Annotation of src/sys/netinet/udp_usrreq.c, Revision 1.217.4.4
1.217.4.4! skrll 1: /* $NetBSD: udp_usrreq.c,v 1.217.4.3 2015/09/22 12:06:11 skrll 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:
1.198 rmind 63: /*
64: * UDP protocol implementation.
65: * Per RFC 768, August, 1980.
66: */
67:
1.91 lukem 68: #include <sys/cdefs.h>
1.217.4.4! skrll 69: __KERNEL_RCSID(0, "$NetBSD: udp_usrreq.c,v 1.217.4.3 2015/09/22 12:06:11 skrll Exp $");
1.50 thorpej 70:
1.217.4.3 skrll 71: #ifdef _KERNEL_OPT
1.77 soda 72: #include "opt_inet.h"
1.174 christos 73: #include "opt_compat_netbsd.h"
1.50 thorpej 74: #include "opt_ipsec.h"
1.78 thorpej 75: #include "opt_inet_csum.h"
1.64 ws 76: #include "opt_ipkdb.h"
1.101 martin 77: #include "opt_mbuftrace.h"
1.217.4.3 skrll 78: #endif
1.1 cgd 79:
1.5 mycroft 80: #include <sys/param.h>
81: #include <sys/mbuf.h>
1.192 pooka 82: #include <sys/once.h>
1.5 mycroft 83: #include <sys/protosw.h>
84: #include <sys/socket.h>
85: #include <sys/socketvar.h>
1.27 christos 86: #include <sys/systm.h>
87: #include <sys/proc.h>
1.53 itojun 88: #include <sys/domain.h>
1.27 christos 89: #include <sys/sysctl.h>
1.1 cgd 90:
1.5 mycroft 91: #include <net/if.h>
92: #include <net/route.h>
1.1 cgd 93:
1.5 mycroft 94: #include <netinet/in.h>
95: #include <netinet/in_systm.h>
1.15 cgd 96: #include <netinet/in_var.h>
1.5 mycroft 97: #include <netinet/ip.h>
98: #include <netinet/in_pcb.h>
99: #include <netinet/ip_var.h>
100: #include <netinet/ip_icmp.h>
101: #include <netinet/udp.h>
102: #include <netinet/udp_var.h>
1.166 thorpej 103: #include <netinet/udp_private.h>
1.1 cgd 104:
1.53 itojun 105: #ifdef INET6
106: #include <netinet/ip6.h>
107: #include <netinet/icmp6.h>
108: #include <netinet6/ip6_var.h>
1.167 thorpej 109: #include <netinet6/ip6_private.h>
1.53 itojun 110: #include <netinet6/in6_pcb.h>
111: #include <netinet6/udp6_var.h>
1.168 thorpej 112: #include <netinet6/udp6_private.h>
1.53 itojun 113: #endif
114:
115: #ifndef INET6
116: /* always need ip6.h for IP6_EXTHDR_GET */
117: #include <netinet/ip6.h>
118: #endif
119:
1.190 christos 120: #ifdef IPSEC
1.105 jonathan 121: #include <netipsec/ipsec.h>
1.169 thorpej 122: #include <netipsec/ipsec_var.h>
123: #include <netipsec/ipsec_private.h>
1.147 christos 124: #include <netipsec/esp.h>
1.105 jonathan 125: #ifdef INET6
126: #include <netipsec/ipsec6.h>
127: #endif
1.190 christos 128: #endif /* IPSEC */
1.105 jonathan 129:
1.174 christos 130: #ifdef COMPAT_50
131: #include <compat/sys/socket.h>
132: #endif
133:
1.64 ws 134: #ifdef IPKDB
135: #include <ipkdb/ipkdb.h>
136: #endif
137:
1.8 mycroft 138: int udpcksum = 1;
1.141 yamt 139: int udp_do_loopback_cksum = 0;
1.93 matt 140:
141: struct inpcbtable udbtable;
1.164 thorpej 142:
1.166 thorpej 143: percpu_t *udpstat_percpu;
1.8 mycroft 144:
1.72 itojun 145: #ifdef INET
1.190 christos 146: #ifdef IPSEC
1.144 manu 147: static int udp4_espinudp (struct mbuf **, int, struct sockaddr *,
1.130 manu 148: struct socket *);
1.189 christos 149: #endif
1.119 matt 150: static void udp4_sendup (struct mbuf *, int, struct sockaddr *,
151: struct socket *);
152: static int udp4_realinput (struct sockaddr_in *, struct sockaddr_in *,
1.144 manu 153: struct mbuf **, int);
1.129 yamt 154: static int udp4_input_checksum(struct mbuf *, const struct udphdr *, int, int);
1.72 itojun 155: #endif
156: #ifdef INET
1.119 matt 157: static void udp_notify (struct inpcb *, int);
1.72 itojun 158: #endif
1.7 mycroft 159:
1.26 mycroft 160: #ifndef UDBHASHSIZE
161: #define UDBHASHSIZE 128
162: #endif
163: int udbhashsize = UDBHASHSIZE;
164:
1.196 rmind 165: /*
166: * For send - really max datagram size; for receive - 40 1K datagrams.
167: */
168: static int udp_sendspace = 9216;
169: static int udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in));
170:
1.98 matt 171: #ifdef MBUFTRACE
1.150 dogcow 172: struct mowner udp_mowner = MOWNER_INIT("udp", "");
173: struct mowner udp_rx_mowner = MOWNER_INIT("udp", "rx");
174: struct mowner udp_tx_mowner = MOWNER_INIT("udp", "tx");
1.98 matt 175: #endif
176:
1.78 thorpej 177: #ifdef UDP_CSUM_COUNTERS
178: #include <sys/device.h>
179:
1.140 yamt 180: #if defined(INET)
1.78 thorpej 181: struct evcnt udp_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
182: NULL, "udp", "hwcsum bad");
183: struct evcnt udp_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
184: NULL, "udp", "hwcsum ok");
185: struct evcnt udp_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
186: NULL, "udp", "hwcsum data");
187: struct evcnt udp_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
188: NULL, "udp", "swcsum");
189:
1.120 matt 190: EVCNT_ATTACH_STATIC(udp_hwcsum_bad);
191: EVCNT_ATTACH_STATIC(udp_hwcsum_ok);
192: EVCNT_ATTACH_STATIC(udp_hwcsum_data);
193: EVCNT_ATTACH_STATIC(udp_swcsum);
1.140 yamt 194: #endif /* defined(INET) */
195:
196: #define UDP_CSUM_COUNTER_INCR(ev) (ev)->ev_count++
1.78 thorpej 197: #else
198: #define UDP_CSUM_COUNTER_INCR(ev) /* nothing */
199: #endif /* UDP_CSUM_COUNTERS */
200:
1.179 pooka 201: static void sysctl_net_inet_udp_setup(struct sysctllog **);
202:
1.192 pooka 203: static int
204: do_udpinit(void)
1.1 cgd 205: {
1.18 mycroft 206:
1.35 mycroft 207: in_pcbinit(&udbtable, udbhashsize, udbhashsize);
1.193 pooka 208: udpstat_percpu = percpu_alloc(sizeof(uint64_t) * UDP_NSTATS);
1.78 thorpej 209:
1.98 matt 210: MOWNER_ATTACH(&udp_tx_mowner);
211: MOWNER_ATTACH(&udp_rx_mowner);
212: MOWNER_ATTACH(&udp_mowner);
1.166 thorpej 213:
1.192 pooka 214: return 0;
215: }
216:
217: void
218: udp_init_common(void)
219: {
220: static ONCE_DECL(doudpinit);
221:
222: RUN_ONCE(&doudpinit, do_udpinit);
223: }
224:
225: void
226: udp_init(void)
227: {
228:
229: sysctl_net_inet_udp_setup(NULL);
230:
231: udp_init_common();
1.1 cgd 232: }
233:
1.129 yamt 234: /*
235: * Checksum extended UDP header and data.
