Annotation of src/sys/netinet/udp_usrreq.c, Revision 1.145.2.1
1.145.2.1! yamt 1: /* $NetBSD: udp_usrreq.c,v 1.145 2005/12/11 12:24:58 christos 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>
1.145.2.1! yamt 64: __KERNEL_RCSID(0, "$NetBSD: udp_usrreq.c,v 1.145 2005/12/11 12:24:58 christos 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>
1.145.2.1! yamt 109: #include <netinet6/scope6_var.h>
1.53 itojun 110: #endif
111:
112: #ifndef INET6
113: /* always need ip6.h for IP6_EXTHDR_GET */
114: #include <netinet/ip6.h>
115: #endif
116:
1.76 itojun 117: #include "faith.h"
118: #if defined(NFAITH) && NFAITH > 0
119: #include <net/if_faith.h>
120: #endif
121:
1.27 christos 122: #include <machine/stdarg.h>
123:
1.105 jonathan 124: #ifdef FAST_IPSEC
125: #include <netipsec/ipsec.h>
1.121 jonathan 126: #include <netipsec/ipsec_var.h> /* XXX ipsecstat namespace */
1.105 jonathan 127: #ifdef INET6
128: #include <netipsec/ipsec6.h>
129: #endif
130: #endif /* FAST_IPSEC*/
131:
1.48 itojun 132: #ifdef IPSEC
133: #include <netinet6/ipsec.h>
134: #include <netkey/key.h>
135: #endif /*IPSEC*/
136:
1.64 ws 137: #ifdef IPKDB
138: #include <ipkdb/ipkdb.h>
139: #endif
140:
1.8 mycroft 141: /*
142: * UDP protocol implementation.
143: * Per RFC 768, August, 1980.
144: */
145: #ifndef COMPAT_42
146: int udpcksum = 1;
147: #else
148: int udpcksum = 0; /* XXX */
149: #endif
1.141 yamt 150: int udp_do_loopback_cksum = 0;
1.93 matt 151:
152: struct inpcbtable udbtable;
153: struct udpstat udpstat;
1.8 mycroft 154:
1.72 itojun 155: #ifdef INET
1.130 manu 156: #ifdef IPSEC_NAT_T
1.144 manu 157: static int udp4_espinudp (struct mbuf **, int, struct sockaddr *,
1.130 manu 158: struct socket *);
159: #endif
1.119 matt 160: static void udp4_sendup (struct mbuf *, int, struct sockaddr *,
161: struct socket *);
162: static int udp4_realinput (struct sockaddr_in *, struct sockaddr_in *,
1.144 manu 163: struct mbuf **, int);
1.129 yamt 164: static int udp4_input_checksum(struct mbuf *, const struct udphdr *, int, int);
1.72 itojun 165: #endif
1.53 itojun 166: #ifdef INET6
1.119 matt 167: static void udp6_sendup (struct mbuf *, int, struct sockaddr *,
168: struct socket *);
169: static int udp6_realinput (int, struct sockaddr_in6 *,
170: struct sockaddr_in6 *, struct mbuf *, int);
1.129 yamt 171: static int udp6_input_checksum(struct mbuf *, const struct udphdr *, int, int);
1.53 itojun 172: #endif
1.72 itojun 173: #ifdef INET
1.119 matt 174: static void udp_notify (struct inpcb *, int);
1.72 itojun 175: #endif
1.7 mycroft 176:
1.26 mycroft 177: #ifndef UDBHASHSIZE
178: #define UDBHASHSIZE 128
179: #endif
180: int udbhashsize = UDBHASHSIZE;
181:
1.98 matt 182: #ifdef MBUFTRACE
183: struct mowner udp_mowner = { "udp" };
184: struct mowner udp_rx_mowner = { "udp", "rx" };
185: struct mowner udp_tx_mowner = { "udp", "tx" };
186: #endif
187:
1.78 thorpej 188: #ifdef UDP_CSUM_COUNTERS
189: #include <sys/device.h>
190:
1.140 yamt 191: #if defined(INET)
1.78 thorpej 192: struct evcnt udp_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
193: NULL, "udp", "hwcsum bad");
194: struct evcnt udp_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
195: NULL, "udp", "hwcsum ok");
196: struct evcnt udp_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
197: NULL, "udp", "hwcsum data");
198: struct evcnt udp_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
199: NULL, "udp", "swcsum");
200:
1.120 matt 201: EVCNT_ATTACH_STATIC(udp_hwcsum_bad);
202: EVCNT_ATTACH_STATIC(udp_hwcsum_ok);
203: EVCNT_ATTACH_STATIC(udp_hwcsum_data);
204: EVCNT_ATTACH_STATIC(udp_swcsum);
1.140 yamt 205: #endif /* defined(INET) */
206:
207: #if defined(INET6)
208: struct evcnt udp6_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
209: NULL, "udp6", "hwcsum bad");
210: struct evcnt udp6_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
211: NULL, "udp6", "hwcsum ok");
212: struct evcnt udp6_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
213: NULL, "udp6", "hwcsum data");
214: struct evcnt udp6_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
215: NULL, "udp6", "swcsum");
216:
217: EVCNT_ATTACH_STATIC(udp6_hwcsum_bad);
218: EVCNT_ATTACH_STATIC(udp6_hwcsum_ok);
219: EVCNT_ATTACH_STATIC(udp6_hwcsum_data);
220: EVCNT_ATTACH_STATIC(udp6_swcsum);
221: #endif /* defined(INET6) */
222:
223: #define UDP_CSUM_COUNTER_INCR(ev) (ev)->ev_count++
1.120 matt 224:
1.78 thorpej 225: #else
226:
227: #define UDP_CSUM_COUNTER_INCR(ev) /* nothing */
228:
229: #endif /* UDP_CSUM_COUNTERS */
230:
1.7 mycroft 231: void
1.119 matt 232: udp_init(void)
1.1 cgd 233: {
1.18 mycroft 234:
1.35 mycroft 235: in_pcbinit(&udbtable, udbhashsize, udbhashsize);
1.78 thorpej 236:
1.98 matt 237: MOWNER_ATTACH(&udp_tx_mowner);
238: MOWNER_ATTACH(&udp_rx_mowner);
239: MOWNER_ATTACH(&udp_mowner);
1.1 cgd 240: }
241:
1.129 yamt 242: /*
243: * Checksum extended UDP header and data.
244: */
245:
246: int
247: udp_input_checksum(int af, struct mbuf *m, const struct udphdr *uh,
248: int iphlen, int len)
249: {
250:
251: switch (af) {
1.72 itojun 252: #ifdef INET
1.129 yamt 253: case AF_INET:
254: return udp4_input_checksum(m, uh, iphlen, len);
255: #endif
256: #ifdef INET6
257: case AF_INET6:
258: return udp6_input_checksum(m, uh, iphlen, len);
259: #endif
260: }
261: #ifdef DIAGNOSTIC
262: panic("udp_input_checksum: unknown af %d", af);
263: #endif
264: /* NOTREACHED */
265: return -1;
266: }
267:
268: #ifdef INET
269:
270: /*
271: * Checksum extended UDP header and data.
272: */
273:
274: static int
275: udp4_input_checksum(struct mbuf *m, const struct udphdr *uh,
276: int iphlen, int len)
277: {
278:
279: /*
280: * XXX it's better to record and check if this mbuf is
281: * already checked.
