Annotation of src/sys/netinet/udp_usrreq.c, Revision 1.179.6.1
1.179.6.1! jruoho 1: /* $NetBSD: udp_usrreq.c,v 1.180 2011/05/03 18:28:45 dyoung 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>
1.179.6.1! jruoho 64: __KERNEL_RCSID(0, "$NetBSD: udp_usrreq.c,v 1.180 2011/05/03 18:28:45 dyoung 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:
1.27 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:
1.174 christos 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:
1.179 pooka 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:
1.179 pooka 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:
1.175 cegger 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;
1.177 tsutsui 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;
1.175 cegger 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;
1.177 tsutsui 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: */
1.175 cegger 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;
1.175 cegger 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
1.174 christos 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
1.174 christos 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: */
1.179.6.1! jruoho 807: inp = in_pcblookup_connect(&udbtable, *src4, *sport, *dst4,
! 808: *dport, 0);
1.53 itojun 809: if (inp == 0) {
1.166 thorpej 810: UDP_STATINC(UDP_STAT_PCBHASHMISS);
1.53 itojun 811: inp = in_pcblookup_bind(&udbtable, *dst4, *dport);
1.82 itojun 812: if (inp == 0)
1.53 itojun 813: return rcvcnt;
814: }
815:
1.130 manu 816: #ifdef IPSEC_NAT_T
817: /* Handle ESP over UDP */
818: if (inp->inp_flags & INP_ESPINUDP_ALL) {
819: struct sockaddr *sa = (struct sockaddr *)src;
820:
1.144 manu 821: switch(udp4_espinudp(mp, off, sa, inp->inp_socket)) {
822: case -1: /* Error, m was freeed */
823: rcvcnt = -1;
824: goto bad;
825: break;
826:
827: case 1: /* ESP over UDP */
1.130 manu 828: rcvcnt++;
829: goto bad;
1.144 manu 830: break;
831:
832: case 0: /* plain UDP */
833: default: /* Unexpected */
834: /*
835: * Normal UDP processing will take place
836: * m may have changed.
837: */
838: m = *mp;
839: break;
1.130 manu 840: }
841: }
842: #endif
843:
1.178 minskim 844: /*
845: * Check the minimum TTL for socket.
846: */
847: if (mtod(m, struct ip *)->ip_ttl < inp->inp_ip_minttl)
848: goto bad;
849:
1.53 itojun 850: udp4_sendup(m, off, (struct sockaddr *)src, inp->inp_socket);
851: rcvcnt++;
852: }
853:
854: bad:
855: return rcvcnt;
856: }
1.72 itojun 857: #endif
1.53 itojun 858:
859: #ifdef INET6
860: static int
1.119 matt 861: udp6_realinput(int af, struct sockaddr_in6 *src, struct sockaddr_in6 *dst,
862: struct mbuf *m, int off)
1.53 itojun 863: {
1.79 itojun 864: u_int16_t sport, dport;
1.53 itojun 865: int rcvcnt;
1.146 rpaulo 866: struct in6_addr src6, *dst6;
1.79 itojun 867: const struct in_addr *dst4;
1.109 itojun 868: struct inpcb_hdr *inph;
1.53 itojun 869: struct in6pcb *in6p;
870:
871: rcvcnt = 0;
872: off += sizeof(struct udphdr); /* now, offset of payload */
873:
874: if (af != AF_INET && af != AF_INET6)
875: goto bad;
876: if (src->sin6_family != AF_INET6 || dst->sin6_family != AF_INET6)
877: goto bad;
878:
1.146 rpaulo 879: src6 = src->sin6_addr;
880: if (sa6_recoverscope(src) != 0) {
881: /* XXX: should be impossible. */
882: goto bad;
883: }
1.79 itojun 884: sport = src->sin6_port;
1.146 rpaulo 885:
1.79 itojun 886: dport = dst->sin6_port;
1.88 itojun 887: dst4 = (struct in_addr *)&dst->sin6_addr.s6_addr[12];
1.146 rpaulo 888: dst6 = &dst->sin6_addr;
1.53 itojun 889:
1.146 rpaulo 890: if (IN6_IS_ADDR_MULTICAST(dst6) ||
1.79 itojun 891: (af == AF_INET && IN_MULTICAST(dst4->s_addr))) {
1.53 itojun 892: /*
893: * Deliver a multicast or broadcast datagram to *all* sockets
894: * for which the local and remote addresses and ports match
895: * those of the incoming datagram. This allows more than
896: * one process to receive multi/broadcasts on the same port.
