Annotation of src/sys/netinet/udp_usrreq.c, Revision 1.194
1.194 ! pooka 1: /* $NetBSD: udp_usrreq.c,v 1.193 2014/01/04 14:18:12 pooka 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>
1.194 ! pooka 64: __KERNEL_RCSID(0, "$NetBSD: udp_usrreq.c,v 1.193 2014/01/04 14:18:12 pooka Exp $");
1.50 thorpej 65:
1.77 soda 66: #include "opt_inet.h"
1.174 christos 67: #include "opt_compat_netbsd.h"
1.50 thorpej 68: #include "opt_ipsec.h"
1.78 thorpej 69: #include "opt_inet_csum.h"
1.64 ws 70: #include "opt_ipkdb.h"
1.101 martin 71: #include "opt_mbuftrace.h"
1.1 cgd 72:
1.5 mycroft 73: #include <sys/param.h>
74: #include <sys/malloc.h>
75: #include <sys/mbuf.h>
1.192 pooka 76: #include <sys/once.h>
1.5 mycroft 77: #include <sys/protosw.h>
78: #include <sys/socket.h>
79: #include <sys/socketvar.h>
1.13 mycroft 80: #include <sys/errno.h>
1.5 mycroft 81: #include <sys/stat.h>
1.27 christos 82: #include <sys/systm.h>
83: #include <sys/proc.h>
1.53 itojun 84: #include <sys/domain.h>
1.27 christos 85: #include <sys/sysctl.h>
1.1 cgd 86:
1.5 mycroft 87: #include <net/if.h>
88: #include <net/route.h>
1.1 cgd 89:
1.5 mycroft 90: #include <netinet/in.h>
91: #include <netinet/in_systm.h>
1.15 cgd 92: #include <netinet/in_var.h>
1.5 mycroft 93: #include <netinet/ip.h>
94: #include <netinet/in_pcb.h>
95: #include <netinet/ip_var.h>
96: #include <netinet/ip_icmp.h>
97: #include <netinet/udp.h>
98: #include <netinet/udp_var.h>
1.166 thorpej 99: #include <netinet/udp_private.h>
1.1 cgd 100:
1.53 itojun 101: #ifdef INET6
102: #include <netinet/ip6.h>
103: #include <netinet/icmp6.h>
104: #include <netinet6/ip6_var.h>
1.167 thorpej 105: #include <netinet6/ip6_private.h>
1.53 itojun 106: #include <netinet6/in6_pcb.h>
107: #include <netinet6/udp6_var.h>
1.168 thorpej 108: #include <netinet6/udp6_private.h>
1.146 rpaulo 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:
1.190 christos 122: #ifdef IPSEC
1.105 jonathan 123: #include <netipsec/ipsec.h>
1.169 thorpej 124: #include <netipsec/ipsec_var.h>
125: #include <netipsec/ipsec_private.h>
1.147 christos 126: #include <netipsec/esp.h>
1.105 jonathan 127: #ifdef INET6
128: #include <netipsec/ipsec6.h>
129: #endif
1.190 christos 130: #endif /* IPSEC */
1.105 jonathan 131:
1.174 christos 132: #ifdef COMPAT_50
133: #include <compat/sys/socket.h>
134: #endif
135:
1.64 ws 136: #ifdef IPKDB
137: #include <ipkdb/ipkdb.h>
138: #endif
139:
1.8 mycroft 140: /*
141: * UDP protocol implementation.
142: * Per RFC 768, August, 1980.
143: */
144: int udpcksum = 1;
1.141 yamt 145: int udp_do_loopback_cksum = 0;
1.93 matt 146:
147: struct inpcbtable udbtable;
1.164 thorpej 148:
1.166 thorpej 149: percpu_t *udpstat_percpu;
1.8 mycroft 150:
1.72 itojun 151: #ifdef INET
1.190 christos 152: #ifdef IPSEC
1.144 manu 153: static int udp4_espinudp (struct mbuf **, int, struct sockaddr *,
1.130 manu 154: struct socket *);
1.189 christos 155: #endif
1.119 matt 156: static void udp4_sendup (struct mbuf *, int, struct sockaddr *,
157: struct socket *);
158: static int udp4_realinput (struct sockaddr_in *, struct sockaddr_in *,
1.144 manu 159: struct mbuf **, int);
1.129 yamt 160: static int udp4_input_checksum(struct mbuf *, const struct udphdr *, int, int);
1.72 itojun 161: #endif
1.53 itojun 162: #ifdef INET6
1.119 matt 163: static void udp6_sendup (struct mbuf *, int, struct sockaddr *,
164: struct socket *);
165: static int udp6_realinput (int, struct sockaddr_in6 *,
166: struct sockaddr_in6 *, struct mbuf *, int);
1.129 yamt 167: static int udp6_input_checksum(struct mbuf *, const struct udphdr *, int, int);
1.53 itojun 168: #endif
1.72 itojun 169: #ifdef INET
1.119 matt 170: static void udp_notify (struct inpcb *, int);
1.72 itojun 171: #endif
