Annotation of src/sys/netinet/udp_usrreq.c, Revision 1.171.2.4
1.171.2.4! yamt 1: /* $NetBSD: udp_usrreq.c,v 1.171.2.3 2009/08/19 18:48:25 yamt Exp $ */
1.48 itojun 2:
3: /*
4: * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
5: * All rights reserved.
1.94 itojun 6: *
1.48 itojun 7: * Redistribution and use in source and binary forms, with or without
8: * modification, are permitted provided that the following conditions
9: * are met:
10: * 1. Redistributions of source code must retain the above copyright
11: * notice, this list of conditions and the following disclaimer.
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in the
14: * documentation and/or other materials provided with the distribution.
15: * 3. Neither the name of the project nor the names of its contributors
16: * may be used to endorse or promote products derived from this software
17: * without specific prior written permission.
1.94 itojun 18: *
1.48 itojun 19: * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
20: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22: * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
23: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29: * SUCH DAMAGE.
30: */
1.14 cgd 31:
1.1 cgd 32: /*
1.44 thorpej 33: * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995
1.13 mycroft 34: * The Regents of the University of California. All rights reserved.
1.1 cgd 35: *
36: * Redistribution and use in source and binary forms, with or without
37: * modification, are permitted provided that the following conditions
38: * are met:
39: * 1. Redistributions of source code must retain the above copyright
40: * notice, this list of conditions and the following disclaimer.
41: * 2. Redistributions in binary form must reproduce the above copyright
42: * notice, this list of conditions and the following disclaimer in the
43: * documentation and/or other materials provided with the distribution.
1.104 agc 44: * 3. Neither the name of the University nor the names of its contributors
1.1 cgd 45: * may be used to endorse or promote products derived from this software
46: * without specific prior written permission.
47: *
48: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
49: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
50: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
51: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
52: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
53: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
54: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
55: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
56: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
57: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
58: * SUCH DAMAGE.
59: *
1.44 thorpej 60: * @(#)udp_usrreq.c 8.6 (Berkeley) 5/23/95
1.1 cgd 61: */
1.91 lukem 62:
63: #include <sys/cdefs.h>
1.171.2.4! yamt 64: __KERNEL_RCSID(0, "$NetBSD: udp_usrreq.c,v 1.171.2.3 2009/08/19 18:48:25 yamt Exp $");
1.50 thorpej 65:
1.77 soda 66: #include "opt_inet.h"
1.171.2.2 yamt 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:
1.27 christos 121: #include <machine/stdarg.h>
122:
1.105 jonathan 123: #ifdef FAST_IPSEC
124: #include <netipsec/ipsec.h>
1.169 thorpej 125: #include <netipsec/ipsec_var.h>
126: #include <netipsec/ipsec_private.h>
1.147 christos 127: #include <netipsec/esp.h>
1.105 jonathan 128: #ifdef INET6
129: #include <netipsec/ipsec6.h>
130: #endif
1.169 thorpej 131: #endif /* FAST_IPSEC */
1.105 jonathan 132:
1.48 itojun 133: #ifdef IPSEC
134: #include <netinet6/ipsec.h>
1.169 thorpej 135: #include <netinet6/ipsec_private.h>
1.147 christos 136: #include <netinet6/esp.h>
1.48 itojun 137: #include <netkey/key.h>
1.169 thorpej 138: #endif /* IPSEC */
1.48 itojun 139:
1.171.2.2 yamt 140: #ifdef COMPAT_50
141: #include <compat/sys/socket.h>
142: #endif
143:
1.64 ws 144: #ifdef IPKDB
145: #include <ipkdb/ipkdb.h>
146: #endif
147:
1.8 mycroft 148: /*
149: * UDP protocol implementation.
150: * Per RFC 768, August, 1980.
151: */
152: int udpcksum = 1;
1.141 yamt 153: int udp_do_loopback_cksum = 0;
1.93 matt 154:
155: struct inpcbtable udbtable;
1.164 thorpej 156:
1.166 thorpej 157: percpu_t *udpstat_percpu;
1.8 mycroft 158:
1.72 itojun 159: #ifdef INET
1.130 manu 160: #ifdef IPSEC_NAT_T
1.144 manu 161: static int udp4_espinudp (struct mbuf **, int, struct sockaddr *,
1.130 manu 162: struct socket *);
163: #endif
1.119 matt 164: static void udp4_sendup (struct mbuf *, int, struct sockaddr *,
165: struct socket *);
166: static int udp4_realinput (struct sockaddr_in *, struct sockaddr_in *,
1.144 manu 167: struct mbuf **, int);
1.129 yamt 168: static int udp4_input_checksum(struct mbuf *, const struct udphdr *, int, int);
1.72 itojun 169: #endif
1.53 itojun 170: #ifdef INET6
1.119 matt 171: static void udp6_sendup (struct mbuf *, int, struct sockaddr *,
172: struct socket *);
173: static int udp6_realinput (int, struct sockaddr_in6 *,
174: struct sockaddr_in6 *, struct mbuf *, int);
1.129 yamt 175: static int udp6_input_checksum(struct mbuf *, const struct udphdr *, int, int);
1.53 itojun 176: #endif
1.72 itojun 177: #ifdef INET
1.119 matt 178: static void udp_notify (struct inpcb *, int);
1.72 itojun 179: #endif
1.7 mycroft 180:
1.26 mycroft 181: #ifndef UDBHASHSIZE
182: #define UDBHASHSIZE 128
183: #endif
184: int udbhashsize = UDBHASHSIZE;
185:
1.98 matt 186: #ifdef MBUFTRACE
1.150 dogcow 187: struct mowner udp_mowner = MOWNER_INIT("udp", "");
188: struct mowner udp_rx_mowner = MOWNER_INIT("udp", "rx");
189: struct mowner udp_tx_mowner = MOWNER_INIT("udp", "tx");
1.98 matt 190: #endif
191:
1.78 thorpej 192: #ifdef UDP_CSUM_COUNTERS
193: #include <sys/device.h>
194:
1.140 yamt 195: #if defined(INET)
1.78 thorpej 196: struct evcnt udp_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
197: NULL, "udp", "hwcsum bad");
198: struct evcnt udp_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
199: NULL, "udp", "hwcsum ok");
200: struct evcnt udp_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
201: NULL, "udp", "hwcsum data");
202: struct evcnt udp_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
203: NULL, "udp", "swcsum");
204:
1.120 matt 205: EVCNT_ATTACH_STATIC(udp_hwcsum_bad);
206: EVCNT_ATTACH_STATIC(udp_hwcsum_ok);
207: EVCNT_ATTACH_STATIC(udp_hwcsum_data);
208: EVCNT_ATTACH_STATIC(udp_swcsum);
1.140 yamt 209: #endif /* defined(INET) */
210:
211: #if defined(INET6)
212: struct evcnt udp6_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
213: NULL, "udp6", "hwcsum bad");
214: struct evcnt udp6_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
215: NULL, "udp6", "hwcsum ok");
216: struct evcnt udp6_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
217: NULL, "udp6", "hwcsum data");
218: struct evcnt udp6_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
219: NULL, "udp6", "swcsum");
220:
221: EVCNT_ATTACH_STATIC(udp6_hwcsum_bad);
222: EVCNT_ATTACH_STATIC(udp6_hwcsum_ok);
223: EVCNT_ATTACH_STATIC(udp6_hwcsum_data);
224: EVCNT_ATTACH_STATIC(udp6_swcsum);
225: #endif /* defined(INET6) */
226:
227: #define UDP_CSUM_COUNTER_INCR(ev) (ev)->ev_count++
1.120 matt 228:
1.78 thorpej 229: #else
230:
231: #define UDP_CSUM_COUNTER_INCR(ev) /* nothing */
232:
233: #endif /* UDP_CSUM_COUNTERS */
234:
1.171.2.4! yamt 235: static void sysctl_net_inet_udp_setup(struct sysctllog **);
! 236:
1.7 mycroft 237: void
1.119 matt 238: udp_init(void)
1.1 cgd 239: {
1.18 mycroft 240:
1.171.2.4! yamt 241: sysctl_net_inet_udp_setup(NULL);
! 242:
1.35 mycroft 243: in_pcbinit(&udbtable, udbhashsize, udbhashsize);
1.78 thorpej 244:
1.98 matt 245: MOWNER_ATTACH(&udp_tx_mowner);
246: MOWNER_ATTACH(&udp_rx_mowner);
247: MOWNER_ATTACH(&udp_mowner);
1.166 thorpej 248:
1.171 yamt 249: #ifdef INET
1.166 thorpej 250: udpstat_percpu = percpu_alloc(sizeof(uint64_t) * UDP_NSTATS);
1.171 yamt 251: #endif
252: #ifdef INET6
253: udp6stat_percpu = percpu_alloc(sizeof(uint64_t) * UDP6_NSTATS);
254: #endif
1.1 cgd 255: }
256:
1.129 yamt 257: /*
258: * Checksum extended UDP header and data.
