Annotation of src/sys/netinet/udp_usrreq.c, Revision 1.145
1.145 ! christos 1: /* $NetBSD: udp_usrreq.c,v 1.144 2005/12/09 15:36:34 manu 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>
1.145 ! christos 64: __KERNEL_RCSID(0, "$NetBSD: udp_usrreq.c,v 1.144 2005/12/09 15:36:34 manu Exp $");
1.50 thorpej 65:
1.77 soda 66: #include "opt_inet.h"
1.50 thorpej 67: #include "opt_ipsec.h"
1.78 thorpej 68: #include "opt_inet_csum.h"
1.64 ws 69: #include "opt_ipkdb.h"
1.101 martin 70: #include "opt_mbuftrace.h"
1.1 cgd 71:
1.5 mycroft 72: #include <sys/param.h>
73: #include <sys/malloc.h>
74: #include <sys/mbuf.h>
75: #include <sys/protosw.h>
76: #include <sys/socket.h>
77: #include <sys/socketvar.h>
1.13 mycroft 78: #include <sys/errno.h>
1.5 mycroft 79: #include <sys/stat.h>
1.27 christos 80: #include <sys/systm.h>
81: #include <sys/proc.h>
1.53 itojun 82: #include <sys/domain.h>
1.27 christos 83: #include <sys/sysctl.h>
1.1 cgd 84:
1.5 mycroft 85: #include <net/if.h>
86: #include <net/route.h>
1.1 cgd 87:
1.5 mycroft 88: #include <netinet/in.h>
89: #include <netinet/in_systm.h>
1.15 cgd 90: #include <netinet/in_var.h>
1.5 mycroft 91: #include <netinet/ip.h>
92: #include <netinet/in_pcb.h>
93: #include <netinet/ip_var.h>
94: #include <netinet/ip_icmp.h>
95: #include <netinet/udp.h>
96: #include <netinet/udp_var.h>
1.1 cgd 97:
1.130 manu 98: #ifdef IPSEC_NAT_T
99: #include <netinet6/ipsec.h>
100: #include <netinet6/esp.h>
101: #endif
102:
1.53 itojun 103: #ifdef INET6
104: #include <netinet/ip6.h>
105: #include <netinet/icmp6.h>
106: #include <netinet6/ip6_var.h>
107: #include <netinet6/in6_pcb.h>
108: #include <netinet6/udp6_var.h>
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>
1.121 jonathan 125: #include <netipsec/ipsec_var.h> /* XXX ipsecstat namespace */
1.105 jonathan 126: #ifdef INET6
127: #include <netipsec/ipsec6.h>
128: #endif
129: #endif /* FAST_IPSEC*/
130:
1.48 itojun 131: #ifdef IPSEC
132: #include <netinet6/ipsec.h>
133: #include <netkey/key.h>
134: #endif /*IPSEC*/
135:
1.64 ws 136: #ifdef IPKDB
137: #include <ipkdb/ipkdb.h>
138: #endif
139:
1.8 mycroft 140: /*
141: * UDP protocol implementation.
142: * Per RFC 768, August, 1980.
143: */
144: #ifndef COMPAT_42
145: int udpcksum = 1;
146: #else
147: int udpcksum = 0; /* XXX */
148: #endif
1.141 yamt 149: int udp_do_loopback_cksum = 0;
1.93 matt 150:
151: struct inpcbtable udbtable;
152: struct udpstat udpstat;
1.8 mycroft 153:
1.72 itojun 154: #ifdef INET
1.130 manu 155: #ifdef IPSEC_NAT_T
1.144 manu 156: static int udp4_espinudp (struct mbuf **, int, struct sockaddr *,
1.130 manu 157: struct socket *);
158: #endif
1.119 matt 159: static void udp4_sendup (struct mbuf *, int, struct sockaddr *,
160: struct socket *);
161: static int udp4_realinput (struct sockaddr_in *, struct sockaddr_in *,
1.144 manu 162: struct mbuf **, int);
1.129 yamt 163: static int udp4_input_checksum(struct mbuf *, const struct udphdr *, int, int);
1.72 itojun 164: #endif
1.53 itojun 165: #ifdef INET6
1.119 matt 166: static void udp6_sendup (struct mbuf *, int, struct sockaddr *,
167: struct socket *);
168: static int udp6_realinput (int, struct sockaddr_in6 *,
169: struct sockaddr_in6 *, struct mbuf *, int);
1.129 yamt 170: static int udp6_input_checksum(struct mbuf *, const struct udphdr *, int, int);
1.53 itojun 171: #endif
1.72 itojun 172: #ifdef INET
1.119 matt 173: static void udp_notify (struct inpcb *, int);
1.72 itojun 174: #endif
1.7 mycroft 175:
1.26 mycroft 176: #ifndef UDBHASHSIZE
177: #define UDBHASHSIZE 128
178: #endif
179: int udbhashsize = UDBHASHSIZE;
180:
1.98 matt 181: #ifdef MBUFTRACE
182: struct mowner udp_mowner = { "udp" };
183: struct mowner udp_rx_mowner = { "udp", "rx" };
184: struct mowner udp_tx_mowner = { "udp", "tx" };
185: #endif
186:
1.78 thorpej 187: #ifdef UDP_CSUM_COUNTERS
188: #include <sys/device.h>
189:
1.140 yamt 190: #if defined(INET)
1.78 thorpej 191: struct evcnt udp_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
192: NULL, "udp", "hwcsum bad");
193: struct evcnt udp_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
194: NULL, "udp", "hwcsum ok");
195: struct evcnt udp_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
196: NULL, "udp", "hwcsum data");
197: struct evcnt udp_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
198: NULL, "udp", "swcsum");
199:
1.120 matt 200: EVCNT_ATTACH_STATIC(udp_hwcsum_bad);
201: EVCNT_ATTACH_STATIC(udp_hwcsum_ok);
202: EVCNT_ATTACH_STATIC(udp_hwcsum_data);
203: EVCNT_ATTACH_STATIC(udp_swcsum);
1.140 yamt 204: #endif /* defined(INET) */
205:
206: #if defined(INET6)
207: struct evcnt udp6_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
208: NULL, "udp6", "hwcsum bad");
209: struct evcnt udp6_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
210: NULL, "udp6", "hwcsum ok");
211: struct evcnt udp6_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
212: NULL, "udp6", "hwcsum data");
213: struct evcnt udp6_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
214: NULL, "udp6", "swcsum");
215:
216: EVCNT_ATTACH_STATIC(udp6_hwcsum_bad);
217: EVCNT_ATTACH_STATIC(udp6_hwcsum_ok);
218: EVCNT_ATTACH_STATIC(udp6_hwcsum_data);
219: EVCNT_ATTACH_STATIC(udp6_swcsum);
220: #endif /* defined(INET6) */
221:
222: #define UDP_CSUM_COUNTER_INCR(ev) (ev)->ev_count++
1.120 matt 223:
1.78 thorpej 224: #else
225:
226: #define UDP_CSUM_COUNTER_INCR(ev) /* nothing */
227:
228: #endif /* UDP_CSUM_COUNTERS */
229:
1.7 mycroft 230: void
1.119 matt 231: udp_init(void)
1.1 cgd 232: {
1.18 mycroft 233:
1.35 mycroft 234: in_pcbinit(&udbtable, udbhashsize, udbhashsize);
1.78 thorpej 235:
1.98 matt 236: MOWNER_ATTACH(&udp_tx_mowner);
237: MOWNER_ATTACH(&udp_rx_mowner);
238: MOWNER_ATTACH(&udp_mowner);
1.1 cgd 239: }
240:
1.129 yamt 241: /*
242: * Checksum extended UDP header and data.
