Annotation of src/sys/netinet/udp_usrreq.c, Revision 1.98
1.98 ! matt 1: /* $NetBSD: udp_usrreq.c,v 1.97 2003/01/20 00:05:46 simonb Exp $ */
1.48 itojun 2:
3: /*
4: * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
5: * All rights reserved.
1.94 itojun 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.
1.94 itojun 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>
1.98 ! matt 68: __KERNEL_RCSID(0, "$NetBSD: udp_usrreq.c,v 1.97 2003/01/20 00:05:46 simonb 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:
1.98 ! matt 166: #ifdef MBUFTRACE
! 167: struct mowner udp_mowner = { "udp" };
! 168: struct mowner udp_rx_mowner = { "udp", "rx" };
! 169: struct mowner udp_tx_mowner = { "udp", "tx" };
! 170: #endif
! 171:
1.78 thorpej 172: #ifdef UDP_CSUM_COUNTERS
173: #include <sys/device.h>
174:
175: struct evcnt udp_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
176: NULL, "udp", "hwcsum bad");
177: struct evcnt udp_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
178: NULL, "udp", "hwcsum ok");
179: struct evcnt udp_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
180: NULL, "udp", "hwcsum data");
181: struct evcnt udp_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
182: NULL, "udp", "swcsum");
183:
184: #define UDP_CSUM_COUNTER_INCR(ev) (ev)->ev_count++
185:
186: #else
187:
188: #define UDP_CSUM_COUNTER_INCR(ev) /* nothing */
189:
190: #endif /* UDP_CSUM_COUNTERS */
191:
1.7 mycroft 192: void
1.1 cgd 193: udp_init()
194: {
1.18 mycroft 195:
1.72 itojun 196: #ifdef INET
1.35 mycroft 197: in_pcbinit(&udbtable, udbhashsize, udbhashsize);
1.72 itojun 198: #endif
1.78 thorpej 199:
200: #ifdef UDP_CSUM_COUNTERS
201: evcnt_attach_static(&udp_hwcsum_bad);
202: evcnt_attach_static(&udp_hwcsum_ok);
203: evcnt_attach_static(&udp_hwcsum_data);
204: evcnt_attach_static(&udp_swcsum);
205: #endif /* UDP_CSUM_COUNTERS */
1.98 ! matt 206:
! 207: MOWNER_ATTACH(&udp_tx_mowner);
! 208: MOWNER_ATTACH(&udp_rx_mowner);
! 209: MOWNER_ATTACH(&udp_mowner);
1.1 cgd 210: }
211:
1.72 itojun 212: #ifdef INET
1.7 mycroft 213: void
1.27 christos 214: #if __STDC__
215: udp_input(struct mbuf *m, ...)
216: #else
217: udp_input(m, va_alist)
218: struct mbuf *m;
219: va_dcl
220: #endif
1.1 cgd 221: {
1.53 itojun 222: va_list ap;
223: struct sockaddr_in src, dst;
224: struct ip *ip;
225: struct udphdr *uh;
1.97 simonb 226: int iphlen;
1.53 itojun 227: int len;
228: int n;
1.96 itojun 229: u_int16_t ip_len;
1.53 itojun 230:
231: va_start(ap, m);
232: iphlen = va_arg(ap, int);
1.97 simonb 233: (void)va_arg(ap, int); /* ignore value, advance ap */
1.53 itojun 234: va_end(ap);
235:
1.98 ! matt 236: MCLAIM(m, &udp_rx_mowner);
1.53 itojun 237: udpstat.udps_ipackets++;
238:
239: #ifndef PULLDOWN_TEST
240: /*
241: * Strip IP options, if any; should skip this,
242: * make available to user, and use on returned packets,
243: * but we don't yet have a way to check the checksum
244: * with options still present.
245: */
246: if (iphlen > sizeof (struct ip)) {
247: ip_stripoptions(m, (struct mbuf *)0);
248: iphlen = sizeof(struct ip);
249: }
250: #else
251: /*
252: * we may enable the above code if we save and pass IPv4 options
253: * to the userland.
254: */
255: #endif
256:
257: /*
258: * Get IP and UDP header together in first mbuf.
259: */
260: ip = mtod(m, struct ip *);
261: #ifndef PULLDOWN_TEST
262: if (m->m_len < iphlen + sizeof(struct udphdr)) {
263: if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == 0) {
264: udpstat.udps_hdrops++;
265: return;
266: }
267: ip = mtod(m, struct ip *);
268: }
269: uh = (struct udphdr *)((caddr_t)ip + iphlen);
270: #else
271: IP6_EXTHDR_GET(uh, struct udphdr *, m, iphlen, sizeof(struct udphdr));
272: if (uh == NULL) {
273: udpstat.udps_hdrops++;
274: return;
275: }
276: #endif
1.95 thorpej 277: KASSERT(UDP_HDR_ALIGNED_P(uh));
1.53 itojun 278:
1.57 itojun 279: /* destination port of 0 is illegal, based on RFC768. */
280: if (uh->uh_dport == 0)
281: goto bad;
282:
1.53 itojun 283: /*
284: * Make mbuf data length reflect UDP length.
