Annotation of src/sys/netinet/udp_usrreq.c, Revision 1.187
1.187 ! christos 1: /* $NetBSD: udp_usrreq.c,v 1.186 2012/03/22 20:34:39 drochner 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>
1.187 ! christos 64: __KERNEL_RCSID(0, "$NetBSD: udp_usrreq.c,v 1.186 2012/03/22 20:34:39 drochner Exp $");
1.50 thorpej 65:
1.77 soda 66: #include "opt_inet.h"
1.174 christos 67: #include "opt_compat_netbsd.h"
1.50 thorpej 68: #include "opt_ipsec.h"
1.78 thorpej 69: #include "opt_inet_csum.h"
1.64 ws 70: #include "opt_ipkdb.h"
1.101 martin 71: #include "opt_mbuftrace.h"
1.1 cgd 72:
1.5 mycroft 73: #include <sys/param.h>
74: #include <sys/malloc.h>
75: #include <sys/mbuf.h>
76: #include <sys/protosw.h>
77: #include <sys/socket.h>
78: #include <sys/socketvar.h>
1.13 mycroft 79: #include <sys/errno.h>
1.5 mycroft 80: #include <sys/stat.h>
1.27 christos 81: #include <sys/systm.h>
82: #include <sys/proc.h>
1.53 itojun 83: #include <sys/domain.h>
1.27 christos 84: #include <sys/sysctl.h>
1.1 cgd 85:
1.5 mycroft 86: #include <net/if.h>
87: #include <net/route.h>
1.1 cgd 88:
1.5 mycroft 89: #include <netinet/in.h>
90: #include <netinet/in_systm.h>
1.15 cgd 91: #include <netinet/in_var.h>
1.5 mycroft 92: #include <netinet/ip.h>
93: #include <netinet/in_pcb.h>
94: #include <netinet/ip_var.h>
95: #include <netinet/ip_icmp.h>
96: #include <netinet/udp.h>
97: #include <netinet/udp_var.h>
1.166 thorpej 98: #include <netinet/udp_private.h>
1.1 cgd 99:
1.53 itojun 100: #ifdef INET6
101: #include <netinet/ip6.h>
102: #include <netinet/icmp6.h>
103: #include <netinet6/ip6_var.h>
1.167 thorpej 104: #include <netinet6/ip6_private.h>
1.53 itojun 105: #include <netinet6/in6_pcb.h>
106: #include <netinet6/udp6_var.h>
1.168 thorpej 107: #include <netinet6/udp6_private.h>
1.146 rpaulo 108: #include <netinet6/scope6_var.h>
1.53 itojun 109: #endif
110:
111: #ifndef INET6
112: /* always need ip6.h for IP6_EXTHDR_GET */
113: #include <netinet/ip6.h>
114: #endif
115:
1.76 itojun 116: #include "faith.h"
117: #if defined(NFAITH) && NFAITH > 0
118: #include <net/if_faith.h>
119: #endif
120:
1.105 jonathan 121: #ifdef FAST_IPSEC
122: #include <netipsec/ipsec.h>
1.169 thorpej 123: #include <netipsec/ipsec_var.h>
124: #include <netipsec/ipsec_private.h>
1.147 christos 125: #include <netipsec/esp.h>
1.105 jonathan 126: #ifdef INET6
127: #include <netipsec/ipsec6.h>
128: #endif
1.169 thorpej 129: #endif /* FAST_IPSEC */
1.105 jonathan 130:
1.174 christos 131: #ifdef COMPAT_50
132: #include <compat/sys/socket.h>
133: #endif
134:
1.64 ws 135: #ifdef IPKDB
136: #include <ipkdb/ipkdb.h>
137: #endif
138:
1.8 mycroft 139: /*
140: * UDP protocol implementation.
141: * Per RFC 768, August, 1980.
142: */
143: int udpcksum = 1;
1.141 yamt 144: int udp_do_loopback_cksum = 0;
1.93 matt 145:
146: struct inpcbtable udbtable;
1.164 thorpej 147:
1.166 thorpej 148: percpu_t *udpstat_percpu;
1.8 mycroft 149:
1.72 itojun 150: #ifdef INET
1.130 manu 151: #ifdef IPSEC_NAT_T
1.144 manu 152: static int udp4_espinudp (struct mbuf **, int, struct sockaddr *,
1.130 manu 153: struct socket *);
154: #endif
1.119 matt 155: static void udp4_sendup (struct mbuf *, int, struct sockaddr *,
156: struct socket *);
157: static int udp4_realinput (struct sockaddr_in *, struct sockaddr_in *,
1.144 manu 158: struct mbuf **, int);
1.129 yamt 159: static int udp4_input_checksum(struct mbuf *, const struct udphdr *, int, int);
1.72 itojun 160: #endif
1.53 itojun 161: #ifdef INET6
1.119 matt 162: static void udp6_sendup (struct mbuf *, int, struct sockaddr *,
163: struct socket *);
164: static int udp6_realinput (int, struct sockaddr_in6 *,
165: struct sockaddr_in6 *, struct mbuf *, int);
1.129 yamt 166: static int udp6_input_checksum(struct mbuf *, const struct udphdr *, int, int);
1.53 itojun 167: #endif
1.72 itojun 168: #ifdef INET
1.119 matt 169: static void udp_notify (struct inpcb *, int);
1.72 itojun 170: #endif
1.7 mycroft 171:
1.26 mycroft 172: #ifndef UDBHASHSIZE
173: #define UDBHASHSIZE 128
174: #endif
175: int udbhashsize = UDBHASHSIZE;
176:
1.98 matt 177: #ifdef MBUFTRACE
1.150 dogcow 178: struct mowner udp_mowner = MOWNER_INIT("udp", "");
179: struct mowner udp_rx_mowner = MOWNER_INIT("udp", "rx");
180: struct mowner udp_tx_mowner = MOWNER_INIT("udp", "tx");
1.98 matt 181: #endif
182:
1.78 thorpej 183: #ifdef UDP_CSUM_COUNTERS
184: #include <sys/device.h>
185:
1.140 yamt 186: #if defined(INET)
1.78 thorpej 187: struct evcnt udp_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
188: NULL, "udp", "hwcsum bad");
189: struct evcnt udp_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
190: NULL, "udp", "hwcsum ok");
191: struct evcnt udp_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
192: NULL, "udp", "hwcsum data");
193: struct evcnt udp_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
194: NULL, "udp", "swcsum");
195:
1.120 matt 196: EVCNT_ATTACH_STATIC(udp_hwcsum_bad);
197: EVCNT_ATTACH_STATIC(udp_hwcsum_ok);
198: EVCNT_ATTACH_STATIC(udp_hwcsum_data);
199: EVCNT_ATTACH_STATIC(udp_swcsum);
1.140 yamt 200: #endif /* defined(INET) */
201:
202: #if defined(INET6)
