Annotation of src/sys/netinet/udp_usrreq.c, Revision 1.172.2.1
1.172.2.1! wrstuden 1: /* $NetBSD: udp_usrreq.c,v 1.172 2008/05/04 07:22:14 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>
1.172.2.1! wrstuden 64: __KERNEL_RCSID(0, "$NetBSD: udp_usrreq.c,v 1.172 2008/05/04 07:22:14 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>
1.169 thorpej 124: #include <netipsec/ipsec_var.h>
125: #include <netipsec/ipsec_private.h>
1.147 christos 126: #include <netipsec/esp.h>
1.105 jonathan 127: #ifdef INET6
128: #include <netipsec/ipsec6.h>
129: #endif
1.169 thorpej 130: #endif /* FAST_IPSEC */
1.105 jonathan 131:
1.48 itojun 132: #ifdef IPSEC
133: #include <netinet6/ipsec.h>
1.169 thorpej 134: #include <netinet6/ipsec_private.h>
1.147 christos 135: #include <netinet6/esp.h>
1.48 itojun 136: #include <netkey/key.h>
1.169 thorpej 137: #endif /* IPSEC */
1.48 itojun 138:
1.64 ws 139: #ifdef IPKDB
140: #include <ipkdb/ipkdb.h>
141: #endif
142:
1.8 mycroft 143: /*
144: * UDP protocol implementation.
145: * Per RFC 768, August, 1980.
146: */
147: int udpcksum = 1;
1.141 yamt 148: int udp_do_loopback_cksum = 0;
1.93 matt 149:
150: struct inpcbtable udbtable;
1.164 thorpej 151:
1.166 thorpej 152: percpu_t *udpstat_percpu;
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
1.150 dogcow 182: struct mowner udp_mowner = MOWNER_INIT("udp", "");
183: struct mowner udp_rx_mowner = MOWNER_INIT("udp", "rx");
184: struct mowner udp_tx_mowner = MOWNER_INIT("udp", "tx");
1.98 matt 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);
1.166 thorpej 239:
1.171 yamt 240: #ifdef INET
1.166 thorpej 241: udpstat_percpu = percpu_alloc(sizeof(uint64_t) * UDP_NSTATS);
1.171 yamt 242: #endif
243: #ifdef INET6
244: udp6stat_percpu = percpu_alloc(sizeof(uint64_t) * UDP6_NSTATS);
245: #endif
1.1 cgd 246: }
247:
1.129 yamt 248: /*
249: * Checksum extended UDP header and data.
250: */
251:
252: int
253: udp_input_checksum(int af, struct mbuf *m, const struct udphdr *uh,
254: int iphlen, int len)
255: {
256:
257: switch (af) {
1.72 itojun 258: #ifdef INET
1.129 yamt 259: case AF_INET:
260: return udp4_input_checksum(m, uh, iphlen, len);
261: #endif
262: #ifdef INET6
263: case AF_INET6:
264: return udp6_input_checksum(m, uh, iphlen, len);
265: #endif
266: }
267: #ifdef DIAGNOSTIC
268: panic("udp_input_checksum: unknown af %d", af);
269: #endif
270: /* NOTREACHED */
271: return -1;
272: }
273:
274: #ifdef INET
275:
276: /*
277: * Checksum extended UDP header and data.
278: */
279:
280: static int
281: udp4_input_checksum(struct mbuf *m, const struct udphdr *uh,
282: int iphlen, int len)
283: {
284:
285: /*
286: * XXX it's better to record and check if this mbuf is
287: * already checked.
288: */
289:
290: if (uh->uh_sum == 0)
291: return 0;
292:
293: switch (m->m_pkthdr.csum_flags &
294: ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv4) |
295: M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) {
296: case M_CSUM_UDPv4|M_CSUM_TCP_UDP_BAD:
297: UDP_CSUM_COUNTER_INCR(&udp_hwcsum_bad);
298: goto badcsum;
299:
300: case M_CSUM_UDPv4|M_CSUM_DATA: {
301: u_int32_t hw_csum = m->m_pkthdr.csum_data;
302:
303: UDP_CSUM_COUNTER_INCR(&udp_hwcsum_data);
304: if (m->m_pkthdr.csum_flags & M_CSUM_NO_PSEUDOHDR) {
305: const struct ip *ip =
306: mtod(m, const struct ip *);
307:
308: hw_csum = in_cksum_phdr(ip->ip_src.s_addr,
309: ip->ip_dst.s_addr,
310: htons(hw_csum + len + IPPROTO_UDP));
311: }
312: if ((hw_csum ^ 0xffff) != 0)
313: goto badcsum;
314: break;
315: }
316:
317: case M_CSUM_UDPv4:
318: /* Checksum was okay. */
319: UDP_CSUM_COUNTER_INCR(&udp_hwcsum_ok);
320: break;
321:
322: default:
323: /*
324: * Need to compute it ourselves. Maybe skip checksum
325: * on loopback interfaces.
326: */
327: if (__predict_true(!(m->m_pkthdr.rcvif->if_flags &
328: IFF_LOOPBACK) ||
329: udp_do_loopback_cksum)) {
330: UDP_CSUM_COUNTER_INCR(&udp_swcsum);
331: if (in4_cksum(m, IPPROTO_UDP, iphlen, len) != 0)
332: goto badcsum;
333: }
334: break;
335: }
336:
337: return 0;
338:
339: badcsum:
1.166 thorpej 340: UDP_STATINC(UDP_STAT_BADSUM);
1.129 yamt 341: return -1;
342: }
343:
1.7 mycroft 344: void
1.27 christos 345: udp_input(struct mbuf *m, ...)
1.1 cgd 346: {
1.53 itojun 347: va_list ap;
348: struct sockaddr_in src, dst;
349: struct ip *ip;
350: struct udphdr *uh;
1.97 simonb 351: int iphlen;
1.53 itojun 352: int len;
353: int n;
1.96 itojun 354: u_int16_t ip_len;
1.53 itojun 355:
356: va_start(ap, m);
357: iphlen = va_arg(ap, int);
1.97 simonb 358: (void)va_arg(ap, int); /* ignore value, advance ap */
1.53 itojun 359: va_end(ap);
360:
1.98 matt 361: MCLAIM(m, &udp_rx_mowner);
1.166 thorpej 362: UDP_STATINC(UDP_STAT_IPACKETS);
1.53 itojun 363:
364: /*
365: * Get IP and UDP header together in first mbuf.
366: */
367: ip = mtod(m, struct ip *);
368: IP6_EXTHDR_GET(uh, struct udphdr *, m, iphlen, sizeof(struct udphdr));
369: if (uh == NULL) {
1.166 thorpej 370: UDP_STATINC(UDP_STAT_HDROPS);
1.53 itojun 371: return;
372: }
1.95 thorpej 373: KASSERT(UDP_HDR_ALIGNED_P(uh));
1.53 itojun 374:
1.57 itojun 375: /* destination port of 0 is illegal, based on RFC768. */
376: if (uh->uh_dport == 0)
377: goto bad;
378:
1.53 itojun 379: /*
380: * Make mbuf data length reflect UDP length.