282: */
283:
284: if (uh->uh_sum == 0)
285: return 0;
286:
287: switch (m->m_pkthdr.csum_flags &
288: ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv4) |
289: M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) {
290: case M_CSUM_UDPv4|M_CSUM_TCP_UDP_BAD:
291: UDP_CSUM_COUNTER_INCR(&udp_hwcsum_bad);
292: goto badcsum;
293:
294: case M_CSUM_UDPv4|M_CSUM_DATA: {
295: u_int32_t hw_csum = m->m_pkthdr.csum_data;
296:
297: UDP_CSUM_COUNTER_INCR(&udp_hwcsum_data);
298: if (m->m_pkthdr.csum_flags & M_CSUM_NO_PSEUDOHDR) {
299: const struct ip *ip =
300: mtod(m, const struct ip *);
301:
302: hw_csum = in_cksum_phdr(ip->ip_src.s_addr,
303: ip->ip_dst.s_addr,
304: htons(hw_csum + len + IPPROTO_UDP));
305: }
306: if ((hw_csum ^ 0xffff) != 0)
307: goto badcsum;
308: break;
309: }
310:
311: case M_CSUM_UDPv4:
312: /* Checksum was okay. */
313: UDP_CSUM_COUNTER_INCR(&udp_hwcsum_ok);
314: break;
315:
316: default:
317: /*
318: * Need to compute it ourselves. Maybe skip checksum
319: * on loopback interfaces.
320: */
321: if (__predict_true(!(m->m_pkthdr.rcvif->if_flags &
322: IFF_LOOPBACK) ||
323: udp_do_loopback_cksum)) {
324: UDP_CSUM_COUNTER_INCR(&udp_swcsum);
325: if (in4_cksum(m, IPPROTO_UDP, iphlen, len) != 0)
326: goto badcsum;
327: }
328: break;
329: }
330:
331: return 0;
332:
333: badcsum:
334: udpstat.udps_badsum++;
335: return -1;
336: }
337:
1.7 mycroft 338: void
1.27 christos 339: udp_input(struct mbuf *m, ...)
1.1 cgd 340: {
1.53 itojun 341: va_list ap;
342: struct sockaddr_in src, dst;
343: struct ip *ip;
344: struct udphdr *uh;
1.97 simonb 345: int iphlen;
1.53 itojun 346: int len;
347: int n;
1.96 itojun 348: u_int16_t ip_len;
1.53 itojun 349:
350: va_start(ap, m);
351: iphlen = va_arg(ap, int);
1.97 simonb 352: (void)va_arg(ap, int); /* ignore value, advance ap */
1.53 itojun 353: va_end(ap);
354:
1.98 matt 355: MCLAIM(m, &udp_rx_mowner);
1.53 itojun 356: udpstat.udps_ipackets++;
357:
358: /*
359: * Get IP and UDP header together in first mbuf.
360: */
361: ip = mtod(m, struct ip *);
362: IP6_EXTHDR_GET(uh, struct udphdr *, m, iphlen, sizeof(struct udphdr));
363: if (uh == NULL) {
364: udpstat.udps_hdrops++;
365: return;
366: }
1.95 thorpej 367: KASSERT(UDP_HDR_ALIGNED_P(uh));
1.53 itojun 368:
1.57 itojun 369: /* destination port of 0 is illegal, based on RFC768. */
370: if (uh->uh_dport == 0)
371: goto bad;
372:
1.53 itojun 373: /*
374: * Make mbuf data length reflect UDP length.
375: * If not enough data to reflect UDP length, drop.
376: */
1.96 itojun 377: ip_len = ntohs(ip->ip_len);
1.53 itojun 378: len = ntohs((u_int16_t)uh->uh_ulen);
1.96 itojun 379: if (ip_len != iphlen + len) {
380: if (ip_len < iphlen + len || len < sizeof(struct udphdr)) {
1.53 itojun 381: udpstat.udps_badlen++;
382: goto bad;
383: }
1.96 itojun 384: m_adj(m, iphlen + len - ip_len);
1.53 itojun 385: }
386:
387: /*
388: * Checksum extended UDP header and data.
389: */
1.129 yamt 390: if (udp4_input_checksum(m, uh, iphlen, len))
391: goto badcsum;
1.53 itojun 392:
393: /* construct source and dst sockaddrs. */
394: bzero(&src, sizeof(src));
395: src.sin_family = AF_INET;
396: src.sin_len = sizeof(struct sockaddr_in);
397: bcopy(&ip->ip_src, &src.sin_addr, sizeof(src.sin_addr));
398: src.sin_port = uh->uh_sport;
399: bzero(&dst, sizeof(dst));
400: dst.sin_family = AF_INET;
401: dst.sin_len = sizeof(struct sockaddr_in);
402: bcopy(&ip->ip_dst, &dst.sin_addr, sizeof(dst.sin_addr));
403: dst.sin_port = uh->uh_dport;
404:
1.144 manu 405: if ((n = udp4_realinput(&src, &dst, &m, iphlen)) == -1) {
406: udpstat.udps_hdrops++;
407: return;
408: }
1.53 itojun 409: #ifdef INET6
410: if (IN_MULTICAST(ip->ip_dst.s_addr) || n == 0) {
411: struct sockaddr_in6 src6, dst6;
412:
413: bzero(&src6, sizeof(src6));
414: src6.sin6_family = AF_INET6;
415: src6.sin6_len = sizeof(struct sockaddr_in6);
416: src6.sin6_addr.s6_addr[10] = src6.sin6_addr.s6_addr[11] = 0xff;
417: bcopy(&ip->ip_src, &src6.sin6_addr.s6_addr[12],
418: sizeof(ip->ip_src));
419: src6.sin6_port = uh->uh_sport;
420: bzero(&dst6, sizeof(dst6));
421: dst6.sin6_family = AF_INET6;
422: dst6.sin6_len = sizeof(struct sockaddr_in6);
423: dst6.sin6_addr.s6_addr[10] = dst6.sin6_addr.s6_addr[11] = 0xff;
424: bcopy(&ip->ip_dst, &dst6.sin6_addr.s6_addr[12],
425: sizeof(ip->ip_dst));
426: dst6.sin6_port = uh->uh_dport;
427:
428: n += udp6_realinput(AF_INET, &src6, &dst6, m, iphlen);
429: }
430: #endif
431:
432: if (n == 0) {
433: if (m->m_flags & (M_BCAST | M_MCAST)) {
434: udpstat.udps_noportbcast++;
435: goto bad;
436: }
1.61 itojun 437: udpstat.udps_noport++;
1.64 ws 438: #ifdef IPKDB
1.53 itojun 439: if (checkipkdb(&ip->ip_src, uh->uh_sport, uh->uh_dport,
440: m, iphlen + sizeof(struct udphdr),
441: m->m_pkthdr.len - iphlen - sizeof(struct udphdr))) {
442: /*
443: * It was a debugger connect packet,
444: * just drop it now
445: */
446: goto bad;
447: }
448: #endif
449: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
450: m = NULL;
451: }
452:
453: bad:
454: if (m)
455: m_freem(m);
1.78 thorpej 456: return;
457:
458: badcsum:
459: m_freem(m);
1.53 itojun 460: }
1.72 itojun 461: #endif
1.53 itojun 462:
463: #ifdef INET6
1.129 yamt 464: static int
465: udp6_input_checksum(struct mbuf *m, const struct udphdr *uh, int off, int len)
466: {
467:
1.140 yamt 468: /*
469: * XXX it's better to record and check if this mbuf is
470: * already checked.
