Annotation of src/sys/netinet/udp_usrreq.c, Revision 1.86
1.86 ! itojun 1: /* $NetBSD: udp_usrreq.c,v 1.85 2001/10/15 09:51:15 itojun Exp $ */
1.48 itojun 2:
3: /*
4: * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
5: * All rights reserved.
6: *
7: * Redistribution and use in source and binary forms, with or without
8: * modification, are permitted provided that the following conditions
9: * are met:
10: * 1. Redistributions of source code must retain the above copyright
11: * notice, this list of conditions and the following disclaimer.
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in the
14: * documentation and/or other materials provided with the distribution.
15: * 3. Neither the name of the project nor the names of its contributors
16: * may be used to endorse or promote products derived from this software
17: * without specific prior written permission.
18: *
19: * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
20: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22: * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
23: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29: * SUCH DAMAGE.
30: */
1.14 cgd 31:
1.1 cgd 32: /*
1.44 thorpej 33: * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995
1.13 mycroft 34: * The Regents of the University of California. All rights reserved.
1.1 cgd 35: *
36: * Redistribution and use in source and binary forms, with or without
37: * modification, are permitted provided that the following conditions
38: * are met:
39: * 1. Redistributions of source code must retain the above copyright
40: * notice, this list of conditions and the following disclaimer.
41: * 2. Redistributions in binary form must reproduce the above copyright
42: * notice, this list of conditions and the following disclaimer in the
43: * documentation and/or other materials provided with the distribution.
44: * 3. All advertising materials mentioning features or use of this software
45: * must display the following acknowledgement:
46: * This product includes software developed by the University of
47: * California, Berkeley and its contributors.
48: * 4. Neither the name of the University nor the names of its contributors
49: * may be used to endorse or promote products derived from this software
50: * without specific prior written permission.
51: *
52: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
53: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
54: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
55: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
56: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
57: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
58: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
59: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
60: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
61: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
62: * SUCH DAMAGE.
63: *
1.44 thorpej 64: * @(#)udp_usrreq.c 8.6 (Berkeley) 5/23/95
1.1 cgd 65: */
1.50 thorpej 66:
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:
1.67 mrg 84: #include <uvm/uvm_extern.h>
1.27 christos 85: #include <sys/sysctl.h>
1.1 cgd 86:
1.5 mycroft 87: #include <net/if.h>
88: #include <net/route.h>
1.1 cgd 89:
1.5 mycroft 90: #include <netinet/in.h>
91: #include <netinet/in_systm.h>
1.15 cgd 92: #include <netinet/in_var.h>
1.5 mycroft 93: #include <netinet/ip.h>
94: #include <netinet/in_pcb.h>
95: #include <netinet/ip_var.h>
96: #include <netinet/ip_icmp.h>
97: #include <netinet/udp.h>
98: #include <netinet/udp_var.h>
1.1 cgd 99:
1.53 itojun 100: #ifdef INET6
101: #include <netinet/ip6.h>
102: #include <netinet/icmp6.h>
103: #include <netinet6/ip6_var.h>
104: #include <netinet6/in6_pcb.h>
105: #include <netinet6/udp6_var.h>
106: #endif
107:
108: #ifdef PULLDOWN_TEST
109: #ifndef INET6
110: /* always need ip6.h for IP6_EXTHDR_GET */
111: #include <netinet/ip6.h>
112: #endif
113: #endif
114:
1.76 itojun 115: #include "faith.h"
116: #if defined(NFAITH) && NFAITH > 0
117: #include <net/if_faith.h>
118: #endif
119:
1.27 christos 120: #include <machine/stdarg.h>
121:
1.48 itojun 122: #ifdef IPSEC
123: #include <netinet6/ipsec.h>
124: #include <netkey/key.h>
125: #endif /*IPSEC*/
126:
1.64 ws 127: #ifdef IPKDB
128: #include <ipkdb/ipkdb.h>
129: #endif
130:
1.8 mycroft 131: /*
132: * UDP protocol implementation.
133: * Per RFC 768, August, 1980.
134: */
135: #ifndef COMPAT_42
136: int udpcksum = 1;
137: #else
138: int udpcksum = 0; /* XXX */
139: #endif
140:
1.72 itojun 141: #ifdef INET
1.53 itojun 142: static void udp4_sendup __P((struct mbuf *, int, struct sockaddr *,
143: struct socket *));
144: static int udp4_realinput __P((struct sockaddr_in *, struct sockaddr_in *,
145: struct mbuf *, int));
1.72 itojun 146: #endif
1.53 itojun 147: #ifdef INET6
148: static void udp6_sendup __P((struct mbuf *, int, struct sockaddr *,
149: struct socket *));
150: static int in6_mcmatch __P((struct in6pcb *, struct in6_addr *,
151: struct ifnet *));
152: static int udp6_realinput __P((int, struct sockaddr_in6 *,
153: struct sockaddr_in6 *, struct mbuf *, int));
154: #endif
1.72 itojun 155: #ifdef INET
1.13 mycroft 156: static void udp_notify __P((struct inpcb *, int));
1.72 itojun 157: #endif
1.7 mycroft 158:
1.26 mycroft 159: #ifndef UDBHASHSIZE
160: #define UDBHASHSIZE 128
161: #endif
162: int udbhashsize = UDBHASHSIZE;
163:
1.78 thorpej 164: #ifdef UDP_CSUM_COUNTERS
165: #include <sys/device.h>
166:
167: struct evcnt udp_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
168: NULL, "udp", "hwcsum bad");
169: struct evcnt udp_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
170: NULL, "udp", "hwcsum ok");
171: struct evcnt udp_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
172: NULL, "udp", "hwcsum data");
173: struct evcnt udp_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
174: NULL, "udp", "swcsum");
175:
176: #define UDP_CSUM_COUNTER_INCR(ev) (ev)->ev_count++
177:
178: #else
179:
180: #define UDP_CSUM_COUNTER_INCR(ev) /* nothing */
181:
182: #endif /* UDP_CSUM_COUNTERS */
183:
1.7 mycroft 184: void
1.1 cgd 185: udp_init()
186: {
1.18 mycroft 187:
1.72 itojun 188: #ifdef INET
1.35 mycroft 189: in_pcbinit(&udbtable, udbhashsize, udbhashsize);
1.72 itojun 190: #endif
1.78 thorpej 191:
192: #ifdef UDP_CSUM_COUNTERS
193: evcnt_attach_static(&udp_hwcsum_bad);
194: evcnt_attach_static(&udp_hwcsum_ok);
195: evcnt_attach_static(&udp_hwcsum_data);
196: evcnt_attach_static(&udp_swcsum);
197: #endif /* UDP_CSUM_COUNTERS */
1.1 cgd 198: }
199:
1.72 itojun 200: #ifdef INET
1.7 mycroft 201: void
1.27 christos 202: #if __STDC__
203: udp_input(struct mbuf *m, ...)
