Annotation of src/sys/netinet/udp_usrreq.c, Revision 1.146.2.2
1.146.2.2! rpaulo 1: /* $NetBSD: udp_usrreq.c,v 1.146.2.1 2006/02/05 03:09:11 rpaulo 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>
1.146.2.2! rpaulo 64: __KERNEL_RCSID(0, "$NetBSD: udp_usrreq.c,v 1.146.2.1 2006/02/05 03:09:11 rpaulo 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:
1.130 manu 98: #ifdef IPSEC_NAT_T
99: #include <netinet6/ipsec.h>
100: #include <netinet6/esp.h>
101: #endif
102:
1.53 itojun 103: #ifdef INET6
104: #include <netinet/ip6.h>
105: #include <netinet/icmp6.h>
106: #include <netinet6/ip6_var.h>
107: #include <netinet6/udp6_var.h>
1.146 rpaulo 108: #include <netinet6/scope6_var.h>
1.53 itojun 109: #endif
110:
111: #ifndef INET6
112: /* always need ip6.h for IP6_EXTHDR_GET */
113: #include <netinet/ip6.h>
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:
1.105 jonathan 123: #ifdef FAST_IPSEC
124: #include <netipsec/ipsec.h>
1.121 jonathan 125: #include <netipsec/ipsec_var.h> /* XXX ipsecstat namespace */
1.105 jonathan 126: #ifdef INET6
127: #include <netipsec/ipsec6.h>
128: #endif
129: #endif /* FAST_IPSEC*/
130:
1.48 itojun 131: #ifdef IPSEC
132: #include <netinet6/ipsec.h>
133: #include <netkey/key.h>
134: #endif /*IPSEC*/
135:
1.64 ws 136: #ifdef IPKDB
137: #include <ipkdb/ipkdb.h>
138: #endif
139:
1.8 mycroft 140: /*
141: * UDP protocol implementation.
142: * Per RFC 768, August, 1980.
143: */
144: #ifndef COMPAT_42
145: int udpcksum = 1;
146: #else
147: int udpcksum = 0; /* XXX */
148: #endif
1.141 yamt 149: int udp_do_loopback_cksum = 0;
1.93 matt 150:
151: struct inpcbtable udbtable;
152: struct udpstat udpstat;
1.8 mycroft 153:
1.72 itojun 154: #ifdef INET
1.130 manu 155: #ifdef IPSEC_NAT_T
1.144 manu 156: static int udp4_espinudp (struct mbuf **, int, struct sockaddr *,
1.130 manu 157: struct socket *);
158: #endif
1.119 matt 159: static void udp4_sendup (struct mbuf *, int, struct sockaddr *,
160: struct socket *);
161: static int udp4_realinput (struct sockaddr_in *, struct sockaddr_in *,
1.144 manu 162: struct mbuf **, int);
1.129 yamt 163: static int udp4_input_checksum(struct mbuf *, const struct udphdr *, int, int);
1.72 itojun 164: #endif
1.53 itojun 165: #ifdef INET6
1.119 matt 166: static void udp6_sendup (struct mbuf *, int, struct sockaddr *,
167: struct socket *);
168: static int udp6_realinput (int, struct sockaddr_in6 *,
169: struct sockaddr_in6 *, struct mbuf *, int);
1.129 yamt 170: static int udp6_input_checksum(struct mbuf *, const struct udphdr *, int, int);
1.53 itojun 171: #endif
1.72 itojun 172: #ifdef INET
1.119 matt 173: static void udp_notify (struct inpcb *, int);
1.72 itojun 174: #endif
1.7 mycroft 175:
1.26 mycroft 176: #ifndef UDBHASHSIZE
177: #define UDBHASHSIZE 128
178: #endif
179: int udbhashsize = UDBHASHSIZE;
180:
1.98 matt 181: #ifdef MBUFTRACE
182: struct mowner udp_mowner = { "udp" };
183: struct mowner udp_rx_mowner = { "udp", "rx" };
184: struct mowner udp_tx_mowner = { "udp", "tx" };
185: #endif
186:
1.78 thorpej 187: #ifdef UDP_CSUM_COUNTERS
188: #include <sys/device.h>
189:
1.140 yamt 190: #if defined(INET)
1.78 thorpej 191: struct evcnt udp_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
192: NULL, "udp", "hwcsum bad");
193: struct evcnt udp_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
194: NULL, "udp", "hwcsum ok");
195: struct evcnt udp_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
196: NULL, "udp", "hwcsum data");
197: struct evcnt udp_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
198: NULL, "udp", "swcsum");
199:
1.120 matt 200: EVCNT_ATTACH_STATIC(udp_hwcsum_bad);
201: EVCNT_ATTACH_STATIC(udp_hwcsum_ok);
202: EVCNT_ATTACH_STATIC(udp_hwcsum_data);
203: EVCNT_ATTACH_STATIC(udp_swcsum);
1.140 yamt 204: #endif /* defined(INET) */
205:
206: #if defined(INET6)
207: struct evcnt udp6_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
208: NULL, "udp6", "hwcsum bad");
209: struct evcnt udp6_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
210: NULL, "udp6", "hwcsum ok");
211: struct evcnt udp6_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
212: NULL, "udp6", "hwcsum data");
213: struct evcnt udp6_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
214: NULL, "udp6", "swcsum");
215:
216: EVCNT_ATTACH_STATIC(udp6_hwcsum_bad);
217: EVCNT_ATTACH_STATIC(udp6_hwcsum_ok);
218: EVCNT_ATTACH_STATIC(udp6_hwcsum_data);
219: EVCNT_ATTACH_STATIC(udp6_swcsum);
220: #endif /* defined(INET6) */
221:
222: #define UDP_CSUM_COUNTER_INCR(ev) (ev)->ev_count++
1.120 matt 223:
1.78 thorpej 224: #else
225:
226: #define UDP_CSUM_COUNTER_INCR(ev) /* nothing */
227:
228: #endif /* UDP_CSUM_COUNTERS */
229:
1.7 mycroft 230: void
1.119 matt 231: udp_init(void)
1.1 cgd 232: {
1.18 mycroft 233:
1.35 mycroft 234: in_pcbinit(&udbtable, udbhashsize, udbhashsize);
1.78 thorpej 235:
1.98 matt 236: MOWNER_ATTACH(&udp_tx_mowner);
237: MOWNER_ATTACH(&udp_rx_mowner);
238: MOWNER_ATTACH(&udp_mowner);
1.1 cgd 239: }
240:
1.129 yamt 241: /*
242: * Checksum extended UDP header and data.
243: */
244:
245: int
246: udp_input_checksum(int af, struct mbuf *m, const struct udphdr *uh,
247: int iphlen, int len)
248: {
249:
250: switch (af) {
1.72 itojun 251: #ifdef INET
1.129 yamt 252: case AF_INET:
253: return udp4_input_checksum(m, uh, iphlen, len);
254: #endif
255: #ifdef INET6
256: case AF_INET6:
257: return udp6_input_checksum(m, uh, iphlen, len);
258: #endif
259: }
260: #ifdef DIAGNOSTIC
261: panic("udp_input_checksum: unknown af %d", af);
262: #endif
263: /* NOTREACHED */
264: return -1;
265: }
266:
267: #ifdef INET
268:
269: /*
270: * Checksum extended UDP header and data.