243: */
244:
245: int
246: udp_input_checksum(int af, struct mbuf *m, const struct udphdr *uh,
247: int iphlen, int len)
248: {
249:
250: switch (af) {
1.72 itojun 251: #ifdef INET
1.129 yamt 252: case AF_INET:
253: return udp4_input_checksum(m, uh, iphlen, len);
254: #endif
255: #ifdef INET6
256: case AF_INET6:
257: return udp6_input_checksum(m, uh, iphlen, len);
258: #endif
259: }
260: #ifdef DIAGNOSTIC
261: panic("udp_input_checksum: unknown af %d", af);
262: #endif
263: /* NOTREACHED */
264: return -1;
265: }
266:
267: #ifdef INET
268:
269: /*
270: * Checksum extended UDP header and data.
271: */
272:
273: static int
274: udp4_input_checksum(struct mbuf *m, const struct udphdr *uh,
275: int iphlen, int len)
276: {
277:
278: /*
279: * XXX it's better to record and check if this mbuf is
280: * already checked.
281: */
282:
283: if (uh->uh_sum == 0)
284: return 0;
285:
286: switch (m->m_pkthdr.csum_flags &
287: ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv4) |
288: M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) {
289: case M_CSUM_UDPv4|M_CSUM_TCP_UDP_BAD:
290: UDP_CSUM_COUNTER_INCR(&udp_hwcsum_bad);
291: goto badcsum;
292:
293: case M_CSUM_UDPv4|M_CSUM_DATA: {
294: u_int32_t hw_csum = m->m_pkthdr.csum_data;
295:
296: UDP_CSUM_COUNTER_INCR(&udp_hwcsum_data);
297: if (m->m_pkthdr.csum_flags & M_CSUM_NO_PSEUDOHDR) {
298: const struct ip *ip =
299: mtod(m, const struct ip *);
300:
301: hw_csum = in_cksum_phdr(ip->ip_src.s_addr,
302: ip->ip_dst.s_addr,
303: htons(hw_csum + len + IPPROTO_UDP));
304: }
305: if ((hw_csum ^ 0xffff) != 0)
306: goto badcsum;
307: break;
308: }
309:
310: case M_CSUM_UDPv4:
311: /* Checksum was okay. */
312: UDP_CSUM_COUNTER_INCR(&udp_hwcsum_ok);
313: break;
314:
315: default:
316: /*
317: * Need to compute it ourselves. Maybe skip checksum
318: * on loopback interfaces.
319: */
320: if (__predict_true(!(m->m_pkthdr.rcvif->if_flags &
321: IFF_LOOPBACK) ||
322: udp_do_loopback_cksum)) {
323: UDP_CSUM_COUNTER_INCR(&udp_swcsum);
324: if (in4_cksum(m, IPPROTO_UDP, iphlen, len) != 0)
325: goto badcsum;
326: }
327: break;
328: }
329:
330: return 0;
331:
332: badcsum:
333: udpstat.udps_badsum++;
334: return -1;
335: }
336:
1.7 mycroft 337: void
1.27 christos 338: udp_input(struct mbuf *m, ...)
1.1 cgd 339: {
1.53 itojun 340: va_list ap;
341: struct sockaddr_in src, dst;
342: struct ip *ip;
343: struct udphdr *uh;
1.97 simonb 344: int iphlen;
1.53 itojun 345: int len;
346: int n;
1.96 itojun 347: u_int16_t ip_len;
1.53 itojun 348:
349: va_start(ap, m);
350: iphlen = va_arg(ap, int);
1.97 simonb 351: (void)va_arg(ap, int); /* ignore value, advance ap */
1.53 itojun 352: va_end(ap);
353:
1.98 matt 354: MCLAIM(m, &udp_rx_mowner);
1.53 itojun 355: udpstat.udps_ipackets++;
356:
357: /*
358: * Get IP and UDP header together in first mbuf.
359: */
360: ip = mtod(m, struct ip *);
361: IP6_EXTHDR_GET(uh, struct udphdr *, m, iphlen, sizeof(struct udphdr));
362: if (uh == NULL) {
363: udpstat.udps_hdrops++;
364: return;
365: }
1.95 thorpej 366: KASSERT(UDP_HDR_ALIGNED_P(uh));
1.53 itojun 367:
1.57 itojun 368: /* destination port of 0 is illegal, based on RFC768. */
369: if (uh->uh_dport == 0)
370: goto bad;
371:
1.53 itojun 372: /*
373: * Make mbuf data length reflect UDP length.
374: * If not enough data to reflect UDP length, drop.
375: */
1.96 itojun 376: ip_len = ntohs(ip->ip_len);
1.53 itojun 377: len = ntohs((u_int16_t)uh->uh_ulen);
1.96 itojun 378: if (ip_len != iphlen + len) {
379: if (ip_len < iphlen + len || len < sizeof(struct udphdr)) {
1.53 itojun 380: udpstat.udps_badlen++;
381: goto bad;
382: }
1.96 itojun 383: m_adj(m, iphlen + len - ip_len);
1.53 itojun 384: }
385:
386: /*
387: * Checksum extended UDP header and data.
388: */
1.129 yamt 389: if (udp4_input_checksum(m, uh, iphlen, len))
390: goto badcsum;
1.53 itojun 391:
392: /* construct source and dst sockaddrs. */
393: bzero(&src, sizeof(src));
394: src.sin_family = AF_INET;
395: src.sin_len = sizeof(struct sockaddr_in);
396: bcopy(&ip->ip_src, &src.sin_addr, sizeof(src.sin_addr));
397: src.sin_port = uh->uh_sport;
398: bzero(&dst, sizeof(dst));
399: dst.sin_family = AF_INET;
400: dst.sin_len = sizeof(struct sockaddr_in);
401: bcopy(&ip->ip_dst, &dst.sin_addr, sizeof(dst.sin_addr));
402: dst.sin_port = uh->uh_dport;
403:
1.144 manu 404: if ((n = udp4_realinput(&src, &dst, &m, iphlen)) == -1) {
405: udpstat.udps_hdrops++;
406: return;
407: }
1.53 itojun 408: #ifdef INET6
409: if (IN_MULTICAST(ip->ip_dst.s_addr) || n == 0) {
410: struct sockaddr_in6 src6, dst6;
411:
412: bzero(&src6, sizeof(src6));
413: src6.sin6_family = AF_INET6;
414: src6.sin6_len = sizeof(struct sockaddr_in6);
415: src6.sin6_addr.s6_addr[10] = src6.sin6_addr.s6_addr[11] = 0xff;
416: bcopy(&ip->ip_src, &src6.sin6_addr.s6_addr[12],
417: sizeof(ip->ip_src));
418: src6.sin6_port = uh->uh_sport;
419: bzero(&dst6, sizeof(dst6));
420: dst6.sin6_family = AF_INET6;
421: dst6.sin6_len = sizeof(struct sockaddr_in6);
422: dst6.sin6_addr.s6_addr[10] = dst6.sin6_addr.s6_addr[11] = 0xff;
423: bcopy(&ip->ip_dst, &dst6.sin6_addr.s6_addr[12],
424: sizeof(ip->ip_dst));
425: dst6.sin6_port = uh->uh_dport;
426:
427: n += udp6_realinput(AF_INET, &src6, &dst6, m, iphlen);
428: }
429: #endif
430:
431: if (n == 0) {
432: if (m->m_flags & (M_BCAST | M_MCAST)) {
433: udpstat.udps_noportbcast++;
434: goto bad;
435: }
1.61 itojun 436: udpstat.udps_noport++;
1.64 ws 437: #ifdef IPKDB
1.53 itojun 438: if (checkipkdb(&ip->ip_src, uh->uh_sport, uh->uh_dport,
439: m, iphlen + sizeof(struct udphdr),
440: m->m_pkthdr.len - iphlen - sizeof(struct udphdr))) {
441: /*
442: * It was a debugger connect packet,
443: * just drop it now
444: */
445: goto bad;
446: }
447: #endif
448: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
449: m = NULL;
450: }
451:
452: bad:
453: if (m)
454: m_freem(m);
1.78 thorpej 455: return;
456:
457: badcsum:
458: m_freem(m);
1.53 itojun 459: }
1.72 itojun 460: #endif
1.53 itojun 461:
462: #ifdef INET6
1.129 yamt 463: static int
464: udp6_input_checksum(struct mbuf *m, const struct udphdr *uh, int off, int len)
465: {
466:
1.140 yamt 467: /*
468: * XXX it's better to record and check if this mbuf is
469: * already checked.
