Annotation of src/sys/netinet/udp_usrreq.c, Revision 1.168
1.168 ! thorpej 1: /* $NetBSD: udp_usrreq.c,v 1.167 2008/04/15 03:57:04 thorpej 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>
1.168 ! thorpej 64: __KERNEL_RCSID(0, "$NetBSD: udp_usrreq.c,v 1.167 2008/04/15 03:57:04 thorpej 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>
1.166 thorpej 97: #include <netinet/udp_private.h>
1.1 cgd 98:
1.53 itojun 99: #ifdef INET6
100: #include <netinet/ip6.h>
101: #include <netinet/icmp6.h>
102: #include <netinet6/ip6_var.h>
1.167 thorpej 103: #include <netinet6/ip6_private.h>
1.53 itojun 104: #include <netinet6/in6_pcb.h>
105: #include <netinet6/udp6_var.h>
1.168 ! thorpej 106: #include <netinet6/udp6_private.h>
1.146 rpaulo 107: #include <netinet6/scope6_var.h>
1.53 itojun 108: #endif
109:
110: #ifndef INET6
111: /* always need ip6.h for IP6_EXTHDR_GET */
112: #include <netinet/ip6.h>
113: #endif
114:
1.76 itojun 115: #include "faith.h"
116: #if defined(NFAITH) && NFAITH > 0
117: #include <net/if_faith.h>
118: #endif
119:
1.27 christos 120: #include <machine/stdarg.h>
121:
1.105 jonathan 122: #ifdef FAST_IPSEC
123: #include <netipsec/ipsec.h>
1.121 jonathan 124: #include <netipsec/ipsec_var.h> /* XXX ipsecstat namespace */
1.147 christos 125: #include <netipsec/esp.h>
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>
1.147 christos 133: #include <netinet6/esp.h>
1.48 itojun 134: #include <netkey/key.h>
135: #endif /*IPSEC*/
136:
1.64 ws 137: #ifdef IPKDB
138: #include <ipkdb/ipkdb.h>
139: #endif
140:
1.8 mycroft 141: /*
142: * UDP protocol implementation.
143: * Per RFC 768, August, 1980.
144: */
145: int udpcksum = 1;
1.141 yamt 146: int udp_do_loopback_cksum = 0;
1.93 matt 147:
148: struct inpcbtable udbtable;
1.164 thorpej 149:
1.166 thorpej 150: percpu_t *udpstat_percpu;
1.8 mycroft 151:
1.72 itojun 152: #ifdef INET
1.130 manu 153: #ifdef IPSEC_NAT_T
1.144 manu 154: static int udp4_espinudp (struct mbuf **, int, struct sockaddr *,
1.130 manu 155: struct socket *);
156: #endif
1.119 matt 157: static void udp4_sendup (struct mbuf *, int, struct sockaddr *,
158: struct socket *);
159: static int udp4_realinput (struct sockaddr_in *, struct sockaddr_in *,
1.144 manu 160: struct mbuf **, int);
1.129 yamt 161: static int udp4_input_checksum(struct mbuf *, const struct udphdr *, int, int);
1.72 itojun 162: #endif
1.53 itojun 163: #ifdef INET6
1.119 matt 164: static void udp6_sendup (struct mbuf *, int, struct sockaddr *,
165: struct socket *);
166: static int udp6_realinput (int, struct sockaddr_in6 *,
167: struct sockaddr_in6 *, struct mbuf *, int);
1.129 yamt 168: static int udp6_input_checksum(struct mbuf *, const struct udphdr *, int, int);
1.53 itojun 169: #endif
1.72 itojun 170: #ifdef INET
1.119 matt 171: static void udp_notify (struct inpcb *, int);
1.72 itojun 172: #endif
1.7 mycroft 173:
1.26 mycroft 174: #ifndef UDBHASHSIZE
175: #define UDBHASHSIZE 128
176: #endif
177: int udbhashsize = UDBHASHSIZE;
178:
1.98 matt 179: #ifdef MBUFTRACE
1.150 dogcow 180: struct mowner udp_mowner = MOWNER_INIT("udp", "");
181: struct mowner udp_rx_mowner = MOWNER_INIT("udp", "rx");
182: struct mowner udp_tx_mowner = MOWNER_INIT("udp", "tx");
1.98 matt 183: #endif
184:
1.78 thorpej 185: #ifdef UDP_CSUM_COUNTERS
186: #include <sys/device.h>
187:
1.140 yamt 188: #if defined(INET)
1.78 thorpej 189: struct evcnt udp_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
190: NULL, "udp", "hwcsum bad");
191: struct evcnt udp_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
192: NULL, "udp", "hwcsum ok");
193: struct evcnt udp_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
194: NULL, "udp", "hwcsum data");
195: struct evcnt udp_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
196: NULL, "udp", "swcsum");
197:
1.120 matt 198: EVCNT_ATTACH_STATIC(udp_hwcsum_bad);
199: EVCNT_ATTACH_STATIC(udp_hwcsum_ok);
200: EVCNT_ATTACH_STATIC(udp_hwcsum_data);
201: EVCNT_ATTACH_STATIC(udp_swcsum);
1.140 yamt 202: #endif /* defined(INET) */
203:
204: #if defined(INET6)
205: struct evcnt udp6_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
206: NULL, "udp6", "hwcsum bad");
207: struct evcnt udp6_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
208: NULL, "udp6", "hwcsum ok");
209: struct evcnt udp6_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
210: NULL, "udp6", "hwcsum data");
211: struct evcnt udp6_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
212: NULL, "udp6", "swcsum");
213:
214: EVCNT_ATTACH_STATIC(udp6_hwcsum_bad);
215: EVCNT_ATTACH_STATIC(udp6_hwcsum_ok);
216: EVCNT_ATTACH_STATIC(udp6_hwcsum_data);
217: EVCNT_ATTACH_STATIC(udp6_swcsum);
218: #endif /* defined(INET6) */
219:
220: #define UDP_CSUM_COUNTER_INCR(ev) (ev)->ev_count++
1.120 matt 221:
1.78 thorpej 222: #else
223:
224: #define UDP_CSUM_COUNTER_INCR(ev) /* nothing */
225:
226: #endif /* UDP_CSUM_COUNTERS */
227:
1.7 mycroft 228: void
1.119 matt 229: udp_init(void)
1.1 cgd 230: {
1.18 mycroft 231:
1.35 mycroft 232: in_pcbinit(&udbtable, udbhashsize, udbhashsize);
1.78 thorpej 233:
1.98 matt 234: MOWNER_ATTACH(&udp_tx_mowner);
235: MOWNER_ATTACH(&udp_rx_mowner);
236: MOWNER_ATTACH(&udp_mowner);
1.166 thorpej 237:
238: udpstat_percpu = percpu_alloc(sizeof(uint64_t) * UDP_NSTATS);
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:
1.166 thorpej 333: UDP_STATINC(UDP_STAT_BADSUM);
1.129 yamt 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);
1.166 thorpej 355: UDP_STATINC(UDP_STAT_IPACKETS);