897: * (This really ought to be done for unicast datagrams as
898: * well, but that would cause problems with existing
899: * applications that open both address-specific sockets and
900: * a wildcard socket listening to the same port -- they would
901: * end up receiving duplicates of every unicast datagram.
902: * Those applications open the multiple sockets to overcome an
903: * inadequacy of the UDP socket interface, but for backwards
904: * compatibility we avoid the problem here rather than
905: * fixing the interface. Maybe 4.5BSD will remedy this?)
906: */
907:
908: /*
1.92 itojun 909: * KAME note: traditionally we dropped udpiphdr from mbuf here.
1.71 itojun 910: * we need udpiphdr for IPsec processing so we do that later.
1.53 itojun 911: */
912: /*
913: * Locate pcb(s) for datagram.
914: */
1.109 itojun 915: CIRCLEQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) {
916: in6p = (struct in6pcb *)inph;
917: if (in6p->in6p_af != AF_INET6)
918: continue;
919:
1.79 itojun 920: if (in6p->in6p_lport != dport)
1.53 itojun 921: continue;
922: if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
1.146 rpaulo 923: if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr,
924: dst6))
1.53 itojun 925: continue;
1.92 itojun 926: } else {
1.146 rpaulo 927: if (IN6_IS_ADDR_V4MAPPED(dst6) &&
1.85 itojun 928: (in6p->in6p_flags & IN6P_IPV6_V6ONLY))
1.55 itojun 929: continue;
930: }
1.53 itojun 931: if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
1.79 itojun 932: if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr,
933: &src6) || in6p->in6p_fport != sport)
1.53 itojun 934: continue;
1.92 itojun 935: } else {
1.79 itojun 936: if (IN6_IS_ADDR_V4MAPPED(&src6) &&
1.85 itojun 937: (in6p->in6p_flags & IN6P_IPV6_V6ONLY))
1.55 itojun 938: continue;
939: }
1.53 itojun 940:
941: udp6_sendup(m, off, (struct sockaddr *)src,
942: in6p->in6p_socket);
943: rcvcnt++;
944:
945: /*
946: * Don't look for additional matches if this one does
947: * not have either the SO_REUSEPORT or SO_REUSEADDR
948: * socket options set. This heuristic avoids searching
949: * through all pcbs in the common case of a non-shared
950: * port. It assumes that an application will never
951: * clear these options after setting them.
952: */
953: if ((in6p->in6p_socket->so_options &
954: (SO_REUSEPORT|SO_REUSEADDR)) == 0)
955: break;
956: }
957: } else {
958: /*
959: * Locate pcb for datagram.
960: */
1.146 rpaulo 961: in6p = in6_pcblookup_connect(&udbtable, &src6, sport, dst6,
1.179.6.1! jruoho 962: dport, 0, 0);
1.53 itojun 963: if (in6p == 0) {
1.166 thorpej 964: UDP_STATINC(UDP_STAT_PCBHASHMISS);
1.146 rpaulo 965: in6p = in6_pcblookup_bind(&udbtable, dst6, dport, 0);
1.82 itojun 966: if (in6p == 0)
1.53 itojun 967: return rcvcnt;
968: }
969:
970: udp6_sendup(m, off, (struct sockaddr *)src, in6p->in6p_socket);
971: rcvcnt++;
972: }
973:
974: bad:
975: return rcvcnt;
976: }
977: #endif
1.1 cgd 978:
1.72 itojun 979: #ifdef INET
1.1 cgd 980: /*
981: * Notify a udp user of an asynchronous error;
982: * just wake up so that he can collect error status.
