Annotation of src/sys/netinet/udp_usrreq.c, Revision 1.93.2.3
1.93.2.3! gehenna 1: /* $NetBSD: udp_usrreq.c,v 1.96 2002/08/14 00:23:36 itojun Exp $ */
1.48 itojun 2:
3: /*
4: * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
5: * All rights reserved.
1.93.2.1 gehenna 6: *
1.48 itojun 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.
1.93.2.1 gehenna 18: *
1.48 itojun 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: */
1.91 lukem 66:
67: #include <sys/cdefs.h>
1.93.2.3! gehenna 68: __KERNEL_RCSID(0, "$NetBSD: udp_usrreq.c,v 1.96 2002/08/14 00:23:36 itojun Exp $");
1.50 thorpej 69:
1.77 soda 70: #include "opt_inet.h"
1.50 thorpej 71: #include "opt_ipsec.h"
1.78 thorpej 72: #include "opt_inet_csum.h"
1.64 ws 73: #include "opt_ipkdb.h"
1.1 cgd 74:
1.5 mycroft 75: #include <sys/param.h>
76: #include <sys/malloc.h>
77: #include <sys/mbuf.h>
78: #include <sys/protosw.h>
79: #include <sys/socket.h>
80: #include <sys/socketvar.h>
1.13 mycroft 81: #include <sys/errno.h>
1.5 mycroft 82: #include <sys/stat.h>
1.27 christos 83: #include <sys/systm.h>
84: #include <sys/proc.h>
1.53 itojun 85: #include <sys/domain.h>
1.27 christos 86: #include <sys/sysctl.h>
1.1 cgd 87:
1.5 mycroft 88: #include <net/if.h>
89: #include <net/route.h>
1.1 cgd 90:
1.5 mycroft 91: #include <netinet/in.h>
92: #include <netinet/in_systm.h>
1.15 cgd 93: #include <netinet/in_var.h>
1.5 mycroft 94: #include <netinet/ip.h>
95: #include <netinet/in_pcb.h>
96: #include <netinet/ip_var.h>
97: #include <netinet/ip_icmp.h>
98: #include <netinet/udp.h>
99: #include <netinet/udp_var.h>
1.1 cgd 100:
1.53 itojun 101: #ifdef INET6
102: #include <netinet/ip6.h>
103: #include <netinet/icmp6.h>
104: #include <netinet6/ip6_var.h>
105: #include <netinet6/in6_pcb.h>
106: #include <netinet6/udp6_var.h>
107: #endif
108:
109: #ifdef PULLDOWN_TEST
110: #ifndef INET6
111: /* always need ip6.h for IP6_EXTHDR_GET */
112: #include <netinet/ip6.h>
113: #endif
114: #endif
115:
1.76 itojun 116: #include "faith.h"
117: #if defined(NFAITH) && NFAITH > 0
118: #include <net/if_faith.h>
119: #endif
120:
1.27 christos 121: #include <machine/stdarg.h>
122:
1.48 itojun 123: #ifdef IPSEC
124: #include <netinet6/ipsec.h>
125: #include <netkey/key.h>
126: #endif /*IPSEC*/
127:
1.64 ws 128: #ifdef IPKDB
129: #include <ipkdb/ipkdb.h>
130: #endif
131:
1.8 mycroft 132: /*
133: * UDP protocol implementation.
134: * Per RFC 768, August, 1980.
135: */
136: #ifndef COMPAT_42
137: int udpcksum = 1;
138: #else
139: int udpcksum = 0; /* XXX */
140: #endif
1.93 matt 141:
142: struct inpcbtable udbtable;
143: struct udpstat udpstat;
1.8 mycroft 144:
1.72 itojun 145: #ifdef INET
1.53 itojun 146: static void udp4_sendup __P((struct mbuf *, int, struct sockaddr *,
147: struct socket *));
148: static int udp4_realinput __P((struct sockaddr_in *, struct sockaddr_in *,
149: struct mbuf *, int));
1.72 itojun 150: #endif
1.53 itojun 151: #ifdef INET6
152: static void udp6_sendup __P((struct mbuf *, int, struct sockaddr *,
153: struct socket *));
154: static int udp6_realinput __P((int, struct sockaddr_in6 *,
155: struct sockaddr_in6 *, struct mbuf *, int));
156: #endif
1.72 itojun 157: #ifdef INET
1.13 mycroft 158: static void udp_notify __P((struct inpcb *, int));
1.72 itojun 159: #endif
1.7 mycroft 160:
1.26 mycroft 161: #ifndef UDBHASHSIZE
162: #define UDBHASHSIZE 128
163: #endif
164: int udbhashsize = UDBHASHSIZE;
165:
1.78 thorpej 166: #ifdef UDP_CSUM_COUNTERS
167: #include <sys/device.h>
168:
169: struct evcnt udp_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
170: NULL, "udp", "hwcsum bad");
171: struct evcnt udp_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
172: NULL, "udp", "hwcsum ok");
173: struct evcnt udp_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
174: NULL, "udp", "hwcsum data");
175: struct evcnt udp_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
176: NULL, "udp", "swcsum");
177:
178: #define UDP_CSUM_COUNTER_INCR(ev) (ev)->ev_count++
179:
180: #else
181:
182: #define UDP_CSUM_COUNTER_INCR(ev) /* nothing */
183:
184: #endif /* UDP_CSUM_COUNTERS */
185:
1.7 mycroft 186: void
1.1 cgd 187: udp_init()
188: {
1.18 mycroft 189:
1.72 itojun 190: #ifdef INET
1.35 mycroft 191: in_pcbinit(&udbtable, udbhashsize, udbhashsize);
1.72 itojun 192: #endif
1.78 thorpej 193:
194: #ifdef UDP_CSUM_COUNTERS
195: evcnt_attach_static(&udp_hwcsum_bad);
196: evcnt_attach_static(&udp_hwcsum_ok);
197: evcnt_attach_static(&udp_hwcsum_data);
198: evcnt_attach_static(&udp_swcsum);
199: #endif /* UDP_CSUM_COUNTERS */
1.1 cgd 200: }
201:
1.72 itojun 202: #ifdef INET
1.7 mycroft 203: void
1.27 christos 204: #if __STDC__
205: udp_input(struct mbuf *m, ...)