259: */
260:
261: int
262: udp_input_checksum(int af, struct mbuf *m, const struct udphdr *uh,
263: int iphlen, int len)
264: {
265:
266: switch (af) {
1.72 itojun 267: #ifdef INET
1.129 yamt 268: case AF_INET:
269: return udp4_input_checksum(m, uh, iphlen, len);
270: #endif
271: #ifdef INET6
272: case AF_INET6:
273: return udp6_input_checksum(m, uh, iphlen, len);
274: #endif
275: }
276: #ifdef DIAGNOSTIC
277: panic("udp_input_checksum: unknown af %d", af);
278: #endif
279: /* NOTREACHED */
280: return -1;
281: }
282:
283: #ifdef INET
284:
285: /*
286: * Checksum extended UDP header and data.
287: */
288:
289: static int
290: udp4_input_checksum(struct mbuf *m, const struct udphdr *uh,
291: int iphlen, int len)
292: {
293:
294: /*
295: * XXX it's better to record and check if this mbuf is
296: * already checked.
297: */
298:
299: if (uh->uh_sum == 0)
300: return 0;
301:
302: switch (m->m_pkthdr.csum_flags &
303: ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv4) |
304: M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) {
305: case M_CSUM_UDPv4|M_CSUM_TCP_UDP_BAD:
306: UDP_CSUM_COUNTER_INCR(&udp_hwcsum_bad);
307: goto badcsum;
308:
309: case M_CSUM_UDPv4|M_CSUM_DATA: {
310: u_int32_t hw_csum = m->m_pkthdr.csum_data;
311:
312: UDP_CSUM_COUNTER_INCR(&udp_hwcsum_data);
313: if (m->m_pkthdr.csum_flags & M_CSUM_NO_PSEUDOHDR) {
314: const struct ip *ip =
315: mtod(m, const struct ip *);
316:
317: hw_csum = in_cksum_phdr(ip->ip_src.s_addr,
318: ip->ip_dst.s_addr,
319: htons(hw_csum + len + IPPROTO_UDP));
320: }
321: if ((hw_csum ^ 0xffff) != 0)
322: goto badcsum;
323: break;
324: }
325:
326: case M_CSUM_UDPv4:
327: /* Checksum was okay. */
328: UDP_CSUM_COUNTER_INCR(&udp_hwcsum_ok);
329: break;
330:
331: default:
332: /*
333: * Need to compute it ourselves. Maybe skip checksum
334: * on loopback interfaces.
335: */
336: if (__predict_true(!(m->m_pkthdr.rcvif->if_flags &
337: IFF_LOOPBACK) ||
338: udp_do_loopback_cksum)) {
339: UDP_CSUM_COUNTER_INCR(&udp_swcsum);
340: if (in4_cksum(m, IPPROTO_UDP, iphlen, len) != 0)
341: goto badcsum;
342: }
343: break;
344: }
345:
346: return 0;
347:
348: badcsum:
1.166 thorpej 349: UDP_STATINC(UDP_STAT_BADSUM);
1.129 yamt 350: return -1;
351: }
352:
1.7 mycroft 353: void
1.27 christos 354: udp_input(struct mbuf *m, ...)
1.1 cgd 355: {
1.53 itojun 356: va_list ap;
357: struct sockaddr_in src, dst;
358: struct ip *ip;
359: struct udphdr *uh;
1.97 simonb 360: int iphlen;
1.53 itojun 361: int len;
362: int n;
1.96 itojun 363: u_int16_t ip_len;
1.53 itojun 364:
365: va_start(ap, m);
366: iphlen = va_arg(ap, int);
1.97 simonb 367: (void)va_arg(ap, int); /* ignore value, advance ap */
1.53 itojun 368: va_end(ap);
369:
1.98 matt 370: MCLAIM(m, &udp_rx_mowner);
1.166 thorpej 371: UDP_STATINC(UDP_STAT_IPACKETS);
1.53 itojun 372:
373: /*
374: * Get IP and UDP header together in first mbuf.
375: */
376: ip = mtod(m, struct ip *);
377: IP6_EXTHDR_GET(uh, struct udphdr *, m, iphlen, sizeof(struct udphdr));
378: if (uh == NULL) {
1.166 thorpej 379: UDP_STATINC(UDP_STAT_HDROPS);
1.53 itojun 380: return;
381: }
1.95 thorpej 382: KASSERT(UDP_HDR_ALIGNED_P(uh));
1.53 itojun 383:
1.57 itojun 384: /* destination port of 0 is illegal, based on RFC768. */
385: if (uh->uh_dport == 0)
386: goto bad;
387:
1.53 itojun 388: /*
389: * Make mbuf data length reflect UDP length.
390: * If not enough data to reflect UDP length, drop.
391: */
1.96 itojun 392: ip_len = ntohs(ip->ip_len);
1.53 itojun 393: len = ntohs((u_int16_t)uh->uh_ulen);
1.96 itojun 394: if (ip_len != iphlen + len) {
395: if (ip_len < iphlen + len || len < sizeof(struct udphdr)) {
1.166 thorpej 396: UDP_STATINC(UDP_STAT_BADLEN);
1.53 itojun 397: goto bad;
398: }
1.96 itojun 399: m_adj(m, iphlen + len - ip_len);
1.53 itojun 400: }
401:
402: /*
403: * Checksum extended UDP header and data.
404: */
1.129 yamt 405: if (udp4_input_checksum(m, uh, iphlen, len))
406: goto badcsum;
1.53 itojun 407:
408: /* construct source and dst sockaddrs. */
1.159 dyoung 409: sockaddr_in_init(&src, &ip->ip_src, uh->uh_sport);
410: sockaddr_in_init(&dst, &ip->ip_dst, uh->uh_dport);
1.53 itojun 411:
1.144 manu 412: if ((n = udp4_realinput(&src, &dst, &m, iphlen)) == -1) {
1.166 thorpej 413: UDP_STATINC(UDP_STAT_HDROPS);
1.144 manu 414: return;
415: }
1.53 itojun 416: #ifdef INET6
417: if (IN_MULTICAST(ip->ip_dst.s_addr) || n == 0) {
418: struct sockaddr_in6 src6, dst6;
419:
1.171.2.2 yamt 420: memset(&src6, 0, sizeof(src6));
1.53 itojun 421: src6.sin6_family = AF_INET6;
422: src6.sin6_len = sizeof(struct sockaddr_in6);
423: src6.sin6_addr.s6_addr[10] = src6.sin6_addr.s6_addr[11] = 0xff;
1.171.2.2 yamt 424: memcpy(&src6.sin6_addr.s6_addr[12], &ip->ip_src,
1.53 itojun 425: sizeof(ip->ip_src));
426: src6.sin6_port = uh->uh_sport;
1.171.2.2 yamt 427: memset(&dst6, 0, sizeof(dst6));
1.53 itojun 428: dst6.sin6_family = AF_INET6;
429: dst6.sin6_len = sizeof(struct sockaddr_in6);
430: dst6.sin6_addr.s6_addr[10] = dst6.sin6_addr.s6_addr[11] = 0xff;
1.171.2.2 yamt 431: memcpy(&dst6.sin6_addr.s6_addr[12], &ip->ip_dst,
1.53 itojun 432: sizeof(ip->ip_dst));
433: dst6.sin6_port = uh->uh_dport;
434:
435: n += udp6_realinput(AF_INET, &src6, &dst6, m, iphlen);
436: }
437: #endif
438:
439: if (n == 0) {
440: if (m->m_flags & (M_BCAST | M_MCAST)) {
1.166 thorpej 441: UDP_STATINC(UDP_STAT_NOPORTBCAST);
1.53 itojun 442: goto bad;
443: }
1.166 thorpej 444: UDP_STATINC(UDP_STAT_NOPORT);
1.64 ws 445: #ifdef IPKDB
1.53 itojun 446: if (checkipkdb(&ip->ip_src, uh->uh_sport, uh->uh_dport,
447: m, iphlen + sizeof(struct udphdr),
448: m->m_pkthdr.len - iphlen - sizeof(struct udphdr))) {
449: /*
450: * It was a debugger connect packet,
451: * just drop it now
452: */
453: goto bad;
454: }
455: #endif
456: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
457: m = NULL;
458: }
459:
460: bad:
461: if (m)
462: m_freem(m);
1.78 thorpej 463: return;
464:
465: badcsum:
466: m_freem(m);
1.53 itojun 467: }
1.72 itojun 468: #endif
1.53 itojun 469:
470: #ifdef INET6
1.129 yamt 471: static int
472: udp6_input_checksum(struct mbuf *m, const struct udphdr *uh, int off, int len)
473: {
474:
1.140 yamt 475: /*
476: * XXX it's better to record and check if this mbuf is
477: * already checked.