983: */
1.7 mycroft 984: static void
1.119 matt 985: udp_notify(struct inpcb *inp, int errno)
1.1 cgd 986: {
987: inp->inp_socket->so_error = errno;
988: sorwakeup(inp->inp_socket);
989: sowwakeup(inp->inp_socket);
990: }
991:
1.27 christos 992: void *
1.157 dyoung 993: udp_ctlinput(int cmd, const struct sockaddr *sa, void *v)
1.1 cgd 994: {
1.66 augustss 995: struct ip *ip = v;
996: struct udphdr *uh;
1.119 matt 997: void (*notify)(struct inpcb *, int) = udp_notify;
1.21 mycroft 998: int errno;
1.1 cgd 999:
1.53 itojun 1000: if (sa->sa_family != AF_INET
1001: || sa->sa_len != sizeof(struct sockaddr_in))
1.51 itojun 1002: return NULL;
1.20 mycroft 1003: if ((unsigned)cmd >= PRC_NCMDS)
1.27 christos 1004: return NULL;
1.20 mycroft 1005: errno = inetctlerrmap[cmd];
1.18 mycroft 1006: if (PRC_IS_REDIRECT(cmd))
1.19 mycroft 1007: notify = in_rtchange, ip = 0;
1.18 mycroft 1008: else if (cmd == PRC_HOSTDEAD)
1.19 mycroft 1009: ip = 0;
1.23 cgd 1010: else if (errno == 0)
1.27 christos 1011: return NULL;
1.19 mycroft 1012: if (ip) {
1.158 christos 1013: uh = (struct udphdr *)((char *)ip + (ip->ip_hl << 2));
1.157 dyoung 1014: in_pcbnotify(&udbtable, satocsin(sa)->sin_addr, uh->uh_dport,
1.34 mycroft 1015: ip->ip_src, uh->uh_sport, errno, notify);
1.53 itojun 1016:
1017: /* XXX mapped address case */
1.19 mycroft 1018: } else
1.157 dyoung 1019: in_pcbnotifyall(&udbtable, satocsin(sa)->sin_addr, errno,
1.34 mycroft 1020: notify);
1.27 christos 1021: return NULL;
1.1 cgd 1022: }
1023:
1.7 mycroft 1024: int
1.173 plunky 1025: udp_ctloutput(int op, struct socket *so, struct sockopt *sopt)
1.130 manu 1026: {
1027: int s;
1028: int error = 0;
1029: struct inpcb *inp;
1030: int family;
1.173 plunky 1031: int optval;
1.130 manu 1032:
1033: family = so->so_proto->pr_domain->dom_family;
1034:
1035: s = splsoftnet();
1036: switch (family) {
1037: #ifdef INET
1038: case PF_INET:
1.173 plunky 1039: if (sopt->sopt_level != IPPROTO_UDP) {
1040: error = ip_ctloutput(op, so, sopt);
1.130 manu 1041: goto end;
1042: }
1043: break;
1044: #endif
1045: #ifdef INET6
1046: case PF_INET6:
1.173 plunky 1047: if (sopt->sopt_level != IPPROTO_UDP) {
1048: error = ip6_ctloutput(op, so, sopt);
1.130 manu 1049: goto end;
1050: }
1051: break;
1052: #endif
1053: default:
1054: error = EAFNOSUPPORT;
1055: goto end;
1056: }
1057:
1058:
1059: switch (op) {
1060: case PRCO_SETOPT:
1061: inp = sotoinpcb(so);
1062:
1.173 plunky 1063: switch (sopt->sopt_name) {
1.130 manu 1064: case UDP_ENCAP:
1.173 plunky 1065: error = sockopt_getint(sopt, &optval);
1066: if (error)
1.153 yamt 1067: break;
1.131 perry 1068:
1.173 plunky 1069: switch(optval) {
1.130 manu 1070: #ifdef IPSEC_NAT_T
1071: case 0:
1072: inp->inp_flags &= ~INP_ESPINUDP_ALL;
1073: break;
1074:
1075: case UDP_ENCAP_ESPINUDP:
1076: inp->inp_flags &= ~INP_ESPINUDP_ALL;
1077: inp->inp_flags |= INP_ESPINUDP;
1078: break;
1.131 perry 1079:
1.130 manu 1080: case UDP_ENCAP_ESPINUDP_NON_IKE:
1081: inp->inp_flags &= ~INP_ESPINUDP_ALL;
1082: inp->inp_flags |= INP_ESPINUDP_NON_IKE;
1083: break;
1084: #endif
1085: default:
1086: error = EINVAL;
1087: break;
1088: }
1089: break;
1090:
1091: default:
1092: error = ENOPROTOOPT;
1093: break;
1094: }
1095: break;
1096:
1097: default:
1098: error = EINVAL;
1099: break;
1.131 perry 1100: }
1101:
1.130 manu 1102: end:
1103: splx(s);
1104: return error;
1105: }
1.131 perry 1106:
1.130 manu 1107:
1108: int
1.27 christos 1109: udp_output(struct mbuf *m, ...)