285: * If not enough data to reflect UDP length, drop.
286: */
1.96 itojun 287: ip_len = ntohs(ip->ip_len);
1.53 itojun 288: len = ntohs((u_int16_t)uh->uh_ulen);
1.96 itojun 289: if (ip_len != iphlen + len) {
290: if (ip_len < iphlen + len || len < sizeof(struct udphdr)) {
1.53 itojun 291: udpstat.udps_badlen++;
292: goto bad;
293: }
1.96 itojun 294: m_adj(m, iphlen + len - ip_len);
1.53 itojun 295: }
296:
297: /*
298: * Checksum extended UDP header and data.
299: */
300: if (uh->uh_sum) {
1.78 thorpej 301: switch (m->m_pkthdr.csum_flags &
1.84 thorpej 302: ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv4) |
1.78 thorpej 303: M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) {
304: case M_CSUM_UDPv4|M_CSUM_TCP_UDP_BAD:
305: UDP_CSUM_COUNTER_INCR(&udp_hwcsum_bad);
306: goto badcsum;
307:
308: case M_CSUM_UDPv4|M_CSUM_DATA:
309: UDP_CSUM_COUNTER_INCR(&udp_hwcsum_data);
310: if ((m->m_pkthdr.csum_data ^ 0xffff) != 0)
311: goto badcsum;
312: break;
313:
314: case M_CSUM_UDPv4:
315: /* Checksum was okay. */
316: UDP_CSUM_COUNTER_INCR(&udp_hwcsum_ok);
317: break;
318:
319: default:
320: /* Need to compute it ourselves. */
321: UDP_CSUM_COUNTER_INCR(&udp_swcsum);
322: if (in4_cksum(m, IPPROTO_UDP, iphlen, len) != 0)
323: goto badcsum;
324: break;
1.53 itojun 325: }
326: }
327:
328: /* construct source and dst sockaddrs. */
329: bzero(&src, sizeof(src));
330: src.sin_family = AF_INET;
331: src.sin_len = sizeof(struct sockaddr_in);
332: bcopy(&ip->ip_src, &src.sin_addr, sizeof(src.sin_addr));
333: src.sin_port = uh->uh_sport;
334: bzero(&dst, sizeof(dst));
335: dst.sin_family = AF_INET;
336: dst.sin_len = sizeof(struct sockaddr_in);
337: bcopy(&ip->ip_dst, &dst.sin_addr, sizeof(dst.sin_addr));
338: dst.sin_port = uh->uh_dport;
339:
340: n = udp4_realinput(&src, &dst, m, iphlen);
341: #ifdef INET6
342: if (IN_MULTICAST(ip->ip_dst.s_addr) || n == 0) {
343: struct sockaddr_in6 src6, dst6;
344:
345: bzero(&src6, sizeof(src6));
346: src6.sin6_family = AF_INET6;
347: src6.sin6_len = sizeof(struct sockaddr_in6);
348: src6.sin6_addr.s6_addr[10] = src6.sin6_addr.s6_addr[11] = 0xff;
349: bcopy(&ip->ip_src, &src6.sin6_addr.s6_addr[12],
350: sizeof(ip->ip_src));
351: src6.sin6_port = uh->uh_sport;
352: bzero(&dst6, sizeof(dst6));
353: dst6.sin6_family = AF_INET6;
354: dst6.sin6_len = sizeof(struct sockaddr_in6);
355: dst6.sin6_addr.s6_addr[10] = dst6.sin6_addr.s6_addr[11] = 0xff;
356: bcopy(&ip->ip_dst, &dst6.sin6_addr.s6_addr[12],
357: sizeof(ip->ip_dst));
358: dst6.sin6_port = uh->uh_dport;
359:
360: n += udp6_realinput(AF_INET, &src6, &dst6, m, iphlen);
361: }
362: #endif
363:
364: if (n == 0) {
365: if (m->m_flags & (M_BCAST | M_MCAST)) {
366: udpstat.udps_noportbcast++;
367: goto bad;
368: }
1.61 itojun 369: udpstat.udps_noport++;
1.64 ws 370: #ifdef IPKDB
1.53 itojun 371: if (checkipkdb(&ip->ip_src, uh->uh_sport, uh->uh_dport,
372: m, iphlen + sizeof(struct udphdr),
373: m->m_pkthdr.len - iphlen - sizeof(struct udphdr))) {
374: /*
375: * It was a debugger connect packet,
376: * just drop it now
377: */
378: goto bad;
379: }
380: #endif
381: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
382: m = NULL;
383: }
384:
385: bad:
386: if (m)
387: m_freem(m);
1.78 thorpej 388: return;
389:
390: badcsum:
391: m_freem(m);
392: udpstat.udps_badsum++;
1.53 itojun 393: }
1.72 itojun 394: #endif
1.53 itojun 395:
396: #ifdef INET6
397: int
398: udp6_input(mp, offp, proto)
399: struct mbuf **mp;
400: int *offp, proto;
401: {
402: struct mbuf *m = *mp;
403: int off = *offp;
404: struct sockaddr_in6 src, dst;
405: struct ip6_hdr *ip6;
406: struct udphdr *uh;
407: u_int32_t plen, ulen;
408:
1.76 itojun 409: #ifndef PULLDOWN_TEST
410: IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE);
411: #endif
412: ip6 = mtod(m, struct ip6_hdr *);
413:
1.53 itojun 414: #if defined(NFAITH) && 0 < NFAITH