1.7 mycroft 172:
1.26 mycroft 173: #ifndef UDBHASHSIZE
174: #define UDBHASHSIZE 128
175: #endif
176: int udbhashsize = UDBHASHSIZE;
177:
1.98 matt 178: #ifdef MBUFTRACE
1.150 dogcow 179: struct mowner udp_mowner = MOWNER_INIT("udp", "");
180: struct mowner udp_rx_mowner = MOWNER_INIT("udp", "rx");
181: struct mowner udp_tx_mowner = MOWNER_INIT("udp", "tx");
1.98 matt 182: #endif
183:
1.78 thorpej 184: #ifdef UDP_CSUM_COUNTERS
185: #include <sys/device.h>
186:
1.140 yamt 187: #if defined(INET)
1.78 thorpej 188: struct evcnt udp_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
189: NULL, "udp", "hwcsum bad");
190: struct evcnt udp_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
191: NULL, "udp", "hwcsum ok");
192: struct evcnt udp_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
193: NULL, "udp", "hwcsum data");
194: struct evcnt udp_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
195: NULL, "udp", "swcsum");
196:
1.120 matt 197: EVCNT_ATTACH_STATIC(udp_hwcsum_bad);
198: EVCNT_ATTACH_STATIC(udp_hwcsum_ok);
199: EVCNT_ATTACH_STATIC(udp_hwcsum_data);
200: EVCNT_ATTACH_STATIC(udp_swcsum);
1.140 yamt 201: #endif /* defined(INET) */
202:
203: #if defined(INET6)
204: struct evcnt udp6_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
205: NULL, "udp6", "hwcsum bad");
206: struct evcnt udp6_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
207: NULL, "udp6", "hwcsum ok");
208: struct evcnt udp6_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
209: NULL, "udp6", "hwcsum data");
210: struct evcnt udp6_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
211: NULL, "udp6", "swcsum");
212:
213: EVCNT_ATTACH_STATIC(udp6_hwcsum_bad);
214: EVCNT_ATTACH_STATIC(udp6_hwcsum_ok);
215: EVCNT_ATTACH_STATIC(udp6_hwcsum_data);
216: EVCNT_ATTACH_STATIC(udp6_swcsum);
217: #endif /* defined(INET6) */
218:
219: #define UDP_CSUM_COUNTER_INCR(ev) (ev)->ev_count++
1.120 matt 220:
1.78 thorpej 221: #else
222:
223: #define UDP_CSUM_COUNTER_INCR(ev) /* nothing */
224:
225: #endif /* UDP_CSUM_COUNTERS */
226:
1.179 pooka 227: static void sysctl_net_inet_udp_setup(struct sysctllog **);
228:
1.192 pooka 229: static int
230: do_udpinit(void)
1.1 cgd 231: {
1.18 mycroft 232:
1.35 mycroft 233: in_pcbinit(&udbtable, udbhashsize, udbhashsize);
1.193 pooka 234: udpstat_percpu = percpu_alloc(sizeof(uint64_t) * UDP_NSTATS);
1.78 thorpej 235:
1.98 matt 236: MOWNER_ATTACH(&udp_tx_mowner);
237: MOWNER_ATTACH(&udp_rx_mowner);
238: MOWNER_ATTACH(&udp_mowner);
1.166 thorpej 239:
1.192 pooka 240: return 0;
241: }
242:
243: void
244: udp_init_common(void)
245: {
246: static ONCE_DECL(doudpinit);
247:
248: RUN_ONCE(&doudpinit, do_udpinit);
249: }
250:
251: void
252: udp_init(void)
253: {
254:
255: sysctl_net_inet_udp_setup(NULL);
256:
257: udp_init_common();
1.1 cgd 258: }
259:
1.129 yamt 260: /*
261: * Checksum extended UDP header and data.
262: */
263:
264: int
265: udp_input_checksum(int af, struct mbuf *m, const struct udphdr *uh,
266: int iphlen, int len)
267: {
268:
269: switch (af) {
1.72 itojun 270: #ifdef INET
1.129 yamt 271: case AF_INET:
272: return udp4_input_checksum(m, uh, iphlen, len);
273: #endif
274: #ifdef INET6
275: case AF_INET6:
276: return udp6_input_checksum(m, uh, iphlen, len);
277: #endif
278: }
279: #ifdef DIAGNOSTIC
280: panic("udp_input_checksum: unknown af %d", af);
281: #endif
282: /* NOTREACHED */
283: return -1;
284: }
285:
286: #ifdef INET
287:
288: /*
289: * Checksum extended UDP header and data.
290: */
291:
292: static int
293: udp4_input_checksum(struct mbuf *m, const struct udphdr *uh,
294: int iphlen, int len)
295: {
296:
297: /*
298: * XXX it's better to record and check if this mbuf is
299: * already checked.
