itojun 373: goto bad;
374: }
375:
1.57 itojun 376: /* destination port of 0 is illegal, based on RFC768. */
377: if (uh->uh_dport == 0)
378: goto bad;
379:
1.54 itojun 380: /* Be proactive about malicious use of IPv4 mapped address */
381: if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
382: IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
383: /* XXX stat */
1.53 itojun 384: goto bad;
385: }
386:
387: /*
388: * Checksum extended UDP header and data.
389: */
390: if (uh->uh_sum == 0)
391: udp6stat.udp6s_nosum++;
392: else if (in6_cksum(m, IPPROTO_UDP, off, ulen) != 0) {
393: udp6stat.udp6s_badsum++;
394: goto bad;
395: }
396:
397: /*
398: * Construct source and dst sockaddrs.
399: * Note that ifindex (s6_addr16[1]) is already filled.
400: */
401: bzero(&src, sizeof(src));
402: src.sin6_family = AF_INET6;
403: src.sin6_len = sizeof(struct sockaddr_in6);
1.69 itojun 404: /* KAME hack: recover scopeid */
405: (void)in6_recoverscope(&src, &ip6->ip6_src, m->m_pkthdr.rcvif);
1.53 itojun 406: src.sin6_port = uh->uh_sport;
407: bzero(&dst, sizeof(dst));
408: dst.sin6_family = AF_INET6;
409: dst.sin6_len = sizeof(struct sockaddr_in6);
1.69 itojun 410: /* KAME hack: recover scopeid */
411: (void)in6_recoverscope(&dst, &ip6->ip6_dst, m->m_pkthdr.rcvif);
1.53 itojun 412: dst.sin6_port = uh->uh_dport;
413:
414: if (udp6_realinput(AF_INET6, &src, &dst, m, off) == 0) {
415: if (m->m_flags & M_MCAST) {
416: udp6stat.udp6s_noportmcast++;
417: goto bad;
418: }
1.61 itojun 419: udp6stat.udp6s_noport++;
1.53 itojun 420: icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
421: m = NULL;
422: }
423:
424: bad:
425: if (m)
426: m_freem(m);
427: return IPPROTO_DONE;
428: }
429: #endif
430:
1.72 itojun 431: #ifdef INET
1.53 itojun 432: static void
433: udp4_sendup(m, off, src, so)
434: struct mbuf *m;
435: int off; /* offset of data portion */
436: struct sockaddr *src;
437: struct socket *so;
438: {
439: struct mbuf *opts = NULL;
440: struct mbuf *n;
441: struct inpcb *inp = NULL;
442: #ifdef INET6
443: struct in6pcb *in6p = NULL;
444: #endif
445:
446: if (!so)
447: return;
448: switch (so->so_proto->pr_domain->dom_family) {
449: case AF_INET:
450: inp = sotoinpcb(so);
451: break;
452: #ifdef INET6
453: case AF_INET6:
454: in6p = sotoin6pcb(so);
455: break;
456: #endif
457: default:
458: return;
459: }
460:
461: #ifdef IPSEC
462: /* check AH/ESP integrity. */
463: if (so != NULL && ipsec4_in_reject_so(m, so)) {
464: ipsecstat.in_polvio++;
465: return;
466: }
467: #endif /*IPSEC*/
468:
469: if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
470: if (inp && (inp->inp_flags & INP_CONTROLOPTS
471: || so->so_options & SO_TIMESTAMP)) {
472: struct ip *ip = mtod(n, struct ip *);
473: ip_savecontrol(inp, &opts, ip, n);
474: }
475:
476: m_adj(n, off);
477: if (sbappendaddr(&so->so_rcv, src, n,
478: opts) == 0) {
479: m_freem(n);
480: if (opts)
481: m_freem(opts);
482: } else
483: sorwakeup(so);
484: }
485: }
1.72 itojun 486: #endif
1.53 itojun 487:
488: #ifdef INET6
489: static void
490: udp6_sendup(m, off, src, so)
491: struct mbuf *m;
492: int off; /* offset of data portion */
493: struct sockaddr *src;
494: struct socket *so;
495: {
496: struct mbuf *opts = NULL;
497: struct mbuf *n;
498: struct in6pcb *in6p = NULL;
499:
500: if (!so)
501: return;
502: if (so->so_proto->pr_domain->dom_family != AF_INET6)
503: return;
504: in6p = sotoin6pcb(so);
505:
506: #ifdef IPSEC
507: /* check AH/ESP integrity. */
508: if (so != NULL && ipsec6_in_reject_so(m, so)) {
509: ipsec6stat.in_polvio++;
510: return;
511: }
512: #endif /*IPSEC*/
513:
514: if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
515: if (in6p && (in6p->in6p_flags & IN6P_CONTROLOPTS
516: || in6p->in6p_socket->so_options & SO_TIMESTAMP)) {
517: struct ip6_hdr *ip6 = mtod(n, struct ip6_hdr *);
518: ip6_savecontrol(in6p, &opts, ip6, n);
519: }
520:
521: m_adj(n, off);
522: if (sbappendaddr(&so->so_rcv, src, n, opts) == 0) {
523: m_freem(n);
524: if (opts)
525: m_freem(opts);
526: udp6stat.udp6s_fullsock++;
527: } else
528: sorwakeup(so);
529: }
530: }
531: #endif
532:
1.72 itojun 533: #ifdef INET
1.53 itojun 534: static int
535: udp4_realinput(src, dst, m, off)
536: struct sockaddr_in *src;
537: struct sockaddr_in *dst;
538: struct mbuf *m;
539: int off; /* offset of udphdr */
540: {
541: u_int16_t *sport, *dport;
542: int rcvcnt;
543: struct in_addr *src4, *dst4;
544: struct inpcb *inp;
545:
546: rcvcnt = 0;
547: off += sizeof(struct udphdr); /* now, offset of payload */
548:
549: if (src->sin_family != AF_INET || dst->sin_family != AF_INET)
550: goto bad;
551:
552: src4 = &src->sin_addr;
553: sport = &src->sin_port;
554: dst4 = &dst->sin_addr;
555: dport = &dst->sin_port;
556:
1.73 itojun 557: if (IN_MULTICAST(dst4->s_addr) ||
1.53 itojun 558: in_broadcast(*dst4, m->m_pkthdr.rcvif)) {
559: struct inpcb *last;
560: /*
561: * Deliver a multicast or broadcast datagram to *all* sockets
562: * for which the local and remote addresses and ports match
563: * those of the incoming datagram. This allows more than
564: * one process to receive multi/broadcasts on the same port.