478: */
479:
1.129 yamt 480: if (__predict_false((m->m_flags & M_LOOP) && !udp_do_loopback_cksum)) {
481: goto good;
482: }
483: if (uh->uh_sum == 0) {
1.168 thorpej 484: UDP6_STATINC(UDP6_STAT_NOSUM);
1.129 yamt 485: goto bad;
486: }
1.140 yamt 487:
488: switch (m->m_pkthdr.csum_flags &
489: ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv6) |
490: M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) {
491: case M_CSUM_UDPv6|M_CSUM_TCP_UDP_BAD:
492: UDP_CSUM_COUNTER_INCR(&udp6_hwcsum_bad);
1.168 thorpej 493: UDP6_STATINC(UDP6_STAT_BADSUM);
1.129 yamt 494: goto bad;
1.140 yamt 495:
496: #if 0 /* notyet */
497: case M_CSUM_UDPv6|M_CSUM_DATA:
498: #endif
499:
500: case M_CSUM_UDPv6:
501: /* Checksum was okay. */
502: UDP_CSUM_COUNTER_INCR(&udp6_hwcsum_ok);
503: break;
504:
505: default:
506: /*
507: * Need to compute it ourselves. Maybe skip checksum
508: * on loopback interfaces.
509: */
510: UDP_CSUM_COUNTER_INCR(&udp6_swcsum);
511: if (in6_cksum(m, IPPROTO_UDP, off, len) != 0) {
1.168 thorpej 512: UDP6_STATINC(UDP6_STAT_BADSUM);
1.140 yamt 513: goto bad;
514: }
1.129 yamt 515: }
516:
517: good:
518: return 0;
519: bad:
520: return -1;
521: }
522:
1.53 itojun 523: int
1.154 yamt 524: udp6_input(struct mbuf **mp, int *offp, int proto)
1.53 itojun 525: {
526: struct mbuf *m = *mp;
527: int off = *offp;
528: struct sockaddr_in6 src, dst;
529: struct ip6_hdr *ip6;
530: struct udphdr *uh;
531: u_int32_t plen, ulen;
532:
1.76 itojun 533: ip6 = mtod(m, struct ip6_hdr *);
534:
1.53 itojun 535: #if defined(NFAITH) && 0 < NFAITH
1.76 itojun 536: if (faithprefix(&ip6->ip6_dst)) {
537: /* send icmp6 host unreach? */
538: m_freem(m);
539: return IPPROTO_DONE;
1.53 itojun 540: }
541: #endif
542:
1.168 thorpej 543: UDP6_STATINC(UDP6_STAT_IPACKETS);
1.53 itojun 544:
545: /* check for jumbogram is done in ip6_input. we can trust pkthdr.len */
546: plen = m->m_pkthdr.len - off;
547: IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(struct udphdr));
548: if (uh == NULL) {
1.167 thorpej 549: IP6_STATINC(IP6_STAT_TOOSHORT);
1.53 itojun 550: return IPPROTO_DONE;
551: }
1.95 thorpej 552: KASSERT(UDP_HDR_ALIGNED_P(uh));
1.53 itojun 553: ulen = ntohs((u_short)uh->uh_ulen);
1.69 itojun 554: /*
555: * RFC2675 section 4: jumbograms will have 0 in the UDP header field,
556: * iff payload length > 0xffff.
557: */
1.53 itojun 558: if (ulen == 0 && plen > 0xffff)
559: ulen = plen;
560:
561: if (plen != ulen) {
1.168 thorpej 562: UDP6_STATINC(UDP6_STAT_BADLEN);
1.54 itojun 563: goto bad;
564: }
565:
1.57 itojun 566: /* destination port of 0 is illegal, based on RFC768. */
567: if (uh->uh_dport == 0)
568: goto bad;
569:
1.54 itojun 570: /* Be proactive about malicious use of IPv4 mapped address */
571: if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
572: IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
573: /* XXX stat */
1.53 itojun 574: goto bad;
575: }
576:
577: /*
1.125 thorpej 578: * Checksum extended UDP header and data. Maybe skip checksum
579: * on loopback interfaces.
1.53 itojun 580: */
1.129 yamt 581: if (udp6_input_checksum(m, uh, off, ulen))
582: goto bad;
1.53 itojun 583:
584: /*
585: * Construct source and dst sockaddrs.