470: */
471:
1.129 yamt 472: if (__predict_false((m->m_flags & M_LOOP) && !udp_do_loopback_cksum)) {
473: goto good;
474: }
475: if (uh->uh_sum == 0) {
476: udp6stat.udp6s_nosum++;
477: goto bad;
478: }
1.140 yamt 479:
480: switch (m->m_pkthdr.csum_flags &
481: ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv6) |
482: M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) {
483: case M_CSUM_UDPv6|M_CSUM_TCP_UDP_BAD:
484: UDP_CSUM_COUNTER_INCR(&udp6_hwcsum_bad);
1.129 yamt 485: udp6stat.udp6s_badsum++;
486: goto bad;
1.140 yamt 487:
488: #if 0 /* notyet */
489: case M_CSUM_UDPv6|M_CSUM_DATA:
490: #endif
491:
492: case M_CSUM_UDPv6:
493: /* Checksum was okay. */
494: UDP_CSUM_COUNTER_INCR(&udp6_hwcsum_ok);
495: break;
496:
497: default:
498: /*
499: * Need to compute it ourselves. Maybe skip checksum
500: * on loopback interfaces.
501: */
502: UDP_CSUM_COUNTER_INCR(&udp6_swcsum);
503: if (in6_cksum(m, IPPROTO_UDP, off, len) != 0) {
504: udp6stat.udp6s_badsum++;
505: goto bad;
506: }
1.129 yamt 507: }
508:
509: good:
510: return 0;
511: bad:
512: return -1;
513: }
514:
1.53 itojun 515: int
1.119 matt 516: udp6_input(struct mbuf **mp, int *offp, int proto)
1.53 itojun 517: {
518: struct mbuf *m = *mp;
519: int off = *offp;
520: struct sockaddr_in6 src, dst;
521: struct ip6_hdr *ip6;
522: struct udphdr *uh;
523: u_int32_t plen, ulen;
524:
1.76 itojun 525: ip6 = mtod(m, struct ip6_hdr *);
526:
1.53 itojun 527: #if defined(NFAITH) && 0 < NFAITH
1.76 itojun 528: if (faithprefix(&ip6->ip6_dst)) {
529: /* send icmp6 host unreach? */
530: m_freem(m);
531: return IPPROTO_DONE;
1.53 itojun 532: }
533: #endif
534:
535: udp6stat.udp6s_ipackets++;
536:
537: /* check for jumbogram is done in ip6_input. we can trust pkthdr.len */
538: plen = m->m_pkthdr.len - off;
539: IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(struct udphdr));
540: if (uh == NULL) {
541: ip6stat.ip6s_tooshort++;
542: return IPPROTO_DONE;
543: }
1.95 thorpej 544: KASSERT(UDP_HDR_ALIGNED_P(uh));
1.53 itojun 545: ulen = ntohs((u_short)uh->uh_ulen);
1.69 itojun 546: /*
547: * RFC2675 section 4: jumbograms will have 0 in the UDP header field,
548: * iff payload length > 0xffff.
549: */
1.53 itojun 550: if (ulen == 0 && plen > 0xffff)
551: ulen = plen;
552:
553: if (plen != ulen) {
554: udp6stat.udp6s_badlen++;
1.54 itojun 555: goto bad;
556: }
557:
1.57 itojun 558: /* destination port of 0 is illegal, based on RFC768. */
559: if (uh->uh_dport == 0)
560: goto bad;
561:
1.54 itojun 562: /* Be proactive about malicious use of IPv4 mapped address */
563: if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
564: IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
565: /* XXX stat */
1.53 itojun 566: goto bad;
567: }
568:
569: /*
1.125 thorpej 570: * Checksum extended UDP header and data. Maybe skip checksum
571: * on loopback interfaces.
1.53 itojun 572: */
1.129 yamt 573: if (udp6_input_checksum(m, uh, off, ulen))
574: goto bad;
1.53 itojun 575:
576: /*
577: * Construct source and dst sockaddrs.
578: * Note that ifindex (s6_addr16[1]) is already filled.
579: */
580: bzero(&src, sizeof(src));
581: src.sin6_family = AF_INET6;
582: src.sin6_len = sizeof(struct sockaddr_in6);
1.69 itojun 583: /* KAME hack: recover scopeid */
584: (void)in6_recoverscope(&src, &ip6->ip6_src, m->m_pkthdr.rcvif);
1.53 itojun 585: src.sin6_port = uh->uh_sport;
586: bzero(&dst, sizeof(dst));
587: dst.sin6_family = AF_INET6;
588: dst.sin6_len = sizeof(struct sockaddr_in6);
1.69 itojun 589: /* KAME hack: recover scopeid */
590: (void)in6_recoverscope(&dst, &ip6->ip6_dst, m->m_pkthdr.rcvif);
1.53 itojun 591: dst.sin6_port = uh->uh_dport;
592:
593: if (udp6_realinput(AF_INET6, &src, &dst, m, off) == 0) {
594: if (m->m_flags & M_MCAST) {
595: udp6stat.udp6s_noportmcast++;
596: goto bad;
597: }
1.61 itojun 598: udp6stat.udp6s_noport++;
1.53 itojun 599: icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
600: m = NULL;
601: }
602:
603: bad:
604: if (m)
605: m_freem(m);
606: return IPPROTO_DONE;
607: }
608: #endif
609:
1.72 itojun 610: #ifdef INET
1.53 itojun 611: static void
1.119 matt 612: udp4_sendup(struct mbuf *m, int off /* offset of data portion */,
613: struct sockaddr *src, struct socket *so)
1.53 itojun 614: {
615: struct mbuf *opts = NULL;
616: struct mbuf *n;
617: struct inpcb *inp = NULL;
618:
619: if (!so)
620: return;
621: switch (so->so_proto->pr_domain->dom_family) {
622: case AF_INET:
623: inp = sotoinpcb(so);
624: break;
625: #ifdef INET6
626: case AF_INET6:
627: break;
628: #endif
629: default:
630: return;
631: }
632:
1.105 jonathan 633: #if defined(IPSEC) || defined(FAST_IPSEC)
1.53 itojun 634: /* check AH/ESP integrity. */
635: if (so != NULL && ipsec4_in_reject_so(m, so)) {
636: ipsecstat.in_polvio++;
1.110 itojun 637: if ((n = m_copy(m, 0, M_COPYALL)) != NULL)
638: icmp_error(n, ICMP_UNREACH, ICMP_UNREACH_ADMIN_PROHIBIT,
639: 0, 0);
1.53 itojun 640: return;
641: }
642: #endif /*IPSEC*/
643:
644: if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
645: if (inp && (inp->inp_flags & INP_CONTROLOPTS
646: || so->so_options & SO_TIMESTAMP)) {
647: struct ip *ip = mtod(n, struct ip *);
648: ip_savecontrol(inp, &opts, ip, n);
649: }
650:
651: m_adj(n, off);
652: if (sbappendaddr(&so->so_rcv, src, n,
653: opts) == 0) {
654: m_freem(n);
655: if (opts)
656: m_freem(opts);
1.124 darrenr 657: so->so_rcv.sb_overflowed++;