206: #else
207: udp_input(m, va_alist)
208: struct mbuf *m;
209: va_dcl
210: #endif
1.1 cgd 211: {
1.53 itojun 212: va_list ap;
213: struct sockaddr_in src, dst;
214: struct ip *ip;
215: struct udphdr *uh;
216: int iphlen, proto;
217: int len;
218: int n;
1.93.2.3! gehenna 219: u_int16_t ip_len;
1.53 itojun 220:
221: va_start(ap, m);
222: iphlen = va_arg(ap, int);
223: proto = va_arg(ap, int);
224: va_end(ap);
225:
226: udpstat.udps_ipackets++;
227:
228: #ifndef PULLDOWN_TEST
229: /*
230: * Strip IP options, if any; should skip this,
231: * make available to user, and use on returned packets,
232: * but we don't yet have a way to check the checksum
233: * with options still present.
234: */
235: if (iphlen > sizeof (struct ip)) {
236: ip_stripoptions(m, (struct mbuf *)0);
237: iphlen = sizeof(struct ip);
238: }
239: #else
240: /*
241: * we may enable the above code if we save and pass IPv4 options
242: * to the userland.
243: */
244: #endif
245:
246: /*
247: * Get IP and UDP header together in first mbuf.
248: */
249: ip = mtod(m, struct ip *);
250: #ifndef PULLDOWN_TEST
251: if (m->m_len < iphlen + sizeof(struct udphdr)) {
252: if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == 0) {
253: udpstat.udps_hdrops++;
254: return;
255: }
256: ip = mtod(m, struct ip *);
257: }
258: uh = (struct udphdr *)((caddr_t)ip + iphlen);
259: #else
260: IP6_EXTHDR_GET(uh, struct udphdr *, m, iphlen, sizeof(struct udphdr));
261: if (uh == NULL) {
262: udpstat.udps_hdrops++;
263: return;
264: }
265: #endif
1.93.2.2 gehenna 266: KASSERT(UDP_HDR_ALIGNED_P(uh));
1.53 itojun 267:
1.57 itojun 268: /* destination port of 0 is illegal, based on RFC768. */
269: if (uh->uh_dport == 0)
270: goto bad;
271:
1.53 itojun 272: /*
273: * Make mbuf data length reflect UDP length.
274: * If not enough data to reflect UDP length, drop.
275: */
1.93.2.3! gehenna 276: ip_len = ntohs(ip->ip_len);
1.53 itojun 277: len = ntohs((u_int16_t)uh->uh_ulen);
1.93.2.3! gehenna 278: if (ip_len != iphlen + len) {
! 279: if (ip_len < iphlen + len || len < sizeof(struct udphdr)) {
1.53 itojun 280: udpstat.udps_badlen++;
281: goto bad;
282: }
1.93.2.3! gehenna 283: m_adj(m, iphlen + len - ip_len);
1.53 itojun 284: }
285:
286: /*
287: * Checksum extended UDP header and data.
