Annotation of src/sys/netinet/udp_usrreq.c, Revision 1.156.4.2
1.156.4.2! rmind 1: /* $NetBSD: udp_usrreq.c,v 1.156.4.1 2007/02/27 16:54:57 yamt 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.
1.104 agc 44: * 3. Neither the name of the University nor the names of its contributors
1.1 cgd 45: * may be used to endorse or promote products derived from this software
46: * without specific prior written permission.
47: *
48: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
49: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
50: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
51: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
52: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
53: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
54: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
55: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
56: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
57: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
58: * SUCH DAMAGE.
59: *
1.44 thorpej 60: * @(#)udp_usrreq.c 8.6 (Berkeley) 5/23/95
1.1 cgd 61: */
1.91 lukem 62:
63: #include <sys/cdefs.h>
1.156.4.2! rmind 64: __KERNEL_RCSID(0, "$NetBSD: udp_usrreq.c,v 1.156.4.1 2007/02/27 16:54:57 yamt Exp $");
1.50 thorpej 65:
1.77 soda 66: #include "opt_inet.h"
1.50 thorpej 67: #include "opt_ipsec.h"
1.78 thorpej 68: #include "opt_inet_csum.h"
1.64 ws 69: #include "opt_ipkdb.h"
1.101 martin 70: #include "opt_mbuftrace.h"
1.1 cgd 71:
1.5 mycroft 72: #include <sys/param.h>
73: #include <sys/malloc.h>
74: #include <sys/mbuf.h>
75: #include <sys/protosw.h>
76: #include <sys/socket.h>
77: #include <sys/socketvar.h>
1.13 mycroft 78: #include <sys/errno.h>
1.5 mycroft 79: #include <sys/stat.h>
1.27 christos 80: #include <sys/systm.h>
81: #include <sys/proc.h>
1.53 itojun 82: #include <sys/domain.h>
1.27 christos 83: #include <sys/sysctl.h>
1.1 cgd 84:
1.5 mycroft 85: #include <net/if.h>
86: #include <net/route.h>
1.1 cgd 87:
1.5 mycroft 88: #include <netinet/in.h>
89: #include <netinet/in_systm.h>
1.15 cgd 90: #include <netinet/in_var.h>
1.5 mycroft 91: #include <netinet/ip.h>
92: #include <netinet/in_pcb.h>
93: #include <netinet/ip_var.h>
94: #include <netinet/ip_icmp.h>
95: #include <netinet/udp.h>
96: #include <netinet/udp_var.h>
1.1 cgd 97:
1.53 itojun 98: #ifdef INET6
99: #include <netinet/ip6.h>
100: #include <netinet/icmp6.h>
101: #include <netinet6/ip6_var.h>
102: #include <netinet6/in6_pcb.h>
103: #include <netinet6/udp6_var.h>
1.146 rpaulo 104: #include <netinet6/scope6_var.h>
1.53 itojun 105: #endif
106:
107: #ifndef INET6
108: /* always need ip6.h for IP6_EXTHDR_GET */
109: #include <netinet/ip6.h>
110: #endif
111:
1.76 itojun 112: #include "faith.h"
113: #if defined(NFAITH) && NFAITH > 0
114: #include <net/if_faith.h>
115: #endif
116:
1.27 christos 117: #include <machine/stdarg.h>
118:
1.105 jonathan 119: #ifdef FAST_IPSEC
120: #include <netipsec/ipsec.h>
1.121 jonathan 121: #include <netipsec/ipsec_var.h> /* XXX ipsecstat namespace */
1.147 christos 122: #include <netipsec/esp.h>
1.105 jonathan 123: #ifdef INET6
124: #include <netipsec/ipsec6.h>
125: #endif
126: #endif /* FAST_IPSEC*/
127:
1.48 itojun 128: #ifdef IPSEC
129: #include <netinet6/ipsec.h>
1.147 christos 130: #include <netinet6/esp.h>
1.48 itojun 131: #include <netkey/key.h>
132: #endif /*IPSEC*/
133:
1.64 ws 134: #ifdef IPKDB
135: #include <ipkdb/ipkdb.h>
136: #endif
137:
1.8 mycroft 138: /*
139: * UDP protocol implementation.
140: * Per RFC 768, August, 1980.
141: */
142: int udpcksum = 1;
1.141 yamt 143: int udp_do_loopback_cksum = 0;
1.93 matt 144:
145: struct inpcbtable udbtable;
146: struct udpstat udpstat;
1.8 mycroft 147:
1.72 itojun 148: #ifdef INET
1.130 manu 149: #ifdef IPSEC_NAT_T
1.144 manu 150: static int udp4_espinudp (struct mbuf **, int, struct sockaddr *,
1.130 manu 151: struct socket *);
152: #endif
1.119 matt 153: static void udp4_sendup (struct mbuf *, int, struct sockaddr *,
154: struct socket *);
155: static int udp4_realinput (struct sockaddr_in *, struct sockaddr_in *,
1.144 manu 156: struct mbuf **, int);
1.129 yamt 157: static int udp4_input_checksum(struct mbuf *, const struct udphdr *, int, int);
1.72 itojun 158: #endif
1.53 itojun 159: #ifdef INET6
1.119 matt 160: static void udp6_sendup (struct mbuf *, int, struct sockaddr *,
161: struct socket *);
162: static int udp6_realinput (int, struct sockaddr_in6 *,
163: struct sockaddr_in6 *, struct mbuf *, int);
1.129 yamt 164: static int udp6_input_checksum(struct mbuf *, const struct udphdr *, int, int);
1.53 itojun 165: #endif
1.72 itojun 166: #ifdef INET
1.119 matt 167: static void udp_notify (struct inpcb *, int);
1.72 itojun 168: #endif
1.7 mycroft 169:
1.26 mycroft 170: #ifndef UDBHASHSIZE
171: #define UDBHASHSIZE 128
172: #endif
173: int udbhashsize = UDBHASHSIZE;
174:
1.98 matt 175: #ifdef MBUFTRACE
1.150 dogcow 176: struct mowner udp_mowner = MOWNER_INIT("udp", "");
177: struct mowner udp_rx_mowner = MOWNER_INIT("udp", "rx");
178: struct mowner udp_tx_mowner = MOWNER_INIT("udp", "tx");
1.98 matt 179: #endif
180:
1.78 thorpej 181: #ifdef UDP_CSUM_COUNTERS
182: #include <sys/device.h>
183:
1.140 yamt 184: #if defined(INET)
1.78 thorpej 185: struct evcnt udp_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
186: NULL, "udp", "hwcsum bad");
187: struct evcnt udp_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
188: NULL, "udp", "hwcsum ok");
189: struct evcnt udp_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
190: NULL, "udp", "hwcsum data");
191: struct evcnt udp_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
192: NULL, "udp", "swcsum");
193:
1.120 matt 194: EVCNT_ATTACH_STATIC(udp_hwcsum_bad);
195: EVCNT_ATTACH_STATIC(udp_hwcsum_ok);
196: EVCNT_ATTACH_STATIC(udp_hwcsum_data);
197: EVCNT_ATTACH_STATIC(udp_swcsum);
1.140 yamt 198: #endif /* defined(INET) */
199:
200: #if defined(INET6)
201: struct evcnt udp6_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
202: NULL, "udp6", "hwcsum bad");
203: struct evcnt udp6_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
204: NULL, "udp6", "hwcsum ok");
205: struct evcnt udp6_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
206: NULL, "udp6", "hwcsum data");
207: struct evcnt udp6_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
208: NULL, "udp6", "swcsum");
209:
210: EVCNT_ATTACH_STATIC(udp6_hwcsum_bad);
211: EVCNT_ATTACH_STATIC(udp6_hwcsum_ok);
212: EVCNT_ATTACH_STATIC(udp6_hwcsum_data);
213: EVCNT_ATTACH_STATIC(udp6_swcsum);
214: #endif /* defined(INET6) */
215:
216: #define UDP_CSUM_COUNTER_INCR(ev) (ev)->ev_count++
1.120 matt 217:
1.78 thorpej 218: #else
219:
220: #define UDP_CSUM_COUNTER_INCR(ev) /* nothing */
221:
222: #endif /* UDP_CSUM_COUNTERS */
223:
1.7 mycroft 224: void
1.119 matt 225: udp_init(void)
1.1 cgd 226: {
1.18 mycroft 227:
1.35 mycroft 228: in_pcbinit(&udbtable, udbhashsize, udbhashsize);
1.78 thorpej 229:
1.98 matt 230: MOWNER_ATTACH(&udp_tx_mowner);
231: MOWNER_ATTACH(&udp_rx_mowner);
232: MOWNER_ATTACH(&udp_mowner);
1.1 cgd 233: }
234:
1.129 yamt 235: /*
236: * Checksum extended UDP header and data.