204: #else
205: udp_input(m, va_alist)
206: struct mbuf *m;
207: va_dcl
208: #endif
1.1 cgd 209: {
1.53 itojun 210: va_list ap;
211: struct sockaddr_in src, dst;
212: struct ip *ip;
213: struct udphdr *uh;
214: int iphlen, proto;
215: int len;
216: int n;
217:
218: va_start(ap, m);
219: iphlen = va_arg(ap, int);
220: proto = va_arg(ap, int);
221: va_end(ap);
222:
223: udpstat.udps_ipackets++;
224:
225: #ifndef PULLDOWN_TEST
226: /*
227: * Strip IP options, if any; should skip this,
228: * make available to user, and use on returned packets,
229: * but we don't yet have a way to check the checksum
230: * with options still present.
231: */
232: if (iphlen > sizeof (struct ip)) {
233: ip_stripoptions(m, (struct mbuf *)0);
234: iphlen = sizeof(struct ip);
235: }
236: #else
237: /*
238: * we may enable the above code if we save and pass IPv4 options
239: * to the userland.
240: */
241: #endif
242:
243: /*
244: * Get IP and UDP header together in first mbuf.
245: */
246: ip = mtod(m, struct ip *);
247: #ifndef PULLDOWN_TEST
248: if (m->m_len < iphlen + sizeof(struct udphdr)) {
249: if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == 0) {
250: udpstat.udps_hdrops++;
251: return;
252: }
253: ip = mtod(m, struct ip *);
254: }
255: uh = (struct udphdr *)((caddr_t)ip + iphlen);
256: #else
257: IP6_EXTHDR_GET(uh, struct udphdr *, m, iphlen, sizeof(struct udphdr));
258: if (uh == NULL) {
259: udpstat.udps_hdrops++;
260: return;
261: }
262: #endif
263:
1.57 itojun 264: /* destination port of 0 is illegal, based on RFC768. */
265: if (uh->uh_dport == 0)
266: goto bad;
267:
1.53 itojun 268: /*
269: * Make mbuf data length reflect UDP length.
270: * If not enough data to reflect UDP length, drop.
271: */
272: len = ntohs((u_int16_t)uh->uh_ulen);
273: if (ip->ip_len != iphlen + len) {
1.70 sommerfe 274: if (ip->ip_len < iphlen + len || len < sizeof(struct udphdr)) {
1.53 itojun 275: udpstat.udps_badlen++;
276: goto bad;
277: }
278: m_adj(m, iphlen + len - ip->ip_len);
279: }
280:
281: /*
282: * Checksum extended UDP header and data.