271: */
272:
273: static int
274: udp4_input_checksum(struct mbuf *m, const struct udphdr *uh,
275: int iphlen, int len)
276: {
277:
278: /*
279: * XXX it's better to record and check if this mbuf is
280: * already checked.
281: */
282:
283: if (uh->uh_sum == 0)
284: return 0;
285:
286: switch (m->m_pkthdr.csum_flags &
287: ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv4) |
288: M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) {
289: case M_CSUM_UDPv4|M_CSUM_TCP_UDP_BAD:
290: UDP_CSUM_COUNTER_INCR(&udp_hwcsum_bad);
291: goto badcsum;
292:
293: case M_CSUM_UDPv4|M_CSUM_DATA: {
294: u_int32_t hw_csum = m->m_pkthdr.csum_data;
295:
296: UDP_CSUM_COUNTER_INCR(&udp_hwcsum_data);
297: if (m->m_pkthdr.csum_flags & M_CSUM_NO_PSEUDOHDR) {
298: const struct ip *ip =
299: mtod(m, const struct ip *);
300:
301: hw_csum = in_cksum_phdr(ip->ip_src.s_addr,
302: ip->ip_dst.s_addr,
303: htons(hw_csum + len + IPPROTO_UDP));
304: }
305: if ((hw_csum ^ 0xffff) != 0)
306: goto badcsum;
307: break;
308: }
309:
310: case M_CSUM_UDPv4:
311: /* Checksum was okay. */
312: UDP_CSUM_COUNTER_INCR(&udp_hwcsum_ok);
313: break;
314:
315: default:
316: /*
317: * Need to compute it ourselves. Maybe skip checksum
318: * on loopback interfaces.
319: */
320: if (__predict_true(!(m->m_pkthdr.rcvif->if_flags &
321: IFF_LOOPBACK) ||
322: udp_do_loopback_cksum)) {
323: UDP_CSUM_COUNTER_INCR(&udp_swcsum);
324: if (in4_cksum(m, IPPROTO_UDP, iphlen, len) != 0)
325: goto badcsum;
326: }
327: break;
328: }
329:
330: return 0;
331:
332: badcsum:
333: udpstat.udps_badsum++;
334: return -1;
335: }
336:
1.7 mycroft 337: void
1.27 christos 338: udp_input(struct mbuf *m, ...)
1.1 cgd 339: {
1.53 itojun 340: va_list ap;
341: struct sockaddr_in src, dst;
342: struct ip *ip;
343: struct udphdr *uh;
1.97 simonb 344: int iphlen;
1.53 itojun 345: int len;
346: int n;
1.96 itojun 347: u_int16_t ip_len;
1.53 itojun 348:
349: va_start(ap, m);
350: iphlen = va_arg(ap, int);
1.97 simonb 351: (void)va_arg(ap, int); /* ignore value, advance ap */
1.53 itojun 352: va_end(ap);
353:
1.98 matt 354: MCLAIM(m, &udp_rx_mowner);
1.53 itojun 355: udpstat.udps_ipackets++;
356:
357: /*
358: * Get IP and UDP header together in first mbuf.
359: */
360: ip = mtod(m, struct ip *);
361: IP6_EXTHDR_GET(uh, struct udphdr *, m, iphlen, sizeof(struct udphdr));
362: if (uh == NULL) {
363: udpstat.udps_hdrops++;
364: return;
365: }
1.95 thorpej 366: KASSERT(UDP_HDR_ALIGNED_P(uh));
1.53 itojun 367:
1.57 itojun 368: /* destination port of 0 is illegal, based on RFC768. */
369: if (uh->uh_dport == 0)
370: goto bad;
371:
1.53 itojun 372: /*
373: * Make mbuf data length reflect UDP length.
374: * If not enough data to reflect UDP length, drop.
375: */
1.96 itojun 376: ip_len = ntohs(ip->ip_len);
1.53 itojun 377: len = ntohs((u_int16_t)uh->uh_ulen);
1.96 itojun 378: if (ip_len != iphlen + len) {
379: if (ip_len < iphlen + len || len < sizeof(struct udphdr)) {
1.53 itojun 380: udpstat.udps_badlen++;
381: goto bad;
382: }
1.96 itojun 383: m_adj(m, iphlen + len - ip_len);
1.53 itojun 384: }
385:
386: /*
387: * Checksum extended UDP header and data.
388: */
1.129 yamt 389: if (udp4_input_checksum(m, uh, iphlen, len))
390: goto badcsum;
1.53 itojun 391:
392: /* construct source and dst sockaddrs. */
393: bzero(&src, sizeof(src));
394: src.sin_family = AF_INET;
395: src.sin_len = sizeof(struct sockaddr_in);
396: bcopy(&ip->ip_src, &src.sin_addr, sizeof(src.sin_addr));
397: src.sin_port = uh->uh_sport;
398: bzero(&dst, sizeof(dst));
399: dst.sin_family = AF_INET;
400: dst.sin_len = sizeof(struct sockaddr_in);
401: bcopy(&ip->ip_dst, &dst.sin_addr, sizeof(dst.sin_addr));
402: dst.sin_port = uh->uh_dport;
403:
1.144 manu 404: if ((n = udp4_realinput(&src, &dst, &m, iphlen)) == -1) {
405: udpstat.udps_hdrops++;
406: return;
407: }
1.53 itojun 408: #ifdef INET6
409: if (IN_MULTICAST(ip->ip_dst.s_addr) || n == 0) {
410: struct sockaddr_in6 src6, dst6;
411:
412: bzero(&src6, sizeof(src6));
413: src6.sin6_family = AF_INET6;
414: src6.sin6_len = sizeof(struct sockaddr_in6);
415: src6.sin6_addr.s6_addr[10] = src6.sin6_addr.s6_addr[11] = 0xff;
416: bcopy(&ip->ip_src, &src6.sin6_addr.s6_addr[12],
417: sizeof(ip->ip_src));
418: src6.sin6_port = uh->uh_sport;
419: bzero(&dst6, sizeof(dst6));
420: dst6.sin6_family = AF_INET6;
421: dst6.sin6_len = sizeof(struct sockaddr_in6);
422: dst6.sin6_addr.s6_addr[10] = dst6.sin6_addr.s6_addr[11] = 0xff;
423: bcopy(&ip->ip_dst, &dst6.sin6_addr.s6_addr[12],
424: sizeof(ip->ip_dst));
425: dst6.sin6_port = uh->uh_dport;
426:
427: n += udp6_realinput(AF_INET, &src6, &dst6, m, iphlen);
428: }
429: #endif
430:
431: if (n == 0) {
432: if (m->m_flags & (M_BCAST | M_MCAST)) {
433: udpstat.udps_noportbcast++;
434: goto bad;
435: }
1.61 itojun 436: udpstat.udps_noport++;
1.64 ws 437: #ifdef IPKDB
1.53 itojun 438: if (checkipkdb(&ip->ip_src, uh->uh_sport, uh->uh_dport,
439: m, iphlen + sizeof(struct udphdr),
440: m->m_pkthdr.len - iphlen - sizeof(struct udphdr))) {
441: /*
442: * It was a debugger connect packet,
443: * just drop it now
444: */
445: goto bad;
446: }
447: #endif
448: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
449: m = NULL;
450: }
451:
452: bad:
453: if (m)
454: m_freem(m);
1.78 thorpej 455: return;
456:
457: badcsum:
458: m_freem(m);
1.53 itojun 459: }
1.72 itojun 460: #endif
1.53 itojun 461:
462: #ifdef INET6
1.129 yamt 463: static int
464: udp6_input_checksum(struct mbuf *m, const struct udphdr *uh, int off, int len)
465: {
466:
1.140 yamt 467: /*
468: * XXX it's better to record and check if this mbuf is
469: * already checked.