236: */
237:
238: int
239: udp_input_checksum(int af, struct mbuf *m, const struct udphdr *uh,
240: int iphlen, int len)
241: {
242:
243: switch (af) {
1.72 itojun 244: #ifdef INET
1.129 yamt 245: case AF_INET:
246: return udp4_input_checksum(m, uh, iphlen, len);
247: #endif
248: #ifdef INET6
249: case AF_INET6:
250: return udp6_input_checksum(m, uh, iphlen, len);
251: #endif
252: }
253: #ifdef DIAGNOSTIC
254: panic("udp_input_checksum: unknown af %d", af);
255: #endif
256: /* NOTREACHED */
257: return -1;
258: }
259:
260: #ifdef INET
261:
262: /*
263: * Checksum extended UDP header and data.
264: */
265:
266: static int
267: udp4_input_checksum(struct mbuf *m, const struct udphdr *uh,
268: int iphlen, int len)
269: {
270:
271: /*
272: * XXX it's better to record and check if this mbuf is
273: * already checked.
274: */
275:
276: if (uh->uh_sum == 0)
277: return 0;
278:
279: switch (m->m_pkthdr.csum_flags &
280: ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv4) |
281: M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) {
282: case M_CSUM_UDPv4|M_CSUM_TCP_UDP_BAD:
283: UDP_CSUM_COUNTER_INCR(&udp_hwcsum_bad);
284: goto badcsum;
285:
286: case M_CSUM_UDPv4|M_CSUM_DATA: {
287: u_int32_t hw_csum = m->m_pkthdr.csum_data;
288:
289: UDP_CSUM_COUNTER_INCR(&udp_hwcsum_data);
290: if (m->m_pkthdr.csum_flags & M_CSUM_NO_PSEUDOHDR) {
291: const struct ip *ip =
292: mtod(m, const struct ip *);
293:
294: hw_csum = in_cksum_phdr(ip->ip_src.s_addr,
295: ip->ip_dst.s_addr,
296: htons(hw_csum + len + IPPROTO_UDP));
297: }
298: if ((hw_csum ^ 0xffff) != 0)
299: goto badcsum;
300: break;
301: }
302:
303: case M_CSUM_UDPv4:
304: /* Checksum was okay. */
305: UDP_CSUM_COUNTER_INCR(&udp_hwcsum_ok);
306: break;
307:
308: default:
309: /*
310: * Need to compute it ourselves. Maybe skip checksum
311: * on loopback interfaces.
312: */
313: if (__predict_true(!(m->m_pkthdr.rcvif->if_flags &
314: IFF_LOOPBACK) ||
315: udp_do_loopback_cksum)) {
316: UDP_CSUM_COUNTER_INCR(&udp_swcsum);
317: if (in4_cksum(m, IPPROTO_UDP, iphlen, len) != 0)
318: goto badcsum;
319: }
320: break;
321: }
322:
323: return 0;
324:
325: badcsum:
1.166 thorpej 326: UDP_STATINC(UDP_STAT_BADSUM);
1.129 yamt 327: return -1;
328: }
329:
1.7 mycroft 330: void
1.27 christos 331: udp_input(struct mbuf *m, ...)
1.1 cgd 332: {
1.53 itojun 333: va_list ap;
334: struct sockaddr_in src, dst;
335: struct ip *ip;
336: struct udphdr *uh;
1.97 simonb 337: int iphlen;
1.53 itojun 338: int len;
339: int n;
1.96 itojun 340: u_int16_t ip_len;
1.53 itojun 341:
342: va_start(ap, m);
343: iphlen = va_arg(ap, int);
1.97 simonb 344: (void)va_arg(ap, int); /* ignore value, advance ap */
1.53 itojun 345: va_end(ap);
346:
1.98 matt 347: MCLAIM(m, &udp_rx_mowner);
1.166 thorpej 348: UDP_STATINC(UDP_STAT_IPACKETS);
1.53 itojun 349:
350: /*
351: * Get IP and UDP header together in first mbuf.
352: */
353: ip = mtod(m, struct ip *);
354: IP6_EXTHDR_GET(uh, struct udphdr *, m, iphlen, sizeof(struct udphdr));
355: if (uh == NULL) {
1.166 thorpej 356: UDP_STATINC(UDP_STAT_HDROPS);
1.53 itojun 357: return;
358: }
1.95 thorpej 359: KASSERT(UDP_HDR_ALIGNED_P(uh));
1.53 itojun 360:
1.57 itojun 361: /* destination port of 0 is illegal, based on RFC768. */
362: if (uh->uh_dport == 0)
363: goto bad;
364:
1.53 itojun 365: /*
366: * Make mbuf data length reflect UDP length.
367: * If not enough data to reflect UDP length, drop.
368: */
1.96 itojun 369: ip_len = ntohs(ip->ip_len);
1.53 itojun 370: len = ntohs((u_int16_t)uh->uh_ulen);
1.96 itojun 371: if (ip_len != iphlen + len) {
372: if (ip_len < iphlen + len || len < sizeof(struct udphdr)) {
1.166 thorpej 373: UDP_STATINC(UDP_STAT_BADLEN);
1.53 itojun 374: goto bad;
375: }
1.96 itojun 376: m_adj(m, iphlen + len - ip_len);
1.53 itojun 377: }
378:
379: /*
380: * Checksum extended UDP header and data.