203: struct evcnt udp6_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
204: NULL, "udp6", "hwcsum bad");
205: struct evcnt udp6_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
206: NULL, "udp6", "hwcsum ok");
207: struct evcnt udp6_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
208: NULL, "udp6", "hwcsum data");
209: struct evcnt udp6_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
210: NULL, "udp6", "swcsum");
211:
212: EVCNT_ATTACH_STATIC(udp6_hwcsum_bad);
213: EVCNT_ATTACH_STATIC(udp6_hwcsum_ok);
214: EVCNT_ATTACH_STATIC(udp6_hwcsum_data);
215: EVCNT_ATTACH_STATIC(udp6_swcsum);
216: #endif /* defined(INET6) */
217:
218: #define UDP_CSUM_COUNTER_INCR(ev) (ev)->ev_count++
1.120 matt 219:
1.78 thorpej 220: #else
221:
222: #define UDP_CSUM_COUNTER_INCR(ev) /* nothing */
223:
224: #endif /* UDP_CSUM_COUNTERS */
225:
1.179 pooka 226: static void sysctl_net_inet_udp_setup(struct sysctllog **);
227:
1.7 mycroft 228: void
1.119 matt 229: udp_init(void)
1.1 cgd 230: {
1.18 mycroft 231:
1.179 pooka 232: sysctl_net_inet_udp_setup(NULL);
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:
1.175 cegger 411: memset(&src6, 0, sizeof(src6));
1.53 itojun 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;
1.177 tsutsui 415: memcpy(&src6.sin6_addr.s6_addr[12], &ip->ip_src,
1.53 itojun 416: sizeof(ip->ip_src));
417: src6.sin6_port = uh->uh_sport;
1.175 cegger 418: memset(&dst6, 0, sizeof(dst6));
1.53 itojun 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;
1.177 tsutsui 422: memcpy(&dst6.sin6_addr.s6_addr[12], &ip->ip_dst,
1.53 itojun 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: */
1.175 cegger 578: memset(&src, 0, sizeof(src));
1.53 itojun 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;
1.175 cegger 583: memset(&dst, 0, sizeof(dst));
1.53 itojun 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:
1.186 drochner 629: #if 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
1.174 christos 642: #ifdef SO_OTIMESTAMP
643: || so->so_options & SO_OTIMESTAMP
644: #endif
1.53 itojun 645: || so->so_options & SO_TIMESTAMP)) {
646: struct ip *ip = mtod(n, struct ip *);
647: ip_savecontrol(inp, &opts, ip, n);
648: }
649:
650: m_adj(n, off);
651: if (sbappendaddr(&so->so_rcv, src, n,
652: opts) == 0) {
653: m_freem(n);
654: if (opts)
655: m_freem(opts);
1.124 darrenr 656: so->so_rcv.sb_overflowed++;
1.166 thorpej 657: UDP_STATINC(UDP_STAT_FULLSOCK);
1.53 itojun 658: } else
659: sorwakeup(so);
660: }
661: }
1.72 itojun 662: #endif
1.53 itojun 663:
664: #ifdef INET6
665: static void
1.119 matt 666: udp6_sendup(struct mbuf *m, int off /* offset of data portion */,
667: struct sockaddr *src, struct socket *so)
1.53 itojun 668: {
669: struct mbuf *opts = NULL;
670: struct mbuf *n;
671: struct in6pcb *in6p = NULL;
672:
673: if (!so)
674: return;
675: if (so->so_proto->pr_domain->dom_family != AF_INET6)
676: return;
677: in6p = sotoin6pcb(so);
678:
1.186 drochner 679: #if defined(FAST_IPSEC)
1.53 itojun 680: /* check AH/ESP integrity. */
681: if (so != NULL && ipsec6_in_reject_so(m, so)) {
1.169 thorpej 682: IPSEC6_STATINC(IPSEC_STAT_IN_POLVIO);
1.162 dyoung 683: if ((n = m_copypacket(m, M_DONTWAIT)) != NULL)
1.110 itojun 684: icmp6_error(n, ICMP6_DST_UNREACH,
685: ICMP6_DST_UNREACH_ADMIN, 0);
1.53 itojun 686: return;
687: }
688: #endif /*IPSEC*/
689:
1.162 dyoung 690: if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) {
1.53 itojun 691: if (in6p && (in6p->in6p_flags & IN6P_CONTROLOPTS
1.174 christos 692: #ifdef SO_OTIMESTAMP
693: || in6p->in6p_socket->so_options & SO_OTIMESTAMP
694: #endif
695: || in6p->in6p_socket->so_options & SO_TIMESTAMP)) {
1.53 itojun 696: struct ip6_hdr *ip6 = mtod(n, struct ip6_hdr *);
697: ip6_savecontrol(in6p, &opts, ip6, n);
698: }
699:
700: m_adj(n, off);
701: if (sbappendaddr(&so->so_rcv, src, n, opts) == 0) {
702: m_freem(n);
703: if (opts)
704: m_freem(opts);
1.124 darrenr 705: so->so_rcv.sb_overflowed++;
1.168 thorpej 706: UDP6_STATINC(UDP6_STAT_FULLSOCK);
1.53 itojun 707: } else
708: sorwakeup(so);
709: }
710: }
711: #endif
712:
1.72 itojun 713: #ifdef INET
1.53 itojun 714: static int
1.119 matt 715: udp4_realinput(struct sockaddr_in *src, struct sockaddr_in *dst,
1.144 manu 716: struct mbuf **mp, int off /* offset of udphdr */)
1.53 itojun 717: {
718: u_int16_t *sport, *dport;
719: int rcvcnt;
720: struct in_addr *src4, *dst4;
1.109 itojun 721: struct inpcb_hdr *inph;
1.53 itojun 722: struct inpcb *inp;
1.144 manu 723: struct mbuf *m = *mp;
1.53 itojun 724:
725: rcvcnt = 0;
726: off += sizeof(struct udphdr); /* now, offset of payload */
727:
728: if (src->sin_family != AF_INET || dst->sin_family != AF_INET)
729: goto bad;
730:
731: src4 = &src->sin_addr;
732: sport = &src->sin_port;
733: dst4 = &dst->sin_addr;
734: dport = &dst->sin_port;
735:
1.73 itojun 736: if (IN_MULTICAST(dst4->s_addr) ||
1.53 itojun 737: in_broadcast(*dst4, m->m_pkthdr.rcvif)) {
738: /*
739: * Deliver a multicast or broadcast datagram to *all* sockets
740: * for which the local and remote addresses and ports match
741: * those of the incoming datagram. This allows more than
742: * one process to receive multi/broadcasts on the same port.
