Annotation of src/sys/netinet/udp_usrreq.c, Revision 1.88
1.88 ! itojun 1: /* $NetBSD: udp_usrreq.c,v 1.87 2001/10/29 07:02:34 simonb 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:
1.77 soda 67: #include "opt_inet.h"
1.50 thorpej 68: #include "opt_ipsec.h"
1.78 thorpej 69: #include "opt_inet_csum.h"
1.64 ws 70: #include "opt_ipkdb.h"
1.1 cgd 71:
1.5 mycroft 72: #include <sys/param.h>
73: #include <sys/malloc.h>
74: #include <sys/mbuf.h>
75: #include <sys/protosw.h>
76: #include <sys/socket.h>
77: #include <sys/socketvar.h>
1.13 mycroft 78: #include <sys/errno.h>
1.5 mycroft 79: #include <sys/stat.h>
1.27 christos 80: #include <sys/systm.h>
81: #include <sys/proc.h>
1.53 itojun 82: #include <sys/domain.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:
1.76 itojun 113: #include "faith.h"
114: #if defined(NFAITH) && NFAITH > 0
115: #include <net/if_faith.h>
116: #endif
117:
1.27 christos 118: #include <machine/stdarg.h>
119:
1.48 itojun 120: #ifdef IPSEC
121: #include <netinet6/ipsec.h>
122: #include <netkey/key.h>
123: #endif /*IPSEC*/
124:
1.64 ws 125: #ifdef IPKDB
126: #include <ipkdb/ipkdb.h>
127: #endif
128:
1.8 mycroft 129: /*
130: * UDP protocol implementation.
131: * Per RFC 768, August, 1980.
132: */
133: #ifndef COMPAT_42
134: int udpcksum = 1;
135: #else
136: int udpcksum = 0; /* XXX */
137: #endif
138:
1.72 itojun 139: #ifdef INET
1.53 itojun 140: static void udp4_sendup __P((struct mbuf *, int, struct sockaddr *,
141: struct socket *));
142: static int udp4_realinput __P((struct sockaddr_in *, struct sockaddr_in *,
143: struct mbuf *, int));
1.72 itojun 144: #endif
1.53 itojun 145: #ifdef INET6
146: static void udp6_sendup __P((struct mbuf *, int, struct sockaddr *,
147: struct socket *));
148: static int in6_mcmatch __P((struct in6pcb *, struct in6_addr *,
149: struct ifnet *));
150: static int udp6_realinput __P((int, struct sockaddr_in6 *,
151: struct sockaddr_in6 *, struct mbuf *, int));
152: #endif
1.72 itojun 153: #ifdef INET
1.13 mycroft 154: static void udp_notify __P((struct inpcb *, int));
1.72 itojun 155: #endif
1.7 mycroft 156:
1.26 mycroft 157: #ifndef UDBHASHSIZE
158: #define UDBHASHSIZE 128
159: #endif
160: int udbhashsize = UDBHASHSIZE;
161:
1.78 thorpej 162: #ifdef UDP_CSUM_COUNTERS
163: #include <sys/device.h>
164:
165: struct evcnt udp_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
166: NULL, "udp", "hwcsum bad");
167: struct evcnt udp_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
168: NULL, "udp", "hwcsum ok");
169: struct evcnt udp_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
170: NULL, "udp", "hwcsum data");
171: struct evcnt udp_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
172: NULL, "udp", "swcsum");
173:
174: #define UDP_CSUM_COUNTER_INCR(ev) (ev)->ev_count++
175:
176: #else
177:
178: #define UDP_CSUM_COUNTER_INCR(ev) /* nothing */
179:
180: #endif /* UDP_CSUM_COUNTERS */
181:
1.7 mycroft 182: void
1.1 cgd 183: udp_init()
184: {
1.18 mycroft 185:
1.72 itojun 186: #ifdef INET
1.35 mycroft 187: in_pcbinit(&udbtable, udbhashsize, udbhashsize);
1.72 itojun 188: #endif
1.78 thorpej 189:
190: #ifdef UDP_CSUM_COUNTERS
191: evcnt_attach_static(&udp_hwcsum_bad);
192: evcnt_attach_static(&udp_hwcsum_ok);
193: evcnt_attach_static(&udp_hwcsum_data);
194: evcnt_attach_static(&udp_swcsum);
195: #endif /* UDP_CSUM_COUNTERS */
1.1 cgd 196: }
197:
1.72 itojun 198: #ifdef INET
1.7 mycroft 199: void
1.27 christos 200: #if __STDC__
201: udp_input(struct mbuf *m, ...)
202: #else
203: udp_input(m, va_alist)
204: struct mbuf *m;
205: va_dcl
206: #endif
1.1 cgd 207: {
1.53 itojun 208: va_list ap;
209: struct sockaddr_in src, dst;
210: struct ip *ip;
211: struct udphdr *uh;
212: int iphlen, proto;
213: int len;
214: int n;
215:
216: va_start(ap, m);
217: iphlen = va_arg(ap, int);
218: proto = va_arg(ap, int);
219: va_end(ap);
220:
221: udpstat.udps_ipackets++;
222:
223: #ifndef PULLDOWN_TEST
224: /*
225: * Strip IP options, if any; should skip this,
226: * make available to user, and use on returned packets,
227: * but we don't yet have a way to check the checksum
228: * with options still present.