381: */
1.129 yamt 382: if (udp4_input_checksum(m, uh, iphlen, len))
383: goto badcsum;
1.53 itojun 384:
385: /* construct source and dst sockaddrs. */
1.159 dyoung 386: sockaddr_in_init(&src, &ip->ip_src, uh->uh_sport);
387: sockaddr_in_init(&dst, &ip->ip_dst, uh->uh_dport);
1.53 itojun 388:
1.144 manu 389: if ((n = udp4_realinput(&src, &dst, &m, iphlen)) == -1) {
1.166 thorpej 390: UDP_STATINC(UDP_STAT_HDROPS);
1.144 manu 391: return;
392: }
1.188 christos 393: if (m == NULL) {
394: /*
395: * packet has been processed by ESP stuff -
396: * e.g. dropped NAT-T-keep-alive-packet ...
397: */
398: return;
399: }
400: ip = mtod(m, struct ip *);
1.53 itojun 401: #ifdef INET6
402: if (IN_MULTICAST(ip->ip_dst.s_addr) || n == 0) {
403: struct sockaddr_in6 src6, dst6;
404:
1.175 cegger 405: memset(&src6, 0, sizeof(src6));
1.53 itojun 406: src6.sin6_family = AF_INET6;
407: src6.sin6_len = sizeof(struct sockaddr_in6);
1.217.4.4! skrll 408: in6_in_2_v4mapin6(&ip->ip_src, &src6.sin6_addr);
1.53 itojun 409: src6.sin6_port = uh->uh_sport;
1.175 cegger 410: memset(&dst6, 0, sizeof(dst6));
1.53 itojun 411: dst6.sin6_family = AF_INET6;
412: dst6.sin6_len = sizeof(struct sockaddr_in6);
1.217.4.4! skrll 413: in6_in_2_v4mapin6(&ip->ip_dst, &dst6.sin6_addr);
1.53 itojun 414: dst6.sin6_port = uh->uh_dport;
415:
416: n += udp6_realinput(AF_INET, &src6, &dst6, m, iphlen);
417: }
418: #endif
419:
420: if (n == 0) {
421: if (m->m_flags & (M_BCAST | M_MCAST)) {
1.166 thorpej 422: UDP_STATINC(UDP_STAT_NOPORTBCAST);
1.53 itojun 423: goto bad;
424: }
1.166 thorpej 425: UDP_STATINC(UDP_STAT_NOPORT);
1.64 ws 426: #ifdef IPKDB
1.53 itojun 427: if (checkipkdb(&ip->ip_src, uh->uh_sport, uh->uh_dport,
428: m, iphlen + sizeof(struct udphdr),
429: m->m_pkthdr.len - iphlen - sizeof(struct udphdr))) {
430: /*
431: * It was a debugger connect packet,
432: * just drop it now
433: */
434: goto bad;
435: }
436: #endif
437: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
438: m = NULL;
439: }
440:
441: bad:
442: if (m)
443: m_freem(m);
1.78 thorpej 444: return;
445:
446: badcsum:
447: m_freem(m);
1.53 itojun 448: }
1.72 itojun 449: #endif
1.53 itojun 450:
1.72 itojun 451: #ifdef INET
1.53 itojun 452: static void
1.119 matt 453: udp4_sendup(struct mbuf *m, int off /* offset of data portion */,
454: struct sockaddr *src, struct socket *so)
1.53 itojun 455: {
456: struct mbuf *opts = NULL;
457: struct mbuf *n;
458: struct inpcb *inp = NULL;
459:
460: if (!so)
461: return;
462: switch (so->so_proto->pr_domain->dom_family) {
463: case AF_INET:
464: inp = sotoinpcb(so);
465: break;
466: #ifdef INET6
467: case AF_INET6:
468: break;
469: #endif
470: default:
471: return;
472: }
473:
1.190 christos 474: #if defined(IPSEC)
1.53 itojun 475: /* check AH/ESP integrity. */
1.199 christos 476: if (ipsec_used && so != NULL && ipsec4_in_reject_so(m, so)) {
1.169 thorpej 477: IPSEC_STATINC(IPSEC_STAT_IN_POLVIO);
1.162 dyoung 478: if ((n = m_copypacket(m, M_DONTWAIT)) != NULL)
1.110 itojun 479: icmp_error(n, ICMP_UNREACH, ICMP_UNREACH_ADMIN_PROHIBIT,
480: 0, 0);
1.53 itojun 481: return;
482: }
483: #endif /*IPSEC*/
484:
1.162 dyoung 485: if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) {
1.53 itojun 486: if (inp && (inp->inp_flags & INP_CONTROLOPTS
1.174 christos 487: #ifdef SO_OTIMESTAMP
488: || so->so_options & SO_OTIMESTAMP
489: #endif
1.53 itojun 490: || so->so_options & SO_TIMESTAMP)) {
491: struct ip *ip = mtod(n, struct ip *);
492: ip_savecontrol(inp, &opts, ip, n);
493: }
494:
495: m_adj(n, off);
496: if (sbappendaddr(&so->so_rcv, src, n,
497: opts) == 0) {
498: m_freem(n);
499: if (opts)
500: m_freem(opts);
1.124 darrenr 501: so->so_rcv.sb_overflowed++;
1.166 thorpej 502: UDP_STATINC(UDP_STAT_FULLSOCK);
1.53 itojun 503: } else
504: sorwakeup(so);
505: }
506: }
1.72 itojun 507: #endif
1.53 itojun 508:
1.72 itojun 509: #ifdef INET
1.53 itojun 510: static int
1.119 matt 511: udp4_realinput(struct sockaddr_in *src, struct sockaddr_in *dst,
1.144 manu 512: struct mbuf **mp, int off /* offset of udphdr */)
1.53 itojun 513: {
514: u_int16_t *sport, *dport;
515: int rcvcnt;
516: struct in_addr *src4, *dst4;
1.109 itojun 517: struct inpcb_hdr *inph;
1.53 itojun 518: struct inpcb *inp;
1.144 manu 519: struct mbuf *m = *mp;
1.53 itojun 520:
521: rcvcnt = 0;
522: off += sizeof(struct udphdr); /* now, offset of payload */
523:
524: if (src->sin_family != AF_INET || dst->sin_family != AF_INET)
525: goto bad;
526:
527: src4 = &src->sin_addr;
528: sport = &src->sin_port;
529: dst4 = &dst->sin_addr;
530: dport = &dst->sin_port;
531:
1.73 itojun 532: if (IN_MULTICAST(dst4->s_addr) ||
1.53 itojun 533: in_broadcast(*dst4, m->m_pkthdr.rcvif)) {
534: /*
535: * Deliver a multicast or broadcast datagram to *all* sockets
536: * for which the local and remote addresses and ports match
537: * those of the incoming datagram. This allows more than
538: * one process to receive multi/broadcasts on the same port.
539: * (This really ought to be done for unicast datagrams as
540: * well, but that would cause problems with existing
541: * applications that open both address-specific sockets and
542: * a wildcard socket listening to the same port -- they would
543: * end up receiving duplicates of every unicast datagram.
544: * Those applications open the multiple sockets to overcome an
545: * inadequacy of the UDP socket interface, but for backwards
546: * compatibility we avoid the problem here rather than
547: * fixing the interface. Maybe 4.5BSD will remedy this?)