288: */
289: if (uh->uh_sum) {
1.78 thorpej 290: switch (m->m_pkthdr.csum_flags &
1.84 thorpej 291: ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv4) |
1.78 thorpej 292: M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) {
293: case M_CSUM_UDPv4|M_CSUM_TCP_UDP_BAD:
294: UDP_CSUM_COUNTER_INCR(&udp_hwcsum_bad);
295: goto badcsum;
296:
297: case M_CSUM_UDPv4|M_CSUM_DATA:
298: UDP_CSUM_COUNTER_INCR(&udp_hwcsum_data);
299: if ((m->m_pkthdr.csum_data ^ 0xffff) != 0)
300: goto badcsum;
301: break;
302:
303: case M_CSUM_UDPv4:
304: /* Checksum was okay. */
305: UDP_CSUM_COUNTER_INCR(&udp_hwcsum_ok);
306: break;
307:
308: default:
309: /* Need to compute it ourselves. */
310: UDP_CSUM_COUNTER_INCR(&udp_swcsum);
311: if (in4_cksum(m, IPPROTO_UDP, iphlen, len) != 0)
312: goto badcsum;
313: break;
1.53 itojun 314: }
315: }
316:
317: /* construct source and dst sockaddrs. */
318: bzero(&src, sizeof(src));
319: src.sin_family = AF_INET;
320: src.sin_len = sizeof(struct sockaddr_in);
321: bcopy(&ip->ip_src, &src.sin_addr, sizeof(src.sin_addr));
322: src.sin_port = uh->uh_sport;
323: bzero(&dst, sizeof(dst));
324: dst.sin_family = AF_INET;
325: dst.sin_len = sizeof(struct sockaddr_in);
326: bcopy(&ip->ip_dst, &dst.sin_addr, sizeof(dst.sin_addr));
327: dst.sin_port = uh->uh_dport;
328:
329: n = udp4_realinput(&src, &dst, m, iphlen);
330: #ifdef INET6
331: if (IN_MULTICAST(ip->ip_dst.s_addr) || n == 0) {
332: struct sockaddr_in6 src6, dst6;
333:
334: bzero(&src6, sizeof(src6));
335: src6.sin6_family = AF_INET6;
336: src6.sin6_len = sizeof(struct sockaddr_in6);
337: src6.sin6_addr.s6_addr[10] = src6.sin6_addr.s6_addr[11] = 0xff;
338: bcopy(&ip->ip_src, &src6.sin6_addr.s6_addr[12],
339: sizeof(ip->ip_src));
340: src6.sin6_port = uh->uh_sport;
341: bzero(&dst6, sizeof(dst6));
342: dst6.sin6_family = AF_INET6;
343: dst6.sin6_len = sizeof(struct sockaddr_in6);
344: dst6.sin6_addr.s6_addr[10] = dst6.sin6_addr.s6_addr[11] = 0xff;
345: bcopy(&ip->ip_dst, &dst6.sin6_addr.s6_addr[12],
346: sizeof(ip->ip_dst));
347: dst6.sin6_port = uh->uh_dport;
348:
349: n += udp6_realinput(AF_INET, &src6, &dst6, m, iphlen);
350: }
351: #endif
352:
353: if (n == 0) {
354: if (m->m_flags & (M_BCAST | M_MCAST)) {
355: udpstat.udps_noportbcast++;
356: goto bad;
357: }
1.61 itojun 358: udpstat.udps_noport++;
1.64 ws 359: #ifdef IPKDB
1.53 itojun 360: if (checkipkdb(&ip->ip_src, uh->uh_sport, uh->uh_dport,
361: m, iphlen + sizeof(struct udphdr),
362: m->m_pkthdr.len - iphlen - sizeof(struct udphdr))) {
363: /*
364: * It was a debugger connect packet,
365: * just drop it now
366: */
367: goto bad;
368: }
369: #endif
370: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
371: m = NULL;
372: }
373:
374: bad:
375: if (m)
376: m_freem(m);
1.78 thorpej 377: return;
378:
379: badcsum:
380: m_freem(m);
381: udpstat.udps_badsum++;
1.53 itojun 382: }
1.72 itojun 383: #endif
1.53 itojun 384:
385: #ifdef INET6
386: int
387: udp6_input(mp, offp, proto)
388: struct mbuf **mp;
389: int *offp, proto;
390: {
391: struct mbuf *m = *mp;
392: int off = *offp;
393: struct sockaddr_in6 src, dst;
394: struct ip6_hdr *ip6;
395: struct udphdr *uh;
396: u_int32_t plen, ulen;
397:
1.76 itojun 398: #ifndef PULLDOWN_TEST
399: IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE);
400: #endif
401: ip6 = mtod(m, struct ip6_hdr *);
402:
1.53 itojun 403: #if defined(NFAITH) && 0 < NFAITH
1.76 itojun 404: if (faithprefix(&ip6->ip6_dst)) {
405: /* send icmp6 host unreach? */
406: m_freem(m);
407: return IPPROTO_DONE;
1.53 itojun 408: }
409: #endif
410:
411: udp6stat.udp6s_ipackets++;
412:
413: /* check for jumbogram is done in ip6_input. we can trust pkthdr.len */
414: plen = m->m_pkthdr.len - off;
415: #ifndef PULLDOWN_TEST
416: uh = (struct udphdr *)((caddr_t)ip6 + off);
417: #else
418: IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(struct udphdr));
419: if (uh == NULL) {
420: ip6stat.ip6s_tooshort++;
421: return IPPROTO_DONE;
422: }
423: #endif
1.93.2.2 gehenna 424: KASSERT(UDP_HDR_ALIGNED_P(uh));
1.53 itojun 425: ulen = ntohs((u_short)uh->uh_ulen);
1.69 itojun 426: /*
427: * RFC2675 section 4: jumbograms will have 0 in the UDP header field,
428: * iff payload length > 0xffff.
429: */
1.53 itojun 430: if (ulen == 0 && plen > 0xffff)
431: ulen = plen;
432:
433: if (plen != ulen) {
434: udp6stat.udp6s_badlen++;
1.54 itojun 435: goto bad;
436: }
437:
1.57 itojun 438: /* destination port of 0 is illegal, based on RFC768. */
439: if (uh->uh_dport == 0)
440: goto bad;
441:
1.54 itojun 442: /* Be proactive about malicious use of IPv4 mapped address */
443: if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
444: IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
445: /* XXX stat */
1.53 itojun 446: goto bad;
447: }
448:
449: /*
450: * Checksum extended UDP header and data.
451: */
452: if (uh->uh_sum == 0)
453: udp6stat.udp6s_nosum++;
454: else if (in6_cksum(m, IPPROTO_UDP, off, ulen) != 0) {
455: udp6stat.udp6s_badsum++;
456: goto bad;
457: }
458:
459: /*
460: * Construct source and dst sockaddrs.