283: */
284: if (uh->uh_sum) {
1.78 thorpej 285: switch (m->m_pkthdr.csum_flags &
1.84 thorpej 286: ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv4) |
1.78 thorpej 287: M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) {
288: case M_CSUM_UDPv4|M_CSUM_TCP_UDP_BAD:
289: UDP_CSUM_COUNTER_INCR(&udp_hwcsum_bad);
290: goto badcsum;
291:
292: case M_CSUM_UDPv4|M_CSUM_DATA:
293: UDP_CSUM_COUNTER_INCR(&udp_hwcsum_data);
294: if ((m->m_pkthdr.csum_data ^ 0xffff) != 0)
295: goto badcsum;
296: break;
297:
298: case M_CSUM_UDPv4:
299: /* Checksum was okay. */
300: UDP_CSUM_COUNTER_INCR(&udp_hwcsum_ok);
301: break;
302:
303: default:
304: /* Need to compute it ourselves. */
305: UDP_CSUM_COUNTER_INCR(&udp_swcsum);
306: if (in4_cksum(m, IPPROTO_UDP, iphlen, len) != 0)
307: goto badcsum;
308: break;
1.53 itojun 309: }
310: }
311:
312: /* construct source and dst sockaddrs. */
313: bzero(&src, sizeof(src));
314: src.sin_family = AF_INET;
315: src.sin_len = sizeof(struct sockaddr_in);
316: bcopy(&ip->ip_src, &src.sin_addr, sizeof(src.sin_addr));
317: src.sin_port = uh->uh_sport;
318: bzero(&dst, sizeof(dst));
319: dst.sin_family = AF_INET;
320: dst.sin_len = sizeof(struct sockaddr_in);
321: bcopy(&ip->ip_dst, &dst.sin_addr, sizeof(dst.sin_addr));
322: dst.sin_port = uh->uh_dport;
323:
324: n = udp4_realinput(&src, &dst, m, iphlen);
325: #ifdef INET6
326: if (IN_MULTICAST(ip->ip_dst.s_addr) || n == 0) {
327: struct sockaddr_in6 src6, dst6;
328:
329: bzero(&src6, sizeof(src6));
330: src6.sin6_family = AF_INET6;
331: src6.sin6_len = sizeof(struct sockaddr_in6);
332: src6.sin6_addr.s6_addr[10] = src6.sin6_addr.s6_addr[11] = 0xff;
333: bcopy(&ip->ip_src, &src6.sin6_addr.s6_addr[12],
334: sizeof(ip->ip_src));
335: src6.sin6_port = uh->uh_sport;
336: bzero(&dst6, sizeof(dst6));
337: dst6.sin6_family = AF_INET6;
338: dst6.sin6_len = sizeof(struct sockaddr_in6);
339: dst6.sin6_addr.s6_addr[10] = dst6.sin6_addr.s6_addr[11] = 0xff;
340: bcopy(&ip->ip_dst, &dst6.sin6_addr.s6_addr[12],
341: sizeof(ip->ip_dst));
342: dst6.sin6_port = uh->uh_dport;
343:
344: n += udp6_realinput(AF_INET, &src6, &dst6, m, iphlen);
345: }
346: #endif
347:
348: if (n == 0) {
349: if (m->m_flags & (M_BCAST | M_MCAST)) {
350: udpstat.udps_noportbcast++;
351: goto bad;
352: }
1.61 itojun 353: udpstat.udps_noport++;
1.64 ws 354: #ifdef IPKDB
1.53 itojun 355: if (checkipkdb(&ip->ip_src, uh->uh_sport, uh->uh_dport,
356: m, iphlen + sizeof(struct udphdr),
357: m->m_pkthdr.len - iphlen - sizeof(struct udphdr))) {
358: /*
359: * It was a debugger connect packet,
360: * just drop it now
361: */
362: goto bad;
363: }
364: #endif
365: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
366: m = NULL;
367: }
368:
369: bad:
370: if (m)
371: m_freem(m);
1.78 thorpej 372: return;
373:
374: badcsum:
375: m_freem(m);
376: udpstat.udps_badsum++;
1.53 itojun 377: }
1.72 itojun 378: #endif
1.53 itojun 379:
380: #ifdef INET6
381: int
382: udp6_input(mp, offp, proto)
383: struct mbuf **mp;
384: int *offp, proto;
385: {
386: struct mbuf *m = *mp;
387: int off = *offp;
388: struct sockaddr_in6 src, dst;
389: struct ip6_hdr *ip6;
390: struct udphdr *uh;
391: u_int32_t plen, ulen;
392:
1.76 itojun 393: #ifndef PULLDOWN_TEST
394: IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE);
395: #endif
396: ip6 = mtod(m, struct ip6_hdr *);
397:
1.53 itojun 398: #if defined(NFAITH) && 0 < NFAITH
1.76 itojun 399: if (faithprefix(&ip6->ip6_dst)) {
400: /* send icmp6 host unreach? */
401: m_freem(m);
402: return IPPROTO_DONE;
1.53 itojun 403: }
404: #endif
405:
406: udp6stat.udp6s_ipackets++;
407:
408: /* check for jumbogram is done in ip6_input. we can trust pkthdr.len */
409: plen = m->m_pkthdr.len - off;
410: #ifndef PULLDOWN_TEST
411: uh = (struct udphdr *)((caddr_t)ip6 + off);
412: #else
413: IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(struct udphdr));
414: if (uh == NULL) {
415: ip6stat.ip6s_tooshort++;
416: return IPPROTO_DONE;
417: }
418: #endif
419: ulen = ntohs((u_short)uh->uh_ulen);
1.69 itojun 420: /*
421: * RFC2675 section 4: jumbograms will have 0 in the UDP header field,
422: * iff payload length > 0xffff.
423: */
1.53 itojun 424: if (ulen == 0 && plen > 0xffff)
425: ulen = plen;
426:
427: if (plen != ulen) {
428: udp6stat.udp6s_badlen++;
1.54 itojun 429: goto bad;
430: }
431:
1.57 itojun 432: /* destination port of 0 is illegal, based on RFC768. */
433: if (uh->uh_dport == 0)
434: goto bad;
435:
1.54 itojun 436: /* Be proactive about malicious use of IPv4 mapped address */
437: if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
438: IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
439: /* XXX stat */
1.53 itojun 440: goto bad;
441: }
442:
443: /*
444: * Checksum extended UDP header and data.
445: */
446: if (uh->uh_sum == 0)
447: udp6stat.udp6s_nosum++;
448: else if (in6_cksum(m, IPPROTO_UDP, off, ulen) != 0) {
449: udp6stat.udp6s_badsum++;
450: goto bad;
451: }
452:
453: /*
454: * Construct source and dst sockaddrs.
455: * Note that ifindex (s6_addr16[1]) is already filled.