1.76 itojun 415: if (faithprefix(&ip6->ip6_dst)) {
416: /* send icmp6 host unreach? */
417: m_freem(m);
418: return IPPROTO_DONE;
1.53 itojun 419: }
420: #endif
421:
422: udp6stat.udp6s_ipackets++;
423:
424: /* check for jumbogram is done in ip6_input. we can trust pkthdr.len */
425: plen = m->m_pkthdr.len - off;
426: #ifndef PULLDOWN_TEST
427: uh = (struct udphdr *)((caddr_t)ip6 + off);
428: #else
429: IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(struct udphdr));
430: if (uh == NULL) {
431: ip6stat.ip6s_tooshort++;
432: return IPPROTO_DONE;
433: }
434: #endif
1.95 thorpej 435: KASSERT(UDP_HDR_ALIGNED_P(uh));
1.53 itojun 436: ulen = ntohs((u_short)uh->uh_ulen);
1.69 itojun 437: /*
438: * RFC2675 section 4: jumbograms will have 0 in the UDP header field,
439: * iff payload length > 0xffff.
440: */
1.53 itojun 441: if (ulen == 0 && plen > 0xffff)
442: ulen = plen;
443:
444: if (plen != ulen) {
445: udp6stat.udp6s_badlen++;
1.54 itojun 446: goto bad;
447: }
448:
1.57 itojun 449: /* destination port of 0 is illegal, based on RFC768. */
450: if (uh->uh_dport == 0)
451: goto bad;
452:
1.54 itojun 453: /* Be proactive about malicious use of IPv4 mapped address */
454: if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
455: IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
456: /* XXX stat */
1.53 itojun 457: goto bad;
458: }
459:
460: /*
461: * Checksum extended UDP header and data.
462: */
463: if (uh->uh_sum == 0)
464: udp6stat.udp6s_nosum++;
465: else if (in6_cksum(m, IPPROTO_UDP, off, ulen) != 0) {
466: udp6stat.udp6s_badsum++;
467: goto bad;
468: }
469:
470: /*
471: * Construct source and dst sockaddrs.
472: * Note that ifindex (s6_addr16[1]) is already filled.
473: */
474: bzero(&src, sizeof(src));
475: src.sin6_family = AF_INET6;
476: src.sin6_len = sizeof(struct sockaddr_in6);
1.69 itojun 477: /* KAME hack: recover scopeid */
478: (void)in6_recoverscope(&src, &ip6->ip6_src, m->m_pkthdr.rcvif);
1.53 itojun 479: src.sin6_port = uh->uh_sport;
480: bzero(&dst, sizeof(dst));
481: dst.sin6_family = AF_INET6;
482: dst.sin6_len = sizeof(struct sockaddr_in6);
1.69 itojun 483: /* KAME hack: recover scopeid */
484: (void)in6_recoverscope(&dst, &ip6->ip6_dst, m->m_pkthdr.rcvif);
1.53 itojun 485: dst.sin6_port = uh->uh_dport;
486:
487: if (udp6_realinput(AF_INET6, &src, &dst, m, off) == 0) {
488: if (m->m_flags & M_MCAST) {
489: udp6stat.udp6s_noportmcast++;
490: goto bad;
491: }
1.61 itojun 492: udp6stat.udp6s_noport++;
1.53 itojun 493: icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
494: m = NULL;
495: }
496:
497: bad:
498: if (m)
499: m_freem(m);
500: return IPPROTO_DONE;
501: }
502: #endif
503:
1.72 itojun 504: #ifdef INET
1.53 itojun 505: static void
506: udp4_sendup(m, off, src, so)
507: struct mbuf *m;
508: int off; /* offset of data portion */
509: struct sockaddr *src;
510: struct socket *so;
511: {
512: struct mbuf *opts = NULL;
513: struct mbuf *n;
514: struct inpcb *inp = NULL;
515:
516: if (!so)
517: return;
518: switch (so->so_proto->pr_domain->dom_family) {
519: case AF_INET:
520: inp = sotoinpcb(so);
521: break;
522: #ifdef INET6
523: case AF_INET6:
524: break;
525: #endif
526: default:
527: return;
528: }
529:
530: #ifdef IPSEC
531: /* check AH/ESP integrity. */
532: if (so != NULL && ipsec4_in_reject_so(m, so)) {
533: ipsecstat.in_polvio++;
534: return;
535: }
536: #endif /*IPSEC*/
537:
538: if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
539: if (inp && (inp->inp_flags & INP_CONTROLOPTS
540: || so->so_options & SO_TIMESTAMP)) {
541: struct ip *ip = mtod(n, struct ip *);
542: ip_savecontrol(inp, &opts, ip, n);
543: }
544:
545: m_adj(n, off);
546: if (sbappendaddr(&so->so_rcv, src, n,
547: opts) == 0) {
548: m_freem(n);
549: if (opts)
550: m_freem(opts);
1.81 enami 551: udpstat.udps_fullsock++;