461: * Note that ifindex (s6_addr16[1]) is already filled.
462: */
463: bzero(&src, sizeof(src));
464: src.sin6_family = AF_INET6;
465: src.sin6_len = sizeof(struct sockaddr_in6);
1.69 itojun 466: /* KAME hack: recover scopeid */
467: (void)in6_recoverscope(&src, &ip6->ip6_src, m->m_pkthdr.rcvif);
1.53 itojun 468: src.sin6_port = uh->uh_sport;
469: bzero(&dst, sizeof(dst));
470: dst.sin6_family = AF_INET6;
471: dst.sin6_len = sizeof(struct sockaddr_in6);
1.69 itojun 472: /* KAME hack: recover scopeid */
473: (void)in6_recoverscope(&dst, &ip6->ip6_dst, m->m_pkthdr.rcvif);
1.53 itojun 474: dst.sin6_port = uh->uh_dport;
475:
476: if (udp6_realinput(AF_INET6, &src, &dst, m, off) == 0) {
477: if (m->m_flags & M_MCAST) {
478: udp6stat.udp6s_noportmcast++;
479: goto bad;
480: }
1.61 itojun 481: udp6stat.udp6s_noport++;
1.53 itojun 482: icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
483: m = NULL;
484: }
485:
486: bad:
487: if (m)
488: m_freem(m);
489: return IPPROTO_DONE;
490: }
491: #endif
492:
1.72 itojun 493: #ifdef INET
1.53 itojun 494: static void
495: udp4_sendup(m, off, src, so)
496: struct mbuf *m;
497: int off; /* offset of data portion */
498: struct sockaddr *src;
499: struct socket *so;
500: {
501: struct mbuf *opts = NULL;
502: struct mbuf *n;
503: struct inpcb *inp = NULL;
504: #ifdef INET6
505: struct in6pcb *in6p = NULL;
506: #endif
507:
508: if (!so)
509: return;
510: switch (so->so_proto->pr_domain->dom_family) {
511: case AF_INET:
512: inp = sotoinpcb(so);
513: break;
514: #ifdef INET6
515: case AF_INET6:
516: in6p = sotoin6pcb(so);
517: break;
518: #endif
519: default:
520: return;
521: }
522:
523: #ifdef IPSEC
524: /* check AH/ESP integrity. */
525: if (so != NULL && ipsec4_in_reject_so(m, so)) {
526: ipsecstat.in_polvio++;
527: return;
528: }
529: #endif /*IPSEC*/
530:
531: if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
532: if (inp && (inp->inp_flags & INP_CONTROLOPTS
533: || so->so_options & SO_TIMESTAMP)) {
534: struct ip *ip = mtod(n, struct ip *);
535: ip_savecontrol(inp, &opts, ip, n);
536: }
537:
538: m_adj(n, off);
539: if (sbappendaddr(&so->so_rcv, src, n,
540: opts) == 0) {
541: m_freem(n);
542: if (opts)
543: m_freem(opts);
1.81 enami 544: udpstat.udps_fullsock++;
1.53 itojun 545: } else
546: sorwakeup(so);
547: }
548: }
1.72 itojun 549: #endif
1.53 itojun 550:
551: #ifdef INET6
552: static void
553: udp6_sendup(m, off, src, so)
554: struct mbuf *m;
555: int off; /* offset of data portion */
556: struct sockaddr *src;
557: struct socket *so;
558: {
559: struct mbuf *opts = NULL;
560: struct mbuf *n;
561: struct in6pcb *in6p = NULL;
562:
563: if (!so)
564: return;
565: if (so->so_proto->pr_domain->dom_family != AF_INET6)
566: return;
567: in6p = sotoin6pcb(so);
568:
569: #ifdef IPSEC
570: /* check AH/ESP integrity. */
571: if (so != NULL && ipsec6_in_reject_so(m, so)) {
572: ipsec6stat.in_polvio++;
573: return;
574: }
575: #endif /*IPSEC*/
576:
577: if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
578: if (in6p && (in6p->in6p_flags & IN6P_CONTROLOPTS
579: || in6p->in6p_socket->so_options & SO_TIMESTAMP)) {
580: struct ip6_hdr *ip6 = mtod(n, struct ip6_hdr *);
581: ip6_savecontrol(in6p, &opts, ip6, n);
582: }
583:
584: m_adj(n, off);
585: if (sbappendaddr(&so->so_rcv, src, n, opts) == 0) {
586: m_freem(n);
587: if (opts)
588: m_freem(opts);
589: udp6stat.udp6s_fullsock++;
590: } else
591: sorwakeup(so);
592: }
593: }
594: #endif
595:
1.72 itojun 596: #ifdef INET
1.53 itojun 597: static int
598: udp4_realinput(src, dst, m, off)
599: struct sockaddr_in *src;
600: struct sockaddr_in *dst;
601: struct mbuf *m;
602: int off; /* offset of udphdr */
603: {
604: u_int16_t *sport, *dport;
605: int rcvcnt;
606: struct in_addr *src4, *dst4;
607: struct inpcb *inp;
608:
609: rcvcnt = 0;
610: off += sizeof(struct udphdr); /* now, offset of payload */
611:
612: if (src->sin_family != AF_INET || dst->sin_family != AF_INET)
613: goto bad;
614:
615: src4 = &src->sin_addr;
616: sport = &src->sin_port;
617: dst4 = &dst->sin_addr;
618: dport = &dst->sin_port;
619:
1.73 itojun 620: if (IN_MULTICAST(dst4->s_addr) ||
1.53 itojun 621: in_broadcast(*dst4, m->m_pkthdr.rcvif)) {
622: struct inpcb *last;
623: /*
624: * Deliver a multicast or broadcast datagram to *all* sockets
625: * for which the local and remote addresses and ports match
626: * those of the incoming datagram. This allows more than
627: * one process to receive multi/broadcasts on the same port.