471: */
472:
1.129 yamt 473: if (__predict_false((m->m_flags & M_LOOP) && !udp_do_loopback_cksum)) {
474: goto good;
475: }
476: if (uh->uh_sum == 0) {
477: udp6stat.udp6s_nosum++;
478: goto bad;
479: }
1.140 yamt 480:
481: switch (m->m_pkthdr.csum_flags &
482: ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv6) |
483: M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) {
484: case M_CSUM_UDPv6|M_CSUM_TCP_UDP_BAD:
485: UDP_CSUM_COUNTER_INCR(&udp6_hwcsum_bad);
1.129 yamt 486: udp6stat.udp6s_badsum++;
487: goto bad;
1.140 yamt 488:
489: #if 0 /* notyet */
490: case M_CSUM_UDPv6|M_CSUM_DATA:
491: #endif
492:
493: case M_CSUM_UDPv6:
494: /* Checksum was okay. */
495: UDP_CSUM_COUNTER_INCR(&udp6_hwcsum_ok);
496: break;
497:
498: default:
499: /*
500: * Need to compute it ourselves. Maybe skip checksum
501: * on loopback interfaces.
502: */
503: UDP_CSUM_COUNTER_INCR(&udp6_swcsum);
504: if (in6_cksum(m, IPPROTO_UDP, off, len) != 0) {
505: udp6stat.udp6s_badsum++;
506: goto bad;
507: }
1.129 yamt 508: }
509:
510: good:
511: return 0;
512: bad:
513: return -1;
514: }
515:
1.53 itojun 516: int
1.119 matt 517: udp6_input(struct mbuf **mp, int *offp, int proto)
1.53 itojun 518: {
519: struct mbuf *m = *mp;
520: int off = *offp;
521: struct sockaddr_in6 src, dst;
522: struct ip6_hdr *ip6;
523: struct udphdr *uh;
524: u_int32_t plen, ulen;
525:
1.76 itojun 526: ip6 = mtod(m, struct ip6_hdr *);
527:
1.53 itojun 528: #if defined(NFAITH) && 0 < NFAITH
1.76 itojun 529: if (faithprefix(&ip6->ip6_dst)) {
530: /* send icmp6 host unreach? */
531: m_freem(m);
532: return IPPROTO_DONE;
1.53 itojun 533: }
534: #endif
535:
536: udp6stat.udp6s_ipackets++;
537:
538: /* check for jumbogram is done in ip6_input. we can trust pkthdr.len */
539: plen = m->m_pkthdr.len - off;
540: IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(struct udphdr));
541: if (uh == NULL) {
542: ip6stat.ip6s_tooshort++;
543: return IPPROTO_DONE;
544: }
1.95 thorpej 545: KASSERT(UDP_HDR_ALIGNED_P(uh));
1.53 itojun 546: ulen = ntohs((u_short)uh->uh_ulen);
1.69 itojun 547: /*
548: * RFC2675 section 4: jumbograms will have 0 in the UDP header field,
549: * iff payload length > 0xffff.
550: */
1.53 itojun 551: if (ulen == 0 && plen > 0xffff)
552: ulen = plen;
553:
554: if (plen != ulen) {
555: udp6stat.udp6s_badlen++;
1.54 itojun 556: goto bad;
557: }
558:
1.57 itojun 559: /* destination port of 0 is illegal, based on RFC768. */
560: if (uh->uh_dport == 0)
561: goto bad;
562:
1.54 itojun 563: /* Be proactive about malicious use of IPv4 mapped address */
564: if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
565: IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
566: /* XXX stat */
1.53 itojun 567: goto bad;
568: }
569:
570: /*
1.125 thorpej 571: * Checksum extended UDP header and data. Maybe skip checksum
572: * on loopback interfaces.
1.53 itojun 573: */
1.129 yamt 574: if (udp6_input_checksum(m, uh, off, ulen))
575: goto bad;
1.53 itojun 576:
577: /*
578: * Construct source and dst sockaddrs.
579: */
580: bzero(&src, sizeof(src));
581: src.sin6_family = AF_INET6;
582: src.sin6_len = sizeof(struct sockaddr_in6);
1.145.2.1! yamt 583: src.sin6_addr = ip6->ip6_src;
1.53 itojun 584: src.sin6_port = uh->uh_sport;
585: bzero(&dst, sizeof(dst));
586: dst.sin6_family = AF_INET6;
587: dst.sin6_len = sizeof(struct sockaddr_in6);
1.145.2.1! yamt 588: dst.sin6_addr = ip6->ip6_dst;
1.53 itojun 589: dst.sin6_port = uh->uh_dport;
590:
591: if (udp6_realinput(AF_INET6, &src, &dst, m, off) == 0) {
592: if (m->m_flags & M_MCAST) {
593: udp6stat.udp6s_noportmcast++;
594: goto bad;
595: }
1.61 itojun 596: udp6stat.udp6s_noport++;
1.53 itojun 597: icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
598: m = NULL;
599: }
600:
601: bad:
602: if (m)
603: m_freem(m);
604: return IPPROTO_DONE;
605: }
606: #endif
607:
1.72 itojun 608: #ifdef INET
1.53 itojun 609: static void
1.119 matt 610: udp4_sendup(struct mbuf *m, int off /* offset of data portion */,
611: struct sockaddr *src, struct socket *so)
1.53 itojun 612: {
613: struct mbuf *opts = NULL;
614: struct mbuf *n;
615: struct inpcb *inp = NULL;
616:
617: if (!so)
618: return;
619: switch (so->so_proto->pr_domain->dom_family) {
620: case AF_INET:
621: inp = sotoinpcb(so);
622: break;
623: #ifdef INET6
624: case AF_INET6:
625: break;
626: #endif
627: default:
628: return;
629: }
630:
1.105 jonathan 631: #if defined(IPSEC) || defined(FAST_IPSEC)
1.53 itojun 632: /* check AH/ESP integrity. */
633: if (so != NULL && ipsec4_in_reject_so(m, so)) {
634: ipsecstat.in_polvio++;
1.110 itojun 635: if ((n = m_copy(m, 0, M_COPYALL)) != NULL)
636: icmp_error(n, ICMP_UNREACH, ICMP_UNREACH_ADMIN_PROHIBIT,
637: 0, 0);
1.53 itojun 638: return;
639: }
640: #endif /*IPSEC*/
641:
642: if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
643: if (inp && (inp->inp_flags & INP_CONTROLOPTS
644: || so->so_options & SO_TIMESTAMP)) {
645: struct ip *ip = mtod(n, struct ip *);
646: ip_savecontrol(inp, &opts, ip, n);
647: }
648:
649: m_adj(n, off);
650: if (sbappendaddr(&so->so_rcv, src, n,
651: opts) == 0) {
652: m_freem(n);
653: if (opts)
654: m_freem(opts);
1.124 darrenr 655: so->so_rcv.sb_overflowed++;
1.81 enami 656: udpstat.udps_fullsock++;
1.53 itojun 657: } else
658: sorwakeup(so);