565: * (This really ought to be done for unicast datagrams as
566: * well, but that would cause problems with existing
567: * applications that open both address-specific sockets and
568: * a wildcard socket listening to the same port -- they would
569: * end up receiving duplicates of every unicast datagram.
570: * Those applications open the multiple sockets to overcome an
571: * inadequacy of the UDP socket interface, but for backwards
572: * compatibility we avoid the problem here rather than
573: * fixing the interface. Maybe 4.5BSD will remedy this?)
574: */
575:
576: /*
577: * KAME note: usually we drop udpiphdr from mbuf here.
1.71 itojun 578: * we need udpiphdr for IPsec processing so we do that later.
1.53 itojun 579: */
580: /*
581: * Locate pcb(s) for datagram.
582: */
583: for (inp = udbtable.inpt_queue.cqh_first;
584: inp != (struct inpcb *)&udbtable.inpt_queue;
585: inp = inp->inp_queue.cqe_next) {
586: if (inp->inp_lport != *dport)
587: continue;
588: if (!in_nullhost(inp->inp_laddr)) {
589: if (!in_hosteq(inp->inp_laddr, *dst4))
590: continue;
591: }
592: if (!in_nullhost(inp->inp_faddr)) {
593: if (!in_hosteq(inp->inp_faddr, *src4) ||
594: inp->inp_fport != *sport)
595: continue;
596: }
597:
598: last = inp;
599: udp4_sendup(m, off, (struct sockaddr *)src,
600: inp->inp_socket);
601: rcvcnt++;
602:
603: /*
604: * Don't look for additional matches if this one does
605: * not have either the SO_REUSEPORT or SO_REUSEADDR
606: * socket options set. This heuristic avoids searching
607: * through all pcbs in the common case of a non-shared
608: * port. It assumes that an application will never
609: * clear these options after setting them.
610: */
611: if ((inp->inp_socket->so_options &
612: (SO_REUSEPORT|SO_REUSEADDR)) == 0)
613: break;
614: }
615:
616: #if 0
617: if (last == NULL) {
618: /*
619: * No matching pcb found; discard datagram.
620: * (No need to send an ICMP Port Unreachable
621: * for a broadcast or multicast datgram.)
622: */
623: udpstat.udps_noportbcast++;
624: goto bad;
625: }
626: #endif
627: } else {
628: /*
629: * Locate pcb for datagram.
630: */
631: inp = in_pcblookup_connect(&udbtable, *src4, *sport, *dst4, *dport);
632: if (inp == 0) {
633: ++udpstat.udps_pcbhashmiss;
634: inp = in_pcblookup_bind(&udbtable, *dst4, *dport);
635: if (inp == 0) {
636: #if 0
637: struct mbuf *n;
638:
639: if (m->m_flags & (M_BCAST | M_MCAST)) {
640: udpstat.udps_noportbcast++;
641: goto bad;
642: }
1.61 itojun 643: udpstat.udps_noport++;
1.64 ws 644: #ifdef IPKDB
1.53 itojun 645: if (checkipkdb(src4, *sport, *dport, m, off,
646: m->m_pkthdr.len - off)) {
647: /*
648: * It was a debugger connect packet,
649: * just drop it now
650: */
651: goto bad;
652: }
653: #endif
654: if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
655: icmp_error(n, ICMP_UNREACH,
656: ICMP_UNREACH_PORT, 0, 0);
657: }
658: #endif
659: return rcvcnt;
660: }
661: }
662:
663: udp4_sendup(m, off, (struct sockaddr *)src, inp->inp_socket);
664: rcvcnt++;
665: }
666:
667: bad:
668: return rcvcnt;
669: }
1.72 itojun 670: #endif
1.53 itojun 671:
672: #ifdef INET6
673: static int
674: in6_mcmatch(in6p, ia6, ifp)
675: struct in6pcb *in6p;
1.66 augustss 676: struct in6_addr *ia6;
1.53 itojun 677: struct ifnet *ifp;
678: {
679: struct ip6_moptions *im6o = in6p->in6p_moptions;
680: struct in6_multi_mship *imm;
681:
682: if (im6o == NULL)
683: return 0;
684:
685: for (imm = im6o->im6o_memberships.lh_first; imm != NULL;
686: imm = imm->i6mm_chain.le_next) {
687: if ((ifp == NULL ||
688: imm->i6mm_maddr->in6m_ifp == ifp) &&
689: IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr,
690: ia6))
691: return 1;
692: }
693: return 0;
694: }
695:
696: static int
697: udp6_realinput(af, src, dst, m, off)
698: int af; /* af on packet */
699: struct sockaddr_in6 *src;