1.53 itojun 552: } else
553: sorwakeup(so);
554: }
555: }
1.72 itojun 556: #endif
1.53 itojun 557:
558: #ifdef INET6
559: static void
560: udp6_sendup(m, off, src, so)
561: struct mbuf *m;
562: int off; /* offset of data portion */
563: struct sockaddr *src;
564: struct socket *so;
565: {
566: struct mbuf *opts = NULL;
567: struct mbuf *n;
568: struct in6pcb *in6p = NULL;
569:
570: if (!so)
571: return;
572: if (so->so_proto->pr_domain->dom_family != AF_INET6)
573: return;
574: in6p = sotoin6pcb(so);
575:
576: #ifdef IPSEC
577: /* check AH/ESP integrity. */
578: if (so != NULL && ipsec6_in_reject_so(m, so)) {
579: ipsec6stat.in_polvio++;
580: return;
581: }
582: #endif /*IPSEC*/
583:
584: if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
585: if (in6p && (in6p->in6p_flags & IN6P_CONTROLOPTS
586: || in6p->in6p_socket->so_options & SO_TIMESTAMP)) {
587: struct ip6_hdr *ip6 = mtod(n, struct ip6_hdr *);
588: ip6_savecontrol(in6p, &opts, ip6, n);
589: }
590:
591: m_adj(n, off);
592: if (sbappendaddr(&so->so_rcv, src, n, opts) == 0) {
593: m_freem(n);
594: if (opts)
595: m_freem(opts);
596: udp6stat.udp6s_fullsock++;
597: } else
598: sorwakeup(so);
599: }
600: }
601: #endif
602:
1.72 itojun 603: #ifdef INET
1.53 itojun 604: static int
605: udp4_realinput(src, dst, m, off)
606: struct sockaddr_in *src;
607: struct sockaddr_in *dst;
608: struct mbuf *m;
609: int off; /* offset of udphdr */
610: {
611: u_int16_t *sport, *dport;
612: int rcvcnt;
613: struct in_addr *src4, *dst4;
614: struct inpcb *inp;
615:
616: rcvcnt = 0;
617: off += sizeof(struct udphdr); /* now, offset of payload */
618:
619: if (src->sin_family != AF_INET || dst->sin_family != AF_INET)
620: goto bad;
621:
622: src4 = &src->sin_addr;
623: sport = &src->sin_port;
624: dst4 = &dst->sin_addr;
625: dport = &dst->sin_port;
626:
1.73 itojun 627: if (IN_MULTICAST(dst4->s_addr) ||
1.53 itojun 628: in_broadcast(*dst4, m->m_pkthdr.rcvif)) {
629: /*
630: * Deliver a multicast or broadcast datagram to *all* sockets
631: * for which the local and remote addresses and ports match
632: * those of the incoming datagram. This allows more than
633: * one process to receive multi/broadcasts on the same port.
634: * (This really ought to be done for unicast datagrams as
635: * well, but that would cause problems with existing
636: * applications that open both address-specific sockets and
637: * a wildcard socket listening to the same port -- they would
638: * end up receiving duplicates of every unicast datagram.
639: * Those applications open the multiple sockets to overcome an
640: * inadequacy of the UDP socket interface, but for backwards
641: * compatibility we avoid the problem here rather than
642: * fixing the interface. Maybe 4.5BSD will remedy this?)
643: */
644:
645: /*
1.92 itojun 646: * KAME note: traditionally we dropped udpiphdr from mbuf here.
1.71 itojun 647: * we need udpiphdr for IPsec processing so we do that later.
1.53 itojun 648: */
649: /*
650: * Locate pcb(s) for datagram.
651: */
1.89 matt 652: CIRCLEQ_FOREACH(inp, &udbtable.inpt_queue, inp_queue) {
1.53 itojun 653: if (inp->inp_lport != *dport)
654: continue;
655: if (!in_nullhost(inp->inp_laddr)) {
656: if (!in_hosteq(inp->inp_laddr, *dst4))
657: continue;
658: }
659: if (!in_nullhost(inp->inp_faddr)) {
660: if (!in_hosteq(inp->inp_faddr, *src4) ||
661: inp->inp_fport != *sport)
662: continue;
663: }
664:
665: udp4_sendup(m, off, (struct sockaddr *)src,
666: inp->inp_socket);
667: rcvcnt++;
668:
669: /*
670: * Don't look for additional matches if this one does
671: * not have either the SO_REUSEPORT or SO_REUSEADDR
672: * socket options set. This heuristic avoids searching
673: * through all pcbs in the common case of a non-shared
674: * port. It assumes that an application will never
675: * clear these options after setting them.