659: }
660: }
1.72 itojun 661: #endif
1.53 itojun 662:
663: #ifdef INET6
664: static void
1.119 matt 665: udp6_sendup(struct mbuf *m, int off /* offset of data portion */,
666: struct sockaddr *src, struct socket *so)
1.53 itojun 667: {
668: struct mbuf *opts = NULL;
669: struct mbuf *n;
670: struct in6pcb *in6p = NULL;
671:
672: if (!so)
673: return;
674: if (so->so_proto->pr_domain->dom_family != AF_INET6)
675: return;
676: in6p = sotoin6pcb(so);
677:
1.105 jonathan 678: #if defined(IPSEC) || defined(FAST_IPSEC)
1.53 itojun 679: /* check AH/ESP integrity. */
680: if (so != NULL && ipsec6_in_reject_so(m, so)) {
681: ipsec6stat.in_polvio++;
1.111 mycroft 682: if ((n = m_copy(m, 0, M_COPYALL)) != NULL)
1.110 itojun 683: icmp6_error(n, ICMP6_DST_UNREACH,
684: ICMP6_DST_UNREACH_ADMIN, 0);
1.53 itojun 685: return;
686: }
687: #endif /*IPSEC*/
688:
689: if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
690: if (in6p && (in6p->in6p_flags & IN6P_CONTROLOPTS
691: || in6p->in6p_socket->so_options & SO_TIMESTAMP)) {
692: struct ip6_hdr *ip6 = mtod(n, struct ip6_hdr *);
693: ip6_savecontrol(in6p, &opts, ip6, n);
694: }
695:
696: m_adj(n, off);
697: if (sbappendaddr(&so->so_rcv, src, n, opts) == 0) {
698: m_freem(n);
699: if (opts)
700: m_freem(opts);
1.124 darrenr 701: so->so_rcv.sb_overflowed++;
1.53 itojun 702: udp6stat.udp6s_fullsock++;
703: } else
704: sorwakeup(so);
705: }
706: }
707: #endif
708:
1.72 itojun 709: #ifdef INET
1.53 itojun 710: static int
1.119 matt 711: udp4_realinput(struct sockaddr_in *src, struct sockaddr_in *dst,
1.144 manu 712: struct mbuf **mp, int off /* offset of udphdr */)
1.53 itojun 713: {
714: u_int16_t *sport, *dport;
715: int rcvcnt;
716: struct in_addr *src4, *dst4;
1.109 itojun 717: struct inpcb_hdr *inph;
1.53 itojun 718: struct inpcb *inp;
1.144 manu 719: struct mbuf *m = *mp;
1.53 itojun 720:
721: rcvcnt = 0;
722: off += sizeof(struct udphdr); /* now, offset of payload */
723:
724: if (src->sin_family != AF_INET || dst->sin_family != AF_INET)
725: goto bad;
726:
727: src4 = &src->sin_addr;
728: sport = &src->sin_port;
729: dst4 = &dst->sin_addr;
730: dport = &dst->sin_port;
731:
1.73 itojun 732: if (IN_MULTICAST(dst4->s_addr) ||
1.53 itojun 733: in_broadcast(*dst4, m->m_pkthdr.rcvif)) {
734: /*
735: * Deliver a multicast or broadcast datagram to *all* sockets
736: * for which the local and remote addresses and ports match
737: * those of the incoming datagram. This allows more than
738: * one process to receive multi/broadcasts on the same port.
739: * (This really ought to be done for unicast datagrams as
740: * well, but that would cause problems with existing
741: * applications that open both address-specific sockets and
742: * a wildcard socket listening to the same port -- they would
743: * end up receiving duplicates of every unicast datagram.
744: * Those applications open the multiple sockets to overcome an
745: * inadequacy of the UDP socket interface, but for backwards
746: * compatibility we avoid the problem here rather than
747: * fixing the interface. Maybe 4.5BSD will remedy this?)
748: */
749:
750: /*
1.92 itojun 751: * KAME note: traditionally we dropped udpiphdr from mbuf here.
1.71 itojun 752: * we need udpiphdr for IPsec processing so we do that later.
1.53 itojun 753: */
754: /*
755: * Locate pcb(s) for datagram.
756: */
1.109 itojun 757: CIRCLEQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) {
758: inp = (struct inpcb *)inph;
759: if (inp->inp_af != AF_INET)
760: continue;
761:
1.53 itojun 762: if (inp->inp_lport != *dport)
763: continue;
764: if (!in_nullhost(inp->inp_laddr)) {
765: if (!in_hosteq(inp->inp_laddr, *dst4))
766: continue;
767: }
768: if (!in_nullhost(inp->inp_faddr)) {
769: if (!in_hosteq(inp->inp_faddr, *src4) ||
770: inp->inp_fport != *sport)
771: continue;
772: }
773:
774: udp4_sendup(m, off, (struct sockaddr *)src,
775: inp->inp_socket);
776: rcvcnt++;
777:
778: /*
779: * Don't look for additional matches if this one does
780: * not have either the SO_REUSEPORT or SO_REUSEADDR
781: * socket options set. This heuristic avoids searching
782: * through all pcbs in the common case of a non-shared
783: * port. It assumes that an application will never
784: * clear these options after setting them.
785: */
786: if ((inp->inp_socket->so_options &
787: (SO_REUSEPORT|SO_REUSEADDR)) == 0)
788: break;
789: }
790: } else {
791: /*
792: * Locate pcb for datagram.
793: */
794: inp = in_pcblookup_connect(&udbtable, *src4, *sport, *dst4, *dport);
795: if (inp == 0) {
796: ++udpstat.udps_pcbhashmiss;
797: inp = in_pcblookup_bind(&udbtable, *dst4, *dport);
1.82 itojun 798: if (inp == 0)
1.53 itojun 799: return rcvcnt;
800: }
801:
1.130 manu 802: #ifdef IPSEC_NAT_T
803: /* Handle ESP over UDP */
804: if (inp->inp_flags & INP_ESPINUDP_ALL) {
805: struct sockaddr *sa = (struct sockaddr *)src;
806:
1.144 manu 807: switch(udp4_espinudp(mp, off, sa, inp->inp_socket)) {
808: case -1: /* Error, m was freeed */
809: rcvcnt = -1;
810: goto bad;
811: break;
812:
813: case 1: /* ESP over UDP */
1.130 manu 814: rcvcnt++;
815: goto bad;
1.144 manu 816: break;
817:
818: case 0: /* plain UDP */
819: default: /* Unexpected */
820: /*
821: * Normal UDP processing will take place
822: * m may have changed.