1.53 itojun 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) {
1.166 thorpej 363: UDP_STATINC(UDP_STAT_HDROPS);
1.53 itojun 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)) {
1.166 thorpej 380: UDP_STATINC(UDP_STAT_BADLEN);
1.53 itojun 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. */
1.159 dyoung 393: sockaddr_in_init(&src, &ip->ip_src, uh->uh_sport);
394: sockaddr_in_init(&dst, &ip->ip_dst, uh->uh_dport);
1.53 itojun 395:
1.144 manu 396: if ((n = udp4_realinput(&src, &dst, &m, iphlen)) == -1) {
1.166 thorpej 397: UDP_STATINC(UDP_STAT_HDROPS);
1.144 manu 398: return;
399: }
1.53 itojun 400: #ifdef INET6
401: if (IN_MULTICAST(ip->ip_dst.s_addr) || n == 0) {
402: struct sockaddr_in6 src6, dst6;
403:
404: bzero(&src6, sizeof(src6));
405: src6.sin6_family = AF_INET6;
406: src6.sin6_len = sizeof(struct sockaddr_in6);
407: src6.sin6_addr.s6_addr[10] = src6.sin6_addr.s6_addr[11] = 0xff;
408: bcopy(&ip->ip_src, &src6.sin6_addr.s6_addr[12],
409: sizeof(ip->ip_src));
410: src6.sin6_port = uh->uh_sport;
411: bzero(&dst6, sizeof(dst6));
412: dst6.sin6_family = AF_INET6;
413: dst6.sin6_len = sizeof(struct sockaddr_in6);
414: dst6.sin6_addr.s6_addr[10] = dst6.sin6_addr.s6_addr[11] = 0xff;
415: bcopy(&ip->ip_dst, &dst6.sin6_addr.s6_addr[12],
416: sizeof(ip->ip_dst));
417: dst6.sin6_port = uh->uh_dport;
418:
419: n += udp6_realinput(AF_INET, &src6, &dst6, m, iphlen);
420: }
421: #endif
422:
423: if (n == 0) {
424: if (m->m_flags & (M_BCAST | M_MCAST)) {
1.166 thorpej 425: UDP_STATINC(UDP_STAT_NOPORTBCAST);
1.53 itojun 426: goto bad;
427: }
1.166 thorpej 428: UDP_STATINC(UDP_STAT_NOPORT);
1.64 ws 429: #ifdef IPKDB
1.53 itojun 430: if (checkipkdb(&ip->ip_src, uh->uh_sport, uh->uh_dport,
431: m, iphlen + sizeof(struct udphdr),
432: m->m_pkthdr.len - iphlen - sizeof(struct udphdr))) {
433: /*
434: * It was a debugger connect packet,
435: * just drop it now
436: */
437: goto bad;
438: }
439: #endif
440: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
441: m = NULL;
442: }
443:
444: bad:
445: if (m)
446: m_freem(m);
1.78 thorpej 447: return;
448:
449: badcsum:
450: m_freem(m);
1.53 itojun 451: }
1.72 itojun 452: #endif
1.53 itojun 453:
454: #ifdef INET6
1.129 yamt 455: static int
456: udp6_input_checksum(struct mbuf *m, const struct udphdr *uh, int off, int len)
457: {
458:
1.140 yamt 459: /*
460: * XXX it's better to record and check if this mbuf is
461: * already checked.
462: */
463:
1.129 yamt 464: if (__predict_false((m->m_flags & M_LOOP) && !udp_do_loopback_cksum)) {
465: goto good;
466: }
467: if (uh->uh_sum == 0) {
1.168 ! thorpej 468: UDP6_STATINC(UDP6_STAT_NOSUM);
1.129 yamt 469: goto bad;
470: }
1.140 yamt 471:
472: switch (m->m_pkthdr.csum_flags &
473: ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv6) |
474: M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) {
475: case M_CSUM_UDPv6|M_CSUM_TCP_UDP_BAD:
476: UDP_CSUM_COUNTER_INCR(&udp6_hwcsum_bad);
1.168 ! thorpej 477: UDP6_STATINC(UDP6_STAT_BADSUM);
1.129 yamt 478: goto bad;
1.140 yamt 479:
480: #if 0 /* notyet */
481: case M_CSUM_UDPv6|M_CSUM_DATA:
482: #endif
483:
484: case M_CSUM_UDPv6:
485: /* Checksum was okay. */
486: UDP_CSUM_COUNTER_INCR(&udp6_hwcsum_ok);
487: break;
488:
489: default:
490: /*
491: * Need to compute it ourselves. Maybe skip checksum
492: * on loopback interfaces.
493: */
494: UDP_CSUM_COUNTER_INCR(&udp6_swcsum);
495: if (in6_cksum(m, IPPROTO_UDP, off, len) != 0) {
1.168 ! thorpej 496: UDP6_STATINC(UDP6_STAT_BADSUM);
1.140 yamt 497: goto bad;
498: }
1.129 yamt 499: }
500:
501: good:
502: return 0;
503: bad:
504: return -1;
505: }
506:
1.53 itojun 507: int
1.154 yamt 508: udp6_input(struct mbuf **mp, int *offp, int proto)
1.53 itojun 509: {
510: struct mbuf *m = *mp;
511: int off = *offp;
512: struct sockaddr_in6 src, dst;
513: struct ip6_hdr *ip6;
514: struct udphdr *uh;
515: u_int32_t plen, ulen;
516:
1.76 itojun 517: ip6 = mtod(m, struct ip6_hdr *);
518:
1.53 itojun 519: #if defined(NFAITH) && 0 < NFAITH
1.76 itojun 520: if (faithprefix(&ip6->ip6_dst)) {
521: /* send icmp6 host unreach? */
522: m_freem(m);
523: return IPPROTO_DONE;
1.53 itojun 524: }
525: #endif
526:
1.168 ! thorpej 527: UDP6_STATINC(UDP6_STAT_IPACKETS);
1.53 itojun 528:
529: /* check for jumbogram is done in ip6_input. we can trust pkthdr.len */
530: plen = m->m_pkthdr.len - off;
531: IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(struct udphdr));
532: if (uh == NULL) {
1.167 thorpej 533: IP6_STATINC(IP6_STAT_TOOSHORT);
1.53 itojun 534: return IPPROTO_DONE;
535: }
1.95 thorpej 536: KASSERT(UDP_HDR_ALIGNED_P(uh));
1.53 itojun 537: ulen = ntohs((u_short)uh->uh_ulen);
1.69 itojun 538: /*
539: * RFC2675 section 4: jumbograms will have 0 in the UDP header field,
540: * iff payload length > 0xffff.
541: */
1.53 itojun 542: if (ulen == 0 && plen > 0xffff)
543: ulen = plen;
544:
545: if (plen != ulen) {
1.168 ! thorpej 546: UDP6_STATINC(UDP6_STAT_BADLEN);
1.54 itojun 547: goto bad;
548: }
549:
1.57 itojun 550: /* destination port of 0 is illegal, based on RFC768. */
551: if (uh->uh_dport == 0)
552: goto bad;
553:
1.54 itojun 554: /* Be proactive about malicious use of IPv4 mapped address */
555: if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
556: IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
557: /* XXX stat */
1.53 itojun 558: goto bad;
559: }
560:
561: /*
1.125 thorpej 562: * Checksum extended UDP header and data. Maybe skip checksum
563: * on loopback interfaces.