237: */
238:
239: int
240: udp_input_checksum(int af, struct mbuf *m, const struct udphdr *uh,
241: int iphlen, int len)
242: {
243:
244: switch (af) {
1.72 itojun 245: #ifdef INET
1.129 yamt 246: case AF_INET:
247: return udp4_input_checksum(m, uh, iphlen, len);
248: #endif
249: #ifdef INET6
250: case AF_INET6:
251: return udp6_input_checksum(m, uh, iphlen, len);
252: #endif
253: }
254: #ifdef DIAGNOSTIC
255: panic("udp_input_checksum: unknown af %d", af);
256: #endif
257: /* NOTREACHED */
258: return -1;
259: }
260:
261: #ifdef INET
262:
263: /*
264: * Checksum extended UDP header and data.
265: */
266:
267: static int
268: udp4_input_checksum(struct mbuf *m, const struct udphdr *uh,
269: int iphlen, int len)
270: {
271:
272: /*
273: * XXX it's better to record and check if this mbuf is
274: * already checked.
275: */
276:
277: if (uh->uh_sum == 0)
278: return 0;
279:
280: switch (m->m_pkthdr.csum_flags &
281: ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv4) |
282: M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) {
283: case M_CSUM_UDPv4|M_CSUM_TCP_UDP_BAD:
284: UDP_CSUM_COUNTER_INCR(&udp_hwcsum_bad);
285: goto badcsum;
286:
287: case M_CSUM_UDPv4|M_CSUM_DATA: {
288: u_int32_t hw_csum = m->m_pkthdr.csum_data;
289:
290: UDP_CSUM_COUNTER_INCR(&udp_hwcsum_data);
291: if (m->m_pkthdr.csum_flags & M_CSUM_NO_PSEUDOHDR) {
292: const struct ip *ip =
293: mtod(m, const struct ip *);
294:
295: hw_csum = in_cksum_phdr(ip->ip_src.s_addr,
296: ip->ip_dst.s_addr,
297: htons(hw_csum + len + IPPROTO_UDP));
298: }
299: if ((hw_csum ^ 0xffff) != 0)
300: goto badcsum;
301: break;
302: }
303:
304: case M_CSUM_UDPv4:
305: /* Checksum was okay. */
306: UDP_CSUM_COUNTER_INCR(&udp_hwcsum_ok);
307: break;
308:
309: default:
310: /*
311: * Need to compute it ourselves. Maybe skip checksum
312: * on loopback interfaces.
313: */
314: if (__predict_true(!(m->m_pkthdr.rcvif->if_flags &
315: IFF_LOOPBACK) ||
316: udp_do_loopback_cksum)) {
317: UDP_CSUM_COUNTER_INCR(&udp_swcsum);
318: if (in4_cksum(m, IPPROTO_UDP, iphlen, len) != 0)
319: goto badcsum;
320: }
321: break;
322: }
323:
324: return 0;
325:
326: badcsum:
327: udpstat.udps_badsum++;
328: return -1;
329: }
330:
1.7 mycroft 331: void
1.27 christos 332: udp_input(struct mbuf *m, ...)
1.1 cgd 333: {
1.53 itojun 334: va_list ap;
335: struct sockaddr_in src, dst;
336: struct ip *ip;
337: struct udphdr *uh;
1.97 simonb 338: int iphlen;
1.53 itojun 339: int len;
340: int n;
1.96 itojun 341: u_int16_t ip_len;
1.53 itojun 342:
343: va_start(ap, m);
344: iphlen = va_arg(ap, int);
1.97 simonb 345: (void)va_arg(ap, int); /* ignore value, advance ap */
1.53 itojun 346: va_end(ap);
347:
1.98 matt 348: MCLAIM(m, &udp_rx_mowner);
1.53 itojun 349: udpstat.udps_ipackets++;
350:
351: /*
352: * Get IP and UDP header together in first mbuf.
353: */
354: ip = mtod(m, struct ip *);
355: IP6_EXTHDR_GET(uh, struct udphdr *, m, iphlen, sizeof(struct udphdr));
356: if (uh == NULL) {
357: udpstat.udps_hdrops++;
358: return;
359: }
1.95 thorpej 360: KASSERT(UDP_HDR_ALIGNED_P(uh));
1.53 itojun 361:
1.57 itojun 362: /* destination port of 0 is illegal, based on RFC768. */
363: if (uh->uh_dport == 0)
364: goto bad;
365:
1.53 itojun 366: /*
367: * Make mbuf data length reflect UDP length.
368: * If not enough data to reflect UDP length, drop.
369: */
1.96 itojun 370: ip_len = ntohs(ip->ip_len);
1.53 itojun 371: len = ntohs((u_int16_t)uh->uh_ulen);
1.96 itojun 372: if (ip_len != iphlen + len) {
373: if (ip_len < iphlen + len || len < sizeof(struct udphdr)) {
1.53 itojun 374: udpstat.udps_badlen++;
375: goto bad;
376: }
1.96 itojun 377: m_adj(m, iphlen + len - ip_len);
1.53 itojun 378: }
379:
380: /*
381: * Checksum extended UDP header and data.