1110: {
1.66 augustss 1111: struct inpcb *inp;
1112: struct udpiphdr *ui;
1.125 thorpej 1113: struct route *ro;
1.66 augustss 1114: int len = m->m_pkthdr.len;
1.31 mycroft 1115: int error = 0;
1.27 christos 1116: va_list ap;
1117:
1.98 matt 1118: MCLAIM(m, &udp_tx_mowner);
1.27 christos 1119: va_start(ap, m);
1120: inp = va_arg(ap, struct inpcb *);
1121: va_end(ap);
1.1 cgd 1122:
1123: /*
1124: * Calculate data length and get a mbuf
1125: * for UDP and IP headers.
1126: */
1.13 mycroft 1127: M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT);
1128: if (m == 0) {
1129: error = ENOBUFS;
1.39 thorpej 1130: goto release;
1131: }
1132:
1133: /*
1134: * Compute the packet length of the IP header, and
1135: * punt if the length looks bogus.
1136: */
1.96 itojun 1137: if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) {
1.39 thorpej 1138: error = EMSGSIZE;
1.13 mycroft 1139: goto release;
1140: }
1.1 cgd 1141:
1142: /*
1143: * Fill in mbuf with extended UDP header
1144: * and addresses and length put into network format.
1145: */
1146: ui = mtod(m, struct udpiphdr *);
1147: ui->ui_pr = IPPROTO_UDP;
1148: ui->ui_src = inp->inp_laddr;
1149: ui->ui_dst = inp->inp_faddr;
1150: ui->ui_sport = inp->inp_lport;
1151: ui->ui_dport = inp->inp_fport;
1.78 thorpej 1152: ui->ui_ulen = htons((u_int16_t)len + sizeof(struct udphdr));
1.1 cgd 1153:
1.125 thorpej 1154: ro = &inp->inp_route;
1155:
1.1 cgd 1156: /*
1.78 thorpej 1157: * Set up checksum and output datagram.
1.1 cgd 1158: */
1159: if (udpcksum) {
1.78 thorpej 1160: /*
1161: * XXX Cache pseudo-header checksum part for
1162: * XXX "connected" UDP sockets.
1163: */
1164: ui->ui_sum = in_cksum_phdr(ui->ui_src.s_addr,
1165: ui->ui_dst.s_addr, htons((u_int16_t)len +
1166: sizeof(struct udphdr) + IPPROTO_UDP));
1.135 yamt 1167: m->m_pkthdr.csum_flags = M_CSUM_UDPv4;
1.78 thorpej 1168: m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
1169: } else
1170: ui->ui_sum = 0;
1.96 itojun 1171: ((struct ip *)ui)->ip_len = htons(sizeof (struct udpiphdr) + len);
1.1 cgd 1172: ((struct ip *)ui)->ip_ttl = inp->inp_ip.ip_ttl; /* XXX */
1173: ((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; /* XXX */
1.166 thorpej 1174: UDP_STATINC(UDP_STAT_OPACKETS);
1.48 itojun 1175:
1.125 thorpej 1176: return (ip_output(m, inp->inp_options, ro,
1.12 mycroft 1177: inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST),
1.107 itojun 1178: inp->inp_moptions, inp->inp_socket));
1.1 cgd 1179:
1180: release:
1181: m_freem(m);
1182: return (error);
1183: }
1184:
1.42 thorpej 1185: int udp_sendspace = 9216; /* really max datagram size */
1186: int udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in));
1.1 cgd 1187: /* 40 1K datagrams */
1188:
1189: /*ARGSUSED*/
1.7 mycroft 1190: int
1.119 matt 1191: udp_usrreq(struct socket *so, int req, struct mbuf *m, struct mbuf *nam,
1.145 christos 1192: struct mbuf *control, struct lwp *l)
1.1 cgd 1193: {
1.66 augustss 1194: struct inpcb *inp;
1.1 cgd 1195: int s;
1.66 augustss 1196: int error = 0;
1.1 cgd 1197:
1198: if (req == PRU_CONTROL)