700: struct sockaddr_in6 *dst;
701: struct mbuf *m;
702: int off; /* offset of udphdr */
703: {
704: u_int16_t *sport, *dport;
705: int rcvcnt;
706: struct in6_addr *src6, *dst6;
1.74 itojun 707: struct in_addr *dst4;
1.53 itojun 708: struct in6pcb *in6p;
709:
710: rcvcnt = 0;
711: off += sizeof(struct udphdr); /* now, offset of payload */
712:
713: if (af != AF_INET && af != AF_INET6)
714: goto bad;
715: if (src->sin6_family != AF_INET6 || dst->sin6_family != AF_INET6)
716: goto bad;
717:
718: src6 = &src->sin6_addr;
719: sport = &src->sin6_port;
720: dst6 = &dst->sin6_addr;
721: dport = &dst->sin6_port;
1.74 itojun 722: dst4 = (struct in_addr *)&dst->sin6_addr.s6_addr32[12];
1.53 itojun 723:
724: if (IN6_IS_ADDR_MULTICAST(dst6)
1.73 itojun 725: || (af == AF_INET && IN_MULTICAST(dst4->s_addr))) {
1.53 itojun 726: struct in6pcb *last;
727: /*
728: * Deliver a multicast or broadcast datagram to *all* sockets
729: * for which the local and remote addresses and ports match
730: * those of the incoming datagram. This allows more than
731: * one process to receive multi/broadcasts on the same port.
732: * (This really ought to be done for unicast datagrams as
733: * well, but that would cause problems with existing
734: * applications that open both address-specific sockets and
735: * a wildcard socket listening to the same port -- they would
736: * end up receiving duplicates of every unicast datagram.
737: * Those applications open the multiple sockets to overcome an
738: * inadequacy of the UDP socket interface, but for backwards
739: * compatibility we avoid the problem here rather than
740: * fixing the interface. Maybe 4.5BSD will remedy this?)
741: */
742:
743: /*
744: * KAME note: usually we drop udpiphdr from mbuf here.
1.71 itojun 745: * we need udpiphdr for IPsec processing so we do that later.
1.53 itojun 746: */
747: /*
748: * Locate pcb(s) for datagram.
749: */
750: for (in6p = udb6.in6p_next; in6p != &udb6;
751: in6p = in6p->in6p_next) {
752: if (in6p->in6p_lport != *dport)
753: continue;
754: if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
755: if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, dst6)
756: && !in6_mcmatch(in6p, dst6, m->m_pkthdr.rcvif))
757: continue;
758: }
1.55 itojun 759: #ifndef INET6_BINDV6ONLY
760: else {
761: if (IN6_IS_ADDR_V4MAPPED(dst6)
762: && (in6p->in6p_flags & IN6P_BINDV6ONLY))
763: continue;
764: }
765: #endif
1.53 itojun 766: if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
767: if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, src6)
768: || in6p->in6p_fport != *sport)
769: continue;
770: }
1.55 itojun 771: #ifndef INET6_BINDV6ONLY
772: else {
773: if (IN6_IS_ADDR_V4MAPPED(src6)
774: && (in6p->in6p_flags & IN6P_BINDV6ONLY))
775: continue;
776: }
777: #endif
1.53 itojun 778:
779: last = in6p;
780: udp6_sendup(m, off, (struct sockaddr *)src,
781: in6p->in6p_socket);
782: rcvcnt++;
783:
784: /*
785: * Don't look for additional matches if this one does
786: * not have either the SO_REUSEPORT or SO_REUSEADDR
787: * socket options set. This heuristic avoids searching
788: * through all pcbs in the common case of a non-shared
789: * port. It assumes that an application will never
790: * clear these options after setting them.
791: */
792: if ((in6p->in6p_socket->so_options &
793: (SO_REUSEPORT|SO_REUSEADDR)) == 0)
794: break;
795: }
796:
797: #if 0
798: if (last == NULL) {
799: /*
800: * No matching pcb found; discard datagram.
801: * (No need to send an ICMP Port Unreachable
802: * for a broadcast or multicast datgram.)
803: */
804: switch (af) {
805: case AF_INET:
806: udpstat.udps_noportbcast++;
807: break;
808: case AF_INET6:
809: udp6stat.udp6s_noportmcast++;
810: break;
811: }
812: goto bad;
813: }
814: #endif
815: } else {
816: /*
817: * Locate pcb for datagram.