382: */
1.129 yamt 383: if (udp4_input_checksum(m, uh, iphlen, len))
384: goto badcsum;
1.53 itojun 385:
386: /* construct source and dst sockaddrs. */
387: bzero(&src, sizeof(src));
388: src.sin_family = AF_INET;
389: src.sin_len = sizeof(struct sockaddr_in);
390: bcopy(&ip->ip_src, &src.sin_addr, sizeof(src.sin_addr));
391: src.sin_port = uh->uh_sport;
392: bzero(&dst, sizeof(dst));
393: dst.sin_family = AF_INET;
394: dst.sin_len = sizeof(struct sockaddr_in);
395: bcopy(&ip->ip_dst, &dst.sin_addr, sizeof(dst.sin_addr));
396: dst.sin_port = uh->uh_dport;
397:
1.144 manu 398: if ((n = udp4_realinput(&src, &dst, &m, iphlen)) == -1) {
399: udpstat.udps_hdrops++;
400: return;
401: }
1.53 itojun 402: #ifdef INET6
403: if (IN_MULTICAST(ip->ip_dst.s_addr) || n == 0) {
404: struct sockaddr_in6 src6, dst6;
405:
406: bzero(&src6, sizeof(src6));
407: src6.sin6_family = AF_INET6;
408: src6.sin6_len = sizeof(struct sockaddr_in6);
409: src6.sin6_addr.s6_addr[10] = src6.sin6_addr.s6_addr[11] = 0xff;
410: bcopy(&ip->ip_src, &src6.sin6_addr.s6_addr[12],
411: sizeof(ip->ip_src));
412: src6.sin6_port = uh->uh_sport;
413: bzero(&dst6, sizeof(dst6));
414: dst6.sin6_family = AF_INET6;
415: dst6.sin6_len = sizeof(struct sockaddr_in6);
416: dst6.sin6_addr.s6_addr[10] = dst6.sin6_addr.s6_addr[11] = 0xff;
417: bcopy(&ip->ip_dst, &dst6.sin6_addr.s6_addr[12],
418: sizeof(ip->ip_dst));
419: dst6.sin6_port = uh->uh_dport;
420:
421: n += udp6_realinput(AF_INET, &src6, &dst6, m, iphlen);
422: }
423: #endif
424:
425: if (n == 0) {
426: if (m->m_flags & (M_BCAST | M_MCAST)) {
427: udpstat.udps_noportbcast++;
428: goto bad;
429: }
1.61 itojun 430: udpstat.udps_noport++;
1.64 ws 431: #ifdef IPKDB
1.53 itojun 432: if (checkipkdb(&ip->ip_src, uh->uh_sport, uh->uh_dport,
433: m, iphlen + sizeof(struct udphdr),
434: m->m_pkthdr.len - iphlen - sizeof(struct udphdr))) {
435: /*
436: * It was a debugger connect packet,
437: * just drop it now
438: */
439: goto bad;
440: }
441: #endif
442: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
443: m = NULL;
444: }
445:
446: bad:
447: if (m)
448: m_freem(m);
1.78 thorpej 449: return;
450:
451: badcsum:
452: m_freem(m);
1.53 itojun 453: }
1.72 itojun 454: #endif
1.53 itojun 455:
456: #ifdef INET6
1.129 yamt 457: static int
458: udp6_input_checksum(struct mbuf *m, const struct udphdr *uh, int off, int len)
459: {
460:
1.140 yamt 461: /*
462: * XXX it's better to record and check if this mbuf is
463: * already checked.
464: */
465:
1.129 yamt 466: if (__predict_false((m->m_flags & M_LOOP) && !udp_do_loopback_cksum)) {
467: goto good;
468: }
469: if (uh->uh_sum == 0) {
470: udp6stat.udp6s_nosum++;
471: goto bad;
472: }
1.140 yamt 473:
474: switch (m->m_pkthdr.csum_flags &
475: ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv6) |
476: M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) {
477: case M_CSUM_UDPv6|M_CSUM_TCP_UDP_BAD:
478: UDP_CSUM_COUNTER_INCR(&udp6_hwcsum_bad);
1.129 yamt 479: udp6stat.udp6s_badsum++;
480: goto bad;
1.140 yamt 481:
482: #if 0 /* notyet */
483: case M_CSUM_UDPv6|M_CSUM_DATA:
484: #endif
485:
486: case M_CSUM_UDPv6:
487: /* Checksum was okay. */
488: UDP_CSUM_COUNTER_INCR(&udp6_hwcsum_ok);
489: break;
490:
491: default:
492: /*
493: * Need to compute it ourselves. Maybe skip checksum
494: * on loopback interfaces.
495: */
496: UDP_CSUM_COUNTER_INCR(&udp6_swcsum);
497: if (in6_cksum(m, IPPROTO_UDP, off, len) != 0) {
498: udp6stat.udp6s_badsum++;
499: goto bad;
500: }
1.129 yamt 501: }
502:
503: good:
504: return 0;
505: bad:
506: return -1;
507: }
508:
1.53 itojun 509: int
1.154 yamt 510: udp6_input(struct mbuf **mp, int *offp, int proto)
1.53 itojun 511: {
512: struct mbuf *m = *mp;
513: int off = *offp;
514: struct sockaddr_in6 src, dst;
515: struct ip6_hdr *ip6;
516: struct udphdr *uh;
517: u_int32_t plen, ulen;
518:
1.76 itojun 519: ip6 = mtod(m, struct ip6_hdr *);
520:
1.53 itojun 521: #if defined(NFAITH) && 0 < NFAITH
1.76 itojun 522: if (faithprefix(&ip6->ip6_dst)) {
523: /* send icmp6 host unreach? */
524: m_freem(m);
525: return IPPROTO_DONE;
1.53 itojun 526: }
527: #endif
528:
529: udp6stat.udp6s_ipackets++;
530:
531: /* check for jumbogram is done in ip6_input. we can trust pkthdr.len */
532: plen = m->m_pkthdr.len - off;
533: IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(struct udphdr));
534: if (uh == NULL) {
535: ip6stat.ip6s_tooshort++;
536: return IPPROTO_DONE;
537: }
1.95 thorpej 538: KASSERT(UDP_HDR_ALIGNED_P(uh));
1.53 itojun 539: ulen = ntohs((u_short)uh->uh_ulen);
1.69 itojun 540: /*
541: * RFC2675 section 4: jumbograms will have 0 in the UDP header field,
542: * iff payload length > 0xffff.
543: */
1.53 itojun 544: if (ulen == 0 && plen > 0xffff)
545: ulen = plen;
546:
547: if (plen != ulen) {
548: udp6stat.udp6s_badlen++;
1.54 itojun 549: goto bad;
550: }
551:
1.57 itojun 552: /* destination port of 0 is illegal, based on RFC768. */
553: if (uh->uh_dport == 0)
554: goto bad;
555:
1.54 itojun 556: /* Be proactive about malicious use of IPv4 mapped address */
557: if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
558: IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
559: /* XXX stat */
1.53 itojun 560: goto bad;
561: }
562:
563: /*
1.125 thorpej 564: * Checksum extended UDP header and data. Maybe skip checksum
565: * on loopback interfaces.
1.53 itojun 566: */
1.129 yamt 567: if (udp6_input_checksum(m, uh, off, ulen))
568: goto bad;
1.53 itojun 569:
570: /*
571: * Construct source and dst sockaddrs.