548: */
549:
550: /*
1.92 itojun 551: * KAME note: traditionally we dropped udpiphdr from mbuf here.
1.71 itojun 552: * we need udpiphdr for IPsec processing so we do that later.
1.53 itojun 553: */
554: /*
555: * Locate pcb(s) for datagram.
556: */
1.191 christos 557: TAILQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) {
1.109 itojun 558: inp = (struct inpcb *)inph;
559: if (inp->inp_af != AF_INET)
560: continue;
561:
1.53 itojun 562: if (inp->inp_lport != *dport)
563: continue;
564: if (!in_nullhost(inp->inp_laddr)) {
565: if (!in_hosteq(inp->inp_laddr, *dst4))
566: continue;
567: }
568: if (!in_nullhost(inp->inp_faddr)) {
569: if (!in_hosteq(inp->inp_faddr, *src4) ||
570: inp->inp_fport != *sport)
571: continue;
572: }
573:
574: udp4_sendup(m, off, (struct sockaddr *)src,
575: inp->inp_socket);
576: rcvcnt++;
577:
578: /*
579: * Don't look for additional matches if this one does
580: * not have either the SO_REUSEPORT or SO_REUSEADDR
581: * socket options set. This heuristic avoids searching
582: * through all pcbs in the common case of a non-shared
583: * port. It assumes that an application will never
584: * clear these options after setting them.
585: */
586: if ((inp->inp_socket->so_options &
587: (SO_REUSEPORT|SO_REUSEADDR)) == 0)
588: break;
589: }
590: } else {
591: /*
592: * Locate pcb for datagram.
593: */
1.180 dyoung 594: inp = in_pcblookup_connect(&udbtable, *src4, *sport, *dst4,
595: *dport, 0);
1.53 itojun 596: if (inp == 0) {
1.166 thorpej 597: UDP_STATINC(UDP_STAT_PCBHASHMISS);
1.53 itojun 598: inp = in_pcblookup_bind(&udbtable, *dst4, *dport);
1.82 itojun 599: if (inp == 0)
1.53 itojun 600: return rcvcnt;
601: }
602:
1.190 christos 603: #ifdef IPSEC
1.130 manu 604: /* Handle ESP over UDP */
605: if (inp->inp_flags & INP_ESPINUDP_ALL) {
606: struct sockaddr *sa = (struct sockaddr *)src;
607:
1.144 manu 608: switch(udp4_espinudp(mp, off, sa, inp->inp_socket)) {
609: case -1: /* Error, m was freeed */
610: rcvcnt = -1;
611: goto bad;
612: break;
613:
614: case 1: /* ESP over UDP */
1.130 manu 615: rcvcnt++;
616: goto bad;
1.144 manu 617: break;
618:
619: case 0: /* plain UDP */
620: default: /* Unexpected */
1.217.4.2 skrll 621: /*
622: * Normal UDP processing will take place
1.144 manu 623: * m may have changed.
624: */
625: m = *mp;
626: break;
1.130 manu 627: }
628: }
1.189 christos 629: #endif
1.130 manu 630:
1.178 minskim 631: /*
632: * Check the minimum TTL for socket.
633: */
634: if (mtod(m, struct ip *)->ip_ttl < inp->inp_ip_minttl)
635: goto bad;
636:
1.53 itojun 637: udp4_sendup(m, off, (struct sockaddr *)src, inp->inp_socket);
638: rcvcnt++;
639: }
640:
641: bad:
642: return rcvcnt;
643: }
1.72 itojun 644: #endif
1.53 itojun 645:
1.72 itojun 646: #ifdef INET
1.1 cgd 647: /*
648: * Notify a udp user of an asynchronous error;
649: * just wake up so that he can collect error status.
650: */
1.7 mycroft 651: static void
1.119 matt 652: udp_notify(struct inpcb *inp, int errno)
1.1 cgd 653: {
654: inp->inp_socket->so_error = errno;
655: sorwakeup(inp->inp_socket);
656: sowwakeup(inp->inp_socket);
657: }
658:
1.27 christos 659: void *
1.157 dyoung 660: udp_ctlinput(int cmd, const struct sockaddr *sa, void *v)
1.1 cgd 661: {
1.66 augustss 662: struct ip *ip = v;
663: struct udphdr *uh;
1.119 matt 664: void (*notify)(struct inpcb *, int) = udp_notify;
1.21 mycroft 665: int errno;
1.1 cgd 666:
1.53 itojun 667: if (sa->sa_family != AF_INET
668: || sa->sa_len != sizeof(struct sockaddr_in))
1.51 itojun 669: return NULL;
1.20 mycroft 670: if ((unsigned)cmd >= PRC_NCMDS)
1.27 christos 671: return NULL;
1.20 mycroft 672: errno = inetctlerrmap[cmd];
1.18 mycroft 673: if (PRC_IS_REDIRECT(cmd))
1.19 mycroft 674: notify = in_rtchange, ip = 0;
1.18 mycroft 675: else if (cmd == PRC_HOSTDEAD)
1.19 mycroft 676: ip = 0;
1.23 cgd 677: else if (errno == 0)
1.27 christos 678: return NULL;
1.19 mycroft 679: if (ip) {
1.158 christos 680: uh = (struct udphdr *)((char *)ip + (ip->ip_hl << 2));
1.157 dyoung 681: in_pcbnotify(&udbtable, satocsin(sa)->sin_addr, uh->uh_dport,
1.34 mycroft 682: ip->ip_src, uh->uh_sport, errno, notify);
1.53 itojun 683:
684: /* XXX mapped address case */
1.19 mycroft 685: } else
1.157 dyoung 686: in_pcbnotifyall(&udbtable, satocsin(sa)->sin_addr, errno,
1.34 mycroft 687: notify);
1.27 christos 688: return NULL;
1.1 cgd 689: }
690:
1.7 mycroft 691: int
1.173 plunky 692: udp_ctloutput(int op, struct socket *so, struct sockopt *sopt)
1.130 manu 693: {
694: int s;
695: int error = 0;
696: struct inpcb *inp;
697: int family;
1.173 plunky 698: int optval;
1.130 manu 699:
700: family = so->so_proto->pr_domain->dom_family;
701:
702: s = splsoftnet();
703: switch (family) {
704: #ifdef INET
705: case PF_INET:
1.173 plunky 706: if (sopt->sopt_level != IPPROTO_UDP) {
707: error = ip_ctloutput(op, so, sopt);
1.130 manu 708: goto end;
709: }
710: break;
711: #endif
712: #ifdef INET6
713: case PF_INET6:
1.173 plunky 714: if (sopt->sopt_level != IPPROTO_UDP) {
715: error = ip6_ctloutput(op, so, sopt);
1.130 manu 716: goto end;
717: }
718: break;
719: #endif
720: default:
721: error = EAFNOSUPPORT;
722: goto end;
723: }
724:
725:
726: switch (op) {
727: case PRCO_SETOPT:
728: inp = sotoinpcb(so);
729:
1.173 plunky 730: switch (sopt->sopt_name) {
1.130 manu 731: case UDP_ENCAP:
1.173 plunky 732: error = sockopt_getint(sopt, &optval);
733: if (error)
1.153 yamt 734: break;
1.131 perry 735:
1.173 plunky 736: switch(optval) {
1.130 manu 737: case 0:
738: inp->inp_flags &= ~INP_ESPINUDP_ALL;
739: break;
740:
741: case UDP_ENCAP_ESPINUDP:
742: inp->inp_flags &= ~INP_ESPINUDP_ALL;
743: inp->inp_flags |= INP_ESPINUDP;
744: break;
1.131 perry 745:
1.130 manu 746: case UDP_ENCAP_ESPINUDP_NON_IKE:
747: inp->inp_flags &= ~INP_ESPINUDP_ALL;
748: inp->inp_flags |= INP_ESPINUDP_NON_IKE;
749: break;
750: default:
751: error = EINVAL;
752: break;
753: }
754: break;
1.217.4.2 skrll 755:
1.130 manu 756: default:
757: error = ENOPROTOOPT;
758: break;
759: }
760: break;
761:
762: default:
763: error = EINVAL;
764: break;
1.131 perry 765: }
766:
1.130 manu 767: end:
768: splx(s);
769: return error;
770: }
1.131 perry 771:
1.130 manu 772:
773: int
1.217.4.4! skrll 774: udp_output(struct mbuf *m, struct inpcb *inp)
1.27 christos 775: {
1.66 augustss 776: struct udpiphdr *ui;
1.125 thorpej 777: struct route *ro;
1.66 augustss 778: int len = m->m_pkthdr.len;
1.31 mycroft 779: int error = 0;
1.27 christos 780:
1.98 matt 781: MCLAIM(m, &udp_tx_mowner);
1.1 cgd 782:
783: /*
784: * Calculate data length and get a mbuf
785: * for UDP and IP headers.
786: */
1.13 mycroft 787: M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT);
788: if (m == 0) {
789: error = ENOBUFS;
1.39 thorpej 790: goto release;
791: }
792:
793: /*
794: * Compute the packet length of the IP header, and
795: * punt if the length looks bogus.
796: */
1.96 itojun 797: if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) {
1.39 thorpej 798: error = EMSGSIZE;
1.13 mycroft 799: goto release;
800: }
1.1 cgd 801:
802: /*
803: * Fill in mbuf with extended UDP header
804: * and addresses and length put into network format.
805: */
806: ui = mtod(m, struct udpiphdr *);
807: ui->ui_pr = IPPROTO_UDP;
808: ui->ui_src = inp->inp_laddr;
809: ui->ui_dst = inp->inp_faddr;
810: ui->ui_sport = inp->inp_lport;
811: ui->ui_dport = inp->inp_fport;
1.78 thorpej 812: ui->ui_ulen = htons((u_int16_t)len + sizeof(struct udphdr));
1.1 cgd 813:
1.125 thorpej 814: ro = &inp->inp_route;
815:
1.1 cgd 816: /*
1.78 thorpej 817: * Set up checksum and output datagram.
1.1 cgd 818: */
819: if (udpcksum) {
1.78 thorpej 820: /*
821: * XXX Cache pseudo-header checksum part for
822: * XXX "connected" UDP sockets.
823: */
824: ui->ui_sum = in_cksum_phdr(ui->ui_src.s_addr,
825: ui->ui_dst.s_addr, htons((u_int16_t)len +
826: sizeof(struct udphdr) + IPPROTO_UDP));
1.135 yamt 827: m->m_pkthdr.csum_flags = M_CSUM_UDPv4;
1.78 thorpej 828: m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
829: } else
830: ui->ui_sum = 0;
1.96 itojun 831: ((struct ip *)ui)->ip_len = htons(sizeof (struct udpiphdr) + len);
1.1 cgd 832: ((struct ip *)ui)->ip_ttl = inp->inp_ip.ip_ttl; /* XXX */
833: ((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; /* XXX */
1.166 thorpej 834: UDP_STATINC(UDP_STAT_OPACKETS);
1.48 itojun 835:
1.125 thorpej 836: return (ip_output(m, inp->inp_options, ro,
1.12 mycroft 837: inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST),
1.107 itojun 838: inp->inp_moptions, inp->inp_socket));
1.1 cgd 839:
840: release:
841: m_freem(m);
842: return (error);
843: }
844:
1.196 rmind 845: static int
846: udp_attach(struct socket *so, int proto)
847: {
848: struct inpcb *inp;
849: int error;
850:
851: KASSERT(sotoinpcb(so) == NULL);
852:
853: /* Assign the lock (must happen even if we will error out). */
854: sosetlock(so);
855:
856: #ifdef MBUFTRACE
857: so->so_mowner = &udp_mowner;
858: so->so_rcv.sb_mowner = &udp_rx_mowner;
859: so->so_snd.sb_mowner = &udp_tx_mowner;
860: #endif
861: if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
862: error = soreserve(so, udp_sendspace, udp_recvspace);
863: if (error) {
864: return error;
865: }
866: }
867:
868: error = in_pcballoc(so, &udbtable);
869: if (error) {
870: return error;
871: }
872: inp = sotoinpcb(so);
873: inp->inp_ip.ip_ttl = ip_defttl;
874: KASSERT(solocked(so));
875:
876: return error;
877: }
878:
879: static void
880: udp_detach(struct socket *so)
881: {
882: struct inpcb *inp;
883:
884: KASSERT(solocked(so));
885: inp = sotoinpcb(so);
886: KASSERT(inp != NULL);
887: in_pcbdetach(inp);
888: }
1.1 cgd 889:
1.195 rmind 890: static int
1.217.4.2 skrll 891: udp_accept(struct socket *so, struct sockaddr *nam)
1.208 rtr 892: {
893: KASSERT(solocked(so));
894:
895: panic("udp_accept");
1.210 rtr 896:
1.208 rtr 897: return EOPNOTSUPP;
898: }
899:
900: static int
1.217.4.1 skrll 901: udp_bind(struct socket *so, struct sockaddr *nam, struct lwp *l)
1.210 rtr 902: {
903: struct inpcb *inp = sotoinpcb(so);
1.217.4.1 skrll 904: struct sockaddr_in *sin = (struct sockaddr_in *)nam;
1.210 rtr 905: int error = 0;
906: int s;
907:
908: KASSERT(solocked(so));
909: KASSERT(inp != NULL);
910: KASSERT(nam != NULL);
911:
912: s = splsoftnet();
1.217.4.1 skrll 913: error = in_pcbbind(inp, sin, l);
1.210 rtr 914: splx(s);
915:
916: return error;
917: }
918:
919: static int
1.214 rtr 920: udp_listen(struct socket *so, struct lwp *l)
1.210 rtr 921: {
922: KASSERT(solocked(so));
923:
924: return EOPNOTSUPP;
925: }
926:
1.211 rtr 927: static int
1.217.4.2 skrll 928: udp_connect(struct socket *so, struct sockaddr *nam, struct lwp *l)
1.211 rtr 929: {
930: struct inpcb *inp = sotoinpcb(so);
931: int error = 0;
932: int s;
933:
934: KASSERT(solocked(so));
935: KASSERT(inp != NULL);
936: KASSERT(nam != NULL);
937:
938: s = splsoftnet();
1.217.4.2 skrll 939: error = in_pcbconnect(inp, (struct sockaddr_in *)nam, l);
1.211 rtr 940: if (! error)
941: soisconnected(so);
942: splx(s);
943: return error;
944: }
1.210 rtr 945:
946: static int
1.217 rtr 947: udp_connect2(struct socket *so, struct socket *so2)
948: {
949: KASSERT(solocked(so));
950:
951: return EOPNOTSUPP;
952: }
953:
954: static int
1.212 rtr 955: udp_disconnect(struct socket *so)
956: {
957: struct inpcb *inp = sotoinpcb(so);
958: int s;
959:
960: KASSERT(solocked(so));
961: KASSERT(inp != NULL);
962:
963: s = splsoftnet();
964: /*soisdisconnected(so);*/
965: so->so_state &= ~SS_ISCONNECTED; /* XXX */
966: in_pcbdisconnect(inp);
967: inp->inp_laddr = zeroin_addr; /* XXX */
968: in_pcbstate(inp, INP_BOUND); /* XXX */
969: splx(s);
970:
971: return 0;
972: }
973:
974: static int
975: udp_shutdown(struct socket *so)
976: {
977: int s;
978:
979: KASSERT(solocked(so));
980:
981: s = splsoftnet();
982: socantsendmore(so);
983: splx(s);
984:
985: return 0;
986: }
987:
988: static int
989: udp_abort(struct socket *so)
990: {
991: KASSERT(solocked(so));
992:
993: panic("udp_abort");
994:
995: return EOPNOTSUPP;
996: }
997:
998: static int
1.202 rtr 999: udp_ioctl(struct socket *so, u_long cmd, void *nam, struct ifnet *ifp)
1.200 rtr 1000: {
1.202 rtr 1001: return in_control(so, cmd, nam, ifp);
1.200 rtr 1002: }
1003:
1004: static int
1.203 rtr 1005: udp_stat(struct socket *so, struct stat *ub)
1006: {
1.206 rtr 1007: KASSERT(solocked(so));
1008:
1.205 rtr 1009: /* stat: don't bother with a blocksize. */
1010: return 0;
1.203 rtr 1011: }
1012:
1013: static int
1.217.4.2 skrll 1014: udp_peeraddr(struct socket *so, struct sockaddr *nam)
1.207 rtr 1015: {
1.213 rtr 1016: int s;
1017:
1.207 rtr 1018: KASSERT(solocked(so));
1019: KASSERT(sotoinpcb(so) != NULL);
1020: KASSERT(nam != NULL);
1021:
1.213 rtr 1022: s = splsoftnet();
1.217.4.2 skrll 1023: in_setpeeraddr(sotoinpcb(so), (struct sockaddr_in *)nam);
1.213 rtr 1024: splx(s);
1025:
1.207 rtr 1026: return 0;
1027: }
1028:
1029: static int
1.217.4.2 skrll 1030: udp_sockaddr(struct socket *so, struct sockaddr *nam)
1.207 rtr 1031: {
1.213 rtr 1032: int s;
1033:
1.207 rtr 1034: KASSERT(solocked(so));
1035: KASSERT(sotoinpcb(so) != NULL);
1036: KASSERT(nam != NULL);
1037:
1.213 rtr 1038: s = splsoftnet();
1.217.4.2 skrll 1039: in_setsockaddr(sotoinpcb(so), (struct sockaddr_in *)nam);
1.213 rtr 1040: splx(s);
1041:
1.207 rtr 1042: return 0;
1043: }
1044:
1045: static int
1.216 rtr 1046: udp_rcvd(struct socket *so, int flags, struct lwp *l)
1047: {
1048: KASSERT(solocked(so));
1049:
1050: return EOPNOTSUPP;
1051: }
1052:
1053: static int
1.209 rtr 1054: udp_recvoob(struct socket *so, struct mbuf *m, int flags)
1055: {
1056: KASSERT(solocked(so));
1057:
1058: return EOPNOTSUPP;
1059: }
1060:
1061: static int
1.217.4.2 skrll 1062: udp_send(struct socket *so, struct mbuf *m, struct sockaddr *nam,
1.215 rtr 1063: struct mbuf *control, struct lwp *l)
1064: {
1065: struct inpcb *inp = sotoinpcb(so);
1066: int error = 0;
1067: struct in_addr laddr; /* XXX */
1068: int s;
1069:
1070: KASSERT(solocked(so));
1071: KASSERT(inp != NULL);
1072: KASSERT(m != NULL);
1073:
1074: if (control && control->m_len) {
1075: m_freem(control);
1076: m_freem(m);
1077: return EINVAL;
1078: }
1079:
1080: memset(&laddr, 0, sizeof laddr);
1081:
1082: s = splsoftnet();
1083: if (nam) {
1084: laddr = inp->inp_laddr; /* XXX */
1085: if ((so->so_state & SS_ISCONNECTED) != 0) {
1086: error = EISCONN;
1087: goto die;
1088: }
1.217.4.2 skrll 1089: error = in_pcbconnect(inp, (struct sockaddr_in *)nam, l);
1.215 rtr 1090: if (error)
1091: goto die;
1092: } else {
1093: if ((so->so_state & SS_ISCONNECTED) == 0) {
1094: error = ENOTCONN;
1095: goto die;
1096: }
1097: }
1098: error = udp_output(m, inp);
1099: m = NULL;
1100: if (nam) {
1101: in_pcbdisconnect(inp);
1102: inp->inp_laddr = laddr; /* XXX */
1103: in_pcbstate(inp, INP_BOUND); /* XXX */
1104: }
1105: die:
1106: if (m)
1107: m_freem(m);
1108:
1109: splx(s);
1110: return error;
1111: }
1112:
1113: static int
1.209 rtr 1114: udp_sendoob(struct socket *so, struct mbuf *m, struct mbuf *control)
1115: {
1116: KASSERT(solocked(so));
1117:
1118: m_freem(m);
1119: m_freem(control);
1120:
1121: return EOPNOTSUPP;
1122: }
1123:
1124: static int
1.217 rtr 1125: udp_purgeif(struct socket *so, struct ifnet *ifp)
1126: {
1127: int s;
1128:
1129: s = splsoftnet();
1130: mutex_enter(softnet_lock);
1131: in_pcbpurgeif0(&udbtable, ifp);
1132: in_purgeif(ifp);
1133: in_pcbpurgeif(&udbtable, ifp);
1134: mutex_exit(softnet_lock);
1135: splx(s);
1136:
1137: return 0;
1138: }
1139:
1140: static int
1.166 thorpej 1141: sysctl_net_inet_udp_stats(SYSCTLFN_ARGS)
1142: {
1143:
1.172 thorpej 1144: return (NETSTAT_SYSCTL(udpstat_percpu, UDP_NSTATS));
1.166 thorpej 1145: }
1146:
1.13 mycroft 1147: /*
1148: * Sysctl for udp variables.
