Annotation of src/sys/netinet/udp_usrreq.c, Revision 1.199
1.199 ! christos 1: /* $NetBSD: udp_usrreq.c,v 1.198 2014/05/22 22:56:53 rmind 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>
1.199 ! christos 69: __KERNEL_RCSID(0, "$NetBSD: udp_usrreq.c,v 1.198 2014/05/22 22:56:53 rmind Exp $");
1.50 thorpej 70:
1.77 soda 71: #include "opt_inet.h"
1.174 christos 72: #include "opt_compat_netbsd.h"
1.50 thorpej 73: #include "opt_ipsec.h"
1.78 thorpej 74: #include "opt_inet_csum.h"
1.64 ws 75: #include "opt_ipkdb.h"
1.101 martin 76: #include "opt_mbuftrace.h"
1.1 cgd 77:
1.5 mycroft 78: #include <sys/param.h>
79: #include <sys/mbuf.h>
1.192 pooka 80: #include <sys/once.h>
1.5 mycroft 81: #include <sys/protosw.h>
82: #include <sys/socket.h>
83: #include <sys/socketvar.h>
1.27 christos 84: #include <sys/systm.h>
85: #include <sys/proc.h>
1.53 itojun 86: #include <sys/domain.h>
1.27 christos 87: #include <sys/sysctl.h>
1.1 cgd 88:
1.5 mycroft 89: #include <net/if.h>
90: #include <net/route.h>
1.1 cgd 91:
1.5 mycroft 92: #include <netinet/in.h>
93: #include <netinet/in_systm.h>
1.15 cgd 94: #include <netinet/in_var.h>
1.5 mycroft 95: #include <netinet/ip.h>
96: #include <netinet/in_pcb.h>
97: #include <netinet/ip_var.h>
98: #include <netinet/ip_icmp.h>
99: #include <netinet/udp.h>
100: #include <netinet/udp_var.h>
1.166 thorpej 101: #include <netinet/udp_private.h>
1.1 cgd 102:
1.53 itojun 103: #ifdef INET6
104: #include <netinet/ip6.h>
105: #include <netinet/icmp6.h>
106: #include <netinet6/ip6_var.h>
1.167 thorpej 107: #include <netinet6/ip6_private.h>
1.53 itojun 108: #include <netinet6/in6_pcb.h>
109: #include <netinet6/udp6_var.h>
1.168 thorpej 110: #include <netinet6/udp6_private.h>
1.53 itojun 111: #endif
112:
113: #ifndef INET6
114: /* always need ip6.h for IP6_EXTHDR_GET */
115: #include <netinet/ip6.h>
116: #endif
117:
1.190 christos 118: #ifdef IPSEC
1.105 jonathan 119: #include <netipsec/ipsec.h>
1.169 thorpej 120: #include <netipsec/ipsec_var.h>
121: #include <netipsec/ipsec_private.h>
1.147 christos 122: #include <netipsec/esp.h>
1.105 jonathan 123: #ifdef INET6
124: #include <netipsec/ipsec6.h>
125: #endif
1.190 christos 126: #endif /* IPSEC */
1.105 jonathan 127:
1.174 christos 128: #ifdef COMPAT_50
129: #include <compat/sys/socket.h>
130: #endif
131:
1.64 ws 132: #ifdef IPKDB
133: #include <ipkdb/ipkdb.h>
134: #endif
135:
1.8 mycroft 136: int udpcksum = 1;
1.141 yamt 137: int udp_do_loopback_cksum = 0;
1.93 matt 138:
139: struct inpcbtable udbtable;
1.164 thorpej 140:
1.166 thorpej 141: percpu_t *udpstat_percpu;
1.8 mycroft 142:
1.72 itojun 143: #ifdef INET
1.190 christos 144: #ifdef IPSEC
1.144 manu 145: static int udp4_espinudp (struct mbuf **, int, struct sockaddr *,
1.130 manu 146: struct socket *);
1.189 christos 147: #endif
1.119 matt 148: static void udp4_sendup (struct mbuf *, int, struct sockaddr *,
149: struct socket *);
150: static int udp4_realinput (struct sockaddr_in *, struct sockaddr_in *,
1.144 manu 151: struct mbuf **, int);
1.129 yamt 152: static int udp4_input_checksum(struct mbuf *, const struct udphdr *, int, int);
1.72 itojun 153: #endif
154: #ifdef INET
1.119 matt 155: static void udp_notify (struct inpcb *, int);
1.72 itojun 156: #endif
1.7 mycroft 157:
1.26 mycroft 158: #ifndef UDBHASHSIZE
159: #define UDBHASHSIZE 128
160: #endif
161: int udbhashsize = UDBHASHSIZE;
162:
1.196 rmind 163: /*
164: * For send - really max datagram size; for receive - 40 1K datagrams.
165: */
166: static int udp_sendspace = 9216;
167: static int udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in));
168:
1.98 matt 169: #ifdef MBUFTRACE
1.150 dogcow 170: struct mowner udp_mowner = MOWNER_INIT("udp", "");
171: struct mowner udp_rx_mowner = MOWNER_INIT("udp", "rx");
172: struct mowner udp_tx_mowner = MOWNER_INIT("udp", "tx");
1.98 matt 173: #endif
174:
1.78 thorpej 175: #ifdef UDP_CSUM_COUNTERS
176: #include <sys/device.h>
177:
1.140 yamt 178: #if defined(INET)
1.78 thorpej 179: struct evcnt udp_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
180: NULL, "udp", "hwcsum bad");
181: struct evcnt udp_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
182: NULL, "udp", "hwcsum ok");
183: struct evcnt udp_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
184: NULL, "udp", "hwcsum data");
185: struct evcnt udp_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
186: NULL, "udp", "swcsum");
187:
1.120 matt 188: EVCNT_ATTACH_STATIC(udp_hwcsum_bad);
189: EVCNT_ATTACH_STATIC(udp_hwcsum_ok);
190: EVCNT_ATTACH_STATIC(udp_hwcsum_data);
191: EVCNT_ATTACH_STATIC(udp_swcsum);
1.140 yamt 192: #endif /* defined(INET) */
193:
194: #define UDP_CSUM_COUNTER_INCR(ev) (ev)->ev_count++
1.78 thorpej 195: #else
196: #define UDP_CSUM_COUNTER_INCR(ev) /* nothing */
197: #endif /* UDP_CSUM_COUNTERS */
198:
1.179 pooka 199: static void sysctl_net_inet_udp_setup(struct sysctllog **);
200:
1.192 pooka 201: static int
202: do_udpinit(void)
1.1 cgd 203: {
1.18 mycroft 204:
1.35 mycroft 205: in_pcbinit(&udbtable, udbhashsize, udbhashsize);
1.193 pooka 206: udpstat_percpu = percpu_alloc(sizeof(uint64_t) * UDP_NSTATS);
1.78 thorpej 207:
1.98 matt 208: MOWNER_ATTACH(&udp_tx_mowner);
209: MOWNER_ATTACH(&udp_rx_mowner);
210: MOWNER_ATTACH(&udp_mowner);
1.166 thorpej 211:
1.192 pooka 212: return 0;
213: }
214:
215: void
216: udp_init_common(void)
217: {
218: static ONCE_DECL(doudpinit);
219:
220: RUN_ONCE(&doudpinit, do_udpinit);
221: }
222:
223: void
224: udp_init(void)
225: {
226:
227: sysctl_net_inet_udp_setup(NULL);
228:
229: udp_init_common();
1.1 cgd 230: }
231:
1.129 yamt 232: /*
233: * Checksum extended UDP header and data.