381: * If not enough data to reflect UDP length, drop.
382: */
1.96 itojun 383: ip_len = ntohs(ip->ip_len);
1.53 itojun 384: len = ntohs((u_int16_t)uh->uh_ulen);
1.96 itojun 385: if (ip_len != iphlen + len) {
386: if (ip_len < iphlen + len || len < sizeof(struct udphdr)) {
1.166 thorpej 387: UDP_STATINC(UDP_STAT_BADLEN);
1.53 itojun 388: goto bad;
389: }
1.96 itojun 390: m_adj(m, iphlen + len - ip_len);
1.53 itojun 391: }
392:
393: /*
394: * Checksum extended UDP header and data.
395: */
1.129 yamt 396: if (udp4_input_checksum(m, uh, iphlen, len))
397: goto badcsum;
1.53 itojun 398:
399: /* construct source and dst sockaddrs. */
1.159 dyoung 400: sockaddr_in_init(&src, &ip->ip_src, uh->uh_sport);
401: sockaddr_in_init(&dst, &ip->ip_dst, uh->uh_dport);
1.53 itojun 402:
1.144 manu 403: if ((n = udp4_realinput(&src, &dst, &m, iphlen)) == -1) {
1.166 thorpej 404: UDP_STATINC(UDP_STAT_HDROPS);
1.144 manu 405: return;
406: }
1.53 itojun 407: #ifdef INET6
408: if (IN_MULTICAST(ip->ip_dst.s_addr) || n == 0) {
409: struct sockaddr_in6 src6, dst6;
410:
411: bzero(&src6, sizeof(src6));
412: src6.sin6_family = AF_INET6;
413: src6.sin6_len = sizeof(struct sockaddr_in6);
414: src6.sin6_addr.s6_addr[10] = src6.sin6_addr.s6_addr[11] = 0xff;
415: bcopy(&ip->ip_src, &src6.sin6_addr.s6_addr[12],
416: sizeof(ip->ip_src));
417: src6.sin6_port = uh->uh_sport;
418: bzero(&dst6, sizeof(dst6));
419: dst6.sin6_family = AF_INET6;
420: dst6.sin6_len = sizeof(struct sockaddr_in6);
421: dst6.sin6_addr.s6_addr[10] = dst6.sin6_addr.s6_addr[11] = 0xff;
422: bcopy(&ip->ip_dst, &dst6.sin6_addr.s6_addr[12],
423: sizeof(ip->ip_dst));
424: dst6.sin6_port = uh->uh_dport;
425:
426: n += udp6_realinput(AF_INET, &src6, &dst6, m, iphlen);
427: }
428: #endif
429:
430: if (n == 0) {
431: if (m->m_flags & (M_BCAST | M_MCAST)) {
1.166 thorpej 432: UDP_STATINC(UDP_STAT_NOPORTBCAST);
1.53 itojun 433: goto bad;
434: }
1.166 thorpej 435: UDP_STATINC(UDP_STAT_NOPORT);
1.64 ws 436: #ifdef IPKDB
1.53 itojun 437: if (checkipkdb(&ip->ip_src, uh->uh_sport, uh->uh_dport,
438: m, iphlen + sizeof(struct udphdr),
439: m->m_pkthdr.len - iphlen - sizeof(struct udphdr))) {
440: /*
441: * It was a debugger connect packet,
442: * just drop it now
443: */
444: goto bad;
445: }
446: #endif
447: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
448: m = NULL;
449: }
450:
451: bad:
452: if (m)
453: m_freem(m);
1.78 thorpej 454: return;
455:
456: badcsum:
457: m_freem(m);
1.53 itojun 458: }
1.72 itojun 459: #endif
1.53 itojun 460:
461: #ifdef INET6
1.129 yamt 462: static int
463: udp6_input_checksum(struct mbuf *m, const struct udphdr *uh, int off, int len)
464: {
465:
1.140 yamt 466: /*
467: * XXX it's better to record and check if this mbuf is
468: * already checked.
469: */
470:
1.129 yamt 471: if (__predict_false((m->m_flags & M_LOOP) && !udp_do_loopback_cksum)) {
472: goto good;
473: }
474: if (uh->uh_sum == 0) {
1.168 thorpej 475: UDP6_STATINC(UDP6_STAT_NOSUM);
1.129 yamt 476: goto bad;
477: }
1.140 yamt 478:
479: switch (m->m_pkthdr.csum_flags &
480: ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv6) |
481: M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) {
482: case M_CSUM_UDPv6|M_CSUM_TCP_UDP_BAD:
483: UDP_CSUM_COUNTER_INCR(&udp6_hwcsum_bad);
1.168 thorpej 484: UDP6_STATINC(UDP6_STAT_BADSUM);
1.129 yamt 485: goto bad;
1.140 yamt 486:
487: #if 0 /* notyet */
488: case M_CSUM_UDPv6|M_CSUM_DATA:
489: #endif
490:
491: case M_CSUM_UDPv6:
492: /* Checksum was okay. */
493: UDP_CSUM_COUNTER_INCR(&udp6_hwcsum_ok);
494: break;
495:
496: default:
497: /*
498: * Need to compute it ourselves. Maybe skip checksum
499: * on loopback interfaces.
500: */
501: UDP_CSUM_COUNTER_INCR(&udp6_swcsum);
502: if (in6_cksum(m, IPPROTO_UDP, off, len) != 0) {
1.168 thorpej 503: UDP6_STATINC(UDP6_STAT_BADSUM);
1.140 yamt 504: goto bad;
505: }
1.129 yamt 506: }
507:
508: good:
509: return 0;
510: bad:
511: return -1;
512: }
513:
1.53 itojun 514: int
1.154 yamt 515: udp6_input(struct mbuf **mp, int *offp, int proto)
1.53 itojun 516: {
517: struct mbuf *m = *mp;
518: int off = *offp;
519: struct sockaddr_in6 src, dst;
520: struct ip6_hdr *ip6;
521: struct udphdr *uh;
522: u_int32_t plen, ulen;
523:
1.76 itojun 524: ip6 = mtod(m, struct ip6_hdr *);
525:
1.53 itojun 526: #if defined(NFAITH) && 0 < NFAITH
1.76 itojun 527: if (faithprefix(&ip6->ip6_dst)) {
528: /* send icmp6 host unreach? */
529: m_freem(m);
530: return IPPROTO_DONE;
1.53 itojun 531: }
532: #endif
533:
1.168 thorpej 534: UDP6_STATINC(UDP6_STAT_IPACKETS);
1.53 itojun 535:
536: /* check for jumbogram is done in ip6_input. we can trust pkthdr.len */
537: plen = m->m_pkthdr.len - off;
538: IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(struct udphdr));
539: if (uh == NULL) {
1.167 thorpej 540: IP6_STATINC(IP6_STAT_TOOSHORT);
1.53 itojun 541: return IPPROTO_DONE;
542: }
1.95 thorpej 543: KASSERT(UDP_HDR_ALIGNED_P(uh));
1.53 itojun 544: ulen = ntohs((u_short)uh->uh_ulen);
1.69 itojun 545: /*
546: * RFC2675 section 4: jumbograms will have 0 in the UDP header field,
547: * iff payload length > 0xffff.