823: */
824: m = *mp;
825: break;
1.130 manu 826: }
827: }
828: #endif
829:
1.53 itojun 830: udp4_sendup(m, off, (struct sockaddr *)src, inp->inp_socket);
831: rcvcnt++;
832: }
833:
834: bad:
835: return rcvcnt;
836: }
1.72 itojun 837: #endif
1.53 itojun 838:
839: #ifdef INET6
840: static int
1.119 matt 841: udp6_realinput(int af, struct sockaddr_in6 *src, struct sockaddr_in6 *dst,
842: struct mbuf *m, int off)
1.53 itojun 843: {
1.79 itojun 844: u_int16_t sport, dport;
1.53 itojun 845: int rcvcnt;
1.145.2.1! yamt 846: struct in6_addr src6, *dst6;
1.79 itojun 847: const struct in_addr *dst4;
1.109 itojun 848: struct inpcb_hdr *inph;
1.53 itojun 849: struct in6pcb *in6p;
850:
851: rcvcnt = 0;
852: off += sizeof(struct udphdr); /* now, offset of payload */
853:
854: if (af != AF_INET && af != AF_INET6)
855: goto bad;
856: if (src->sin6_family != AF_INET6 || dst->sin6_family != AF_INET6)
857: goto bad;
858:
1.145.2.1! yamt 859: src6 = src->sin6_addr;
! 860: if (sa6_recoverscope(src) != 0) {
! 861: /* XXX: should be impossible. */
! 862: goto bad;
! 863: }
1.79 itojun 864: sport = src->sin6_port;
1.145.2.1! yamt 865:
1.79 itojun 866: dport = dst->sin6_port;
1.88 itojun 867: dst4 = (struct in_addr *)&dst->sin6_addr.s6_addr[12];
1.145.2.1! yamt 868: dst6 = &dst->sin6_addr;
1.53 itojun 869:
1.145.2.1! yamt 870: if (IN6_IS_ADDR_MULTICAST(dst6) ||
1.79 itojun 871: (af == AF_INET && IN_MULTICAST(dst4->s_addr))) {
1.53 itojun 872: /*
873: * Deliver a multicast or broadcast datagram to *all* sockets
874: * for which the local and remote addresses and ports match
875: * those of the incoming datagram. This allows more than
876: * one process to receive multi/broadcasts on the same port.
877: * (This really ought to be done for unicast datagrams as
878: * well, but that would cause problems with existing
879: * applications that open both address-specific sockets and
880: * a wildcard socket listening to the same port -- they would
881: * end up receiving duplicates of every unicast datagram.
882: * Those applications open the multiple sockets to overcome an
883: * inadequacy of the UDP socket interface, but for backwards
884: * compatibility we avoid the problem here rather than
885: * fixing the interface. Maybe 4.5BSD will remedy this?)
886: */
887:
888: /*
1.92 itojun 889: * KAME note: traditionally we dropped udpiphdr from mbuf here.
1.71 itojun 890: * we need udpiphdr for IPsec processing so we do that later.
1.53 itojun 891: */
892: /*
893: * Locate pcb(s) for datagram.
894: */
1.109 itojun 895: CIRCLEQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) {
896: in6p = (struct in6pcb *)inph;
897: if (in6p->in6p_af != AF_INET6)
898: continue;
899:
1.79 itojun 900: if (in6p->in6p_lport != dport)
1.53 itojun 901: continue;
902: if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
1.145.2.1! yamt 903: if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr,
! 904: dst6))
1.53 itojun 905: continue;
1.92 itojun 906: } else {
1.145.2.1! yamt 907: if (IN6_IS_ADDR_V4MAPPED(dst6) &&
1.85 itojun 908: (in6p->in6p_flags & IN6P_IPV6_V6ONLY))
1.55 itojun 909: continue;
910: }
1.53 itojun 911: if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
1.79 itojun 912: if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr,
913: &src6) || in6p->in6p_fport != sport)
1.53 itojun 914: continue;
1.92 itojun 915: } else {
1.79 itojun 916: if (IN6_IS_ADDR_V4MAPPED(&src6) &&
1.85 itojun 917: (in6p->in6p_flags & IN6P_IPV6_V6ONLY))
1.55 itojun 918: continue;
919: }
1.53 itojun 920:
921: udp6_sendup(m, off, (struct sockaddr *)src,
922: in6p->in6p_socket);
923: rcvcnt++;
924:
925: /*
926: * Don't look for additional matches if this one does
927: * not have either the SO_REUSEPORT or SO_REUSEADDR
928: * socket options set. This heuristic avoids searching
929: * through all pcbs in the common case of a non-shared
930: * port. It assumes that an application will never
931: * clear these options after setting them.
932: */
933: if ((in6p->in6p_socket->so_options &
934: (SO_REUSEPORT|SO_REUSEADDR)) == 0)
935: break;
936: }
937: } else {
938: /*
939: * Locate pcb for datagram.
940: */
1.145.2.1! yamt 941: in6p = in6_pcblookup_connect(&udbtable, &src6, sport, dst6,
! 942: dport, 0);
1.53 itojun 943: if (in6p == 0) {
944: ++udpstat.udps_pcbhashmiss;
1.145.2.1! yamt 945: in6p = in6_pcblookup_bind(&udbtable, dst6, dport, 0);
1.82 itojun 946: if (in6p == 0)
1.53 itojun 947: return rcvcnt;
948: }
949:
950: udp6_sendup(m, off, (struct sockaddr *)src, in6p->in6p_socket);
951: rcvcnt++;
952: }
953:
954: bad:
955: return rcvcnt;
956: }
957: #endif
1.1 cgd 958:
1.72 itojun 959: #ifdef INET
1.1 cgd 960: /*
961: * Notify a udp user of an asynchronous error;
962: * just wake up so that he can collect error status.
963: */
1.7 mycroft 964: static void
1.119 matt 965: udp_notify(struct inpcb *inp, int errno)
1.1 cgd 966: {
967: inp->inp_socket->so_error = errno;
968: sorwakeup(inp->inp_socket);
969: sowwakeup(inp->inp_socket);
970: }
971:
1.27 christos 972: void *
1.119 matt 973: udp_ctlinput(int cmd, struct sockaddr *sa, void *v)
1.1 cgd 974: {
1.66 augustss 975: struct ip *ip = v;
976: struct udphdr *uh;
1.119 matt 977: void (*notify)(struct inpcb *, int) = udp_notify;
1.21 mycroft 978: int errno;
1.1 cgd 979:
1.53 itojun 980: if (sa->sa_family != AF_INET
981: || sa->sa_len != sizeof(struct sockaddr_in))
1.51 itojun 982: return NULL;
1.20 mycroft 983: if ((unsigned)cmd >= PRC_NCMDS)
1.27 christos 984: return NULL;
1.20 mycroft 985: errno = inetctlerrmap[cmd];
1.18 mycroft 986: if (PRC_IS_REDIRECT(cmd))
1.19 mycroft 987: notify = in_rtchange, ip = 0;
1.18 mycroft 988: else if (cmd == PRC_HOSTDEAD)
1.19 mycroft 989: ip = 0;
1.23 cgd 990: else if (errno == 0)
1.27 christos 991: return NULL;
1.19 mycroft 992: if (ip) {
1.1 cgd 993: uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
1.34 mycroft 994: in_pcbnotify(&udbtable, satosin(sa)->sin_addr, uh->uh_dport,
995: ip->ip_src, uh->uh_sport, errno, notify);
1.53 itojun 996:
997: /* XXX mapped address case */
1.19 mycroft 998: } else
1.34 mycroft 999: in_pcbnotifyall(&udbtable, satosin(sa)->sin_addr, errno,
1000: notify);
1.27 christos 1001: return NULL;
1.1 cgd 1002: }
1003:
1.7 mycroft 1004: int
1.131 perry 1005: udp_ctloutput(op, so, level, optname, mp)
1.130 manu 1006: int op;
1007: struct socket *so;
1008: int level, optname;
1009: struct mbuf **mp;
1010: {
1011: int s;
1012: int error = 0;
1013: struct mbuf *m;
1014: struct inpcb *inp;
1015: int family;
1016:
1017: family = so->so_proto->pr_domain->dom_family;
1018:
1019: s = splsoftnet();
1020: switch (family) {
1021: #ifdef INET
1022: case PF_INET:
1023: if (level != IPPROTO_UDP) {
1024: error = ip_ctloutput(op, so, level, optname, mp);
1025: goto end;
1026: }
1027: break;
1028: #endif
1029: #ifdef INET6
1030: case PF_INET6:
1031: if (level != IPPROTO_UDP) {
1032: error = ip6_ctloutput(op, so, level, optname, mp);
1033: goto end;
1034: }
1035: break;
1036: #endif
1037: default:
1038: error = EAFNOSUPPORT;
1039: goto end;
1040: break;
1041: }
1042:
1043:
1044: switch (op) {
1045: case PRCO_SETOPT:
1046: m = *mp;
1047: inp = sotoinpcb(so);
1048:
1049: switch (optname) {
1050: case UDP_ENCAP:
1051: if (m == NULL || m->m_len < sizeof (int)) {
1052: error = EINVAL;
1053: goto end;
1054: }
1.131 perry 1055:
1.130 manu 1056: switch(*mtod(m, int *)) {
1057: #ifdef IPSEC_NAT_T
1058: case 0:
1059: inp->inp_flags &= ~INP_ESPINUDP_ALL;
1060: break;
1061:
1062: case UDP_ENCAP_ESPINUDP:
1063: inp->inp_flags &= ~INP_ESPINUDP_ALL;
1064: inp->inp_flags |= INP_ESPINUDP;
1065: break;
1.131 perry 1066:
1.130 manu 1067: case UDP_ENCAP_ESPINUDP_NON_IKE:
1068: inp->inp_flags &= ~INP_ESPINUDP_ALL;
1069: inp->inp_flags |= INP_ESPINUDP_NON_IKE;
1070: break;
1071: #endif
1072: default:
1073: error = EINVAL;
1074: goto end;
1075: break;
1076: }
1077: break;
1078:
1079: default:
1080: error = ENOPROTOOPT;
1081: goto end;
1082: break;
1083: }
1084: break;
1085:
1086: default:
1087: error = EINVAL;
1088: goto end;
1089: break;
1.131 perry 1090: }
1091:
1.130 manu 1092: end:
1093: splx(s);
1094: return error;
1095: }
1.131 perry 1096:
1.130 manu 1097:
1098: int
1.27 christos 1099: udp_output(struct mbuf *m, ...)