234: */
235:
236: int
237: udp_input_checksum(int af, struct mbuf *m, const struct udphdr *uh,
238: int iphlen, int len)
239: {
240:
241: switch (af) {
1.72 itojun 242: #ifdef INET
1.129 yamt 243: case AF_INET:
244: return udp4_input_checksum(m, uh, iphlen, len);
245: #endif
246: #ifdef INET6
247: case AF_INET6:
248: return udp6_input_checksum(m, uh, iphlen, len);
249: #endif
250: }
251: #ifdef DIAGNOSTIC
252: panic("udp_input_checksum: unknown af %d", af);
253: #endif
254: /* NOTREACHED */
255: return -1;
256: }
257:
258: #ifdef INET
259:
260: /*
261: * Checksum extended UDP header and data.
262: */
263:
264: static int
265: udp4_input_checksum(struct mbuf *m, const struct udphdr *uh,
266: int iphlen, int len)
267: {
268:
269: /*
270: * XXX it's better to record and check if this mbuf is
271: * already checked.
272: */
273:
274: if (uh->uh_sum == 0)
275: return 0;
276:
277: switch (m->m_pkthdr.csum_flags &
278: ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv4) |
279: M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) {
280: case M_CSUM_UDPv4|M_CSUM_TCP_UDP_BAD:
281: UDP_CSUM_COUNTER_INCR(&udp_hwcsum_bad);
282: goto badcsum;
283:
284: case M_CSUM_UDPv4|M_CSUM_DATA: {
285: u_int32_t hw_csum = m->m_pkthdr.csum_data;
286:
287: UDP_CSUM_COUNTER_INCR(&udp_hwcsum_data);
288: if (m->m_pkthdr.csum_flags & M_CSUM_NO_PSEUDOHDR) {
289: const struct ip *ip =
290: mtod(m, const struct ip *);
291:
292: hw_csum = in_cksum_phdr(ip->ip_src.s_addr,
293: ip->ip_dst.s_addr,
294: htons(hw_csum + len + IPPROTO_UDP));
295: }
296: if ((hw_csum ^ 0xffff) != 0)
297: goto badcsum;
298: break;
299: }
300:
301: case M_CSUM_UDPv4:
302: /* Checksum was okay. */
303: UDP_CSUM_COUNTER_INCR(&udp_hwcsum_ok);
304: break;
305:
306: default:
307: /*
308: * Need to compute it ourselves. Maybe skip checksum
309: * on loopback interfaces.
310: */
311: if (__predict_true(!(m->m_pkthdr.rcvif->if_flags &
312: IFF_LOOPBACK) ||
313: udp_do_loopback_cksum)) {
314: UDP_CSUM_COUNTER_INCR(&udp_swcsum);
315: if (in4_cksum(m, IPPROTO_UDP, iphlen, len) != 0)
316: goto badcsum;
317: }
318: break;
319: }
320:
321: return 0;
322:
323: badcsum:
1.166 thorpej 324: UDP_STATINC(UDP_STAT_BADSUM);
1.129 yamt 325: return -1;
326: }
327:
1.7 mycroft 328: void
1.27 christos 329: udp_input(struct mbuf *m, ...)
1.1 cgd 330: {
1.53 itojun 331: va_list ap;
332: struct sockaddr_in src, dst;
333: struct ip *ip;
334: struct udphdr *uh;
1.97 simonb 335: int iphlen;
1.53 itojun 336: int len;
337: int n;
1.96 itojun 338: u_int16_t ip_len;
1.53 itojun 339:
340: va_start(ap, m);
341: iphlen = va_arg(ap, int);
1.97 simonb 342: (void)va_arg(ap, int); /* ignore value, advance ap */
1.53 itojun 343: va_end(ap);
344:
1.98 matt 345: MCLAIM(m, &udp_rx_mowner);
1.166 thorpej 346: UDP_STATINC(UDP_STAT_IPACKETS);
1.53 itojun 347:
348: /*
349: * Get IP and UDP header together in first mbuf.
350: */
351: ip = mtod(m, struct ip *);
352: IP6_EXTHDR_GET(uh, struct udphdr *, m, iphlen, sizeof(struct udphdr));
353: if (uh == NULL) {
1.166 thorpej 354: UDP_STATINC(UDP_STAT_HDROPS);
1.53 itojun 355: return;
356: }
1.95 thorpej 357: KASSERT(UDP_HDR_ALIGNED_P(uh));
1.53 itojun 358:
1.57 itojun 359: /* destination port of 0 is illegal, based on RFC768. */
360: if (uh->uh_dport == 0)
361: goto bad;
362:
1.53 itojun 363: /*
364: * Make mbuf data length reflect UDP length.
365: * If not enough data to reflect UDP length, drop.