300: */
301:
302: if (uh->uh_sum == 0)
303: return 0;
304:
305: switch (m->m_pkthdr.csum_flags &
306: ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv4) |
307: M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) {
308: case M_CSUM_UDPv4|M_CSUM_TCP_UDP_BAD:
309: UDP_CSUM_COUNTER_INCR(&udp_hwcsum_bad);
310: goto badcsum;
311:
312: case M_CSUM_UDPv4|M_CSUM_DATA: {
313: u_int32_t hw_csum = m->m_pkthdr.csum_data;
314:
315: UDP_CSUM_COUNTER_INCR(&udp_hwcsum_data);
316: if (m->m_pkthdr.csum_flags & M_CSUM_NO_PSEUDOHDR) {
317: const struct ip *ip =
318: mtod(m, const struct ip *);
319:
320: hw_csum = in_cksum_phdr(ip->ip_src.s_addr,
321: ip->ip_dst.s_addr,
322: htons(hw_csum + len + IPPROTO_UDP));
323: }
324: if ((hw_csum ^ 0xffff) != 0)
325: goto badcsum;
326: break;
327: }
328:
329: case M_CSUM_UDPv4:
330: /* Checksum was okay. */
331: UDP_CSUM_COUNTER_INCR(&udp_hwcsum_ok);
332: break;
333:
334: default:
335: /*
336: * Need to compute it ourselves. Maybe skip checksum
337: * on loopback interfaces.
338: */
339: if (__predict_true(!(m->m_pkthdr.rcvif->if_flags &
340: IFF_LOOPBACK) ||
341: udp_do_loopback_cksum)) {
342: UDP_CSUM_COUNTER_INCR(&udp_swcsum);
343: if (in4_cksum(m, IPPROTO_UDP, iphlen, len) != 0)
344: goto badcsum;
345: }
346: break;
347: }
348:
349: return 0;
350:
351: badcsum:
1.166 thorpej 352: UDP_STATINC(UDP_STAT_BADSUM);
1.129 yamt 353: return -1;
354: }
355:
1.7 mycroft 356: void
1.27 christos 357: udp_input(struct mbuf *m, ...)
1.1 cgd 358: {
1.53 itojun 359: va_list ap;
360: struct sockaddr_in src, dst;
361: struct ip *ip;
362: struct udphdr *uh;
1.97 simonb 363: int iphlen;
1.53 itojun 364: int len;
365: int n;
1.96 itojun 366: u_int16_t ip_len;
1.53 itojun 367:
368: va_start(ap, m);
369: iphlen = va_arg(ap, int);
1.97 simonb 370: (void)va_arg(ap, int); /* ignore value, advance ap */
1.53 itojun 371: va_end(ap);
372:
1.98 matt 373: MCLAIM(m, &udp_rx_mowner);
1.166 thorpej 374: UDP_STATINC(UDP_STAT_IPACKETS);
1.53 itojun 375:
376: /*
377: * Get IP and UDP header together in first mbuf.
378: */
379: ip = mtod(m, struct ip *);
380: IP6_EXTHDR_GET(uh, struct udphdr *, m, iphlen, sizeof(struct udphdr));
381: if (uh == NULL) {
1.166 thorpej 382: UDP_STATINC(UDP_STAT_HDROPS);
1.53 itojun 383: return;
384: }
1.95 thorpej 385: KASSERT(UDP_HDR_ALIGNED_P(uh));
1.53 itojun 386:
1.57 itojun 387: /* destination port of 0 is illegal, based on RFC768. */
388: if (uh->uh_dport == 0)
389: goto bad;
390:
1.53 itojun 391: /*
392: * Make mbuf data length reflect UDP length.
393: * If not enough data to reflect UDP length, drop.
394: */
1.96 itojun 395: ip_len = ntohs(ip->ip_len);
1.53 itojun 396: len = ntohs((u_int16_t)uh->uh_ulen);
1.96 itojun 397: if (ip_len != iphlen + len) {
398: if (ip_len < iphlen + len || len < sizeof(struct udphdr)) {
1.166 thorpej 399: UDP_STATINC(UDP_STAT_BADLEN);
1.53 itojun 400: goto bad;
401: }
1.96 itojun 402: m_adj(m, iphlen + len - ip_len);
1.53 itojun 403: }
404:
405: /*
406: * Checksum extended UDP header and data.
407: */
1.129 yamt 408: if (udp4_input_checksum(m, uh, iphlen, len))
409: goto badcsum;
1.53 itojun 410:
411: /* construct source and dst sockaddrs. */
1.159 dyoung 412: sockaddr_in_init(&src, &ip->ip_src, uh->uh_sport);
413: sockaddr_in_init(&dst, &ip->ip_dst, uh->uh_dport);
1.53 itojun 414:
1.144 manu 415: if ((n = udp4_realinput(&src, &dst, &m, iphlen)) == -1) {
1.166 thorpej 416: UDP_STATINC(UDP_STAT_HDROPS);
1.144 manu 417: return;
418: }
1.188 christos 419: if (m == NULL) {
420: /*
421: * packet has been processed by ESP stuff -
422: * e.g. dropped NAT-T-keep-alive-packet ...