456: */
457: bzero(&src, sizeof(src));
458: src.sin6_family = AF_INET6;
459: src.sin6_len = sizeof(struct sockaddr_in6);
1.69 itojun 460: /* KAME hack: recover scopeid */
461: (void)in6_recoverscope(&src, &ip6->ip6_src, m->m_pkthdr.rcvif);
1.53 itojun 462: src.sin6_port = uh->uh_sport;
463: bzero(&dst, sizeof(dst));
464: dst.sin6_family = AF_INET6;
465: dst.sin6_len = sizeof(struct sockaddr_in6);
1.69 itojun 466: /* KAME hack: recover scopeid */
467: (void)in6_recoverscope(&dst, &ip6->ip6_dst, m->m_pkthdr.rcvif);
1.53 itojun 468: dst.sin6_port = uh->uh_dport;
469:
470: if (udp6_realinput(AF_INET6, &src, &dst, m, off) == 0) {
471: if (m->m_flags & M_MCAST) {
472: udp6stat.udp6s_noportmcast++;
473: goto bad;
474: }
1.61 itojun 475: udp6stat.udp6s_noport++;
1.53 itojun 476: icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
477: m = NULL;
478: }
479:
480: bad:
481: if (m)
482: m_freem(m);
483: return IPPROTO_DONE;
484: }
485: #endif
486:
1.72 itojun 487: #ifdef INET
1.53 itojun 488: static void
489: udp4_sendup(m, off, src, so)
490: struct mbuf *m;
491: int off; /* offset of data portion */
492: struct sockaddr *src;
493: struct socket *so;
494: {
495: struct mbuf *opts = NULL;
496: struct mbuf *n;
497: struct inpcb *inp = NULL;
498: #ifdef INET6
499: struct in6pcb *in6p = NULL;
500: #endif
501:
502: if (!so)
503: return;
504: switch (so->so_proto->pr_domain->dom_family) {
505: case AF_INET:
506: inp = sotoinpcb(so);
507: break;
508: #ifdef INET6
509: case AF_INET6:
510: in6p = sotoin6pcb(so);
511: break;
512: #endif
513: default:
514: return;
515: }
516:
517: #ifdef IPSEC
518: /* check AH/ESP integrity. */
519: if (so != NULL && ipsec4_in_reject_so(m, so)) {
520: ipsecstat.in_polvio++;
521: return;
522: }
523: #endif /*IPSEC*/
524:
525: if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
526: if (inp && (inp->inp_flags & INP_CONTROLOPTS
527: || so->so_options & SO_TIMESTAMP)) {
528: struct ip *ip = mtod(n, struct ip *);
529: ip_savecontrol(inp, &opts, ip, n);
530: }
531:
532: m_adj(n, off);
533: if (sbappendaddr(&so->so_rcv, src, n,
534: opts) == 0) {
535: m_freem(n);
536: if (opts)
537: m_freem(opts);
1.81 enami 538: udpstat.udps_fullsock++;
1.53 itojun 539: } else
540: sorwakeup(so);
541: }
542: }
1.72 itojun 543: #endif
1.53 itojun 544:
545: #ifdef INET6
546: static void
547: udp6_sendup(m, off, src, so)
548: struct mbuf *m;
549: int off; /* offset of data portion */
550: struct sockaddr *src;
551: struct socket *so;
552: {
553: struct mbuf *opts = NULL;
554: struct mbuf *n;
555: struct in6pcb *in6p = NULL;
556:
557: if (!so)
558: return;
559: if (so->so_proto->pr_domain->dom_family != AF_INET6)
560: return;
561: in6p = sotoin6pcb(so);
562:
563: #ifdef IPSEC
564: /* check AH/ESP integrity. */
565: if (so != NULL && ipsec6_in_reject_so(m, so)) {
566: ipsec6stat.in_polvio++;
567: return;
568: }
569: #endif /*IPSEC*/
570:
571: if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
572: if (in6p && (in6p->in6p_flags & IN6P_CONTROLOPTS
573: || in6p->in6p_socket->so_options & SO_TIMESTAMP)) {
574: struct ip6_hdr *ip6 = mtod(n, struct ip6_hdr *);
575: ip6_savecontrol(in6p, &opts, ip6, n);
576: }
577:
578: m_adj(n, off);
579: if (sbappendaddr(&so->so_rcv, src, n, opts) == 0) {
580: m_freem(n);
581: if (opts)
582: m_freem(opts);
583: udp6stat.udp6s_fullsock++;
584: } else
585: sorwakeup(so);
586: }
587: }
588: #endif
589:
1.72 itojun 590: #ifdef INET
1.53 itojun 591: static int
592: udp4_realinput(src, dst, m, off)
593: struct sockaddr_in *src;
594: struct sockaddr_in *dst;
595: struct mbuf *m;
596: int off; /* offset of udphdr */
597: {
598: u_int16_t *sport, *dport;
599: int rcvcnt;
600: struct in_addr *src4, *dst4;
601: struct inpcb *inp;
602:
603: rcvcnt = 0;
604: off += sizeof(struct udphdr); /* now, offset of payload */
605:
606: if (src->sin_family != AF_INET || dst->sin_family != AF_INET)
607: goto bad;
608:
609: src4 = &src->sin_addr;
610: sport = &src->sin_port;
611: dst4 = &dst->sin_addr;
612: dport = &dst->sin_port;
613:
1.73 itojun 614: if (IN_MULTICAST(dst4->s_addr) ||
1.53 itojun 615: in_broadcast(*dst4, m->m_pkthdr.rcvif)) {
616: struct inpcb *last;
617: /*
618: * Deliver a multicast or broadcast datagram to *all* sockets
619: * for which the local and remote addresses and ports match
620: * those of the incoming datagram. This allows more than
621: * one process to receive multi/broadcasts on the same port.