548: */
1.53 itojun 549: if (ulen == 0 && plen > 0xffff)
550: ulen = plen;
551:
552: if (plen != ulen) {
1.168 thorpej 553: UDP6_STATINC(UDP6_STAT_BADLEN);
1.54 itojun 554: goto bad;
555: }
556:
1.57 itojun 557: /* destination port of 0 is illegal, based on RFC768. */
558: if (uh->uh_dport == 0)
559: goto bad;
560:
1.54 itojun 561: /* Be proactive about malicious use of IPv4 mapped address */
562: if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
563: IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
564: /* XXX stat */
1.53 itojun 565: goto bad;
566: }
567:
568: /*
1.125 thorpej 569: * Checksum extended UDP header and data. Maybe skip checksum
570: * on loopback interfaces.
1.53 itojun 571: */
1.129 yamt 572: if (udp6_input_checksum(m, uh, off, ulen))
573: goto bad;
1.53 itojun 574:
575: /*
576: * Construct source and dst sockaddrs.
577: */
578: bzero(&src, sizeof(src));
579: src.sin6_family = AF_INET6;
580: src.sin6_len = sizeof(struct sockaddr_in6);
1.146 rpaulo 581: src.sin6_addr = ip6->ip6_src;
1.53 itojun 582: src.sin6_port = uh->uh_sport;
583: bzero(&dst, sizeof(dst));
584: dst.sin6_family = AF_INET6;
585: dst.sin6_len = sizeof(struct sockaddr_in6);
1.146 rpaulo 586: dst.sin6_addr = ip6->ip6_dst;
1.53 itojun 587: dst.sin6_port = uh->uh_dport;
588:
589: if (udp6_realinput(AF_INET6, &src, &dst, m, off) == 0) {
590: if (m->m_flags & M_MCAST) {
1.168 thorpej 591: UDP6_STATINC(UDP6_STAT_NOPORTMCAST);
1.53 itojun 592: goto bad;
593: }
1.168 thorpej 594: UDP6_STATINC(UDP6_STAT_NOPORT);
1.53 itojun 595: icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
596: m = NULL;
597: }
598:
599: bad:
600: if (m)
601: m_freem(m);
602: return IPPROTO_DONE;
603: }
604: #endif
605:
1.72 itojun 606: #ifdef INET
1.53 itojun 607: static void
1.119 matt 608: udp4_sendup(struct mbuf *m, int off /* offset of data portion */,
609: struct sockaddr *src, struct socket *so)
1.53 itojun 610: {
611: struct mbuf *opts = NULL;
612: struct mbuf *n;
613: struct inpcb *inp = NULL;
614:
615: if (!so)
616: return;
617: switch (so->so_proto->pr_domain->dom_family) {
618: case AF_INET:
619: inp = sotoinpcb(so);
620: break;
621: #ifdef INET6
622: case AF_INET6:
623: break;
624: #endif
625: default:
626: return;
627: }
628:
1.105 jonathan 629: #if defined(IPSEC) || defined(FAST_IPSEC)
1.53 itojun 630: /* check AH/ESP integrity. */
631: if (so != NULL && ipsec4_in_reject_so(m, so)) {
1.169 thorpej 632: IPSEC_STATINC(IPSEC_STAT_IN_POLVIO);
1.162 dyoung 633: if ((n = m_copypacket(m, M_DONTWAIT)) != NULL)
1.110 itojun 634: icmp_error(n, ICMP_UNREACH, ICMP_UNREACH_ADMIN_PROHIBIT,
635: 0, 0);
1.53 itojun 636: return;
637: }
638: #endif /*IPSEC*/
639:
1.162 dyoung 640: if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) {
1.53 itojun 641: if (inp && (inp->inp_flags & INP_CONTROLOPTS
642: || so->so_options & SO_TIMESTAMP)) {
643: struct ip *ip = mtod(n, struct ip *);
644: ip_savecontrol(inp, &opts, ip, n);
645: }
646:
647: m_adj(n, off);
648: if (sbappendaddr(&so->so_rcv, src, n,
649: opts) == 0) {
650: m_freem(n);
651: if (opts)
652: m_freem(opts);
1.124 darrenr 653: so->so_rcv.sb_overflowed++;
1.166 thorpej 654: UDP_STATINC(UDP_STAT_FULLSOCK);
1.53 itojun 655: } else
656: sorwakeup(so);
657: }
658: }
1.72 itojun 659: #endif
1.53 itojun 660:
661: #ifdef INET6
662: static void
1.119 matt 663: udp6_sendup(struct mbuf *m, int off /* offset of data portion */,
664: struct sockaddr *src, struct socket *so)
1.53 itojun 665: {
666: struct mbuf *opts = NULL;
667: struct mbuf *n;
668: struct in6pcb *in6p = NULL;
669:
670: if (!so)
671: return;
672: if (so->so_proto->pr_domain->dom_family != AF_INET6)
673: return;
674: in6p = sotoin6pcb(so);
675:
1.105 jonathan 676: #if defined(IPSEC) || defined(FAST_IPSEC)
1.53 itojun 677: /* check AH/ESP integrity. */
678: if (so != NULL && ipsec6_in_reject_so(m, so)) {
1.169 thorpej 679: IPSEC6_STATINC(IPSEC_STAT_IN_POLVIO);
1.162 dyoung 680: if ((n = m_copypacket(m, M_DONTWAIT)) != NULL)
1.110 itojun 681: icmp6_error(n, ICMP6_DST_UNREACH,
682: ICMP6_DST_UNREACH_ADMIN, 0);
1.53 itojun 683: return;
684: }
685: #endif /*IPSEC*/
686:
1.162 dyoung 687: if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) {
1.53 itojun 688: if (in6p && (in6p->in6p_flags & IN6P_CONTROLOPTS
689: || in6p->in6p_socket->so_options & SO_TIMESTAMP)) {
690: struct ip6_hdr *ip6 = mtod(n, struct ip6_hdr *);
691: ip6_savecontrol(in6p, &opts, ip6, n);
692: }
693:
694: m_adj(n, off);
695: if (sbappendaddr(&so->so_rcv, src, n, opts) == 0) {
696: m_freem(n);
697: if (opts)
698: m_freem(opts);
1.124 darrenr 699: so->so_rcv.sb_overflowed++;
1.168 thorpej 700: UDP6_STATINC(UDP6_STAT_FULLSOCK);
1.53 itojun 701: } else
702: sorwakeup(so);
703: }
704: }
705: #endif
706:
1.72 itojun 707: #ifdef INET
1.53 itojun 708: static int
1.119 matt 709: udp4_realinput(struct sockaddr_in *src, struct sockaddr_in *dst,
1.144 manu 710: struct mbuf **mp, int off /* offset of udphdr */)
1.53 itojun 711: {
712: u_int16_t *sport, *dport;
713: int rcvcnt;
714: struct in_addr *src4, *dst4;
1.109 itojun 715: struct inpcb_hdr *inph;
1.53 itojun 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: */
1.109 itojun 755: CIRCLEQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) {
756: inp = (struct inpcb *)inph;
757: if (inp->inp_af != AF_INET)
758: continue;
759:
1.53 itojun 760: if (inp->inp_lport != *dport)
761: continue;
762: if (!in_nullhost(inp->inp_laddr)) {
763: if (!in_hosteq(inp->inp_laddr, *dst4))
764: continue;
765: }
766: if (!in_nullhost(inp->inp_faddr)) {
767: if (!in_hosteq(inp->inp_faddr, *src4) ||
768: inp->inp_fport != *sport)
769: continue;
770: }
771:
772: udp4_sendup(m, off, (struct sockaddr *)src,
773: inp->inp_socket);
774: rcvcnt++;
775:
776: /*
777: * Don't look for additional matches if this one does
778: * not have either the SO_REUSEPORT or SO_REUSEADDR
779: * socket options set. This heuristic avoids searching
780: * through all pcbs in the common case of a non-shared
781: * port. It assumes that an application will never
782: * clear these options after setting them.