743: * (This really ought to be done for unicast datagrams as
744: * well, but that would cause problems with existing
745: * applications that open both address-specific sockets and
746: * a wildcard socket listening to the same port -- they would
747: * end up receiving duplicates of every unicast datagram.
748: * Those applications open the multiple sockets to overcome an
749: * inadequacy of the UDP socket interface, but for backwards
750: * compatibility we avoid the problem here rather than
751: * fixing the interface. Maybe 4.5BSD will remedy this?)
752: */
753:
754: /*
1.92 itojun 755: * KAME note: traditionally we dropped udpiphdr from mbuf here.
1.71 itojun 756: * we need udpiphdr for IPsec processing so we do that later.
1.53 itojun 757: */
758: /*
759: * Locate pcb(s) for datagram.
760: */
1.109 itojun 761: CIRCLEQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) {
762: inp = (struct inpcb *)inph;
763: if (inp->inp_af != AF_INET)
764: continue;
765:
1.53 itojun 766: if (inp->inp_lport != *dport)
767: continue;
768: if (!in_nullhost(inp->inp_laddr)) {
769: if (!in_hosteq(inp->inp_laddr, *dst4))
770: continue;
771: }
772: if (!in_nullhost(inp->inp_faddr)) {
773: if (!in_hosteq(inp->inp_faddr, *src4) ||
774: inp->inp_fport != *sport)
775: continue;
776: }
777:
778: udp4_sendup(m, off, (struct sockaddr *)src,
779: inp->inp_socket);
780: rcvcnt++;
781:
782: /*
783: * Don't look for additional matches if this one does
784: * not have either the SO_REUSEPORT or SO_REUSEADDR
785: * socket options set. This heuristic avoids searching
786: * through all pcbs in the common case of a non-shared
787: * port. It assumes that an application will never
788: * clear these options after setting them.
789: */
790: if ((inp->inp_socket->so_options &
791: (SO_REUSEPORT|SO_REUSEADDR)) == 0)
792: break;
793: }
794: } else {
795: /*
796: * Locate pcb for datagram.
797: */
1.180 dyoung 798: inp = in_pcblookup_connect(&udbtable, *src4, *sport, *dst4,
799: *dport, 0);
1.53 itojun 800: if (inp == 0) {
1.166 thorpej 801: UDP_STATINC(UDP_STAT_PCBHASHMISS);
1.53 itojun 802: inp = in_pcblookup_bind(&udbtable, *dst4, *dport);
1.82 itojun 803: if (inp == 0)
1.53 itojun 804: return rcvcnt;
805: }
806:
1.130 manu 807: #ifdef IPSEC_NAT_T
808: /* Handle ESP over UDP */
809: if (inp->inp_flags & INP_ESPINUDP_ALL) {
810: struct sockaddr *sa = (struct sockaddr *)src;
811:
1.144 manu 812: switch(udp4_espinudp(mp, off, sa, inp->inp_socket)) {
813: case -1: /* Error, m was freeed */
814: rcvcnt = -1;
815: goto bad;
816: break;
817:
818: case 1: /* ESP over UDP */
1.130 manu 819: rcvcnt++;
820: goto bad;
1.144 manu 821: break;
822:
823: case 0: /* plain UDP */
824: default: /* Unexpected */
825: /*
826: * Normal UDP processing will take place
827: * m may have changed.
828: */
829: m = *mp;
830: break;
1.130 manu 831: }
832: }
833: #endif
834:
1.178 minskim 835: /*
836: * Check the minimum TTL for socket.
837: */
838: if (mtod(m, struct ip *)->ip_ttl < inp->inp_ip_minttl)
839: goto bad;
840:
1.53 itojun 841: udp4_sendup(m, off, (struct sockaddr *)src, inp->inp_socket);
842: rcvcnt++;
843: }
844:
845: bad:
846: return rcvcnt;
847: }
1.72 itojun 848: #endif
1.53 itojun 849:
850: #ifdef INET6
851: static int
1.119 matt 852: udp6_realinput(int af, struct sockaddr_in6 *src, struct sockaddr_in6 *dst,
853: struct mbuf *m, int off)
1.53 itojun 854: {
1.79 itojun 855: u_int16_t sport, dport;
1.53 itojun 856: int rcvcnt;
1.146 rpaulo 857: struct in6_addr src6, *dst6;
1.79 itojun 858: const struct in_addr *dst4;
1.109 itojun 859: struct inpcb_hdr *inph;
1.53 itojun 860: struct in6pcb *in6p;
861:
862: rcvcnt = 0;
863: off += sizeof(struct udphdr); /* now, offset of payload */
864:
865: if (af != AF_INET && af != AF_INET6)
866: goto bad;
867: if (src->sin6_family != AF_INET6 || dst->sin6_family != AF_INET6)
868: goto bad;
869:
1.146 rpaulo 870: src6 = src->sin6_addr;
871: if (sa6_recoverscope(src) != 0) {
872: /* XXX: should be impossible. */
873: goto bad;
874: }
1.79 itojun 875: sport = src->sin6_port;
1.146 rpaulo 876:
1.79 itojun 877: dport = dst->sin6_port;
1.88 itojun 878: dst4 = (struct in_addr *)&dst->sin6_addr.s6_addr[12];
1.146 rpaulo 879: dst6 = &dst->sin6_addr;
1.53 itojun 880:
1.146 rpaulo 881: if (IN6_IS_ADDR_MULTICAST(dst6) ||
1.79 itojun 882: (af == AF_INET && IN_MULTICAST(dst4->s_addr))) {
1.53 itojun 883: /*
884: * Deliver a multicast or broadcast datagram to *all* sockets
885: * for which the local and remote addresses and ports match
886: * those of the incoming datagram. This allows more than
887: * one process to receive multi/broadcasts on the same port.