1.81 enami 658: udpstat.udps_fullsock++;
1.53 itojun 659: } else
660: sorwakeup(so);
661: }
662: }
1.72 itojun 663: #endif
1.53 itojun 664:
665: #ifdef INET6
666: static void
1.119 matt 667: udp6_sendup(struct mbuf *m, int off /* offset of data portion */,
668: struct sockaddr *src, struct socket *so)
1.53 itojun 669: {
670: struct mbuf *opts = NULL;
671: struct mbuf *n;
672: struct in6pcb *in6p = NULL;
673:
674: if (!so)
675: return;
676: if (so->so_proto->pr_domain->dom_family != AF_INET6)
677: return;
678: in6p = sotoin6pcb(so);
679:
1.105 jonathan 680: #if defined(IPSEC) || defined(FAST_IPSEC)
1.53 itojun 681: /* check AH/ESP integrity. */
682: if (so != NULL && ipsec6_in_reject_so(m, so)) {
683: ipsec6stat.in_polvio++;
1.111 mycroft 684: if ((n = m_copy(m, 0, M_COPYALL)) != NULL)
1.110 itojun 685: icmp6_error(n, ICMP6_DST_UNREACH,
686: ICMP6_DST_UNREACH_ADMIN, 0);
1.53 itojun 687: return;
688: }
689: #endif /*IPSEC*/
690:
691: if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
692: if (in6p && (in6p->in6p_flags & IN6P_CONTROLOPTS
693: || in6p->in6p_socket->so_options & SO_TIMESTAMP)) {
694: struct ip6_hdr *ip6 = mtod(n, struct ip6_hdr *);
695: ip6_savecontrol(in6p, &opts, ip6, n);
696: }
697:
698: m_adj(n, off);
699: if (sbappendaddr(&so->so_rcv, src, n, opts) == 0) {
700: m_freem(n);
701: if (opts)
702: m_freem(opts);
1.124 darrenr 703: so->so_rcv.sb_overflowed++;
1.53 itojun 704: udp6stat.udp6s_fullsock++;
705: } else
706: sorwakeup(so);
707: }
708: }
709: #endif
710:
1.72 itojun 711: #ifdef INET
1.53 itojun 712: static int
1.119 matt 713: udp4_realinput(struct sockaddr_in *src, struct sockaddr_in *dst,
1.144 manu 714: struct mbuf **mp, int off /* offset of udphdr */)
1.53 itojun 715: {
716: u_int16_t *sport, *dport;
717: int rcvcnt;
718: struct in_addr *src4, *dst4;
1.109 itojun 719: struct inpcb_hdr *inph;
1.53 itojun 720: struct inpcb *inp;
1.144 manu 721: struct mbuf *m = *mp;
1.53 itojun 722:
723: rcvcnt = 0;
724: off += sizeof(struct udphdr); /* now, offset of payload */
725:
726: if (src->sin_family != AF_INET || dst->sin_family != AF_INET)
727: goto bad;
728:
729: src4 = &src->sin_addr;
730: sport = &src->sin_port;
731: dst4 = &dst->sin_addr;
732: dport = &dst->sin_port;
733:
1.73 itojun 734: if (IN_MULTICAST(dst4->s_addr) ||
1.53 itojun 735: in_broadcast(*dst4, m->m_pkthdr.rcvif)) {
736: /*
737: * Deliver a multicast or broadcast datagram to *all* sockets
738: * for which the local and remote addresses and ports match
739: * those of the incoming datagram. This allows more than
740: * one process to receive multi/broadcasts on the same port.
741: * (This really ought to be done for unicast datagrams as
742: * well, but that would cause problems with existing
743: * applications that open both address-specific sockets and
744: * a wildcard socket listening to the same port -- they would
745: * end up receiving duplicates of every unicast datagram.
746: * Those applications open the multiple sockets to overcome an
747: * inadequacy of the UDP socket interface, but for backwards
748: * compatibility we avoid the problem here rather than
749: * fixing the interface. Maybe 4.5BSD will remedy this?)
750: */
751:
752: /*
1.92 itojun 753: * KAME note: traditionally we dropped udpiphdr from mbuf here.
1.71 itojun 754: * we need udpiphdr for IPsec processing so we do that later.
1.53 itojun 755: */
756: /*
757: * Locate pcb(s) for datagram.
758: */
1.109 itojun 759: CIRCLEQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) {
760: inp = (struct inpcb *)inph;
761: if (inp->inp_af != AF_INET)
762: continue;
763:
1.53 itojun 764: if (inp->inp_lport != *dport)
765: continue;
766: if (!in_nullhost(inp->inp_laddr)) {
767: if (!in_hosteq(inp->inp_laddr, *dst4))
768: continue;
769: }
770: if (!in_nullhost(inp->inp_faddr)) {
771: if (!in_hosteq(inp->inp_faddr, *src4) ||
772: inp->inp_fport != *sport)
773: continue;
774: }
775:
776: udp4_sendup(m, off, (struct sockaddr *)src,
777: inp->inp_socket);
778: rcvcnt++;
779:
780: /*
781: * Don't look for additional matches if this one does
782: * not have either the SO_REUSEPORT or SO_REUSEADDR
783: * socket options set. This heuristic avoids searching
784: * through all pcbs in the common case of a non-shared
785: * port. It assumes that an application will never
786: * clear these options after setting them.
787: */
788: if ((inp->inp_socket->so_options &
789: (SO_REUSEPORT|SO_REUSEADDR)) == 0)
790: break;
791: }
792: } else {
793: /*
794: * Locate pcb for datagram.
795: */
796: inp = in_pcblookup_connect(&udbtable, *src4, *sport, *dst4, *dport);
797: if (inp == 0) {
798: ++udpstat.udps_pcbhashmiss;
799: inp = in_pcblookup_bind(&udbtable, *dst4, *dport);
1.82 itojun 800: if (inp == 0)
1.53 itojun 801: return rcvcnt;
802: }
803:
1.130 manu 804: #ifdef IPSEC_NAT_T
805: /* Handle ESP over UDP */
806: if (inp->inp_flags & INP_ESPINUDP_ALL) {
807: struct sockaddr *sa = (struct sockaddr *)src;
808:
1.144 manu 809: switch(udp4_espinudp(mp, off, sa, inp->inp_socket)) {
810: case -1: /* Error, m was freeed */
811: rcvcnt = -1;
812: goto bad;
813: break;
814:
815: case 1: /* ESP over UDP */
1.130 manu 816: rcvcnt++;
817: goto bad;
1.144 manu 818: break;
819:
820: case 0: /* plain UDP */
821: default: /* Unexpected */
822: /*
823: * Normal UDP processing will take place
824: * m may have changed.