229: */
230: if (iphlen > sizeof (struct ip)) {
231: ip_stripoptions(m, (struct mbuf *)0);
232: iphlen = sizeof(struct ip);
233: }
234: #else
235: /*
236: * we may enable the above code if we save and pass IPv4 options
237: * to the userland.
238: */
239: #endif
240:
241: /*
242: * Get IP and UDP header together in first mbuf.
243: */
244: ip = mtod(m, struct ip *);
245: #ifndef PULLDOWN_TEST
246: if (m->m_len < iphlen + sizeof(struct udphdr)) {
247: if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == 0) {
248: udpstat.udps_hdrops++;
249: return;
250: }
251: ip = mtod(m, struct ip *);
252: }
253: uh = (struct udphdr *)((caddr_t)ip + iphlen);
254: #else
255: IP6_EXTHDR_GET(uh, struct udphdr *, m, iphlen, sizeof(struct udphdr));
256: if (uh == NULL) {
257: udpstat.udps_hdrops++;
258: return;
259: }
260: #endif
261:
1.57 itojun 262: /* destination port of 0 is illegal, based on RFC768. */
263: if (uh->uh_dport == 0)
264: goto bad;
265:
1.53 itojun 266: /*
267: * Make mbuf data length reflect UDP length.
268: * If not enough data to reflect UDP length, drop.
269: */
270: len = ntohs((u_int16_t)uh->uh_ulen);
271: if (ip->ip_len != iphlen + len) {
1.70 sommerfe 272: if (ip->ip_len < iphlen + len || len < sizeof(struct udphdr)) {
1.53 itojun 273: udpstat.udps_badlen++;
274: goto bad;
275: }
276: m_adj(m, iphlen + len - ip->ip_len);
277: }
278:
279: /*
280: * Checksum extended UDP header and data.
281: */
282: if (uh->uh_sum) {
1.78 thorpej 283: switch (m->m_pkthdr.csum_flags &
1.84 thorpej 284: ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv4) |
1.78 thorpej 285: M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) {
286: case M_CSUM_UDPv4|M_CSUM_TCP_UDP_BAD:
287: UDP_CSUM_COUNTER_INCR(&udp_hwcsum_bad);
288: goto badcsum;
289:
290: case M_CSUM_UDPv4|M_CSUM_DATA:
291: UDP_CSUM_COUNTER_INCR(&udp_hwcsum_data);
292: if ((m->m_pkthdr.csum_data ^ 0xffff) != 0)
293: goto badcsum;
294: break;
295:
296: case M_CSUM_UDPv4:
297: /* Checksum was okay. */
298: UDP_CSUM_COUNTER_INCR(&udp_hwcsum_ok);
299: break;
300:
301: default:
302: /* Need to compute it ourselves. */
303: UDP_CSUM_COUNTER_INCR(&udp_swcsum);
304: if (in4_cksum(m, IPPROTO_UDP, iphlen, len) != 0)
305: goto badcsum;
306: break;
1.53 itojun 307: }
308: }
309:
310: /* construct source and dst sockaddrs. */
311: bzero(&src, sizeof(src));
312: src.sin_family = AF_INET;
313: src.sin_len = sizeof(struct sockaddr_in);
314: bcopy(&ip->ip_src, &src.sin_addr, sizeof(src.sin_addr));
315: src.sin_port = uh->uh_sport;
316: bzero(&dst, sizeof(dst));
317: dst.sin_family = AF_INET;
318: dst.sin_len = sizeof(struct sockaddr_in);
319: bcopy(&ip->ip_dst, &dst.sin_addr, sizeof(dst.sin_addr));
320: dst.sin_port = uh->uh_dport;
321:
322: n = udp4_realinput(&src, &dst, m, iphlen);
323: #ifdef INET6
324: if (IN_MULTICAST(ip->ip_dst.s_addr) || n == 0) {
325: struct sockaddr_in6 src6, dst6;
326:
327: bzero(&src6, sizeof(src6));
328: src6.sin6_family = AF_INET6;
329: src6.sin6_len = sizeof(struct sockaddr_in6);
330: src6.sin6_addr.s6_addr[10] = src6.sin6_addr.s6_addr[11] = 0xff;
331: bcopy(&ip->ip_src, &src6.sin6_addr.s6_addr[12],
332: sizeof(ip->ip_src));
333: src6.sin6_port = uh->uh_sport;
334: bzero(&dst6, sizeof(dst6));
335: dst6.sin6_family = AF_INET6;
336: dst6.sin6_len = sizeof(struct sockaddr_in6);
337: dst6.sin6_addr.s6_addr[10] = dst6.sin6_addr.s6_addr[11] = 0xff;
338: bcopy(&ip->ip_dst, &dst6.sin6_addr.s6_addr[12],
339: sizeof(ip->ip_dst));
340: dst6.sin6_port = uh->uh_dport;
341:
342: n += udp6_realinput(AF_INET, &src6, &dst6, m, iphlen);
343: }
344: #endif
345:
346: if (n == 0) {
347: if (m->m_flags & (M_BCAST | M_MCAST)) {
348: udpstat.udps_noportbcast++;
349: goto bad;
350: }
1.61 itojun 351: udpstat.udps_noport++;
1.64 ws 352: #ifdef IPKDB
1.53 itojun 353: if (checkipkdb(&ip->ip_src, uh->uh_sport, uh->uh_dport,
354: m, iphlen + sizeof(struct udphdr),