470: */
471:
1.129 yamt 472: if (__predict_false((m->m_flags & M_LOOP) && !udp_do_loopback_cksum)) {
473: goto good;
474: }
475: if (uh->uh_sum == 0) {
476: udp6stat.udp6s_nosum++;
477: goto bad;
478: }
1.140 yamt 479:
480: switch (m->m_pkthdr.csum_flags &
481: ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv6) |
482: M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) {
483: case M_CSUM_UDPv6|M_CSUM_TCP_UDP_BAD:
484: UDP_CSUM_COUNTER_INCR(&udp6_hwcsum_bad);
1.129 yamt 485: udp6stat.udp6s_badsum++;
486: goto bad;
1.140 yamt 487:
488: #if 0 /* notyet */
489: case M_CSUM_UDPv6|M_CSUM_DATA:
490: #endif
491:
492: case M_CSUM_UDPv6:
493: /* Checksum was okay. */
494: UDP_CSUM_COUNTER_INCR(&udp6_hwcsum_ok);
495: break;
496:
497: default:
498: /*
499: * Need to compute it ourselves. Maybe skip checksum
500: * on loopback interfaces.
501: */
502: UDP_CSUM_COUNTER_INCR(&udp6_swcsum);
503: if (in6_cksum(m, IPPROTO_UDP, off, len) != 0) {
504: udp6stat.udp6s_badsum++;
505: goto bad;
506: }
1.129 yamt 507: }
508:
509: good:
510: return 0;
511: bad:
512: return -1;
513: }
514:
1.53 itojun 515: int
1.119 matt 516: udp6_input(struct mbuf **mp, int *offp, int proto)
1.53 itojun 517: {
518: struct mbuf *m = *mp;
519: int off = *offp;
520: struct sockaddr_in6 src, dst;
521: struct ip6_hdr *ip6;
522: struct udphdr *uh;
523: u_int32_t plen, ulen;
524:
1.76 itojun 525: ip6 = mtod(m, struct ip6_hdr *);
526:
1.53 itojun 527: #if defined(NFAITH) && 0 < NFAITH
1.76 itojun 528: if (faithprefix(&ip6->ip6_dst)) {
529: /* send icmp6 host unreach? */
530: m_freem(m);
531: return IPPROTO_DONE;
1.53 itojun 532: }
533: #endif
534:
535: udp6stat.udp6s_ipackets++;
536:
537: /* check for jumbogram is done in ip6_input. we can trust pkthdr.len */
538: plen = m->m_pkthdr.len - off;
539: IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(struct udphdr));
540: if (uh == NULL) {
541: ip6stat.ip6s_tooshort++;
542: return IPPROTO_DONE;
543: }
1.95 thorpej 544: KASSERT(UDP_HDR_ALIGNED_P(uh));
1.53 itojun 545: ulen = ntohs((u_short)uh->uh_ulen);
1.69 itojun 546: /*
547: * RFC2675 section 4: jumbograms will have 0 in the UDP header field,
548: * iff payload length > 0xffff.
549: */
1.53 itojun 550: if (ulen == 0 && plen > 0xffff)
551: ulen = plen;
552:
553: if (plen != ulen) {
554: udp6stat.udp6s_badlen++;
1.54 itojun 555: goto bad;
556: }
557:
1.57 itojun 558: /* destination port of 0 is illegal, based on RFC768. */
559: if (uh->uh_dport == 0)
560: goto bad;
561:
1.54 itojun 562: /* Be proactive about malicious use of IPv4 mapped address */
563: if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
564: IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
565: /* XXX stat */
1.53 itojun 566: goto bad;
567: }
568:
569: /*
1.125 thorpej 570: * Checksum extended UDP header and data. Maybe skip checksum
571: * on loopback interfaces.
1.53 itojun 572: */
1.129 yamt 573: if (udp6_input_checksum(m, uh, off, ulen))
574: goto bad;
1.53 itojun 575:
576: /*
577: * Construct source and dst sockaddrs.
578: */
579: bzero(&src, sizeof(src));
580: src.sin6_family = AF_INET6;
581: src.sin6_len = sizeof(struct sockaddr_in6);
1.146 rpaulo 582: src.sin6_addr = ip6->ip6_src;
1.53 itojun 583: src.sin6_port = uh->uh_sport;
584: bzero(&dst, sizeof(dst));
585: dst.sin6_family = AF_INET6;
586: dst.sin6_len = sizeof(struct sockaddr_in6);
1.146 rpaulo 587: dst.sin6_addr = ip6->ip6_dst;
1.53 itojun 588: dst.sin6_port = uh->uh_dport;
589:
590: if (udp6_realinput(AF_INET6, &src, &dst, m, off) == 0) {
591: if (m->m_flags & M_MCAST) {
592: udp6stat.udp6s_noportmcast++;
593: goto bad;
594: }
1.61 itojun 595: udp6stat.udp6s_noport++;
1.53 itojun 596: icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
597: m = NULL;
598: }
599:
600: bad:
601: if (m)
602: m_freem(m);
603: return IPPROTO_DONE;
604: }
605: #endif
606:
1.72 itojun 607: #ifdef INET
1.53 itojun 608: static void
1.119 matt 609: udp4_sendup(struct mbuf *m, int off /* offset of data portion */,
610: struct sockaddr *src, struct socket *so)
1.53 itojun 611: {
612: struct mbuf *opts = NULL;
613: struct mbuf *n;
614: struct inpcb *inp = NULL;
615:
616: if (!so)
617: return;
618: switch (so->so_proto->pr_domain->dom_family) {
619: case AF_INET:
620: inp = sotoinpcb(so);
621: break;
622: #ifdef INET6
623: case AF_INET6:
624: break;
625: #endif
626: default:
627: return;
628: }
629:
1.105 jonathan 630: #if defined(IPSEC) || defined(FAST_IPSEC)
1.53 itojun 631: /* check AH/ESP integrity. */
632: if (so != NULL && ipsec4_in_reject_so(m, so)) {
633: ipsecstat.in_polvio++;
1.110 itojun 634: if ((n = m_copy(m, 0, M_COPYALL)) != NULL)
635: icmp_error(n, ICMP_UNREACH, ICMP_UNREACH_ADMIN_PROHIBIT,
636: 0, 0);
1.53 itojun 637: return;
638: }
639: #endif /*IPSEC*/
640:
641: if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
642: if (inp && (inp->inp_flags & INP_CONTROLOPTS
643: || so->so_options & SO_TIMESTAMP)) {
644: struct ip *ip = mtod(n, struct ip *);
645: ip_savecontrol(inp, &opts, ip, n);
646: }
647:
648: m_adj(n, off);
649: if (sbappendaddr(&so->so_rcv, src, n,
650: opts) == 0) {
651: m_freem(n);
652: if (opts)
653: m_freem(opts);
1.124 darrenr 654: so->so_rcv.sb_overflowed++;
1.81 enami 655: udpstat.udps_fullsock++;