825: */
826: m = *mp;
827: break;
1.130 manu 828: }
829: }
830: #endif
831:
1.53 itojun 832: udp4_sendup(m, off, (struct sockaddr *)src, inp->inp_socket);
833: rcvcnt++;
834: }
835:
836: bad:
837: return rcvcnt;
838: }
1.72 itojun 839: #endif
1.53 itojun 840:
841: #ifdef INET6
842: static int
1.119 matt 843: udp6_realinput(int af, struct sockaddr_in6 *src, struct sockaddr_in6 *dst,
844: struct mbuf *m, int off)
1.53 itojun 845: {
1.79 itojun 846: u_int16_t sport, dport;
1.53 itojun 847: int rcvcnt;
1.79 itojun 848: struct in6_addr src6, dst6;
849: const struct in_addr *dst4;
1.109 itojun 850: struct inpcb_hdr *inph;
1.53 itojun 851: struct in6pcb *in6p;
852:
853: rcvcnt = 0;
854: off += sizeof(struct udphdr); /* now, offset of payload */
855:
856: if (af != AF_INET && af != AF_INET6)
857: goto bad;
858: if (src->sin6_family != AF_INET6 || dst->sin6_family != AF_INET6)
859: goto bad;
860:
1.79 itojun 861: in6_embedscope(&src6, src, NULL, NULL);
862: sport = src->sin6_port;
863: in6_embedscope(&dst6, dst, NULL, NULL);
864: dport = dst->sin6_port;
1.88 itojun 865: dst4 = (struct in_addr *)&dst->sin6_addr.s6_addr[12];
1.53 itojun 866:
1.79 itojun 867: if (IN6_IS_ADDR_MULTICAST(&dst6) ||
868: (af == AF_INET && IN_MULTICAST(dst4->s_addr))) {
1.53 itojun 869: /*
870: * Deliver a multicast or broadcast datagram to *all* sockets
871: * for which the local and remote addresses and ports match
872: * those of the incoming datagram. This allows more than
873: * one process to receive multi/broadcasts on the same port.
874: * (This really ought to be done for unicast datagrams as
875: * well, but that would cause problems with existing
876: * applications that open both address-specific sockets and
877: * a wildcard socket listening to the same port -- they would
878: * end up receiving duplicates of every unicast datagram.
879: * Those applications open the multiple sockets to overcome an
880: * inadequacy of the UDP socket interface, but for backwards
881: * compatibility we avoid the problem here rather than
882: * fixing the interface. Maybe 4.5BSD will remedy this?)
883: */
884:
885: /*
1.92 itojun 886: * KAME note: traditionally we dropped udpiphdr from mbuf here.
1.71 itojun 887: * we need udpiphdr for IPsec processing so we do that later.
1.53 itojun 888: */
889: /*
890: * Locate pcb(s) for datagram.
891: */
1.109 itojun 892: CIRCLEQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) {
893: in6p = (struct in6pcb *)inph;
894: if (in6p->in6p_af != AF_INET6)
895: continue;
896:
1.79 itojun 897: if (in6p->in6p_lport != dport)
1.53 itojun 898: continue;
899: if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
1.90 itojun 900: if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &dst6))
1.53 itojun 901: continue;
1.92 itojun 902: } else {
1.79 itojun 903: if (IN6_IS_ADDR_V4MAPPED(&dst6) &&
1.85 itojun 904: (in6p->in6p_flags & IN6P_IPV6_V6ONLY))
1.55 itojun 905: continue;
906: }
1.53 itojun 907: if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
1.79 itojun 908: if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr,
909: &src6) || in6p->in6p_fport != sport)
1.53 itojun 910: continue;
1.92 itojun 911: } else {
1.79 itojun 912: if (IN6_IS_ADDR_V4MAPPED(&src6) &&
1.85 itojun 913: (in6p->in6p_flags & IN6P_IPV6_V6ONLY))
1.55 itojun 914: continue;
915: }
1.53 itojun 916:
917: udp6_sendup(m, off, (struct sockaddr *)src,
918: in6p->in6p_socket);
919: rcvcnt++;
920:
921: /*
922: * Don't look for additional matches if this one does
923: * not have either the SO_REUSEPORT or SO_REUSEADDR
924: * socket options set. This heuristic avoids searching
925: * through all pcbs in the common case of a non-shared
926: * port. It assumes that an application will never
927: * clear these options after setting them.
928: */
929: if ((in6p->in6p_socket->so_options &
930: (SO_REUSEPORT|SO_REUSEADDR)) == 0)
931: break;
932: }
933: } else {
934: /*
935: * Locate pcb for datagram.
936: */
1.109 itojun 937: in6p = in6_pcblookup_connect(&udbtable, &src6, sport,
1.79 itojun 938: &dst6, dport, 0);
1.53 itojun 939: if (in6p == 0) {
940: ++udpstat.udps_pcbhashmiss;
1.109 itojun 941: in6p = in6_pcblookup_bind(&udbtable, &dst6, dport, 0);
1.82 itojun 942: if (in6p == 0)
1.53 itojun 943: return rcvcnt;
944: }
945:
946: udp6_sendup(m, off, (struct sockaddr *)src, in6p->in6p_socket);
947: rcvcnt++;
948: }
949:
950: bad:
951: return rcvcnt;
952: }
953: #endif
1.1 cgd 954:
1.72 itojun 955: #ifdef INET
1.1 cgd 956: /*
957: * Notify a udp user of an asynchronous error;
958: * just wake up so that he can collect error status.