366: */
1.96 itojun 367: ip_len = ntohs(ip->ip_len);
1.53 itojun 368: len = ntohs((u_int16_t)uh->uh_ulen);
1.96 itojun 369: if (ip_len != iphlen + len) {
370: if (ip_len < iphlen + len || len < sizeof(struct udphdr)) {
1.166 thorpej 371: UDP_STATINC(UDP_STAT_BADLEN);
1.53 itojun 372: goto bad;
373: }
1.96 itojun 374: m_adj(m, iphlen + len - ip_len);
1.53 itojun 375: }
376:
377: /*
378: * Checksum extended UDP header and data.
379: */
1.129 yamt 380: if (udp4_input_checksum(m, uh, iphlen, len))
381: goto badcsum;
1.53 itojun 382:
383: /* construct source and dst sockaddrs. */
1.159 dyoung 384: sockaddr_in_init(&src, &ip->ip_src, uh->uh_sport);
385: sockaddr_in_init(&dst, &ip->ip_dst, uh->uh_dport);
1.53 itojun 386:
1.144 manu 387: if ((n = udp4_realinput(&src, &dst, &m, iphlen)) == -1) {
1.166 thorpej 388: UDP_STATINC(UDP_STAT_HDROPS);
1.144 manu 389: return;
390: }
1.188 christos 391: if (m == NULL) {
392: /*
393: * packet has been processed by ESP stuff -
394: * e.g. dropped NAT-T-keep-alive-packet ...
395: */
396: return;
397: }
398: ip = mtod(m, struct ip *);
1.53 itojun 399: #ifdef INET6
400: if (IN_MULTICAST(ip->ip_dst.s_addr) || n == 0) {
401: struct sockaddr_in6 src6, dst6;
402:
1.175 cegger 403: memset(&src6, 0, sizeof(src6));
1.53 itojun 404: src6.sin6_family = AF_INET6;
405: src6.sin6_len = sizeof(struct sockaddr_in6);
406: src6.sin6_addr.s6_addr[10] = src6.sin6_addr.s6_addr[11] = 0xff;
1.177 tsutsui 407: memcpy(&src6.sin6_addr.s6_addr[12], &ip->ip_src,
1.53 itojun 408: sizeof(ip->ip_src));
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);
413: dst6.sin6_addr.s6_addr[10] = dst6.sin6_addr.s6_addr[11] = 0xff;
1.177 tsutsui 414: memcpy(&dst6.sin6_addr.s6_addr[12], &ip->ip_dst,
1.53 itojun 415: sizeof(ip->ip_dst));
416: dst6.sin6_port = uh->uh_dport;
417:
418: n += udp6_realinput(AF_INET, &src6, &dst6, m, iphlen);
419: }
420: #endif
421:
422: if (n == 0) {
423: if (m->m_flags & (M_BCAST | M_MCAST)) {
1.166 thorpej 424: UDP_STATINC(UDP_STAT_NOPORTBCAST);
1.53 itojun 425: goto bad;
426: }
1.166 thorpej 427: UDP_STATINC(UDP_STAT_NOPORT);
1.64 ws 428: #ifdef IPKDB
1.53 itojun 429: if (checkipkdb(&ip->ip_src, uh->uh_sport, uh->uh_dport,
430: m, iphlen + sizeof(struct udphdr),
431: m->m_pkthdr.len - iphlen - sizeof(struct udphdr))) {
432: /*
433: * It was a debugger connect packet,
434: * just drop it now
435: */
436: goto bad;
437: }
438: #endif
439: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
440: m = NULL;
441: }
442:
443: bad:
444: if (m)
445: m_freem(m);
1.78 thorpej 446: return;
447:
448: badcsum:
449: m_freem(m);
1.53 itojun 450: }
1.72 itojun 451: #endif
1.53 itojun 452:
1.72 itojun 453: #ifdef INET
1.53 itojun 454: static void
1.119 matt 455: udp4_sendup(struct mbuf *m, int off /* offset of data portion */,
456: struct sockaddr *src, struct socket *so)
1.53 itojun 457: {
458: struct mbuf *opts = NULL;
459: struct mbuf *n;
460: struct inpcb *inp = NULL;
461:
462: if (!so)
463: return;
464: switch (so->so_proto->pr_domain->dom_family) {
465: case AF_INET:
466: inp = sotoinpcb(so);
467: break;
468: #ifdef INET6
469: case AF_INET6:
470: break;
471: #endif
472: default:
473: return;
474: }
475:
1.190 christos 476: #if defined(IPSEC)
1.53 itojun 477: /* check AH/ESP integrity. */
1.199 ! christos 478: if (ipsec_used && so != NULL && ipsec4_in_reject_so(m, so)) {
1.169 thorpej 479: IPSEC_STATINC(IPSEC_STAT_IN_POLVIO);
1.162 dyoung 480: if ((n = m_copypacket(m, M_DONTWAIT)) != NULL)
1.110 itojun 481: icmp_error(n, ICMP_UNREACH, ICMP_UNREACH_ADMIN_PROHIBIT,
482: 0, 0);
1.53 itojun 483: return;
484: }
485: #endif /*IPSEC*/
486:
1.162 dyoung 487: if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) {
1.53 itojun 488: if (inp && (inp->inp_flags & INP_CONTROLOPTS
1.174 christos 489: #ifdef SO_OTIMESTAMP
490: || so->so_options & SO_OTIMESTAMP
491: #endif
1.53 itojun 492: || so->so_options & SO_TIMESTAMP)) {
493: struct ip *ip = mtod(n, struct ip *);
494: ip_savecontrol(inp, &opts, ip, n);
495: }
496:
497: m_adj(n, off);
498: if (sbappendaddr(&so->so_rcv, src, n,
499: opts) == 0) {
500: m_freem(n);
501: if (opts)
502: m_freem(opts);
1.124 darrenr 503: so->so_rcv.sb_overflowed++;
1.166 thorpej 504: UDP_STATINC(UDP_STAT_FULLSOCK);
1.53 itojun 505: } else
506: sorwakeup(so);
507: }
508: }
1.72 itojun 509: #endif
1.53 itojun 510:
1.72 itojun 511: #ifdef INET
1.53 itojun 512: static int
1.119 matt 513: udp4_realinput(struct sockaddr_in *src, struct sockaddr_in *dst,
1.144 manu 514: struct mbuf **mp, int off /* offset of udphdr */)
1.53 itojun 515: {
516: u_int16_t *sport, *dport;
517: int rcvcnt;
518: struct in_addr *src4, *dst4;
1.109 itojun 519: struct inpcb_hdr *inph;
1.53 itojun 520: struct inpcb *inp;
1.144 manu 521: struct mbuf *m = *mp;
1.53 itojun 522:
523: rcvcnt = 0;
524: off += sizeof(struct udphdr); /* now, offset of payload */
525:
526: if (src->sin_family != AF_INET || dst->sin_family != AF_INET)
527: goto bad;
528:
529: src4 = &src->sin_addr;
530: sport = &src->sin_port;
531: dst4 = &dst->sin_addr;
532: dport = &dst->sin_port;
533:
1.73 itojun 534: if (IN_MULTICAST(dst4->s_addr) ||
1.53 itojun 535: in_broadcast(*dst4, m->m_pkthdr.rcvif)) {
536: /*
537: * Deliver a multicast or broadcast datagram to *all* sockets
538: * for which the local and remote addresses and ports match
539: * those of the incoming datagram. This allows more than
540: * one process to receive multi/broadcasts on the same port.