572: */
573: bzero(&src, sizeof(src));
574: src.sin6_family = AF_INET6;
575: src.sin6_len = sizeof(struct sockaddr_in6);
1.146 rpaulo 576: src.sin6_addr = ip6->ip6_src;
1.53 itojun 577: src.sin6_port = uh->uh_sport;
578: bzero(&dst, sizeof(dst));
579: dst.sin6_family = AF_INET6;
580: dst.sin6_len = sizeof(struct sockaddr_in6);
1.146 rpaulo 581: dst.sin6_addr = ip6->ip6_dst;
1.53 itojun 582: dst.sin6_port = uh->uh_dport;
583:
584: if (udp6_realinput(AF_INET6, &src, &dst, m, off) == 0) {
585: if (m->m_flags & M_MCAST) {
586: udp6stat.udp6s_noportmcast++;
587: goto bad;
588: }
1.61 itojun 589: udp6stat.udp6s_noport++;
1.53 itojun 590: icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
591: m = NULL;
592: }
593:
594: bad:
595: if (m)
596: m_freem(m);
597: return IPPROTO_DONE;
598: }
599: #endif
600:
1.72 itojun 601: #ifdef INET
1.53 itojun 602: static void
1.119 matt 603: udp4_sendup(struct mbuf *m, int off /* offset of data portion */,
604: struct sockaddr *src, struct socket *so)
1.53 itojun 605: {
606: struct mbuf *opts = NULL;
607: struct mbuf *n;
608: struct inpcb *inp = NULL;
609:
610: if (!so)
611: return;
612: switch (so->so_proto->pr_domain->dom_family) {
613: case AF_INET:
614: inp = sotoinpcb(so);
615: break;
616: #ifdef INET6
617: case AF_INET6:
618: break;
619: #endif
620: default:
621: return;
622: }
623:
1.105 jonathan 624: #if defined(IPSEC) || defined(FAST_IPSEC)
1.53 itojun 625: /* check AH/ESP integrity. */
626: if (so != NULL && ipsec4_in_reject_so(m, so)) {
627: ipsecstat.in_polvio++;
1.110 itojun 628: if ((n = m_copy(m, 0, M_COPYALL)) != NULL)
629: icmp_error(n, ICMP_UNREACH, ICMP_UNREACH_ADMIN_PROHIBIT,
630: 0, 0);
1.53 itojun 631: return;
632: }
633: #endif /*IPSEC*/
634:
635: if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
636: if (inp && (inp->inp_flags & INP_CONTROLOPTS
637: || so->so_options & SO_TIMESTAMP)) {
638: struct ip *ip = mtod(n, struct ip *);
639: ip_savecontrol(inp, &opts, ip, n);
640: }
641:
642: m_adj(n, off);
643: if (sbappendaddr(&so->so_rcv, src, n,
644: opts) == 0) {
645: m_freem(n);
646: if (opts)
647: m_freem(opts);
1.124 darrenr 648: so->so_rcv.sb_overflowed++;
1.81 enami 649: udpstat.udps_fullsock++;
1.53 itojun 650: } else
651: sorwakeup(so);
652: }
653: }
1.72 itojun 654: #endif
1.53 itojun 655:
656: #ifdef INET6
657: static void
1.119 matt 658: udp6_sendup(struct mbuf *m, int off /* offset of data portion */,
659: struct sockaddr *src, struct socket *so)
1.53 itojun 660: {
661: struct mbuf *opts = NULL;
662: struct mbuf *n;
663: struct in6pcb *in6p = NULL;
664:
665: if (!so)
666: return;
667: if (so->so_proto->pr_domain->dom_family != AF_INET6)
668: return;
669: in6p = sotoin6pcb(so);
670:
1.105 jonathan 671: #if defined(IPSEC) || defined(FAST_IPSEC)
1.53 itojun 672: /* check AH/ESP integrity. */
673: if (so != NULL && ipsec6_in_reject_so(m, so)) {
674: ipsec6stat.in_polvio++;
1.111 mycroft 675: if ((n = m_copy(m, 0, M_COPYALL)) != NULL)
1.110 itojun 676: icmp6_error(n, ICMP6_DST_UNREACH,
677: ICMP6_DST_UNREACH_ADMIN, 0);
1.53 itojun 678: return;
679: }
680: #endif /*IPSEC*/
681:
682: if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
683: if (in6p && (in6p->in6p_flags & IN6P_CONTROLOPTS
684: || in6p->in6p_socket->so_options & SO_TIMESTAMP)) {
685: struct ip6_hdr *ip6 = mtod(n, struct ip6_hdr *);
686: ip6_savecontrol(in6p, &opts, ip6, n);
687: }
688:
689: m_adj(n, off);
690: if (sbappendaddr(&so->so_rcv, src, n, opts) == 0) {
691: m_freem(n);
692: if (opts)
693: m_freem(opts);
1.124 darrenr 694: so->so_rcv.sb_overflowed++;
1.53 itojun 695: udp6stat.udp6s_fullsock++;
696: } else
697: sorwakeup(so);
698: }
699: }
700: #endif
701:
1.72 itojun 702: #ifdef INET
1.53 itojun 703: static int
1.119 matt 704: udp4_realinput(struct sockaddr_in *src, struct sockaddr_in *dst,
1.144 manu 705: struct mbuf **mp, int off /* offset of udphdr */)
1.53 itojun 706: {
707: u_int16_t *sport, *dport;
708: int rcvcnt;
709: struct in_addr *src4, *dst4;
1.109 itojun 710: struct inpcb_hdr *inph;
1.53 itojun 711: struct inpcb *inp;
1.144 manu 712: struct mbuf *m = *mp;
1.53 itojun 713:
714: rcvcnt = 0;
715: off += sizeof(struct udphdr); /* now, offset of payload */
716:
717: if (src->sin_family != AF_INET || dst->sin_family != AF_INET)
718: goto bad;
719:
720: src4 = &src->sin_addr;
721: sport = &src->sin_port;
722: dst4 = &dst->sin_addr;
723: dport = &dst->sin_port;
724:
1.73 itojun 725: if (IN_MULTICAST(dst4->s_addr) ||
1.53 itojun 726: in_broadcast(*dst4, m->m_pkthdr.rcvif)) {
727: /*
728: * Deliver a multicast or broadcast datagram to *all* sockets
729: * for which the local and remote addresses and ports match
730: * those of the incoming datagram. This allows more than
731: * one process to receive multi/broadcasts on the same port.
732: * (This really ought to be done for unicast datagrams as
733: * well, but that would cause problems with existing
734: * applications that open both address-specific sockets and
735: * a wildcard socket listening to the same port -- they would
736: * end up receiving duplicates of every unicast datagram.
737: * Those applications open the multiple sockets to overcome an
738: * inadequacy of the UDP socket interface, but for backwards
739: * compatibility we avoid the problem here rather than
740: * fixing the interface. Maybe 4.5BSD will remedy this?)
741: */
742:
743: /*
1.92 itojun 744: * KAME note: traditionally we dropped udpiphdr from mbuf here.
1.71 itojun 745: * we need udpiphdr for IPsec processing so we do that later.
1.53 itojun 746: */
747: /*
748: * Locate pcb(s) for datagram.
749: */
1.109 itojun 750: CIRCLEQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) {
751: inp = (struct inpcb *)inph;
752: if (inp->inp_af != AF_INET)
753: continue;
754:
1.53 itojun 755: if (inp->inp_lport != *dport)
756: continue;
757: if (!in_nullhost(inp->inp_laddr)) {
758: if (!in_hosteq(inp->inp_laddr, *dst4))
759: continue;
760: }
761: if (!in_nullhost(inp->inp_faddr)) {
762: if (!in_hosteq(inp->inp_faddr, *src4) ||
763: inp->inp_fport != *sport)
764: continue;
765: }
766:
767: udp4_sendup(m, off, (struct sockaddr *)src,
768: inp->inp_socket);
769: rcvcnt++;
770:
771: /*
772: * Don't look for additional matches if this one does
773: * not have either the SO_REUSEPORT or SO_REUSEADDR
774: * socket options set. This heuristic avoids searching
775: * through all pcbs in the common case of a non-shared
776: * port. It assumes that an application will never
777: * clear these options after setting them.
778: */
779: if ((inp->inp_socket->so_options &
780: (SO_REUSEPORT|SO_REUSEADDR)) == 0)
781: break;
782: }
783: } else {
784: /*
785: * Locate pcb for datagram.
786: */
787: inp = in_pcblookup_connect(&udbtable, *src4, *sport, *dst4, *dport);
788: if (inp == 0) {
789: ++udpstat.udps_pcbhashmiss;
790: inp = in_pcblookup_bind(&udbtable, *dst4, *dport);
1.82 itojun 791: if (inp == 0)
1.53 itojun 792: return rcvcnt;
793: }
794:
1.130 manu 795: #ifdef IPSEC_NAT_T
796: /* Handle ESP over UDP */
797: if (inp->inp_flags & INP_ESPINUDP_ALL) {
798: struct sockaddr *sa = (struct sockaddr *)src;
799:
1.144 manu 800: switch(udp4_espinudp(mp, off, sa, inp->inp_socket)) {
801: case -1: /* Error, m was freeed */
802: rcvcnt = -1;
803: goto bad;
804: break;
805:
806: case 1: /* ESP over UDP */
1.130 manu 807: rcvcnt++;
808: goto bad;
1.144 manu 809: break;
810:
811: case 0: /* plain UDP */
812: default: /* Unexpected */
813: /*
814: * Normal UDP processing will take place
815: * m may have changed.