586: */
1.171.2.2 yamt 587: memset(&src, 0, sizeof(src));
1.53 itojun 588: src.sin6_family = AF_INET6;
589: src.sin6_len = sizeof(struct sockaddr_in6);
1.146 rpaulo 590: src.sin6_addr = ip6->ip6_src;
1.53 itojun 591: src.sin6_port = uh->uh_sport;
1.171.2.2 yamt 592: memset(&dst, 0, sizeof(dst));
1.53 itojun 593: dst.sin6_family = AF_INET6;
594: dst.sin6_len = sizeof(struct sockaddr_in6);
1.146 rpaulo 595: dst.sin6_addr = ip6->ip6_dst;
1.53 itojun 596: dst.sin6_port = uh->uh_dport;
597:
598: if (udp6_realinput(AF_INET6, &src, &dst, m, off) == 0) {
599: if (m->m_flags & M_MCAST) {
1.168 thorpej 600: UDP6_STATINC(UDP6_STAT_NOPORTMCAST);
1.53 itojun 601: goto bad;
602: }
1.168 thorpej 603: UDP6_STATINC(UDP6_STAT_NOPORT);
1.53 itojun 604: icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
605: m = NULL;
606: }
607:
608: bad:
609: if (m)
610: m_freem(m);
611: return IPPROTO_DONE;
612: }
613: #endif
614:
1.72 itojun 615: #ifdef INET
1.53 itojun 616: static void
1.119 matt 617: udp4_sendup(struct mbuf *m, int off /* offset of data portion */,
618: struct sockaddr *src, struct socket *so)
1.53 itojun 619: {
620: struct mbuf *opts = NULL;
621: struct mbuf *n;
622: struct inpcb *inp = NULL;
623:
624: if (!so)
625: return;
626: switch (so->so_proto->pr_domain->dom_family) {
627: case AF_INET:
628: inp = sotoinpcb(so);
629: break;
630: #ifdef INET6
631: case AF_INET6:
632: break;
633: #endif
634: default:
635: return;
636: }
637:
1.105 jonathan 638: #if defined(IPSEC) || defined(FAST_IPSEC)
1.53 itojun 639: /* check AH/ESP integrity. */
640: if (so != NULL && ipsec4_in_reject_so(m, so)) {
1.169 thorpej 641: IPSEC_STATINC(IPSEC_STAT_IN_POLVIO);
1.162 dyoung 642: if ((n = m_copypacket(m, M_DONTWAIT)) != NULL)
1.110 itojun 643: icmp_error(n, ICMP_UNREACH, ICMP_UNREACH_ADMIN_PROHIBIT,
644: 0, 0);
1.53 itojun 645: return;
646: }
647: #endif /*IPSEC*/
648:
1.162 dyoung 649: if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) {
1.53 itojun 650: if (inp && (inp->inp_flags & INP_CONTROLOPTS
1.171.2.2 yamt 651: #ifdef SO_OTIMESTAMP
652: || so->so_options & SO_OTIMESTAMP
653: #endif
1.53 itojun 654: || so->so_options & SO_TIMESTAMP)) {
655: struct ip *ip = mtod(n, struct ip *);
656: ip_savecontrol(inp, &opts, ip, n);
657: }
658:
659: m_adj(n, off);
660: if (sbappendaddr(&so->so_rcv, src, n,
661: opts) == 0) {
662: m_freem(n);
663: if (opts)
664: m_freem(opts);
1.124 darrenr 665: so->so_rcv.sb_overflowed++;
1.166 thorpej 666: UDP_STATINC(UDP_STAT_FULLSOCK);
1.53 itojun 667: } else
668: sorwakeup(so);
669: }
670: }
1.72 itojun 671: #endif
1.53 itojun 672:
673: #ifdef INET6
674: static void
1.119 matt 675: udp6_sendup(struct mbuf *m, int off /* offset of data portion */,
676: struct sockaddr *src, struct socket *so)
1.53 itojun 677: {
678: struct mbuf *opts = NULL;
679: struct mbuf *n;
680: struct in6pcb *in6p = NULL;
681:
682: if (!so)
683: return;
684: if (so->so_proto->pr_domain->dom_family != AF_INET6)
685: return;
686: in6p = sotoin6pcb(so);
687:
1.105 jonathan 688: #if defined(IPSEC) || defined(FAST_IPSEC)
1.53 itojun 689: /* check AH/ESP integrity. */
690: if (so != NULL && ipsec6_in_reject_so(m, so)) {
1.169 thorpej 691: IPSEC6_STATINC(IPSEC_STAT_IN_POLVIO);
1.162 dyoung 692: if ((n = m_copypacket(m, M_DONTWAIT)) != NULL)
1.110 itojun 693: icmp6_error(n, ICMP6_DST_UNREACH,
694: ICMP6_DST_UNREACH_ADMIN, 0);
1.53 itojun 695: return;
696: }
697: #endif /*IPSEC*/
698:
1.162 dyoung 699: if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) {
1.53 itojun 700: if (in6p && (in6p->in6p_flags & IN6P_CONTROLOPTS
1.171.2.2 yamt 701: #ifdef SO_OTIMESTAMP
702: || in6p->in6p_socket->so_options & SO_OTIMESTAMP
703: #endif
704: || in6p->in6p_socket->so_options & SO_TIMESTAMP)) {
1.53 itojun 705: struct ip6_hdr *ip6 = mtod(n, struct ip6_hdr *);
706: ip6_savecontrol(in6p, &opts, ip6, n);
707: }
708:
709: m_adj(n, off);
710: if (sbappendaddr(&so->so_rcv, src, n, opts) == 0) {
711: m_freem(n);
712: if (opts)
713: m_freem(opts);
1.124 darrenr 714: so->so_rcv.sb_overflowed++;
1.168 thorpej 715: UDP6_STATINC(UDP6_STAT_FULLSOCK);
1.53 itojun 716: } else
717: sorwakeup(so);
718: }
719: }
720: #endif
721:
1.72 itojun 722: #ifdef INET
1.53 itojun 723: static int
1.119 matt 724: udp4_realinput(struct sockaddr_in *src, struct sockaddr_in *dst,
1.144 manu 725: struct mbuf **mp, int off /* offset of udphdr */)
1.53 itojun 726: {
727: u_int16_t *sport, *dport;
728: int rcvcnt;
729: struct in_addr *src4, *dst4;
1.109 itojun 730: struct inpcb_hdr *inph;
1.53 itojun 731: struct inpcb *inp;
1.144 manu 732: struct mbuf *m = *mp;
1.53 itojun 733:
734: rcvcnt = 0;
735: off += sizeof(struct udphdr); /* now, offset of payload */
736:
737: if (src->sin_family != AF_INET || dst->sin_family != AF_INET)
738: goto bad;
739:
740: src4 = &src->sin_addr;
741: sport = &src->sin_port;
742: dst4 = &dst->sin_addr;
743: dport = &dst->sin_port;
744:
1.73 itojun 745: if (IN_MULTICAST(dst4->s_addr) ||
1.53 itojun 746: in_broadcast(*dst4, m->m_pkthdr.rcvif)) {
747: /*
748: * Deliver a multicast or broadcast datagram to *all* sockets
749: * for which the local and remote addresses and ports match
750: * those of the incoming datagram. This allows more than
751: * one process to receive multi/broadcasts on the same port.
752: * (This really ought to be done for unicast datagrams as
753: * well, but that would cause problems with existing
754: * applications that open both address-specific sockets and
755: * a wildcard socket listening to the same port -- they would
756: * end up receiving duplicates of every unicast datagram.
757: * Those applications open the multiple sockets to overcome an
758: * inadequacy of the UDP socket interface, but for backwards
759: * compatibility we avoid the problem here rather than
760: * fixing the interface. Maybe 4.5BSD will remedy this?)
761: */
762:
763: /*
1.92 itojun 764: * KAME note: traditionally we dropped udpiphdr from mbuf here.
1.71 itojun 765: * we need udpiphdr for IPsec processing so we do that later.
1.53 itojun 766: */
767: /*
768: * Locate pcb(s) for datagram.
769: */
1.109 itojun 770: CIRCLEQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) {
771: inp = (struct inpcb *)inph;
772: if (inp->inp_af != AF_INET)
773: continue;
774:
1.53 itojun 775: if (inp->inp_lport != *dport)
776: continue;
777: if (!in_nullhost(inp->inp_laddr)) {
778: if (!in_hosteq(inp->inp_laddr, *dst4))
779: continue;
780: }
781: if (!in_nullhost(inp->inp_faddr)) {
782: if (!in_hosteq(inp->inp_faddr, *src4) ||
783: inp->inp_fport != *sport)
784: continue;
785: }
786:
787: udp4_sendup(m, off, (struct sockaddr *)src,
788: inp->inp_socket);
789: rcvcnt++;
790:
791: /*
792: * Don't look for additional matches if this one does
793: * not have either the SO_REUSEPORT or SO_REUSEADDR
794: * socket options set. This heuristic avoids searching
795: * through all pcbs in the common case of a non-shared
796: * port. It assumes that an application will never
797: * clear these options after setting them.
798: */
799: if ((inp->inp_socket->so_options &
800: (SO_REUSEPORT|SO_REUSEADDR)) == 0)
801: break;
802: }
803: } else {
804: /*
805: * Locate pcb for datagram.
806: */
807: inp = in_pcblookup_connect(&udbtable, *src4, *sport, *dst4, *dport);
808: if (inp == 0) {
1.166 thorpej 809: UDP_STATINC(UDP_STAT_PCBHASHMISS);
1.53 itojun 810: inp = in_pcblookup_bind(&udbtable, *dst4, *dport);
1.82 itojun 811: if (inp == 0)
1.53 itojun 812: return rcvcnt;
813: }
814:
1.130 manu 815: #ifdef IPSEC_NAT_T
816: /* Handle ESP over UDP */
817: if (inp->inp_flags & INP_ESPINUDP_ALL) {
818: struct sockaddr *sa = (struct sockaddr *)src;
819:
1.144 manu 820: switch(udp4_espinudp(mp, off, sa, inp->inp_socket)) {
821: case -1: /* Error, m was freeed */
822: rcvcnt = -1;
823: goto bad;
824: break;
825:
826: case 1: /* ESP over UDP */
1.130 manu 827: rcvcnt++;
828: goto bad;
1.144 manu 829: break;
830:
831: case 0: /* plain UDP */
832: default: /* Unexpected */
833: /*
834: * Normal UDP processing will take place
835: * m may have changed.