1149: */
1.179 pooka 1150: static void
1151: sysctl_net_inet_udp_setup(struct sysctllog **clog)
1.13 mycroft 1152: {
1.194 pooka 1153:
1.116 atatat 1154: sysctl_createv(clog, 0, NULL, NULL,
1155: CTLFLAG_PERMANENT,
1.114 atatat 1156: CTLTYPE_NODE, "inet", NULL,
1157: NULL, 0, NULL, 0,
1158: CTL_NET, PF_INET, CTL_EOL);
1.116 atatat 1159: sysctl_createv(clog, 0, NULL, NULL,
1160: CTLFLAG_PERMANENT,
1.122 atatat 1161: CTLTYPE_NODE, "udp",
1162: SYSCTL_DESCR("UDPv4 related settings"),
1.114 atatat 1163: NULL, 0, NULL, 0,
1164: CTL_NET, PF_INET, IPPROTO_UDP, CTL_EOL);
1165:
1.116 atatat 1166: sysctl_createv(clog, 0, NULL, NULL,
1167: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122 atatat 1168: CTLTYPE_INT, "checksum",
1.123 heas 1169: SYSCTL_DESCR("Compute UDP checksums"),
1.114 atatat 1170: NULL, 0, &udpcksum, 0,
1171: CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_CHECKSUM,
1172: CTL_EOL);
1.116 atatat 1173: sysctl_createv(clog, 0, NULL, NULL,
1174: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122 atatat 1175: CTLTYPE_INT, "sendspace",
1176: SYSCTL_DESCR("Default UDP send buffer size"),
1.114 atatat 1177: NULL, 0, &udp_sendspace, 0,
1178: CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_SENDSPACE,
1179: CTL_EOL);
1.116 atatat 1180: sysctl_createv(clog, 0, NULL, NULL,
1181: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122 atatat 1182: CTLTYPE_INT, "recvspace",
1183: SYSCTL_DESCR("Default UDP receive buffer size"),
1.114 atatat 1184: NULL, 0, &udp_recvspace, 0,
1185: CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_RECVSPACE,
1186: CTL_EOL);
1.125 thorpej 1187: sysctl_createv(clog, 0, NULL, NULL,
1188: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1189: CTLTYPE_INT, "do_loopback_cksum",
1190: SYSCTL_DESCR("Perform UDP checksum on loopback"),
1191: NULL, 0, &udp_do_loopback_cksum, 0,
1192: CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_LOOPBACKCKSUM,
1193: CTL_EOL);
1.132 atatat 1194: sysctl_createv(clog, 0, NULL, NULL,
1195: CTLFLAG_PERMANENT,
1.134 atatat 1196: CTLTYPE_STRUCT, "pcblist",
1.132 atatat 1197: SYSCTL_DESCR("UDP protocol control block list"),
1198: sysctl_inpcblist, 0, &udbtable, 0,
1199: CTL_NET, PF_INET, IPPROTO_UDP, CTL_CREATE,
1200: CTL_EOL);
1.139 elad 1201: sysctl_createv(clog, 0, NULL, NULL,
1202: CTLFLAG_PERMANENT,
1203: CTLTYPE_STRUCT, "stats",
1204: SYSCTL_DESCR("UDP statistics"),
1.166 thorpej 1205: sysctl_net_inet_udp_stats, 0, NULL, 0,
1.139 elad 1206: CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_STATS,
1207: CTL_EOL);
1.1 cgd 1208: }
1.72 itojun 1209: #endif
1.130 manu 1210:
1.166 thorpej 1211: void
1212: udp_statinc(u_int stat)
1213: {
1214:
1215: KASSERT(stat < UDP_NSTATS);
1216: UDP_STATINC(stat);
1217: }
1218:
1.190 christos 1219: #if defined(INET) && defined(IPSEC)
1.130 manu 1220: /*
1221: * Returns:
1222: * 1 if the packet was processed
1223: * 0 if normal UDP processing should take place
1.144 manu 1224: * -1 if an error occurent and m was freed
1.130 manu 1225: */
1226: static int
1.154 yamt 1227: udp4_espinudp(struct mbuf **mp, int off, struct sockaddr *src,
1.151 christos 1228: struct socket *so)
1.130 manu 1229: {
1230: size_t len;
1.158 christos 1231: void *data;
1.130 manu 1232: struct inpcb *inp;
1233: size_t skip = 0;
1234: size_t minlen;
1235: size_t iphdrlen;
1236: struct ip *ip;
1.136 manu 1237: struct m_tag *tag;
1238: struct udphdr *udphdr;
1239: u_int16_t sport, dport;
1.144 manu 1240: struct mbuf *m = *mp;
1.130 manu 1241:
1.131 perry 1242: /*
1.130 manu 1243: * Collapse the mbuf chain if the first mbuf is too short
1244: * The longest case is: UDP + non ESP marker + ESP
1245: */
1246: minlen = off + sizeof(u_int64_t) + sizeof(struct esp);
1247: if (minlen > m->m_pkthdr.len)
1248: minlen = m->m_pkthdr.len;
1249:
1250: if (m->m_len < minlen) {
1.144 manu 1251: if ((*mp = m_pullup(m, minlen)) == NULL) {
1.130 manu 1252: printf("udp4_espinudp: m_pullup failed\n");
1.144 manu 1253: return -1;
1.130 manu 1254: }
1.144 manu 1255: m = *mp;
1.130 manu 1256: }
1257:
1.131 perry 1258: len = m->m_len - off;
1.158 christos 1259: data = mtod(m, char *) + off;
1.130 manu 1260: inp = sotoinpcb(so);
1261:
1262: /* Ignore keepalive packets */
1.158 christos 1263: if ((len == 1) && (*(unsigned char *)data == 0xff)) {
1.188 christos 1264: m_free(m);
1265: *mp = NULL; /* avoid any further processiong by caller ... */
1.130 manu 1266: return 1;
1267: }
1268:
1.131 perry 1269: /*
1270: * Check that the payload is long enough to hold
1.130 manu 1271: * an ESP header and compute the length of encapsulation
1.131 perry 1272: * header to remove
1.130 manu 1273: */
1274: if (inp->inp_flags & INP_ESPINUDP) {
1275: u_int32_t *st = (u_int32_t *)data;
1276:
1277: if ((len <= sizeof(struct esp)) || (*st == 0))
1278: return 0; /* Normal UDP processing */
1279:
1280: skip = sizeof(struct udphdr);
1281: }
1282:
1283: if (inp->inp_flags & INP_ESPINUDP_NON_IKE) {
1.142 kleink 1284: u_int32_t *st = (u_int32_t *)data;
1.130 manu 1285:
1286: if ((len <= sizeof(u_int64_t) + sizeof(struct esp))
1.142 kleink 1287: || ((st[0] | st[1]) != 0))
1.130 manu 1288: return 0; /* Normal UDP processing */
1.131 perry 1289:
1.130 manu 1290: skip = sizeof(struct udphdr) + sizeof(u_int64_t);
1291: }
1292:
1293: /*
1.217.4.2 skrll 1294: * Get the UDP ports. They are handled in network
1.136 manu 1295: * order everywhere in IPSEC_NAT_T code.