1100: {
1.66 augustss 1101: struct inpcb *inp;
1102: struct udpiphdr *ui;
1.125 thorpej 1103: struct route *ro;
1.66 augustss 1104: int len = m->m_pkthdr.len;
1.31 mycroft 1105: int error = 0;
1.27 christos 1106: va_list ap;
1107:
1.98 matt 1108: MCLAIM(m, &udp_tx_mowner);
1.27 christos 1109: va_start(ap, m);
1110: inp = va_arg(ap, struct inpcb *);
1111: va_end(ap);
1.1 cgd 1112:
1113: /*
1114: * Calculate data length and get a mbuf
1115: * for UDP and IP headers.
1116: */
1.13 mycroft 1117: M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT);
1118: if (m == 0) {
1119: error = ENOBUFS;
1.39 thorpej 1120: goto release;
1121: }
1122:
1123: /*
1124: * Compute the packet length of the IP header, and
1125: * punt if the length looks bogus.
1126: */
1.96 itojun 1127: if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) {
1.39 thorpej 1128: error = EMSGSIZE;
1.13 mycroft 1129: goto release;
1130: }
1.1 cgd 1131:
1132: /*
1133: * Fill in mbuf with extended UDP header
1134: * and addresses and length put into network format.
1135: */
1136: ui = mtod(m, struct udpiphdr *);
1137: ui->ui_pr = IPPROTO_UDP;
1138: ui->ui_src = inp->inp_laddr;
1139: ui->ui_dst = inp->inp_faddr;
1140: ui->ui_sport = inp->inp_lport;
1141: ui->ui_dport = inp->inp_fport;
1.78 thorpej 1142: ui->ui_ulen = htons((u_int16_t)len + sizeof(struct udphdr));
1.1 cgd 1143:
1.125 thorpej 1144: ro = &inp->inp_route;
1145:
1.1 cgd 1146: /*
1.78 thorpej 1147: * Set up checksum and output datagram.
1.1 cgd 1148: */
1149: if (udpcksum) {
1.78 thorpej 1150: /*
1151: * XXX Cache pseudo-header checksum part for
1152: * XXX "connected" UDP sockets.
1153: */
1154: ui->ui_sum = in_cksum_phdr(ui->ui_src.s_addr,
1155: ui->ui_dst.s_addr, htons((u_int16_t)len +
1156: sizeof(struct udphdr) + IPPROTO_UDP));
1.135 yamt 1157: m->m_pkthdr.csum_flags = M_CSUM_UDPv4;
1.78 thorpej 1158: m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
1159: } else
1160: ui->ui_sum = 0;
1.96 itojun 1161: ((struct ip *)ui)->ip_len = htons(sizeof (struct udpiphdr) + len);
1.1 cgd 1162: ((struct ip *)ui)->ip_ttl = inp->inp_ip.ip_ttl; /* XXX */
1163: ((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; /* XXX */
1164: udpstat.udps_opackets++;
1.48 itojun 1165:
1.125 thorpej 1166: return (ip_output(m, inp->inp_options, ro,
1.12 mycroft 1167: inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST),
1.107 itojun 1168: inp->inp_moptions, inp->inp_socket));
1.1 cgd 1169:
1170: release:
1171: m_freem(m);
1172: return (error);
1173: }
1174:
1.42 thorpej 1175: int udp_sendspace = 9216; /* really max datagram size */
1176: int udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in));
1.1 cgd 1177: /* 40 1K datagrams */
1178:
1179: /*ARGSUSED*/
1.7 mycroft 1180: int
1.119 matt 1181: udp_usrreq(struct socket *so, int req, struct mbuf *m, struct mbuf *nam,
1.145 christos 1182: struct mbuf *control, struct lwp *l)
1.1 cgd 1183: {
1.66 augustss 1184: struct inpcb *inp;
1.145 christos 1185: struct proc *p;
1.1 cgd 1186: int s;
1.66 augustss 1187: int error = 0;
1.1 cgd 1188:
1.145 christos 1189: p = l ? l->l_proc : NULL;
1.1 cgd 1190: if (req == PRU_CONTROL)
1.31 mycroft 1191: return (in_control(so, (long)m, (caddr_t)nam,
1.30 mycroft 1192: (struct ifnet *)control, p));
1.59 thorpej 1193:
1.60 thorpej 1194: if (req == PRU_PURGEIF) {
1.80 itojun 1195: in_pcbpurgeif0(&udbtable, (struct ifnet *)control);
1.60 thorpej 1196: in_purgeif((struct ifnet *)control);
1197: in_pcbpurgeif(&udbtable, (struct ifnet *)control);
1.59 thorpej 1198: return (0);
1199: }
1.31 mycroft 1200:
1201: s = splsoftnet();
1202: inp = sotoinpcb(so);
1.32 mycroft 1203: #ifdef DIAGNOSTIC
1204: if (req != PRU_SEND && req != PRU_SENDOOB && control)
1205: panic("udp_usrreq: unexpected control mbuf");
1206: #endif
1.31 mycroft 1207: if (inp == 0 && req != PRU_ATTACH) {
1208: error = EINVAL;
1209: goto release;
1210: }
1211:
1.1 cgd 1212: /*
1213: * Note: need to block udp_input while changing
1214: * the udp pcb queue and/or pcb addresses.