959: */
1.7 mycroft 960: static void
1.119 matt 961: udp_notify(struct inpcb *inp, int errno)
1.1 cgd 962: {
963: inp->inp_socket->so_error = errno;
964: sorwakeup(inp->inp_socket);
965: sowwakeup(inp->inp_socket);
966: }
967:
1.27 christos 968: void *
1.119 matt 969: udp_ctlinput(int cmd, struct sockaddr *sa, void *v)
1.1 cgd 970: {
1.66 augustss 971: struct ip *ip = v;
972: struct udphdr *uh;
1.119 matt 973: void (*notify)(struct inpcb *, int) = udp_notify;
1.21 mycroft 974: int errno;
1.1 cgd 975:
1.53 itojun 976: if (sa->sa_family != AF_INET
977: || sa->sa_len != sizeof(struct sockaddr_in))
1.51 itojun 978: return NULL;
1.20 mycroft 979: if ((unsigned)cmd >= PRC_NCMDS)
1.27 christos 980: return NULL;
1.20 mycroft 981: errno = inetctlerrmap[cmd];
1.18 mycroft 982: if (PRC_IS_REDIRECT(cmd))
1.19 mycroft 983: notify = in_rtchange, ip = 0;
1.18 mycroft 984: else if (cmd == PRC_HOSTDEAD)
1.19 mycroft 985: ip = 0;
1.23 cgd 986: else if (errno == 0)
1.27 christos 987: return NULL;
1.19 mycroft 988: if (ip) {
1.1 cgd 989: uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
1.34 mycroft 990: in_pcbnotify(&udbtable, satosin(sa)->sin_addr, uh->uh_dport,
991: ip->ip_src, uh->uh_sport, errno, notify);
1.53 itojun 992:
993: /* XXX mapped address case */
1.19 mycroft 994: } else
1.34 mycroft 995: in_pcbnotifyall(&udbtable, satosin(sa)->sin_addr, errno,
996: notify);
1.27 christos 997: return NULL;
1.1 cgd 998: }
999:
1.7 mycroft 1000: int
1.131 perry 1001: udp_ctloutput(op, so, level, optname, mp)
1.130 manu 1002: int op;
1003: struct socket *so;
1004: int level, optname;
1005: struct mbuf **mp;
1006: {
1007: int s;
1008: int error = 0;
1009: struct mbuf *m;
1010: struct inpcb *inp;
1011: int family;
1012:
1013: family = so->so_proto->pr_domain->dom_family;
1014:
1015: s = splsoftnet();
1016: switch (family) {
1017: #ifdef INET
1018: case PF_INET:
1019: if (level != IPPROTO_UDP) {
1020: error = ip_ctloutput(op, so, level, optname, mp);
1021: goto end;
1022: }
1023: break;
1024: #endif
1025: #ifdef INET6
1026: case PF_INET6:
1027: if (level != IPPROTO_UDP) {
1028: error = ip6_ctloutput(op, so, level, optname, mp);
1029: goto end;
1030: }
1031: break;
1032: #endif
1033: default:
1034: error = EAFNOSUPPORT;
1035: goto end;
1036: break;
1037: }
1038:
1039:
1040: switch (op) {
1041: case PRCO_SETOPT:
1042: m = *mp;
1043: inp = sotoinpcb(so);
1044:
1045: switch (optname) {
1046: case UDP_ENCAP:
1047: if (m == NULL || m->m_len < sizeof (int)) {
1048: error = EINVAL;
1049: goto end;
1050: }
1.131 perry 1051:
1.130 manu 1052: switch(*mtod(m, int *)) {
1053: #ifdef IPSEC_NAT_T
1054: case 0:
1055: inp->inp_flags &= ~INP_ESPINUDP_ALL;
1056: break;
1057:
1058: case UDP_ENCAP_ESPINUDP:
1059: inp->inp_flags &= ~INP_ESPINUDP_ALL;
1060: inp->inp_flags |= INP_ESPINUDP;
1061: break;
1.131 perry 1062:
1.130 manu 1063: case UDP_ENCAP_ESPINUDP_NON_IKE:
1064: inp->inp_flags &= ~INP_ESPINUDP_ALL;
1065: inp->inp_flags |= INP_ESPINUDP_NON_IKE;
1066: break;
1067: #endif
1068: default:
1069: error = EINVAL;
1070: goto end;
1071: break;
1072: }
1073: break;
1074:
1075: default:
1076: error = ENOPROTOOPT;
1077: goto end;
1078: break;
1079: }
1080: break;
1081:
1082: default:
1083: error = EINVAL;
1084: goto end;
1085: break;
1.131 perry 1086: }
1087:
1.130 manu 1088: end:
1089: splx(s);
1090: return error;
1091: }
1.131 perry 1092:
1.130 manu 1093:
1094: int
1.27 christos 1095: udp_output(struct mbuf *m, ...)
1096: {
1.66 augustss 1097: struct inpcb *inp;
1098: struct udpiphdr *ui;
1.125 thorpej 1099: struct route *ro;
1.66 augustss 1100: int len = m->m_pkthdr.len;
1.31 mycroft 1101: int error = 0;
1.27 christos 1102: va_list ap;
1103:
1.98 matt 1104: MCLAIM(m, &udp_tx_mowner);
1.27 christos 1105: va_start(ap, m);
1106: inp = va_arg(ap, struct inpcb *);
1107: va_end(ap);
1.1 cgd 1108:
1109: /*
1110: * Calculate data length and get a mbuf
1111: * for UDP and IP headers.
1112: */
1.13 mycroft 1113: M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT);
1114: if (m == 0) {
1115: error = ENOBUFS;
1.39 thorpej 1116: goto release;
1117: }
1118:
1119: /*
1120: * Compute the packet length of the IP header, and
1121: * punt if the length looks bogus.
1122: */
1.96 itojun 1123: if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) {
1.39 thorpej 1124: error = EMSGSIZE;
1.13 mycroft 1125: goto release;
1126: }
1.1 cgd 1127:
1128: /*
1129: * Fill in mbuf with extended UDP header
1130: * and addresses and length put into network format.
1131: */
1132: ui = mtod(m, struct udpiphdr *);
1133: ui->ui_pr = IPPROTO_UDP;
1134: ui->ui_src = inp->inp_laddr;
1135: ui->ui_dst = inp->inp_faddr;
1136: ui->ui_sport = inp->inp_lport;
1137: ui->ui_dport = inp->inp_fport;
1.78 thorpej 1138: ui->ui_ulen = htons((u_int16_t)len + sizeof(struct udphdr));
1.1 cgd 1139:
1.125 thorpej 1140: ro = &inp->inp_route;
1141:
1.1 cgd 1142: /*
1.78 thorpej 1143: * Set up checksum and output datagram.
1.1 cgd 1144: */
1145: if (udpcksum) {
1.78 thorpej 1146: /*
1147: * XXX Cache pseudo-header checksum part for
1148: * XXX "connected" UDP sockets.
1149: */
1150: ui->ui_sum = in_cksum_phdr(ui->ui_src.s_addr,
1151: ui->ui_dst.s_addr, htons((u_int16_t)len +
1152: sizeof(struct udphdr) + IPPROTO_UDP));
1.135 yamt 1153: m->m_pkthdr.csum_flags = M_CSUM_UDPv4;
1.78 thorpej 1154: m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
1155: } else
1156: ui->ui_sum = 0;
1.96 itojun 1157: ((struct ip *)ui)->ip_len = htons(sizeof (struct udpiphdr) + len);
1.1 cgd 1158: ((struct ip *)ui)->ip_ttl = inp->inp_ip.ip_ttl; /* XXX */
1159: ((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; /* XXX */
1160: udpstat.udps_opackets++;
1.48 itojun 1161:
1.125 thorpej 1162: return (ip_output(m, inp->inp_options, ro,
1.12 mycroft 1163: inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST),
1.107 itojun 1164: inp->inp_moptions, inp->inp_socket));
1.1 cgd 1165:
1166: release:
1167: m_freem(m);
1168: return (error);
1169: }
1170:
1.42 thorpej 1171: int udp_sendspace = 9216; /* really max datagram size */
1172: int udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in));
1.1 cgd 1173: /* 40 1K datagrams */
1174:
1175: /*ARGSUSED*/
1.7 mycroft 1176: int
1.119 matt 1177: udp_usrreq(struct socket *so, int req, struct mbuf *m, struct mbuf *nam,
1.145 ! christos 1178: struct mbuf *control, struct lwp *l)
1.1 cgd 1179: {
1.66 augustss 1180: struct inpcb *inp;
1.145 ! christos 1181: struct proc *p;
1.1 cgd 1182: int s;
1.66 augustss 1183: int error = 0;
1.1 cgd 1184:
1.145 ! christos 1185: p = l ? l->l_proc : NULL;
1.1 cgd 1186: if (req == PRU_CONTROL)
1.31 mycroft 1187: return (in_control(so, (long)m, (caddr_t)nam,
1.30 mycroft 1188: (struct ifnet *)control, p));
1.59 thorpej 1189:
1.60 thorpej 1190: if (req == PRU_PURGEIF) {
1.80 itojun 1191: in_pcbpurgeif0(&udbtable, (struct ifnet *)control);
1.60 thorpej 1192: in_purgeif((struct ifnet *)control);
1193: in_pcbpurgeif(&udbtable, (struct ifnet *)control);
1.59 thorpej 1194: return (0);
1195: }
1.31 mycroft 1196:
1197: s = splsoftnet();
1198: inp = sotoinpcb(so);
1.32 mycroft 1199: #ifdef DIAGNOSTIC
1200: if (req != PRU_SEND && req != PRU_SENDOOB && control)
1201: panic("udp_usrreq: unexpected control mbuf");
1202: #endif
1.31 mycroft 1203: if (inp == 0 && req != PRU_ATTACH) {
1204: error = EINVAL;
1205: goto release;
1206: }
1207:
1.1 cgd 1208: /*
1209: * Note: need to block udp_input while changing
1210: * the udp pcb queue and/or pcb addresses.