355: m->m_pkthdr.len - iphlen - sizeof(struct udphdr))) {
356: /*
357: * It was a debugger connect packet,
358: * just drop it now
359: */
360: goto bad;
361: }
362: #endif
363: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
364: m = NULL;
365: }
366:
367: bad:
368: if (m)
369: m_freem(m);
1.78 thorpej 370: return;
371:
372: badcsum:
373: m_freem(m);
374: udpstat.udps_badsum++;
1.53 itojun 375: }
1.72 itojun 376: #endif
1.53 itojun 377:
378: #ifdef INET6
379: int
380: udp6_input(mp, offp, proto)
381: struct mbuf **mp;
382: int *offp, proto;
383: {
384: struct mbuf *m = *mp;
385: int off = *offp;
386: struct sockaddr_in6 src, dst;
387: struct ip6_hdr *ip6;
388: struct udphdr *uh;
389: u_int32_t plen, ulen;
390:
1.76 itojun 391: #ifndef PULLDOWN_TEST
392: IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE);
393: #endif
394: ip6 = mtod(m, struct ip6_hdr *);
395:
1.53 itojun 396: #if defined(NFAITH) && 0 < NFAITH
1.76 itojun 397: if (faithprefix(&ip6->ip6_dst)) {
398: /* send icmp6 host unreach? */
399: m_freem(m);
400: return IPPROTO_DONE;
1.53 itojun 401: }
402: #endif
403:
404: udp6stat.udp6s_ipackets++;
405:
406: /* check for jumbogram is done in ip6_input. we can trust pkthdr.len */
407: plen = m->m_pkthdr.len - off;
408: #ifndef PULLDOWN_TEST
409: uh = (struct udphdr *)((caddr_t)ip6 + off);
410: #else
411: IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(struct udphdr));
412: if (uh == NULL) {
413: ip6stat.ip6s_tooshort++;
414: return IPPROTO_DONE;
415: }
416: #endif
417: ulen = ntohs((u_short)uh->uh_ulen);
1.69 itojun 418: /*
419: * RFC2675 section 4: jumbograms will have 0 in the UDP header field,
420: * iff payload length > 0xffff.
421: */
1.53 itojun 422: if (ulen == 0 && plen > 0xffff)
423: ulen = plen;
424:
425: if (plen != ulen) {
426: udp6stat.udp6s_badlen++;
1.54 itojun 427: goto bad;
428: }
429:
1.57 itojun 430: /* destination port of 0 is illegal, based on RFC768. */
431: if (uh->uh_dport == 0)
432: goto bad;
433:
1.54 itojun 434: /* Be proactive about malicious use of IPv4 mapped address */
435: if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
436: IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
437: /* XXX stat */
1.53 itojun 438: goto bad;
439: }
440:
441: /*
442: * Checksum extended UDP header and data.
443: */
444: if (uh->uh_sum == 0)
445: udp6stat.udp6s_nosum++;
446: else if (in6_cksum(m, IPPROTO_UDP, off, ulen) != 0) {
447: udp6stat.udp6s_badsum++;
448: goto bad;
449: }
450:
451: /*
452: * Construct source and dst sockaddrs.
453: * Note that ifindex (s6_addr16[1]) is already filled.
454: */
455: bzero(&src, sizeof(src));
456: src.sin6_family = AF_INET6;
457: src.sin6_len = sizeof(struct sockaddr_in6);
1.69 itojun 458: /* KAME hack: recover scopeid */
459: (void)in6_recoverscope(&src, &ip6->ip6_src, m->m_pkthdr.rcvif);
1.53 itojun 460: src.sin6_port = uh->uh_sport;
461: bzero(&dst, sizeof(dst));
462: dst.sin6_family = AF_INET6;
463: dst.sin6_len = sizeof(struct sockaddr_in6);
1.69 itojun 464: /* KAME hack: recover scopeid */
465: (void)in6_recoverscope(&dst, &ip6->ip6_dst, m->m_pkthdr.rcvif);
1.53 itojun 466: dst.sin6_port = uh->uh_dport;
467:
468: if (udp6_realinput(AF_INET6, &src, &dst, m, off) == 0) {
469: if (m->m_flags & M_MCAST) {
470: udp6stat.udp6s_noportmcast++;
471: goto bad;
472: }
1.61 itojun 473: udp6stat.udp6s_noport++;
1.53 itojun 474: icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
475: m = NULL;
476: }
477:
478: bad:
479: if (m)
480: m_freem(m);
481: return IPPROTO_DONE;
482: }
483: #endif
484:
1.72 itojun 485: #ifdef INET
1.53 itojun 486: static void
487: udp4_sendup(m, off, src, so)
488: struct mbuf *m;
489: int off; /* offset of data portion */
490: struct sockaddr *src;
491: struct socket *so;
492: {
493: struct mbuf *opts = NULL;
494: struct mbuf *n;
495: struct inpcb *inp = NULL;
496: #ifdef INET6
497: struct in6pcb *in6p = NULL;
498: #endif