676: */
677: if ((inp->inp_socket->so_options &
678: (SO_REUSEPORT|SO_REUSEADDR)) == 0)
679: break;
680: }
681: } else {
682: /*
683: * Locate pcb for datagram.
684: */
685: inp = in_pcblookup_connect(&udbtable, *src4, *sport, *dst4, *dport);
686: if (inp == 0) {
687: ++udpstat.udps_pcbhashmiss;
688: inp = in_pcblookup_bind(&udbtable, *dst4, *dport);
1.82 itojun 689: if (inp == 0)
1.53 itojun 690: return rcvcnt;
691: }
692:
693: udp4_sendup(m, off, (struct sockaddr *)src, inp->inp_socket);
694: rcvcnt++;
695: }
696:
697: bad:
698: return rcvcnt;
699: }
1.72 itojun 700: #endif
1.53 itojun 701:
702: #ifdef INET6
703: static int
704: udp6_realinput(af, src, dst, m, off)
705: int af; /* af on packet */
706: struct sockaddr_in6 *src;
707: struct sockaddr_in6 *dst;
708: struct mbuf *m;
709: int off; /* offset of udphdr */
710: {
1.79 itojun 711: u_int16_t sport, dport;
1.53 itojun 712: int rcvcnt;
1.79 itojun 713: struct in6_addr src6, dst6;
714: const struct in_addr *dst4;
1.53 itojun 715: struct in6pcb *in6p;
716:
717: rcvcnt = 0;
718: off += sizeof(struct udphdr); /* now, offset of payload */
719:
720: if (af != AF_INET && af != AF_INET6)
721: goto bad;
722: if (src->sin6_family != AF_INET6 || dst->sin6_family != AF_INET6)
723: goto bad;
724:
1.79 itojun 725: in6_embedscope(&src6, src, NULL, NULL);
726: sport = src->sin6_port;
727: in6_embedscope(&dst6, dst, NULL, NULL);
728: dport = dst->sin6_port;
1.88 itojun 729: dst4 = (struct in_addr *)&dst->sin6_addr.s6_addr[12];
1.53 itojun 730:
1.79 itojun 731: if (IN6_IS_ADDR_MULTICAST(&dst6) ||
732: (af == AF_INET && IN_MULTICAST(dst4->s_addr))) {
1.53 itojun 733: /*
734: * Deliver a multicast or broadcast datagram to *all* sockets
735: * for which the local and remote addresses and ports match
736: * those of the incoming datagram. This allows more than
737: * one process to receive multi/broadcasts on the same port.
738: * (This really ought to be done for unicast datagrams as
739: * well, but that would cause problems with existing
740: * applications that open both address-specific sockets and
741: * a wildcard socket listening to the same port -- they would
742: * end up receiving duplicates of every unicast datagram.
743: * Those applications open the multiple sockets to overcome an
744: * inadequacy of the UDP socket interface, but for backwards
745: * compatibility we avoid the problem here rather than
746: * fixing the interface. Maybe 4.5BSD will remedy this?)
747: */
748:
749: /*
1.92 itojun 750: * KAME note: traditionally we dropped udpiphdr from mbuf here.
1.71 itojun 751: * we need udpiphdr for IPsec processing so we do that later.
1.53 itojun 752: */
753: /*
754: * Locate pcb(s) for datagram.
755: */
756: for (in6p = udb6.in6p_next; in6p != &udb6;
757: in6p = in6p->in6p_next) {
1.79 itojun 758: if (in6p->in6p_lport != dport)
1.53 itojun 759: continue;
760: if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
1.90 itojun 761: if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &dst6))
1.53 itojun 762: continue;
1.92 itojun 763: } else {
1.79 itojun 764: if (IN6_IS_ADDR_V4MAPPED(&dst6) &&
1.85 itojun 765: (in6p->in6p_flags & IN6P_IPV6_V6ONLY))
1.55 itojun 766: continue;
767: }
1.53 itojun 768: if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
1.79 itojun 769: if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr,
770: &src6) || in6p->in6p_fport != sport)
1.53 itojun 771: continue;
1.92 itojun 772: } else {
1.79 itojun 773: if (IN6_IS_ADDR_V4MAPPED(&src6) &&
1.85 itojun 774: (in6p->in6p_flags & IN6P_IPV6_V6ONLY))
1.55 itojun 775: continue;
776: }
1.53 itojun 777:
778: udp6_sendup(m, off, (struct sockaddr *)src,
779: in6p->in6p_socket);
780: rcvcnt++;
781:
782: /*
783: * Don't look for additional matches if this one does
784: * not have either the SO_REUSEPORT or SO_REUSEADDR
785: * socket options set. This heuristic avoids searching
786: * through all pcbs in the common case of a non-shared
787: * port. It assumes that an application will never
788: * clear these options after setting them.