818: */
819: in6p = in6_pcblookup_connect(&udb6, src6, *sport,
820: dst6, *dport, 0);
821: if (in6p == 0) {
822: ++udpstat.udps_pcbhashmiss;
823: in6p = in6_pcblookup_bind(&udb6, dst6, *dport, 0);
824: if (in6p == 0) {
825: #if 0
826: struct mbuf *n;
827: n = m_copy(m, 0, M_COPYALL);
828: switch (af) {
829: case AF_INET:
830: if (m->m_flags & (M_BCAST | M_MCAST)) {
831: udpstat.udps_noportbcast++;
832: goto bad;
833: }
1.61 itojun 834: udpstat.udps_noport++;
1.53 itojun 835: if (n != NULL)
836: icmp_error(n, ICMP_UNREACH,
837: ICMP_UNREACH_PORT, 0, 0);
838: break;
839: case AF_INET6:
840: if (m->m_flags & M_MCAST) {
841: udp6stat.udp6s_noportmcast++;
842: goto bad;
843: }
1.61 itojun 844: udp6stat.udp6s_noport++;
1.53 itojun 845: if (n != NULL)
846: icmp6_error(n, ICMP6_DST_UNREACH,
847: ICMP6_DST_UNREACH_NOPORT, 0);
848: break;
849: }
850: #endif
851:
852: return rcvcnt;
853: }
854: }
855:
856: udp6_sendup(m, off, (struct sockaddr *)src, in6p->in6p_socket);
857: rcvcnt++;
858: }
859:
860: bad:
861: return rcvcnt;
862: }
863: #endif
864:
1.56 itojun 865: #else /*UDP6*/
866:
1.53 itojun 867: void
868: #if __STDC__
869: udp_input(struct mbuf *m, ...)
870: #else
871: udp_input(m, va_alist)
872: struct mbuf *m;
873: va_dcl
874: #endif
875: {
1.48 itojun 876: int proto;
1.66 augustss 877: struct ip *ip;
878: struct udphdr *uh;
879: struct inpcb *inp;
1.1 cgd 880: struct mbuf *opts = 0;
881: int len;
882: struct ip save_ip;
1.27 christos 883: int iphlen;
884: va_list ap;
1.34 mycroft 885: struct sockaddr_in udpsrc;
1.48 itojun 886: struct sockaddr *sa;
1.27 christos 887:
888: va_start(ap, m);
889: iphlen = va_arg(ap, int);
1.48 itojun 890: proto = va_arg(ap, int);
1.27 christos 891: va_end(ap);
1.1 cgd 892:
893: udpstat.udps_ipackets++;
894:
895: /*
896: * Strip IP options, if any; should skip this,
897: * make available to user, and use on returned packets,
898: * but we don't yet have a way to check the checksum
899: * with options still present.
900: */
901: if (iphlen > sizeof (struct ip)) {
902: ip_stripoptions(m, (struct mbuf *)0);
903: iphlen = sizeof(struct ip);
904: }
905:
906: /*
907: * Get IP and UDP header together in first mbuf.
908: */
909: ip = mtod(m, struct ip *);
910: if (m->m_len < iphlen + sizeof(struct udphdr)) {
911: if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == 0) {
912: udpstat.udps_hdrops++;
913: return;
914: }
915: ip = mtod(m, struct ip *);
916: }
917: uh = (struct udphdr *)((caddr_t)ip + iphlen);
1.57 itojun 918:
919: /* destination port of 0 is illegal, based on RFC768. */
920: if (uh->uh_dport == 0)
921: goto bad;
1.1 cgd 922:
923: /*
924: * Make mbuf data length reflect UDP length.
925: * If not enough data to reflect UDP length, drop.
926: */
1.15 cgd 927: len = ntohs((u_int16_t)uh->uh_ulen);
1.47 mycroft 928: if (ip->ip_len != iphlen + len) {
1.70 sommerfe 929: if (ip->ip_len < iphlen + len || len < sizeof(struct udphdr)) {
1.1 cgd 930: udpstat.udps_badlen++;
931: goto bad;
932: }
1.47 mycroft 933: m_adj(m, iphlen + len - ip->ip_len);
1.1 cgd 934: }
935: /*
936: * Save a copy of the IP header in case we want restore it
937: * for sending an ICMP error message in response.
938: */
939: save_ip = *ip;
940:
941: /*
942: * Checksum extended UDP header and data.
943: */
1.29 mrg 944: if (uh->uh_sum) {
1.25 cgd 945: bzero(((struct ipovly *)ip)->ih_x1,
946: sizeof ((struct ipovly *)ip)->ih_x1);
1.1 cgd 947: ((struct ipovly *)ip)->ih_len = uh->uh_ulen;
1.46 mycroft 948: if (in_cksum(m, len + sizeof (struct ip)) != 0) {
1.1 cgd 949: udpstat.udps_badsum++;
950: m_freem(m);
951: return;
952: }
953: }
1.13 mycroft 954:
1.48 itojun 955: /*
956: * Construct sockaddr format source address.
957: */
958: udpsrc.sin_family = AF_INET;
959: udpsrc.sin_len = sizeof(struct sockaddr_in);
960: udpsrc.sin_addr = ip->ip_src;
961: udpsrc.sin_port = uh->uh_sport;
962: bzero((caddr_t)udpsrc.sin_zero, sizeof(udpsrc.sin_zero));
963:
1.16 mycroft 964: if (IN_MULTICAST(ip->ip_dst.s_addr) ||
1.13 mycroft 965: in_broadcast(ip->ip_dst, m->m_pkthdr.rcvif)) {
1.40 thorpej 966: struct inpcb *last;
1.4 hpeyerl 967: /*
968: * Deliver a multicast or broadcast datagram to *all* sockets
969: * for which the local and remote addresses and ports match
970: * those of the incoming datagram. This allows more than
971: * one process to receive multi/broadcasts on the same port.
972: * (This really ought to be done for unicast datagrams as
973: * well, but that would cause problems with existing
974: * applications that open both address-specific sockets and
975: * a wildcard socket listening to the same port -- they would
976: * end up receiving duplicates of every unicast datagram.