816: */
817: m = *mp;
818: break;
1.130 manu 819: }
820: }
821: #endif
822:
1.53 itojun 823: udp4_sendup(m, off, (struct sockaddr *)src, inp->inp_socket);
824: rcvcnt++;
825: }
826:
827: bad:
828: return rcvcnt;
829: }
1.72 itojun 830: #endif
1.53 itojun 831:
832: #ifdef INET6
833: static int
1.119 matt 834: udp6_realinput(int af, struct sockaddr_in6 *src, struct sockaddr_in6 *dst,
835: struct mbuf *m, int off)
1.53 itojun 836: {
1.79 itojun 837: u_int16_t sport, dport;
1.53 itojun 838: int rcvcnt;
1.146 rpaulo 839: struct in6_addr src6, *dst6;
1.79 itojun 840: const struct in_addr *dst4;
1.109 itojun 841: struct inpcb_hdr *inph;
1.53 itojun 842: struct in6pcb *in6p;
843:
844: rcvcnt = 0;
845: off += sizeof(struct udphdr); /* now, offset of payload */
846:
847: if (af != AF_INET && af != AF_INET6)
848: goto bad;
849: if (src->sin6_family != AF_INET6 || dst->sin6_family != AF_INET6)
850: goto bad;
851:
1.146 rpaulo 852: src6 = src->sin6_addr;
853: if (sa6_recoverscope(src) != 0) {
854: /* XXX: should be impossible. */
855: goto bad;
856: }
1.79 itojun 857: sport = src->sin6_port;
1.146 rpaulo 858:
1.79 itojun 859: dport = dst->sin6_port;
1.88 itojun 860: dst4 = (struct in_addr *)&dst->sin6_addr.s6_addr[12];
1.146 rpaulo 861: dst6 = &dst->sin6_addr;
1.53 itojun 862:
1.146 rpaulo 863: if (IN6_IS_ADDR_MULTICAST(dst6) ||
1.79 itojun 864: (af == AF_INET && IN_MULTICAST(dst4->s_addr))) {
1.53 itojun 865: /*
866: * Deliver a multicast or broadcast datagram to *all* sockets
867: * for which the local and remote addresses and ports match
868: * those of the incoming datagram. This allows more than
869: * one process to receive multi/broadcasts on the same port.
870: * (This really ought to be done for unicast datagrams as
871: * well, but that would cause problems with existing
872: * applications that open both address-specific sockets and
873: * a wildcard socket listening to the same port -- they would
874: * end up receiving duplicates of every unicast datagram.
875: * Those applications open the multiple sockets to overcome an
876: * inadequacy of the UDP socket interface, but for backwards
877: * compatibility we avoid the problem here rather than
878: * fixing the interface. Maybe 4.5BSD will remedy this?)
879: */
880:
881: /*
1.92 itojun 882: * KAME note: traditionally we dropped udpiphdr from mbuf here.
1.71 itojun 883: * we need udpiphdr for IPsec processing so we do that later.
1.53 itojun 884: */
885: /*
886: * Locate pcb(s) for datagram.
887: */
1.109 itojun 888: CIRCLEQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) {
889: in6p = (struct in6pcb *)inph;
890: if (in6p->in6p_af != AF_INET6)
891: continue;
892:
1.79 itojun 893: if (in6p->in6p_lport != dport)
1.53 itojun 894: continue;
895: if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
1.146 rpaulo 896: if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr,
897: dst6))
1.53 itojun 898: continue;
1.92 itojun 899: } else {
1.146 rpaulo 900: if (IN6_IS_ADDR_V4MAPPED(dst6) &&
1.85 itojun 901: (in6p->in6p_flags & IN6P_IPV6_V6ONLY))
1.55 itojun 902: continue;
903: }
1.53 itojun 904: if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
1.79 itojun 905: if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr,
906: &src6) || in6p->in6p_fport != sport)
1.53 itojun 907: continue;
1.92 itojun 908: } else {
1.79 itojun 909: if (IN6_IS_ADDR_V4MAPPED(&src6) &&
1.85 itojun 910: (in6p->in6p_flags & IN6P_IPV6_V6ONLY))
1.55 itojun 911: continue;
912: }
1.53 itojun 913:
914: udp6_sendup(m, off, (struct sockaddr *)src,
915: in6p->in6p_socket);
916: rcvcnt++;
917:
918: /*
919: * Don't look for additional matches if this one does
920: * not have either the SO_REUSEPORT or SO_REUSEADDR
921: * socket options set. This heuristic avoids searching
922: * through all pcbs in the common case of a non-shared
923: * port. It assumes that an application will never
924: * clear these options after setting them.
925: */
926: if ((in6p->in6p_socket->so_options &
927: (SO_REUSEPORT|SO_REUSEADDR)) == 0)
928: break;
929: }
930: } else {
931: /*
932: * Locate pcb for datagram.
933: */
1.146 rpaulo 934: in6p = in6_pcblookup_connect(&udbtable, &src6, sport, dst6,
935: dport, 0);
1.53 itojun 936: if (in6p == 0) {
937: ++udpstat.udps_pcbhashmiss;
1.146 rpaulo 938: in6p = in6_pcblookup_bind(&udbtable, dst6, dport, 0);
1.82 itojun 939: if (in6p == 0)
1.53 itojun 940: return rcvcnt;
941: }
942:
943: udp6_sendup(m, off, (struct sockaddr *)src, in6p->in6p_socket);
944: rcvcnt++;
945: }
946:
947: bad:
948: return rcvcnt;
949: }
950: #endif
1.1 cgd 951:
1.72 itojun 952: #ifdef INET
1.1 cgd 953: /*
954: * Notify a udp user of an asynchronous error;
955: * just wake up so that he can collect error status.