499:
500: if (!so)
501: return;
502: switch (so->so_proto->pr_domain->dom_family) {
503: case AF_INET:
504: inp = sotoinpcb(so);
505: break;
506: #ifdef INET6
507: case AF_INET6:
508: in6p = sotoin6pcb(so);
509: break;
510: #endif
511: default:
512: return;
513: }
514:
515: #ifdef IPSEC
516: /* check AH/ESP integrity. */
517: if (so != NULL && ipsec4_in_reject_so(m, so)) {
518: ipsecstat.in_polvio++;
519: return;
520: }
521: #endif /*IPSEC*/
522:
523: if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
524: if (inp && (inp->inp_flags & INP_CONTROLOPTS
525: || so->so_options & SO_TIMESTAMP)) {
526: struct ip *ip = mtod(n, struct ip *);
527: ip_savecontrol(inp, &opts, ip, n);
528: }
529:
530: m_adj(n, off);
531: if (sbappendaddr(&so->so_rcv, src, n,
532: opts) == 0) {
533: m_freem(n);
534: if (opts)
535: m_freem(opts);
1.81 enami 536: udpstat.udps_fullsock++;
1.53 itojun 537: } else
538: sorwakeup(so);
539: }
540: }
1.72 itojun 541: #endif
1.53 itojun 542:
543: #ifdef INET6
544: static void
545: udp6_sendup(m, off, src, so)
546: struct mbuf *m;
547: int off; /* offset of data portion */
548: struct sockaddr *src;
549: struct socket *so;
550: {
551: struct mbuf *opts = NULL;
552: struct mbuf *n;
553: struct in6pcb *in6p = NULL;
554:
555: if (!so)
556: return;
557: if (so->so_proto->pr_domain->dom_family != AF_INET6)
558: return;
559: in6p = sotoin6pcb(so);
560:
561: #ifdef IPSEC
562: /* check AH/ESP integrity. */
563: if (so != NULL && ipsec6_in_reject_so(m, so)) {
564: ipsec6stat.in_polvio++;
565: return;
566: }
567: #endif /*IPSEC*/
568:
569: if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
570: if (in6p && (in6p->in6p_flags & IN6P_CONTROLOPTS
571: || in6p->in6p_socket->so_options & SO_TIMESTAMP)) {
572: struct ip6_hdr *ip6 = mtod(n, struct ip6_hdr *);
573: ip6_savecontrol(in6p, &opts, ip6, n);
574: }
575:
576: m_adj(n, off);
577: if (sbappendaddr(&so->so_rcv, src, n, opts) == 0) {
578: m_freem(n);
579: if (opts)
580: m_freem(opts);
581: udp6stat.udp6s_fullsock++;
582: } else
583: sorwakeup(so);
584: }
585: }
586: #endif
587:
1.72 itojun 588: #ifdef INET
1.53 itojun 589: static int
590: udp4_realinput(src, dst, m, off)
591: struct sockaddr_in *src;
592: struct sockaddr_in *dst;
593: struct mbuf *m;
594: int off; /* offset of udphdr */
595: {
596: u_int16_t *sport, *dport;
597: int rcvcnt;
598: struct in_addr *src4, *dst4;
599: struct inpcb *inp;
600:
601: rcvcnt = 0;
602: off += sizeof(struct udphdr); /* now, offset of payload */
603:
604: if (src->sin_family != AF_INET || dst->sin_family != AF_INET)
605: goto bad;
606:
607: src4 = &src->sin_addr;
608: sport = &src->sin_port;
609: dst4 = &dst->sin_addr;
610: dport = &dst->sin_port;
611:
1.73 itojun 612: if (IN_MULTICAST(dst4->s_addr) ||
1.53 itojun 613: in_broadcast(*dst4, m->m_pkthdr.rcvif)) {
614: struct inpcb *last;
615: /*
616: * Deliver a multicast or broadcast datagram to *all* sockets
617: * for which the local and remote addresses and ports match
618: * those of the incoming datagram. This allows more than
619: * one process to receive multi/broadcasts on the same port.
620: * (This really ought to be done for unicast datagrams as
621: * well, but that would cause problems with existing
622: * applications that open both address-specific sockets and
623: * a wildcard socket listening to the same port -- they would
624: * end up receiving duplicates of every unicast datagram.
625: * Those applications open the multiple sockets to overcome an
626: * inadequacy of the UDP socket interface, but for backwards
627: * compatibility we avoid the problem here rather than
628: * fixing the interface. Maybe 4.5BSD will remedy this?)
629: */
630:
631: /*
632: * KAME note: usually we drop udpiphdr from mbuf here.
1.71 itojun 633: * we need udpiphdr for IPsec processing so we do that later.
1.53 itojun 634: */
635: /*
636: * Locate pcb(s) for datagram.