783: */
784: if ((inp->inp_socket->so_options &
785: (SO_REUSEPORT|SO_REUSEADDR)) == 0)
786: break;
787: }
788: } else {
789: /*
790: * Locate pcb for datagram.
791: */
792: inp = in_pcblookup_connect(&udbtable, *src4, *sport, *dst4, *dport);
793: if (inp == 0) {
1.166 thorpej 794: UDP_STATINC(UDP_STAT_PCBHASHMISS);
1.53 itojun 795: inp = in_pcblookup_bind(&udbtable, *dst4, *dport);
1.82 itojun 796: if (inp == 0)
1.53 itojun 797: return rcvcnt;
798: }
799:
1.130 manu 800: #ifdef IPSEC_NAT_T
801: /* Handle ESP over UDP */
802: if (inp->inp_flags & INP_ESPINUDP_ALL) {
803: struct sockaddr *sa = (struct sockaddr *)src;
804:
1.144 manu 805: switch(udp4_espinudp(mp, off, sa, inp->inp_socket)) {
806: case -1: /* Error, m was freeed */
807: rcvcnt = -1;
808: goto bad;
809: break;
810:
811: case 1: /* ESP over UDP */
1.130 manu 812: rcvcnt++;
813: goto bad;
1.144 manu 814: break;
815:
816: case 0: /* plain UDP */
817: default: /* Unexpected */
818: /*
819: * Normal UDP processing will take place
820: * m may have changed.
821: */
822: m = *mp;
823: break;
1.130 manu 824: }
825: }
826: #endif
827:
1.53 itojun 828: udp4_sendup(m, off, (struct sockaddr *)src, inp->inp_socket);
829: rcvcnt++;
830: }
831:
832: bad:
833: return rcvcnt;
834: }
1.72 itojun 835: #endif
1.53 itojun 836:
837: #ifdef INET6
838: static int
1.119 matt 839: udp6_realinput(int af, struct sockaddr_in6 *src, struct sockaddr_in6 *dst,
840: struct mbuf *m, int off)
1.53 itojun 841: {
1.79 itojun 842: u_int16_t sport, dport;
1.53 itojun 843: int rcvcnt;
1.146 rpaulo 844: struct in6_addr src6, *dst6;
1.79 itojun 845: const struct in_addr *dst4;
1.109 itojun 846: struct inpcb_hdr *inph;
1.53 itojun 847: struct in6pcb *in6p;
848:
849: rcvcnt = 0;
850: off += sizeof(struct udphdr); /* now, offset of payload */
851:
852: if (af != AF_INET && af != AF_INET6)
853: goto bad;
854: if (src->sin6_family != AF_INET6 || dst->sin6_family != AF_INET6)
855: goto bad;
856:
1.146 rpaulo 857: src6 = src->sin6_addr;
858: if (sa6_recoverscope(src) != 0) {
859: /* XXX: should be impossible. */
860: goto bad;
861: }
1.79 itojun 862: sport = src->sin6_port;
1.146 rpaulo 863:
1.79 itojun 864: dport = dst->sin6_port;
1.88 itojun 865: dst4 = (struct in_addr *)&dst->sin6_addr.s6_addr[12];
1.146 rpaulo 866: dst6 = &dst->sin6_addr;
1.53 itojun 867:
1.146 rpaulo 868: if (IN6_IS_ADDR_MULTICAST(dst6) ||
1.79 itojun 869: (af == AF_INET && IN_MULTICAST(dst4->s_addr))) {
1.53 itojun 870: /*
871: * Deliver a multicast or broadcast datagram to *all* sockets
872: * for which the local and remote addresses and ports match
873: * those of the incoming datagram. This allows more than
874: * one process to receive multi/broadcasts on the same port.
875: * (This really ought to be done for unicast datagrams as
876: * well, but that would cause problems with existing
877: * applications that open both address-specific sockets and
878: * a wildcard socket listening to the same port -- they would
879: * end up receiving duplicates of every unicast datagram.
880: * Those applications open the multiple sockets to overcome an
881: * inadequacy of the UDP socket interface, but for backwards
882: * compatibility we avoid the problem here rather than
883: * fixing the interface. Maybe 4.5BSD will remedy this?)
884: */
885:
886: /*
1.92 itojun 887: * KAME note: traditionally we dropped udpiphdr from mbuf here.
1.71 itojun 888: * we need udpiphdr for IPsec processing so we do that later.
1.53 itojun 889: */
890: /*
891: * Locate pcb(s) for datagram.
892: */
1.109 itojun 893: CIRCLEQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) {
894: in6p = (struct in6pcb *)inph;
895: if (in6p->in6p_af != AF_INET6)
896: continue;
897:
1.79 itojun 898: if (in6p->in6p_lport != dport)
1.53 itojun 899: continue;
900: if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
1.146 rpaulo 901: if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr,
902: dst6))
1.53 itojun 903: continue;
1.92 itojun 904: } else {
1.146 rpaulo 905: if (IN6_IS_ADDR_V4MAPPED(dst6) &&
1.85 itojun 906: (in6p->in6p_flags & IN6P_IPV6_V6ONLY))
1.55 itojun 907: continue;
908: }
1.53 itojun 909: if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
1.79 itojun 910: if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr,
911: &src6) || in6p->in6p_fport != sport)
1.53 itojun 912: continue;
1.92 itojun 913: } else {
1.79 itojun 914: if (IN6_IS_ADDR_V4MAPPED(&src6) &&
1.85 itojun 915: (in6p->in6p_flags & IN6P_IPV6_V6ONLY))
1.55 itojun 916: continue;
917: }
1.53 itojun 918:
919: udp6_sendup(m, off, (struct sockaddr *)src,
920: in6p->in6p_socket);
921: rcvcnt++;
922:
923: /*
924: * Don't look for additional matches if this one does
925: * not have either the SO_REUSEPORT or SO_REUSEADDR
926: * socket options set. This heuristic avoids searching
927: * through all pcbs in the common case of a non-shared
928: * port. It assumes that an application will never
929: * clear these options after setting them.