1.53 itojun 564: */
1.129 yamt 565: if (udp6_input_checksum(m, uh, off, ulen))
566: goto bad;
1.53 itojun 567:
568: /*
569: * Construct source and dst sockaddrs.
570: */
571: bzero(&src, sizeof(src));
572: src.sin6_family = AF_INET6;
573: src.sin6_len = sizeof(struct sockaddr_in6);
1.146 rpaulo 574: src.sin6_addr = ip6->ip6_src;
1.53 itojun 575: src.sin6_port = uh->uh_sport;
576: bzero(&dst, sizeof(dst));
577: dst.sin6_family = AF_INET6;
578: dst.sin6_len = sizeof(struct sockaddr_in6);
1.146 rpaulo 579: dst.sin6_addr = ip6->ip6_dst;
1.53 itojun 580: dst.sin6_port = uh->uh_dport;
581:
582: if (udp6_realinput(AF_INET6, &src, &dst, m, off) == 0) {
583: if (m->m_flags & M_MCAST) {
1.168 ! thorpej 584: UDP6_STATINC(UDP6_STAT_NOPORTMCAST);
1.53 itojun 585: goto bad;
586: }
1.168 ! thorpej 587: UDP6_STATINC(UDP6_STAT_NOPORT);
1.53 itojun 588: icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
589: m = NULL;
590: }
591:
592: bad:
593: if (m)
594: m_freem(m);
595: return IPPROTO_DONE;
596: }
597: #endif
598:
1.72 itojun 599: #ifdef INET
1.53 itojun 600: static void
1.119 matt 601: udp4_sendup(struct mbuf *m, int off /* offset of data portion */,
602: struct sockaddr *src, struct socket *so)
1.53 itojun 603: {
604: struct mbuf *opts = NULL;
605: struct mbuf *n;
606: struct inpcb *inp = NULL;
607:
608: if (!so)
609: return;
610: switch (so->so_proto->pr_domain->dom_family) {
611: case AF_INET:
612: inp = sotoinpcb(so);
613: break;
614: #ifdef INET6
615: case AF_INET6:
616: break;
617: #endif
618: default:
619: return;
620: }
621:
1.105 jonathan 622: #if defined(IPSEC) || defined(FAST_IPSEC)
1.53 itojun 623: /* check AH/ESP integrity. */
624: if (so != NULL && ipsec4_in_reject_so(m, so)) {
625: ipsecstat.in_polvio++;
1.162 dyoung 626: if ((n = m_copypacket(m, M_DONTWAIT)) != NULL)
1.110 itojun 627: icmp_error(n, ICMP_UNREACH, ICMP_UNREACH_ADMIN_PROHIBIT,
628: 0, 0);
1.53 itojun 629: return;
630: }
631: #endif /*IPSEC*/
632:
1.162 dyoung 633: if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) {
1.53 itojun 634: if (inp && (inp->inp_flags & INP_CONTROLOPTS
635: || so->so_options & SO_TIMESTAMP)) {
636: struct ip *ip = mtod(n, struct ip *);
637: ip_savecontrol(inp, &opts, ip, n);
638: }
639:
640: m_adj(n, off);
641: if (sbappendaddr(&so->so_rcv, src, n,
642: opts) == 0) {
643: m_freem(n);
644: if (opts)
645: m_freem(opts);
1.124 darrenr 646: so->so_rcv.sb_overflowed++;
1.166 thorpej 647: UDP_STATINC(UDP_STAT_FULLSOCK);
1.53 itojun 648: } else
649: sorwakeup(so);
650: }
651: }
1.72 itojun 652: #endif
1.53 itojun 653:
654: #ifdef INET6
655: static void
1.119 matt 656: udp6_sendup(struct mbuf *m, int off /* offset of data portion */,
657: struct sockaddr *src, struct socket *so)
1.53 itojun 658: {
659: struct mbuf *opts = NULL;
660: struct mbuf *n;
661: struct in6pcb *in6p = NULL;
662:
663: if (!so)
664: return;
665: if (so->so_proto->pr_domain->dom_family != AF_INET6)
666: return;
667: in6p = sotoin6pcb(so);
668:
1.105 jonathan 669: #if defined(IPSEC) || defined(FAST_IPSEC)
1.53 itojun 670: /* check AH/ESP integrity. */
671: if (so != NULL && ipsec6_in_reject_so(m, so)) {
672: ipsec6stat.in_polvio++;
1.162 dyoung 673: if ((n = m_copypacket(m, M_DONTWAIT)) != NULL)
1.110 itojun 674: icmp6_error(n, ICMP6_DST_UNREACH,
675: ICMP6_DST_UNREACH_ADMIN, 0);
1.53 itojun 676: return;
677: }
678: #endif /*IPSEC*/
679:
1.162 dyoung 680: if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) {
1.53 itojun 681: if (in6p && (in6p->in6p_flags & IN6P_CONTROLOPTS
682: || in6p->in6p_socket->so_options & SO_TIMESTAMP)) {
683: struct ip6_hdr *ip6 = mtod(n, struct ip6_hdr *);
684: ip6_savecontrol(in6p, &opts, ip6, n);
685: }
686:
687: m_adj(n, off);
688: if (sbappendaddr(&so->so_rcv, src, n, opts) == 0) {
689: m_freem(n);
690: if (opts)
691: m_freem(opts);
1.124 darrenr 692: so->so_rcv.sb_overflowed++;
1.168 ! thorpej 693: UDP6_STATINC(UDP6_STAT_FULLSOCK);
1.53 itojun 694: } else
695: sorwakeup(so);
696: }
697: }
698: #endif
699:
1.72 itojun 700: #ifdef INET
1.53 itojun 701: static int
1.119 matt 702: udp4_realinput(struct sockaddr_in *src, struct sockaddr_in *dst,
1.144 manu 703: struct mbuf **mp, int off /* offset of udphdr */)
1.53 itojun 704: {
705: u_int16_t *sport, *dport;
706: int rcvcnt;
707: struct in_addr *src4, *dst4;
1.109 itojun 708: struct inpcb_hdr *inph;
1.53 itojun 709: struct inpcb *inp;
1.144 manu 710: struct mbuf *m = *mp;
1.53 itojun 711:
712: rcvcnt = 0;
713: off += sizeof(struct udphdr); /* now, offset of payload */
714:
715: if (src->sin_family != AF_INET || dst->sin_family != AF_INET)
716: goto bad;
717:
718: src4 = &src->sin_addr;
719: sport = &src->sin_port;
720: dst4 = &dst->sin_addr;
721: dport = &dst->sin_port;
722:
1.73 itojun 723: if (IN_MULTICAST(dst4->s_addr) ||
1.53 itojun 724: in_broadcast(*dst4, m->m_pkthdr.rcvif)) {
725: /*
726: * Deliver a multicast or broadcast datagram to *all* sockets
727: * for which the local and remote addresses and ports match
728: * those of the incoming datagram. This allows more than
729: * one process to receive multi/broadcasts on the same port.