423: */
424: return;
425: }
426: ip = mtod(m, struct ip *);
1.53 itojun 427: #ifdef INET6
428: if (IN_MULTICAST(ip->ip_dst.s_addr) || n == 0) {
429: struct sockaddr_in6 src6, dst6;
430:
1.175 cegger 431: memset(&src6, 0, sizeof(src6));
1.53 itojun 432: src6.sin6_family = AF_INET6;
433: src6.sin6_len = sizeof(struct sockaddr_in6);
434: src6.sin6_addr.s6_addr[10] = src6.sin6_addr.s6_addr[11] = 0xff;
1.177 tsutsui 435: memcpy(&src6.sin6_addr.s6_addr[12], &ip->ip_src,
1.53 itojun 436: sizeof(ip->ip_src));
437: src6.sin6_port = uh->uh_sport;
1.175 cegger 438: memset(&dst6, 0, sizeof(dst6));
1.53 itojun 439: dst6.sin6_family = AF_INET6;
440: dst6.sin6_len = sizeof(struct sockaddr_in6);
441: dst6.sin6_addr.s6_addr[10] = dst6.sin6_addr.s6_addr[11] = 0xff;
1.177 tsutsui 442: memcpy(&dst6.sin6_addr.s6_addr[12], &ip->ip_dst,
1.53 itojun 443: sizeof(ip->ip_dst));
444: dst6.sin6_port = uh->uh_dport;
445:
446: n += udp6_realinput(AF_INET, &src6, &dst6, m, iphlen);
447: }
448: #endif
449:
450: if (n == 0) {
451: if (m->m_flags & (M_BCAST | M_MCAST)) {
1.166 thorpej 452: UDP_STATINC(UDP_STAT_NOPORTBCAST);
1.53 itojun 453: goto bad;
454: }
1.166 thorpej 455: UDP_STATINC(UDP_STAT_NOPORT);
1.64 ws 456: #ifdef IPKDB
1.53 itojun 457: if (checkipkdb(&ip->ip_src, uh->uh_sport, uh->uh_dport,
458: m, iphlen + sizeof(struct udphdr),
459: m->m_pkthdr.len - iphlen - sizeof(struct udphdr))) {
460: /*
461: * It was a debugger connect packet,
462: * just drop it now
463: */
464: goto bad;
465: }
466: #endif
467: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
468: m = NULL;
469: }
470:
471: bad:
472: if (m)
473: m_freem(m);
1.78 thorpej 474: return;
475:
476: badcsum:
477: m_freem(m);
1.53 itojun 478: }
1.72 itojun 479: #endif
1.53 itojun 480:
481: #ifdef INET6
1.129 yamt 482: static int
483: udp6_input_checksum(struct mbuf *m, const struct udphdr *uh, int off, int len)
484: {
485:
1.140 yamt 486: /*
487: * XXX it's better to record and check if this mbuf is
488: * already checked.
489: */
490:
1.129 yamt 491: if (__predict_false((m->m_flags & M_LOOP) && !udp_do_loopback_cksum)) {
492: goto good;
493: }
494: if (uh->uh_sum == 0) {
1.168 thorpej 495: UDP6_STATINC(UDP6_STAT_NOSUM);
1.129 yamt 496: goto bad;
497: }
1.140 yamt 498:
499: switch (m->m_pkthdr.csum_flags &
500: ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv6) |
501: M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) {
502: case M_CSUM_UDPv6|M_CSUM_TCP_UDP_BAD:
503: UDP_CSUM_COUNTER_INCR(&udp6_hwcsum_bad);
1.168 thorpej 504: UDP6_STATINC(UDP6_STAT_BADSUM);
1.129 yamt 505: goto bad;
1.140 yamt 506:
507: #if 0 /* notyet */
508: case M_CSUM_UDPv6|M_CSUM_DATA:
509: #endif
510:
511: case M_CSUM_UDPv6:
512: /* Checksum was okay. */
513: UDP_CSUM_COUNTER_INCR(&udp6_hwcsum_ok);
514: break;
515:
516: default:
517: /*
518: * Need to compute it ourselves. Maybe skip checksum
519: * on loopback interfaces.
520: */
521: UDP_CSUM_COUNTER_INCR(&udp6_swcsum);
522: if (in6_cksum(m, IPPROTO_UDP, off, len) != 0) {
1.168 thorpej 523: UDP6_STATINC(UDP6_STAT_BADSUM);
1.140 yamt 524: goto bad;
525: }
1.129 yamt 526: }
527:
528: good:
529: return 0;
530: bad:
531: return -1;
532: }
533:
1.53 itojun 534: int
1.154 yamt 535: udp6_input(struct mbuf **mp, int *offp, int proto)
1.53 itojun 536: {
537: struct mbuf *m = *mp;
538: int off = *offp;
539: struct sockaddr_in6 src, dst;
540: struct ip6_hdr *ip6;
541: struct udphdr *uh;
542: u_int32_t plen, ulen;
543:
1.76 itojun 544: ip6 = mtod(m, struct ip6_hdr *);
545:
1.53 itojun 546: #if defined(NFAITH) && 0 < NFAITH
1.76 itojun 547: if (faithprefix(&ip6->ip6_dst)) {
548: /* send icmp6 host unreach? */
549: m_freem(m);
550: return IPPROTO_DONE;
1.53 itojun 551: }
552: #endif
553:
1.168 thorpej 554: UDP6_STATINC(UDP6_STAT_IPACKETS);
1.53 itojun 555:
556: /* check for jumbogram is done in ip6_input. we can trust pkthdr.len */
557: plen = m->m_pkthdr.len - off;
558: IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(struct udphdr));
559: if (uh == NULL) {
1.167 thorpej 560: IP6_STATINC(IP6_STAT_TOOSHORT);
1.53 itojun 561: return IPPROTO_DONE;
562: }
1.95 thorpej 563: KASSERT(UDP_HDR_ALIGNED_P(uh));
1.53 itojun 564: ulen = ntohs((u_short)uh->uh_ulen);
1.69 itojun 565: /*
566: * RFC2675 section 4: jumbograms will have 0 in the UDP header field,
567: * iff payload length > 0xffff.