622: * (This really ought to be done for unicast datagrams as
623: * well, but that would cause problems with existing
624: * applications that open both address-specific sockets and
625: * a wildcard socket listening to the same port -- they would
626: * end up receiving duplicates of every unicast datagram.
627: * Those applications open the multiple sockets to overcome an
628: * inadequacy of the UDP socket interface, but for backwards
629: * compatibility we avoid the problem here rather than
630: * fixing the interface. Maybe 4.5BSD will remedy this?)
631: */
632:
633: /*
634: * KAME note: usually we drop udpiphdr from mbuf here.
1.71 itojun 635: * we need udpiphdr for IPsec processing so we do that later.
1.53 itojun 636: */
637: /*
638: * Locate pcb(s) for datagram.
639: */
640: for (inp = udbtable.inpt_queue.cqh_first;
641: inp != (struct inpcb *)&udbtable.inpt_queue;
642: inp = inp->inp_queue.cqe_next) {
643: if (inp->inp_lport != *dport)
644: continue;
645: if (!in_nullhost(inp->inp_laddr)) {
646: if (!in_hosteq(inp->inp_laddr, *dst4))
647: continue;
648: }
649: if (!in_nullhost(inp->inp_faddr)) {
650: if (!in_hosteq(inp->inp_faddr, *src4) ||
651: inp->inp_fport != *sport)
652: continue;
653: }
654:
655: last = inp;
656: udp4_sendup(m, off, (struct sockaddr *)src,
657: inp->inp_socket);
658: rcvcnt++;
659:
660: /*
661: * Don't look for additional matches if this one does
662: * not have either the SO_REUSEPORT or SO_REUSEADDR
663: * socket options set. This heuristic avoids searching
664: * through all pcbs in the common case of a non-shared
665: * port. It assumes that an application will never
666: * clear these options after setting them.
667: */
668: if ((inp->inp_socket->so_options &
669: (SO_REUSEPORT|SO_REUSEADDR)) == 0)
670: break;
671: }
672: } else {
673: /*
674: * Locate pcb for datagram.
675: */
676: inp = in_pcblookup_connect(&udbtable, *src4, *sport, *dst4, *dport);
677: if (inp == 0) {
678: ++udpstat.udps_pcbhashmiss;
679: inp = in_pcblookup_bind(&udbtable, *dst4, *dport);
1.82 itojun 680: if (inp == 0)
1.53 itojun 681: return rcvcnt;
682: }
683:
684: udp4_sendup(m, off, (struct sockaddr *)src, inp->inp_socket);
685: rcvcnt++;
686: }
687:
688: bad:
689: return rcvcnt;
690: }
1.72 itojun 691: #endif
1.53 itojun 692:
693: #ifdef INET6
694: static int
695: in6_mcmatch(in6p, ia6, ifp)
696: struct in6pcb *in6p;
1.66 augustss 697: struct in6_addr *ia6;
1.53 itojun 698: struct ifnet *ifp;
699: {
700: struct ip6_moptions *im6o = in6p->in6p_moptions;
701: struct in6_multi_mship *imm;
702:
703: if (im6o == NULL)
704: return 0;
705:
706: for (imm = im6o->im6o_memberships.lh_first; imm != NULL;
707: imm = imm->i6mm_chain.le_next) {
708: if ((ifp == NULL ||
709: imm->i6mm_maddr->in6m_ifp == ifp) &&
710: IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr,
711: ia6))
712: return 1;
713: }
714: return 0;
715: }
716:
717: static int
718: udp6_realinput(af, src, dst, m, off)
719: int af; /* af on packet */
720: struct sockaddr_in6 *src;
721: struct sockaddr_in6 *dst;
722: struct mbuf *m;
723: int off; /* offset of udphdr */
724: {
1.79 itojun 725: u_int16_t sport, dport;
1.53 itojun 726: int rcvcnt;
1.79 itojun 727: struct in6_addr src6, dst6;
728: const struct in_addr *dst4;
1.53 itojun 729: struct in6pcb *in6p;
730:
731: rcvcnt = 0;
732: off += sizeof(struct udphdr); /* now, offset of payload */
733:
734: if (af != AF_INET && af != AF_INET6)
735: goto bad;
736: if (src->sin6_family != AF_INET6 || dst->sin6_family != AF_INET6)
737: goto bad;
738:
1.79 itojun 739: in6_embedscope(&src6, src, NULL, NULL);
740: sport = src->sin6_port;
741: in6_embedscope(&dst6, dst, NULL, NULL);
742: dport = dst->sin6_port;
1.74 itojun 743: dst4 = (struct in_addr *)&dst->sin6_addr.s6_addr32[12];
1.53 itojun 744:
1.79 itojun 745: if (IN6_IS_ADDR_MULTICAST(&dst6) ||
746: (af == AF_INET && IN_MULTICAST(dst4->s_addr))) {
1.53 itojun 747: struct in6pcb *last;
748: /*
749: * Deliver a multicast or broadcast datagram to *all* sockets
750: * for which the local and remote addresses and ports match
751: * those of the incoming datagram. This allows more than
752: * one process to receive multi/broadcasts on the same port.
753: * (This really ought to be done for unicast datagrams as
754: * well, but that would cause problems with existing
755: * applications that open both address-specific sockets and
756: * a wildcard socket listening to the same port -- they would
757: * end up receiving duplicates of every unicast datagram.