1.53 itojun 656: } else
657: sorwakeup(so);
658: }
659: }
1.72 itojun 660: #endif
1.53 itojun 661:
662: #ifdef INET6
663: static void
1.119 matt 664: udp6_sendup(struct mbuf *m, int off /* offset of data portion */,
665: struct sockaddr *src, struct socket *so)
1.53 itojun 666: {
667: struct mbuf *opts = NULL;
668: struct mbuf *n;
669: struct in6pcb *in6p = NULL;
670:
671: if (!so)
672: return;
673: if (so->so_proto->pr_domain->dom_family != AF_INET6)
674: return;
675: in6p = sotoin6pcb(so);
676:
1.105 jonathan 677: #if defined(IPSEC) || defined(FAST_IPSEC)
1.53 itojun 678: /* check AH/ESP integrity. */
679: if (so != NULL && ipsec6_in_reject_so(m, so)) {
680: ipsec6stat.in_polvio++;
1.111 mycroft 681: if ((n = m_copy(m, 0, M_COPYALL)) != NULL)
1.110 itojun 682: icmp6_error(n, ICMP6_DST_UNREACH,
683: ICMP6_DST_UNREACH_ADMIN, 0);
1.53 itojun 684: return;
685: }
686: #endif /*IPSEC*/
687:
688: if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
689: if (in6p && (in6p->in6p_flags & IN6P_CONTROLOPTS
690: || in6p->in6p_socket->so_options & SO_TIMESTAMP)) {
691: struct ip6_hdr *ip6 = mtod(n, struct ip6_hdr *);
692: ip6_savecontrol(in6p, &opts, ip6, n);
693: }
694:
695: m_adj(n, off);
696: if (sbappendaddr(&so->so_rcv, src, n, opts) == 0) {
697: m_freem(n);
698: if (opts)
699: m_freem(opts);
1.124 darrenr 700: so->so_rcv.sb_overflowed++;
1.53 itojun 701: udp6stat.udp6s_fullsock++;
702: } else
703: sorwakeup(so);
704: }
705: }
706: #endif
707:
1.72 itojun 708: #ifdef INET
1.53 itojun 709: static int
1.119 matt 710: udp4_realinput(struct sockaddr_in *src, struct sockaddr_in *dst,
1.144 manu 711: struct mbuf **mp, int off /* offset of udphdr */)
1.53 itojun 712: {
713: u_int16_t *sport, *dport;
714: int rcvcnt;
715: struct in_addr *src4, *dst4;
716: struct inpcb *inp;
1.144 manu 717: struct mbuf *m = *mp;
1.53 itojun 718:
719: rcvcnt = 0;
720: off += sizeof(struct udphdr); /* now, offset of payload */
721:
722: if (src->sin_family != AF_INET || dst->sin_family != AF_INET)
723: goto bad;
724:
725: src4 = &src->sin_addr;
726: sport = &src->sin_port;
727: dst4 = &dst->sin_addr;
728: dport = &dst->sin_port;
729:
1.73 itojun 730: if (IN_MULTICAST(dst4->s_addr) ||
1.53 itojun 731: in_broadcast(*dst4, m->m_pkthdr.rcvif)) {
732: /*
733: * Deliver a multicast or broadcast datagram to *all* sockets
734: * for which the local and remote addresses and ports match
735: * those of the incoming datagram. This allows more than
736: * one process to receive multi/broadcasts on the same port.
737: * (This really ought to be done for unicast datagrams as
738: * well, but that would cause problems with existing
739: * applications that open both address-specific sockets and
740: * a wildcard socket listening to the same port -- they would
741: * end up receiving duplicates of every unicast datagram.
742: * Those applications open the multiple sockets to overcome an
743: * inadequacy of the UDP socket interface, but for backwards
744: * compatibility we avoid the problem here rather than
745: * fixing the interface. Maybe 4.5BSD will remedy this?)
746: */
747:
748: /*
1.92 itojun 749: * KAME note: traditionally we dropped udpiphdr from mbuf here.
1.71 itojun 750: * we need udpiphdr for IPsec processing so we do that later.
1.53 itojun 751: */
752: /*
753: * Locate pcb(s) for datagram.
754: */
1.146.2.2! rpaulo 755: CIRCLEQ_FOREACH(inp, &udbtable.inpt_queue, inp_queue) {
1.109 itojun 756: if (inp->inp_af != AF_INET)
757: continue;
758:
1.53 itojun 759: if (inp->inp_lport != *dport)
760: continue;
761: if (!in_nullhost(inp->inp_laddr)) {
762: if (!in_hosteq(inp->inp_laddr, *dst4))
763: continue;
764: }
765: if (!in_nullhost(inp->inp_faddr)) {
766: if (!in_hosteq(inp->inp_faddr, *src4) ||
767: inp->inp_fport != *sport)
768: continue;
769: }
770:
771: udp4_sendup(m, off, (struct sockaddr *)src,
772: inp->inp_socket);
773: rcvcnt++;
774:
775: /*
776: * Don't look for additional matches if this one does
777: * not have either the SO_REUSEPORT or SO_REUSEADDR
778: * socket options set. This heuristic avoids searching
779: * through all pcbs in the common case of a non-shared
780: * port. It assumes that an application will never
781: * clear these options after setting them.
782: */
783: if ((inp->inp_socket->so_options &
784: (SO_REUSEPORT|SO_REUSEADDR)) == 0)
785: break;
786: }
787: } else {
788: /*
789: * Locate pcb for datagram.
790: */
791: inp = in_pcblookup_connect(&udbtable, *src4, *sport, *dst4, *dport);
792: if (inp == 0) {
793: ++udpstat.udps_pcbhashmiss;
794: inp = in_pcblookup_bind(&udbtable, *dst4, *dport);
1.82 itojun 795: if (inp == 0)
1.53 itojun 796: return rcvcnt;
797: }
798:
1.130 manu 799: #ifdef IPSEC_NAT_T
800: /* Handle ESP over UDP */
801: if (inp->inp_flags & INP_ESPINUDP_ALL) {
802: struct sockaddr *sa = (struct sockaddr *)src;
803:
1.144 manu 804: switch(udp4_espinudp(mp, off, sa, inp->inp_socket)) {
805: case -1: /* Error, m was freeed */
806: rcvcnt = -1;
807: goto bad;
808: break;
809:
810: case 1: /* ESP over UDP */
1.130 manu 811: rcvcnt++;
812: goto bad;
1.144 manu 813: break;
814:
815: case 0: /* plain UDP */
816: default: /* Unexpected */
817: /*
818: * Normal UDP processing will take place
819: * m may have changed.