789: */
790: if ((in6p->in6p_socket->so_options &
791: (SO_REUSEPORT|SO_REUSEADDR)) == 0)
792: break;
793: }
794: } else {
795: /*
796: * Locate pcb for datagram.
797: */
1.79 itojun 798: in6p = in6_pcblookup_connect(&udb6, &src6, sport,
799: &dst6, dport, 0);
1.53 itojun 800: if (in6p == 0) {
801: ++udpstat.udps_pcbhashmiss;
1.79 itojun 802: in6p = in6_pcblookup_bind(&udb6, &dst6, dport, 0);
1.82 itojun 803: if (in6p == 0)
1.53 itojun 804: return rcvcnt;
805: }
806:
807: udp6_sendup(m, off, (struct sockaddr *)src, in6p->in6p_socket);
808: rcvcnt++;
809: }
810:
811: bad:
812: return rcvcnt;
813: }
814: #endif
1.1 cgd 815:
1.72 itojun 816: #ifdef INET
1.1 cgd 817: /*
818: * Notify a udp user of an asynchronous error;
819: * just wake up so that he can collect error status.
820: */
1.7 mycroft 821: static void
1.1 cgd 822: udp_notify(inp, errno)
1.66 augustss 823: struct inpcb *inp;
1.7 mycroft 824: int errno;
1.1 cgd 825: {
1.34 mycroft 826:
1.1 cgd 827: inp->inp_socket->so_error = errno;
828: sorwakeup(inp->inp_socket);
829: sowwakeup(inp->inp_socket);
830: }
831:
1.27 christos 832: void *
833: udp_ctlinput(cmd, sa, v)
1.1 cgd 834: int cmd;
835: struct sockaddr *sa;
1.27 christos 836: void *v;
1.1 cgd 837: {
1.66 augustss 838: struct ip *ip = v;
839: struct udphdr *uh;
1.18 mycroft 840: void (*notify) __P((struct inpcb *, int)) = udp_notify;
1.21 mycroft 841: int errno;
1.1 cgd 842:
1.53 itojun 843: if (sa->sa_family != AF_INET
844: || sa->sa_len != sizeof(struct sockaddr_in))
1.51 itojun 845: return NULL;
1.20 mycroft 846: if ((unsigned)cmd >= PRC_NCMDS)
1.27 christos 847: return NULL;
1.20 mycroft 848: errno = inetctlerrmap[cmd];
1.18 mycroft 849: if (PRC_IS_REDIRECT(cmd))
1.19 mycroft 850: notify = in_rtchange, ip = 0;
1.18 mycroft 851: else if (cmd == PRC_HOSTDEAD)
1.19 mycroft 852: ip = 0;
1.23 cgd 853: else if (errno == 0)
1.27 christos 854: return NULL;
1.19 mycroft 855: if (ip) {
1.1 cgd 856: uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
1.34 mycroft 857: in_pcbnotify(&udbtable, satosin(sa)->sin_addr, uh->uh_dport,
858: ip->ip_src, uh->uh_sport, errno, notify);
1.53 itojun 859:
860: /* XXX mapped address case */
1.19 mycroft 861: } else
1.34 mycroft 862: in_pcbnotifyall(&udbtable, satosin(sa)->sin_addr, errno,
863: notify);
1.27 christos 864: return NULL;
1.1 cgd 865: }
866:
1.7 mycroft 867: int
1.27 christos 868: #if __STDC__
869: udp_output(struct mbuf *m, ...)
870: #else
871: udp_output(m, va_alist)
872: struct mbuf *m;
873: va_dcl
874: #endif
875: {
1.66 augustss 876: struct inpcb *inp;
877: struct udpiphdr *ui;
878: int len = m->m_pkthdr.len;
1.31 mycroft 879: int error = 0;
1.27 christos 880: va_list ap;
881:
1.98 ! matt 882: MCLAIM(m, &udp_tx_mowner);
1.27 christos 883: va_start(ap, m);
884: inp = va_arg(ap, struct inpcb *);
885: va_end(ap);
1.1 cgd 886:
887: /*
888: * Calculate data length and get a mbuf
889: * for UDP and IP headers.
890: */
1.13 mycroft 891: M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT);
892: if (m == 0) {
893: error = ENOBUFS;
1.39 thorpej 894: goto release;
895: }
896:
897: /*
898: * Compute the packet length of the IP header, and
899: * punt if the length looks bogus.
900: */
1.96 itojun 901: if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) {
1.39 thorpej 902: error = EMSGSIZE;
1.13 mycroft 903: goto release;
904: }
1.1 cgd 905:
906: /*
907: * Fill in mbuf with extended UDP header
908: * and addresses and length put into network format.