730: * (This really ought to be done for unicast datagrams as
731: * well, but that would cause problems with existing
732: * applications that open both address-specific sockets and
733: * a wildcard socket listening to the same port -- they would
734: * end up receiving duplicates of every unicast datagram.
735: * Those applications open the multiple sockets to overcome an
736: * inadequacy of the UDP socket interface, but for backwards
737: * compatibility we avoid the problem here rather than
738: * fixing the interface. Maybe 4.5BSD will remedy this?)
739: */
740:
741: /*
1.92 itojun 742: * KAME note: traditionally we dropped udpiphdr from mbuf here.
1.71 itojun 743: * we need udpiphdr for IPsec processing so we do that later.
1.53 itojun 744: */
745: /*
746: * Locate pcb(s) for datagram.
747: */
1.109 itojun 748: CIRCLEQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) {
749: inp = (struct inpcb *)inph;
750: if (inp->inp_af != AF_INET)
751: continue;
752:
1.53 itojun 753: if (inp->inp_lport != *dport)
754: continue;
755: if (!in_nullhost(inp->inp_laddr)) {
756: if (!in_hosteq(inp->inp_laddr, *dst4))
757: continue;
758: }
759: if (!in_nullhost(inp->inp_faddr)) {
760: if (!in_hosteq(inp->inp_faddr, *src4) ||
761: inp->inp_fport != *sport)
762: continue;
763: }
764:
765: udp4_sendup(m, off, (struct sockaddr *)src,
766: inp->inp_socket);
767: rcvcnt++;
768:
769: /*
770: * Don't look for additional matches if this one does
771: * not have either the SO_REUSEPORT or SO_REUSEADDR
772: * socket options set. This heuristic avoids searching
773: * through all pcbs in the common case of a non-shared
774: * port. It assumes that an application will never
775: * clear these options after setting them.
776: */
777: if ((inp->inp_socket->so_options &
778: (SO_REUSEPORT|SO_REUSEADDR)) == 0)
779: break;
780: }
781: } else {
782: /*
783: * Locate pcb for datagram.
784: */
785: inp = in_pcblookup_connect(&udbtable, *src4, *sport, *dst4, *dport);
786: if (inp == 0) {
1.166 thorpej 787: UDP_STATINC(UDP_STAT_PCBHASHMISS);
1.53 itojun 788: inp = in_pcblookup_bind(&udbtable, *dst4, *dport);
1.82 itojun 789: if (inp == 0)
1.53 itojun 790: return rcvcnt;
791: }
792:
1.130 manu 793: #ifdef IPSEC_NAT_T
794: /* Handle ESP over UDP */
795: if (inp->inp_flags & INP_ESPINUDP_ALL) {
796: struct sockaddr *sa = (struct sockaddr *)src;
797:
1.144 manu 798: switch(udp4_espinudp(mp, off, sa, inp->inp_socket)) {
799: case -1: /* Error, m was freeed */
800: rcvcnt = -1;
801: goto bad;
802: break;
803:
804: case 1: /* ESP over UDP */
1.130 manu 805: rcvcnt++;
806: goto bad;
1.144 manu 807: break;
808:
809: case 0: /* plain UDP */
810: default: /* Unexpected */
811: /*
812: * Normal UDP processing will take place
813: * m may have changed.
814: */
815: m = *mp;
816: break;
1.130 manu 817: }
818: }
819: #endif
820:
1.53 itojun 821: udp4_sendup(m, off, (struct sockaddr *)src, inp->inp_socket);
822: rcvcnt++;
823: }
824:
825: bad:
826: return rcvcnt;
827: }
1.72 itojun 828: #endif
1.53 itojun 829:
830: #ifdef INET6
831: static int
1.119 matt 832: udp6_realinput(int af, struct sockaddr_in6 *src, struct sockaddr_in6 *dst,
833: struct mbuf *m, int off)
1.53 itojun 834: {
1.79 itojun 835: u_int16_t sport, dport;
1.53 itojun 836: int rcvcnt;
1.146 rpaulo 837: struct in6_addr src6, *dst6;
1.79 itojun 838: const struct in_addr *dst4;
1.109 itojun 839: struct inpcb_hdr *inph;
1.53 itojun 840: struct in6pcb *in6p;
841:
842: rcvcnt = 0;
843: off += sizeof(struct udphdr); /* now, offset of payload */
844:
845: if (af != AF_INET && af != AF_INET6)
846: goto bad;
847: if (src->sin6_family != AF_INET6 || dst->sin6_family != AF_INET6)
848: goto bad;
849:
1.146 rpaulo 850: src6 = src->sin6_addr;
851: if (sa6_recoverscope(src) != 0) {
852: /* XXX: should be impossible. */
853: goto bad;
854: }
1.79 itojun 855: sport = src->sin6_port;
1.146 rpaulo 856:
1.79 itojun 857: dport = dst->sin6_port;
1.88 itojun 858: dst4 = (struct in_addr *)&dst->sin6_addr.s6_addr[12];
1.146 rpaulo 859: dst6 = &dst->sin6_addr;
1.53 itojun 860:
1.146 rpaulo 861: if (IN6_IS_ADDR_MULTICAST(dst6) ||
1.79 itojun 862: (af == AF_INET && IN_MULTICAST(dst4->s_addr))) {
1.53 itojun 863: /*
864: * Deliver a multicast or broadcast datagram to *all* sockets
865: * for which the local and remote addresses and ports match
866: * those of the incoming datagram. This allows more than
867: * one process to receive multi/broadcasts on the same port.
868: * (This really ought to be done for unicast datagrams as
869: * well, but that would cause problems with existing
870: * applications that open both address-specific sockets and
871: * a wildcard socket listening to the same port -- they would
872: * end up receiving duplicates of every unicast datagram.
873: * Those applications open the multiple sockets to overcome an
874: * inadequacy of the UDP socket interface, but for backwards
875: * compatibility we avoid the problem here rather than
876: * fixing the interface. Maybe 4.5BSD will remedy this?)
877: */
878:
879: /*
1.92 itojun 880: * KAME note: traditionally we dropped udpiphdr from mbuf here.
1.71 itojun 881: * we need udpiphdr for IPsec processing so we do that later.
1.53 itojun 882: */
883: /*
884: * Locate pcb(s) for datagram.
885: */
1.109 itojun 886: CIRCLEQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) {
887: in6p = (struct in6pcb *)inph;
888: if (in6p->in6p_af != AF_INET6)
889: continue;
890:
1.79 itojun 891: if (in6p->in6p_lport != dport)
1.53 itojun 892: continue;
893: if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
1.146 rpaulo 894: if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr,
895: dst6))
1.53 itojun 896: continue;
1.92 itojun 897: } else {
1.146 rpaulo 898: if (IN6_IS_ADDR_V4MAPPED(dst6) &&
1.85 itojun 899: (in6p->in6p_flags & IN6P_IPV6_V6ONLY))
1.55 itojun 900: continue;
901: }
1.53 itojun 902: if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
1.79 itojun 903: if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr,
904: &src6) || in6p->in6p_fport != sport)
1.53 itojun 905: continue;
1.92 itojun 906: } else {
1.79 itojun 907: if (IN6_IS_ADDR_V4MAPPED(&src6) &&
1.85 itojun 908: (in6p->in6p_flags & IN6P_IPV6_V6ONLY))
1.55 itojun 909: continue;
910: }
1.53 itojun 911:
912: udp6_sendup(m, off, (struct sockaddr *)src,
913: in6p->in6p_socket);
914: rcvcnt++;
915:
916: /*
917: * Don't look for additional matches if this one does
918: * not have either the SO_REUSEPORT or SO_REUSEADDR
919: * socket options set. This heuristic avoids searching
920: * through all pcbs in the common case of a non-shared
921: * port. It assumes that an application will never
922: * clear these options after setting them.