1.158 christos 1199: return (in_control(so, (long)m, (void *)nam,
1.148 ad 1200: (struct ifnet *)control, l));
1.59 thorpej 1201:
1.149 tls 1202: s = splsoftnet();
1203:
1.60 thorpej 1204: if (req == PRU_PURGEIF) {
1.170 ad 1205: mutex_enter(softnet_lock);
1.80 itojun 1206: in_pcbpurgeif0(&udbtable, (struct ifnet *)control);
1.60 thorpej 1207: in_purgeif((struct ifnet *)control);
1208: in_pcbpurgeif(&udbtable, (struct ifnet *)control);
1.170 ad 1209: mutex_exit(softnet_lock);
1.149 tls 1210: splx(s);
1.59 thorpej 1211: return (0);
1212: }
1.31 mycroft 1213:
1214: inp = sotoinpcb(so);
1.32 mycroft 1215: #ifdef DIAGNOSTIC
1216: if (req != PRU_SEND && req != PRU_SENDOOB && control)
1217: panic("udp_usrreq: unexpected control mbuf");
1218: #endif
1.170 ad 1219: if (req == PRU_ATTACH) {
1220: sosetlock(so);
1221: } else if (inp == 0) {
1.31 mycroft 1222: error = EINVAL;
1223: goto release;
1224: }
1225:
1.1 cgd 1226: /*
1227: * Note: need to block udp_input while changing
1228: * the udp pcb queue and/or pcb addresses.
1229: */
1230: switch (req) {
1231:
1232: case PRU_ATTACH:
1.31 mycroft 1233: if (inp != 0) {
1234: error = EISCONN;
1.1 cgd 1235: break;
1236: }
1.98 matt 1237: #ifdef MBUFTRACE
1238: so->so_mowner = &udp_mowner;
1239: so->so_rcv.sb_mowner = &udp_rx_mowner;
1240: so->so_snd.sb_mowner = &udp_tx_mowner;
1241: #endif
1.31 mycroft 1242: if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
1243: error = soreserve(so, udp_sendspace, udp_recvspace);
1244: if (error)
1245: break;
1246: }
1.18 mycroft 1247: error = in_pcballoc(so, &udbtable);
1.1 cgd 1248: if (error)
1249: break;
1.31 mycroft 1250: inp = sotoinpcb(so);
1251: inp->inp_ip.ip_ttl = ip_defttl;
1.1 cgd 1252: break;
1253:
1254: case PRU_DETACH:
1.31 mycroft 1255: in_pcbdetach(inp);
1.1 cgd 1256: break;
1257:
1258: case PRU_BIND:
1.148 ad 1259: error = in_pcbbind(inp, nam, l);
1.1 cgd 1260: break;
1261:
1262: case PRU_LISTEN:
1263: error = EOPNOTSUPP;
1264: break;
1265:
1266: case PRU_CONNECT:
1.148 ad 1267: error = in_pcbconnect(inp, nam, l);
1.31 mycroft 1268: if (error)
1.1 cgd 1269: break;
1.31 mycroft 1270: soisconnected(so);
1.1 cgd 1271: break;
1272:
1273: case PRU_CONNECT2:
1274: error = EOPNOTSUPP;
1275: break;
1276:
1277: case PRU_DISCONNECT:
1.31 mycroft 1278: /*soisdisconnected(so);*/
1279: so->so_state &= ~SS_ISCONNECTED; /* XXX */
1.1 cgd 1280: in_pcbdisconnect(inp);
1.34 mycroft 1281: inp->inp_laddr = zeroin_addr; /* XXX */
1.35 mycroft 1282: in_pcbstate(inp, INP_BOUND); /* XXX */
1.1 cgd 1283: break;
1284:
1285: case PRU_SHUTDOWN:
1286: socantsendmore(so);
1287: break;
1288:
1.31 mycroft 1289: case PRU_RCVD:
1290: error = EOPNOTSUPP;
1.1 cgd 1291: break;
1292:
1.31 mycroft 1293: case PRU_SEND:
1.32 mycroft 1294: if (control && control->m_len) {
1295: m_freem(control);
1296: m_freem(m);
1297: error = EINVAL;
1298: break;
1299: }
1.31 mycroft 1300: {
1.35 mycroft 1301: struct in_addr laddr; /* XXX */
1.1 cgd 1302:
1.31 mycroft 1303: if (nam) {
1.35 mycroft 1304: laddr = inp->inp_laddr; /* XXX */
1.31 mycroft 1305: if ((so->so_state & SS_ISCONNECTED) != 0) {