637: */
638: for (inp = udbtable.inpt_queue.cqh_first;
639: inp != (struct inpcb *)&udbtable.inpt_queue;
640: inp = inp->inp_queue.cqe_next) {
641: if (inp->inp_lport != *dport)
642: continue;
643: if (!in_nullhost(inp->inp_laddr)) {
644: if (!in_hosteq(inp->inp_laddr, *dst4))
645: continue;
646: }
647: if (!in_nullhost(inp->inp_faddr)) {
648: if (!in_hosteq(inp->inp_faddr, *src4) ||
649: inp->inp_fport != *sport)
650: continue;
651: }
652:
653: last = inp;
654: udp4_sendup(m, off, (struct sockaddr *)src,
655: inp->inp_socket);
656: rcvcnt++;
657:
658: /*
659: * Don't look for additional matches if this one does
660: * not have either the SO_REUSEPORT or SO_REUSEADDR
661: * socket options set. This heuristic avoids searching
662: * through all pcbs in the common case of a non-shared
663: * port. It assumes that an application will never
664: * clear these options after setting them.
665: */
666: if ((inp->inp_socket->so_options &
667: (SO_REUSEPORT|SO_REUSEADDR)) == 0)
668: break;
669: }
670: } else {
671: /*
672: * Locate pcb for datagram.
673: */
674: inp = in_pcblookup_connect(&udbtable, *src4, *sport, *dst4, *dport);
675: if (inp == 0) {
676: ++udpstat.udps_pcbhashmiss;
677: inp = in_pcblookup_bind(&udbtable, *dst4, *dport);
1.82 itojun 678: if (inp == 0)
1.53 itojun 679: return rcvcnt;
680: }
681:
682: udp4_sendup(m, off, (struct sockaddr *)src, inp->inp_socket);
683: rcvcnt++;
684: }
685:
686: bad:
687: return rcvcnt;
688: }
1.72 itojun 689: #endif
1.53 itojun 690:
691: #ifdef INET6
692: static int
693: in6_mcmatch(in6p, ia6, ifp)
694: struct in6pcb *in6p;
1.66 augustss 695: struct in6_addr *ia6;
1.53 itojun 696: struct ifnet *ifp;
697: {
698: struct ip6_moptions *im6o = in6p->in6p_moptions;
699: struct in6_multi_mship *imm;
700:
701: if (im6o == NULL)
702: return 0;
703:
704: for (imm = im6o->im6o_memberships.lh_first; imm != NULL;
705: imm = imm->i6mm_chain.le_next) {
706: if ((ifp == NULL ||
707: imm->i6mm_maddr->in6m_ifp == ifp) &&
708: IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr,
709: ia6))
710: return 1;
711: }
712: return 0;
713: }
714:
715: static int
716: udp6_realinput(af, src, dst, m, off)
717: int af; /* af on packet */
718: struct sockaddr_in6 *src;
719: struct sockaddr_in6 *dst;
720: struct mbuf *m;
721: int off; /* offset of udphdr */
722: {
1.79 itojun 723: u_int16_t sport, dport;
1.53 itojun 724: int rcvcnt;
1.79 itojun 725: struct in6_addr src6, dst6;
726: const struct in_addr *dst4;
1.53 itojun 727: struct in6pcb *in6p;
728:
729: rcvcnt = 0;
730: off += sizeof(struct udphdr); /* now, offset of payload */
731:
732: if (af != AF_INET && af != AF_INET6)
733: goto bad;
734: if (src->sin6_family != AF_INET6 || dst->sin6_family != AF_INET6)
735: goto bad;
736:
1.79 itojun 737: in6_embedscope(&src6, src, NULL, NULL);
738: sport = src->sin6_port;
739: in6_embedscope(&dst6, dst, NULL, NULL);
740: dport = dst->sin6_port;
1.88 ! itojun 741: dst4 = (struct in_addr *)&dst->sin6_addr.s6_addr[12];
1.53 itojun 742:
1.79 itojun 743: if (IN6_IS_ADDR_MULTICAST(&dst6) ||
744: (af == AF_INET && IN_MULTICAST(dst4->s_addr))) {
1.53 itojun 745: struct in6pcb *last;
746: /*
747: * Deliver a multicast or broadcast datagram to *all* sockets
748: * for which the local and remote addresses and ports match
749: * those of the incoming datagram. This allows more than
750: * one process to receive multi/broadcasts on the same port.
751: * (This really ought to be done for unicast datagrams as
752: * well, but that would cause problems with existing
753: * applications that open both address-specific sockets and
754: * a wildcard socket listening to the same port -- they would
755: * end up receiving duplicates of every unicast datagram.
756: * Those applications open the multiple sockets to overcome an
757: * inadequacy of the UDP socket interface, but for backwards
758: * compatibility we avoid the problem here rather than
759: * fixing the interface. Maybe 4.5BSD will remedy this?)
760: */
761:
762: /*
763: * KAME note: usually we drop udpiphdr from mbuf here.
1.71 itojun 764: * we need udpiphdr for IPsec processing so we do that later.
1.53 itojun 765: */
766: /*
767: * Locate pcb(s) for datagram.