923: */
924: if ((in6p->in6p_socket->so_options &
925: (SO_REUSEPORT|SO_REUSEADDR)) == 0)
926: break;
927: }
928: } else {
929: /*
930: * Locate pcb for datagram.
931: */
1.146 rpaulo 932: in6p = in6_pcblookup_connect(&udbtable, &src6, sport, dst6,
933: dport, 0);
1.53 itojun 934: if (in6p == 0) {
1.166 thorpej 935: UDP_STATINC(UDP_STAT_PCBHASHMISS);
1.146 rpaulo 936: in6p = in6_pcblookup_bind(&udbtable, dst6, dport, 0);
1.82 itojun 937: if (in6p == 0)
1.53 itojun 938: return rcvcnt;
939: }
940:
941: udp6_sendup(m, off, (struct sockaddr *)src, in6p->in6p_socket);
942: rcvcnt++;
943: }
944:
945: bad:
946: return rcvcnt;
947: }
948: #endif
1.1 cgd 949:
1.72 itojun 950: #ifdef INET
1.1 cgd 951: /*
952: * Notify a udp user of an asynchronous error;
953: * just wake up so that he can collect error status.
954: */
1.7 mycroft 955: static void
1.119 matt 956: udp_notify(struct inpcb *inp, int errno)
1.1 cgd 957: {
958: inp->inp_socket->so_error = errno;
959: sorwakeup(inp->inp_socket);
960: sowwakeup(inp->inp_socket);
961: }
962:
1.27 christos 963: void *
1.157 dyoung 964: udp_ctlinput(int cmd, const struct sockaddr *sa, void *v)
1.1 cgd 965: {
1.66 augustss 966: struct ip *ip = v;
967: struct udphdr *uh;
1.119 matt 968: void (*notify)(struct inpcb *, int) = udp_notify;
1.21 mycroft 969: int errno;
1.1 cgd 970:
1.53 itojun 971: if (sa->sa_family != AF_INET
972: || sa->sa_len != sizeof(struct sockaddr_in))
1.51 itojun 973: return NULL;
1.20 mycroft 974: if ((unsigned)cmd >= PRC_NCMDS)
1.27 christos 975: return NULL;
1.20 mycroft 976: errno = inetctlerrmap[cmd];
1.18 mycroft 977: if (PRC_IS_REDIRECT(cmd))
1.19 mycroft 978: notify = in_rtchange, ip = 0;
1.18 mycroft 979: else if (cmd == PRC_HOSTDEAD)
1.19 mycroft 980: ip = 0;
1.23 cgd 981: else if (errno == 0)
1.27 christos 982: return NULL;
1.19 mycroft 983: if (ip) {
1.158 christos 984: uh = (struct udphdr *)((char *)ip + (ip->ip_hl << 2));
1.157 dyoung 985: in_pcbnotify(&udbtable, satocsin(sa)->sin_addr, uh->uh_dport,
1.34 mycroft 986: ip->ip_src, uh->uh_sport, errno, notify);
1.53 itojun 987:
988: /* XXX mapped address case */
1.19 mycroft 989: } else
1.157 dyoung 990: in_pcbnotifyall(&udbtable, satocsin(sa)->sin_addr, errno,
1.34 mycroft 991: notify);
1.27 christos 992: return NULL;
1.1 cgd 993: }
994:
1.7 mycroft 995: int
1.152 yamt 996: udp_ctloutput(int op, struct socket *so, int level, int optname,
997: struct mbuf **mp)
1.130 manu 998: {
999: int s;
1000: int error = 0;
1001: struct mbuf *m;
1002: struct inpcb *inp;
1003: int family;
1004:
1005: family = so->so_proto->pr_domain->dom_family;
1006:
1007: s = splsoftnet();
1008: switch (family) {
1009: #ifdef INET
1010: case PF_INET:
1011: if (level != IPPROTO_UDP) {
1012: error = ip_ctloutput(op, so, level, optname, mp);
1013: goto end;
1014: }
1015: break;
1016: #endif
1017: #ifdef INET6
1018: case PF_INET6:
1019: if (level != IPPROTO_UDP) {
1020: error = ip6_ctloutput(op, so, level, optname, mp);
1021: goto end;
1022: }
1023: break;
1024: #endif
1025: default:
1026: error = EAFNOSUPPORT;
1027: goto end;
1028: }
1029:
1030:
1031: switch (op) {
1032: case PRCO_SETOPT:
1033: m = *mp;
1034: inp = sotoinpcb(so);
1035:
1036: switch (optname) {
1037: case UDP_ENCAP:
1.163 christos 1038: if (m == NULL || m->m_len != sizeof(int)) {
1.130 manu 1039: error = EINVAL;
1.153 yamt 1040: break;
1.130 manu 1041: }
1.131 perry 1042:
1.130 manu 1043: switch(*mtod(m, int *)) {
1044: #ifdef IPSEC_NAT_T
1045: case 0:
1046: inp->inp_flags &= ~INP_ESPINUDP_ALL;
1047: break;
1048:
1049: case UDP_ENCAP_ESPINUDP:
1050: inp->inp_flags &= ~INP_ESPINUDP_ALL;
1051: inp->inp_flags |= INP_ESPINUDP;
1052: break;
1.131 perry 1053:
1.130 manu 1054: case UDP_ENCAP_ESPINUDP_NON_IKE:
1055: inp->inp_flags &= ~INP_ESPINUDP_ALL;
1056: inp->inp_flags |= INP_ESPINUDP_NON_IKE;
1057: break;
1058: #endif
1059: default:
1060: error = EINVAL;
1061: break;
1062: }
1063: break;
1064:
1065: default:
1066: error = ENOPROTOOPT;
1067: break;
1068: }
1.155 yamt 1069: if (m != NULL) {
1070: m_free(m);
1071: }
1.130 manu 1072: break;
1073:
1074: default:
1075: error = EINVAL;
1076: break;
1.131 perry 1077: }
1078:
1.130 manu 1079: end:
1080: splx(s);
1081: return error;
1082: }
1.131 perry 1083:
1.130 manu 1084:
1085: int
1.27 christos 1086: udp_output(struct mbuf *m, ...)
1087: {
1.66 augustss 1088: struct inpcb *inp;
1089: struct udpiphdr *ui;
1.125 thorpej 1090: struct route *ro;
1.66 augustss 1091: int len = m->m_pkthdr.len;
1.31 mycroft 1092: int error = 0;
1.27 christos 1093: va_list ap;
1094:
1.98 matt 1095: MCLAIM(m, &udp_tx_mowner);
1.27 christos 1096: va_start(ap, m);
1097: inp = va_arg(ap, struct inpcb *);
1098: va_end(ap);
1.1 cgd 1099:
1100: /*
1101: * Calculate data length and get a mbuf
1102: * for UDP and IP headers.