541: * (This really ought to be done for unicast datagrams as
542: * well, but that would cause problems with existing
543: * applications that open both address-specific sockets and
544: * a wildcard socket listening to the same port -- they would
545: * end up receiving duplicates of every unicast datagram.
546: * Those applications open the multiple sockets to overcome an
547: * inadequacy of the UDP socket interface, but for backwards
548: * compatibility we avoid the problem here rather than
549: * fixing the interface. Maybe 4.5BSD will remedy this?)
550: */
551:
552: /*
1.92 itojun 553: * KAME note: traditionally we dropped udpiphdr from mbuf here.
1.71 itojun 554: * we need udpiphdr for IPsec processing so we do that later.
1.53 itojun 555: */
556: /*
557: * Locate pcb(s) for datagram.
558: */
1.191 christos 559: TAILQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) {
1.109 itojun 560: inp = (struct inpcb *)inph;
561: if (inp->inp_af != AF_INET)
562: continue;
563:
1.53 itojun 564: if (inp->inp_lport != *dport)
565: continue;
566: if (!in_nullhost(inp->inp_laddr)) {
567: if (!in_hosteq(inp->inp_laddr, *dst4))
568: continue;
569: }
570: if (!in_nullhost(inp->inp_faddr)) {
571: if (!in_hosteq(inp->inp_faddr, *src4) ||
572: inp->inp_fport != *sport)
573: continue;
574: }
575:
576: udp4_sendup(m, off, (struct sockaddr *)src,
577: inp->inp_socket);
578: rcvcnt++;
579:
580: /*
581: * Don't look for additional matches if this one does
582: * not have either the SO_REUSEPORT or SO_REUSEADDR
583: * socket options set. This heuristic avoids searching
584: * through all pcbs in the common case of a non-shared
585: * port. It assumes that an application will never
586: * clear these options after setting them.
587: */
588: if ((inp->inp_socket->so_options &
589: (SO_REUSEPORT|SO_REUSEADDR)) == 0)
590: break;
591: }
592: } else {
593: /*
594: * Locate pcb for datagram.
595: */
1.180 dyoung 596: inp = in_pcblookup_connect(&udbtable, *src4, *sport, *dst4,
597: *dport, 0);
1.53 itojun 598: if (inp == 0) {
1.166 thorpej 599: UDP_STATINC(UDP_STAT_PCBHASHMISS);
1.53 itojun 600: inp = in_pcblookup_bind(&udbtable, *dst4, *dport);
1.82 itojun 601: if (inp == 0)
1.53 itojun 602: return rcvcnt;
603: }
604:
1.190 christos 605: #ifdef IPSEC
1.130 manu 606: /* Handle ESP over UDP */
607: if (inp->inp_flags & INP_ESPINUDP_ALL) {
608: struct sockaddr *sa = (struct sockaddr *)src;
609:
1.144 manu 610: switch(udp4_espinudp(mp, off, sa, inp->inp_socket)) {
611: case -1: /* Error, m was freeed */
612: rcvcnt = -1;
613: goto bad;
614: break;
615:
616: case 1: /* ESP over UDP */
1.130 manu 617: rcvcnt++;
618: goto bad;
1.144 manu 619: break;
620:
621: case 0: /* plain UDP */
622: default: /* Unexpected */
623: /*
624: * Normal UDP processing will take place
625: * m may have changed.
626: */
627: m = *mp;
628: break;
1.130 manu 629: }
630: }
1.189 christos 631: #endif
1.130 manu 632:
1.178 minskim 633: /*
634: * Check the minimum TTL for socket.
635: */
636: if (mtod(m, struct ip *)->ip_ttl < inp->inp_ip_minttl)
637: goto bad;
638:
1.53 itojun 639: udp4_sendup(m, off, (struct sockaddr *)src, inp->inp_socket);
640: rcvcnt++;
641: }
642:
643: bad:
644: return rcvcnt;
645: }
1.72 itojun 646: #endif
1.53 itojun 647:
1.72 itojun 648: #ifdef INET
1.1 cgd 649: /*
650: * Notify a udp user of an asynchronous error;
651: * just wake up so that he can collect error status.