768: */
769: for (in6p = udb6.in6p_next; in6p != &udb6;
770: in6p = in6p->in6p_next) {
1.79 itojun 771: if (in6p->in6p_lport != dport)
1.53 itojun 772: continue;
773: if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
1.79 itojun 774: if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &dst6) &&
775: !in6_mcmatch(in6p, &dst6, m->m_pkthdr.rcvif))
1.53 itojun 776: continue;
777: }
1.55 itojun 778: else {
1.79 itojun 779: if (IN6_IS_ADDR_V4MAPPED(&dst6) &&
1.85 itojun 780: (in6p->in6p_flags & IN6P_IPV6_V6ONLY))
1.55 itojun 781: continue;
782: }
1.53 itojun 783: if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
1.79 itojun 784: if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr,
785: &src6) || in6p->in6p_fport != sport)
1.53 itojun 786: continue;
787: }
1.55 itojun 788: else {
1.79 itojun 789: if (IN6_IS_ADDR_V4MAPPED(&src6) &&
1.85 itojun 790: (in6p->in6p_flags & IN6P_IPV6_V6ONLY))
1.55 itojun 791: continue;
792: }
1.53 itojun 793:
794: last = in6p;
795: udp6_sendup(m, off, (struct sockaddr *)src,
796: in6p->in6p_socket);
797: rcvcnt++;
798:
799: /*
800: * Don't look for additional matches if this one does
801: * not have either the SO_REUSEPORT or SO_REUSEADDR
802: * socket options set. This heuristic avoids searching
803: * through all pcbs in the common case of a non-shared
804: * port. It assumes that an application will never
805: * clear these options after setting them.
806: */
807: if ((in6p->in6p_socket->so_options &
808: (SO_REUSEPORT|SO_REUSEADDR)) == 0)
809: break;
810: }
811: } else {
812: /*
813: * Locate pcb for datagram.
814: */
1.79 itojun 815: in6p = in6_pcblookup_connect(&udb6, &src6, sport,
816: &dst6, dport, 0);
1.53 itojun 817: if (in6p == 0) {
818: ++udpstat.udps_pcbhashmiss;
1.79 itojun 819: in6p = in6_pcblookup_bind(&udb6, &dst6, dport, 0);
1.82 itojun 820: if (in6p == 0)
1.53 itojun 821: return rcvcnt;
822: }
823:
824: udp6_sendup(m, off, (struct sockaddr *)src, in6p->in6p_socket);
825: rcvcnt++;
826: }
827:
828: bad:
829: return rcvcnt;
830: }
831: #endif
1.1 cgd 832:
1.72 itojun 833: #ifdef INET
1.1 cgd 834: /*
835: * Notify a udp user of an asynchronous error;
836: * just wake up so that he can collect error status.
837: */
1.7 mycroft 838: static void
1.1 cgd 839: udp_notify(inp, errno)
1.66 augustss 840: struct inpcb *inp;
1.7 mycroft 841: int errno;
1.1 cgd 842: {
1.34 mycroft 843:
1.1 cgd 844: inp->inp_socket->so_error = errno;
845: sorwakeup(inp->inp_socket);
846: sowwakeup(inp->inp_socket);
847: }
848:
1.27 christos 849: void *
850: udp_ctlinput(cmd, sa, v)
1.1 cgd 851: int cmd;
852: struct sockaddr *sa;
1.27 christos 853: void *v;
1.1 cgd 854: {
1.66 augustss 855: struct ip *ip = v;
856: struct udphdr *uh;
1.18 mycroft 857: void (*notify) __P((struct inpcb *, int)) = udp_notify;
1.21 mycroft 858: int errno;
1.1 cgd 859:
1.53 itojun 860: if (sa->sa_family != AF_INET
861: || sa->sa_len != sizeof(struct sockaddr_in))
1.51 itojun 862: return NULL;
1.20 mycroft 863: if ((unsigned)cmd >= PRC_NCMDS)
1.27 christos 864: return NULL;
1.20 mycroft 865: errno = inetctlerrmap[cmd];
1.18 mycroft 866: if (PRC_IS_REDIRECT(cmd))
1.19 mycroft 867: notify = in_rtchange, ip = 0;
1.18 mycroft 868: else if (cmd == PRC_HOSTDEAD)
1.19 mycroft 869: ip = 0;
1.23 cgd 870: else if (errno == 0)
1.27 christos 871: return NULL;
1.19 mycroft 872: if (ip) {
1.1 cgd 873: uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
1.34 mycroft 874: in_pcbnotify(&udbtable, satosin(sa)->sin_addr, uh->uh_dport,
875: ip->ip_src, uh->uh_sport, errno, notify);
1.53 itojun 876:
877: /* XXX mapped address case */
1.19 mycroft 878: } else
1.34 mycroft 879: in_pcbnotifyall(&udbtable, satosin(sa)->sin_addr, errno,
880: notify);
1.27 christos 881: return NULL;
1.1 cgd 882: }
883:
1.7 mycroft 884: int
1.27 christos 885: #if __STDC__
886: udp_output(struct mbuf *m, ...)
887: #else
888: udp_output(m, va_alist)
889: struct mbuf *m;
890: va_dcl
891: #endif
892: {
1.66 augustss 893: struct inpcb *inp;
894: struct udpiphdr *ui;
895: int len = m->m_pkthdr.len;
1.31 mycroft 896: int error = 0;
1.27 christos 897: va_list ap;
898:
899: va_start(ap, m);
900: inp = va_arg(ap, struct inpcb *);
901: va_end(ap);
1.1 cgd 902:
903: /*
904: * Calculate data length and get a mbuf
905: * for UDP and IP headers.