977: * Those applications open the multiple sockets to overcome an
978: * inadequacy of the UDP socket interface, but for backwards
979: * compatibility we avoid the problem here rather than
1.13 mycroft 980: * fixing the interface. Maybe 4.5BSD will remedy this?)
1.4 hpeyerl 981: */
1.13 mycroft 982:
1.48 itojun 983: iphlen += sizeof(struct udphdr);
1.4 hpeyerl 984: /*
1.48 itojun 985: * KAME note: usually we drop udpiphdr from mbuf here.
1.71 itojun 986: * we need udpiphdr for IPsec processing so we do that later.
1.4 hpeyerl 987: */
988: /*
989: * Locate pcb(s) for datagram.
990: * (Algorithm copied from raw_intr().)
991: */
992: last = NULL;
1.22 cgd 993: for (inp = udbtable.inpt_queue.cqh_first;
994: inp != (struct inpcb *)&udbtable.inpt_queue;
995: inp = inp->inp_queue.cqe_next) {
1.4 hpeyerl 996: if (inp->inp_lport != uh->uh_dport)
997: continue;
1.34 mycroft 998: if (!in_nullhost(inp->inp_laddr)) {
999: if (!in_hosteq(inp->inp_laddr, ip->ip_dst))
1.4 hpeyerl 1000: continue;
1001: }
1.34 mycroft 1002: if (!in_nullhost(inp->inp_faddr)) {
1003: if (!in_hosteq(inp->inp_faddr, ip->ip_src) ||
1.4 hpeyerl 1004: inp->inp_fport != uh->uh_sport)
1005: continue;
1006: }
1007:
1008: if (last != NULL) {
1009: struct mbuf *n;
1010:
1.48 itojun 1011: #ifdef IPSEC
1012: /* check AH/ESP integrity. */
1013: if (last != NULL && ipsec4_in_reject(m, last)) {
1014: ipsecstat.in_polvio++;
1015: /* do not inject data to pcb */
1016: } else
1017: #endif /*IPSEC*/
1.4 hpeyerl 1018: if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
1.40 thorpej 1019: if (last->inp_flags & INP_CONTROLOPTS
1020: || last->inp_socket->so_options &
1021: SO_TIMESTAMP) {
1022: ip_savecontrol(last, &opts,
1023: ip, n);
1024: }
1.49 drochner 1025: m_adj(n, iphlen);
1.48 itojun 1026: sa = (struct sockaddr *)&udpsrc;
1.40 thorpej 1027: if (sbappendaddr(
1028: &last->inp_socket->so_rcv,
1.48 itojun 1029: sa, n, opts) == 0) {
1.4 hpeyerl 1030: m_freem(n);
1.40 thorpej 1031: if (opts)
1032: m_freem(opts);
1.13 mycroft 1033: } else
1.40 thorpej 1034: sorwakeup(last->inp_socket);
1035: opts = 0;
1.4 hpeyerl 1036: }
1037: }
1.40 thorpej 1038: last = inp;
1.4 hpeyerl 1039: /*
1.13 mycroft 1040: * Don't look for additional matches if this one does
1041: * not have either the SO_REUSEPORT or SO_REUSEADDR
1042: * socket options set. This heuristic avoids searching
1043: * through all pcbs in the common case of a non-shared
1044: * port. It * assumes that an application will never
1045: * clear these options after setting them.
1.4 hpeyerl 1046: */
1.40 thorpej 1047: if ((last->inp_socket->so_options &
1048: (SO_REUSEPORT|SO_REUSEADDR)) == 0)
1.4 hpeyerl 1049: break;
1050: }
1.6 mycroft 1051:
1.4 hpeyerl 1052: if (last == NULL) {
1053: /*
1054: * No matching pcb found; discard datagram.
1055: * (No need to send an ICMP Port Unreachable
1056: * for a broadcast or multicast datgram.)
1057: */
1.13 mycroft 1058: udpstat.udps_noportbcast++;
1.4 hpeyerl 1059: goto bad;
1060: }
1.48 itojun 1061: #ifdef IPSEC
1062: /* check AH/ESP integrity. */
1063: if (last != NULL && ipsec4_in_reject(m, last)) {
1064: ipsecstat.in_polvio++;
1065: goto bad;
1066: }
1067: #endif /*IPSEC*/
1.40 thorpej 1068: if (last->inp_flags & INP_CONTROLOPTS ||
1069: last->inp_socket->so_options & SO_TIMESTAMP)
1070: ip_savecontrol(last, &opts, ip, m);
1.49 drochner 1071: m->m_len -= iphlen;
1072: m->m_pkthdr.len -= iphlen;
1073: m->m_data += iphlen;
1.48 itojun 1074: sa = (struct sockaddr *)&udpsrc;
1075: if (sbappendaddr(&last->inp_socket->so_rcv, sa, m, opts) == 0) {
1.13 mycroft 1076: udpstat.udps_fullsock++;
1.4 hpeyerl 1077: goto bad;
1.13 mycroft 1078: }
1.40 thorpej 1079: sorwakeup(last->inp_socket);
1.4 hpeyerl 1080: return;
1081: }
1.1 cgd 1082: /*
1083: * Locate pcb for datagram.