1296: */
1.158 christos 1297: udphdr = (struct udphdr *)((char *)data - skip);
1.136 manu 1298: sport = udphdr->uh_sport;
1299: dport = udphdr->uh_dport;
1300:
1301: /*
1.130 manu 1302: * Remove the UDP header (and possibly the non ESP marker)
1303: * IP header lendth is iphdrlen
1.131 perry 1304: * Before:
1.130 manu 1305: * <--- off --->
1306: * +----+------+-----+
1307: * | IP | UDP | ESP |
1308: * +----+------+-----+
1309: * <-skip->
1310: * After:
1311: * +----+-----+
1312: * | IP | ESP |
1313: * +----+-----+
1314: * <-skip->
1315: */
1316: iphdrlen = off - sizeof(struct udphdr);
1.158 christos 1317: memmove(mtod(m, char *) + skip, mtod(m, void *), iphdrlen);
1.130 manu 1318: m_adj(m, skip);
1319:
1320: ip = mtod(m, struct ip *);
1321: ip->ip_len = htons(ntohs(ip->ip_len) - skip);
1322: ip->ip_p = IPPROTO_ESP;
1323:
1324: /*
1.188 christos 1325: * We have modified the packet - it is now ESP, so we should not
1.217.4.2 skrll 1326: * return to UDP processing ...
1.188 christos 1327: *
1.136 manu 1328: * Add a PACKET_TAG_IPSEC_NAT_T_PORT tag to remember
1329: * the source UDP port. This is required if we want
1.217.4.2 skrll 1330: * to select the right SPD for multiple hosts behind
1331: * same NAT
1.136 manu 1332: */
1.137 manu 1333: if ((tag = m_tag_get(PACKET_TAG_IPSEC_NAT_T_PORTS,
1334: sizeof(sport) + sizeof(dport), M_DONTWAIT)) == NULL) {
1335: printf("udp4_espinudp: m_tag_get failed\n");
1.188 christos 1336: m_freem(m);
1337: return -1;
1.137 manu 1338: }
1.136 manu 1339: ((u_int16_t *)(tag + 1))[0] = sport;
1340: ((u_int16_t *)(tag + 1))[1] = dport;
1.188 christos 1341: m_tag_prepend(m, tag);
1.136 manu 1342:
1.190 christos 1343: #ifdef IPSEC
1.199 christos 1344: if (ipsec_used)
1345: ipsec4_common_input(m, iphdrlen, IPPROTO_ESP);
1346: /* XXX: else */
1.147 christos 1347: #else
1.188 christos 1348: esp4_input(m, iphdrlen);
1.147 christos 1349: #endif
1.130 manu 1350:
1.185 liamjfoy 1351: /* We handled it, it shouldn't be handled by UDP */
1.188 christos 1352: *mp = NULL; /* avoid free by caller ... */
1.130 manu 1353: return 1;
1354: }
1355: #endif
1.195 rmind 1356:
1.197 rmind 1357: PR_WRAP_USRREQS(udp)
1358: #define udp_attach udp_attach_wrapper
1359: #define udp_detach udp_detach_wrapper
1.208 rtr 1360: #define udp_accept udp_accept_wrapper
1.210 rtr 1361: #define udp_bind udp_bind_wrapper
1362: #define udp_listen udp_listen_wrapper
1.211 rtr 1363: #define udp_connect udp_connect_wrapper
1.217 rtr 1364: #define udp_connect2 udp_connect2_wrapper
1.212 rtr 1365: #define udp_disconnect udp_disconnect_wrapper
1366: #define udp_shutdown udp_shutdown_wrapper
1367: #define udp_abort udp_abort_wrapper
1.200 rtr 1368: #define udp_ioctl udp_ioctl_wrapper
1.203 rtr 1369: #define udp_stat udp_stat_wrapper
1.207 rtr 1370: #define udp_peeraddr udp_peeraddr_wrapper
1371: #define udp_sockaddr udp_sockaddr_wrapper
1.216 rtr 1372: #define udp_rcvd udp_rcvd_wrapper
1.209 rtr 1373: #define udp_recvoob udp_recvoob_wrapper
1.215 rtr 1374: #define udp_send udp_send_wrapper
1.209 rtr 1375: #define udp_sendoob udp_sendoob_wrapper
1.217 rtr 1376: #define udp_purgeif udp_purgeif_wrapper
1.195 rmind 1377:
1378: const struct pr_usrreqs udp_usrreqs = {
1.196 rmind 1379: .pr_attach = udp_attach,
1380: .pr_detach = udp_detach,
1.208 rtr 1381: .pr_accept = udp_accept,
1.210 rtr 1382: .pr_bind = udp_bind,
1383: .pr_listen = udp_listen,
1.211 rtr 1384: .pr_connect = udp_connect,
1.217 rtr 1385: .pr_connect2 = udp_connect2,
1.212 rtr 1386: .pr_disconnect = udp_disconnect,
1387: .pr_shutdown = udp_shutdown,
1388: .pr_abort = udp_abort,
1.200 rtr 1389: .pr_ioctl = udp_ioctl,
1.203 rtr 1390: .pr_stat = udp_stat,
1.207 rtr 1391: .pr_peeraddr = udp_peeraddr,
1392: .pr_sockaddr = udp_sockaddr,
1.216 rtr 1393: .pr_rcvd = udp_rcvd,
1.209 rtr 1394: .pr_recvoob = udp_recvoob,
1.215 rtr 1395: .pr_send = udp_send,
1.209 rtr 1396: .pr_sendoob = udp_sendoob,
1.217 rtr 1397: .pr_purgeif = udp_purgeif,
1.195 rmind 1398: };
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