906: */
1.13 mycroft 907: M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT);
908: if (m == 0) {
909: error = ENOBUFS;
1.39 thorpej 910: goto release;
911: }
912:
913: /*
914: * Compute the packet length of the IP header, and
915: * punt if the length looks bogus.
916: */
917: if ((len + sizeof(struct udpiphdr)) > IP_MAXPACKET) {
918: error = EMSGSIZE;
1.13 mycroft 919: goto release;
920: }
1.1 cgd 921:
922: /*
923: * Fill in mbuf with extended UDP header
924: * and addresses and length put into network format.
925: */
926: ui = mtod(m, struct udpiphdr *);
927: ui->ui_pr = IPPROTO_UDP;
928: ui->ui_src = inp->inp_laddr;
929: ui->ui_dst = inp->inp_faddr;
930: ui->ui_sport = inp->inp_lport;
931: ui->ui_dport = inp->inp_fport;
1.78 thorpej 932: ui->ui_ulen = htons((u_int16_t)len + sizeof(struct udphdr));
1.1 cgd 933:
934: /*
1.78 thorpej 935: * Set up checksum and output datagram.
1.1 cgd 936: */
937: if (udpcksum) {
1.78 thorpej 938: /*
939: * XXX Cache pseudo-header checksum part for
940: * XXX "connected" UDP sockets.
941: */
942: ui->ui_sum = in_cksum_phdr(ui->ui_src.s_addr,
943: ui->ui_dst.s_addr, htons((u_int16_t)len +
944: sizeof(struct udphdr) + IPPROTO_UDP));
945: m->m_pkthdr.csum_flags = M_CSUM_UDPv4;
946: m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
947: } else
948: ui->ui_sum = 0;
1.1 cgd 949: ((struct ip *)ui)->ip_len = sizeof (struct udpiphdr) + len;
950: ((struct ip *)ui)->ip_ttl = inp->inp_ip.ip_ttl; /* XXX */
951: ((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; /* XXX */
952: udpstat.udps_opackets++;
1.48 itojun 953:
954: #ifdef IPSEC
1.75 itojun 955: if (ipsec_setsocket(m, inp->inp_socket) != 0) {
956: error = ENOBUFS;
957: goto release;
958: }
1.48 itojun 959: #endif /*IPSEC*/
960:
1.31 mycroft 961: return (ip_output(m, inp->inp_options, &inp->inp_route,
1.12 mycroft 962: inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST),
1.31 mycroft 963: inp->inp_moptions));
1.1 cgd 964:
965: release:
966: m_freem(m);
967: return (error);
968: }
969:
1.42 thorpej 970: int udp_sendspace = 9216; /* really max datagram size */
971: int udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in));
1.1 cgd 972: /* 40 1K datagrams */
973:
974: /*ARGSUSED*/
1.7 mycroft 975: int
1.31 mycroft 976: udp_usrreq(so, req, m, nam, control, p)
1.1 cgd 977: struct socket *so;
978: int req;
1.31 mycroft 979: struct mbuf *m, *nam, *control;
1.30 mycroft 980: struct proc *p;
1.1 cgd 981: {
1.66 augustss 982: struct inpcb *inp;
1.1 cgd 983: int s;
1.66 augustss 984: int error = 0;
1.1 cgd 985:
986: if (req == PRU_CONTROL)
1.31 mycroft 987: return (in_control(so, (long)m, (caddr_t)nam,
1.30 mycroft 988: (struct ifnet *)control, p));
1.59 thorpej 989:
1.60 thorpej 990: if (req == PRU_PURGEIF) {
1.80 itojun 991: in_pcbpurgeif0(&udbtable, (struct ifnet *)control);
1.60 thorpej 992: in_purgeif((struct ifnet *)control);
993: in_pcbpurgeif(&udbtable, (struct ifnet *)control);
1.59 thorpej 994: return (0);
995: }
1.31 mycroft 996:
997: s = splsoftnet();
998: inp = sotoinpcb(so);
1.32 mycroft 999: #ifdef DIAGNOSTIC
1000: if (req != PRU_SEND && req != PRU_SENDOOB && control)
1001: panic("udp_usrreq: unexpected control mbuf");
1002: #endif
1.31 mycroft 1003: if (inp == 0 && req != PRU_ATTACH) {
1004: error = EINVAL;
1005: goto release;
1006: }
1007:
1.1 cgd 1008: /*
1009: * Note: need to block udp_input while changing
1010: * the udp pcb queue and/or pcb addresses.