652: */
1.7 mycroft 653: static void
1.119 matt 654: udp_notify(struct inpcb *inp, int errno)
1.1 cgd 655: {
656: inp->inp_socket->so_error = errno;
657: sorwakeup(inp->inp_socket);
658: sowwakeup(inp->inp_socket);
659: }
660:
1.27 christos 661: void *
1.157 dyoung 662: udp_ctlinput(int cmd, const struct sockaddr *sa, void *v)
1.1 cgd 663: {
1.66 augustss 664: struct ip *ip = v;
665: struct udphdr *uh;
1.119 matt 666: void (*notify)(struct inpcb *, int) = udp_notify;
1.21 mycroft 667: int errno;
1.1 cgd 668:
1.53 itojun 669: if (sa->sa_family != AF_INET
670: || sa->sa_len != sizeof(struct sockaddr_in))
1.51 itojun 671: return NULL;
1.20 mycroft 672: if ((unsigned)cmd >= PRC_NCMDS)
1.27 christos 673: return NULL;
1.20 mycroft 674: errno = inetctlerrmap[cmd];
1.18 mycroft 675: if (PRC_IS_REDIRECT(cmd))
1.19 mycroft 676: notify = in_rtchange, ip = 0;
1.18 mycroft 677: else if (cmd == PRC_HOSTDEAD)
1.19 mycroft 678: ip = 0;
1.23 cgd 679: else if (errno == 0)
1.27 christos 680: return NULL;
1.19 mycroft 681: if (ip) {
1.158 christos 682: uh = (struct udphdr *)((char *)ip + (ip->ip_hl << 2));
1.157 dyoung 683: in_pcbnotify(&udbtable, satocsin(sa)->sin_addr, uh->uh_dport,
1.34 mycroft 684: ip->ip_src, uh->uh_sport, errno, notify);
1.53 itojun 685:
686: /* XXX mapped address case */
1.19 mycroft 687: } else
1.157 dyoung 688: in_pcbnotifyall(&udbtable, satocsin(sa)->sin_addr, errno,
1.34 mycroft 689: notify);
1.27 christos 690: return NULL;
1.1 cgd 691: }
692:
1.7 mycroft 693: int
1.173 plunky 694: udp_ctloutput(int op, struct socket *so, struct sockopt *sopt)
1.130 manu 695: {
696: int s;
697: int error = 0;
698: struct inpcb *inp;
699: int family;
1.173 plunky 700: int optval;
1.130 manu 701:
702: family = so->so_proto->pr_domain->dom_family;
703:
704: s = splsoftnet();
705: switch (family) {
706: #ifdef INET
707: case PF_INET:
1.173 plunky 708: if (sopt->sopt_level != IPPROTO_UDP) {
709: error = ip_ctloutput(op, so, sopt);
1.130 manu 710: goto end;
711: }
712: break;
713: #endif
714: #ifdef INET6
715: case PF_INET6:
1.173 plunky 716: if (sopt->sopt_level != IPPROTO_UDP) {
717: error = ip6_ctloutput(op, so, sopt);
1.130 manu 718: goto end;
719: }
720: break;
721: #endif
722: default:
723: error = EAFNOSUPPORT;
724: goto end;
725: }
726:
727:
728: switch (op) {
729: case PRCO_SETOPT:
730: inp = sotoinpcb(so);
731:
1.173 plunky 732: switch (sopt->sopt_name) {
1.130 manu 733: case UDP_ENCAP:
1.173 plunky 734: error = sockopt_getint(sopt, &optval);
735: if (error)
1.153 yamt 736: break;
1.131 perry 737:
1.173 plunky 738: switch(optval) {
1.130 manu 739: case 0:
740: inp->inp_flags &= ~INP_ESPINUDP_ALL;
741: break;
742:
743: case UDP_ENCAP_ESPINUDP:
744: inp->inp_flags &= ~INP_ESPINUDP_ALL;
745: inp->inp_flags |= INP_ESPINUDP;
746: break;
1.131 perry 747:
1.130 manu 748: case UDP_ENCAP_ESPINUDP_NON_IKE:
749: inp->inp_flags &= ~INP_ESPINUDP_ALL;
750: inp->inp_flags |= INP_ESPINUDP_NON_IKE;
751: break;
752: default:
753: error = EINVAL;
754: break;
755: }
756: break;
1.183 christos 757:
1.130 manu 758: default:
759: error = ENOPROTOOPT;
760: break;
761: }
762: break;
763:
764: default:
765: error = EINVAL;
766: break;
1.131 perry 767: }
768:
1.130 manu 769: end:
770: splx(s);
771: return error;
772: }
1.131 perry 773:
1.130 manu 774:
775: int
1.27 christos 776: udp_output(struct mbuf *m, ...)
777: {
1.66 augustss 778: struct inpcb *inp;
779: struct udpiphdr *ui;
1.125 thorpej 780: struct route *ro;
1.66 augustss 781: int len = m->m_pkthdr.len;
1.31 mycroft 782: int error = 0;
1.27 christos 783: va_list ap;
784:
1.98 matt 785: MCLAIM(m, &udp_tx_mowner);
1.27 christos 786: va_start(ap, m);
787: inp = va_arg(ap, struct inpcb *);
788: va_end(ap);
1.1 cgd 789:
790: /*
791: * Calculate data length and get a mbuf
792: * for UDP and IP headers.
793: */
1.13 mycroft 794: M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT);
795: if (m == 0) {
796: error = ENOBUFS;
1.39 thorpej 797: goto release;
798: }
799:
800: /*
801: * Compute the packet length of the IP header, and
802: * punt if the length looks bogus.
803: */
1.96 itojun 804: if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) {
1.39 thorpej 805: error = EMSGSIZE;
1.13 mycroft 806: goto release;
807: }
1.1 cgd 808:
809: /*
810: * Fill in mbuf with extended UDP header
811: * and addresses and length put into network format.
812: */
813: ui = mtod(m, struct udpiphdr *);
814: ui->ui_pr = IPPROTO_UDP;
815: ui->ui_src = inp->inp_laddr;
816: ui->ui_dst = inp->inp_faddr;
817: ui->ui_sport = inp->inp_lport;
818: ui->ui_dport = inp->inp_fport;
1.78 thorpej 819: ui->ui_ulen = htons((u_int16_t)len + sizeof(struct udphdr));
1.1 cgd 820:
1.125 thorpej 821: ro = &inp->inp_route;
822:
1.1 cgd 823: /*
1.78 thorpej 824: * Set up checksum and output datagram.
1.1 cgd 825: */
826: if (udpcksum) {
1.78 thorpej 827: /*
828: * XXX Cache pseudo-header checksum part for
829: * XXX "connected" UDP sockets.