628: * (This really ought to be done for unicast datagrams as
629: * well, but that would cause problems with existing
630: * applications that open both address-specific sockets and
631: * a wildcard socket listening to the same port -- they would
632: * end up receiving duplicates of every unicast datagram.
633: * Those applications open the multiple sockets to overcome an
634: * inadequacy of the UDP socket interface, but for backwards
635: * compatibility we avoid the problem here rather than
636: * fixing the interface. Maybe 4.5BSD will remedy this?)
637: */
638:
639: /*
1.92 itojun 640: * KAME note: traditionally we dropped udpiphdr from mbuf here.
1.71 itojun 641: * we need udpiphdr for IPsec processing so we do that later.
1.53 itojun 642: */
643: /*
644: * Locate pcb(s) for datagram.
645: */
1.89 matt 646: CIRCLEQ_FOREACH(inp, &udbtable.inpt_queue, inp_queue) {
1.53 itojun 647: if (inp->inp_lport != *dport)
648: continue;
649: if (!in_nullhost(inp->inp_laddr)) {
650: if (!in_hosteq(inp->inp_laddr, *dst4))
651: continue;
652: }
653: if (!in_nullhost(inp->inp_faddr)) {
654: if (!in_hosteq(inp->inp_faddr, *src4) ||
655: inp->inp_fport != *sport)
656: continue;
657: }
658:
659: last = inp;
660: udp4_sendup(m, off, (struct sockaddr *)src,
661: inp->inp_socket);
662: rcvcnt++;
663:
664: /*
665: * Don't look for additional matches if this one does
666: * not have either the SO_REUSEPORT or SO_REUSEADDR
667: * socket options set. This heuristic avoids searching
668: * through all pcbs in the common case of a non-shared
669: * port. It assumes that an application will never
670: * clear these options after setting them.
671: */
672: if ((inp->inp_socket->so_options &
673: (SO_REUSEPORT|SO_REUSEADDR)) == 0)
674: break;
675: }
676: } else {
677: /*
678: * Locate pcb for datagram.
679: */
680: inp = in_pcblookup_connect(&udbtable, *src4, *sport, *dst4, *dport);
681: if (inp == 0) {
682: ++udpstat.udps_pcbhashmiss;
683: inp = in_pcblookup_bind(&udbtable, *dst4, *dport);
1.82 itojun 684: if (inp == 0)
1.53 itojun 685: return rcvcnt;
686: }
687:
688: udp4_sendup(m, off, (struct sockaddr *)src, inp->inp_socket);
689: rcvcnt++;
690: }
691:
692: bad:
693: return rcvcnt;
694: }
1.72 itojun 695: #endif
1.53 itojun 696:
697: #ifdef INET6
698: static int
699: udp6_realinput(af, src, dst, m, off)
700: int af; /* af on packet */
701: struct sockaddr_in6 *src;
702: struct sockaddr_in6 *dst;
703: struct mbuf *m;
704: int off; /* offset of udphdr */
705: {
1.79 itojun 706: u_int16_t sport, dport;
1.53 itojun 707: int rcvcnt;
1.79 itojun 708: struct in6_addr src6, dst6;
709: const struct in_addr *dst4;
1.53 itojun 710: struct in6pcb *in6p;
711:
712: rcvcnt = 0;
713: off += sizeof(struct udphdr); /* now, offset of payload */
714:
715: if (af != AF_INET && af != AF_INET6)
716: goto bad;
717: if (src->sin6_family != AF_INET6 || dst->sin6_family != AF_INET6)
718: goto bad;
719:
1.79 itojun 720: in6_embedscope(&src6, src, NULL, NULL);
721: sport = src->sin6_port;
722: in6_embedscope(&dst6, dst, NULL, NULL);
723: dport = dst->sin6_port;
1.88 itojun 724: dst4 = (struct in_addr *)&dst->sin6_addr.s6_addr[12];
1.53 itojun 725:
1.79 itojun 726: if (IN6_IS_ADDR_MULTICAST(&dst6) ||
727: (af == AF_INET && IN_MULTICAST(dst4->s_addr))) {
1.53 itojun 728: struct in6pcb *last;
729: /*
730: * Deliver a multicast or broadcast datagram to *all* sockets
731: * for which the local and remote addresses and ports match
732: * those of the incoming datagram. This allows more than
733: * one process to receive multi/broadcasts on the same port.
734: * (This really ought to be done for unicast datagrams as
735: * well, but that would cause problems with existing
736: * applications that open both address-specific sockets and
737: * a wildcard socket listening to the same port -- they would
738: * end up receiving duplicates of every unicast datagram.