888: * (This really ought to be done for unicast datagrams as
889: * well, but that would cause problems with existing
890: * applications that open both address-specific sockets and
891: * a wildcard socket listening to the same port -- they would
892: * end up receiving duplicates of every unicast datagram.
893: * Those applications open the multiple sockets to overcome an
894: * inadequacy of the UDP socket interface, but for backwards
895: * compatibility we avoid the problem here rather than
896: * fixing the interface. Maybe 4.5BSD will remedy this?)
897: */
898:
899: /*
1.92 itojun 900: * KAME note: traditionally we dropped udpiphdr from mbuf here.
1.71 itojun 901: * we need udpiphdr for IPsec processing so we do that later.
1.53 itojun 902: */
903: /*
904: * Locate pcb(s) for datagram.
905: */
1.109 itojun 906: CIRCLEQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) {
907: in6p = (struct in6pcb *)inph;
908: if (in6p->in6p_af != AF_INET6)
909: continue;
910:
1.79 itojun 911: if (in6p->in6p_lport != dport)
1.53 itojun 912: continue;
913: if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
1.146 rpaulo 914: if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr,
915: dst6))
1.53 itojun 916: continue;
1.92 itojun 917: } else {
1.146 rpaulo 918: if (IN6_IS_ADDR_V4MAPPED(dst6) &&
1.85 itojun 919: (in6p->in6p_flags & IN6P_IPV6_V6ONLY))
1.55 itojun 920: continue;
921: }
1.53 itojun 922: if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
1.79 itojun 923: if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr,
924: &src6) || in6p->in6p_fport != sport)
1.53 itojun 925: continue;
1.92 itojun 926: } else {
1.79 itojun 927: if (IN6_IS_ADDR_V4MAPPED(&src6) &&
1.85 itojun 928: (in6p->in6p_flags & IN6P_IPV6_V6ONLY))
1.55 itojun 929: continue;
930: }
1.53 itojun 931:
932: udp6_sendup(m, off, (struct sockaddr *)src,
933: in6p->in6p_socket);
934: rcvcnt++;
935:
936: /*
937: * Don't look for additional matches if this one does
938: * not have either the SO_REUSEPORT or SO_REUSEADDR
939: * socket options set. This heuristic avoids searching
940: * through all pcbs in the common case of a non-shared
941: * port. It assumes that an application will never
942: * clear these options after setting them.
943: */
944: if ((in6p->in6p_socket->so_options &
945: (SO_REUSEPORT|SO_REUSEADDR)) == 0)
946: break;
947: }
948: } else {
949: /*
950: * Locate pcb for datagram.
951: */
1.146 rpaulo 952: in6p = in6_pcblookup_connect(&udbtable, &src6, sport, dst6,
1.180 dyoung 953: dport, 0, 0);
1.53 itojun 954: if (in6p == 0) {
1.166 thorpej 955: UDP_STATINC(UDP_STAT_PCBHASHMISS);
1.146 rpaulo 956: in6p = in6_pcblookup_bind(&udbtable, dst6, dport, 0);
1.82 itojun 957: if (in6p == 0)
1.53 itojun 958: return rcvcnt;
959: }
960:
961: udp6_sendup(m, off, (struct sockaddr *)src, in6p->in6p_socket);
962: rcvcnt++;
963: }
964:
965: bad:
966: return rcvcnt;
967: }
968: #endif
1.1 cgd 969:
1.72 itojun 970: #ifdef INET
1.1 cgd 971: /*
972: * Notify a udp user of an asynchronous error;
973: * just wake up so that he can collect error status.