930: */
931: if ((in6p->in6p_socket->so_options &
932: (SO_REUSEPORT|SO_REUSEADDR)) == 0)
933: break;
934: }
935: } else {
936: /*
937: * Locate pcb for datagram.
938: */
1.146 rpaulo 939: in6p = in6_pcblookup_connect(&udbtable, &src6, sport, dst6,
940: dport, 0);
1.53 itojun 941: if (in6p == 0) {
1.166 thorpej 942: UDP_STATINC(UDP_STAT_PCBHASHMISS);
1.146 rpaulo 943: in6p = in6_pcblookup_bind(&udbtable, dst6, dport, 0);
1.82 itojun 944: if (in6p == 0)
1.53 itojun 945: return rcvcnt;
946: }
947:
948: udp6_sendup(m, off, (struct sockaddr *)src, in6p->in6p_socket);
949: rcvcnt++;
950: }
951:
952: bad:
953: return rcvcnt;
954: }
955: #endif
1.1 cgd 956:
1.72 itojun 957: #ifdef INET
1.1 cgd 958: /*
959: * Notify a udp user of an asynchronous error;
960: * just wake up so that he can collect error status.
961: */
1.7 mycroft 962: static void
1.119 matt 963: udp_notify(struct inpcb *inp, int errno)
1.1 cgd 964: {
965: inp->inp_socket->so_error = errno;
966: sorwakeup(inp->inp_socket);
967: sowwakeup(inp->inp_socket);
968: }
969:
1.27 christos 970: void *
1.157 dyoung 971: udp_ctlinput(int cmd, const struct sockaddr *sa, void *v)
1.1 cgd 972: {
1.66 augustss 973: struct ip *ip = v;
974: struct udphdr *uh;
1.119 matt 975: void (*notify)(struct inpcb *, int) = udp_notify;
1.21 mycroft 976: int errno;
1.1 cgd 977:
1.53 itojun 978: if (sa->sa_family != AF_INET
979: || sa->sa_len != sizeof(struct sockaddr_in))
1.51 itojun 980: return NULL;
1.20 mycroft 981: if ((unsigned)cmd >= PRC_NCMDS)
1.27 christos 982: return NULL;
1.20 mycroft 983: errno = inetctlerrmap[cmd];
1.18 mycroft 984: if (PRC_IS_REDIRECT(cmd))
1.19 mycroft 985: notify = in_rtchange, ip = 0;
1.18 mycroft 986: else if (cmd == PRC_HOSTDEAD)
1.19 mycroft 987: ip = 0;
1.23 cgd 988: else if (errno == 0)
1.27 christos 989: return NULL;
1.19 mycroft 990: if (ip) {
1.158 christos 991: uh = (struct udphdr *)((char *)ip + (ip->ip_hl << 2));
1.157 dyoung 992: in_pcbnotify(&udbtable, satocsin(sa)->sin_addr, uh->uh_dport,
1.34 mycroft 993: ip->ip_src, uh->uh_sport, errno, notify);
1.53 itojun 994:
995: /* XXX mapped address case */
1.19 mycroft 996: } else
1.157 dyoung 997: in_pcbnotifyall(&udbtable, satocsin(sa)->sin_addr, errno,
1.34 mycroft 998: notify);
1.27 christos 999: return NULL;
1.1 cgd 1000: }
1001:
1.7 mycroft 1002: int
1.172.2.1! wrstuden 1003: udp_ctloutput(int op, struct socket *so, struct sockopt *sopt)
1.130 manu 1004: {
1005: int s;
1006: int error = 0;
1007: struct inpcb *inp;
1008: int family;
1.172.2.1! wrstuden 1009: int optval;
1.130 manu 1010:
1011: family = so->so_proto->pr_domain->dom_family;
1012:
1013: s = splsoftnet();
1014: switch (family) {
1015: #ifdef INET
1016: case PF_INET:
1.172.2.1! wrstuden 1017: if (sopt->sopt_level != IPPROTO_UDP) {
! 1018: error = ip_ctloutput(op, so, sopt);
1.130 manu 1019: goto end;
1020: }
1021: break;
1022: #endif
1023: #ifdef INET6
1024: case PF_INET6:
1.172.2.1! wrstuden 1025: if (sopt->sopt_level != IPPROTO_UDP) {
! 1026: error = ip6_ctloutput(op, so, sopt);
1.130 manu 1027: goto end;
1028: }
1029: break;
1030: #endif
1031: default:
1032: error = EAFNOSUPPORT;
1033: goto end;
1034: }
1035:
1036:
1037: switch (op) {
1038: case PRCO_SETOPT:
1039: inp = sotoinpcb(so);
1040:
1.172.2.1! wrstuden 1041: switch (sopt->sopt_name) {
1.130 manu 1042: case UDP_ENCAP:
1.172.2.1! wrstuden 1043: error = sockopt_getint(sopt, &optval);
! 1044: if (error)
1.153 yamt 1045: break;
1.131 perry 1046:
1.172.2.1! wrstuden 1047: switch(optval) {
1.130 manu 1048: #ifdef IPSEC_NAT_T
1049: case 0:
1050: inp->inp_flags &= ~INP_ESPINUDP_ALL;
1051: break;
1052:
1053: case UDP_ENCAP_ESPINUDP:
1054: inp->inp_flags &= ~INP_ESPINUDP_ALL;
1055: inp->inp_flags |= INP_ESPINUDP;
1056: break;
1.131 perry 1057:
1.130 manu 1058: case UDP_ENCAP_ESPINUDP_NON_IKE:
1059: inp->inp_flags &= ~INP_ESPINUDP_ALL;
1060: inp->inp_flags |= INP_ESPINUDP_NON_IKE;
1061: break;
1062: #endif
1063: default:
1064: error = EINVAL;
1065: break;
1066: }
1067: break;
1068:
1069: default:
1070: error = ENOPROTOOPT;
1071: break;
1072: }
1073: break;
1074:
1075: default:
1076: error = EINVAL;
1077: break;
1.131 perry 1078: }
1079:
1.130 manu 1080: end:
1081: splx(s);
1082: return error;
1083: }
1.131 perry 1084:
1.130 manu 1085:
1086: int
1.27 christos 1087: udp_output(struct mbuf *m, ...)