739: * Those applications open the multiple sockets to overcome an
740: * inadequacy of the UDP socket interface, but for backwards
741: * compatibility we avoid the problem here rather than
742: * fixing the interface. Maybe 4.5BSD will remedy this?)
743: */
744:
745: /*
1.92 itojun 746: * KAME note: traditionally we dropped udpiphdr from mbuf here.
1.71 itojun 747: * we need udpiphdr for IPsec processing so we do that later.
1.53 itojun 748: */
749: /*
750: * Locate pcb(s) for datagram.
751: */
752: for (in6p = udb6.in6p_next; in6p != &udb6;
753: in6p = in6p->in6p_next) {
1.79 itojun 754: if (in6p->in6p_lport != dport)
1.53 itojun 755: continue;
756: if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
1.90 itojun 757: if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &dst6))
1.53 itojun 758: continue;
1.92 itojun 759: } else {
1.79 itojun 760: if (IN6_IS_ADDR_V4MAPPED(&dst6) &&
1.85 itojun 761: (in6p->in6p_flags & IN6P_IPV6_V6ONLY))
1.55 itojun 762: continue;
763: }
1.53 itojun 764: if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
1.79 itojun 765: if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr,
766: &src6) || in6p->in6p_fport != sport)
1.53 itojun 767: continue;
1.92 itojun 768: } else {
1.79 itojun 769: if (IN6_IS_ADDR_V4MAPPED(&src6) &&
1.85 itojun 770: (in6p->in6p_flags & IN6P_IPV6_V6ONLY))
1.55 itojun 771: continue;
772: }
1.53 itojun 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: } else {
792: /*
793: * Locate pcb for datagram.
794: */
1.79 itojun 795: in6p = in6_pcblookup_connect(&udb6, &src6, sport,
796: &dst6, dport, 0);
1.53 itojun 797: if (in6p == 0) {
798: ++udpstat.udps_pcbhashmiss;
1.79 itojun 799: in6p = in6_pcblookup_bind(&udb6, &dst6, dport, 0);
1.82 itojun 800: if (in6p == 0)
1.53 itojun 801: return rcvcnt;
802: }
803:
804: udp6_sendup(m, off, (struct sockaddr *)src, in6p->in6p_socket);
805: rcvcnt++;
806: }
807:
808: bad:
809: return rcvcnt;
810: }
811: #endif
1.1 cgd 812:
1.72 itojun 813: #ifdef INET
1.1 cgd 814: /*
815: * Notify a udp user of an asynchronous error;
816: * just wake up so that he can collect error status.
817: */
1.7 mycroft 818: static void
1.1 cgd 819: udp_notify(inp, errno)
1.66 augustss 820: struct inpcb *inp;
1.7 mycroft 821: int errno;
1.1 cgd 822: {
1.34 mycroft 823:
1.1 cgd 824: inp->inp_socket->so_error = errno;
825: sorwakeup(inp->inp_socket);
826: sowwakeup(inp->inp_socket);
827: }
828:
1.27 christos 829: void *
830: udp_ctlinput(cmd, sa, v)
1.1 cgd 831: int cmd;
832: struct sockaddr *sa;
1.27 christos 833: void *v;
1.1 cgd 834: {
1.66 augustss 835: struct ip *ip = v;
836: struct udphdr *uh;
1.18 mycroft 837: void (*notify) __P((struct inpcb *, int)) = udp_notify;
1.21 mycroft 838: int errno;
1.1 cgd 839:
1.53 itojun 840: if (sa->sa_family != AF_INET
841: || sa->sa_len != sizeof(struct sockaddr_in))
1.51 itojun 842: return NULL;
1.20 mycroft 843: if ((unsigned)cmd >= PRC_NCMDS)
1.27 christos 844: return NULL;
1.20 mycroft 845: errno = inetctlerrmap[cmd];
1.18 mycroft 846: if (PRC_IS_REDIRECT(cmd))
1.19 mycroft 847: notify = in_rtchange, ip = 0;
1.18 mycroft 848: else if (cmd == PRC_HOSTDEAD)
1.19 mycroft 849: ip = 0;
1.23 cgd 850: else if (errno == 0)
1.27 christos 851: return NULL;
1.19 mycroft 852: if (ip) {
1.1 cgd 853: uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
1.34 mycroft 854: in_pcbnotify(&udbtable, satosin(sa)->sin_addr, uh->uh_dport,
855: ip->ip_src, uh->uh_sport, errno, notify);
1.53 itojun 856:
857: /* XXX mapped address case */
1.19 mycroft 858: } else
1.34 mycroft 859: in_pcbnotifyall(&udbtable, satosin(sa)->sin_addr, errno,
860: notify);
1.27 christos 861: return NULL;
1.1 cgd 862: }
863:
1.7 mycroft 864: int
1.27 christos 865: #if __STDC__
866: udp_output(struct mbuf *m, ...)
867: #else
868: udp_output(m, va_alist)
869: struct mbuf *m;
870: va_dcl
871: #endif
872: {
1.66 augustss 873: struct inpcb *inp;
874: struct udpiphdr *ui;
875: int len = m->m_pkthdr.len;
1.31 mycroft 876: int error = 0;
1.27 christos 877: va_list ap;
878:
879: va_start(ap, m);
880: inp = va_arg(ap, struct inpcb *);
881: va_end(ap);
1.1 cgd 882:
883: /*
884: * Calculate data length and get a mbuf
885: * for UDP and IP headers.