758: * Those applications open the multiple sockets to overcome an
759: * inadequacy of the UDP socket interface, but for backwards
760: * compatibility we avoid the problem here rather than
761: * fixing the interface. Maybe 4.5BSD will remedy this?)
762: */
763:
764: /*
765: * KAME note: usually we drop udpiphdr from mbuf here.
1.71 itojun 766: * we need udpiphdr for IPsec processing so we do that later.
1.53 itojun 767: */
768: /*
769: * Locate pcb(s) for datagram.
770: */
771: for (in6p = udb6.in6p_next; in6p != &udb6;
772: in6p = in6p->in6p_next) {
1.79 itojun 773: if (in6p->in6p_lport != dport)
1.53 itojun 774: continue;
775: if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
1.79 itojun 776: if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &dst6) &&
777: !in6_mcmatch(in6p, &dst6, m->m_pkthdr.rcvif))
1.53 itojun 778: continue;
779: }
1.55 itojun 780: else {
1.79 itojun 781: if (IN6_IS_ADDR_V4MAPPED(&dst6) &&
1.85 itojun 782: (in6p->in6p_flags & IN6P_IPV6_V6ONLY))
1.55 itojun 783: continue;
784: }
1.53 itojun 785: if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
1.79 itojun 786: if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr,
787: &src6) || in6p->in6p_fport != sport)
1.53 itojun 788: continue;
789: }
1.55 itojun 790: else {
1.79 itojun 791: if (IN6_IS_ADDR_V4MAPPED(&src6) &&
1.85 itojun 792: (in6p->in6p_flags & IN6P_IPV6_V6ONLY))
1.55 itojun 793: continue;
794: }
1.53 itojun 795:
796: last = in6p;
797: udp6_sendup(m, off, (struct sockaddr *)src,
798: in6p->in6p_socket);
799: rcvcnt++;
800:
801: /*
802: * Don't look for additional matches if this one does
803: * not have either the SO_REUSEPORT or SO_REUSEADDR
804: * socket options set. This heuristic avoids searching
805: * through all pcbs in the common case of a non-shared
806: * port. It assumes that an application will never
807: * clear these options after setting them.
808: */
809: if ((in6p->in6p_socket->so_options &
810: (SO_REUSEPORT|SO_REUSEADDR)) == 0)
811: break;
812: }
813: } else {
814: /*
815: * Locate pcb for datagram.
816: */
1.79 itojun 817: in6p = in6_pcblookup_connect(&udb6, &src6, sport,
818: &dst6, dport, 0);
1.53 itojun 819: if (in6p == 0) {
820: ++udpstat.udps_pcbhashmiss;
1.79 itojun 821: in6p = in6_pcblookup_bind(&udb6, &dst6, dport, 0);
1.82 itojun 822: if (in6p == 0)
1.53 itojun 823: return rcvcnt;
824: }
825:
826: udp6_sendup(m, off, (struct sockaddr *)src, in6p->in6p_socket);
827: rcvcnt++;
828: }
829:
830: bad:
831: return rcvcnt;
832: }
833: #endif
1.1 cgd 834:
1.72 itojun 835: #ifdef INET
1.1 cgd 836: /*
837: * Notify a udp user of an asynchronous error;
838: * just wake up so that he can collect error status.
839: */
1.7 mycroft 840: static void
1.1 cgd 841: udp_notify(inp, errno)
1.66 augustss 842: struct inpcb *inp;
1.7 mycroft 843: int errno;
1.1 cgd 844: {
1.34 mycroft 845:
1.1 cgd 846: inp->inp_socket->so_error = errno;
847: sorwakeup(inp->inp_socket);
848: sowwakeup(inp->inp_socket);
849: }
850:
1.27 christos 851: void *
852: udp_ctlinput(cmd, sa, v)
1.1 cgd 853: int cmd;
854: struct sockaddr *sa;
1.27 christos 855: void *v;
1.1 cgd 856: {
1.66 augustss 857: struct ip *ip = v;
858: struct udphdr *uh;
1.18 mycroft 859: void (*notify) __P((struct inpcb *, int)) = udp_notify;
1.21 mycroft 860: int errno;
1.1 cgd 861:
1.53 itojun 862: if (sa->sa_family != AF_INET
863: || sa->sa_len != sizeof(struct sockaddr_in))
1.51 itojun 864: return NULL;
1.20 mycroft 865: if ((unsigned)cmd >= PRC_NCMDS)
1.27 christos 866: return NULL;
1.20 mycroft 867: errno = inetctlerrmap[cmd];
1.18 mycroft 868: if (PRC_IS_REDIRECT(cmd))
1.19 mycroft 869: notify = in_rtchange, ip = 0;
1.18 mycroft 870: else if (cmd == PRC_HOSTDEAD)
1.19 mycroft 871: ip = 0;
1.23 cgd 872: else if (errno == 0)
1.27 christos 873: return NULL;
1.19 mycroft 874: if (ip) {
1.1 cgd 875: uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
1.34 mycroft 876: in_pcbnotify(&udbtable, satosin(sa)->sin_addr, uh->uh_dport,
877: ip->ip_src, uh->uh_sport, errno, notify);
1.53 itojun 878:
879: /* XXX mapped address case */
1.19 mycroft 880: } else
1.34 mycroft 881: in_pcbnotifyall(&udbtable, satosin(sa)->sin_addr, errno,
882: notify);
1.27 christos 883: return NULL;
1.1 cgd 884: }
885:
1.7 mycroft 886: int
1.27 christos 887: #if __STDC__
888: udp_output(struct mbuf *m, ...)