974: */
1.7 mycroft 975: static void
1.119 matt 976: udp_notify(struct inpcb *inp, int errno)
1.1 cgd 977: {
978: inp->inp_socket->so_error = errno;
979: sorwakeup(inp->inp_socket);
980: sowwakeup(inp->inp_socket);
981: }
982:
1.27 christos 983: void *
1.157 dyoung 984: udp_ctlinput(int cmd, const struct sockaddr *sa, void *v)
1.1 cgd 985: {
1.66 augustss 986: struct ip *ip = v;
987: struct udphdr *uh;
1.119 matt 988: void (*notify)(struct inpcb *, int) = udp_notify;
1.21 mycroft 989: int errno;
1.1 cgd 990:
1.53 itojun 991: if (sa->sa_family != AF_INET
992: || sa->sa_len != sizeof(struct sockaddr_in))
1.51 itojun 993: return NULL;
1.20 mycroft 994: if ((unsigned)cmd >= PRC_NCMDS)
1.27 christos 995: return NULL;
1.20 mycroft 996: errno = inetctlerrmap[cmd];
1.18 mycroft 997: if (PRC_IS_REDIRECT(cmd))
1.19 mycroft 998: notify = in_rtchange, ip = 0;
1.18 mycroft 999: else if (cmd == PRC_HOSTDEAD)
1.19 mycroft 1000: ip = 0;
1.23 cgd 1001: else if (errno == 0)
1.27 christos 1002: return NULL;
1.19 mycroft 1003: if (ip) {
1.158 christos 1004: uh = (struct udphdr *)((char *)ip + (ip->ip_hl << 2));
1.157 dyoung 1005: in_pcbnotify(&udbtable, satocsin(sa)->sin_addr, uh->uh_dport,
1.34 mycroft 1006: ip->ip_src, uh->uh_sport, errno, notify);
1.53 itojun 1007:
1008: /* XXX mapped address case */
1.19 mycroft 1009: } else
1.157 dyoung 1010: in_pcbnotifyall(&udbtable, satocsin(sa)->sin_addr, errno,
1.34 mycroft 1011: notify);
1.27 christos 1012: return NULL;
1.1 cgd 1013: }
1014:
1.7 mycroft 1015: int
1.173 plunky 1016: udp_ctloutput(int op, struct socket *so, struct sockopt *sopt)
1.130 manu 1017: {
1018: int s;
1019: int error = 0;
1020: struct inpcb *inp;
1021: int family;
1.173 plunky 1022: int optval;
1.130 manu 1023:
1024: family = so->so_proto->pr_domain->dom_family;
1025:
1026: s = splsoftnet();
1027: switch (family) {
1028: #ifdef INET
1029: case PF_INET:
1.173 plunky 1030: if (sopt->sopt_level != IPPROTO_UDP) {
1031: error = ip_ctloutput(op, so, sopt);
1.130 manu 1032: goto end;
1033: }
1034: break;
1035: #endif
1036: #ifdef INET6
1037: case PF_INET6:
1.173 plunky 1038: if (sopt->sopt_level != IPPROTO_UDP) {
1039: error = ip6_ctloutput(op, so, sopt);
1.130 manu 1040: goto end;
1041: }
1042: break;
1043: #endif
1044: default:
1045: error = EAFNOSUPPORT;
1046: goto end;
1047: }
1048:
1049:
1050: switch (op) {
1051: case PRCO_SETOPT:
1052: inp = sotoinpcb(so);
1053:
1.173 plunky 1054: switch (sopt->sopt_name) {
1.130 manu 1055: case UDP_ENCAP:
1.173 plunky 1056: error = sockopt_getint(sopt, &optval);
1057: if (error)
1.153 yamt 1058: break;
1.131 perry 1059:
1.173 plunky 1060: switch(optval) {
1.130 manu 1061: #ifdef IPSEC_NAT_T
1062: case 0:
1063: inp->inp_flags &= ~INP_ESPINUDP_ALL;
1064: break;
1065:
1066: case UDP_ENCAP_ESPINUDP:
1067: inp->inp_flags &= ~INP_ESPINUDP_ALL;
1068: inp->inp_flags |= INP_ESPINUDP;
1069: break;
1.131 perry 1070:
1.130 manu 1071: case UDP_ENCAP_ESPINUDP_NON_IKE:
1072: inp->inp_flags &= ~INP_ESPINUDP_ALL;
1073: inp->inp_flags |= INP_ESPINUDP_NON_IKE;
1074: break;
1075: #endif
1076: default:
1077: error = EINVAL;
1078: break;
1079: }
1080: break;
1.183 christos 1081:
1.130 manu 1082: default:
1083: error = ENOPROTOOPT;
1084: break;
1085: }
1086: break;
1087:
1088: default:
1089: error = EINVAL;
1090: break;
1.131 perry 1091: }
1092:
1.130 manu 1093: end:
1094: splx(s);
1095: return error;
1096: }
1.131 perry 1097:
1.130 manu 1098:
1099: int
1.27 christos 1100: udp_output(struct mbuf *m, ...)
1101: {
1.66 augustss 1102: struct inpcb *inp;
1103: struct udpiphdr *ui;
1.125 thorpej 1104: struct route *ro;
1.66 augustss 1105: int len = m->m_pkthdr.len;
1.31 mycroft 1106: int error = 0;
1.27 christos 1107: va_list ap;
1108:
1.98 matt 1109: MCLAIM(m, &udp_tx_mowner);
1.27 christos 1110: va_start(ap, m);
1111: inp = va_arg(ap, struct inpcb *);
1112: va_end(ap);
1.1 cgd 1113:
1114: /*
1115: * Calculate data length and get a mbuf
1116: * for UDP and IP headers.
1117: */
1.13 mycroft 1118: M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT);
1119: if (m == 0) {
1120: error = ENOBUFS;
1.39 thorpej 1121: goto release;
1122: }
1123:
1124: /*
1125: * Compute the packet length of the IP header, and
1126: * punt if the length looks bogus.
1127: */
1.96 itojun 1128: if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) {
1.39 thorpej 1129: error = EMSGSIZE;
1.13 mycroft 1130: goto release;
1131: }
1.1 cgd 1132:
1133: /*
1134: * Fill in mbuf with extended UDP header
1135: * and addresses and length put into network format.
1136: */
1137: ui = mtod(m, struct udpiphdr *);
1138: ui->ui_pr = IPPROTO_UDP;
1139: ui->ui_src = inp->inp_laddr;
1140: ui->ui_dst = inp->inp_faddr;
1141: ui->ui_sport = inp->inp_lport;
1142: ui->ui_dport = inp->inp_fport;
1.78 thorpej 1143: ui->ui_ulen = htons((u_int16_t)len + sizeof(struct udphdr));
1.1 cgd 1144:
1.125 thorpej 1145: ro = &inp->inp_route;
1146:
1.1 cgd 1147: /*
1.78 thorpej 1148: * Set up checksum and output datagram.
1.1 cgd 1149: */
1150: if (udpcksum) {
1.78 thorpej 1151: /*
1152: * XXX Cache pseudo-header checksum part for
1153: * XXX "connected" UDP sockets.