1011: */
1012: switch (req) {
1013:
1014: case PRU_ATTACH:
1.31 mycroft 1015: if (inp != 0) {
1016: error = EISCONN;
1.1 cgd 1017: break;
1018: }
1.31 mycroft 1019: if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
1020: error = soreserve(so, udp_sendspace, udp_recvspace);
1021: if (error)
1022: break;
1023: }
1.18 mycroft 1024: error = in_pcballoc(so, &udbtable);
1.1 cgd 1025: if (error)
1026: break;
1.31 mycroft 1027: inp = sotoinpcb(so);
1028: inp->inp_ip.ip_ttl = ip_defttl;
1.1 cgd 1029: break;
1030:
1031: case PRU_DETACH:
1.31 mycroft 1032: in_pcbdetach(inp);
1.1 cgd 1033: break;
1034:
1035: case PRU_BIND:
1.31 mycroft 1036: error = in_pcbbind(inp, nam, p);
1.1 cgd 1037: break;
1038:
1039: case PRU_LISTEN:
1040: error = EOPNOTSUPP;
1041: break;
1042:
1043: case PRU_CONNECT:
1.31 mycroft 1044: error = in_pcbconnect(inp, nam);
1045: if (error)
1.1 cgd 1046: break;
1.31 mycroft 1047: soisconnected(so);
1.1 cgd 1048: break;
1049:
1050: case PRU_CONNECT2:
1051: error = EOPNOTSUPP;
1052: break;
1053:
1054: case PRU_DISCONNECT:
1.31 mycroft 1055: /*soisdisconnected(so);*/
1056: so->so_state &= ~SS_ISCONNECTED; /* XXX */
1.1 cgd 1057: in_pcbdisconnect(inp);
1.34 mycroft 1058: inp->inp_laddr = zeroin_addr; /* XXX */
1.35 mycroft 1059: in_pcbstate(inp, INP_BOUND); /* XXX */
1.1 cgd 1060: break;
1061:
1062: case PRU_SHUTDOWN:
1063: socantsendmore(so);
1064: break;
1065:
1.31 mycroft 1066: case PRU_RCVD:
1067: error = EOPNOTSUPP;
1.1 cgd 1068: break;
1069:
1.31 mycroft 1070: case PRU_SEND:
1.32 mycroft 1071: if (control && control->m_len) {
1072: m_freem(control);
1073: m_freem(m);
1074: error = EINVAL;
1075: break;
1076: }
1.31 mycroft 1077: {
1.35 mycroft 1078: struct in_addr laddr; /* XXX */
1.1 cgd 1079:
1.31 mycroft 1080: if (nam) {
1.35 mycroft 1081: laddr = inp->inp_laddr; /* XXX */
1.31 mycroft 1082: if ((so->so_state & SS_ISCONNECTED) != 0) {
1083: error = EISCONN;
1.32 mycroft 1084: goto die;
1.31 mycroft 1085: }
1086: error = in_pcbconnect(inp, nam);
1.32 mycroft 1087: if (error) {
1088: die:
1089: m_freem(m);
1.31 mycroft 1090: break;
1.32 mycroft 1091: }
1.31 mycroft 1092: } else {
1093: if ((so->so_state & SS_ISCONNECTED) == 0) {
1094: error = ENOTCONN;
1.32 mycroft 1095: goto die;
1.31 mycroft 1096: }
1097: }
1.33 mycroft 1098: error = udp_output(m, inp);
1.31 mycroft 1099: if (nam) {
1100: in_pcbdisconnect(inp);
1.35 mycroft 1101: inp->inp_laddr = laddr; /* XXX */
1102: in_pcbstate(inp, INP_BOUND); /* XXX */
1.31 mycroft 1103: }
1104: }
1.1 cgd 1105: break;
1106:
1107: case PRU_SENSE:
1108: /*
1109: * stat: don't bother with a blocksize.
1110: */
1.31 mycroft 1111: splx(s);
1.1 cgd 1112: return (0);
1113:
1.31 mycroft 1114: case PRU_RCVOOB:
1115: error = EOPNOTSUPP;
1116: break;
1117:
1.1 cgd 1118: case PRU_SENDOOB:
1.32 mycroft 1119: m_freem(control);
1.31 mycroft 1120: m_freem(m);
1.1 cgd 1121: error = EOPNOTSUPP;
1122: break;
1123:
1.31 mycroft 1124: case PRU_SOCKADDR:
1125: in_setsockaddr(inp, nam);
1126: break;
1127:
1128: case PRU_PEERADDR:
1129: in_setpeeraddr(inp, nam);
1130: break;
1.1 cgd 1131:
1132: default:
1133: panic("udp_usrreq");
1134: }
1135:
1136: release:
1.31 mycroft 1137: splx(s);
1.1 cgd 1138: return (error);
1.13 mycroft 1139: }
1140:
1141: /*
1142: * Sysctl for udp variables.
1143: */
1.27 christos 1144: int
1.13 mycroft 1145: udp_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
1146: int *name;
1147: u_int namelen;
1148: void *oldp;
1149: size_t *oldlenp;
1150: void *newp;
1151: size_t newlen;
1152: {
1153: /* All sysctl names at this level are terminal. */
1154: if (namelen != 1)
1155: return (ENOTDIR);
1156:
1157: switch (name[0]) {
1158: case UDPCTL_CHECKSUM:
1159: return (sysctl_int(oldp, oldlenp, newp, newlen, &udpcksum));
1.42 thorpej 1160: case UDPCTL_SENDSPACE:
1161: return (sysctl_int(oldp, oldlenp, newp, newlen,
1162: &udp_sendspace));
1163: case UDPCTL_RECVSPACE:
1164: return (sysctl_int(oldp, oldlenp, newp, newlen,
1165: &udp_recvspace));
1.13 mycroft 1166: default:
1167: return (ENOPROTOOPT);
1168: }
1169: /* NOTREACHED */
1.1 cgd 1170: }
1.72 itojun 1171: #endif
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