1211: */
1212: switch (req) {
1213:
1214: case PRU_ATTACH:
1.31 mycroft 1215: if (inp != 0) {
1216: error = EISCONN;
1.1 cgd 1217: break;
1218: }
1.98 matt 1219: #ifdef MBUFTRACE
1220: so->so_mowner = &udp_mowner;
1221: so->so_rcv.sb_mowner = &udp_rx_mowner;
1222: so->so_snd.sb_mowner = &udp_tx_mowner;
1223: #endif
1.31 mycroft 1224: if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
1225: error = soreserve(so, udp_sendspace, udp_recvspace);
1226: if (error)
1227: break;
1228: }
1.18 mycroft 1229: error = in_pcballoc(so, &udbtable);
1.1 cgd 1230: if (error)
1231: break;
1.31 mycroft 1232: inp = sotoinpcb(so);
1233: inp->inp_ip.ip_ttl = ip_defttl;
1.1 cgd 1234: break;
1235:
1236: case PRU_DETACH:
1.31 mycroft 1237: in_pcbdetach(inp);
1.1 cgd 1238: break;
1239:
1240: case PRU_BIND:
1.31 mycroft 1241: error = in_pcbbind(inp, nam, p);
1.1 cgd 1242: break;
1243:
1244: case PRU_LISTEN:
1245: error = EOPNOTSUPP;
1246: break;
1247:
1248: case PRU_CONNECT:
1.143 dsl 1249: error = in_pcbconnect(inp, nam, p);
1.31 mycroft 1250: if (error)
1.1 cgd 1251: break;
1.31 mycroft 1252: soisconnected(so);
1.1 cgd 1253: break;
1254:
1255: case PRU_CONNECT2:
1256: error = EOPNOTSUPP;
1257: break;
1258:
1259: case PRU_DISCONNECT:
1.31 mycroft 1260: /*soisdisconnected(so);*/
1261: so->so_state &= ~SS_ISCONNECTED; /* XXX */
1.1 cgd 1262: in_pcbdisconnect(inp);
1.34 mycroft 1263: inp->inp_laddr = zeroin_addr; /* XXX */
1.35 mycroft 1264: in_pcbstate(inp, INP_BOUND); /* XXX */
1.1 cgd 1265: break;
1266:
1267: case PRU_SHUTDOWN:
1268: socantsendmore(so);
1269: break;
1270:
1.31 mycroft 1271: case PRU_RCVD:
1272: error = EOPNOTSUPP;
1.1 cgd 1273: break;
1274:
1.31 mycroft 1275: case PRU_SEND:
1.32 mycroft 1276: if (control && control->m_len) {
1277: m_freem(control);
1278: m_freem(m);
1279: error = EINVAL;
1280: break;
1281: }
1.31 mycroft 1282: {
1.35 mycroft 1283: struct in_addr laddr; /* XXX */
1.1 cgd 1284:
1.31 mycroft 1285: if (nam) {
1.35 mycroft 1286: laddr = inp->inp_laddr; /* XXX */
1.31 mycroft 1287: if ((so->so_state & SS_ISCONNECTED) != 0) {
1288: error = EISCONN;
1.32 mycroft 1289: goto die;
1.31 mycroft 1290: }
1.143 dsl 1291: error = in_pcbconnect(inp, nam, p);
1.100 matt 1292: if (error)
1293: goto die;
1.31 mycroft 1294: } else {
1295: if ((so->so_state & SS_ISCONNECTED) == 0) {
1296: error = ENOTCONN;
1.32 mycroft 1297: goto die;
1.31 mycroft 1298: }
1299: }
1.33 mycroft 1300: error = udp_output(m, inp);
1.100 matt 1301: m = NULL;
1.31 mycroft 1302: if (nam) {
1303: in_pcbdisconnect(inp);
1.35 mycroft 1304: inp->inp_laddr = laddr; /* XXX */
1305: in_pcbstate(inp, INP_BOUND); /* XXX */
1.31 mycroft 1306: }
1.100 matt 1307: die:
1308: if (m)
1309: m_freem(m);
1.31 mycroft 1310: }
1.1 cgd 1311: break;
1312:
1313: case PRU_SENSE:
1314: /*
1315: * stat: don't bother with a blocksize.
1316: */
1.31 mycroft 1317: splx(s);
1.1 cgd 1318: return (0);
1319:
1.31 mycroft 1320: case PRU_RCVOOB:
1321: error = EOPNOTSUPP;
1322: break;
1323:
1.1 cgd 1324: case PRU_SENDOOB:
1.32 mycroft 1325: m_freem(control);
1.31 mycroft 1326: m_freem(m);
1.1 cgd 1327: error = EOPNOTSUPP;
1328: break;
1329:
1.31 mycroft 1330: case PRU_SOCKADDR:
1331: in_setsockaddr(inp, nam);
1332: break;
1333:
1334: case PRU_PEERADDR:
1335: in_setpeeraddr(inp, nam);
1336: break;
1.1 cgd 1337:
1338: default:
1339: panic("udp_usrreq");
1340: }
1341:
1342: release:
1.31 mycroft 1343: splx(s);
1.1 cgd 1344: return (error);
1.13 mycroft 1345: }
1346:
1347: /*
1348: * Sysctl for udp variables.