956: */
1.7 mycroft 957: static void
1.119 matt 958: udp_notify(struct inpcb *inp, int errno)
1.1 cgd 959: {
960: inp->inp_socket->so_error = errno;
961: sorwakeup(inp->inp_socket);
962: sowwakeup(inp->inp_socket);
963: }
964:
1.27 christos 965: void *
1.156.4.1 yamt 966: udp_ctlinput(int cmd, const struct sockaddr *sa, void *v)
1.1 cgd 967: {
1.66 augustss 968: struct ip *ip = v;
969: struct udphdr *uh;
1.119 matt 970: void (*notify)(struct inpcb *, int) = udp_notify;
1.21 mycroft 971: int errno;
1.1 cgd 972:
1.53 itojun 973: if (sa->sa_family != AF_INET
974: || sa->sa_len != sizeof(struct sockaddr_in))
1.51 itojun 975: return NULL;
1.20 mycroft 976: if ((unsigned)cmd >= PRC_NCMDS)
1.27 christos 977: return NULL;
1.20 mycroft 978: errno = inetctlerrmap[cmd];
1.18 mycroft 979: if (PRC_IS_REDIRECT(cmd))
1.19 mycroft 980: notify = in_rtchange, ip = 0;
1.18 mycroft 981: else if (cmd == PRC_HOSTDEAD)
1.19 mycroft 982: ip = 0;
1.23 cgd 983: else if (errno == 0)
1.27 christos 984: return NULL;
1.19 mycroft 985: if (ip) {
1.156.4.2! rmind 986: uh = (struct udphdr *)((char *)ip + (ip->ip_hl << 2));
1.156.4.1 yamt 987: in_pcbnotify(&udbtable, satocsin(sa)->sin_addr, uh->uh_dport,
1.34 mycroft 988: ip->ip_src, uh->uh_sport, errno, notify);
1.53 itojun 989:
990: /* XXX mapped address case */
1.19 mycroft 991: } else
1.156.4.1 yamt 992: in_pcbnotifyall(&udbtable, satocsin(sa)->sin_addr, errno,
1.34 mycroft 993: notify);
1.27 christos 994: return NULL;
1.1 cgd 995: }
996:
1.7 mycroft 997: int
1.152 yamt 998: udp_ctloutput(int op, struct socket *so, int level, int optname,
999: struct mbuf **mp)
1.130 manu 1000: {
1001: int s;
1002: int error = 0;
1003: struct mbuf *m;
1004: struct inpcb *inp;
1005: int family;
1006:
1007: family = so->so_proto->pr_domain->dom_family;
1008:
1009: s = splsoftnet();
1010: switch (family) {
1011: #ifdef INET
1012: case PF_INET:
1013: if (level != IPPROTO_UDP) {
1014: error = ip_ctloutput(op, so, level, optname, mp);
1015: goto end;
1016: }
1017: break;
1018: #endif
1019: #ifdef INET6
1020: case PF_INET6:
1021: if (level != IPPROTO_UDP) {
1022: error = ip6_ctloutput(op, so, level, optname, mp);
1023: goto end;
1024: }
1025: break;
1026: #endif
1027: default:
1028: error = EAFNOSUPPORT;
1029: goto end;
1030: }
1031:
1032:
1033: switch (op) {
1034: case PRCO_SETOPT:
1035: m = *mp;
1036: inp = sotoinpcb(so);
1037:
1038: switch (optname) {
1039: case UDP_ENCAP:
1040: if (m == NULL || m->m_len < sizeof (int)) {
1041: error = EINVAL;
1.153 yamt 1042: break;
1.130 manu 1043: }
1.131 perry 1044:
1.130 manu 1045: switch(*mtod(m, int *)) {
1046: #ifdef IPSEC_NAT_T
1047: case 0:
1048: inp->inp_flags &= ~INP_ESPINUDP_ALL;
1049: break;
1050:
1051: case UDP_ENCAP_ESPINUDP:
1052: inp->inp_flags &= ~INP_ESPINUDP_ALL;
1053: inp->inp_flags |= INP_ESPINUDP;
1054: break;
1.131 perry 1055:
1.130 manu 1056: case UDP_ENCAP_ESPINUDP_NON_IKE:
1057: inp->inp_flags &= ~INP_ESPINUDP_ALL;
1058: inp->inp_flags |= INP_ESPINUDP_NON_IKE;
1059: break;
1060: #endif
1061: default:
1062: error = EINVAL;
1063: break;
1064: }
1065: break;
1066:
1067: default:
1068: error = ENOPROTOOPT;
1069: break;
1070: }
1.155 yamt 1071: if (m != NULL) {
1072: m_free(m);
1073: }
1.130 manu 1074: break;
1075:
1076: default:
1077: error = EINVAL;
1078: break;
1.131 perry 1079: }
1080:
1.130 manu 1081: end:
1082: splx(s);
1083: return error;
1084: }
1.131 perry 1085:
1.130 manu 1086:
1087: int
1.27 christos 1088: udp_output(struct mbuf *m, ...)
1089: {
1.66 augustss 1090: struct inpcb *inp;
1091: struct udpiphdr *ui;
1.125 thorpej 1092: struct route *ro;
1.66 augustss 1093: int len = m->m_pkthdr.len;
1.31 mycroft 1094: int error = 0;
1.27 christos 1095: va_list ap;
1096:
1.98 matt 1097: MCLAIM(m, &udp_tx_mowner);
1.27 christos 1098: va_start(ap, m);
1099: inp = va_arg(ap, struct inpcb *);
1100: va_end(ap);
1.1 cgd 1101:
1102: /*
1103: * Calculate data length and get a mbuf
1104: * for UDP and IP headers.
1105: */
1.13 mycroft 1106: M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT);
1107: if (m == 0) {
1108: error = ENOBUFS;
1.39 thorpej 1109: goto release;
1110: }
1111:
1112: /*
1113: * Compute the packet length of the IP header, and
1114: * punt if the length looks bogus.
1115: */
1.96 itojun 1116: if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) {
1.39 thorpej 1117: error = EMSGSIZE;
1.13 mycroft 1118: goto release;
1119: }
1.1 cgd 1120:
1121: /*
1122: * Fill in mbuf with extended UDP header
1123: * and addresses and length put into network format.
1124: */
1125: ui = mtod(m, struct udpiphdr *);
1126: ui->ui_pr = IPPROTO_UDP;
1127: ui->ui_src = inp->inp_laddr;
1128: ui->ui_dst = inp->inp_faddr;
1129: ui->ui_sport = inp->inp_lport;
1130: ui->ui_dport = inp->inp_fport;
1.78 thorpej 1131: ui->ui_ulen = htons((u_int16_t)len + sizeof(struct udphdr));
1.1 cgd 1132:
1.125 thorpej 1133: ro = &inp->inp_route;
1134:
1.1 cgd 1135: /*
1.78 thorpej 1136: * Set up checksum and output datagram.
1.1 cgd 1137: */
1138: if (udpcksum) {
1.78 thorpej 1139: /*
1140: * XXX Cache pseudo-header checksum part for
1141: * XXX "connected" UDP sockets.
1142: */
1143: ui->ui_sum = in_cksum_phdr(ui->ui_src.s_addr,
1144: ui->ui_dst.s_addr, htons((u_int16_t)len +
1145: sizeof(struct udphdr) + IPPROTO_UDP));
1.135 yamt 1146: m->m_pkthdr.csum_flags = M_CSUM_UDPv4;
1.78 thorpej 1147: m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
1148: } else
1149: ui->ui_sum = 0;
1.96 itojun 1150: ((struct ip *)ui)->ip_len = htons(sizeof (struct udpiphdr) + len);
1.1 cgd 1151: ((struct ip *)ui)->ip_ttl = inp->inp_ip.ip_ttl; /* XXX */
1152: ((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; /* XXX */
1153: udpstat.udps_opackets++;
1.48 itojun 1154:
1.125 thorpej 1155: return (ip_output(m, inp->inp_options, ro,
1.12 mycroft 1156: inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST),
1.107 itojun 1157: inp->inp_moptions, inp->inp_socket));
1.1 cgd 1158:
1159: release:
1160: m_freem(m);
1161: return (error);
1162: }
1163:
1.42 thorpej 1164: int udp_sendspace = 9216; /* really max datagram size */
1165: int udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in));
1.1 cgd 1166: /* 40 1K datagrams */
1167:
1168: /*ARGSUSED*/
1.7 mycroft 1169: int
1.119 matt 1170: udp_usrreq(struct socket *so, int req, struct mbuf *m, struct mbuf *nam,
1.145 christos 1171: struct mbuf *control, struct lwp *l)
1.1 cgd 1172: {
1.66 augustss 1173: struct inpcb *inp;
1.1 cgd 1174: int s;
1.66 augustss 1175: int error = 0;
1.1 cgd 1176:
1177: if (req == PRU_CONTROL)
1.156.4.2! rmind 1178: return (in_control(so, (long)m, (void *)nam,
1.148 ad 1179: (struct ifnet *)control, l));
1.59 thorpej 1180:
1.149 tls 1181: s = splsoftnet();
1182:
1.60 thorpej 1183: if (req == PRU_PURGEIF) {
1.80 itojun 1184: in_pcbpurgeif0(&udbtable, (struct ifnet *)control);
1.60 thorpej 1185: in_purgeif((struct ifnet *)control);
1186: in_pcbpurgeif(&udbtable, (struct ifnet *)control);
1.149 tls 1187: splx(s);
1.59 thorpej 1188: return (0);
1189: }
1.31 mycroft 1190:
1191: inp = sotoinpcb(so);
1.32 mycroft 1192: #ifdef DIAGNOSTIC
1193: if (req != PRU_SEND && req != PRU_SENDOOB && control)
1194: panic("udp_usrreq: unexpected control mbuf");
1195: #endif
1.31 mycroft 1196: if (inp == 0 && req != PRU_ATTACH) {
1197: error = EINVAL;
1198: goto release;
1199: }
1200:
1.1 cgd 1201: /*
1202: * Note: need to block udp_input while changing
1203: * the udp pcb queue and/or pcb addresses.