1215: */
1216: switch (req) {
1217:
1218: case PRU_ATTACH:
1.31 mycroft 1219: if (inp != 0) {
1220: error = EISCONN;
1.1 cgd 1221: break;
1222: }
1.98 matt 1223: #ifdef MBUFTRACE
1224: so->so_mowner = &udp_mowner;
1225: so->so_rcv.sb_mowner = &udp_rx_mowner;
1226: so->so_snd.sb_mowner = &udp_tx_mowner;
1227: #endif
1.31 mycroft 1228: if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
1229: error = soreserve(so, udp_sendspace, udp_recvspace);
1230: if (error)
1231: break;
1232: }
1.18 mycroft 1233: error = in_pcballoc(so, &udbtable);
1.1 cgd 1234: if (error)
1235: break;
1.31 mycroft 1236: inp = sotoinpcb(so);
1237: inp->inp_ip.ip_ttl = ip_defttl;
1.1 cgd 1238: break;
1239:
1240: case PRU_DETACH:
1.31 mycroft 1241: in_pcbdetach(inp);
1.1 cgd 1242: break;
1243:
1244: case PRU_BIND:
1.31 mycroft 1245: error = in_pcbbind(inp, nam, p);
1.1 cgd 1246: break;
1247:
1248: case PRU_LISTEN:
1249: error = EOPNOTSUPP;
1250: break;
1251:
1252: case PRU_CONNECT:
1.143 dsl 1253: error = in_pcbconnect(inp, nam, p);
1.31 mycroft 1254: if (error)
1.1 cgd 1255: break;
1.31 mycroft 1256: soisconnected(so);
1.1 cgd 1257: break;
1258:
1259: case PRU_CONNECT2:
1260: error = EOPNOTSUPP;
1261: break;
1262:
1263: case PRU_DISCONNECT:
1.31 mycroft 1264: /*soisdisconnected(so);*/
1265: so->so_state &= ~SS_ISCONNECTED; /* XXX */
1.1 cgd 1266: in_pcbdisconnect(inp);
1.34 mycroft 1267: inp->inp_laddr = zeroin_addr; /* XXX */
1.35 mycroft 1268: in_pcbstate(inp, INP_BOUND); /* XXX */
1.1 cgd 1269: break;
1270:
1271: case PRU_SHUTDOWN:
1272: socantsendmore(so);
1273: break;
1274:
1.31 mycroft 1275: case PRU_RCVD:
1276: error = EOPNOTSUPP;
1.1 cgd 1277: break;
1278:
1.31 mycroft 1279: case PRU_SEND:
1.32 mycroft 1280: if (control && control->m_len) {
1281: m_freem(control);
1282: m_freem(m);
1283: error = EINVAL;
1284: break;
1285: }
1.31 mycroft 1286: {
1.35 mycroft 1287: struct in_addr laddr; /* XXX */
1.1 cgd 1288:
1.31 mycroft 1289: if (nam) {
1.35 mycroft 1290: laddr = inp->inp_laddr; /* XXX */
1.31 mycroft 1291: if ((so->so_state & SS_ISCONNECTED) != 0) {
1292: error = EISCONN;
1.32 mycroft 1293: goto die;
1.31 mycroft 1294: }
1.143 dsl 1295: error = in_pcbconnect(inp, nam, p);
1.100 matt 1296: if (error)
1297: goto die;
1.31 mycroft 1298: } else {
1299: if ((so->so_state & SS_ISCONNECTED) == 0) {
1300: error = ENOTCONN;
1.32 mycroft 1301: goto die;
1.31 mycroft 1302: }
1303: }
1.33 mycroft 1304: error = udp_output(m, inp);
1.100 matt 1305: m = NULL;
1.31 mycroft 1306: if (nam) {
1307: in_pcbdisconnect(inp);
1.35 mycroft 1308: inp->inp_laddr = laddr; /* XXX */
1309: in_pcbstate(inp, INP_BOUND); /* XXX */
1.31 mycroft 1310: }
1.100 matt 1311: die:
1312: if (m)
1313: m_freem(m);
1.31 mycroft 1314: }
1.1 cgd 1315: break;
1316:
1317: case PRU_SENSE:
1318: /*
1319: * stat: don't bother with a blocksize.
1320: */
1.31 mycroft 1321: splx(s);
1.1 cgd 1322: return (0);
1323:
1.31 mycroft 1324: case PRU_RCVOOB:
1325: error = EOPNOTSUPP;
1326: break;
1327:
1.1 cgd 1328: case PRU_SENDOOB:
1.32 mycroft 1329: m_freem(control);
1.31 mycroft 1330: m_freem(m);
1.1 cgd 1331: error = EOPNOTSUPP;
1332: break;
1333:
1.31 mycroft 1334: case PRU_SOCKADDR:
1335: in_setsockaddr(inp, nam);
1336: break;
1337:
1338: case PRU_PEERADDR:
1339: in_setpeeraddr(inp, nam);
1340: break;
1.1 cgd 1341:
1342: default:
1343: panic("udp_usrreq");
1344: }
1345:
1346: release:
1.31 mycroft 1347: splx(s);
1.1 cgd 1348: return (error);
1.13 mycroft 1349: }
1350:
1351: /*
1352: * Sysctl for udp variables.