836: */
837: m = *mp;
838: break;
1.130 manu 839: }
840: }
841: #endif
842:
1.171.2.3 yamt 843: /*
844: * Check the minimum TTL for socket.
845: */
846: if (mtod(m, struct ip *)->ip_ttl < inp->inp_ip_minttl)
847: goto bad;
848:
1.53 itojun 849: udp4_sendup(m, off, (struct sockaddr *)src, inp->inp_socket);
850: rcvcnt++;
851: }
852:
853: bad:
854: return rcvcnt;
855: }
1.72 itojun 856: #endif
1.53 itojun 857:
858: #ifdef INET6
859: static int
1.119 matt 860: udp6_realinput(int af, struct sockaddr_in6 *src, struct sockaddr_in6 *dst,
861: struct mbuf *m, int off)
1.53 itojun 862: {
1.79 itojun 863: u_int16_t sport, dport;
1.53 itojun 864: int rcvcnt;
1.146 rpaulo 865: struct in6_addr src6, *dst6;
1.79 itojun 866: const struct in_addr *dst4;
1.109 itojun 867: struct inpcb_hdr *inph;
1.53 itojun 868: struct in6pcb *in6p;
869:
870: rcvcnt = 0;
871: off += sizeof(struct udphdr); /* now, offset of payload */
872:
873: if (af != AF_INET && af != AF_INET6)
874: goto bad;
875: if (src->sin6_family != AF_INET6 || dst->sin6_family != AF_INET6)
876: goto bad;
877:
1.146 rpaulo 878: src6 = src->sin6_addr;
879: if (sa6_recoverscope(src) != 0) {
880: /* XXX: should be impossible. */
881: goto bad;
882: }
1.79 itojun 883: sport = src->sin6_port;
1.146 rpaulo 884:
1.79 itojun 885: dport = dst->sin6_port;
1.88 itojun 886: dst4 = (struct in_addr *)&dst->sin6_addr.s6_addr[12];
1.146 rpaulo 887: dst6 = &dst->sin6_addr;
1.53 itojun 888:
1.146 rpaulo 889: if (IN6_IS_ADDR_MULTICAST(dst6) ||
1.79 itojun 890: (af == AF_INET && IN_MULTICAST(dst4->s_addr))) {
1.53 itojun 891: /*
892: * Deliver a multicast or broadcast datagram to *all* sockets
893: * for which the local and remote addresses and ports match
894: * those of the incoming datagram. This allows more than
895: * one process to receive multi/broadcasts on the same port.
896: * (This really ought to be done for unicast datagrams as
897: * well, but that would cause problems with existing
898: * applications that open both address-specific sockets and
899: * a wildcard socket listening to the same port -- they would
900: * end up receiving duplicates of every unicast datagram.
901: * Those applications open the multiple sockets to overcome an
902: * inadequacy of the UDP socket interface, but for backwards
903: * compatibility we avoid the problem here rather than
904: * fixing the interface. Maybe 4.5BSD will remedy this?)
905: */
906:
907: /*
1.92 itojun 908: * KAME note: traditionally we dropped udpiphdr from mbuf here.
1.71 itojun 909: * we need udpiphdr for IPsec processing so we do that later.
1.53 itojun 910: */
911: /*
912: * Locate pcb(s) for datagram.
913: */
1.109 itojun 914: CIRCLEQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) {
915: in6p = (struct in6pcb *)inph;
916: if (in6p->in6p_af != AF_INET6)
917: continue;
918:
1.79 itojun 919: if (in6p->in6p_lport != dport)
1.53 itojun 920: continue;
921: if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
1.146 rpaulo 922: if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr,
923: dst6))
1.53 itojun 924: continue;
1.92 itojun 925: } else {
1.146 rpaulo 926: if (IN6_IS_ADDR_V4MAPPED(dst6) &&
1.85 itojun 927: (in6p->in6p_flags & IN6P_IPV6_V6ONLY))
1.55 itojun 928: continue;
929: }
1.53 itojun 930: if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
1.79 itojun 931: if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr,
932: &src6) || in6p->in6p_fport != sport)
1.53 itojun 933: continue;
1.92 itojun 934: } else {
1.79 itojun 935: if (IN6_IS_ADDR_V4MAPPED(&src6) &&
1.85 itojun 936: (in6p->in6p_flags & IN6P_IPV6_V6ONLY))
1.55 itojun 937: continue;
938: }
1.53 itojun 939:
940: udp6_sendup(m, off, (struct sockaddr *)src,
941: in6p->in6p_socket);
942: rcvcnt++;
943:
944: /*
945: * Don't look for additional matches if this one does
946: * not have either the SO_REUSEPORT or SO_REUSEADDR
947: * socket options set. This heuristic avoids searching
948: * through all pcbs in the common case of a non-shared
949: * port. It assumes that an application will never
950: * clear these options after setting them.
951: */
952: if ((in6p->in6p_socket->so_options &
953: (SO_REUSEPORT|SO_REUSEADDR)) == 0)
954: break;
955: }
956: } else {
957: /*
958: * Locate pcb for datagram.
959: */
1.146 rpaulo 960: in6p = in6_pcblookup_connect(&udbtable, &src6, sport, dst6,
961: dport, 0);
1.53 itojun 962: if (in6p == 0) {
1.166 thorpej 963: UDP_STATINC(UDP_STAT_PCBHASHMISS);
1.146 rpaulo 964: in6p = in6_pcblookup_bind(&udbtable, dst6, dport, 0);
1.82 itojun 965: if (in6p == 0)
1.53 itojun 966: return rcvcnt;
967: }
968:
969: udp6_sendup(m, off, (struct sockaddr *)src, in6p->in6p_socket);
970: rcvcnt++;
971: }
972:
973: bad:
974: return rcvcnt;
975: }
976: #endif
1.1 cgd 977:
1.72 itojun 978: #ifdef INET
1.1 cgd 979: /*
980: * Notify a udp user of an asynchronous error;
981: * just wake up so that he can collect error status.