1349: */
1.114 atatat 1350: SYSCTL_SETUP(sysctl_net_inet_udp_setup, "sysctl net.inet.udp subtree setup")
1.13 mycroft 1351: {
1.114 atatat 1352:
1.116 atatat 1353: sysctl_createv(clog, 0, NULL, NULL,
1354: CTLFLAG_PERMANENT,
1.114 atatat 1355: CTLTYPE_NODE, "net", NULL,
1356: NULL, 0, NULL, 0,
1357: CTL_NET, CTL_EOL);
1.116 atatat 1358: sysctl_createv(clog, 0, NULL, NULL,
1359: CTLFLAG_PERMANENT,
1.114 atatat 1360: CTLTYPE_NODE, "inet", NULL,
1361: NULL, 0, NULL, 0,
1362: CTL_NET, PF_INET, CTL_EOL);
1.116 atatat 1363: sysctl_createv(clog, 0, NULL, NULL,
1364: CTLFLAG_PERMANENT,
1.122 atatat 1365: CTLTYPE_NODE, "udp",
1366: SYSCTL_DESCR("UDPv4 related settings"),
1.114 atatat 1367: NULL, 0, NULL, 0,
1368: CTL_NET, PF_INET, IPPROTO_UDP, CTL_EOL);
1369:
1.116 atatat 1370: sysctl_createv(clog, 0, NULL, NULL,
1371: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122 atatat 1372: CTLTYPE_INT, "checksum",
1.123 heas 1373: SYSCTL_DESCR("Compute UDP checksums"),
1.114 atatat 1374: NULL, 0, &udpcksum, 0,
1375: CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_CHECKSUM,
1376: CTL_EOL);
1.116 atatat 1377: sysctl_createv(clog, 0, NULL, NULL,
1378: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122 atatat 1379: CTLTYPE_INT, "sendspace",
1380: SYSCTL_DESCR("Default UDP send buffer size"),
1.114 atatat 1381: NULL, 0, &udp_sendspace, 0,
1382: CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_SENDSPACE,
1383: CTL_EOL);
1.116 atatat 1384: sysctl_createv(clog, 0, NULL, NULL,
1385: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122 atatat 1386: CTLTYPE_INT, "recvspace",
1387: SYSCTL_DESCR("Default UDP receive buffer size"),
1.114 atatat 1388: NULL, 0, &udp_recvspace, 0,
1389: CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_RECVSPACE,
1390: CTL_EOL);
1.125 thorpej 1391: sysctl_createv(clog, 0, NULL, NULL,
1392: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1393: CTLTYPE_INT, "do_loopback_cksum",
1394: SYSCTL_DESCR("Perform UDP checksum on loopback"),
1395: NULL, 0, &udp_do_loopback_cksum, 0,
1396: CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_LOOPBACKCKSUM,
1397: CTL_EOL);
1.132 atatat 1398: sysctl_createv(clog, 0, NULL, NULL,
1399: CTLFLAG_PERMANENT,
1.134 atatat 1400: CTLTYPE_STRUCT, "pcblist",
1.132 atatat 1401: SYSCTL_DESCR("UDP protocol control block list"),
1402: sysctl_inpcblist, 0, &udbtable, 0,
1403: CTL_NET, PF_INET, IPPROTO_UDP, CTL_CREATE,
1404: CTL_EOL);
1.139 elad 1405: sysctl_createv(clog, 0, NULL, NULL,
1406: CTLFLAG_PERMANENT,
1407: CTLTYPE_STRUCT, "stats",
1408: SYSCTL_DESCR("UDP statistics"),
1409: NULL, 0, &udpstat, sizeof(udpstat),
1410: CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_STATS,
1411: CTL_EOL);
1.1 cgd 1412: }
1.72 itojun 1413: #endif
1.130 manu 1414:
1415: #if (defined INET && defined IPSEC_NAT_T)
1416: /*
1417: * Returns:
1418: * 1 if the packet was processed
1419: * 0 if normal UDP processing should take place
1.144 manu 1420: * -1 if an error occurent and m was freed
1.130 manu 1421: */
1422: static int
1.144 manu 1423: udp4_espinudp(mp, off, src, so)
1424: struct mbuf **mp;
1.130 manu 1425: int off;
1426: struct sockaddr *src;
1427: struct socket *so;
1428: {
1429: size_t len;
1430: caddr_t data;
1431: struct inpcb *inp;
1432: size_t skip = 0;
1433: size_t minlen;
1434: size_t iphdrlen;
1435: struct ip *ip;
1436: struct mbuf *n;
1.136 manu 1437: struct m_tag *tag;
1438: struct udphdr *udphdr;
1439: u_int16_t sport, dport;
1.144 manu 1440: struct mbuf *m = *mp;
1.130 manu 1441:
1.131 perry 1442: /*
1.130 manu 1443: * Collapse the mbuf chain if the first mbuf is too short
1444: * The longest case is: UDP + non ESP marker + ESP
1445: */
1446: minlen = off + sizeof(u_int64_t) + sizeof(struct esp);
1447: if (minlen > m->m_pkthdr.len)
1448: minlen = m->m_pkthdr.len;
1449:
1450: if (m->m_len < minlen) {
1.144 manu 1451: if ((*mp = m_pullup(m, minlen)) == NULL) {
1.130 manu 1452: printf("udp4_espinudp: m_pullup failed\n");
1.144 manu 1453: return -1;
1.130 manu 1454: }
1.144 manu 1455: m = *mp;
1.130 manu 1456: }
1457:
1.131 perry 1458: len = m->m_len - off;
1.130 manu 1459: data = mtod(m, caddr_t) + off;
1460: inp = sotoinpcb(so);
1461:
1462: /* Ignore keepalive packets */
1463: if ((len == 1) && (data[0] == '\xff')) {
1464: return 1;
1465: }
1466:
1.131 perry 1467: /*
1468: * Check that the payload is long enough to hold
1.130 manu 1469: * an ESP header and compute the length of encapsulation
1.131 perry 1470: * header to remove
1.130 manu 1471: */
1472: if (inp->inp_flags & INP_ESPINUDP) {
1473: u_int32_t *st = (u_int32_t *)data;
1474:
1475: if ((len <= sizeof(struct esp)) || (*st == 0))
1476: return 0; /* Normal UDP processing */
1477:
1478: skip = sizeof(struct udphdr);
1479: }
1480:
1481: if (inp->inp_flags & INP_ESPINUDP_NON_IKE) {
1.142 kleink 1482: u_int32_t *st = (u_int32_t *)data;
1.130 manu 1483:
1484: if ((len <= sizeof(u_int64_t) + sizeof(struct esp))
1.142 kleink 1485: || ((st[0] | st[1]) != 0))
1.130 manu 1486: return 0; /* Normal UDP processing */
1.131 perry 1487:
1.130 manu 1488: skip = sizeof(struct udphdr) + sizeof(u_int64_t);
1489: }
1490:
1491: /*
1.136 manu 1492: * Get the UDP ports. They are handled in network
1493: * order everywhere in IPSEC_NAT_T code.
1494: */
1495: udphdr = (struct udphdr *)(data - skip);
1496: sport = udphdr->uh_sport;
1497: dport = udphdr->uh_dport;
1498:
1499: /*
1.130 manu 1500: * Remove the UDP header (and possibly the non ESP marker)
1501: * IP header lendth is iphdrlen
1.131 perry 1502: * Before:
1.130 manu 1503: * <--- off --->
1504: * +----+------+-----+
1505: * | IP | UDP | ESP |
1506: * +----+------+-----+
1507: * <-skip->
1508: * After:
1509: * +----+-----+
1510: * | IP | ESP |
1511: * +----+-----+
1512: * <-skip->
1513: */
1514: iphdrlen = off - sizeof(struct udphdr);
1515: memmove(mtod(m, caddr_t) + skip, mtod(m, caddr_t), iphdrlen);
1516: m_adj(m, skip);
1517:
1518: ip = mtod(m, struct ip *);
1519: ip->ip_len = htons(ntohs(ip->ip_len) - skip);
1520: ip->ip_p = IPPROTO_ESP;
1521:
1522: /*
1.131 perry 1523: * Copy the mbuf to avoid multiple free, as both
1524: * esp4_input (which we call) and udp_input (which
1.130 manu 1525: * called us) free the mbuf.
1526: */
1527: if ((n = m_dup(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
1528: printf("udp4_espinudp: m_dup failed\n");
1529: return 0;
1530: }
1531:
1.136 manu 1532: /*
1533: * Add a PACKET_TAG_IPSEC_NAT_T_PORT tag to remember
1534: * the source UDP port. This is required if we want
1535: * to select the right SPD for multiple hosts behind
1536: * same NAT
1537: */
1.137 manu 1538: if ((tag = m_tag_get(PACKET_TAG_IPSEC_NAT_T_PORTS,
1539: sizeof(sport) + sizeof(dport), M_DONTWAIT)) == NULL) {
1540: printf("udp4_espinudp: m_tag_get failed\n");
1.138 manu 1541: m_freem(n);
1.137 manu 1542: return 0;
1543: }
1.136 manu 1544: ((u_int16_t *)(tag + 1))[0] = sport;
1545: ((u_int16_t *)(tag + 1))[1] = dport;
1546: m_tag_prepend(n, tag);
1547:
1.130 manu 1548: esp4_input(n, iphdrlen);
1549:
1550: /* We handled it, it shoudln't be handled by UDP */
1551: return 1;
1552: }
1553: #endif
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