889: #else
890: udp_output(m, va_alist)
891: struct mbuf *m;
892: va_dcl
893: #endif
894: {
1.66 augustss 895: struct inpcb *inp;
896: struct udpiphdr *ui;
897: int len = m->m_pkthdr.len;
1.31 mycroft 898: int error = 0;
1.27 christos 899: va_list ap;
900:
901: va_start(ap, m);
902: inp = va_arg(ap, struct inpcb *);
903: va_end(ap);
1.1 cgd 904:
905: /*
906: * Calculate data length and get a mbuf
907: * for UDP and IP headers.
908: */
1.13 mycroft 909: M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT);
910: if (m == 0) {
911: error = ENOBUFS;
1.39 thorpej 912: goto release;
913: }
914:
915: /*
916: * Compute the packet length of the IP header, and
917: * punt if the length looks bogus.
918: */
919: if ((len + sizeof(struct udpiphdr)) > IP_MAXPACKET) {
920: error = EMSGSIZE;
1.13 mycroft 921: goto release;
922: }
1.1 cgd 923:
924: /*
925: * Fill in mbuf with extended UDP header
926: * and addresses and length put into network format.
927: */
928: ui = mtod(m, struct udpiphdr *);
929: ui->ui_pr = IPPROTO_UDP;
930: ui->ui_src = inp->inp_laddr;
931: ui->ui_dst = inp->inp_faddr;
932: ui->ui_sport = inp->inp_lport;
933: ui->ui_dport = inp->inp_fport;
1.78 thorpej 934: ui->ui_ulen = htons((u_int16_t)len + sizeof(struct udphdr));
1.1 cgd 935:
936: /*
1.78 thorpej 937: * Set up checksum and output datagram.
1.1 cgd 938: */
939: if (udpcksum) {
1.78 thorpej 940: /*
941: * XXX Cache pseudo-header checksum part for
942: * XXX "connected" UDP sockets.
943: */
944: ui->ui_sum = in_cksum_phdr(ui->ui_src.s_addr,
945: ui->ui_dst.s_addr, htons((u_int16_t)len +
946: sizeof(struct udphdr) + IPPROTO_UDP));
947: m->m_pkthdr.csum_flags = M_CSUM_UDPv4;
948: m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
949: } else
950: ui->ui_sum = 0;
1.1 cgd 951: ((struct ip *)ui)->ip_len = sizeof (struct udpiphdr) + len;
952: ((struct ip *)ui)->ip_ttl = inp->inp_ip.ip_ttl; /* XXX */
953: ((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; /* XXX */
954: udpstat.udps_opackets++;
1.48 itojun 955:
956: #ifdef IPSEC
1.75 itojun 957: if (ipsec_setsocket(m, inp->inp_socket) != 0) {
958: error = ENOBUFS;
959: goto release;
960: }
1.48 itojun 961: #endif /*IPSEC*/
962:
1.31 mycroft 963: return (ip_output(m, inp->inp_options, &inp->inp_route,
1.12 mycroft 964: inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST),
1.31 mycroft 965: inp->inp_moptions));
1.1 cgd 966:
967: release:
968: m_freem(m);
969: return (error);
970: }
971:
1.42 thorpej 972: int udp_sendspace = 9216; /* really max datagram size */
973: int udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in));
1.1 cgd 974: /* 40 1K datagrams */
975:
976: /*ARGSUSED*/
1.7 mycroft 977: int
1.31 mycroft 978: udp_usrreq(so, req, m, nam, control, p)
1.1 cgd 979: struct socket *so;
980: int req;
1.31 mycroft 981: struct mbuf *m, *nam, *control;
1.30 mycroft 982: struct proc *p;
1.1 cgd 983: {
1.66 augustss 984: struct inpcb *inp;
1.1 cgd 985: int s;
1.66 augustss 986: int error = 0;
1.1 cgd 987:
988: if (req == PRU_CONTROL)
1.31 mycroft 989: return (in_control(so, (long)m, (caddr_t)nam,
1.30 mycroft 990: (struct ifnet *)control, p));
1.59 thorpej 991:
1.60 thorpej 992: if (req == PRU_PURGEIF) {
1.80 itojun 993: in_pcbpurgeif0(&udbtable, (struct ifnet *)control);
1.60 thorpej 994: in_purgeif((struct ifnet *)control);
995: in_pcbpurgeif(&udbtable, (struct ifnet *)control);
1.59 thorpej 996: return (0);
997: }
1.31 mycroft 998:
999: s = splsoftnet();
1000: inp = sotoinpcb(so);
1.32 mycroft 1001: #ifdef DIAGNOSTIC
1002: if (req != PRU_SEND && req != PRU_SENDOOB && control)
1003: panic("udp_usrreq: unexpected control mbuf");
1004: #endif
1.31 mycroft 1005: if (inp == 0 && req != PRU_ATTACH) {
1006: error = EINVAL;
1007: goto release;
1008: }
1009:
1.1 cgd 1010: /*
1011: * Note: need to block udp_input while changing
1012: * the udp pcb queue and/or pcb addresses.