1204: */
1205: switch (req) {
1206:
1207: case PRU_ATTACH:
1.31 mycroft 1208: if (inp != 0) {
1209: error = EISCONN;
1.1 cgd 1210: break;
1211: }
1.98 matt 1212: #ifdef MBUFTRACE
1213: so->so_mowner = &udp_mowner;
1214: so->so_rcv.sb_mowner = &udp_rx_mowner;
1215: so->so_snd.sb_mowner = &udp_tx_mowner;
1216: #endif
1.31 mycroft 1217: if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
1218: error = soreserve(so, udp_sendspace, udp_recvspace);
1219: if (error)
1220: break;
1221: }
1.18 mycroft 1222: error = in_pcballoc(so, &udbtable);
1.1 cgd 1223: if (error)
1224: break;
1.31 mycroft 1225: inp = sotoinpcb(so);
1226: inp->inp_ip.ip_ttl = ip_defttl;
1.1 cgd 1227: break;
1228:
1229: case PRU_DETACH:
1.31 mycroft 1230: in_pcbdetach(inp);
1.1 cgd 1231: break;
1232:
1233: case PRU_BIND:
1.148 ad 1234: error = in_pcbbind(inp, nam, l);
1.1 cgd 1235: break;
1236:
1237: case PRU_LISTEN:
1238: error = EOPNOTSUPP;
1239: break;
1240:
1241: case PRU_CONNECT:
1.148 ad 1242: error = in_pcbconnect(inp, nam, l);
1.31 mycroft 1243: if (error)
1.1 cgd 1244: break;
1.31 mycroft 1245: soisconnected(so);
1.1 cgd 1246: break;
1247:
1248: case PRU_CONNECT2:
1249: error = EOPNOTSUPP;
1250: break;
1251:
1252: case PRU_DISCONNECT:
1.31 mycroft 1253: /*soisdisconnected(so);*/
1254: so->so_state &= ~SS_ISCONNECTED; /* XXX */
1.1 cgd 1255: in_pcbdisconnect(inp);
1.34 mycroft 1256: inp->inp_laddr = zeroin_addr; /* XXX */
1.35 mycroft 1257: in_pcbstate(inp, INP_BOUND); /* XXX */
1.1 cgd 1258: break;
1259:
1260: case PRU_SHUTDOWN:
1261: socantsendmore(so);
1262: break;
1263:
1.31 mycroft 1264: case PRU_RCVD:
1265: error = EOPNOTSUPP;
1.1 cgd 1266: break;
1267:
1.31 mycroft 1268: case PRU_SEND:
1.32 mycroft 1269: if (control && control->m_len) {
1270: m_freem(control);
1271: m_freem(m);
1272: error = EINVAL;
1273: break;
1274: }
1.31 mycroft 1275: {
1.35 mycroft 1276: struct in_addr laddr; /* XXX */
1.1 cgd 1277:
1.31 mycroft 1278: if (nam) {
1.35 mycroft 1279: laddr = inp->inp_laddr; /* XXX */
1.31 mycroft 1280: if ((so->so_state & SS_ISCONNECTED) != 0) {
1281: error = EISCONN;
1.32 mycroft 1282: goto die;
1.31 mycroft 1283: }
1.148 ad 1284: error = in_pcbconnect(inp, nam, l);
1.100 matt 1285: if (error)
1286: goto die;
1.31 mycroft 1287: } else {
1288: if ((so->so_state & SS_ISCONNECTED) == 0) {
1289: error = ENOTCONN;
1.32 mycroft 1290: goto die;
1.31 mycroft 1291: }
1292: }
1.33 mycroft 1293: error = udp_output(m, inp);
1.100 matt 1294: m = NULL;
1.31 mycroft 1295: if (nam) {
1296: in_pcbdisconnect(inp);
1.35 mycroft 1297: inp->inp_laddr = laddr; /* XXX */
1298: in_pcbstate(inp, INP_BOUND); /* XXX */
1.31 mycroft 1299: }
1.100 matt 1300: die:
1301: if (m)
1302: m_freem(m);
1.31 mycroft 1303: }
1.1 cgd 1304: break;
1305:
1306: case PRU_SENSE:
1307: /*
1308: * stat: don't bother with a blocksize.
1309: */
1.31 mycroft 1310: splx(s);
1.1 cgd 1311: return (0);
1312:
1.31 mycroft 1313: case PRU_RCVOOB:
1314: error = EOPNOTSUPP;
1315: break;
1316:
1.1 cgd 1317: case PRU_SENDOOB:
1.32 mycroft 1318: m_freem(control);
1.31 mycroft 1319: m_freem(m);
1.1 cgd 1320: error = EOPNOTSUPP;
1321: break;
1322:
1.31 mycroft 1323: case PRU_SOCKADDR:
1324: in_setsockaddr(inp, nam);
1325: break;
1326:
1327: case PRU_PEERADDR:
1328: in_setpeeraddr(inp, nam);
1329: break;
1.1 cgd 1330:
1331: default:
1332: panic("udp_usrreq");
1333: }
1334:
1335: release:
1.31 mycroft 1336: splx(s);
1.1 cgd 1337: return (error);
1.13 mycroft 1338: }
1339:
1340: /*
1341: * Sysctl for udp variables.