1103: */
1.13 mycroft 1104: M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT);
1105: if (m == 0) {
1106: error = ENOBUFS;
1.39 thorpej 1107: goto release;
1108: }
1109:
1110: /*
1111: * Compute the packet length of the IP header, and
1112: * punt if the length looks bogus.
1113: */
1.96 itojun 1114: if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) {
1.39 thorpej 1115: error = EMSGSIZE;
1.13 mycroft 1116: goto release;
1117: }
1.1 cgd 1118:
1119: /*
1120: * Fill in mbuf with extended UDP header
1121: * and addresses and length put into network format.
1122: */
1123: ui = mtod(m, struct udpiphdr *);
1124: ui->ui_pr = IPPROTO_UDP;
1125: ui->ui_src = inp->inp_laddr;
1126: ui->ui_dst = inp->inp_faddr;
1127: ui->ui_sport = inp->inp_lport;
1128: ui->ui_dport = inp->inp_fport;
1.78 thorpej 1129: ui->ui_ulen = htons((u_int16_t)len + sizeof(struct udphdr));
1.1 cgd 1130:
1.125 thorpej 1131: ro = &inp->inp_route;
1132:
1.1 cgd 1133: /*
1.78 thorpej 1134: * Set up checksum and output datagram.
1.1 cgd 1135: */
1136: if (udpcksum) {
1.78 thorpej 1137: /*
1138: * XXX Cache pseudo-header checksum part for
1139: * XXX "connected" UDP sockets.
1140: */
1141: ui->ui_sum = in_cksum_phdr(ui->ui_src.s_addr,
1142: ui->ui_dst.s_addr, htons((u_int16_t)len +
1143: sizeof(struct udphdr) + IPPROTO_UDP));
1.135 yamt 1144: m->m_pkthdr.csum_flags = M_CSUM_UDPv4;
1.78 thorpej 1145: m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
1146: } else
1147: ui->ui_sum = 0;
1.96 itojun 1148: ((struct ip *)ui)->ip_len = htons(sizeof (struct udpiphdr) + len);
1.1 cgd 1149: ((struct ip *)ui)->ip_ttl = inp->inp_ip.ip_ttl; /* XXX */
1150: ((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; /* XXX */
1.166 thorpej 1151: UDP_STATINC(UDP_STAT_OPACKETS);
1.48 itojun 1152:
1.125 thorpej 1153: return (ip_output(m, inp->inp_options, ro,
1.12 mycroft 1154: inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST),
1.107 itojun 1155: inp->inp_moptions, inp->inp_socket));
1.1 cgd 1156:
1157: release:
1158: m_freem(m);
1159: return (error);
1160: }
1161:
1.42 thorpej 1162: int udp_sendspace = 9216; /* really max datagram size */
1163: int udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in));
1.1 cgd 1164: /* 40 1K datagrams */
1165:
1166: /*ARGSUSED*/
1.7 mycroft 1167: int
1.119 matt 1168: udp_usrreq(struct socket *so, int req, struct mbuf *m, struct mbuf *nam,
1.145 christos 1169: struct mbuf *control, struct lwp *l)
1.1 cgd 1170: {
1.66 augustss 1171: struct inpcb *inp;
1.1 cgd 1172: int s;
1.66 augustss 1173: int error = 0;
1.1 cgd 1174:
1175: if (req == PRU_CONTROL)
1.158 christos 1176: return (in_control(so, (long)m, (void *)nam,
1.148 ad 1177: (struct ifnet *)control, l));
1.59 thorpej 1178:
1.149 tls 1179: s = splsoftnet();
1180:
1.60 thorpej 1181: if (req == PRU_PURGEIF) {
1.80 itojun 1182: in_pcbpurgeif0(&udbtable, (struct ifnet *)control);
1.60 thorpej 1183: in_purgeif((struct ifnet *)control);
1184: in_pcbpurgeif(&udbtable, (struct ifnet *)control);
1.149 tls 1185: splx(s);
1.59 thorpej 1186: return (0);
1187: }
1.31 mycroft 1188:
1189: inp = sotoinpcb(so);
1.32 mycroft 1190: #ifdef DIAGNOSTIC
1191: if (req != PRU_SEND && req != PRU_SENDOOB && control)
1192: panic("udp_usrreq: unexpected control mbuf");
1193: #endif
1.31 mycroft 1194: if (inp == 0 && req != PRU_ATTACH) {
1195: error = EINVAL;
1196: goto release;
1197: }
1198:
1.1 cgd 1199: /*
1200: * Note: need to block udp_input while changing
1201: * the udp pcb queue and/or pcb addresses.
1202: */
1203: switch (req) {
1204:
1205: case PRU_ATTACH:
1.31 mycroft 1206: if (inp != 0) {
1207: error = EISCONN;
1.1 cgd 1208: break;
1209: }
1.98 matt 1210: #ifdef MBUFTRACE
1211: so->so_mowner = &udp_mowner;
1212: so->so_rcv.sb_mowner = &udp_rx_mowner;
1213: so->so_snd.sb_mowner = &udp_tx_mowner;
1214: #endif
1.31 mycroft 1215: if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
1216: error = soreserve(so, udp_sendspace, udp_recvspace);
1217: if (error)
1218: break;
1219: }
1.18 mycroft 1220: error = in_pcballoc(so, &udbtable);
1.1 cgd 1221: if (error)
1222: break;
1.31 mycroft 1223: inp = sotoinpcb(so);
1224: inp->inp_ip.ip_ttl = ip_defttl;
1.1 cgd 1225: break;
1226:
1227: case PRU_DETACH:
1.31 mycroft 1228: in_pcbdetach(inp);
1.1 cgd 1229: break;
1230:
1231: case PRU_BIND:
1.148 ad 1232: error = in_pcbbind(inp, nam, l);
1.1 cgd 1233: break;
1234:
1235: case PRU_LISTEN:
1236: error = EOPNOTSUPP;
1237: break;
1238:
1239: case PRU_CONNECT:
1.148 ad 1240: error = in_pcbconnect(inp, nam, l);
1.31 mycroft 1241: if (error)
1.1 cgd 1242: break;
1.31 mycroft 1243: soisconnected(so);
1.1 cgd 1244: break;
1245:
1246: case PRU_CONNECT2:
1247: error = EOPNOTSUPP;
1248: break;
1249:
1250: case PRU_DISCONNECT:
1.31 mycroft 1251: /*soisdisconnected(so);*/
1252: so->so_state &= ~SS_ISCONNECTED; /* XXX */
1.1 cgd 1253: in_pcbdisconnect(inp);
1.34 mycroft 1254: inp->inp_laddr = zeroin_addr; /* XXX */
1.35 mycroft 1255: in_pcbstate(inp, INP_BOUND); /* XXX */
1.1 cgd 1256: break;
1257:
1258: case PRU_SHUTDOWN:
1259: socantsendmore(so);
1260: break;
1261:
1.31 mycroft 1262: case PRU_RCVD:
1263: error = EOPNOTSUPP;
1.1 cgd 1264: break;
1265:
1.31 mycroft 1266: case PRU_SEND:
1.32 mycroft 1267: if (control && control->m_len) {
1268: m_freem(control);
1269: m_freem(m);
1270: error = EINVAL;
1271: break;
1272: }
1.31 mycroft 1273: {
1.35 mycroft 1274: struct in_addr laddr; /* XXX */
1.1 cgd 1275:
1.31 mycroft 1276: if (nam) {
1.35 mycroft 1277: laddr = inp->inp_laddr; /* XXX */
1.31 mycroft 1278: if ((so->so_state & SS_ISCONNECTED) != 0) {
1279: error = EISCONN;
1.32 mycroft 1280: goto die;
1.31 mycroft 1281: }
1.148 ad 1282: error = in_pcbconnect(inp, nam, l);
1.100 matt 1283: if (error)
1284: goto die;
1.31 mycroft 1285: } else {
1286: if ((so->so_state & SS_ISCONNECTED) == 0) {
1287: error = ENOTCONN;
1.32 mycroft 1288: goto die;
1.31 mycroft 1289: }
1290: }
1.33 mycroft 1291: error = udp_output(m, inp);
1.100 matt 1292: m = NULL;
1.31 mycroft 1293: if (nam) {
1294: in_pcbdisconnect(inp);
1.35 mycroft 1295: inp->inp_laddr = laddr; /* XXX */
1296: in_pcbstate(inp, INP_BOUND); /* XXX */
1.31 mycroft 1297: }
1.100 matt 1298: die:
1299: if (m)
1300: m_freem(m);
1.31 mycroft 1301: }
1.1 cgd 1302: break;
1303:
1304: case PRU_SENSE:
1305: /*
1306: * stat: don't bother with a blocksize.