1088: {
1.66 augustss 1089: struct inpcb *inp;
1090: struct udpiphdr *ui;
1.125 thorpej 1091: struct route *ro;
1.66 augustss 1092: int len = m->m_pkthdr.len;
1.31 mycroft 1093: int error = 0;
1.27 christos 1094: va_list ap;
1095:
1.98 matt 1096: MCLAIM(m, &udp_tx_mowner);
1.27 christos 1097: va_start(ap, m);
1098: inp = va_arg(ap, struct inpcb *);
1099: va_end(ap);
1.1 cgd 1100:
1101: /*
1102: * Calculate data length and get a mbuf
1103: * for UDP and IP headers.
1104: */
1.13 mycroft 1105: M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT);
1106: if (m == 0) {
1107: error = ENOBUFS;
1.39 thorpej 1108: goto release;
1109: }
1110:
1111: /*
1112: * Compute the packet length of the IP header, and
1113: * punt if the length looks bogus.
1114: */
1.96 itojun 1115: if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) {
1.39 thorpej 1116: error = EMSGSIZE;
1.13 mycroft 1117: goto release;
1118: }
1.1 cgd 1119:
1120: /*
1121: * Fill in mbuf with extended UDP header
1122: * and addresses and length put into network format.
1123: */
1124: ui = mtod(m, struct udpiphdr *);
1125: ui->ui_pr = IPPROTO_UDP;
1126: ui->ui_src = inp->inp_laddr;
1127: ui->ui_dst = inp->inp_faddr;
1128: ui->ui_sport = inp->inp_lport;
1129: ui->ui_dport = inp->inp_fport;
1.78 thorpej 1130: ui->ui_ulen = htons((u_int16_t)len + sizeof(struct udphdr));
1.1 cgd 1131:
1.125 thorpej 1132: ro = &inp->inp_route;
1133:
1.1 cgd 1134: /*
1.78 thorpej 1135: * Set up checksum and output datagram.
1.1 cgd 1136: */
1137: if (udpcksum) {
1.78 thorpej 1138: /*
1139: * XXX Cache pseudo-header checksum part for
1140: * XXX "connected" UDP sockets.
1141: */
1142: ui->ui_sum = in_cksum_phdr(ui->ui_src.s_addr,
1143: ui->ui_dst.s_addr, htons((u_int16_t)len +
1144: sizeof(struct udphdr) + IPPROTO_UDP));
1.135 yamt 1145: m->m_pkthdr.csum_flags = M_CSUM_UDPv4;
1.78 thorpej 1146: m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
1147: } else
1148: ui->ui_sum = 0;
1.96 itojun 1149: ((struct ip *)ui)->ip_len = htons(sizeof (struct udpiphdr) + len);
1.1 cgd 1150: ((struct ip *)ui)->ip_ttl = inp->inp_ip.ip_ttl; /* XXX */
1151: ((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; /* XXX */
1.166 thorpej 1152: UDP_STATINC(UDP_STAT_OPACKETS);
1.48 itojun 1153:
1.125 thorpej 1154: return (ip_output(m, inp->inp_options, ro,
1.12 mycroft 1155: inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST),
1.107 itojun 1156: inp->inp_moptions, inp->inp_socket));
1.1 cgd 1157:
1158: release:
1159: m_freem(m);
1160: return (error);
1161: }
1162:
1.42 thorpej 1163: int udp_sendspace = 9216; /* really max datagram size */
1164: int udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in));
1.1 cgd 1165: /* 40 1K datagrams */
1166:
1167: /*ARGSUSED*/
1.7 mycroft 1168: int
1.119 matt 1169: udp_usrreq(struct socket *so, int req, struct mbuf *m, struct mbuf *nam,
1.145 christos 1170: struct mbuf *control, struct lwp *l)
1.1 cgd 1171: {
1.66 augustss 1172: struct inpcb *inp;
1.1 cgd 1173: int s;
1.66 augustss 1174: int error = 0;
1.1 cgd 1175:
1176: if (req == PRU_CONTROL)
1.158 christos 1177: return (in_control(so, (long)m, (void *)nam,
1.148 ad 1178: (struct ifnet *)control, l));
1.59 thorpej 1179:
1.149 tls 1180: s = splsoftnet();
1181:
1.60 thorpej 1182: if (req == PRU_PURGEIF) {
1.170 ad 1183: mutex_enter(softnet_lock);
1.80 itojun 1184: in_pcbpurgeif0(&udbtable, (struct ifnet *)control);
1.60 thorpej 1185: in_purgeif((struct ifnet *)control);
1186: in_pcbpurgeif(&udbtable, (struct ifnet *)control);
1.170 ad 1187: mutex_exit(softnet_lock);
1.149 tls 1188: splx(s);
1.59 thorpej 1189: return (0);
1190: }
1.31 mycroft 1191:
1192: inp = sotoinpcb(so);
1.32 mycroft 1193: #ifdef DIAGNOSTIC
1194: if (req != PRU_SEND && req != PRU_SENDOOB && control)
1195: panic("udp_usrreq: unexpected control mbuf");
1196: #endif
1.170 ad 1197: if (req == PRU_ATTACH) {
1198: sosetlock(so);
1199: } else if (inp == 0) {
1.31 mycroft 1200: error = EINVAL;
1201: goto release;
1202: }
1203:
1.1 cgd 1204: /*
1205: * Note: need to block udp_input while changing
1206: * the udp pcb queue and/or pcb addresses.