1013: */
1014: switch (req) {
1015:
1016: case PRU_ATTACH:
1.31 mycroft 1017: if (inp != 0) {
1018: error = EISCONN;
1.1 cgd 1019: break;
1020: }
1.31 mycroft 1021: if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
1022: error = soreserve(so, udp_sendspace, udp_recvspace);
1023: if (error)
1024: break;
1025: }
1.18 mycroft 1026: error = in_pcballoc(so, &udbtable);
1.1 cgd 1027: if (error)
1028: break;
1.31 mycroft 1029: inp = sotoinpcb(so);
1030: inp->inp_ip.ip_ttl = ip_defttl;
1.1 cgd 1031: break;
1032:
1033: case PRU_DETACH:
1.31 mycroft 1034: in_pcbdetach(inp);
1.1 cgd 1035: break;
1036:
1037: case PRU_BIND:
1.31 mycroft 1038: error = in_pcbbind(inp, nam, p);
1.1 cgd 1039: break;
1040:
1041: case PRU_LISTEN:
1042: error = EOPNOTSUPP;
1043: break;
1044:
1045: case PRU_CONNECT:
1.31 mycroft 1046: error = in_pcbconnect(inp, nam);
1047: if (error)
1.1 cgd 1048: break;
1.31 mycroft 1049: soisconnected(so);
1.1 cgd 1050: break;
1051:
1052: case PRU_CONNECT2:
1053: error = EOPNOTSUPP;
1054: break;
1055:
1056: case PRU_DISCONNECT:
1.31 mycroft 1057: /*soisdisconnected(so);*/
1058: so->so_state &= ~SS_ISCONNECTED; /* XXX */
1.1 cgd 1059: in_pcbdisconnect(inp);
1.34 mycroft 1060: inp->inp_laddr = zeroin_addr; /* XXX */
1.35 mycroft 1061: in_pcbstate(inp, INP_BOUND); /* XXX */
1.1 cgd 1062: break;
1063:
1064: case PRU_SHUTDOWN:
1065: socantsendmore(so);
1066: break;
1067:
1.31 mycroft 1068: case PRU_RCVD:
1069: error = EOPNOTSUPP;
1.1 cgd 1070: break;
1071:
1.31 mycroft 1072: case PRU_SEND:
1.32 mycroft 1073: if (control && control->m_len) {
1074: m_freem(control);
1075: m_freem(m);
1076: error = EINVAL;
1077: break;
1078: }
1.31 mycroft 1079: {
1.35 mycroft 1080: struct in_addr laddr; /* XXX */
1.1 cgd 1081:
1.31 mycroft 1082: if (nam) {
1.35 mycroft 1083: laddr = inp->inp_laddr; /* XXX */
1.31 mycroft 1084: if ((so->so_state & SS_ISCONNECTED) != 0) {
1085: error = EISCONN;
1.32 mycroft 1086: goto die;
1.31 mycroft 1087: }
1088: error = in_pcbconnect(inp, nam);
1.32 mycroft 1089: if (error) {
1090: die:
1091: m_freem(m);
1.31 mycroft 1092: break;
1.32 mycroft 1093: }
1.31 mycroft 1094: } else {
1095: if ((so->so_state & SS_ISCONNECTED) == 0) {
1096: error = ENOTCONN;
1.32 mycroft 1097: goto die;
1.31 mycroft 1098: }
1099: }
1.33 mycroft 1100: error = udp_output(m, inp);
1.31 mycroft 1101: if (nam) {
1102: in_pcbdisconnect(inp);
1.35 mycroft 1103: inp->inp_laddr = laddr; /* XXX */
1104: in_pcbstate(inp, INP_BOUND); /* XXX */
1.31 mycroft 1105: }
1106: }
1.1 cgd 1107: break;
1108:
1109: case PRU_SENSE:
1110: /*
1111: * stat: don't bother with a blocksize.
1112: */
1.31 mycroft 1113: splx(s);
1.1 cgd 1114: return (0);
1115:
1.31 mycroft 1116: case PRU_RCVOOB:
1117: error = EOPNOTSUPP;
1118: break;
1119:
1.1 cgd 1120: case PRU_SENDOOB:
1.32 mycroft 1121: m_freem(control);
1.31 mycroft 1122: m_freem(m);
1.1 cgd 1123: error = EOPNOTSUPP;
1124: break;
1125:
1.31 mycroft 1126: case PRU_SOCKADDR:
1127: in_setsockaddr(inp, nam);
1128: break;
1129:
1130: case PRU_PEERADDR:
1131: in_setpeeraddr(inp, nam);
1132: break;
1.1 cgd 1133:
1134: default:
1135: panic("udp_usrreq");
1136: }
1137:
1138: release:
1.31 mycroft 1139: splx(s);
1.1 cgd 1140: return (error);
1.13 mycroft 1141: }
1142:
1143: /*
1144: * Sysctl for udp variables.
1145: */
1.27 christos 1146: int
1.13 mycroft 1147: udp_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
1148: int *name;
1149: u_int namelen;
1150: void *oldp;
1151: size_t *oldlenp;
1152: void *newp;
1153: size_t newlen;
1154: {
1155: /* All sysctl names at this level are terminal. */
1156: if (namelen != 1)
1157: return (ENOTDIR);
1158:
1159: switch (name[0]) {
1160: case UDPCTL_CHECKSUM:
1161: return (sysctl_int(oldp, oldlenp, newp, newlen, &udpcksum));
1.42 thorpej 1162: case UDPCTL_SENDSPACE:
1163: return (sysctl_int(oldp, oldlenp, newp, newlen,
1164: &udp_sendspace));
1165: case UDPCTL_RECVSPACE:
1166: return (sysctl_int(oldp, oldlenp, newp, newlen,
1167: &udp_recvspace));
1.13 mycroft 1168: default:
1169: return (ENOPROTOOPT);
1170: }
1171: /* NOTREACHED */
1.1 cgd 1172: }
1.72 itojun 1173: #endif
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