1307: */
1.31 mycroft 1308: splx(s);
1.1 cgd 1309: return (0);
1310:
1.31 mycroft 1311: case PRU_RCVOOB:
1312: error = EOPNOTSUPP;
1313: break;
1314:
1.1 cgd 1315: case PRU_SENDOOB:
1.32 mycroft 1316: m_freem(control);
1.31 mycroft 1317: m_freem(m);
1.1 cgd 1318: error = EOPNOTSUPP;
1319: break;
1320:
1.31 mycroft 1321: case PRU_SOCKADDR:
1322: in_setsockaddr(inp, nam);
1323: break;
1324:
1325: case PRU_PEERADDR:
1326: in_setpeeraddr(inp, nam);
1327: break;
1.1 cgd 1328:
1329: default:
1330: panic("udp_usrreq");
1331: }
1332:
1333: release:
1.31 mycroft 1334: splx(s);
1.1 cgd 1335: return (error);
1.13 mycroft 1336: }
1337:
1.166 thorpej 1338: static void
1339: udpstat_convert_to_user_cb(void *v1, void *v2, struct cpu_info *ci)
1340: {
1341: uint64_t *udpsc = v1;
1342: uint64_t *udps = v2;
1343: u_int i;
1344:
1345: for (i = 0; i < UDP_NSTATS; i++)
1346: udps[i] += udpsc[i];
1347: }
1348:
1349: static void
1350: udpstat_convert_to_user(uint64_t *udps)
1351: {
1352:
1353: memset(udps, 0, sizeof(uint64_t) * UDP_NSTATS);
1354: percpu_foreach(udpstat_percpu, udpstat_convert_to_user_cb, udps);
1355: }
1356:
1357: static int
1358: sysctl_net_inet_udp_stats(SYSCTLFN_ARGS)
1359: {
1360: struct sysctlnode node;
1361: uint64_t udps[UDP_NSTATS];
1362:
1363: udpstat_convert_to_user(udps);
1364: node = *rnode;
1365: node.sysctl_data = udps;
1366: node.sysctl_size = sizeof(udps);
1367: return (sysctl_lookup(SYSCTLFN_CALL(&node)));
1368: }
1369:
1.13 mycroft 1370: /*
1371: * Sysctl for udp variables.
1372: */
1.114 atatat 1373: SYSCTL_SETUP(sysctl_net_inet_udp_setup, "sysctl net.inet.udp subtree setup")
1.13 mycroft 1374: {
1.114 atatat 1375:
1.116 atatat 1376: sysctl_createv(clog, 0, NULL, NULL,
1377: CTLFLAG_PERMANENT,
1.114 atatat 1378: CTLTYPE_NODE, "net", NULL,
1379: NULL, 0, NULL, 0,
1380: CTL_NET, CTL_EOL);
1.116 atatat 1381: sysctl_createv(clog, 0, NULL, NULL,
1382: CTLFLAG_PERMANENT,
1.114 atatat 1383: CTLTYPE_NODE, "inet", NULL,
1384: NULL, 0, NULL, 0,
1385: CTL_NET, PF_INET, CTL_EOL);
1.116 atatat 1386: sysctl_createv(clog, 0, NULL, NULL,
1387: CTLFLAG_PERMANENT,
1.122 atatat 1388: CTLTYPE_NODE, "udp",
1389: SYSCTL_DESCR("UDPv4 related settings"),
1.114 atatat 1390: NULL, 0, NULL, 0,
1391: CTL_NET, PF_INET, IPPROTO_UDP, CTL_EOL);
1392:
1.116 atatat 1393: sysctl_createv(clog, 0, NULL, NULL,
1394: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122 atatat 1395: CTLTYPE_INT, "checksum",
1.123 heas 1396: SYSCTL_DESCR("Compute UDP checksums"),
1.114 atatat 1397: NULL, 0, &udpcksum, 0,
1398: CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_CHECKSUM,
1399: CTL_EOL);
1.116 atatat 1400: sysctl_createv(clog, 0, NULL, NULL,
1401: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122 atatat 1402: CTLTYPE_INT, "sendspace",
1403: SYSCTL_DESCR("Default UDP send buffer size"),
1.114 atatat 1404: NULL, 0, &udp_sendspace, 0,
1405: CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_SENDSPACE,
1406: CTL_EOL);
1.116 atatat 1407: sysctl_createv(clog, 0, NULL, NULL,
1408: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122 atatat 1409: CTLTYPE_INT, "recvspace",
1410: SYSCTL_DESCR("Default UDP receive buffer size"),
1.114 atatat 1411: NULL, 0, &udp_recvspace, 0,
1412: CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_RECVSPACE,
1413: CTL_EOL);
1.125 thorpej 1414: sysctl_createv(clog, 0, NULL, NULL,
1415: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1416: CTLTYPE_INT, "do_loopback_cksum",
1417: SYSCTL_DESCR("Perform UDP checksum on loopback"),
1418: NULL, 0, &udp_do_loopback_cksum, 0,
1419: CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_LOOPBACKCKSUM,
1420: CTL_EOL);
1.132 atatat 1421: sysctl_createv(clog, 0, NULL, NULL,
1422: CTLFLAG_PERMANENT,
1.134 atatat 1423: CTLTYPE_STRUCT, "pcblist",
1.132 atatat 1424: SYSCTL_DESCR("UDP protocol control block list"),
1425: sysctl_inpcblist, 0, &udbtable, 0,
1426: CTL_NET, PF_INET, IPPROTO_UDP, CTL_CREATE,
1427: CTL_EOL);
1.139 elad 1428: sysctl_createv(clog, 0, NULL, NULL,
1429: CTLFLAG_PERMANENT,
1430: CTLTYPE_STRUCT, "stats",
1431: SYSCTL_DESCR("UDP statistics"),
1.166 thorpej 1432: sysctl_net_inet_udp_stats, 0, NULL, 0,
1.139 elad 1433: CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_STATS,
1434: CTL_EOL);
1.1 cgd 1435: }
1.72 itojun 1436: #endif
1.130 manu 1437:
1.166 thorpej 1438: void
1439: udp_statinc(u_int stat)
1440: {
1441:
1442: KASSERT(stat < UDP_NSTATS);
1443: UDP_STATINC(stat);
1444: }
1445:
1.130 manu 1446: #if (defined INET && defined IPSEC_NAT_T)
1447: /*
1448: * Returns:
1449: * 1 if the packet was processed