886: */
1.13 mycroft 887: M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT);
888: if (m == 0) {
889: error = ENOBUFS;
1.39 thorpej 890: goto release;
891: }
892:
893: /*
894: * Compute the packet length of the IP header, and
895: * punt if the length looks bogus.
896: */
1.93.2.3! gehenna 897: if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) {
1.39 thorpej 898: error = EMSGSIZE;
1.13 mycroft 899: goto release;
900: }
1.1 cgd 901:
902: /*
903: * Fill in mbuf with extended UDP header
904: * and addresses and length put into network format.
905: */
906: ui = mtod(m, struct udpiphdr *);
907: ui->ui_pr = IPPROTO_UDP;
908: ui->ui_src = inp->inp_laddr;
909: ui->ui_dst = inp->inp_faddr;
910: ui->ui_sport = inp->inp_lport;
911: ui->ui_dport = inp->inp_fport;
1.78 thorpej 912: ui->ui_ulen = htons((u_int16_t)len + sizeof(struct udphdr));
1.1 cgd 913:
914: /*
1.78 thorpej 915: * Set up checksum and output datagram.
1.1 cgd 916: */
917: if (udpcksum) {
1.78 thorpej 918: /*
919: * XXX Cache pseudo-header checksum part for
920: * XXX "connected" UDP sockets.
921: */
922: ui->ui_sum = in_cksum_phdr(ui->ui_src.s_addr,
923: ui->ui_dst.s_addr, htons((u_int16_t)len +
924: sizeof(struct udphdr) + IPPROTO_UDP));
925: m->m_pkthdr.csum_flags = M_CSUM_UDPv4;
926: m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
927: } else
928: ui->ui_sum = 0;
1.93.2.3! gehenna 929: ((struct ip *)ui)->ip_len = htons(sizeof (struct udpiphdr) + len);
1.1 cgd 930: ((struct ip *)ui)->ip_ttl = inp->inp_ip.ip_ttl; /* XXX */
931: ((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; /* XXX */
932: udpstat.udps_opackets++;
1.48 itojun 933:
934: #ifdef IPSEC
1.75 itojun 935: if (ipsec_setsocket(m, inp->inp_socket) != 0) {
936: error = ENOBUFS;
937: goto release;
938: }
1.48 itojun 939: #endif /*IPSEC*/
940:
1.31 mycroft 941: return (ip_output(m, inp->inp_options, &inp->inp_route,
1.12 mycroft 942: inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST),
1.31 mycroft 943: inp->inp_moptions));
1.1 cgd 944:
945: release:
946: m_freem(m);
947: return (error);
948: }
949:
1.42 thorpej 950: int udp_sendspace = 9216; /* really max datagram size */
951: int udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in));
1.1 cgd 952: /* 40 1K datagrams */
953:
954: /*ARGSUSED*/
1.7 mycroft 955: int
1.31 mycroft 956: udp_usrreq(so, req, m, nam, control, p)
1.1 cgd 957: struct socket *so;
958: int req;
1.31 mycroft 959: struct mbuf *m, *nam, *control;
1.30 mycroft 960: struct proc *p;
1.1 cgd 961: {
1.66 augustss 962: struct inpcb *inp;
1.1 cgd 963: int s;
1.66 augustss 964: int error = 0;
1.1 cgd 965:
966: if (req == PRU_CONTROL)
1.31 mycroft 967: return (in_control(so, (long)m, (caddr_t)nam,
1.30 mycroft 968: (struct ifnet *)control, p));
1.59 thorpej 969:
1.60 thorpej 970: if (req == PRU_PURGEIF) {
1.80 itojun 971: in_pcbpurgeif0(&udbtable, (struct ifnet *)control);
1.60 thorpej 972: in_purgeif((struct ifnet *)control);
973: in_pcbpurgeif(&udbtable, (struct ifnet *)control);
1.59 thorpej 974: return (0);
975: }
1.31 mycroft 976:
977: s = splsoftnet();
978: inp = sotoinpcb(so);
1.32 mycroft 979: #ifdef DIAGNOSTIC
980: if (req != PRU_SEND && req != PRU_SENDOOB && control)
981: panic("udp_usrreq: unexpected control mbuf");
982: #endif
1.31 mycroft 983: if (inp == 0 && req != PRU_ATTACH) {
984: error = EINVAL;
985: goto release;
986: }
987:
1.1 cgd 988: /*
989: * Note: need to block udp_input while changing
990: * the udp pcb queue and/or pcb addresses.