1084: */
1.35 mycroft 1085: inp = in_pcblookup_connect(&udbtable, ip->ip_src, uh->uh_sport,
1.26 mycroft 1086: ip->ip_dst, uh->uh_dport);
1087: if (inp == 0) {
1088: ++udpstat.udps_pcbhashmiss;
1.35 mycroft 1089: inp = in_pcblookup_bind(&udbtable, ip->ip_dst, uh->uh_dport);
1.18 mycroft 1090: if (inp == 0) {
1091: if (m->m_flags & (M_BCAST | M_MCAST)) {
1092: udpstat.udps_noportbcast++;
1093: goto bad;
1094: }
1.61 itojun 1095: udpstat.udps_noport++;
1.18 mycroft 1096: *ip = save_ip;
1.64 ws 1097: #ifdef IPKDB
1.38 ws 1098: if (checkipkdb(&ip->ip_src,
1099: uh->uh_sport,
1100: uh->uh_dport,
1101: m,
1102: iphlen + sizeof(struct udphdr),
1103: len - sizeof(struct udphdr)))
1.37 ws 1104: /* It was a debugger connect packet, just drop it now */
1105: goto bad;
1106: #endif
1.18 mycroft 1107: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
1108: return;
1.13 mycroft 1109: }
1.1 cgd 1110: }
1.48 itojun 1111: #ifdef IPSEC
1112: if (inp != NULL && ipsec4_in_reject(m, inp)) {
1113: ipsecstat.in_polvio++;
1114: goto bad;
1115: }
1116: #endif /*IPSEC*/
1.1 cgd 1117:
1118: /*
1119: * Stuff source address and datagram in user buffer.
1120: */
1.40 thorpej 1121: if (inp->inp_flags & INP_CONTROLOPTS ||
1122: inp->inp_socket->so_options & SO_TIMESTAMP)
1123: ip_savecontrol(inp, &opts, ip, m);
1.1 cgd 1124: iphlen += sizeof(struct udphdr);
1125: m->m_len -= iphlen;
1126: m->m_pkthdr.len -= iphlen;
1127: m->m_data += iphlen;
1.48 itojun 1128: sa = (struct sockaddr *)&udpsrc;
1129: if (sbappendaddr(&inp->inp_socket->so_rcv, sa, m, opts) == 0) {
1.1 cgd 1130: udpstat.udps_fullsock++;
1131: goto bad;
1132: }
1133: sorwakeup(inp->inp_socket);
1134: return;
1135: bad:
1136: m_freem(m);
1137: if (opts)
1138: m_freem(opts);
1139: }
1.56 itojun 1140: #endif /*UDP6*/
1.1 cgd 1141:
1.72 itojun 1142: #ifdef INET
1.1 cgd 1143: /*
1144: * Notify a udp user of an asynchronous error;
1145: * just wake up so that he can collect error status.
1146: */
1.7 mycroft 1147: static void
1.1 cgd 1148: udp_notify(inp, errno)
1.66 augustss 1149: struct inpcb *inp;
1.7 mycroft 1150: int errno;
1.1 cgd 1151: {
1.34 mycroft 1152:
1.1 cgd 1153: inp->inp_socket->so_error = errno;
1154: sorwakeup(inp->inp_socket);
1155: sowwakeup(inp->inp_socket);
1156: }
1157:
1.27 christos 1158: void *
1159: udp_ctlinput(cmd, sa, v)
1.1 cgd 1160: int cmd;
1161: struct sockaddr *sa;
1.27 christos 1162: void *v;
1.1 cgd 1163: {
1.66 augustss 1164: struct ip *ip = v;
1165: struct udphdr *uh;
1.18 mycroft 1166: void (*notify) __P((struct inpcb *, int)) = udp_notify;
1.21 mycroft 1167: int errno;
1.1 cgd 1168:
1.53 itojun 1169: if (sa->sa_family != AF_INET
1170: || sa->sa_len != sizeof(struct sockaddr_in))
1.51 itojun 1171: return NULL;
1.20 mycroft 1172: if ((unsigned)cmd >= PRC_NCMDS)
1.27 christos 1173: return NULL;
1.20 mycroft 1174: errno = inetctlerrmap[cmd];
1.18 mycroft 1175: if (PRC_IS_REDIRECT(cmd))
1.19 mycroft 1176: notify = in_rtchange, ip = 0;
1.18 mycroft 1177: else if (cmd == PRC_HOSTDEAD)
1.19 mycroft 1178: ip = 0;
1.23 cgd 1179: else if (errno == 0)
1.27 christos 1180: return NULL;
1.19 mycroft 1181: if (ip) {
1.1 cgd 1182: uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
1.34 mycroft 1183: in_pcbnotify(&udbtable, satosin(sa)->sin_addr, uh->uh_dport,
1184: ip->ip_src, uh->uh_sport, errno, notify);
1.53 itojun 1185:
1186: /* XXX mapped address case */
1.19 mycroft 1187: } else
1.34 mycroft 1188: in_pcbnotifyall(&udbtable, satosin(sa)->sin_addr, errno,
1189: notify);
1.27 christos 1190: return NULL;
1.1 cgd 1191: }
1192:
1.7 mycroft 1193: int
1.27 christos 1194: #if __STDC__
1195: udp_output(struct mbuf *m, ...)
1196: #else
1197: udp_output(m, va_alist)
1198: struct mbuf *m;
1199: va_dcl
1200: #endif
1201: {
1.66 augustss 1202: struct inpcb *inp;
1203: struct udpiphdr *ui;
1204: int len = m->m_pkthdr.len;
1.31 mycroft 1205: int error = 0;
1.27 christos 1206: va_list ap;
1207:
1208: va_start(ap, m);
1209: inp = va_arg(ap, struct inpcb *);
1210: va_end(ap);
1.1 cgd 1211:
1212: /*
1213: * Calculate data length and get a mbuf
1214: * for UDP and IP headers.