1154: */
1155: ui->ui_sum = in_cksum_phdr(ui->ui_src.s_addr,
1156: ui->ui_dst.s_addr, htons((u_int16_t)len +
1157: sizeof(struct udphdr) + IPPROTO_UDP));
1.135 yamt 1158: m->m_pkthdr.csum_flags = M_CSUM_UDPv4;
1.78 thorpej 1159: m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
1160: } else
1161: ui->ui_sum = 0;
1.96 itojun 1162: ((struct ip *)ui)->ip_len = htons(sizeof (struct udpiphdr) + len);
1.1 cgd 1163: ((struct ip *)ui)->ip_ttl = inp->inp_ip.ip_ttl; /* XXX */
1164: ((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; /* XXX */
1.166 thorpej 1165: UDP_STATINC(UDP_STAT_OPACKETS);
1.48 itojun 1166:
1.125 thorpej 1167: return (ip_output(m, inp->inp_options, ro,
1.12 mycroft 1168: inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST),
1.107 itojun 1169: inp->inp_moptions, inp->inp_socket));
1.1 cgd 1170:
1171: release:
1172: m_freem(m);
1173: return (error);
1174: }
1175:
1.42 thorpej 1176: int udp_sendspace = 9216; /* really max datagram size */
1177: int udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in));
1.1 cgd 1178: /* 40 1K datagrams */
1179:
1180: /*ARGSUSED*/
1.7 mycroft 1181: int
1.119 matt 1182: udp_usrreq(struct socket *so, int req, struct mbuf *m, struct mbuf *nam,
1.145 christos 1183: struct mbuf *control, struct lwp *l)
1.1 cgd 1184: {
1.66 augustss 1185: struct inpcb *inp;
1.1 cgd 1186: int s;
1.66 augustss 1187: int error = 0;
1.1 cgd 1188:
1189: if (req == PRU_CONTROL)
1.158 christos 1190: return (in_control(so, (long)m, (void *)nam,
1.148 ad 1191: (struct ifnet *)control, l));
1.59 thorpej 1192:
1.149 tls 1193: s = splsoftnet();
1194:
1.60 thorpej 1195: if (req == PRU_PURGEIF) {
1.170 ad 1196: mutex_enter(softnet_lock);
1.80 itojun 1197: in_pcbpurgeif0(&udbtable, (struct ifnet *)control);
1.60 thorpej 1198: in_purgeif((struct ifnet *)control);
1199: in_pcbpurgeif(&udbtable, (struct ifnet *)control);
1.170 ad 1200: mutex_exit(softnet_lock);
1.149 tls 1201: splx(s);
1.59 thorpej 1202: return (0);
1203: }
1.31 mycroft 1204:
1205: inp = sotoinpcb(so);
1.32 mycroft 1206: #ifdef DIAGNOSTIC
1207: if (req != PRU_SEND && req != PRU_SENDOOB && control)
1208: panic("udp_usrreq: unexpected control mbuf");
1209: #endif
1.170 ad 1210: if (req == PRU_ATTACH) {
1211: sosetlock(so);
1212: } else if (inp == 0) {
1.31 mycroft 1213: error = EINVAL;
1214: goto release;
1215: }
1216:
1.1 cgd 1217: /*
1218: * Note: need to block udp_input while changing
1219: * the udp pcb queue and/or pcb addresses.
1220: */
1221: switch (req) {
1222:
1223: case PRU_ATTACH:
1.31 mycroft 1224: if (inp != 0) {
1225: error = EISCONN;
1.1 cgd 1226: break;
1227: }
1.98 matt 1228: #ifdef MBUFTRACE
1229: so->so_mowner = &udp_mowner;
1230: so->so_rcv.sb_mowner = &udp_rx_mowner;
1231: so->so_snd.sb_mowner = &udp_tx_mowner;
1232: #endif
1.31 mycroft 1233: if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
1234: error = soreserve(so, udp_sendspace, udp_recvspace);
1235: if (error)
1236: break;
1237: }
1.18 mycroft 1238: error = in_pcballoc(so, &udbtable);
1.1 cgd 1239: if (error)
1240: break;
1.31 mycroft 1241: inp = sotoinpcb(so);
1242: inp->inp_ip.ip_ttl = ip_defttl;
1.1 cgd 1243: break;
1244:
1245: case PRU_DETACH:
1.31 mycroft 1246: in_pcbdetach(inp);
1.1 cgd 1247: break;
1248:
1249: case PRU_BIND:
1.148 ad 1250: error = in_pcbbind(inp, nam, l);
1.1 cgd 1251: break;
1252:
1253: case PRU_LISTEN:
1254: error = EOPNOTSUPP;
1255: break;
1256:
1257: case PRU_CONNECT:
1.148 ad 1258: error = in_pcbconnect(inp, nam, l);
1.31 mycroft 1259: if (error)
1.1 cgd 1260: break;
1.31 mycroft 1261: soisconnected(so);
1.1 cgd 1262: break;
1263:
1264: case PRU_CONNECT2:
1265: error = EOPNOTSUPP;
1266: break;
1267:
1268: case PRU_DISCONNECT:
1.31 mycroft 1269: /*soisdisconnected(so);*/
1270: so->so_state &= ~SS_ISCONNECTED; /* XXX */
1.1 cgd 1271: in_pcbdisconnect(inp);
1.34 mycroft 1272: inp->inp_laddr = zeroin_addr; /* XXX */
1.35 mycroft 1273: in_pcbstate(inp, INP_BOUND); /* XXX */
1.1 cgd 1274: break;
1275:
1276: case PRU_SHUTDOWN:
1277: socantsendmore(so);
1278: break;
1279:
1.31 mycroft 1280: case PRU_RCVD:
1281: error = EOPNOTSUPP;
1.1 cgd 1282: break;
1283:
1.31 mycroft 1284: case PRU_SEND:
1.32 mycroft 1285: if (control && control->m_len) {
1286: m_freem(control);
1287: m_freem(m);
1288: error = EINVAL;
1289: break;
1290: }
1.31 mycroft 1291: {
1.35 mycroft 1292: struct in_addr laddr; /* XXX */
1.1 cgd 1293:
1.181 mrg 1294: memset(&laddr, 0, sizeof laddr);
1.31 mycroft 1295: if (nam) {
1.35 mycroft 1296: laddr = inp->inp_laddr; /* XXX */
1.31 mycroft 1297: if ((so->so_state & SS_ISCONNECTED) != 0) {
1298: error = EISCONN;
1.32 mycroft 1299: goto die;
1.31 mycroft 1300: }
1.148 ad 1301: error = in_pcbconnect(inp, nam, l);
1.100 matt 1302: if (error)
1303: goto die;
1.31 mycroft 1304: } else {
1305: if ((so->so_state & SS_ISCONNECTED) == 0) {
1306: error = ENOTCONN;
1.32 mycroft 1307: goto die;
1.31 mycroft 1308: }
1309: }
1.33 mycroft 1310: error = udp_output(m, inp);
1.100 matt 1311: m = NULL;
1.31 mycroft 1312: if (nam) {
1313: in_pcbdisconnect(inp);
1.35 mycroft 1314: inp->inp_laddr = laddr; /* XXX */
1315: in_pcbstate(inp, INP_BOUND); /* XXX */
1.31 mycroft 1316: }
1.100 matt 1317: die:
1318: if (m)
1319: m_freem(m);
1.31 mycroft 1320: }
1.1 cgd 1321: break;
1322:
1323: case PRU_SENSE:
1324: /*
1325: * stat: don't bother with a blocksize.