820: */
821: m = *mp;
822: break;
1.130 manu 823: }
824: }
825: #endif
826:
1.53 itojun 827: udp4_sendup(m, off, (struct sockaddr *)src, inp->inp_socket);
828: rcvcnt++;
829: }
830:
831: bad:
832: return rcvcnt;
833: }
1.72 itojun 834: #endif
1.53 itojun 835:
836: #ifdef INET6
837: static int
1.119 matt 838: udp6_realinput(int af, struct sockaddr_in6 *src, struct sockaddr_in6 *dst,
839: struct mbuf *m, int off)
1.53 itojun 840: {
1.79 itojun 841: u_int16_t sport, dport;
1.53 itojun 842: int rcvcnt;
1.146 rpaulo 843: struct in6_addr src6, *dst6;
1.79 itojun 844: const struct in_addr *dst4;
1.146.2.2! rpaulo 845: struct inpcb *inp;
1.53 itojun 846:
847: rcvcnt = 0;
848: off += sizeof(struct udphdr); /* now, offset of payload */
849:
850: if (af != AF_INET && af != AF_INET6)
851: goto bad;
852: if (src->sin6_family != AF_INET6 || dst->sin6_family != AF_INET6)
853: goto bad;
854:
1.146 rpaulo 855: src6 = src->sin6_addr;
856: if (sa6_recoverscope(src) != 0) {
857: /* XXX: should be impossible. */
858: goto bad;
859: }
1.79 itojun 860: sport = src->sin6_port;
1.146 rpaulo 861:
1.79 itojun 862: dport = dst->sin6_port;
1.88 itojun 863: dst4 = (struct in_addr *)&dst->sin6_addr.s6_addr[12];
1.146 rpaulo 864: dst6 = &dst->sin6_addr;
1.53 itojun 865:
1.146 rpaulo 866: if (IN6_IS_ADDR_MULTICAST(dst6) ||
1.79 itojun 867: (af == AF_INET && IN_MULTICAST(dst4->s_addr))) {
1.53 itojun 868: /*
869: * Deliver a multicast or broadcast datagram to *all* sockets
870: * for which the local and remote addresses and ports match
871: * those of the incoming datagram. This allows more than
872: * one process to receive multi/broadcasts on the same port.
873: * (This really ought to be done for unicast datagrams as
874: * well, but that would cause problems with existing
875: * applications that open both address-specific sockets and
876: * a wildcard socket listening to the same port -- they would
877: * end up receiving duplicates of every unicast datagram.
878: * Those applications open the multiple sockets to overcome an
879: * inadequacy of the UDP socket interface, but for backwards
880: * compatibility we avoid the problem here rather than
881: * fixing the interface. Maybe 4.5BSD will remedy this?)
882: */
883:
884: /*
1.92 itojun 885: * KAME note: traditionally we dropped udpiphdr from mbuf here.
1.71 itojun 886: * we need udpiphdr for IPsec processing so we do that later.
1.53 itojun 887: */
888: /*
889: * Locate pcb(s) for datagram.
890: */
1.146.2.2! rpaulo 891: CIRCLEQ_FOREACH(inp, &udbtable.inpt_queue, inp_queue) {
! 892: if (inp->inp_af != AF_INET6)
1.109 itojun 893: continue;
894:
1.146.2.2! rpaulo 895: if (inp->inp_lport != dport)
1.53 itojun 896: continue;
1.146.2.2! rpaulo 897: if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
! 898: if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
1.146 rpaulo 899: dst6))
1.53 itojun 900: continue;
1.92 itojun 901: } else {
1.146 rpaulo 902: if (IN6_IS_ADDR_V4MAPPED(dst6) &&
1.146.2.2! rpaulo 903: (inp->inp_flags & IN6P_IPV6_V6ONLY))
1.55 itojun 904: continue;
905: }
1.146.2.2! rpaulo 906: if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
! 907: if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr,
! 908: &src6) || inp->inp_fport != sport)
1.53 itojun 909: continue;
1.92 itojun 910: } else {
1.79 itojun 911: if (IN6_IS_ADDR_V4MAPPED(&src6) &&
1.146.2.2! rpaulo 912: (inp->inp_flags & IN6P_IPV6_V6ONLY))
1.55 itojun 913: continue;
914: }
1.53 itojun 915:
916: udp6_sendup(m, off, (struct sockaddr *)src,
1.146.2.2! rpaulo 917: inp->inp_socket);
1.53 itojun 918: rcvcnt++;
919:
920: /*
921: * Don't look for additional matches if this one does
922: * not have either the SO_REUSEPORT or SO_REUSEADDR
923: * socket options set. This heuristic avoids searching
924: * through all pcbs in the common case of a non-shared
925: * port. It assumes that an application will never
926: * clear these options after setting them.
927: */
1.146.2.2! rpaulo 928: if ((inp->inp_socket->so_options &
1.53 itojun 929: (SO_REUSEPORT|SO_REUSEADDR)) == 0)
930: break;
931: }
932: } else {
933: /*
934: * Locate pcb for datagram.
935: */
1.146.2.2! rpaulo 936: inp = in6_pcblookup_connect(&udbtable, &src6, sport, dst6,
1.146 rpaulo 937: dport, 0);
1.146.2.2! rpaulo 938: if (inp == 0) {
1.53 itojun 939: ++udpstat.udps_pcbhashmiss;
1.146.2.2! rpaulo 940: inp = in6_pcblookup_bind(&udbtable, dst6, dport, 0);
! 941: if (inp == 0)
1.53 itojun 942: return rcvcnt;
943: }
944:
1.146.2.2! rpaulo 945: udp6_sendup(m, off, (struct sockaddr *)src, inp->inp_socket);
1.53 itojun 946: rcvcnt++;
947: }
948:
949: bad:
950: return rcvcnt;
951: }
952: #endif
1.1 cgd 953:
1.72 itojun 954: #ifdef INET
1.1 cgd 955: /*
956: * Notify a udp user of an asynchronous error;
957: * just wake up so that he can collect error status.
958: */
1.7 mycroft 959: static void
1.119 matt 960: udp_notify(struct inpcb *inp, int errno)
1.1 cgd 961: {
962: inp->inp_socket->so_error = errno;
963: sorwakeup(inp->inp_socket);
964: sowwakeup(inp->inp_socket);
965: }
966:
1.27 christos 967: void *
1.119 matt 968: udp_ctlinput(int cmd, struct sockaddr *sa, void *v)
1.1 cgd 969: {
1.66 augustss 970: struct ip *ip = v;
971: struct udphdr *uh;
1.119 matt 972: void (*notify)(struct inpcb *, int) = udp_notify;
1.21 mycroft 973: int errno;
1.1 cgd 974:
1.53 itojun 975: if (sa->sa_family != AF_INET
976: || sa->sa_len != sizeof(struct sockaddr_in))
1.51 itojun 977: return NULL;
1.20 mycroft 978: if ((unsigned)cmd >= PRC_NCMDS)
1.27 christos 979: return NULL;
1.20 mycroft 980: errno = inetctlerrmap[cmd];
1.18 mycroft 981: if (PRC_IS_REDIRECT(cmd))
1.19 mycroft 982: notify = in_rtchange, ip = 0;
1.18 mycroft 983: else if (cmd == PRC_HOSTDEAD)
1.19 mycroft 984: ip = 0;
1.23 cgd 985: else if (errno == 0)
1.27 christos 986: return NULL;
1.19 mycroft 987: if (ip) {
1.1 cgd 988: uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
1.34 mycroft 989: in_pcbnotify(&udbtable, satosin(sa)->sin_addr, uh->uh_dport,
990: ip->ip_src, uh->uh_sport, errno, notify);
1.53 itojun 991:
992: /* XXX mapped address case */
1.19 mycroft 993: } else