1306: error = EISCONN;
1.32 mycroft 1307: goto die;
1.31 mycroft 1308: }
1.148 ad 1309: error = in_pcbconnect(inp, nam, l);
1.100 matt 1310: if (error)
1311: goto die;
1.31 mycroft 1312: } else {
1313: if ((so->so_state & SS_ISCONNECTED) == 0) {
1314: error = ENOTCONN;
1.32 mycroft 1315: goto die;
1.31 mycroft 1316: }
1317: }
1.33 mycroft 1318: error = udp_output(m, inp);
1.100 matt 1319: m = NULL;
1.31 mycroft 1320: if (nam) {
1321: in_pcbdisconnect(inp);
1.35 mycroft 1322: inp->inp_laddr = laddr; /* XXX */
1323: in_pcbstate(inp, INP_BOUND); /* XXX */
1.31 mycroft 1324: }
1.100 matt 1325: die:
1326: if (m)
1327: m_freem(m);
1.31 mycroft 1328: }
1.1 cgd 1329: break;
1330:
1331: case PRU_SENSE:
1332: /*
1333: * stat: don't bother with a blocksize.
1334: */
1.31 mycroft 1335: splx(s);
1.1 cgd 1336: return (0);
1337:
1.31 mycroft 1338: case PRU_RCVOOB:
1339: error = EOPNOTSUPP;
1340: break;
1341:
1.1 cgd 1342: case PRU_SENDOOB:
1.32 mycroft 1343: m_freem(control);
1.31 mycroft 1344: m_freem(m);
1.1 cgd 1345: error = EOPNOTSUPP;
1346: break;
1347:
1.31 mycroft 1348: case PRU_SOCKADDR:
1349: in_setsockaddr(inp, nam);
1350: break;
1351:
1352: case PRU_PEERADDR:
1353: in_setpeeraddr(inp, nam);
1354: break;
1.1 cgd 1355:
1356: default:
1357: panic("udp_usrreq");
1358: }
1359:
1360: release:
1.31 mycroft 1361: splx(s);
1.1 cgd 1362: return (error);
1.13 mycroft 1363: }
1364:
1.166 thorpej 1365: static int
1366: sysctl_net_inet_udp_stats(SYSCTLFN_ARGS)
1367: {
1368:
1.172 thorpej 1369: return (NETSTAT_SYSCTL(udpstat_percpu, UDP_NSTATS));
1.166 thorpej 1370: }
1371:
1.13 mycroft 1372: /*
1373: * Sysctl for udp variables.
1374: */
1.179 pooka 1375: static void
1376: sysctl_net_inet_udp_setup(struct sysctllog **clog)
1.13 mycroft 1377: {
1.114 atatat 1378:
1.116 atatat 1379: sysctl_createv(clog, 0, NULL, NULL,
1380: CTLFLAG_PERMANENT,
1.114 atatat 1381: CTLTYPE_NODE, "net", NULL,
1382: NULL, 0, NULL, 0,
1383: CTL_NET, CTL_EOL);
1.116 atatat 1384: sysctl_createv(clog, 0, NULL, NULL,
1385: CTLFLAG_PERMANENT,
1.114 atatat 1386: CTLTYPE_NODE, "inet", NULL,
1387: NULL, 0, NULL, 0,
1388: CTL_NET, PF_INET, CTL_EOL);
1.116 atatat 1389: sysctl_createv(clog, 0, NULL, NULL,
1390: CTLFLAG_PERMANENT,
1.122 atatat 1391: CTLTYPE_NODE, "udp",
1392: SYSCTL_DESCR("UDPv4 related settings"),
1.114 atatat 1393: NULL, 0, NULL, 0,
1394: CTL_NET, PF_INET, IPPROTO_UDP, CTL_EOL);
1395:
1.116 atatat 1396: sysctl_createv(clog, 0, NULL, NULL,
1397: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122 atatat 1398: CTLTYPE_INT, "checksum",
1.123 heas 1399: SYSCTL_DESCR("Compute UDP checksums"),
1.114 atatat 1400: NULL, 0, &udpcksum, 0,
1401: CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_CHECKSUM,
1402: CTL_EOL);
1.116 atatat 1403: sysctl_createv(clog, 0, NULL, NULL,
1404: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122 atatat 1405: CTLTYPE_INT, "sendspace",
1406: SYSCTL_DESCR("Default UDP send buffer size"),
1.114 atatat 1407: NULL, 0, &udp_sendspace, 0,
1408: CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_SENDSPACE,
1409: CTL_EOL);