1207: */
1208: switch (req) {
1209:
1210: case PRU_ATTACH:
1.31 mycroft 1211: if (inp != 0) {
1212: error = EISCONN;
1.1 cgd 1213: break;
1214: }
1.98 matt 1215: #ifdef MBUFTRACE
1216: so->so_mowner = &udp_mowner;
1217: so->so_rcv.sb_mowner = &udp_rx_mowner;
1218: so->so_snd.sb_mowner = &udp_tx_mowner;
1219: #endif
1.31 mycroft 1220: if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
1221: error = soreserve(so, udp_sendspace, udp_recvspace);
1222: if (error)
1223: break;
1224: }
1.18 mycroft 1225: error = in_pcballoc(so, &udbtable);
1.1 cgd 1226: if (error)
1227: break;
1.31 mycroft 1228: inp = sotoinpcb(so);
1229: inp->inp_ip.ip_ttl = ip_defttl;
1.1 cgd 1230: break;
1231:
1232: case PRU_DETACH:
1.31 mycroft 1233: in_pcbdetach(inp);
1.1 cgd 1234: break;
1235:
1236: case PRU_BIND:
1.148 ad 1237: error = in_pcbbind(inp, nam, l);
1.1 cgd 1238: break;
1239:
1240: case PRU_LISTEN:
1241: error = EOPNOTSUPP;
1242: break;
1243:
1244: case PRU_CONNECT:
1.148 ad 1245: error = in_pcbconnect(inp, nam, l);
1.31 mycroft 1246: if (error)
1.1 cgd 1247: break;
1.31 mycroft 1248: soisconnected(so);
1.1 cgd 1249: break;
1250:
1251: case PRU_CONNECT2:
1252: error = EOPNOTSUPP;
1253: break;
1254:
1255: case PRU_DISCONNECT:
1.31 mycroft 1256: /*soisdisconnected(so);*/
1257: so->so_state &= ~SS_ISCONNECTED; /* XXX */
1.1 cgd 1258: in_pcbdisconnect(inp);
1.34 mycroft 1259: inp->inp_laddr = zeroin_addr; /* XXX */
1.35 mycroft 1260: in_pcbstate(inp, INP_BOUND); /* XXX */
1.1 cgd 1261: break;
1262:
1263: case PRU_SHUTDOWN:
1264: socantsendmore(so);
1265: break;
1266:
1.31 mycroft 1267: case PRU_RCVD:
1268: error = EOPNOTSUPP;
1.1 cgd 1269: break;
1270:
1.31 mycroft 1271: case PRU_SEND:
1.32 mycroft 1272: if (control && control->m_len) {
1273: m_freem(control);
1274: m_freem(m);
1275: error = EINVAL;
1276: break;
1277: }
1.31 mycroft 1278: {
1.35 mycroft 1279: struct in_addr laddr; /* XXX */
1.1 cgd 1280:
1.31 mycroft 1281: if (nam) {
1.35 mycroft 1282: laddr = inp->inp_laddr; /* XXX */
1.31 mycroft 1283: if ((so->so_state & SS_ISCONNECTED) != 0) {
1284: error = EISCONN;
1.32 mycroft 1285: goto die;
1.31 mycroft 1286: }
1.148 ad 1287: error = in_pcbconnect(inp, nam, l);
1.100 matt 1288: if (error)
1289: goto die;
1.31 mycroft 1290: } else {
1291: if ((so->so_state & SS_ISCONNECTED) == 0) {
1292: error = ENOTCONN;
1.32 mycroft 1293: goto die;
1.31 mycroft 1294: }
1295: }
1.33 mycroft 1296: error = udp_output(m, inp);
1.100 matt 1297: m = NULL;
1.31 mycroft 1298: if (nam) {
1299: in_pcbdisconnect(inp);
1.35 mycroft 1300: inp->inp_laddr = laddr; /* XXX */
1301: in_pcbstate(inp, INP_BOUND); /* XXX */
1.31 mycroft 1302: }
1.100 matt 1303: die:
1304: if (m)
1305: m_freem(m);
1.31 mycroft 1306: }
1.1 cgd 1307: break;
1308:
1309: case PRU_SENSE:
1310: /*
1311: * stat: don't bother with a blocksize.
1312: */
1.31 mycroft 1313: splx(s);
1.1 cgd 1314: return (0);
1315:
1.31 mycroft 1316: case PRU_RCVOOB:
1317: error = EOPNOTSUPP;
1318: break;
1319:
1.1 cgd 1320: case PRU_SENDOOB:
1.32 mycroft 1321: m_freem(control);
1.31 mycroft 1322: m_freem(m);
1.1 cgd 1323: error = EOPNOTSUPP;
1324: break;
1325:
1.31 mycroft 1326: case PRU_SOCKADDR:
1327: in_setsockaddr(inp, nam);
1328: break;
1329:
1330: case PRU_PEERADDR:
1331: in_setpeeraddr(inp, nam);
1332: break;
1.1 cgd 1333:
1334: default:
1335: panic("udp_usrreq");
1336: }
1337:
1338: release:
1.31 mycroft 1339: splx(s);
1.1 cgd 1340: return (error);
1.13 mycroft 1341: }
1342:
1.166 thorpej 1343: static int
1344: sysctl_net_inet_udp_stats(SYSCTLFN_ARGS)
1345: {
1346:
1.172 thorpej 1347: return (NETSTAT_SYSCTL(udpstat_percpu, UDP_NSTATS));
1.166 thorpej 1348: }
1349:
1.13 mycroft 1350: /*
1351: * Sysctl for udp variables.
1352: */
1.114 atatat 1353: SYSCTL_SETUP(sysctl_net_inet_udp_setup, "sysctl net.inet.udp subtree setup")
1.13 mycroft 1354: {
1.114 atatat 1355:
1.116 atatat 1356: sysctl_createv(clog, 0, NULL, NULL,
1357: CTLFLAG_PERMANENT,
1.114 atatat 1358: CTLTYPE_NODE, "net", NULL,
1359: NULL, 0, NULL, 0,
1360: CTL_NET, CTL_EOL);
1.116 atatat 1361: sysctl_createv(clog, 0, NULL, NULL,
1362: CTLFLAG_PERMANENT,
1.114 atatat 1363: CTLTYPE_NODE, "inet", NULL,
1364: NULL, 0, NULL, 0,
1365: CTL_NET, PF_INET, CTL_EOL);
1.116 atatat 1366: sysctl_createv(clog, 0, NULL, NULL,
1367: CTLFLAG_PERMANENT,
1.122 atatat 1368: CTLTYPE_NODE, "udp",
1369: SYSCTL_DESCR("UDPv4 related settings"),
1.114 atatat 1370: NULL, 0, NULL, 0,
1371: CTL_NET, PF_INET, IPPROTO_UDP, CTL_EOL);
1372:
1.116 atatat 1373: sysctl_createv(clog, 0, NULL, NULL,
1374: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122 atatat 1375: CTLTYPE_INT, "checksum",
1.123 heas 1376: SYSCTL_DESCR("Compute UDP checksums"),
1.114 atatat 1377: NULL, 0, &udpcksum, 0,
1378: CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_CHECKSUM,
1379: CTL_EOL);
1.116 atatat 1380: sysctl_createv(clog, 0, NULL, NULL,
1381: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122 atatat 1382: CTLTYPE_INT, "sendspace",
1383: SYSCTL_DESCR("Default UDP send buffer size"),
1.114 atatat 1384: NULL, 0, &udp_sendspace, 0,
1385: CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_SENDSPACE,
1386: CTL_EOL);
1.116 atatat 1387: sysctl_createv(clog, 0, NULL, NULL,
1388: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122 atatat 1389: CTLTYPE_INT, "recvspace",
1390: SYSCTL_DESCR("Default UDP receive buffer size"),
1.114 atatat 1391: NULL, 0, &udp_recvspace, 0,
1392: CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_RECVSPACE,
1393: CTL_EOL);
1.125 thorpej 1394: sysctl_createv(clog, 0, NULL, NULL,
1395: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1396: CTLTYPE_INT, "do_loopback_cksum",