1.34 mycroft 994: in_pcbnotifyall(&udbtable, satosin(sa)->sin_addr, errno,
995: notify);
1.27 christos 996: return NULL;
1.1 cgd 997: }
998:
1.7 mycroft 999: int
1.131 perry 1000: udp_ctloutput(op, so, level, optname, mp)
1.130 manu 1001: int op;
1002: struct socket *so;
1003: int level, optname;
1004: struct mbuf **mp;
1005: {
1006: int s;
1007: int error = 0;
1008: struct mbuf *m;
1009: struct inpcb *inp;
1010: int family;
1011:
1012: family = so->so_proto->pr_domain->dom_family;
1013:
1014: s = splsoftnet();
1015: switch (family) {
1016: #ifdef INET
1017: case PF_INET:
1018: if (level != IPPROTO_UDP) {
1019: error = ip_ctloutput(op, so, level, optname, mp);
1020: goto end;
1021: }
1022: break;
1023: #endif
1024: #ifdef INET6
1025: case PF_INET6:
1026: if (level != IPPROTO_UDP) {
1027: error = ip6_ctloutput(op, so, level, optname, mp);
1028: goto end;
1029: }
1030: break;
1031: #endif
1032: default:
1033: error = EAFNOSUPPORT;
1034: goto end;
1035: break;
1036: }
1037:
1038:
1039: switch (op) {
1040: case PRCO_SETOPT:
1041: m = *mp;
1042: inp = sotoinpcb(so);
1043:
1044: switch (optname) {
1045: case UDP_ENCAP:
1046: if (m == NULL || m->m_len < sizeof (int)) {
1047: error = EINVAL;
1048: goto end;
1049: }
1.131 perry 1050:
1.130 manu 1051: switch(*mtod(m, int *)) {
1052: #ifdef IPSEC_NAT_T
1053: case 0:
1054: inp->inp_flags &= ~INP_ESPINUDP_ALL;
1055: break;
1056:
1057: case UDP_ENCAP_ESPINUDP:
1058: inp->inp_flags &= ~INP_ESPINUDP_ALL;
1059: inp->inp_flags |= INP_ESPINUDP;
1060: break;
1.131 perry 1061:
1.130 manu 1062: case UDP_ENCAP_ESPINUDP_NON_IKE:
1063: inp->inp_flags &= ~INP_ESPINUDP_ALL;
1064: inp->inp_flags |= INP_ESPINUDP_NON_IKE;
1065: break;
1066: #endif
1067: default:
1068: error = EINVAL;
1069: goto end;
1070: break;
1071: }
1072: break;
1073:
1074: default:
1075: error = ENOPROTOOPT;
1076: goto end;
1077: break;
1078: }
1079: break;
1080:
1081: default:
1082: error = EINVAL;
1083: goto end;
1084: break;
1.131 perry 1085: }
1086:
1.130 manu 1087: end:
1088: splx(s);
1089: return error;
1090: }
1.131 perry 1091:
1.130 manu 1092:
1093: int
1.27 christos 1094: udp_output(struct mbuf *m, ...)
1095: {
1.66 augustss 1096: struct inpcb *inp;
1097: struct udpiphdr *ui;
1.125 thorpej 1098: struct route *ro;
1.66 augustss 1099: int len = m->m_pkthdr.len;
1.31 mycroft 1100: int error = 0;
1.27 christos 1101: va_list ap;
1102:
1.98 matt 1103: MCLAIM(m, &udp_tx_mowner);
1.27 christos 1104: va_start(ap, m);
1105: inp = va_arg(ap, struct inpcb *);
1106: va_end(ap);
1.1 cgd 1107:
1108: /*
1109: * Calculate data length and get a mbuf
1110: * for UDP and IP headers.
1111: */
1.13 mycroft 1112: M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT);
1113: if (m == 0) {
1114: error = ENOBUFS;
1.39 thorpej 1115: goto release;
1116: }
1117:
1118: /*
1119: * Compute the packet length of the IP header, and
1120: * punt if the length looks bogus.
1121: */
1.96 itojun 1122: if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) {
1.39 thorpej 1123: error = EMSGSIZE;
1.13 mycroft 1124: goto release;
1125: }
1.1 cgd 1126:
1127: /*
1128: * Fill in mbuf with extended UDP header
1129: * and addresses and length put into network format.
1130: */
1131: ui = mtod(m, struct udpiphdr *);
1132: ui->ui_pr = IPPROTO_UDP;
1133: ui->ui_src = inp->inp_laddr;
1134: ui->ui_dst = inp->inp_faddr;
1135: ui->ui_sport = inp->inp_lport;
1136: ui->ui_dport = inp->inp_fport;
1.78 thorpej 1137: ui->ui_ulen = htons((u_int16_t)len + sizeof(struct udphdr));
1.1 cgd 1138:
1.125 thorpej 1139: ro = &inp->inp_route;
1140:
1.1 cgd 1141: /*
1.78 thorpej 1142: * Set up checksum and output datagram.
1.1 cgd 1143: */
1144: if (udpcksum) {
1.78 thorpej 1145: /*
1146: * XXX Cache pseudo-header checksum part for
1147: * XXX "connected" UDP sockets.
1148: */
1149: ui->ui_sum = in_cksum_phdr(ui->ui_src.s_addr,
1150: ui->ui_dst.s_addr, htons((u_int16_t)len +
1151: sizeof(struct udphdr) + IPPROTO_UDP));
1.135 yamt 1152: m->m_pkthdr.csum_flags = M_CSUM_UDPv4;
1.78 thorpej 1153: m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
1154: } else
1155: ui->ui_sum = 0;
1.96 itojun 1156: ((struct ip *)ui)->ip_len = htons(sizeof (struct udpiphdr) + len);
1.1 cgd 1157: ((struct ip *)ui)->ip_ttl = inp->inp_ip.ip_ttl; /* XXX */
1158: ((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; /* XXX */
1159: udpstat.udps_opackets++;
1.48 itojun 1160:
1.125 thorpej 1161: return (ip_output(m, inp->inp_options, ro,
1.12 mycroft 1162: inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST),
1.107 itojun 1163: inp->inp_moptions, inp->inp_socket));
1.1 cgd 1164:
1165: release:
1166: m_freem(m);
1167: return (error);
1168: }
1169:
1.42 thorpej 1170: int udp_sendspace = 9216; /* really max datagram size */
1171: int udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in));
1.1 cgd 1172: /* 40 1K datagrams */
1173:
1174: /*ARGSUSED*/
1.7 mycroft 1175: int
1.119 matt 1176: udp_usrreq(struct socket *so, int req, struct mbuf *m, struct mbuf *nam,
1.145 christos 1177: struct mbuf *control, struct lwp *l)
1.1 cgd 1178: {
1.66 augustss 1179: struct inpcb *inp;
1.145 christos 1180: struct proc *p;
1.1 cgd 1181: int s;
1.66 augustss 1182: int error = 0;
1.1 cgd 1183:
1.145 christos 1184: p = l ? l->l_proc : NULL;
1.1 cgd 1185: if (req == PRU_CONTROL)
1.31 mycroft 1186: return (in_control(so, (long)m, (caddr_t)nam,
1.30 mycroft 1187: (struct ifnet *)control, p));
1.59 thorpej 1188:
1.60 thorpej 1189: if (req == PRU_PURGEIF) {
1.80 itojun 1190: in_pcbpurgeif0(&udbtable, (struct ifnet *)control);
1.60 thorpej 1191: in_purgeif((struct ifnet *)control);
1192: in_pcbpurgeif(&udbtable, (struct ifnet *)control);
1.59 thorpej 1193: return (0);
1194: }
1.31 mycroft 1195:
1196: s = splsoftnet();
1197: inp = sotoinpcb(so);
1.32 mycroft 1198: #ifdef DIAGNOSTIC
1199: if (req != PRU_SEND && req != PRU_SENDOOB && control)
1200: panic("udp_usrreq: unexpected control mbuf");
1201: #endif
1.31 mycroft 1202: if (inp == 0 && req != PRU_ATTACH) {
1203: error = EINVAL;
1204: goto release;
1205: }
1206:
1.1 cgd 1207: /*
1208: * Note: need to block udp_input while changing
1209: * the udp pcb queue and/or pcb addresses.