568: */
1.53 itojun 569: if (ulen == 0 && plen > 0xffff)
570: ulen = plen;
571:
572: if (plen != ulen) {
1.168 thorpej 573: UDP6_STATINC(UDP6_STAT_BADLEN);
1.54 itojun 574: goto bad;
575: }
576:
1.57 itojun 577: /* destination port of 0 is illegal, based on RFC768. */
578: if (uh->uh_dport == 0)
579: goto bad;
580:
1.54 itojun 581: /* Be proactive about malicious use of IPv4 mapped address */
582: if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
583: IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
584: /* XXX stat */
1.53 itojun 585: goto bad;
586: }
587:
588: /*
1.125 thorpej 589: * Checksum extended UDP header and data. Maybe skip checksum
590: * on loopback interfaces.
1.53 itojun 591: */
1.129 yamt 592: if (udp6_input_checksum(m, uh, off, ulen))
593: goto bad;
1.53 itojun 594:
595: /*
596: * Construct source and dst sockaddrs.
597: */
1.175 cegger 598: memset(&src, 0, sizeof(src));
1.53 itojun 599: src.sin6_family = AF_INET6;
600: src.sin6_len = sizeof(struct sockaddr_in6);
1.146 rpaulo 601: src.sin6_addr = ip6->ip6_src;
1.53 itojun 602: src.sin6_port = uh->uh_sport;
1.175 cegger 603: memset(&dst, 0, sizeof(dst));
1.53 itojun 604: dst.sin6_family = AF_INET6;
605: dst.sin6_len = sizeof(struct sockaddr_in6);
1.146 rpaulo 606: dst.sin6_addr = ip6->ip6_dst;
1.53 itojun 607: dst.sin6_port = uh->uh_dport;
608:
609: if (udp6_realinput(AF_INET6, &src, &dst, m, off) == 0) {
610: if (m->m_flags & M_MCAST) {
1.168 thorpej 611: UDP6_STATINC(UDP6_STAT_NOPORTMCAST);
1.53 itojun 612: goto bad;
613: }
1.168 thorpej 614: UDP6_STATINC(UDP6_STAT_NOPORT);
1.53 itojun 615: icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
616: m = NULL;
617: }
618:
619: bad:
620: if (m)
621: m_freem(m);
622: return IPPROTO_DONE;
623: }
624: #endif
625:
1.72 itojun 626: #ifdef INET
1.53 itojun 627: static void
1.119 matt 628: udp4_sendup(struct mbuf *m, int off /* offset of data portion */,
629: struct sockaddr *src, struct socket *so)
1.53 itojun 630: {
631: struct mbuf *opts = NULL;
632: struct mbuf *n;
633: struct inpcb *inp = NULL;
634:
635: if (!so)
636: return;
637: switch (so->so_proto->pr_domain->dom_family) {
638: case AF_INET:
639: inp = sotoinpcb(so);
640: break;
641: #ifdef INET6
642: case AF_INET6:
643: break;
644: #endif
645: default:
646: return;
647: }
648:
1.190 christos 649: #if defined(IPSEC)
1.53 itojun 650: /* check AH/ESP integrity. */
651: if (so != NULL && ipsec4_in_reject_so(m, so)) {
1.169 thorpej 652: IPSEC_STATINC(IPSEC_STAT_IN_POLVIO);
1.162 dyoung 653: if ((n = m_copypacket(m, M_DONTWAIT)) != NULL)
1.110 itojun 654: icmp_error(n, ICMP_UNREACH, ICMP_UNREACH_ADMIN_PROHIBIT,
655: 0, 0);
1.53 itojun 656: return;
657: }
658: #endif /*IPSEC*/
659:
1.162 dyoung 660: if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) {
1.53 itojun 661: if (inp && (inp->inp_flags & INP_CONTROLOPTS
1.174 christos 662: #ifdef SO_OTIMESTAMP
663: || so->so_options & SO_OTIMESTAMP
664: #endif
1.53 itojun 665: || so->so_options & SO_TIMESTAMP)) {
666: struct ip *ip = mtod(n, struct ip *);
667: ip_savecontrol(inp, &opts, ip, n);
668: }
669:
670: m_adj(n, off);
671: if (sbappendaddr(&so->so_rcv, src, n,
672: opts) == 0) {
673: m_freem(n);
674: if (opts)
675: m_freem(opts);
1.124 darrenr 676: so->so_rcv.sb_overflowed++;
1.166 thorpej 677: UDP_STATINC(UDP_STAT_FULLSOCK);
1.53 itojun 678: } else
679: sorwakeup(so);
680: }
681: }
1.72 itojun 682: #endif
1.53 itojun 683:
684: #ifdef INET6
685: static void
1.119 matt 686: udp6_sendup(struct mbuf *m, int off /* offset of data portion */,
687: struct sockaddr *src, struct socket *so)
1.53 itojun 688: {
689: struct mbuf *opts = NULL;
690: struct mbuf *n;
691: struct in6pcb *in6p = NULL;
692:
693: if (!so)
694: return;
695: if (so->so_proto->pr_domain->dom_family != AF_INET6)
696: return;
697: in6p = sotoin6pcb(so);
698:
1.190 christos 699: #if defined(IPSEC)
1.53 itojun 700: /* check AH/ESP integrity. */
701: if (so != NULL && ipsec6_in_reject_so(m, so)) {