991: */
992: switch (req) {
993:
994: case PRU_ATTACH:
1.31 mycroft 995: if (inp != 0) {
996: error = EISCONN;
1.1 cgd 997: break;
998: }
1.31 mycroft 999: if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
1000: error = soreserve(so, udp_sendspace, udp_recvspace);
1001: if (error)
1002: break;
1003: }
1.18 mycroft 1004: error = in_pcballoc(so, &udbtable);
1.1 cgd 1005: if (error)
1006: break;
1.31 mycroft 1007: inp = sotoinpcb(so);
1008: inp->inp_ip.ip_ttl = ip_defttl;
1.1 cgd 1009: break;
1010:
1011: case PRU_DETACH:
1.31 mycroft 1012: in_pcbdetach(inp);
1.1 cgd 1013: break;
1014:
1015: case PRU_BIND:
1.31 mycroft 1016: error = in_pcbbind(inp, nam, p);
1.1 cgd 1017: break;
1018:
1019: case PRU_LISTEN:
1020: error = EOPNOTSUPP;
1021: break;
1022:
1023: case PRU_CONNECT:
1.31 mycroft 1024: error = in_pcbconnect(inp, nam);
1025: if (error)
1.1 cgd 1026: break;
1.31 mycroft 1027: soisconnected(so);
1.1 cgd 1028: break;
1029:
1030: case PRU_CONNECT2:
1031: error = EOPNOTSUPP;
1032: break;
1033:
1034: case PRU_DISCONNECT:
1.31 mycroft 1035: /*soisdisconnected(so);*/
1036: so->so_state &= ~SS_ISCONNECTED; /* XXX */
1.1 cgd 1037: in_pcbdisconnect(inp);
1.34 mycroft 1038: inp->inp_laddr = zeroin_addr; /* XXX */
1.35 mycroft 1039: in_pcbstate(inp, INP_BOUND); /* XXX */
1.1 cgd 1040: break;
1041:
1042: case PRU_SHUTDOWN:
1043: socantsendmore(so);
1044: break;
1045:
1.31 mycroft 1046: case PRU_RCVD:
1047: error = EOPNOTSUPP;
1.1 cgd 1048: break;
1049:
1.31 mycroft 1050: case PRU_SEND:
1.32 mycroft 1051: if (control && control->m_len) {
1052: m_freem(control);
1053: m_freem(m);
1054: error = EINVAL;
1055: break;
1056: }
1.31 mycroft 1057: {
1.35 mycroft 1058: struct in_addr laddr; /* XXX */
1.1 cgd 1059:
1.31 mycroft 1060: if (nam) {
1.35 mycroft 1061: laddr = inp->inp_laddr; /* XXX */
1.31 mycroft 1062: if ((so->so_state & SS_ISCONNECTED) != 0) {
1063: error = EISCONN;
1.32 mycroft 1064: goto die;
1.31 mycroft 1065: }
1066: error = in_pcbconnect(inp, nam);
1.32 mycroft 1067: if (error) {
1068: die:
1069: m_freem(m);
1.31 mycroft 1070: break;
1.32 mycroft 1071: }
1.31 mycroft 1072: } else {
1073: if ((so->so_state & SS_ISCONNECTED) == 0) {
1074: error = ENOTCONN;
1.32 mycroft 1075: goto die;
1.31 mycroft 1076: }
1077: }
1.33 mycroft 1078: error = udp_output(m, inp);
1.31 mycroft 1079: if (nam) {
1080: in_pcbdisconnect(inp);
1.35 mycroft 1081: inp->inp_laddr = laddr; /* XXX */
1082: in_pcbstate(inp, INP_BOUND); /* XXX */
1.31 mycroft 1083: }
1084: }
1.1 cgd 1085: break;
1086:
1087: case PRU_SENSE:
1088: /*
1089: * stat: don't bother with a blocksize.
1090: */
1.31 mycroft 1091: splx(s);
1.1 cgd 1092: return (0);
1093:
1.31 mycroft 1094: case PRU_RCVOOB:
1095: error = EOPNOTSUPP;
1096: break;
1097:
1.1 cgd 1098: case PRU_SENDOOB:
1.32 mycroft 1099: m_freem(control);
1.31 mycroft 1100: m_freem(m);
1.1 cgd 1101: error = EOPNOTSUPP;
1102: break;
1103:
1.31 mycroft 1104: case PRU_SOCKADDR:
1105: in_setsockaddr(inp, nam);
1106: break;
1107:
1108: case PRU_PEERADDR:
1109: in_setpeeraddr(inp, nam);
1110: break;
1.1 cgd 1111:
1112: default:
1113: panic("udp_usrreq");
1114: }
1115:
1116: release:
1.31 mycroft 1117: splx(s);
1.1 cgd 1118: return (error);
1.13 mycroft 1119: }
1120:
1121: /*
1122: * Sysctl for udp variables.
1123: */
1.27 christos 1124: int
1.13 mycroft 1125: udp_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
1126: int *name;
1127: u_int namelen;
1128: void *oldp;
1129: size_t *oldlenp;
1130: void *newp;
1131: size_t newlen;
1132: {
1133: /* All sysctl names at this level are terminal. */
1134: if (namelen != 1)
1135: return (ENOTDIR);
1136:
1137: switch (name[0]) {
1138: case UDPCTL_CHECKSUM:
1139: return (sysctl_int(oldp, oldlenp, newp, newlen, &udpcksum));
1.42 thorpej 1140: case UDPCTL_SENDSPACE:
1141: return (sysctl_int(oldp, oldlenp, newp, newlen,
1142: &udp_sendspace));
1143: case UDPCTL_RECVSPACE:
1.93.2.1 gehenna 1144: return (sysctl_int(oldp, oldlenp, newp, newlen,
1.42 thorpej 1145: &udp_recvspace));
1.13 mycroft 1146: default:
1147: return (ENOPROTOOPT);
1148: }
1149: /* NOTREACHED */
1.1 cgd 1150: }
1.72 itojun 1151: #endif
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