1.116 atatat 1410: sysctl_createv(clog, 0, NULL, NULL,
1411: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122 atatat 1412: CTLTYPE_INT, "recvspace",
1413: SYSCTL_DESCR("Default UDP receive buffer size"),
1.114 atatat 1414: NULL, 0, &udp_recvspace, 0,
1415: CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_RECVSPACE,
1416: CTL_EOL);
1.125 thorpej 1417: sysctl_createv(clog, 0, NULL, NULL,
1418: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1419: CTLTYPE_INT, "do_loopback_cksum",
1420: SYSCTL_DESCR("Perform UDP checksum on loopback"),
1421: NULL, 0, &udp_do_loopback_cksum, 0,
1422: CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_LOOPBACKCKSUM,
1423: CTL_EOL);
1.132 atatat 1424: sysctl_createv(clog, 0, NULL, NULL,
1425: CTLFLAG_PERMANENT,
1.134 atatat 1426: CTLTYPE_STRUCT, "pcblist",
1.132 atatat 1427: SYSCTL_DESCR("UDP protocol control block list"),
1428: sysctl_inpcblist, 0, &udbtable, 0,
1429: CTL_NET, PF_INET, IPPROTO_UDP, CTL_CREATE,
1430: CTL_EOL);
1.139 elad 1431: sysctl_createv(clog, 0, NULL, NULL,
1432: CTLFLAG_PERMANENT,
1433: CTLTYPE_STRUCT, "stats",
1434: SYSCTL_DESCR("UDP statistics"),
1.166 thorpej 1435: sysctl_net_inet_udp_stats, 0, NULL, 0,
1.139 elad 1436: CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_STATS,
1437: CTL_EOL);
1.1 cgd 1438: }
1.72 itojun 1439: #endif
1.130 manu 1440:
1.166 thorpej 1441: void
1442: udp_statinc(u_int stat)
1443: {
1444:
1445: KASSERT(stat < UDP_NSTATS);
1446: UDP_STATINC(stat);
1447: }
1448:
1.130 manu 1449: #if (defined INET && defined IPSEC_NAT_T)
1450: /*
1451: * Returns:
1452: * 1 if the packet was processed
1453: * 0 if normal UDP processing should take place
1.144 manu 1454: * -1 if an error occurent and m was freed
1.130 manu 1455: */
1456: static int
1.154 yamt 1457: udp4_espinudp(struct mbuf **mp, int off, struct sockaddr *src,
1.151 christos 1458: struct socket *so)
1.130 manu 1459: {
1460: size_t len;
1.158 christos 1461: void *data;
1.130 manu 1462: struct inpcb *inp;
1463: size_t skip = 0;
1464: size_t minlen;
1465: size_t iphdrlen;
1466: struct ip *ip;
1467: struct mbuf *n;
1.136 manu 1468: struct m_tag *tag;
1469: struct udphdr *udphdr;
1470: u_int16_t sport, dport;
1.144 manu 1471: struct mbuf *m = *mp;
1.130 manu 1472:
1.131 perry 1473: /*
1.130 manu 1474: * Collapse the mbuf chain if the first mbuf is too short
1475: * The longest case is: UDP + non ESP marker + ESP
1476: */
1477: minlen = off + sizeof(u_int64_t) + sizeof(struct esp);
1478: if (minlen > m->m_pkthdr.len)
1479: minlen = m->m_pkthdr.len;
1480:
1481: if (m->m_len < minlen) {
1.144 manu 1482: if ((*mp = m_pullup(m, minlen)) == NULL) {
1.130 manu 1483: printf("udp4_espinudp: m_pullup failed\n");
1.144 manu 1484: return -1;
1.130 manu 1485: }
1.144 manu 1486: m = *mp;
1.130 manu 1487: }
1488:
1.131 perry 1489: len = m->m_len - off;
1.158 christos 1490: data = mtod(m, char *) + off;
1.130 manu 1491: inp = sotoinpcb(so);
1492:
1493: /* Ignore keepalive packets */
1.158 christos 1494: if ((len == 1) && (*(unsigned char *)data == 0xff)) {
1.130 manu 1495: return 1;
1496: }
1497:
1.131 perry 1498: /*
1499: * Check that the payload is long enough to hold
1.130 manu 1500: * an ESP header and compute the length of encapsulation
1.131 perry 1501: * header to remove
1.130 manu 1502: */
1503: if (inp->inp_flags & INP_ESPINUDP) {
1504: u_int32_t *st = (u_int32_t *)data;
1505:
1506: if ((len <= sizeof(struct esp)) || (*st == 0))
1507: return 0; /* Normal UDP processing */
1508:
1509: skip = sizeof(struct udphdr);
1510: }
1511:
1512: if (inp->inp_flags & INP_ESPINUDP_NON_IKE) {
1.142 kleink 1513: u_int32_t *st = (u_int32_t *)data;
1.130 manu 1514:
1515: if ((len <= sizeof(u_int64_t) + sizeof(struct esp))
1.142 kleink 1516: || ((st[0] | st[1]) != 0))
1.130 manu 1517: return 0; /* Normal UDP processing */
1.131 perry 1518:
1.130 manu 1519: skip = sizeof(struct udphdr) + sizeof(u_int64_t);
1520: }
1521:
1522: /*
1.136 manu 1523: * Get the UDP ports. They are handled in network
1524: * order everywhere in IPSEC_NAT_T code.
1525: */
1.158 christos 1526: udphdr = (struct udphdr *)((char *)data - skip);
1.136 manu 1527: sport = udphdr->uh_sport;
1528: dport = udphdr->uh_dport;
1529:
1530: /*
1.130 manu 1531: * Remove the UDP header (and possibly the non ESP marker)
1532: * IP header lendth is iphdrlen
1.131 perry 1533: * Before:
1.130 manu 1534: * <--- off --->
1535: * +----+------+-----+
1536: * | IP | UDP | ESP |
1537: * +----+------+-----+
1538: * <-skip->
1539: * After:
1540: * +----+-----+
1541: * | IP | ESP |
1542: * +----+-----+
1543: * <-skip->
1544: */
1545: iphdrlen = off - sizeof(struct udphdr);
1.158 christos 1546: memmove(mtod(m, char *) + skip, mtod(m, void *), iphdrlen);
1.130 manu 1547: m_adj(m, skip);
1548:
1549: ip = mtod(m, struct ip *);
1550: ip->ip_len = htons(ntohs(ip->ip_len) - skip);
1551: ip->ip_p = IPPROTO_ESP;
1552:
1553: /*
1.131 perry 1554: * Copy the mbuf to avoid multiple free, as both
1555: * esp4_input (which we call) and udp_input (which
1.130 manu 1556: * called us) free the mbuf.
1557: */
1558: if ((n = m_dup(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
1559: printf("udp4_espinudp: m_dup failed\n");
1560: return 0;
1561: }
1562:
1.136 manu 1563: /*
1564: * Add a PACKET_TAG_IPSEC_NAT_T_PORT tag to remember
1565: * the source UDP port. This is required if we want
1566: * to select the right SPD for multiple hosts behind
1567: * same NAT
1568: */
1.137 manu 1569: if ((tag = m_tag_get(PACKET_TAG_IPSEC_NAT_T_PORTS,
1570: sizeof(sport) + sizeof(dport), M_DONTWAIT)) == NULL) {
1571: printf("udp4_espinudp: m_tag_get failed\n");
1.138 manu 1572: m_freem(n);
1.137 manu 1573: return 0;
1574: }
1.136 manu 1575: ((u_int16_t *)(tag + 1))[0] = sport;
1576: ((u_int16_t *)(tag + 1))[1] = dport;
1577: m_tag_prepend(n, tag);
1578:
1.147 christos 1579: #ifdef FAST_IPSEC
1.160 degroote 1580: ipsec4_common_input(n, iphdrlen, IPPROTO_ESP);
1.147 christos 1581: #else
1.130 manu 1582: esp4_input(n, iphdrlen);
1.147 christos 1583: #endif
1.130 manu 1584:
1585: /* We handled it, it shoudln't be handled by UDP */
1586: return 1;
1587: }
1588: #endif
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