1342: */
1.114 atatat 1343: SYSCTL_SETUP(sysctl_net_inet_udp_setup, "sysctl net.inet.udp subtree setup")
1.13 mycroft 1344: {
1.114 atatat 1345:
1.116 atatat 1346: sysctl_createv(clog, 0, NULL, NULL,
1347: CTLFLAG_PERMANENT,
1.114 atatat 1348: CTLTYPE_NODE, "net", NULL,
1349: NULL, 0, NULL, 0,
1350: CTL_NET, CTL_EOL);
1.116 atatat 1351: sysctl_createv(clog, 0, NULL, NULL,
1352: CTLFLAG_PERMANENT,
1.114 atatat 1353: CTLTYPE_NODE, "inet", NULL,
1354: NULL, 0, NULL, 0,
1355: CTL_NET, PF_INET, CTL_EOL);
1.116 atatat 1356: sysctl_createv(clog, 0, NULL, NULL,
1357: CTLFLAG_PERMANENT,
1.122 atatat 1358: CTLTYPE_NODE, "udp",
1359: SYSCTL_DESCR("UDPv4 related settings"),
1.114 atatat 1360: NULL, 0, NULL, 0,
1361: CTL_NET, PF_INET, IPPROTO_UDP, CTL_EOL);
1362:
1.116 atatat 1363: sysctl_createv(clog, 0, NULL, NULL,
1364: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122 atatat 1365: CTLTYPE_INT, "checksum",
1.123 heas 1366: SYSCTL_DESCR("Compute UDP checksums"),
1.114 atatat 1367: NULL, 0, &udpcksum, 0,
1368: CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_CHECKSUM,
1369: CTL_EOL);
1.116 atatat 1370: sysctl_createv(clog, 0, NULL, NULL,
1371: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122 atatat 1372: CTLTYPE_INT, "sendspace",
1373: SYSCTL_DESCR("Default UDP send buffer size"),
1.114 atatat 1374: NULL, 0, &udp_sendspace, 0,
1375: CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_SENDSPACE,
1376: CTL_EOL);
1.116 atatat 1377: sysctl_createv(clog, 0, NULL, NULL,
1378: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122 atatat 1379: CTLTYPE_INT, "recvspace",
1380: SYSCTL_DESCR("Default UDP receive buffer size"),
1.114 atatat 1381: NULL, 0, &udp_recvspace, 0,
1382: CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_RECVSPACE,
1383: CTL_EOL);
1.125 thorpej 1384: sysctl_createv(clog, 0, NULL, NULL,
1385: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1386: CTLTYPE_INT, "do_loopback_cksum",
1387: SYSCTL_DESCR("Perform UDP checksum on loopback"),
1388: NULL, 0, &udp_do_loopback_cksum, 0,
1389: CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_LOOPBACKCKSUM,
1390: CTL_EOL);
1.132 atatat 1391: sysctl_createv(clog, 0, NULL, NULL,
1392: CTLFLAG_PERMANENT,
1.134 atatat 1393: CTLTYPE_STRUCT, "pcblist",
1.132 atatat 1394: SYSCTL_DESCR("UDP protocol control block list"),
1395: sysctl_inpcblist, 0, &udbtable, 0,
1396: CTL_NET, PF_INET, IPPROTO_UDP, CTL_CREATE,
1397: CTL_EOL);
1.139 elad 1398: sysctl_createv(clog, 0, NULL, NULL,
1399: CTLFLAG_PERMANENT,
1400: CTLTYPE_STRUCT, "stats",
1401: SYSCTL_DESCR("UDP statistics"),
1402: NULL, 0, &udpstat, sizeof(udpstat),
1403: CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_STATS,
1404: CTL_EOL);
1.1 cgd 1405: }
1.72 itojun 1406: #endif
1.130 manu 1407:
1408: #if (defined INET && defined IPSEC_NAT_T)
1409: /*
1410: * Returns:
1411: * 1 if the packet was processed
1412: * 0 if normal UDP processing should take place
1.144 manu 1413: * -1 if an error occurent and m was freed
1.130 manu 1414: */
1415: static int
1.154 yamt 1416: udp4_espinudp(struct mbuf **mp, int off, struct sockaddr *src,
1.151 christos 1417: struct socket *so)
1.130 manu 1418: {
1419: size_t len;
1.156.4.2! rmind 1420: void *data;
1.130 manu 1421: struct inpcb *inp;
1422: size_t skip = 0;
1423: size_t minlen;
1424: size_t iphdrlen;
1425: struct ip *ip;
1426: struct mbuf *n;
1.136 manu 1427: struct m_tag *tag;
1428: struct udphdr *udphdr;
1429: u_int16_t sport, dport;
1.144 manu 1430: struct mbuf *m = *mp;
1.130 manu 1431:
1.131 perry 1432: /*
1.130 manu 1433: * Collapse the mbuf chain if the first mbuf is too short
1434: * The longest case is: UDP + non ESP marker + ESP
1435: */
1436: minlen = off + sizeof(u_int64_t) + sizeof(struct esp);
1437: if (minlen > m->m_pkthdr.len)
1438: minlen = m->m_pkthdr.len;
1439:
1440: if (m->m_len < minlen) {
1.144 manu 1441: if ((*mp = m_pullup(m, minlen)) == NULL) {
1.130 manu 1442: printf("udp4_espinudp: m_pullup failed\n");
1.144 manu 1443: return -1;
1.130 manu 1444: }
1.144 manu 1445: m = *mp;
1.130 manu 1446: }
1447:
1.131 perry 1448: len = m->m_len - off;
1.156.4.2! rmind 1449: data = mtod(m, char *) + off;
1.130 manu 1450: inp = sotoinpcb(so);
1451:
1452: /* Ignore keepalive packets */
1.156.4.2! rmind 1453: if ((len == 1) && (*(unsigned char *)data == 0xff)) {
1.130 manu 1454: return 1;
1455: }
1456:
1.131 perry 1457: /*
1458: * Check that the payload is long enough to hold
1.130 manu 1459: * an ESP header and compute the length of encapsulation
1.131 perry 1460: * header to remove
1.130 manu 1461: */
1462: if (inp->inp_flags & INP_ESPINUDP) {
1463: u_int32_t *st = (u_int32_t *)data;
1464:
1465: if ((len <= sizeof(struct esp)) || (*st == 0))
1466: return 0; /* Normal UDP processing */
1467:
1468: skip = sizeof(struct udphdr);
1469: }
1470:
1471: if (inp->inp_flags & INP_ESPINUDP_NON_IKE) {
1.142 kleink 1472: u_int32_t *st = (u_int32_t *)data;
1.130 manu 1473:
1474: if ((len <= sizeof(u_int64_t) + sizeof(struct esp))
1.142 kleink 1475: || ((st[0] | st[1]) != 0))
1.130 manu 1476: return 0; /* Normal UDP processing */
1.131 perry 1477:
1.130 manu 1478: skip = sizeof(struct udphdr) + sizeof(u_int64_t);
1479: }
1480:
1481: /*
1.136 manu 1482: * Get the UDP ports. They are handled in network
1483: * order everywhere in IPSEC_NAT_T code.
1484: */
1.156.4.2! rmind 1485: udphdr = (struct udphdr *)((char *)data - skip);
1.136 manu 1486: sport = udphdr->uh_sport;
1487: dport = udphdr->uh_dport;
1488:
1489: /*
1.130 manu 1490: * Remove the UDP header (and possibly the non ESP marker)
1491: * IP header lendth is iphdrlen
1.131 perry 1492: * Before:
1.130 manu 1493: * <--- off --->
1494: * +----+------+-----+
1495: * | IP | UDP | ESP |
1496: * +----+------+-----+
1497: * <-skip->
1498: * After:
1499: * +----+-----+
1500: * | IP | ESP |
1501: * +----+-----+
1502: * <-skip->
1503: */
1504: iphdrlen = off - sizeof(struct udphdr);
1.156.4.2! rmind 1505: memmove(mtod(m, char *) + skip, mtod(m, void *), iphdrlen);
1.130 manu 1506: m_adj(m, skip);
1507:
1508: ip = mtod(m, struct ip *);
1509: ip->ip_len = htons(ntohs(ip->ip_len) - skip);
1510: ip->ip_p = IPPROTO_ESP;
1511:
1512: /*
1.131 perry 1513: * Copy the mbuf to avoid multiple free, as both
1514: * esp4_input (which we call) and udp_input (which
1.130 manu 1515: * called us) free the mbuf.
1516: */
1517: if ((n = m_dup(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
1518: printf("udp4_espinudp: m_dup failed\n");
1519: return 0;
1520: }
1521:
1.136 manu 1522: /*
1523: * Add a PACKET_TAG_IPSEC_NAT_T_PORT tag to remember
1524: * the source UDP port. This is required if we want
1525: * to select the right SPD for multiple hosts behind
1526: * same NAT
1527: */
1.137 manu 1528: if ((tag = m_tag_get(PACKET_TAG_IPSEC_NAT_T_PORTS,
1529: sizeof(sport) + sizeof(dport), M_DONTWAIT)) == NULL) {
1530: printf("udp4_espinudp: m_tag_get failed\n");
1.138 manu 1531: m_freem(n);
1.137 manu 1532: return 0;
1533: }
1.136 manu 1534: ((u_int16_t *)(tag + 1))[0] = sport;
1535: ((u_int16_t *)(tag + 1))[1] = dport;
1536: m_tag_prepend(n, tag);
1537:
1.147 christos 1538: #ifdef FAST_IPSEC
1539: ipsec4_common_input(n, iphdrlen);
1540: #else
1.130 manu 1541: esp4_input(n, iphdrlen);
1.147 christos 1542: #endif
1.130 manu 1543:
1544: /* We handled it, it shoudln't be handled by UDP */
1545: return 1;
1546: }
1547: #endif
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