1.169 thorpej 702: IPSEC6_STATINC(IPSEC_STAT_IN_POLVIO);
1.162 dyoung 703: if ((n = m_copypacket(m, M_DONTWAIT)) != NULL)
1.110 itojun 704: icmp6_error(n, ICMP6_DST_UNREACH,
705: ICMP6_DST_UNREACH_ADMIN, 0);
1.53 itojun 706: return;
707: }
708: #endif /*IPSEC*/
709:
1.162 dyoung 710: if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) {
1.53 itojun 711: if (in6p && (in6p->in6p_flags & IN6P_CONTROLOPTS
1.174 christos 712: #ifdef SO_OTIMESTAMP
713: || in6p->in6p_socket->so_options & SO_OTIMESTAMP
714: #endif
715: || in6p->in6p_socket->so_options & SO_TIMESTAMP)) {
1.53 itojun 716: struct ip6_hdr *ip6 = mtod(n, struct ip6_hdr *);
717: ip6_savecontrol(in6p, &opts, ip6, n);
718: }
719:
720: m_adj(n, off);
721: if (sbappendaddr(&so->so_rcv, src, n, opts) == 0) {
722: m_freem(n);
723: if (opts)
724: m_freem(opts);
1.124 darrenr 725: so->so_rcv.sb_overflowed++;
1.168 thorpej 726: UDP6_STATINC(UDP6_STAT_FULLSOCK);
1.53 itojun 727: } else
728: sorwakeup(so);
729: }
730: }
731: #endif
732:
1.72 itojun 733: #ifdef INET
1.53 itojun 734: static int
1.119 matt 735: udp4_realinput(struct sockaddr_in *src, struct sockaddr_in *dst,
1.144 manu 736: struct mbuf **mp, int off /* offset of udphdr */)
1.53 itojun 737: {
738: u_int16_t *sport, *dport;
739: int rcvcnt;
740: struct in_addr *src4, *dst4;
1.109 itojun 741: struct inpcb_hdr *inph;
1.53 itojun 742: struct inpcb *inp;
1.144 manu 743: struct mbuf *m = *mp;
1.53 itojun 744:
745: rcvcnt = 0;
746: off += sizeof(struct udphdr); /* now, offset of payload */
747:
748: if (src->sin_family != AF_INET || dst->sin_family != AF_INET)
749: goto bad;
750:
751: src4 = &src->sin_addr;
752: sport = &src->sin_port;
753: dst4 = &dst->sin_addr;
754: dport = &dst->sin_port;
755:
1.73 itojun 756: if (IN_MULTICAST(dst4->s_addr) ||
1.53 itojun 757: in_broadcast(*dst4, m->m_pkthdr.rcvif)) {
758: /*
759: * Deliver a multicast or broadcast datagram to *all* sockets
760: * for which the local and remote addresses and ports match
761: * those of the incoming datagram. This allows more than
762: * one process to receive multi/broadcasts on the same port.
763: * (This really ought to be done for unicast datagrams as
764: * well, but that would cause problems with existing
765: * applications that open both address-specific sockets and
766: * a wildcard socket listening to the same port -- they would
767: * end up receiving duplicates of every unicast datagram.
768: * Those applications open the multiple sockets to overcome an
769: * inadequacy of the UDP socket interface, but for backwards
770: * compatibility we avoid the problem here rather than
771: * fixing the interface. Maybe 4.5BSD will remedy this?)
772: */
773:
774: /*
1.92 itojun 775: * KAME note: traditionally we dropped udpiphdr from mbuf here.
1.71 itojun 776: * we need udpiphdr for IPsec processing so we do that later.
1.53 itojun 777: */
778: /*
779: * Locate pcb(s) for datagram.
780: */
1.191 christos 781: TAILQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) {
1.109 itojun 782: inp = (struct inpcb *)inph;
783: if (inp->inp_af != AF_INET)
784: continue;
785:
1.53 itojun 786: if (inp->inp_lport != *dport)
787: continue;
788: if (!in_nullhost(inp->inp_laddr)) {
789: if (!in_hosteq(inp->inp_laddr, *dst4))
790: continue;
791: }
792: if (!in_nullhost(inp->inp_faddr)) {
793: if (!in_hosteq(inp->inp_faddr, *src4) ||
794: inp->inp_fport != *sport)
795: continue;
796: }
797:
798: udp4_sendup(m, off, (struct sockaddr *)src,
799: inp->inp_socket);
800: rcvcnt++;
801:
802: /*
803: * Don't look for additional matches if this one does
804: * not have either the SO_REUSEPORT or SO_REUSEADDR
805: * socket options set. This heuristic avoids searching
806: * through all pcbs in the common case of a non-shared
807: * port. It assumes that an application will never
808: * clear these options after setting them.
809: */
810: if ((inp->inp_socket->so_options &
811: (SO_REUSEPORT|SO_REUSEADDR)) == 0)
812: break;
813: }
814: } else {
815: /*
816: * Locate pcb for datagram.