982: */
1.7 mycroft 983: static void
1.119 matt 984: udp_notify(struct inpcb *inp, int errno)
1.1 cgd 985: {
986: inp->inp_socket->so_error = errno;
987: sorwakeup(inp->inp_socket);
988: sowwakeup(inp->inp_socket);
989: }
990:
1.27 christos 991: void *
1.157 dyoung 992: udp_ctlinput(int cmd, const struct sockaddr *sa, void *v)
1.1 cgd 993: {
1.66 augustss 994: struct ip *ip = v;
995: struct udphdr *uh;
1.119 matt 996: void (*notify)(struct inpcb *, int) = udp_notify;
1.21 mycroft 997: int errno;
1.1 cgd 998:
1.53 itojun 999: if (sa->sa_family != AF_INET
1000: || sa->sa_len != sizeof(struct sockaddr_in))
1.51 itojun 1001: return NULL;
1.20 mycroft 1002: if ((unsigned)cmd >= PRC_NCMDS)
1.27 christos 1003: return NULL;
1.20 mycroft 1004: errno = inetctlerrmap[cmd];
1.18 mycroft 1005: if (PRC_IS_REDIRECT(cmd))
1.19 mycroft 1006: notify = in_rtchange, ip = 0;
1.18 mycroft 1007: else if (cmd == PRC_HOSTDEAD)
1.19 mycroft 1008: ip = 0;
1.23 cgd 1009: else if (errno == 0)
1.27 christos 1010: return NULL;
1.19 mycroft 1011: if (ip) {
1.158 christos 1012: uh = (struct udphdr *)((char *)ip + (ip->ip_hl << 2));
1.157 dyoung 1013: in_pcbnotify(&udbtable, satocsin(sa)->sin_addr, uh->uh_dport,
1.34 mycroft 1014: ip->ip_src, uh->uh_sport, errno, notify);
1.53 itojun 1015:
1016: /* XXX mapped address case */
1.19 mycroft 1017: } else
1.157 dyoung 1018: in_pcbnotifyall(&udbtable, satocsin(sa)->sin_addr, errno,
1.34 mycroft 1019: notify);
1.27 christos 1020: return NULL;
1.1 cgd 1021: }
1022:
1.7 mycroft 1023: int
1.171.2.2 yamt 1024: udp_ctloutput(int op, struct socket *so, struct sockopt *sopt)
1.130 manu 1025: {
1026: int s;
1027: int error = 0;
1028: struct inpcb *inp;
1029: int family;
1.171.2.2 yamt 1030: int optval;
1.130 manu 1031:
1032: family = so->so_proto->pr_domain->dom_family;
1033:
1034: s = splsoftnet();
1035: switch (family) {
1036: #ifdef INET
1037: case PF_INET:
1.171.2.2 yamt 1038: if (sopt->sopt_level != IPPROTO_UDP) {
1039: error = ip_ctloutput(op, so, sopt);
1.130 manu 1040: goto end;
1041: }
1042: break;
1043: #endif
1044: #ifdef INET6
1045: case PF_INET6:
1.171.2.2 yamt 1046: if (sopt->sopt_level != IPPROTO_UDP) {
1047: error = ip6_ctloutput(op, so, sopt);
1.130 manu 1048: goto end;
1049: }
1050: break;
1051: #endif
1052: default:
1053: error = EAFNOSUPPORT;
1054: goto end;
1055: }
1056:
1057:
1058: switch (op) {
1059: case PRCO_SETOPT:
1060: inp = sotoinpcb(so);
1061:
1.171.2.2 yamt 1062: switch (sopt->sopt_name) {
1.130 manu 1063: case UDP_ENCAP:
1.171.2.2 yamt 1064: error = sockopt_getint(sopt, &optval);
1065: if (error)
1.153 yamt 1066: break;
1.131 perry 1067:
1.171.2.2 yamt 1068: switch(optval) {
1.130 manu 1069: #ifdef IPSEC_NAT_T
1070: case 0:
1071: inp->inp_flags &= ~INP_ESPINUDP_ALL;
1072: break;
1073:
1074: case UDP_ENCAP_ESPINUDP:
1075: inp->inp_flags &= ~INP_ESPINUDP_ALL;
1076: inp->inp_flags |= INP_ESPINUDP;
1077: break;
1.131 perry 1078:
1.130 manu 1079: case UDP_ENCAP_ESPINUDP_NON_IKE:
1080: inp->inp_flags &= ~INP_ESPINUDP_ALL;
1081: inp->inp_flags |= INP_ESPINUDP_NON_IKE;
1082: break;
1083: #endif
1084: default:
1085: error = EINVAL;
1086: break;
1087: }
1088: break;
1089:
1090: default:
1091: error = ENOPROTOOPT;
1092: break;
1093: }
1094: break;
1095:
1096: default:
1097: error = EINVAL;
1098: break;
1.131 perry 1099: }
1100:
1.130 manu 1101: end:
1102: splx(s);
1103: return error;
1104: }
1.131 perry 1105:
1.130 manu 1106:
1107: int
1.27 christos 1108: udp_output(struct mbuf *m, ...)
1109: {
1.66 augustss 1110: struct inpcb *inp;
1111: struct udpiphdr *ui;
1.125 thorpej 1112: struct route *ro;
1.66 augustss 1113: int len = m->m_pkthdr.len;
1.31 mycroft 1114: int error = 0;
1.27 christos 1115: va_list ap;
1116:
1.98 matt 1117: MCLAIM(m, &udp_tx_mowner);
1.27 christos 1118: va_start(ap, m);
1119: inp = va_arg(ap, struct inpcb *);
1120: va_end(ap);
1.1 cgd 1121:
1122: /*
1123: * Calculate data length and get a mbuf
1124: * for UDP and IP headers.
1125: */
1.13 mycroft 1126: M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT);
1127: if (m == 0) {
1128: error = ENOBUFS;
1.39 thorpej 1129: goto release;
1130: }
1131:
1132: /*
1133: * Compute the packet length of the IP header, and
1134: * punt if the length looks bogus.
1135: */
1.96 itojun 1136: if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) {
1.39 thorpej 1137: error = EMSGSIZE;
1.13 mycroft 1138: goto release;
1139: }
1.1 cgd 1140:
1141: /*
1142: * Fill in mbuf with extended UDP header
1143: * and addresses and length put into network format.
1144: */
1145: ui = mtod(m, struct udpiphdr *);
1146: ui->ui_pr = IPPROTO_UDP;
1147: ui->ui_src = inp->inp_laddr;
1148: ui->ui_dst = inp->inp_faddr;
1149: ui->ui_sport = inp->inp_lport;
1150: ui->ui_dport = inp->inp_fport;
1.78 thorpej 1151: ui->ui_ulen = htons((u_int16_t)len + sizeof(struct udphdr));
1.1 cgd 1152:
1.125 thorpej 1153: ro = &inp->inp_route;
1154:
1.1 cgd 1155: /*
1.78 thorpej 1156: * Set up checksum and output datagram.
1.1 cgd 1157: */
1158: if (udpcksum) {
1.78 thorpej 1159: /*
1160: * XXX Cache pseudo-header checksum part for
1161: * XXX "connected" UDP sockets.
1162: */
1163: ui->ui_sum = in_cksum_phdr(ui->ui_src.s_addr,
1164: ui->ui_dst.s_addr, htons((u_int16_t)len +
1165: sizeof(struct udphdr) + IPPROTO_UDP));
1.135 yamt 1166: m->m_pkthdr.csum_flags = M_CSUM_UDPv4;
1.78 thorpej 1167: m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
1168: } else
1169: ui->ui_sum = 0;
1.96 itojun 1170: ((struct ip *)ui)->ip_len = htons(sizeof (struct udpiphdr) + len);
1.1 cgd 1171: ((struct ip *)ui)->ip_ttl = inp->inp_ip.ip_ttl; /* XXX */
1172: ((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; /* XXX */
1.166 thorpej 1173: UDP_STATINC(UDP_STAT_OPACKETS);
1.48 itojun 1174:
1.125 thorpej 1175: return (ip_output(m, inp->inp_options, ro,
1.12 mycroft 1176: inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST),
1.107 itojun 1177: inp->inp_moptions, inp->inp_socket));
1.1 cgd 1178:
1179: release:
1180: m_freem(m);
1181: return (error);
1182: }
1183:
1.42 thorpej 1184: int udp_sendspace = 9216; /* really max datagram size */
1185: int udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in));
1.1 cgd 1186: /* 40 1K datagrams */
1187:
1188: /*ARGSUSED*/
1.7 mycroft 1189: int
1.119 matt 1190: udp_usrreq(struct socket *so, int req, struct mbuf *m, struct mbuf *nam,
1.145 christos 1191: struct mbuf *control, struct lwp *l)
1.1 cgd 1192: {
1.66 augustss 1193: struct inpcb *inp;
1.1 cgd 1194: int s;
1.66 augustss 1195: int error = 0;
1.1 cgd 1196:
1197: if (req == PRU_CONTROL)
1.158 christos 1198: return (in_control(so, (long)m, (void *)nam,
1.148 ad 1199: (struct ifnet *)control, l));
1.59 thorpej 1200:
1.149 tls 1201: s = splsoftnet();
1202:
1.60 thorpej 1203: if (req == PRU_PURGEIF) {
1.170 ad 1204: mutex_enter(softnet_lock);
1.80 itojun 1205: in_pcbpurgeif0(&udbtable, (struct ifnet *)control);
1.60 thorpej 1206: in_purgeif((struct ifnet *)control);
1207: in_pcbpurgeif(&udbtable, (struct ifnet *)control);
1.170 ad 1208: mutex_exit(softnet_lock);
1.149 tls 1209: splx(s);
1.59 thorpej 1210: return (0);
1211: }
1.31 mycroft 1212:
1213: inp = sotoinpcb(so);
1.32 mycroft 1214: #ifdef DIAGNOSTIC
1215: if (req != PRU_SEND && req != PRU_SENDOOB && control)
1216: panic("udp_usrreq: unexpected control mbuf");
1217: #endif
1.170 ad 1218: if (req == PRU_ATTACH) {
1219: sosetlock(so);
1220: } else if (inp == 0) {
1.31 mycroft 1221: error = EINVAL;
1222: goto release;
1223: }
1224:
1.1 cgd 1225: /*
1226: * Note: need to block udp_input while changing
1227: * the udp pcb queue and/or pcb addresses.