1326: */
1.31 mycroft 1327: splx(s);
1.1 cgd 1328: return (0);
1329:
1.31 mycroft 1330: case PRU_RCVOOB:
1331: error = EOPNOTSUPP;
1332: break;
1333:
1.1 cgd 1334: case PRU_SENDOOB:
1.32 mycroft 1335: m_freem(control);
1.31 mycroft 1336: m_freem(m);
1.1 cgd 1337: error = EOPNOTSUPP;
1338: break;
1339:
1.31 mycroft 1340: case PRU_SOCKADDR:
1341: in_setsockaddr(inp, nam);
1342: break;
1343:
1344: case PRU_PEERADDR:
1345: in_setpeeraddr(inp, nam);
1346: break;
1.1 cgd 1347:
1348: default:
1349: panic("udp_usrreq");
1350: }
1351:
1352: release:
1.31 mycroft 1353: splx(s);
1.1 cgd 1354: return (error);
1.13 mycroft 1355: }
1356:
1.166 thorpej 1357: static int
1358: sysctl_net_inet_udp_stats(SYSCTLFN_ARGS)
1359: {
1360:
1.172 thorpej 1361: return (NETSTAT_SYSCTL(udpstat_percpu, UDP_NSTATS));
1.166 thorpej 1362: }
1363:
1.13 mycroft 1364: /*
1365: * Sysctl for udp variables.
1366: */
1.179 pooka 1367: static void
1368: sysctl_net_inet_udp_setup(struct sysctllog **clog)
1.13 mycroft 1369: {
1.116 atatat 1370: sysctl_createv(clog, 0, NULL, NULL,
1371: CTLFLAG_PERMANENT,
1.114 atatat 1372: CTLTYPE_NODE, "net", NULL,
1373: NULL, 0, NULL, 0,
1374: CTL_NET, CTL_EOL);
1.116 atatat 1375: sysctl_createv(clog, 0, NULL, NULL,
1376: CTLFLAG_PERMANENT,
1.114 atatat 1377: CTLTYPE_NODE, "inet", NULL,
1378: NULL, 0, NULL, 0,
1379: CTL_NET, PF_INET, CTL_EOL);
1.116 atatat 1380: sysctl_createv(clog, 0, NULL, NULL,
1381: CTLFLAG_PERMANENT,
1.122 atatat 1382: CTLTYPE_NODE, "udp",
1383: SYSCTL_DESCR("UDPv4 related settings"),
1.114 atatat 1384: NULL, 0, NULL, 0,
1385: CTL_NET, PF_INET, IPPROTO_UDP, CTL_EOL);
1386:
1.116 atatat 1387: sysctl_createv(clog, 0, NULL, NULL,
1388: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122 atatat 1389: CTLTYPE_INT, "checksum",
1.123 heas 1390: SYSCTL_DESCR("Compute UDP checksums"),
1.114 atatat 1391: NULL, 0, &udpcksum, 0,
1392: CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_CHECKSUM,
1393: CTL_EOL);
1.116 atatat 1394: sysctl_createv(clog, 0, NULL, NULL,
1395: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122 atatat 1396: CTLTYPE_INT, "sendspace",
1397: SYSCTL_DESCR("Default UDP send buffer size"),
1.114 atatat 1398: NULL, 0, &udp_sendspace, 0,
1399: CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_SENDSPACE,
1400: CTL_EOL);
1.116 atatat 1401: sysctl_createv(clog, 0, NULL, NULL,
1402: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122 atatat 1403: CTLTYPE_INT, "recvspace",
1404: SYSCTL_DESCR("Default UDP receive buffer size"),
1.114 atatat 1405: NULL, 0, &udp_recvspace, 0,
1406: CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_RECVSPACE,
1407: CTL_EOL);
1.125 thorpej 1408: sysctl_createv(clog, 0, NULL, NULL,
1409: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1410: CTLTYPE_INT, "do_loopback_cksum",
1411: SYSCTL_DESCR("Perform UDP checksum on loopback"),
1412: NULL, 0, &udp_do_loopback_cksum, 0,
1413: CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_LOOPBACKCKSUM,
1414: CTL_EOL);
1.132 atatat 1415: sysctl_createv(clog, 0, NULL, NULL,
1416: CTLFLAG_PERMANENT,
1.134 atatat 1417: CTLTYPE_STRUCT, "pcblist",
1.132 atatat 1418: SYSCTL_DESCR("UDP protocol control block list"),
1419: sysctl_inpcblist, 0, &udbtable, 0,
1420: CTL_NET, PF_INET, IPPROTO_UDP, CTL_CREATE,
1421: CTL_EOL);
1.139 elad 1422: sysctl_createv(clog, 0, NULL, NULL,
1423: CTLFLAG_PERMANENT,
1424: CTLTYPE_STRUCT, "stats",
1425: SYSCTL_DESCR("UDP statistics"),
1.166 thorpej 1426: sysctl_net_inet_udp_stats, 0, NULL, 0,
1.139 elad 1427: CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_STATS,
1428: CTL_EOL);
1.1 cgd 1429: }
1.72 itojun 1430: #endif
1.130 manu 1431:
1.166 thorpej 1432: void
1433: udp_statinc(u_int stat)
1434: {
1435:
1436: KASSERT(stat < UDP_NSTATS);
1437: UDP_STATINC(stat);
1438: }
1439:
1.130 manu 1440: #if (defined INET && defined IPSEC_NAT_T)
1441: /*
1442: * Returns:
1443: * 1 if the packet was processed
1444: * 0 if normal UDP processing should take place
1.144 manu 1445: * -1 if an error occurent and m was freed
1.130 manu 1446: */
1447: static int
1.154 yamt 1448: udp4_espinudp(struct mbuf **mp, int off, struct sockaddr *src,
1.151 christos 1449: struct socket *so)
1.130 manu 1450: {
1451: size_t len;
1.158 christos 1452: void *data;