1450: * 0 if normal UDP processing should take place
1.144 manu 1451: * -1 if an error occurent and m was freed
1.130 manu 1452: */
1453: static int
1.154 yamt 1454: udp4_espinudp(struct mbuf **mp, int off, struct sockaddr *src,
1.151 christos 1455: struct socket *so)
1.130 manu 1456: {
1457: size_t len;
1.158 christos 1458: void *data;
1.130 manu 1459: struct inpcb *inp;
1460: size_t skip = 0;
1461: size_t minlen;
1462: size_t iphdrlen;
1463: struct ip *ip;
1464: struct mbuf *n;
1.136 manu 1465: struct m_tag *tag;
1466: struct udphdr *udphdr;
1467: u_int16_t sport, dport;
1.144 manu 1468: struct mbuf *m = *mp;
1.130 manu 1469:
1.131 perry 1470: /*
1.130 manu 1471: * Collapse the mbuf chain if the first mbuf is too short
1472: * The longest case is: UDP + non ESP marker + ESP
1473: */
1474: minlen = off + sizeof(u_int64_t) + sizeof(struct esp);
1475: if (minlen > m->m_pkthdr.len)
1476: minlen = m->m_pkthdr.len;
1477:
1478: if (m->m_len < minlen) {
1.144 manu 1479: if ((*mp = m_pullup(m, minlen)) == NULL) {
1.130 manu 1480: printf("udp4_espinudp: m_pullup failed\n");
1.144 manu 1481: return -1;
1.130 manu 1482: }
1.144 manu 1483: m = *mp;
1.130 manu 1484: }
1485:
1.131 perry 1486: len = m->m_len - off;
1.158 christos 1487: data = mtod(m, char *) + off;
1.130 manu 1488: inp = sotoinpcb(so);
1489:
1490: /* Ignore keepalive packets */
1.158 christos 1491: if ((len == 1) && (*(unsigned char *)data == 0xff)) {
1.130 manu 1492: return 1;
1493: }
1494:
1.131 perry 1495: /*
1496: * Check that the payload is long enough to hold
1.130 manu 1497: * an ESP header and compute the length of encapsulation
1.131 perry 1498: * header to remove
1.130 manu 1499: */
1500: if (inp->inp_flags & INP_ESPINUDP) {
1501: u_int32_t *st = (u_int32_t *)data;
1502:
1503: if ((len <= sizeof(struct esp)) || (*st == 0))
1504: return 0; /* Normal UDP processing */
1505:
1506: skip = sizeof(struct udphdr);
1507: }
1508:
1509: if (inp->inp_flags & INP_ESPINUDP_NON_IKE) {
1.142 kleink 1510: u_int32_t *st = (u_int32_t *)data;
1.130 manu 1511:
1512: if ((len <= sizeof(u_int64_t) + sizeof(struct esp))
1.142 kleink 1513: || ((st[0] | st[1]) != 0))
1.130 manu 1514: return 0; /* Normal UDP processing */
1.131 perry 1515:
1.130 manu 1516: skip = sizeof(struct udphdr) + sizeof(u_int64_t);
1517: }
1518:
1519: /*
1.136 manu 1520: * Get the UDP ports. They are handled in network
1521: * order everywhere in IPSEC_NAT_T code.
1522: */
1.158 christos 1523: udphdr = (struct udphdr *)((char *)data - skip);
1.136 manu 1524: sport = udphdr->uh_sport;
1525: dport = udphdr->uh_dport;
1526:
1527: /*
1.130 manu 1528: * Remove the UDP header (and possibly the non ESP marker)
1529: * IP header lendth is iphdrlen
1.131 perry 1530: * Before:
1.130 manu 1531: * <--- off --->
1532: * +----+------+-----+
1533: * | IP | UDP | ESP |
1534: * +----+------+-----+
1535: * <-skip->
1536: * After:
1537: * +----+-----+
1538: * | IP | ESP |
1539: * +----+-----+
1540: * <-skip->
1541: */
1542: iphdrlen = off - sizeof(struct udphdr);
1.158 christos 1543: memmove(mtod(m, char *) + skip, mtod(m, void *), iphdrlen);
1.130 manu 1544: m_adj(m, skip);
1545:
1546: ip = mtod(m, struct ip *);
1547: ip->ip_len = htons(ntohs(ip->ip_len) - skip);
1548: ip->ip_p = IPPROTO_ESP;
1549:
1550: /*
1.131 perry 1551: * Copy the mbuf to avoid multiple free, as both
1552: * esp4_input (which we call) and udp_input (which
1.130 manu 1553: * called us) free the mbuf.
1554: */
1555: if ((n = m_dup(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
1556: printf("udp4_espinudp: m_dup failed\n");
1557: return 0;
1558: }
1559:
1.136 manu 1560: /*
1561: * Add a PACKET_TAG_IPSEC_NAT_T_PORT tag to remember
1562: * the source UDP port. This is required if we want
1563: * to select the right SPD for multiple hosts behind
1564: * same NAT
1565: */
1.137 manu 1566: if ((tag = m_tag_get(PACKET_TAG_IPSEC_NAT_T_PORTS,
1567: sizeof(sport) + sizeof(dport), M_DONTWAIT)) == NULL) {
1568: printf("udp4_espinudp: m_tag_get failed\n");
1.138 manu 1569: m_freem(n);
1.137 manu 1570: return 0;
1571: }
1.136 manu 1572: ((u_int16_t *)(tag + 1))[0] = sport;
1573: ((u_int16_t *)(tag + 1))[1] = dport;
1574: m_tag_prepend(n, tag);
1575:
1.147 christos 1576: #ifdef FAST_IPSEC
1.160 degroote 1577: ipsec4_common_input(n, iphdrlen, IPPROTO_ESP);
1.147 christos 1578: #else
1.130 manu 1579: esp4_input(n, iphdrlen);
1.147 christos 1580: #endif
1.130 manu 1581:
1582: /* We handled it, it shoudln't be handled by UDP */
1583: return 1;
1584: }
1585: #endif
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