1215: */
1.13 mycroft 1216: M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT);
1217: if (m == 0) {
1218: error = ENOBUFS;
1.39 thorpej 1219: goto release;
1220: }
1221:
1222: /*
1223: * Compute the packet length of the IP header, and
1224: * punt if the length looks bogus.
1225: */
1226: if ((len + sizeof(struct udpiphdr)) > IP_MAXPACKET) {
1227: error = EMSGSIZE;
1.13 mycroft 1228: goto release;
1229: }
1.1 cgd 1230:
1231: /*
1232: * Fill in mbuf with extended UDP header
1233: * and addresses and length put into network format.
1234: */
1235: ui = mtod(m, struct udpiphdr *);
1.25 cgd 1236: bzero(ui->ui_x1, sizeof ui->ui_x1);
1.1 cgd 1237: ui->ui_pr = IPPROTO_UDP;
1.15 cgd 1238: ui->ui_len = htons((u_int16_t)len + sizeof (struct udphdr));
1.1 cgd 1239: ui->ui_src = inp->inp_laddr;
1240: ui->ui_dst = inp->inp_faddr;
1241: ui->ui_sport = inp->inp_lport;
1242: ui->ui_dport = inp->inp_fport;
1243: ui->ui_ulen = ui->ui_len;
1244:
1245: /*
1246: * Stuff checksum and output datagram.
1247: */
1248: ui->ui_sum = 0;
1249: if (udpcksum) {
1250: if ((ui->ui_sum = in_cksum(m, sizeof (struct udpiphdr) + len)) == 0)
1251: ui->ui_sum = 0xffff;
1252: }
1253: ((struct ip *)ui)->ip_len = sizeof (struct udpiphdr) + len;
1254: ((struct ip *)ui)->ip_ttl = inp->inp_ip.ip_ttl; /* XXX */
1255: ((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; /* XXX */
1256: udpstat.udps_opackets++;
1.48 itojun 1257:
1258: #ifdef IPSEC
1.75 ! itojun 1259: if (ipsec_setsocket(m, inp->inp_socket) != 0) {
! 1260: error = ENOBUFS;
! 1261: goto release;
! 1262: }
1.48 itojun 1263: #endif /*IPSEC*/
1264:
1.31 mycroft 1265: return (ip_output(m, inp->inp_options, &inp->inp_route,
1.12 mycroft 1266: inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST),
1.31 mycroft 1267: inp->inp_moptions));
1.1 cgd 1268:
1269: release:
1270: m_freem(m);
1271: return (error);
1272: }
1273:
1.42 thorpej 1274: int udp_sendspace = 9216; /* really max datagram size */
1275: int udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in));
1.1 cgd 1276: /* 40 1K datagrams */
1277:
1278: /*ARGSUSED*/
1.7 mycroft 1279: int
1.31 mycroft 1280: udp_usrreq(so, req, m, nam, control, p)
1.1 cgd 1281: struct socket *so;
1282: int req;
1.31 mycroft 1283: struct mbuf *m, *nam, *control;
1.30 mycroft 1284: struct proc *p;
1.1 cgd 1285: {
1.66 augustss 1286: struct inpcb *inp;
1.1 cgd 1287: int s;
1.66 augustss 1288: int error = 0;
1.1 cgd 1289:
1290: if (req == PRU_CONTROL)
1.31 mycroft 1291: return (in_control(so, (long)m, (caddr_t)nam,
1.30 mycroft 1292: (struct ifnet *)control, p));
1.59 thorpej 1293:
1.60 thorpej 1294: if (req == PRU_PURGEIF) {
1295: in_purgeif((struct ifnet *)control);
1296: in_pcbpurgeif(&udbtable, (struct ifnet *)control);
1.59 thorpej 1297: return (0);
1298: }
1.31 mycroft 1299:
1300: s = splsoftnet();
1301: inp = sotoinpcb(so);
1.32 mycroft 1302: #ifdef DIAGNOSTIC
1303: if (req != PRU_SEND && req != PRU_SENDOOB && control)
1304: panic("udp_usrreq: unexpected control mbuf");
1305: #endif
1.31 mycroft 1306: if (inp == 0 && req != PRU_ATTACH) {
1307: error = EINVAL;
1308: goto release;
1309: }
1310:
1.1 cgd 1311: /*
1312: * Note: need to block udp_input while changing
1313: * the udp pcb queue and/or pcb addresses.