830: */
831: ui->ui_sum = in_cksum_phdr(ui->ui_src.s_addr,
832: ui->ui_dst.s_addr, htons((u_int16_t)len +
833: sizeof(struct udphdr) + IPPROTO_UDP));
1.135 yamt 834: m->m_pkthdr.csum_flags = M_CSUM_UDPv4;
1.78 thorpej 835: m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
836: } else
837: ui->ui_sum = 0;
1.96 itojun 838: ((struct ip *)ui)->ip_len = htons(sizeof (struct udpiphdr) + len);
1.1 cgd 839: ((struct ip *)ui)->ip_ttl = inp->inp_ip.ip_ttl; /* XXX */
840: ((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; /* XXX */
1.166 thorpej 841: UDP_STATINC(UDP_STAT_OPACKETS);
1.48 itojun 842:
1.125 thorpej 843: return (ip_output(m, inp->inp_options, ro,
1.12 mycroft 844: inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST),
1.107 itojun 845: inp->inp_moptions, inp->inp_socket));
1.1 cgd 846:
847: release:
848: m_freem(m);
849: return (error);
850: }
851:
1.196 rmind 852: static int
853: udp_attach(struct socket *so, int proto)
854: {
855: struct inpcb *inp;
856: int error;
857:
858: KASSERT(sotoinpcb(so) == NULL);
859:
860: /* Assign the lock (must happen even if we will error out). */
861: sosetlock(so);
862:
863: #ifdef MBUFTRACE
864: so->so_mowner = &udp_mowner;
865: so->so_rcv.sb_mowner = &udp_rx_mowner;
866: so->so_snd.sb_mowner = &udp_tx_mowner;
867: #endif
868: if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
869: error = soreserve(so, udp_sendspace, udp_recvspace);
870: if (error) {
871: return error;
872: }
873: }
874:
875: error = in_pcballoc(so, &udbtable);
876: if (error) {
877: return error;
878: }
879: inp = sotoinpcb(so);
880: inp->inp_ip.ip_ttl = ip_defttl;
881: KASSERT(solocked(so));
882:
883: return error;
884: }
885:
886: static void
887: udp_detach(struct socket *so)
888: {
889: struct inpcb *inp;
890:
891: KASSERT(solocked(so));
892: inp = sotoinpcb(so);
893: KASSERT(inp != NULL);
894: in_pcbdetach(inp);
895: }
1.1 cgd 896:
1.195 rmind 897: static int
1.119 matt 898: udp_usrreq(struct socket *so, int req, struct mbuf *m, struct mbuf *nam,
1.195 rmind 899: struct mbuf *control, struct lwp *l)
1.1 cgd 900: {
1.66 augustss 901: struct inpcb *inp;
1.196 rmind 902: int s, error = 0;
1.1 cgd 903:
1.196 rmind 904: KASSERT(req != PRU_ATTACH);
905: KASSERT(req != PRU_DETACH);
1.59 thorpej 906:
1.196 rmind 907: if (req == PRU_CONTROL) {
908: return in_control(so, (long)m, (void *)nam,
909: (struct ifnet *)control, l);
910: }
1.149 tls 911: s = splsoftnet();
1.60 thorpej 912: if (req == PRU_PURGEIF) {
1.170 ad 913: mutex_enter(softnet_lock);
1.80 itojun 914: in_pcbpurgeif0(&udbtable, (struct ifnet *)control);
1.60 thorpej 915: in_purgeif((struct ifnet *)control);
916: in_pcbpurgeif(&udbtable, (struct ifnet *)control);
1.170 ad 917: mutex_exit(softnet_lock);
1.149 tls 918: splx(s);
1.196 rmind 919: return 0;
1.59 thorpej 920: }
1.31 mycroft 921:
1.196 rmind 922: KASSERT(solocked(so));
1.31 mycroft 923: inp = sotoinpcb(so);
1.196 rmind 924:
925: KASSERT(!control || (req == PRU_SEND || req == PRU_SENDOOB));
926: if (inp == NULL) {
927: splx(s);
928: return EINVAL;
1.31 mycroft 929: }
930:
1.1 cgd 931: /*
932: * Note: need to block udp_input while changing
933: * the udp pcb queue and/or pcb addresses.
934: */
935: switch (req) {
936: case PRU_BIND:
1.148 ad 937: error = in_pcbbind(inp, nam, l);
1.1 cgd 938: break;
939:
940: case PRU_LISTEN:
941: error = EOPNOTSUPP;
942: break;
943:
944: case PRU_CONNECT:
1.148 ad 945: error = in_pcbconnect(inp, nam, l);
1.31 mycroft 946: if (error)
1.1 cgd 947: break;
1.31 mycroft 948: soisconnected(so);
1.1 cgd 949: break;
950:
951: case PRU_CONNECT2:
952: error = EOPNOTSUPP;
953: break;
954:
955: case PRU_DISCONNECT:
1.31 mycroft 956: /*soisdisconnected(so);*/
957: so->so_state &= ~SS_ISCONNECTED; /* XXX */
1.1 cgd 958: in_pcbdisconnect(inp);
1.34 mycroft 959: inp->inp_laddr = zeroin_addr; /* XXX */
1.35 mycroft 960: in_pcbstate(inp, INP_BOUND); /* XXX */
1.1 cgd 961: break;
962:
963: case PRU_SHUTDOWN:
964: socantsendmore(so);
965: break;
966:
1.31 mycroft 967: case PRU_RCVD:
968: error = EOPNOTSUPP;
1.1 cgd 969: break;
970:
1.31 mycroft 971: case PRU_SEND:
1.32 mycroft 972: if (control && control->m_len) {
973: m_freem(control);
974: m_freem(m);
975: error = EINVAL;
976: break;
977: }
1.31 mycroft 978: {
1.35 mycroft 979: struct in_addr laddr; /* XXX */
1.1 cgd 980:
1.181 mrg 981: memset(&laddr, 0, sizeof laddr);
1.31 mycroft 982: if (nam) {
1.35 mycroft 983: laddr = inp->inp_laddr; /* XXX */
1.31 mycroft 984: if ((so->so_state & SS_ISCONNECTED) != 0) {
985: error = EISCONN;
1.32 mycroft 986: goto die;
1.31 mycroft 987: }
1.148 ad 988: error = in_pcbconnect(inp, nam, l);
1.100 matt 989: if (error)
990: goto die;
1.31 mycroft 991: } else {
992: if ((so->so_state & SS_ISCONNECTED) == 0) {
993: error = ENOTCONN;
1.32 mycroft 994: goto die;
1.31 mycroft 995: }
996: }
1.33 mycroft 997: error = udp_output(m, inp);
1.100 matt 998: m = NULL;
1.31 mycroft 999: if (nam) {
1000: in_pcbdisconnect(inp);
1.35 mycroft 1001: inp->inp_laddr = laddr; /* XXX */
1002: in_pcbstate(inp, INP_BOUND); /* XXX */
1.31 mycroft 1003: }
1.100 matt 1004: die:
1005: if (m)
1006: m_freem(m);
1.31 mycroft 1007: }
1.1 cgd 1008: break;
1009:
1010: case PRU_SENSE:
1011: /*
1012: * stat: don't bother with a blocksize.