909: */
910: ui = mtod(m, struct udpiphdr *);
911: ui->ui_pr = IPPROTO_UDP;
912: ui->ui_src = inp->inp_laddr;
913: ui->ui_dst = inp->inp_faddr;
914: ui->ui_sport = inp->inp_lport;
915: ui->ui_dport = inp->inp_fport;
1.78 thorpej 916: ui->ui_ulen = htons((u_int16_t)len + sizeof(struct udphdr));
1.1 cgd 917:
918: /*
1.78 thorpej 919: * Set up checksum and output datagram.
1.1 cgd 920: */
921: if (udpcksum) {
1.78 thorpej 922: /*
923: * XXX Cache pseudo-header checksum part for
924: * XXX "connected" UDP sockets.
925: */
926: ui->ui_sum = in_cksum_phdr(ui->ui_src.s_addr,
927: ui->ui_dst.s_addr, htons((u_int16_t)len +
928: sizeof(struct udphdr) + IPPROTO_UDP));
929: m->m_pkthdr.csum_flags = M_CSUM_UDPv4;
930: m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
931: } else
932: ui->ui_sum = 0;
1.96 itojun 933: ((struct ip *)ui)->ip_len = htons(sizeof (struct udpiphdr) + len);
1.1 cgd 934: ((struct ip *)ui)->ip_ttl = inp->inp_ip.ip_ttl; /* XXX */
935: ((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; /* XXX */
936: udpstat.udps_opackets++;
1.48 itojun 937:
938: #ifdef IPSEC
1.75 itojun 939: if (ipsec_setsocket(m, inp->inp_socket) != 0) {
940: error = ENOBUFS;
941: goto release;
942: }
1.48 itojun 943: #endif /*IPSEC*/
944:
1.31 mycroft 945: return (ip_output(m, inp->inp_options, &inp->inp_route,
1.12 mycroft 946: inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST),
1.31 mycroft 947: inp->inp_moptions));
1.1 cgd 948:
949: release:
950: m_freem(m);
951: return (error);
952: }
953:
1.42 thorpej 954: int udp_sendspace = 9216; /* really max datagram size */
955: int udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in));
1.1 cgd 956: /* 40 1K datagrams */
957:
958: /*ARGSUSED*/
1.7 mycroft 959: int
1.31 mycroft 960: udp_usrreq(so, req, m, nam, control, p)
1.1 cgd 961: struct socket *so;
962: int req;
1.31 mycroft 963: struct mbuf *m, *nam, *control;
1.30 mycroft 964: struct proc *p;
1.1 cgd 965: {
1.66 augustss 966: struct inpcb *inp;
1.1 cgd 967: int s;
1.66 augustss 968: int error = 0;
1.1 cgd 969:
970: if (req == PRU_CONTROL)
1.31 mycroft 971: return (in_control(so, (long)m, (caddr_t)nam,
1.30 mycroft 972: (struct ifnet *)control, p));
1.59 thorpej 973:
1.60 thorpej 974: if (req == PRU_PURGEIF) {
1.80 itojun 975: in_pcbpurgeif0(&udbtable, (struct ifnet *)control);
1.60 thorpej 976: in_purgeif((struct ifnet *)control);
977: in_pcbpurgeif(&udbtable, (struct ifnet *)control);
1.59 thorpej 978: return (0);
979: }
1.31 mycroft 980:
981: s = splsoftnet();
982: inp = sotoinpcb(so);
1.32 mycroft 983: #ifdef DIAGNOSTIC
984: if (req != PRU_SEND && req != PRU_SENDOOB && control)
985: panic("udp_usrreq: unexpected control mbuf");
986: #endif
1.31 mycroft 987: if (inp == 0 && req != PRU_ATTACH) {
988: error = EINVAL;
989: goto release;
990: }
991:
1.1 cgd 992: /*
993: * Note: need to block udp_input while changing
994: * the udp pcb queue and/or pcb addresses.