1353: */
1.114 atatat 1354: SYSCTL_SETUP(sysctl_net_inet_udp_setup, "sysctl net.inet.udp subtree setup")
1.13 mycroft 1355: {
1.114 atatat 1356:
1.116 atatat 1357: sysctl_createv(clog, 0, NULL, NULL,
1358: CTLFLAG_PERMANENT,
1.114 atatat 1359: CTLTYPE_NODE, "net", NULL,
1360: NULL, 0, NULL, 0,
1361: CTL_NET, CTL_EOL);
1.116 atatat 1362: sysctl_createv(clog, 0, NULL, NULL,
1363: CTLFLAG_PERMANENT,
1.114 atatat 1364: CTLTYPE_NODE, "inet", NULL,
1365: NULL, 0, NULL, 0,
1366: CTL_NET, PF_INET, CTL_EOL);
1.116 atatat 1367: sysctl_createv(clog, 0, NULL, NULL,
1368: CTLFLAG_PERMANENT,
1.122 atatat 1369: CTLTYPE_NODE, "udp",
1370: SYSCTL_DESCR("UDPv4 related settings"),
1.114 atatat 1371: NULL, 0, NULL, 0,
1372: CTL_NET, PF_INET, IPPROTO_UDP, CTL_EOL);
1373:
1.116 atatat 1374: sysctl_createv(clog, 0, NULL, NULL,
1375: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122 atatat 1376: CTLTYPE_INT, "checksum",
1.123 heas 1377: SYSCTL_DESCR("Compute UDP checksums"),
1.114 atatat 1378: NULL, 0, &udpcksum, 0,
1379: CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_CHECKSUM,
1380: CTL_EOL);
1.116 atatat 1381: sysctl_createv(clog, 0, NULL, NULL,
1382: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122 atatat 1383: CTLTYPE_INT, "sendspace",
1384: SYSCTL_DESCR("Default UDP send buffer size"),
1.114 atatat 1385: NULL, 0, &udp_sendspace, 0,
1386: CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_SENDSPACE,
1387: CTL_EOL);
1.116 atatat 1388: sysctl_createv(clog, 0, NULL, NULL,
1389: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122 atatat 1390: CTLTYPE_INT, "recvspace",
1391: SYSCTL_DESCR("Default UDP receive buffer size"),
1.114 atatat 1392: NULL, 0, &udp_recvspace, 0,
1393: CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_RECVSPACE,
1394: CTL_EOL);
1.125 thorpej 1395: sysctl_createv(clog, 0, NULL, NULL,
1396: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1397: CTLTYPE_INT, "do_loopback_cksum",
1398: SYSCTL_DESCR("Perform UDP checksum on loopback"),
1399: NULL, 0, &udp_do_loopback_cksum, 0,
1400: CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_LOOPBACKCKSUM,
1401: CTL_EOL);
1.132 atatat 1402: sysctl_createv(clog, 0, NULL, NULL,
1403: CTLFLAG_PERMANENT,
1.134 atatat 1404: CTLTYPE_STRUCT, "pcblist",
1.132 atatat 1405: SYSCTL_DESCR("UDP protocol control block list"),
1406: sysctl_inpcblist, 0, &udbtable, 0,
1407: CTL_NET, PF_INET, IPPROTO_UDP, CTL_CREATE,
1408: CTL_EOL);
1.139 elad 1409: sysctl_createv(clog, 0, NULL, NULL,
1410: CTLFLAG_PERMANENT,
1411: CTLTYPE_STRUCT, "stats",
1412: SYSCTL_DESCR("UDP statistics"),
1413: NULL, 0, &udpstat, sizeof(udpstat),
1414: CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_STATS,
1415: CTL_EOL);
1.1 cgd 1416: }
1.72 itojun 1417: #endif
1.130 manu 1418:
1419: #if (defined INET && defined IPSEC_NAT_T)
1420: /*
1421: * Returns:
1422: * 1 if the packet was processed
1423: * 0 if normal UDP processing should take place
1.144 manu 1424: * -1 if an error occurent and m was freed
1.130 manu 1425: */
1426: static int
1.144 manu 1427: udp4_espinudp(mp, off, src, so)
1428: struct mbuf **mp;
1.130 manu 1429: int off;
1430: struct sockaddr *src;
1431: struct socket *so;
1432: {
1433: size_t len;
1434: caddr_t data;
1435: struct inpcb *inp;
1436: size_t skip = 0;
1437: size_t minlen;
1438: size_t iphdrlen;
1439: struct ip *ip;
1440: struct mbuf *n;
1.136 manu 1441: struct m_tag *tag;
1442: struct udphdr *udphdr;
1443: u_int16_t sport, dport;
1.144 manu 1444: struct mbuf *m = *mp;
1.130 manu 1445:
1.131 perry 1446: /*
1.130 manu 1447: * Collapse the mbuf chain if the first mbuf is too short
1448: * The longest case is: UDP + non ESP marker + ESP
1449: */
1450: minlen = off + sizeof(u_int64_t) + sizeof(struct esp);
1451: if (minlen > m->m_pkthdr.len)
1452: minlen = m->m_pkthdr.len;
1453:
1454: if (m->m_len < minlen) {
1.144 manu 1455: if ((*mp = m_pullup(m, minlen)) == NULL) {
1.130 manu 1456: printf("udp4_espinudp: m_pullup failed\n");
1.144 manu 1457: return -1;
1.130 manu 1458: }
1.144 manu 1459: m = *mp;
1.130 manu 1460: }
1461:
1.131 perry 1462: len = m->m_len - off;
1.130 manu 1463: data = mtod(m, caddr_t) + off;
1464: inp = sotoinpcb(so);
1465:
1466: /* Ignore keepalive packets */
1467: if ((len == 1) && (data[0] == '\xff')) {
1468: return 1;
1469: }
1470:
1.131 perry 1471: /*
1472: * Check that the payload is long enough to hold
1.130 manu 1473: * an ESP header and compute the length of encapsulation
1.131 perry 1474: * header to remove
1.130 manu 1475: */
1476: if (inp->inp_flags & INP_ESPINUDP) {
1477: u_int32_t *st = (u_int32_t *)data;
1478:
1479: if ((len <= sizeof(struct esp)) || (*st == 0))
1480: return 0; /* Normal UDP processing */
1481:
1482: skip = sizeof(struct udphdr);
1483: }
1484:
1485: if (inp->inp_flags & INP_ESPINUDP_NON_IKE) {
1.142 kleink 1486: u_int32_t *st = (u_int32_t *)data;
1.130 manu 1487:
1488: if ((len <= sizeof(u_int64_t) + sizeof(struct esp))
1.142 kleink 1489: || ((st[0] | st[1]) != 0))
1.130 manu 1490: return 0; /* Normal UDP processing */
1.131 perry 1491:
1.130 manu 1492: skip = sizeof(struct udphdr) + sizeof(u_int64_t);
1493: }
1494:
1495: /*
1.136 manu 1496: * Get the UDP ports. They are handled in network
1497: * order everywhere in IPSEC_NAT_T code.
1498: */
1499: udphdr = (struct udphdr *)(data - skip);
1500: sport = udphdr->uh_sport;
1501: dport = udphdr->uh_dport;
1502:
1503: /*
1.130 manu 1504: * Remove the UDP header (and possibly the non ESP marker)
1505: * IP header lendth is iphdrlen
1.131 perry 1506: * Before:
1.130 manu 1507: * <--- off --->
1508: * +----+------+-----+
1509: * | IP | UDP | ESP |
1510: * +----+------+-----+
1511: * <-skip->
1512: * After:
1513: * +----+-----+
1514: * | IP | ESP |
1515: * +----+-----+
1516: * <-skip->
1517: */
1518: iphdrlen = off - sizeof(struct udphdr);
1519: memmove(mtod(m, caddr_t) + skip, mtod(m, caddr_t), iphdrlen);
1520: m_adj(m, skip);
1521:
1522: ip = mtod(m, struct ip *);
1523: ip->ip_len = htons(ntohs(ip->ip_len) - skip);
1524: ip->ip_p = IPPROTO_ESP;
1525:
1526: /*
1.131 perry 1527: * Copy the mbuf to avoid multiple free, as both
1528: * esp4_input (which we call) and udp_input (which
1.130 manu 1529: * called us) free the mbuf.
1530: */
1531: if ((n = m_dup(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
1532: printf("udp4_espinudp: m_dup failed\n");
1533: return 0;
1534: }
1535:
1.136 manu 1536: /*
1537: * Add a PACKET_TAG_IPSEC_NAT_T_PORT tag to remember
1538: * the source UDP port. This is required if we want
1539: * to select the right SPD for multiple hosts behind
1540: * same NAT
1541: */
1.137 manu 1542: if ((tag = m_tag_get(PACKET_TAG_IPSEC_NAT_T_PORTS,
1543: sizeof(sport) + sizeof(dport), M_DONTWAIT)) == NULL) {
1544: printf("udp4_espinudp: m_tag_get failed\n");
1.138 manu 1545: m_freem(n);
1.137 manu 1546: return 0;
1547: }
1.136 manu 1548: ((u_int16_t *)(tag + 1))[0] = sport;
1549: ((u_int16_t *)(tag + 1))[1] = dport;
1550: m_tag_prepend(n, tag);
1551:
1.130 manu 1552: esp4_input(n, iphdrlen);
1553:
1554: /* We handled it, it shoudln't be handled by UDP */
1555: return 1;
1556: }
1557: #endif
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