1210: */
1211: switch (req) {
1212:
1213: case PRU_ATTACH:
1.31 mycroft 1214: if (inp != 0) {
1215: error = EISCONN;
1.1 cgd 1216: break;
1217: }
1.98 matt 1218: #ifdef MBUFTRACE
1219: so->so_mowner = &udp_mowner;
1220: so->so_rcv.sb_mowner = &udp_rx_mowner;
1221: so->so_snd.sb_mowner = &udp_tx_mowner;
1222: #endif
1.31 mycroft 1223: if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
1224: error = soreserve(so, udp_sendspace, udp_recvspace);
1225: if (error)
1226: break;
1227: }
1.18 mycroft 1228: error = in_pcballoc(so, &udbtable);
1.1 cgd 1229: if (error)
1230: break;
1.31 mycroft 1231: inp = sotoinpcb(so);
1232: inp->inp_ip.ip_ttl = ip_defttl;
1.1 cgd 1233: break;
1234:
1235: case PRU_DETACH:
1.31 mycroft 1236: in_pcbdetach(inp);
1.1 cgd 1237: break;
1238:
1239: case PRU_BIND:
1.31 mycroft 1240: error = in_pcbbind(inp, nam, p);
1.1 cgd 1241: break;
1242:
1243: case PRU_LISTEN:
1244: error = EOPNOTSUPP;
1245: break;
1246:
1247: case PRU_CONNECT:
1.143 dsl 1248: error = in_pcbconnect(inp, nam, p);
1.31 mycroft 1249: if (error)
1.1 cgd 1250: break;
1.31 mycroft 1251: soisconnected(so);
1.1 cgd 1252: break;
1253:
1254: case PRU_CONNECT2:
1255: error = EOPNOTSUPP;
1256: break;
1257:
1258: case PRU_DISCONNECT:
1.31 mycroft 1259: /*soisdisconnected(so);*/
1260: so->so_state &= ~SS_ISCONNECTED; /* XXX */
1.1 cgd 1261: in_pcbdisconnect(inp);
1.34 mycroft 1262: inp->inp_laddr = zeroin_addr; /* XXX */
1.35 mycroft 1263: in_pcbstate(inp, INP_BOUND); /* XXX */
1.1 cgd 1264: break;
1265:
1266: case PRU_SHUTDOWN:
1267: socantsendmore(so);
1268: break;
1269:
1.31 mycroft 1270: case PRU_RCVD:
1271: error = EOPNOTSUPP;
1.1 cgd 1272: break;
1273:
1.31 mycroft 1274: case PRU_SEND:
1.32 mycroft 1275: if (control && control->m_len) {
1276: m_freem(control);
1277: m_freem(m);
1278: error = EINVAL;
1279: break;
1280: }
1.31 mycroft 1281: {
1.35 mycroft 1282: struct in_addr laddr; /* XXX */
1.1 cgd 1283:
1.31 mycroft 1284: if (nam) {
1.35 mycroft 1285: laddr = inp->inp_laddr; /* XXX */
1.31 mycroft 1286: if ((so->so_state & SS_ISCONNECTED) != 0) {
1287: error = EISCONN;
1.32 mycroft 1288: goto die;
1.31 mycroft 1289: }
1.143 dsl 1290: error = in_pcbconnect(inp, nam, p);
1.100 matt 1291: if (error)
1292: goto die;
1.31 mycroft 1293: } else {
1294: if ((so->so_state & SS_ISCONNECTED) == 0) {
1295: error = ENOTCONN;
1.32 mycroft 1296: goto die;
1.31 mycroft 1297: }
1298: }
1.33 mycroft 1299: error = udp_output(m, inp);
1.100 matt 1300: m = NULL;
1.31 mycroft 1301: if (nam) {
1302: in_pcbdisconnect(inp);
1.35 mycroft 1303: inp->inp_laddr = laddr; /* XXX */
1304: in_pcbstate(inp, INP_BOUND); /* XXX */
1.31 mycroft 1305: }
1.100 matt 1306: die:
1307: if (m)
1308: m_freem(m);
1.31 mycroft 1309: }
1.1 cgd 1310: break;
1311:
1312: case PRU_SENSE:
1313: /*
1314: * stat: don't bother with a blocksize.
1315: */
1.31 mycroft 1316: splx(s);
1.1 cgd 1317: return (0);
1318:
1.31 mycroft 1319: case PRU_RCVOOB:
1320: error = EOPNOTSUPP;
1321: break;
1322:
1.1 cgd 1323: case PRU_SENDOOB:
1.32 mycroft 1324: m_freem(control);
1.31 mycroft 1325: m_freem(m);
1.1 cgd 1326: error = EOPNOTSUPP;
1327: break;
1328:
1.31 mycroft 1329: case PRU_SOCKADDR:
1330: in_setsockaddr(inp, nam);
1331: break;
1332:
1333: case PRU_PEERADDR:
1334: in_setpeeraddr(inp, nam);
1335: break;
1.1 cgd 1336:
1337: default:
1338: panic("udp_usrreq");
1339: }
1340:
1341: release:
1.31 mycroft 1342: splx(s);
1.1 cgd 1343: return (error);
1.13 mycroft 1344: }
1345:
1346: /*
1347: * Sysctl for udp variables.