1314: */
1315: switch (req) {
1316:
1317: case PRU_ATTACH:
1.31 mycroft 1318: if (inp != 0) {
1319: error = EISCONN;
1.1 cgd 1320: break;
1321: }
1.31 mycroft 1322: if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
1323: error = soreserve(so, udp_sendspace, udp_recvspace);
1324: if (error)
1325: break;
1326: }
1.18 mycroft 1327: error = in_pcballoc(so, &udbtable);
1.1 cgd 1328: if (error)
1329: break;
1.31 mycroft 1330: inp = sotoinpcb(so);
1331: inp->inp_ip.ip_ttl = ip_defttl;
1.48 itojun 1332: #ifdef IPSEC
1.58 itojun 1333: error = ipsec_init_policy(so, &inp->inp_sp);
1.53 itojun 1334: if (error != 0) {
1.52 itojun 1335: in_pcbdetach(inp);
1.53 itojun 1336: break;
1337: }
1.48 itojun 1338: #endif /*IPSEC*/
1.1 cgd 1339: break;
1340:
1341: case PRU_DETACH:
1.31 mycroft 1342: in_pcbdetach(inp);
1.1 cgd 1343: break;
1344:
1345: case PRU_BIND:
1.31 mycroft 1346: error = in_pcbbind(inp, nam, p);
1.1 cgd 1347: break;
1348:
1349: case PRU_LISTEN:
1350: error = EOPNOTSUPP;
1351: break;
1352:
1353: case PRU_CONNECT:
1.31 mycroft 1354: error = in_pcbconnect(inp, nam);
1355: if (error)
1.1 cgd 1356: break;
1.31 mycroft 1357: soisconnected(so);
1.1 cgd 1358: break;
1359:
1360: case PRU_CONNECT2:
1361: error = EOPNOTSUPP;
1362: break;
1363:
1364: case PRU_DISCONNECT:
1.31 mycroft 1365: /*soisdisconnected(so);*/
1366: so->so_state &= ~SS_ISCONNECTED; /* XXX */
1.1 cgd 1367: in_pcbdisconnect(inp);
1.34 mycroft 1368: inp->inp_laddr = zeroin_addr; /* XXX */
1.35 mycroft 1369: in_pcbstate(inp, INP_BOUND); /* XXX */
1.1 cgd 1370: break;
1371:
1372: case PRU_SHUTDOWN:
1373: socantsendmore(so);
1374: break;
1375:
1.31 mycroft 1376: case PRU_RCVD:
1377: error = EOPNOTSUPP;
1.1 cgd 1378: break;
1379:
1.31 mycroft 1380: case PRU_SEND:
1.32 mycroft 1381: if (control && control->m_len) {
1382: m_freem(control);
1383: m_freem(m);
1384: error = EINVAL;
1385: break;
1386: }
1.31 mycroft 1387: {
1.35 mycroft 1388: struct in_addr laddr; /* XXX */
1.1 cgd 1389:
1.31 mycroft 1390: if (nam) {
1.35 mycroft 1391: laddr = inp->inp_laddr; /* XXX */
1.31 mycroft 1392: if ((so->so_state & SS_ISCONNECTED) != 0) {
1393: error = EISCONN;
1.32 mycroft 1394: goto die;
1.31 mycroft 1395: }
1396: error = in_pcbconnect(inp, nam);
1.32 mycroft 1397: if (error) {
1398: die:
1399: m_freem(m);
1.31 mycroft 1400: break;
1.32 mycroft 1401: }
1.31 mycroft 1402: } else {
1403: if ((so->so_state & SS_ISCONNECTED) == 0) {
1404: error = ENOTCONN;
1.32 mycroft 1405: goto die;
1.31 mycroft 1406: }
1407: }
1.33 mycroft 1408: error = udp_output(m, inp);
1.31 mycroft 1409: if (nam) {
1410: in_pcbdisconnect(inp);
1.35 mycroft 1411: inp->inp_laddr = laddr; /* XXX */
1412: in_pcbstate(inp, INP_BOUND); /* XXX */
1.31 mycroft 1413: }
1414: }
1.1 cgd 1415: break;
1416:
1417: case PRU_SENSE:
1418: /*
1419: * stat: don't bother with a blocksize.
1420: */
1.31 mycroft 1421: splx(s);
1.1 cgd 1422: return (0);
1423:
1.31 mycroft 1424: case PRU_RCVOOB:
1425: error = EOPNOTSUPP;
1426: break;
1427:
1.1 cgd 1428: case PRU_SENDOOB:
1.32 mycroft 1429: m_freem(control);
1.31 mycroft 1430: m_freem(m);
1.1 cgd 1431: error = EOPNOTSUPP;
1432: break;
1433:
1.31 mycroft 1434: case PRU_SOCKADDR:
1435: in_setsockaddr(inp, nam);
1436: break;
1437:
1438: case PRU_PEERADDR:
1439: in_setpeeraddr(inp, nam);
1440: break;
1.1 cgd 1441:
1442: default:
1443: panic("udp_usrreq");
1444: }
1445:
1446: release:
1.31 mycroft 1447: splx(s);
1.1 cgd 1448: return (error);
1.13 mycroft 1449: }
1450:
1451: /*
1452: * Sysctl for udp variables.
1453: */
1.27 christos 1454: int
1.13 mycroft 1455: udp_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
1456: int *name;
1457: u_int namelen;
1458: void *oldp;
1459: size_t *oldlenp;
1460: void *newp;
1461: size_t newlen;
1462: {
1463: /* All sysctl names at this level are terminal. */
1464: if (namelen != 1)
1465: return (ENOTDIR);
1466:
1467: switch (name[0]) {
1468: case UDPCTL_CHECKSUM:
1469: return (sysctl_int(oldp, oldlenp, newp, newlen, &udpcksum));
1.42 thorpej 1470: case UDPCTL_SENDSPACE:
1471: return (sysctl_int(oldp, oldlenp, newp, newlen,
1472: &udp_sendspace));
1473: case UDPCTL_RECVSPACE:
1474: return (sysctl_int(oldp, oldlenp, newp, newlen,
1475: &udp_recvspace));
1.13 mycroft 1476: default:
1477: return (ENOPROTOOPT);
1478: }
1479: /* NOTREACHED */
1.1 cgd 1480: }
1.72 itojun 1481: #endif
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