1228: */
1229: switch (req) {
1230:
1231: case PRU_ATTACH:
1.31 mycroft 1232: if (inp != 0) {
1233: error = EISCONN;
1.1 cgd 1234: break;
1235: }
1.98 matt 1236: #ifdef MBUFTRACE
1237: so->so_mowner = &udp_mowner;
1238: so->so_rcv.sb_mowner = &udp_rx_mowner;
1239: so->so_snd.sb_mowner = &udp_tx_mowner;
1240: #endif
1.31 mycroft 1241: if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
1242: error = soreserve(so, udp_sendspace, udp_recvspace);
1243: if (error)
1244: break;
1245: }
1.18 mycroft 1246: error = in_pcballoc(so, &udbtable);
1.1 cgd 1247: if (error)
1248: break;
1.31 mycroft 1249: inp = sotoinpcb(so);
1250: inp->inp_ip.ip_ttl = ip_defttl;
1.1 cgd 1251: break;
1252:
1253: case PRU_DETACH:
1.31 mycroft 1254: in_pcbdetach(inp);
1.1 cgd 1255: break;
1256:
1257: case PRU_BIND:
1.148 ad 1258: error = in_pcbbind(inp, nam, l);
1.1 cgd 1259: break;
1260:
1261: case PRU_LISTEN:
1262: error = EOPNOTSUPP;
1263: break;
1264:
1265: case PRU_CONNECT:
1.148 ad 1266: error = in_pcbconnect(inp, nam, l);
1.31 mycroft 1267: if (error)
1.1 cgd 1268: break;
1.31 mycroft 1269: soisconnected(so);
1.1 cgd 1270: break;
1271:
1272: case PRU_CONNECT2:
1273: error = EOPNOTSUPP;
1274: break;
1275:
1276: case PRU_DISCONNECT:
1.31 mycroft 1277: /*soisdisconnected(so);*/
1278: so->so_state &= ~SS_ISCONNECTED; /* XXX */
1.1 cgd 1279: in_pcbdisconnect(inp);
1.34 mycroft 1280: inp->inp_laddr = zeroin_addr; /* XXX */
1.35 mycroft 1281: in_pcbstate(inp, INP_BOUND); /* XXX */
1.1 cgd 1282: break;
1283:
1284: case PRU_SHUTDOWN:
1285: socantsendmore(so);
1286: break;
1287:
1.31 mycroft 1288: case PRU_RCVD:
1289: error = EOPNOTSUPP;
1.1 cgd 1290: break;
1291:
1.31 mycroft 1292: case PRU_SEND:
1.32 mycroft 1293: if (control && control->m_len) {
1294: m_freem(control);
1295: m_freem(m);
1296: error = EINVAL;
1297: break;
1298: }
1.31 mycroft 1299: {
1.35 mycroft 1300: struct in_addr laddr; /* XXX */
1.1 cgd 1301:
1.31 mycroft 1302: if (nam) {
1.35 mycroft 1303: laddr = inp->inp_laddr; /* XXX */
1.31 mycroft 1304: if ((so->so_state & SS_ISCONNECTED) != 0) {
1305: error = EISCONN;
1.32 mycroft 1306: goto die;
1.31 mycroft 1307: }
1.148 ad 1308: error = in_pcbconnect(inp, nam, l);
1.100 matt 1309: if (error)
1310: goto die;
1.31 mycroft 1311: } else {
1312: if ((so->so_state & SS_ISCONNECTED) == 0) {
1313: error = ENOTCONN;
1.32 mycroft 1314: goto die;
1.31 mycroft 1315: }
1316: }
1.33 mycroft 1317: error = udp_output(m, inp);
1.100 matt 1318: m = NULL;
1.31 mycroft 1319: if (nam) {
1320: in_pcbdisconnect(inp);
1.35 mycroft 1321: inp->inp_laddr = laddr; /* XXX */
1322: in_pcbstate(inp, INP_BOUND); /* XXX */
1.31 mycroft 1323: }
1.100 matt 1324: die:
1325: if (m)
1326: m_freem(m);
1.31 mycroft 1327: }
1.1 cgd 1328: break;
1329:
1330: case PRU_SENSE:
1331: /*
1332: * stat: don't bother with a blocksize.
1333: */
1.31 mycroft 1334: splx(s);
1.1 cgd 1335: return (0);
1336:
1.31 mycroft 1337: case PRU_RCVOOB:
1338: error = EOPNOTSUPP;
1339: break;
1340:
1.1 cgd 1341: case PRU_SENDOOB:
1.32 mycroft 1342: m_freem(control);
1.31 mycroft 1343: m_freem(m);
1.1 cgd 1344: error = EOPNOTSUPP;
1345: break;
1346:
1.31 mycroft 1347: case PRU_SOCKADDR:
1348: in_setsockaddr(inp, nam);
1349: break;
1350:
1351: case PRU_PEERADDR:
1352: in_setpeeraddr(inp, nam);
1353: break;
1.1 cgd 1354:
1355: default:
1356: panic("udp_usrreq");
1357: }
1358:
1359: release:
1.31 mycroft 1360: splx(s);
1.1 cgd 1361: return (error);
1.13 mycroft 1362: }
1363:
1.166 thorpej 1364: static int
1365: sysctl_net_inet_udp_stats(SYSCTLFN_ARGS)
1366: {
1367:
1.171.2.1 yamt 1368: return (NETSTAT_SYSCTL(udpstat_percpu, UDP_NSTATS));
1.166 thorpej 1369: }
1370:
1.13 mycroft 1371: /*
1372: * Sysctl for udp variables.