1013: */
1.31 mycroft 1014: splx(s);
1.1 cgd 1015: return (0);
1016:
1.31 mycroft 1017: case PRU_RCVOOB:
1018: error = EOPNOTSUPP;
1019: break;
1020:
1.1 cgd 1021: case PRU_SENDOOB:
1.32 mycroft 1022: m_freem(control);
1.31 mycroft 1023: m_freem(m);
1.1 cgd 1024: error = EOPNOTSUPP;
1025: break;
1026:
1.31 mycroft 1027: case PRU_SOCKADDR:
1028: in_setsockaddr(inp, nam);
1029: break;
1030:
1031: case PRU_PEERADDR:
1032: in_setpeeraddr(inp, nam);
1033: break;
1.1 cgd 1034:
1035: default:
1036: panic("udp_usrreq");
1037: }
1.196 rmind 1038: splx(s);
1.1 cgd 1039:
1.196 rmind 1040: return error;
1.13 mycroft 1041: }
1042:
1.166 thorpej 1043: static int
1044: sysctl_net_inet_udp_stats(SYSCTLFN_ARGS)
1045: {
1046:
1.172 thorpej 1047: return (NETSTAT_SYSCTL(udpstat_percpu, UDP_NSTATS));
1.166 thorpej 1048: }
1049:
1.13 mycroft 1050: /*
1051: * Sysctl for udp variables.
1052: */
1.179 pooka 1053: static void
1054: sysctl_net_inet_udp_setup(struct sysctllog **clog)
1.13 mycroft 1055: {
1.194 pooka 1056:
1.116 atatat 1057: sysctl_createv(clog, 0, NULL, NULL,
1058: CTLFLAG_PERMANENT,
1.114 atatat 1059: CTLTYPE_NODE, "inet", NULL,
1060: NULL, 0, NULL, 0,
1061: CTL_NET, PF_INET, CTL_EOL);
1.116 atatat 1062: sysctl_createv(clog, 0, NULL, NULL,
1063: CTLFLAG_PERMANENT,
1.122 atatat 1064: CTLTYPE_NODE, "udp",
1065: SYSCTL_DESCR("UDPv4 related settings"),
1.114 atatat 1066: NULL, 0, NULL, 0,
1067: CTL_NET, PF_INET, IPPROTO_UDP, CTL_EOL);
1068:
1.116 atatat 1069: sysctl_createv(clog, 0, NULL, NULL,
1070: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122 atatat 1071: CTLTYPE_INT, "checksum",
1.123 heas 1072: SYSCTL_DESCR("Compute UDP checksums"),
1.114 atatat 1073: NULL, 0, &udpcksum, 0,
1074: CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_CHECKSUM,
1075: CTL_EOL);
1.116 atatat 1076: sysctl_createv(clog, 0, NULL, NULL,
1077: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122 atatat 1078: CTLTYPE_INT, "sendspace",
1079: SYSCTL_DESCR("Default UDP send buffer size"),
1.114 atatat 1080: NULL, 0, &udp_sendspace, 0,
1081: CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_SENDSPACE,
1082: CTL_EOL);
1.116 atatat 1083: sysctl_createv(clog, 0, NULL, NULL,
1084: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122 atatat 1085: CTLTYPE_INT, "recvspace",
1086: SYSCTL_DESCR("Default UDP receive buffer size"),
1.114 atatat 1087: NULL, 0, &udp_recvspace, 0,
1088: CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_RECVSPACE,
1089: CTL_EOL);
1.125 thorpej 1090: sysctl_createv(clog, 0, NULL, NULL,
1091: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1092: CTLTYPE_INT, "do_loopback_cksum",
1093: SYSCTL_DESCR("Perform UDP checksum on loopback"),
1094: NULL, 0, &udp_do_loopback_cksum, 0,
1095: CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_LOOPBACKCKSUM,
1096: CTL_EOL);
1.132 atatat 1097: sysctl_createv(clog, 0, NULL, NULL,
1098: CTLFLAG_PERMANENT,
1.134 atatat 1099: CTLTYPE_STRUCT, "pcblist",
1.132 atatat 1100: SYSCTL_DESCR("UDP protocol control block list"),
1101: sysctl_inpcblist, 0, &udbtable, 0,
1102: CTL_NET, PF_INET, IPPROTO_UDP, CTL_CREATE,
1103: CTL_EOL);
1.139 elad 1104: sysctl_createv(clog, 0, NULL, NULL,
1105: CTLFLAG_PERMANENT,
1106: CTLTYPE_STRUCT, "stats",
1107: SYSCTL_DESCR("UDP statistics"),
1.166 thorpej 1108: sysctl_net_inet_udp_stats, 0, NULL, 0,
1.139 elad 1109: CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_STATS,
1110: CTL_EOL);
1.1 cgd 1111: }
1.72 itojun 1112: #endif
1.130 manu 1113:
1.166 thorpej 1114: void
1115: udp_statinc(u_int stat)
1116: {
1117:
1118: KASSERT(stat < UDP_NSTATS);
1119: UDP_STATINC(stat);
1120: }
1121:
1.190 christos 1122: #if defined(INET) && defined(IPSEC)
1.130 manu 1123: /*
1124: * Returns:
1125: * 1 if the packet was processed
1126: * 0 if normal UDP processing should take place
1.144 manu 1127: * -1 if an error occurent and m was freed
1.130 manu 1128: */
1129: static int
1.154 yamt 1130: udp4_espinudp(struct mbuf **mp, int off, struct sockaddr *src,
1.151 christos 1131: struct socket *so)
1.130 manu 1132: {
1133: size_t len;
1.158 christos 1134: void *data;
1.130 manu 1135: struct inpcb *inp;
1136: size_t skip = 0;
1137: size_t minlen;
1138: size_t iphdrlen;
1139: struct ip *ip;
1.136 manu 1140: struct m_tag *tag;
1141: struct udphdr *udphdr;
1142: u_int16_t sport, dport;
1.144 manu 1143: struct mbuf *m = *mp;
1.130 manu 1144:
1.131 perry 1145: /*
1.130 manu 1146: * Collapse the mbuf chain if the first mbuf is too short
1147: * The longest case is: UDP + non ESP marker + ESP
1148: */
1149: minlen = off + sizeof(u_int64_t) + sizeof(struct esp);
1150: if (minlen > m->m_pkthdr.len)
1151: minlen = m->m_pkthdr.len;
1152:
1153: if (m->m_len < minlen) {
1.144 manu 1154: if ((*mp = m_pullup(m, minlen)) == NULL) {
1.130 manu 1155: printf("udp4_espinudp: m_pullup failed\n");
1.144 manu 1156: return -1;
1.130 manu 1157: }
1.144 manu 1158: m = *mp;
1.130 manu 1159: }
1160:
1.131 perry 1161: len = m->m_len - off;
1.158 christos 1162: data = mtod(m, char *) + off;
1.130 manu 1163: inp = sotoinpcb(so);
1164:
1165: /* Ignore keepalive packets */
1.158 christos 1166: if ((len == 1) && (*(unsigned char *)data == 0xff)) {
1.188 christos 1167: m_free(m);
1168: *mp = NULL; /* avoid any further processiong by caller ... */
1.130 manu 1169: return 1;
1170: }
1171:
1.131 perry 1172: /*
1173: * Check that the payload is long enough to hold
1.130 manu 1174: * an ESP header and compute the length of encapsulation
1.131 perry 1175: * header to remove
1.130 manu 1176: */
1177: if (inp->inp_flags & INP_ESPINUDP) {
1178: u_int32_t *st = (u_int32_t *)data;
1179:
1180: if ((len <= sizeof(struct esp)) || (*st == 0))
1181: return 0; /* Normal UDP processing */
1182:
1183: skip = sizeof(struct udphdr);
1184: }
1185:
1186: if (inp->inp_flags & INP_ESPINUDP_NON_IKE) {
1.142 kleink 1187: u_int32_t *st = (u_int32_t *)data;
1.130 manu 1188:
1189: if ((len <= sizeof(u_int64_t) + sizeof(struct esp))
1.142 kleink 1190: || ((st[0] | st[1]) != 0))
1.130 manu 1191: return 0; /* Normal UDP processing */
1.131 perry 1192:
1.130 manu 1193: skip = sizeof(struct udphdr) + sizeof(u_int64_t);
1194: }
1195:
1196: /*
1.136 manu 1197: * Get the UDP ports. They are handled in network
1198: * order everywhere in IPSEC_NAT_T code.
1199: */
1.158 christos 1200: udphdr = (struct udphdr *)((char *)data - skip);
1.136 manu 1201: sport = udphdr->uh_sport;
1202: dport = udphdr->uh_dport;
1203:
1204: /*
1.130 manu 1205: * Remove the UDP header (and possibly the non ESP marker)
1206: * IP header lendth is iphdrlen
1.131 perry 1207: * Before:
1.130 manu 1208: * <--- off --->
1209: * +----+------+-----+
1210: * | IP | UDP | ESP |
1211: * +----+------+-----+
1212: * <-skip->
1213: * After:
1214: * +----+-----+
1215: * | IP | ESP |
1216: * +----+-----+
1217: * <-skip->
1218: */
1219: iphdrlen = off - sizeof(struct udphdr);
1.158 christos 1220: memmove(mtod(m, char *) + skip, mtod(m, void *), iphdrlen);
1.130 manu 1221: m_adj(m, skip);
1222:
1223: ip = mtod(m, struct ip *);
1224: ip->ip_len = htons(ntohs(ip->ip_len) - skip);
1225: ip->ip_p = IPPROTO_ESP;
1226:
1227: /*
1.188 christos 1228: * We have modified the packet - it is now ESP, so we should not
1229: * return to UDP processing ...
1230: *
1.136 manu 1231: * Add a PACKET_TAG_IPSEC_NAT_T_PORT tag to remember
1232: * the source UDP port. This is required if we want
1233: * to select the right SPD for multiple hosts behind
1234: * same NAT
1235: */
1.137 manu 1236: if ((tag = m_tag_get(PACKET_TAG_IPSEC_NAT_T_PORTS,
1237: sizeof(sport) + sizeof(dport), M_DONTWAIT)) == NULL) {
1238: printf("udp4_espinudp: m_tag_get failed\n");
1.188 christos 1239: m_freem(m);
1240: return -1;
1.137 manu 1241: }
1.136 manu 1242: ((u_int16_t *)(tag + 1))[0] = sport;
1243: ((u_int16_t *)(tag + 1))[1] = dport;
1.188 christos 1244: m_tag_prepend(m, tag);
1.136 manu 1245:
1.190 christos 1246: #ifdef IPSEC
1.199 ! christos 1247: if (ipsec_used)
! 1248: ipsec4_common_input(m, iphdrlen, IPPROTO_ESP);
! 1249: /* XXX: else */
1.147 christos 1250: #else
1.188 christos 1251: esp4_input(m, iphdrlen);
1.147 christos 1252: #endif
1.130 manu 1253:
1.185 liamjfoy 1254: /* We handled it, it shouldn't be handled by UDP */
1.188 christos 1255: *mp = NULL; /* avoid free by caller ... */
1.130 manu 1256: return 1;
1257: }
1258: #endif
1.195 rmind 1259:
1.197 rmind 1260: PR_WRAP_USRREQS(udp)
1261: #define udp_attach udp_attach_wrapper
1262: #define udp_detach udp_detach_wrapper
1.195 rmind 1263: #define udp_usrreq udp_usrreq_wrapper
1264:
1265: const struct pr_usrreqs udp_usrreqs = {
1.196 rmind 1266: .pr_attach = udp_attach,
1267: .pr_detach = udp_detach,
1.195 rmind 1268: .pr_generic = udp_usrreq,
1269: };
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