1348: */
1.114 atatat 1349: SYSCTL_SETUP(sysctl_net_inet_udp_setup, "sysctl net.inet.udp subtree setup")
1.13 mycroft 1350: {
1.114 atatat 1351:
1.116 atatat 1352: sysctl_createv(clog, 0, NULL, NULL,
1353: CTLFLAG_PERMANENT,
1.114 atatat 1354: CTLTYPE_NODE, "net", NULL,
1355: NULL, 0, NULL, 0,
1356: CTL_NET, CTL_EOL);
1.116 atatat 1357: sysctl_createv(clog, 0, NULL, NULL,
1358: CTLFLAG_PERMANENT,
1.114 atatat 1359: CTLTYPE_NODE, "inet", NULL,
1360: NULL, 0, NULL, 0,
1361: CTL_NET, PF_INET, CTL_EOL);
1.116 atatat 1362: sysctl_createv(clog, 0, NULL, NULL,
1363: CTLFLAG_PERMANENT,
1.122 atatat 1364: CTLTYPE_NODE, "udp",
1365: SYSCTL_DESCR("UDPv4 related settings"),
1.114 atatat 1366: NULL, 0, NULL, 0,
1367: CTL_NET, PF_INET, IPPROTO_UDP, CTL_EOL);
1368:
1.116 atatat 1369: sysctl_createv(clog, 0, NULL, NULL,
1370: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122 atatat 1371: CTLTYPE_INT, "checksum",
1.123 heas 1372: SYSCTL_DESCR("Compute UDP checksums"),
1.114 atatat 1373: NULL, 0, &udpcksum, 0,
1374: CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_CHECKSUM,
1375: CTL_EOL);
1.116 atatat 1376: sysctl_createv(clog, 0, NULL, NULL,
1377: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122 atatat 1378: CTLTYPE_INT, "sendspace",
1379: SYSCTL_DESCR("Default UDP send buffer size"),
1.114 atatat 1380: NULL, 0, &udp_sendspace, 0,
1381: CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_SENDSPACE,
1382: CTL_EOL);
1.116 atatat 1383: sysctl_createv(clog, 0, NULL, NULL,
1384: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122 atatat 1385: CTLTYPE_INT, "recvspace",
1386: SYSCTL_DESCR("Default UDP receive buffer size"),
1.114 atatat 1387: NULL, 0, &udp_recvspace, 0,
1388: CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_RECVSPACE,
1389: CTL_EOL);
1.125 thorpej 1390: sysctl_createv(clog, 0, NULL, NULL,
1391: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1392: CTLTYPE_INT, "do_loopback_cksum",
1393: SYSCTL_DESCR("Perform UDP checksum on loopback"),
1394: NULL, 0, &udp_do_loopback_cksum, 0,
1395: CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_LOOPBACKCKSUM,
1396: CTL_EOL);
1.132 atatat 1397: sysctl_createv(clog, 0, NULL, NULL,
1398: CTLFLAG_PERMANENT,
1.134 atatat 1399: CTLTYPE_STRUCT, "pcblist",
1.132 atatat 1400: SYSCTL_DESCR("UDP protocol control block list"),
1401: sysctl_inpcblist, 0, &udbtable, 0,
1402: CTL_NET, PF_INET, IPPROTO_UDP, CTL_CREATE,
1403: CTL_EOL);
1.139 elad 1404: sysctl_createv(clog, 0, NULL, NULL,
1405: CTLFLAG_PERMANENT,
1406: CTLTYPE_STRUCT, "stats",
1407: SYSCTL_DESCR("UDP statistics"),
1408: NULL, 0, &udpstat, sizeof(udpstat),
1409: CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_STATS,
1410: CTL_EOL);
1.1 cgd 1411: }
1.72 itojun 1412: #endif
1.130 manu 1413:
1414: #if (defined INET && defined IPSEC_NAT_T)
1415: /*
1416: * Returns:
1417: * 1 if the packet was processed
1418: * 0 if normal UDP processing should take place
1.144 manu 1419: * -1 if an error occurent and m was freed
1.130 manu 1420: */
1421: static int
1.144 manu 1422: udp4_espinudp(mp, off, src, so)
1423: struct mbuf **mp;
1.130 manu 1424: int off;
1425: struct sockaddr *src;
1426: struct socket *so;
1427: {
1428: size_t len;
1429: caddr_t data;
1430: struct inpcb *inp;
1431: size_t skip = 0;
1432: size_t minlen;
1433: size_t iphdrlen;
1434: struct ip *ip;
1435: struct mbuf *n;
1.136 manu 1436: struct m_tag *tag;
1437: struct udphdr *udphdr;
1438: u_int16_t sport, dport;
1.144 manu 1439: struct mbuf *m = *mp;
1.130 manu 1440:
1.131 perry 1441: /*
1.130 manu 1442: * Collapse the mbuf chain if the first mbuf is too short
1443: * The longest case is: UDP + non ESP marker + ESP
1444: */
1445: minlen = off + sizeof(u_int64_t) + sizeof(struct esp);
1446: if (minlen > m->m_pkthdr.len)
1447: minlen = m->m_pkthdr.len;
1448:
1449: if (m->m_len < minlen) {
1.144 manu 1450: if ((*mp = m_pullup(m, minlen)) == NULL) {
1.130 manu 1451: printf("udp4_espinudp: m_pullup failed\n");
1.144 manu 1452: return -1;
1.130 manu 1453: }
1.144 manu 1454: m = *mp;
1.130 manu 1455: }
1456:
1.131 perry 1457: len = m->m_len - off;
1.130 manu 1458: data = mtod(m, caddr_t) + off;
1459: inp = sotoinpcb(so);
1460:
1461: /* Ignore keepalive packets */
1462: if ((len == 1) && (data[0] == '\xff')) {
1463: return 1;
1464: }
1465:
1.131 perry 1466: /*
1467: * Check that the payload is long enough to hold
1.130 manu 1468: * an ESP header and compute the length of encapsulation
1.131 perry 1469: * header to remove
1.130 manu 1470: */
1471: if (inp->inp_flags & INP_ESPINUDP) {
1472: u_int32_t *st = (u_int32_t *)data;
1473:
1474: if ((len <= sizeof(struct esp)) || (*st == 0))
1475: return 0; /* Normal UDP processing */
1476:
1477: skip = sizeof(struct udphdr);
1478: }
1479:
1480: if (inp->inp_flags & INP_ESPINUDP_NON_IKE) {
1.142 kleink 1481: u_int32_t *st = (u_int32_t *)data;
1.130 manu 1482:
1483: if ((len <= sizeof(u_int64_t) + sizeof(struct esp))
1.142 kleink 1484: || ((st[0] | st[1]) != 0))
1.130 manu 1485: return 0; /* Normal UDP processing */
1.131 perry 1486:
1.130 manu 1487: skip = sizeof(struct udphdr) + sizeof(u_int64_t);
1488: }
1489:
1490: /*
1.136 manu 1491: * Get the UDP ports. They are handled in network
1492: * order everywhere in IPSEC_NAT_T code.
1493: */
1494: udphdr = (struct udphdr *)(data - skip);
1495: sport = udphdr->uh_sport;
1496: dport = udphdr->uh_dport;
1497:
1498: /*
1.130 manu 1499: * Remove the UDP header (and possibly the non ESP marker)
1500: * IP header lendth is iphdrlen
1.131 perry 1501: * Before:
1.130 manu 1502: * <--- off --->
1503: * +----+------+-----+
1504: * | IP | UDP | ESP |
1505: * +----+------+-----+
1506: * <-skip->
1507: * After:
1508: * +----+-----+
1509: * | IP | ESP |
1510: * +----+-----+
1511: * <-skip->
1512: */
1513: iphdrlen = off - sizeof(struct udphdr);
1514: memmove(mtod(m, caddr_t) + skip, mtod(m, caddr_t), iphdrlen);
1515: m_adj(m, skip);
1516:
1517: ip = mtod(m, struct ip *);
1518: ip->ip_len = htons(ntohs(ip->ip_len) - skip);
1519: ip->ip_p = IPPROTO_ESP;
1520:
1521: /*
1.131 perry 1522: * Copy the mbuf to avoid multiple free, as both
1523: * esp4_input (which we call) and udp_input (which
1.130 manu 1524: * called us) free the mbuf.
1525: */
1526: if ((n = m_dup(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
1527: printf("udp4_espinudp: m_dup failed\n");
1528: return 0;
1529: }
1530:
1.136 manu 1531: /*
1532: * Add a PACKET_TAG_IPSEC_NAT_T_PORT tag to remember
1533: * the source UDP port. This is required if we want
1534: * to select the right SPD for multiple hosts behind
1535: * same NAT
1536: */
1.137 manu 1537: if ((tag = m_tag_get(PACKET_TAG_IPSEC_NAT_T_PORTS,
1538: sizeof(sport) + sizeof(dport), M_DONTWAIT)) == NULL) {
1539: printf("udp4_espinudp: m_tag_get failed\n");
1.138 manu 1540: m_freem(n);
1.137 manu 1541: return 0;
1542: }
1.136 manu 1543: ((u_int16_t *)(tag + 1))[0] = sport;
1544: ((u_int16_t *)(tag + 1))[1] = dport;
1545: m_tag_prepend(n, tag);
1546:
1.130 manu 1547: esp4_input(n, iphdrlen);
1548:
1549: /* We handled it, it shoudln't be handled by UDP */
1550: return 1;
1551: }
1552: #endif
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