1397: SYSCTL_DESCR("Perform UDP checksum on loopback"),
1398: NULL, 0, &udp_do_loopback_cksum, 0,
1399: CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_LOOPBACKCKSUM,
1400: CTL_EOL);
1.132 atatat 1401: sysctl_createv(clog, 0, NULL, NULL,
1402: CTLFLAG_PERMANENT,
1.134 atatat 1403: CTLTYPE_STRUCT, "pcblist",
1.132 atatat 1404: SYSCTL_DESCR("UDP protocol control block list"),
1405: sysctl_inpcblist, 0, &udbtable, 0,
1406: CTL_NET, PF_INET, IPPROTO_UDP, CTL_CREATE,
1407: CTL_EOL);
1.139 elad 1408: sysctl_createv(clog, 0, NULL, NULL,
1409: CTLFLAG_PERMANENT,
1410: CTLTYPE_STRUCT, "stats",
1411: SYSCTL_DESCR("UDP statistics"),
1.166 thorpej 1412: sysctl_net_inet_udp_stats, 0, NULL, 0,
1.139 elad 1413: CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_STATS,
1414: CTL_EOL);
1.1 cgd 1415: }
1.72 itojun 1416: #endif
1.130 manu 1417:
1.166 thorpej 1418: void
1419: udp_statinc(u_int stat)
1420: {
1421:
1422: KASSERT(stat < UDP_NSTATS);
1423: UDP_STATINC(stat);
1424: }
1425:
1.130 manu 1426: #if (defined INET && defined IPSEC_NAT_T)
1427: /*
1428: * Returns:
1429: * 1 if the packet was processed
1430: * 0 if normal UDP processing should take place
1.144 manu 1431: * -1 if an error occurent and m was freed
1.130 manu 1432: */
1433: static int
1.154 yamt 1434: udp4_espinudp(struct mbuf **mp, int off, struct sockaddr *src,
1.151 christos 1435: struct socket *so)
1.130 manu 1436: {
1437: size_t len;
1.158 christos 1438: void *data;
1.130 manu 1439: struct inpcb *inp;
1440: size_t skip = 0;
1441: size_t minlen;
1442: size_t iphdrlen;
1443: struct ip *ip;
1444: struct mbuf *n;
1.136 manu 1445: struct m_tag *tag;
1446: struct udphdr *udphdr;
1447: u_int16_t sport, dport;
1.144 manu 1448: struct mbuf *m = *mp;
1.130 manu 1449:
1.131 perry 1450: /*
1.130 manu 1451: * Collapse the mbuf chain if the first mbuf is too short
1452: * The longest case is: UDP + non ESP marker + ESP
1453: */
1454: minlen = off + sizeof(u_int64_t) + sizeof(struct esp);
1455: if (minlen > m->m_pkthdr.len)
1456: minlen = m->m_pkthdr.len;
1457:
1458: if (m->m_len < minlen) {
1.144 manu 1459: if ((*mp = m_pullup(m, minlen)) == NULL) {
1.130 manu 1460: printf("udp4_espinudp: m_pullup failed\n");
1.144 manu 1461: return -1;
1.130 manu 1462: }
1.144 manu 1463: m = *mp;
1.130 manu 1464: }
1465:
1.131 perry 1466: len = m->m_len - off;
1.158 christos 1467: data = mtod(m, char *) + off;
1.130 manu 1468: inp = sotoinpcb(so);
1469:
1470: /* Ignore keepalive packets */
1.158 christos 1471: if ((len == 1) && (*(unsigned char *)data == 0xff)) {
1.130 manu 1472: return 1;
1473: }
1474:
1.131 perry 1475: /*
1476: * Check that the payload is long enough to hold
1.130 manu 1477: * an ESP header and compute the length of encapsulation
1.131 perry 1478: * header to remove
1.130 manu 1479: */
1480: if (inp->inp_flags & INP_ESPINUDP) {
1481: u_int32_t *st = (u_int32_t *)data;
1482:
1483: if ((len <= sizeof(struct esp)) || (*st == 0))
1484: return 0; /* Normal UDP processing */
1485:
1486: skip = sizeof(struct udphdr);
1487: }
1488:
1489: if (inp->inp_flags & INP_ESPINUDP_NON_IKE) {
1.142 kleink 1490: u_int32_t *st = (u_int32_t *)data;
1.130 manu 1491:
1492: if ((len <= sizeof(u_int64_t) + sizeof(struct esp))
1.142 kleink 1493: || ((st[0] | st[1]) != 0))
1.130 manu 1494: return 0; /* Normal UDP processing */
1.131 perry 1495:
1.130 manu 1496: skip = sizeof(struct udphdr) + sizeof(u_int64_t);
1497: }
1498:
1499: /*
1.136 manu 1500: * Get the UDP ports. They are handled in network
1501: * order everywhere in IPSEC_NAT_T code.
1502: */
1.158 christos 1503: udphdr = (struct udphdr *)((char *)data - skip);
1.136 manu 1504: sport = udphdr->uh_sport;
1505: dport = udphdr->uh_dport;
1506:
1507: /*
1.130 manu 1508: * Remove the UDP header (and possibly the non ESP marker)
1509: * IP header lendth is iphdrlen
1.131 perry 1510: * Before:
1.130 manu 1511: * <--- off --->
1512: * +----+------+-----+
1513: * | IP | UDP | ESP |
1514: * +----+------+-----+
1515: * <-skip->
1516: * After:
1517: * +----+-----+
1518: * | IP | ESP |
1519: * +----+-----+
1520: * <-skip->
1521: */
1522: iphdrlen = off - sizeof(struct udphdr);
1.158 christos 1523: memmove(mtod(m, char *) + skip, mtod(m, void *), iphdrlen);
1.130 manu 1524: m_adj(m, skip);
1525:
1526: ip = mtod(m, struct ip *);
1527: ip->ip_len = htons(ntohs(ip->ip_len) - skip);
1528: ip->ip_p = IPPROTO_ESP;
1529:
1530: /*
1.131 perry 1531: * Copy the mbuf to avoid multiple free, as both
1532: * esp4_input (which we call) and udp_input (which
1.130 manu 1533: * called us) free the mbuf.
1534: */
1535: if ((n = m_dup(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
1536: printf("udp4_espinudp: m_dup failed\n");
1537: return 0;
1538: }
1539:
1.136 manu 1540: /*
1541: * Add a PACKET_TAG_IPSEC_NAT_T_PORT tag to remember
1542: * the source UDP port. This is required if we want
1543: * to select the right SPD for multiple hosts behind
1544: * same NAT
1545: */
1.137 manu 1546: if ((tag = m_tag_get(PACKET_TAG_IPSEC_NAT_T_PORTS,
1547: sizeof(sport) + sizeof(dport), M_DONTWAIT)) == NULL) {
1548: printf("udp4_espinudp: m_tag_get failed\n");
1.138 manu 1549: m_freem(n);
1.137 manu 1550: return 0;
1551: }
1.136 manu 1552: ((u_int16_t *)(tag + 1))[0] = sport;
1553: ((u_int16_t *)(tag + 1))[1] = dport;
1554: m_tag_prepend(n, tag);
1555:
1.147 christos 1556: #ifdef FAST_IPSEC
1.160 degroote 1557: ipsec4_common_input(n, iphdrlen, IPPROTO_ESP);
1.147 christos 1558: #else
1.130 manu 1559: esp4_input(n, iphdrlen);
1.147 christos 1560: #endif
1.130 manu 1561:
1562: /* We handled it, it shoudln't be handled by UDP */
1563: return 1;
1564: }
1565: #endif
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