817: */
1.180 dyoung 818: inp = in_pcblookup_connect(&udbtable, *src4, *sport, *dst4,
819: *dport, 0);
1.53 itojun 820: if (inp == 0) {
1.166 thorpej 821: UDP_STATINC(UDP_STAT_PCBHASHMISS);
1.53 itojun 822: inp = in_pcblookup_bind(&udbtable, *dst4, *dport);
1.82 itojun 823: if (inp == 0)
1.53 itojun 824: return rcvcnt;
825: }
826:
1.190 christos 827: #ifdef IPSEC
1.130 manu 828: /* Handle ESP over UDP */
829: if (inp->inp_flags & INP_ESPINUDP_ALL) {
830: struct sockaddr *sa = (struct sockaddr *)src;
831:
1.144 manu 832: switch(udp4_espinudp(mp, off, sa, inp->inp_socket)) {
833: case -1: /* Error, m was freeed */
834: rcvcnt = -1;
835: goto bad;
836: break;
837:
838: case 1: /* ESP over UDP */
1.130 manu 839: rcvcnt++;
840: goto bad;
1.144 manu 841: break;
842:
843: case 0: /* plain UDP */
844: default: /* Unexpected */
845: /*
846: * Normal UDP processing will take place
847: * m may have changed.
848: */
849: m = *mp;
850: break;
1.130 manu 851: }
852: }
1.189 christos 853: #endif
1.130 manu 854:
1.178 minskim 855: /*
856: * Check the minimum TTL for socket.
857: */
858: if (mtod(m, struct ip *)->ip_ttl < inp->inp_ip_minttl)
859: goto bad;
860:
1.53 itojun 861: udp4_sendup(m, off, (struct sockaddr *)src, inp->inp_socket);
862: rcvcnt++;
863: }
864:
865: bad:
866: return rcvcnt;
867: }
1.72 itojun 868: #endif
1.53 itojun 869:
870: #ifdef INET6
871: static int
1.119 matt 872: udp6_realinput(int af, struct sockaddr_in6 *src, struct sockaddr_in6 *dst,
873: struct mbuf *m, int off)
1.53 itojun 874: {
1.79 itojun 875: u_int16_t sport, dport;
1.53 itojun 876: int rcvcnt;
1.146 rpaulo 877: struct in6_addr src6, *dst6;
1.79 itojun 878: const struct in_addr *dst4;
1.109 itojun 879: struct inpcb_hdr *inph;
1.53 itojun 880: struct in6pcb *in6p;
881:
882: rcvcnt = 0;
883: off += sizeof(struct udphdr); /* now, offset of payload */
884:
885: if (af != AF_INET && af != AF_INET6)
886: goto bad;
887: if (src->sin6_family != AF_INET6 || dst->sin6_family != AF_INET6)
888: goto bad;
889:
1.146 rpaulo 890: src6 = src->sin6_addr;
891: if (sa6_recoverscope(src) != 0) {
892: /* XXX: should be impossible. */
893: goto bad;
894: }
1.79 itojun 895: sport = src->sin6_port;
1.146 rpaulo 896:
1.79 itojun 897: dport = dst->sin6_port;
1.88 itojun 898: dst4 = (struct in_addr *)&dst->sin6_addr.s6_addr[12];
1.146 rpaulo 899: dst6 = &dst->sin6_addr;
1.53 itojun 900:
1.146 rpaulo 901: if (IN6_IS_ADDR_MULTICAST(dst6) ||
1.79 itojun 902: (af == AF_INET && IN_MULTICAST(dst4->s_addr))) {
1.53 itojun 903: /*
904: * Deliver a multicast or broadcast datagram to *all* sockets
905: * for which the local and remote addresses and ports match
906: * those of the incoming datagram. This allows more than
907: * one process to receive multi/broadcasts on the same port.
908: * (This really ought to be done for unicast datagrams as
909: * well, but that would cause problems with existing
910: * applications that open both address-specific sockets and
911: * a wildcard socket listening to the same port -- they would
912: * end up receiving duplicates of every unicast datagram.
913: * Those applications open the multiple sockets to overcome an
914: * inadequacy of the UDP socket interface, but for backwards
915: * compatibility we avoid the problem here rather than
916: * fixing the interface. Maybe 4.5BSD will remedy this?)
917: */
918:
919: /*
1.92 itojun 920: * KAME note: traditionally we dropped udpiphdr from mbuf here.
1.71 itojun 921: * we need udpiphdr for IPsec processing so we do that later.
1.53 itojun 922: */
923: /*
924: * Locate pcb(s) for datagram.
925: */
1.191 christos 926: TAILQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) {
1.109 itojun 927: in6p = (struct in6pcb *)inph;
928: if (in6p->in6p_af != AF_INET6)
929: continue;
930:
1.79 itojun 931: if (in6p->in6p_lport != dport)
1.53 itojun 932: continue;
933: if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
1.146 rpaulo 934: if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr,
935: dst6))
1.53 itojun 936: continue;
1.92 itojun 937: } else {
1.146 rpaulo 938: if (IN6_IS_ADDR_V4MAPPED(dst6) &&
1.85 itojun 939: (in6p->in6p_flags & IN6P_IPV6_V6ONLY))
1.55 itojun 940: continue;
941: }
1.53 itojun 942: if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
1.79 itojun 943: if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr,
944: &src6) || in6p->in6p_fport != sport)
1.53 itojun 945: continue;
1.92 itojun 946: } else {
1.79 itojun 947: if (IN6_IS_ADDR_V4MAPPED(&src6) &&
1.85 itojun 948: (in6p->in6p_flags & IN6P_IPV6_V6ONLY))
1.55 itojun 949: continue;
950: }
1.53 itojun 951:
952: udp6_sendup(m, off, (struct sockaddr *)src,
953: in6p->in6p_socket);
954: rcvcnt++;
955:
956: /*
957: * Don't look for additional matches if this one does
958: * not have either the SO_REUSEPORT or SO_REUSEADDR
959: * socket options set. This heuristic avoids searching
960: * through all pcbs in the common case of a non-shared
961: * port. It assumes that an application will never
962: * clear these options after setting them.