1.130 manu 1453: struct inpcb *inp;
1454: size_t skip = 0;
1455: size_t minlen;
1456: size_t iphdrlen;
1457: struct ip *ip;
1458: struct mbuf *n;
1.136 manu 1459: struct m_tag *tag;
1460: struct udphdr *udphdr;
1461: u_int16_t sport, dport;
1.144 manu 1462: struct mbuf *m = *mp;
1.130 manu 1463:
1.131 perry 1464: /*
1.130 manu 1465: * Collapse the mbuf chain if the first mbuf is too short
1466: * The longest case is: UDP + non ESP marker + ESP
1467: */
1468: minlen = off + sizeof(u_int64_t) + sizeof(struct esp);
1469: if (minlen > m->m_pkthdr.len)
1470: minlen = m->m_pkthdr.len;
1471:
1472: if (m->m_len < minlen) {
1.144 manu 1473: if ((*mp = m_pullup(m, minlen)) == NULL) {
1.130 manu 1474: printf("udp4_espinudp: m_pullup failed\n");
1.144 manu 1475: return -1;
1.130 manu 1476: }
1.144 manu 1477: m = *mp;
1.130 manu 1478: }
1479:
1.131 perry 1480: len = m->m_len - off;
1.158 christos 1481: data = mtod(m, char *) + off;
1.130 manu 1482: inp = sotoinpcb(so);
1483:
1484: /* Ignore keepalive packets */
1.158 christos 1485: if ((len == 1) && (*(unsigned char *)data == 0xff)) {
1.130 manu 1486: return 1;
1487: }
1488:
1.131 perry 1489: /*
1490: * Check that the payload is long enough to hold
1.130 manu 1491: * an ESP header and compute the length of encapsulation
1.131 perry 1492: * header to remove
1.130 manu 1493: */
1494: if (inp->inp_flags & INP_ESPINUDP) {
1495: u_int32_t *st = (u_int32_t *)data;
1496:
1497: if ((len <= sizeof(struct esp)) || (*st == 0))
1498: return 0; /* Normal UDP processing */
1499:
1500: skip = sizeof(struct udphdr);
1501: }
1502:
1503: if (inp->inp_flags & INP_ESPINUDP_NON_IKE) {
1.142 kleink 1504: u_int32_t *st = (u_int32_t *)data;
1.130 manu 1505:
1506: if ((len <= sizeof(u_int64_t) + sizeof(struct esp))
1.142 kleink 1507: || ((st[0] | st[1]) != 0))
1.130 manu 1508: return 0; /* Normal UDP processing */
1.131 perry 1509:
1.130 manu 1510: skip = sizeof(struct udphdr) + sizeof(u_int64_t);
1511: }
1512:
1513: /*
1.136 manu 1514: * Get the UDP ports. They are handled in network
1515: * order everywhere in IPSEC_NAT_T code.
1516: */
1.158 christos 1517: udphdr = (struct udphdr *)((char *)data - skip);
1.136 manu 1518: sport = udphdr->uh_sport;
1519: dport = udphdr->uh_dport;
1520:
1521: /*
1.130 manu 1522: * Remove the UDP header (and possibly the non ESP marker)
1523: * IP header lendth is iphdrlen
1.131 perry 1524: * Before:
1.130 manu 1525: * <--- off --->
1526: * +----+------+-----+
1527: * | IP | UDP | ESP |
1528: * +----+------+-----+
1529: * <-skip->
1530: * After:
1531: * +----+-----+
1532: * | IP | ESP |
1533: * +----+-----+
1534: * <-skip->
1535: */
1536: iphdrlen = off - sizeof(struct udphdr);
1.158 christos 1537: memmove(mtod(m, char *) + skip, mtod(m, void *), iphdrlen);
1.130 manu 1538: m_adj(m, skip);
1539:
1540: ip = mtod(m, struct ip *);
1541: ip->ip_len = htons(ntohs(ip->ip_len) - skip);
1542: ip->ip_p = IPPROTO_ESP;
1543:
1544: /*
1.131 perry 1545: * Copy the mbuf to avoid multiple free, as both
1546: * esp4_input (which we call) and udp_input (which
1.130 manu 1547: * called us) free the mbuf.
1548: */
1549: if ((n = m_dup(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
1550: printf("udp4_espinudp: m_dup failed\n");
1551: return 0;
1552: }
1553:
1.136 manu 1554: /*
1555: * Add a PACKET_TAG_IPSEC_NAT_T_PORT tag to remember
1556: * the source UDP port. This is required if we want
1557: * to select the right SPD for multiple hosts behind
1558: * same NAT
1559: */
1.137 manu 1560: if ((tag = m_tag_get(PACKET_TAG_IPSEC_NAT_T_PORTS,
1561: sizeof(sport) + sizeof(dport), M_DONTWAIT)) == NULL) {
1562: printf("udp4_espinudp: m_tag_get failed\n");
1.138 manu 1563: m_freem(n);
1.137 manu 1564: return 0;
1565: }
1.136 manu 1566: ((u_int16_t *)(tag + 1))[0] = sport;
1567: ((u_int16_t *)(tag + 1))[1] = dport;
1568: m_tag_prepend(n, tag);
1569:
1.147 christos 1570: #ifdef FAST_IPSEC
1.160 degroote 1571: ipsec4_common_input(n, iphdrlen, IPPROTO_ESP);
1.147 christos 1572: #else
1.130 manu 1573: esp4_input(n, iphdrlen);
1.147 christos 1574: #endif
1.130 manu 1575:
1.185 liamjfoy 1576: /* We handled it, it shouldn't be handled by UDP */
1.130 manu 1577: return 1;
1578: }
1579: #endif
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