995: */
996: switch (req) {
997:
998: case PRU_ATTACH:
1.31 mycroft 999: if (inp != 0) {
1000: error = EISCONN;
1.1 cgd 1001: break;
1002: }
1.98 ! matt 1003: #ifdef MBUFTRACE
! 1004: so->so_mowner = &udp_mowner;
! 1005: so->so_rcv.sb_mowner = &udp_rx_mowner;
! 1006: so->so_snd.sb_mowner = &udp_tx_mowner;
! 1007: #endif
1.31 mycroft 1008: if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
1009: error = soreserve(so, udp_sendspace, udp_recvspace);
1010: if (error)
1011: break;
1012: }
1.18 mycroft 1013: error = in_pcballoc(so, &udbtable);
1.1 cgd 1014: if (error)
1015: break;
1.31 mycroft 1016: inp = sotoinpcb(so);
1017: inp->inp_ip.ip_ttl = ip_defttl;
1.1 cgd 1018: break;
1019:
1020: case PRU_DETACH:
1.31 mycroft 1021: in_pcbdetach(inp);
1.1 cgd 1022: break;
1023:
1024: case PRU_BIND:
1.31 mycroft 1025: error = in_pcbbind(inp, nam, p);
1.1 cgd 1026: break;
1027:
1028: case PRU_LISTEN:
1029: error = EOPNOTSUPP;
1030: break;
1031:
1032: case PRU_CONNECT:
1.31 mycroft 1033: error = in_pcbconnect(inp, nam);
1034: if (error)
1.1 cgd 1035: break;
1.31 mycroft 1036: soisconnected(so);
1.1 cgd 1037: break;
1038:
1039: case PRU_CONNECT2:
1040: error = EOPNOTSUPP;
1041: break;
1042:
1043: case PRU_DISCONNECT:
1.31 mycroft 1044: /*soisdisconnected(so);*/
1045: so->so_state &= ~SS_ISCONNECTED; /* XXX */
1.1 cgd 1046: in_pcbdisconnect(inp);
1.34 mycroft 1047: inp->inp_laddr = zeroin_addr; /* XXX */
1.35 mycroft 1048: in_pcbstate(inp, INP_BOUND); /* XXX */
1.1 cgd 1049: break;
1050:
1051: case PRU_SHUTDOWN:
1052: socantsendmore(so);
1053: break;
1054:
1.31 mycroft 1055: case PRU_RCVD:
1056: error = EOPNOTSUPP;
1.1 cgd 1057: break;
1058:
1.31 mycroft 1059: case PRU_SEND:
1.32 mycroft 1060: if (control && control->m_len) {
1061: m_freem(control);
1062: m_freem(m);
1063: error = EINVAL;
1064: break;
1065: }
1.31 mycroft 1066: {
1.35 mycroft 1067: struct in_addr laddr; /* XXX */
1.1 cgd 1068:
1.31 mycroft 1069: if (nam) {
1.35 mycroft 1070: laddr = inp->inp_laddr; /* XXX */
1.31 mycroft 1071: if ((so->so_state & SS_ISCONNECTED) != 0) {
1072: error = EISCONN;
1.32 mycroft 1073: goto die;
1.31 mycroft 1074: }
1075: error = in_pcbconnect(inp, nam);
1.32 mycroft 1076: if (error) {
1077: die:
1078: m_freem(m);
1.31 mycroft 1079: break;
1.32 mycroft 1080: }
1.31 mycroft 1081: } else {
1082: if ((so->so_state & SS_ISCONNECTED) == 0) {
1083: error = ENOTCONN;
1.32 mycroft 1084: goto die;
1.31 mycroft 1085: }
1086: }
1.33 mycroft 1087: error = udp_output(m, inp);
1.31 mycroft 1088: if (nam) {
1089: in_pcbdisconnect(inp);
1.35 mycroft 1090: inp->inp_laddr = laddr; /* XXX */
1091: in_pcbstate(inp, INP_BOUND); /* XXX */
1.31 mycroft 1092: }
1093: }
1.1 cgd 1094: break;
1095:
1096: case PRU_SENSE:
1097: /*
1098: * stat: don't bother with a blocksize.
1099: */
1.31 mycroft 1100: splx(s);
1.1 cgd 1101: return (0);
1102:
1.31 mycroft 1103: case PRU_RCVOOB:
1104: error = EOPNOTSUPP;
1105: break;
1106:
1.1 cgd 1107: case PRU_SENDOOB:
1.32 mycroft 1108: m_freem(control);
1.31 mycroft 1109: m_freem(m);
1.1 cgd 1110: error = EOPNOTSUPP;
1111: break;
1112:
1.31 mycroft 1113: case PRU_SOCKADDR:
1114: in_setsockaddr(inp, nam);
1115: break;
1116:
1117: case PRU_PEERADDR:
1118: in_setpeeraddr(inp, nam);
1119: break;
1.1 cgd 1120:
1121: default:
1122: panic("udp_usrreq");
1123: }
1124:
1125: release:
1.31 mycroft 1126: splx(s);
1.1 cgd 1127: return (error);
1.13 mycroft 1128: }
1129:
1130: /*
1131: * Sysctl for udp variables.
1132: */
1.27 christos 1133: int
1.13 mycroft 1134: udp_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
1135: int *name;
1136: u_int namelen;
1137: void *oldp;
1138: size_t *oldlenp;
1139: void *newp;
1140: size_t newlen;
1141: {
1142: /* All sysctl names at this level are terminal. */
1143: if (namelen != 1)
1144: return (ENOTDIR);
1145:
1146: switch (name[0]) {
1147: case UDPCTL_CHECKSUM:
1148: return (sysctl_int(oldp, oldlenp, newp, newlen, &udpcksum));
1.42 thorpej 1149: case UDPCTL_SENDSPACE:
1150: return (sysctl_int(oldp, oldlenp, newp, newlen,
1151: &udp_sendspace));
1152: case UDPCTL_RECVSPACE:
1.94 itojun 1153: return (sysctl_int(oldp, oldlenp, newp, newlen,
1.42 thorpej 1154: &udp_recvspace));
1.13 mycroft 1155: default:
1156: return (ENOPROTOOPT);
1157: }
1158: /* NOTREACHED */
1.1 cgd 1159: }
1.72 itojun 1160: #endif
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