1373: */
1.171.2.4! yamt 1374: static void
! 1375: sysctl_net_inet_udp_setup(struct sysctllog **clog)
1.13 mycroft 1376: {
1.114 atatat 1377:
1.116 atatat 1378: sysctl_createv(clog, 0, NULL, NULL,
1379: CTLFLAG_PERMANENT,
1.114 atatat 1380: CTLTYPE_NODE, "net", NULL,
1381: NULL, 0, NULL, 0,
1382: CTL_NET, CTL_EOL);
1.116 atatat 1383: sysctl_createv(clog, 0, NULL, NULL,
1384: CTLFLAG_PERMANENT,
1.114 atatat 1385: CTLTYPE_NODE, "inet", NULL,
1386: NULL, 0, NULL, 0,
1387: CTL_NET, PF_INET, CTL_EOL);
1.116 atatat 1388: sysctl_createv(clog, 0, NULL, NULL,
1389: CTLFLAG_PERMANENT,
1.122 atatat 1390: CTLTYPE_NODE, "udp",
1391: SYSCTL_DESCR("UDPv4 related settings"),
1.114 atatat 1392: NULL, 0, NULL, 0,
1393: CTL_NET, PF_INET, IPPROTO_UDP, CTL_EOL);
1394:
1.116 atatat 1395: sysctl_createv(clog, 0, NULL, NULL,
1396: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122 atatat 1397: CTLTYPE_INT, "checksum",
1.123 heas 1398: SYSCTL_DESCR("Compute UDP checksums"),
1.114 atatat 1399: NULL, 0, &udpcksum, 0,
1400: CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_CHECKSUM,
1401: CTL_EOL);
1.116 atatat 1402: sysctl_createv(clog, 0, NULL, NULL,
1403: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122 atatat 1404: CTLTYPE_INT, "sendspace",
1405: SYSCTL_DESCR("Default UDP send buffer size"),
1.114 atatat 1406: NULL, 0, &udp_sendspace, 0,
1407: CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_SENDSPACE,
1408: CTL_EOL);
1.116 atatat 1409: sysctl_createv(clog, 0, NULL, NULL,
1410: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122 atatat 1411: CTLTYPE_INT, "recvspace",
1412: SYSCTL_DESCR("Default UDP receive buffer size"),
1.114 atatat 1413: NULL, 0, &udp_recvspace, 0,
1414: CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_RECVSPACE,
1415: CTL_EOL);
1.125 thorpej 1416: sysctl_createv(clog, 0, NULL, NULL,
1417: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1418: CTLTYPE_INT, "do_loopback_cksum",
1419: SYSCTL_DESCR("Perform UDP checksum on loopback"),
1420: NULL, 0, &udp_do_loopback_cksum, 0,
1421: CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_LOOPBACKCKSUM,
1422: CTL_EOL);
1.132 atatat 1423: sysctl_createv(clog, 0, NULL, NULL,
1424: CTLFLAG_PERMANENT,
1.134 atatat 1425: CTLTYPE_STRUCT, "pcblist",
1.132 atatat 1426: SYSCTL_DESCR("UDP protocol control block list"),
1427: sysctl_inpcblist, 0, &udbtable, 0,
1428: CTL_NET, PF_INET, IPPROTO_UDP, CTL_CREATE,
1429: CTL_EOL);
1.139 elad 1430: sysctl_createv(clog, 0, NULL, NULL,
1431: CTLFLAG_PERMANENT,
1432: CTLTYPE_STRUCT, "stats",
1433: SYSCTL_DESCR("UDP statistics"),
1.166 thorpej 1434: sysctl_net_inet_udp_stats, 0, NULL, 0,
1.139 elad 1435: CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_STATS,
1436: CTL_EOL);
1.1 cgd 1437: }
1.72 itojun 1438: #endif
1.130 manu 1439:
1.166 thorpej 1440: void
1441: udp_statinc(u_int stat)
1442: {
1443:
1444: KASSERT(stat < UDP_NSTATS);
1445: UDP_STATINC(stat);
1446: }
1447:
1.130 manu 1448: #if (defined INET && defined IPSEC_NAT_T)
1449: /*
1450: * Returns:
1451: * 1 if the packet was processed
1452: * 0 if normal UDP processing should take place
1.144 manu 1453: * -1 if an error occurent and m was freed
1.130 manu 1454: */
1455: static int
1.154 yamt 1456: udp4_espinudp(struct mbuf **mp, int off, struct sockaddr *src,
1.151 christos 1457: struct socket *so)
1.130 manu 1458: {
1459: size_t len;
1.158 christos 1460: void *data;
1.130 manu 1461: struct inpcb *inp;
1462: size_t skip = 0;
1463: size_t minlen;
1464: size_t iphdrlen;
1465: struct ip *ip;
1466: struct mbuf *n;
1.136 manu 1467: struct m_tag *tag;
1468: struct udphdr *udphdr;
1469: u_int16_t sport, dport;
1.144 manu 1470: struct mbuf *m = *mp;
1.130 manu 1471:
1.131 perry 1472: /*
1.130 manu 1473: * Collapse the mbuf chain if the first mbuf is too short
1474: * The longest case is: UDP + non ESP marker + ESP
1475: */
1476: minlen = off + sizeof(u_int64_t) + sizeof(struct esp);
1477: if (minlen > m->m_pkthdr.len)
1478: minlen = m->m_pkthdr.len;
1479:
1480: if (m->m_len < minlen) {
1.144 manu 1481: if ((*mp = m_pullup(m, minlen)) == NULL) {
1.130 manu 1482: printf("udp4_espinudp: m_pullup failed\n");
1.144 manu 1483: return -1;
1.130 manu 1484: }
1.144 manu 1485: m = *mp;
1.130 manu 1486: }
1487:
1.131 perry 1488: len = m->m_len - off;
1.158 christos 1489: data = mtod(m, char *) + off;
1.130 manu 1490: inp = sotoinpcb(so);
1491:
1492: /* Ignore keepalive packets */
1.158 christos 1493: if ((len == 1) && (*(unsigned char *)data == 0xff)) {
1.130 manu 1494: return 1;
1495: }
1496:
1.131 perry 1497: /*
1498: * Check that the payload is long enough to hold
1.130 manu 1499: * an ESP header and compute the length of encapsulation
1.131 perry 1500: * header to remove
1.130 manu 1501: */
1502: if (inp->inp_flags & INP_ESPINUDP) {
1503: u_int32_t *st = (u_int32_t *)data;
1504:
1505: if ((len <= sizeof(struct esp)) || (*st == 0))
1506: return 0; /* Normal UDP processing */
1507:
1508: skip = sizeof(struct udphdr);
1509: }
1510:
1511: if (inp->inp_flags & INP_ESPINUDP_NON_IKE) {
1.142 kleink 1512: u_int32_t *st = (u_int32_t *)data;
1.130 manu 1513:
1514: if ((len <= sizeof(u_int64_t) + sizeof(struct esp))
1.142 kleink 1515: || ((st[0] | st[1]) != 0))
1.130 manu 1516: return 0; /* Normal UDP processing */
1.131 perry 1517:
1.130 manu 1518: skip = sizeof(struct udphdr) + sizeof(u_int64_t);
1519: }
1520:
1521: /*
1.136 manu 1522: * Get the UDP ports. They are handled in network
1523: * order everywhere in IPSEC_NAT_T code.
1524: */
1.158 christos 1525: udphdr = (struct udphdr *)((char *)data - skip);
1.136 manu 1526: sport = udphdr->uh_sport;
1527: dport = udphdr->uh_dport;
1528:
1529: /*
1.130 manu 1530: * Remove the UDP header (and possibly the non ESP marker)
1531: * IP header lendth is iphdrlen
1.131 perry 1532: * Before:
1.130 manu 1533: * <--- off --->
1534: * +----+------+-----+
1535: * | IP | UDP | ESP |
1536: * +----+------+-----+
1537: * <-skip->
1538: * After:
1539: * +----+-----+
1540: * | IP | ESP |
1541: * +----+-----+
1542: * <-skip->
1543: */
1544: iphdrlen = off - sizeof(struct udphdr);
1.158 christos 1545: memmove(mtod(m, char *) + skip, mtod(m, void *), iphdrlen);
1.130 manu 1546: m_adj(m, skip);
1547:
1548: ip = mtod(m, struct ip *);
1549: ip->ip_len = htons(ntohs(ip->ip_len) - skip);
1550: ip->ip_p = IPPROTO_ESP;
1551:
1552: /*
1.131 perry 1553: * Copy the mbuf to avoid multiple free, as both
1554: * esp4_input (which we call) and udp_input (which
1.130 manu 1555: * called us) free the mbuf.
1556: */
1557: if ((n = m_dup(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
1558: printf("udp4_espinudp: m_dup failed\n");
1559: return 0;
1560: }
1561:
1.136 manu 1562: /*
1563: * Add a PACKET_TAG_IPSEC_NAT_T_PORT tag to remember
1564: * the source UDP port. This is required if we want
1565: * to select the right SPD for multiple hosts behind
1566: * same NAT
1567: */
1.137 manu 1568: if ((tag = m_tag_get(PACKET_TAG_IPSEC_NAT_T_PORTS,
1569: sizeof(sport) + sizeof(dport), M_DONTWAIT)) == NULL) {
1570: printf("udp4_espinudp: m_tag_get failed\n");
1.138 manu 1571: m_freem(n);
1.137 manu 1572: return 0;
1573: }
1.136 manu 1574: ((u_int16_t *)(tag + 1))[0] = sport;
1575: ((u_int16_t *)(tag + 1))[1] = dport;
1576: m_tag_prepend(n, tag);
1577:
1.147 christos 1578: #ifdef FAST_IPSEC
1.160 degroote 1579: ipsec4_common_input(n, iphdrlen, IPPROTO_ESP);
1.147 christos 1580: #else
1.130 manu 1581: esp4_input(n, iphdrlen);
1.147 christos 1582: #endif
1.130 manu 1583:
1584: /* We handled it, it shoudln't be handled by UDP */
1585: return 1;
1586: }
1587: #endif
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