963: */
964: if ((in6p->in6p_socket->so_options &
965: (SO_REUSEPORT|SO_REUSEADDR)) == 0)
966: break;
967: }
968: } else {
969: /*
970: * Locate pcb for datagram.
971: */
1.146 rpaulo 972: in6p = in6_pcblookup_connect(&udbtable, &src6, sport, dst6,
1.180 dyoung 973: dport, 0, 0);
1.53 itojun 974: if (in6p == 0) {
1.166 thorpej 975: UDP_STATINC(UDP_STAT_PCBHASHMISS);
1.146 rpaulo 976: in6p = in6_pcblookup_bind(&udbtable, dst6, dport, 0);
1.82 itojun 977: if (in6p == 0)
1.53 itojun 978: return rcvcnt;
979: }
980:
981: udp6_sendup(m, off, (struct sockaddr *)src, in6p->in6p_socket);
982: rcvcnt++;
983: }
984:
985: bad:
986: return rcvcnt;
987: }
988: #endif
1.1 cgd 989:
1.72 itojun 990: #ifdef INET
1.1 cgd 991: /*
992: * Notify a udp user of an asynchronous error;
993: * just wake up so that he can collect error status.
994: */
1.7 mycroft 995: static void
1.119 matt 996: udp_notify(struct inpcb *inp, int errno)
1.1 cgd 997: {
998: inp->inp_socket->so_error = errno;
999: sorwakeup(inp->inp_socket);
1000: sowwakeup(inp->inp_socket);
1001: }
1002:
1.27 christos 1003: void *
1.157 dyoung 1004: udp_ctlinput(int cmd, const struct sockaddr *sa, void *v)
1.1 cgd 1005: {
1.66 augustss 1006: struct ip *ip = v;
1007: struct udphdr *uh;
1.119 matt 1008: void (*notify)(struct inpcb *, int) = udp_notify;
1.21 mycroft 1009: int errno;
1.1 cgd 1010:
1.53 itojun 1011: if (sa->sa_family != AF_INET
1012: || sa->sa_len != sizeof(struct sockaddr_in))
1.51 itojun 1013: return NULL;
1.20 mycroft 1014: if ((unsigned)cmd >= PRC_NCMDS)
1.27 christos 1015: return NULL;
1.20 mycroft 1016: errno = inetctlerrmap[cmd];
1.18 mycroft 1017: if (PRC_IS_REDIRECT(cmd))
1.19 mycroft 1018: notify = in_rtchange, ip = 0;
1.18 mycroft 1019: else if (cmd == PRC_HOSTDEAD)
1.19 mycroft 1020: ip = 0;
1.23 cgd 1021: else if (errno == 0)
1.27 christos 1022: return NULL;
1.19 mycroft 1023: if (ip) {
1.158 christos 1024: uh = (struct udphdr *)((char *)ip + (ip->ip_hl << 2));
1.157 dyoung 1025: in_pcbnotify(&udbtable, satocsin(sa)->sin_addr, uh->uh_dport,
1.34 mycroft 1026: ip->ip_src, uh->uh_sport, errno, notify);
1.53 itojun 1027:
1028: /* XXX mapped address case */
1.19 mycroft 1029: } else
1.157 dyoung 1030: in_pcbnotifyall(&udbtable, satocsin(sa)->sin_addr, errno,
1.34 mycroft 1031: notify);
1.27 christos 1032: return NULL;
1.1 cgd 1033: }
1034:
1.7 mycroft 1035: int
1.173 plunky 1036: udp_ctloutput(int op, struct socket *so, struct sockopt *sopt)
1.130 manu 1037: {
1038: int s;
1039: int error = 0;
1040: struct inpcb *inp;
1041: int family;
1.173 plunky 1042: int optval;
1.130 manu 1043:
1044: family = so->so_proto->pr_domain->dom_family;
1045:
1046: s = splsoftnet();
1047: switch (family) {
1048: #ifdef INET
1049: case PF_INET:
1.173 plunky 1050: if (sopt->sopt_level != IPPROTO_UDP) {
1051: error = ip_ctloutput(op, so, sopt);
1.130 manu 1052: goto end;
1053: }
1054: break;
1055: #endif
1056: #ifdef INET6
1057: case PF_INET6:
1.173 plunky 1058: if (sopt->sopt_level != IPPROTO_UDP) {
1059: error = ip6_ctloutput(op, so, sopt);
1.130 manu 1060: goto end;
1061: }
1062: break;
1063: #endif
1064: default:
1065: error = EAFNOSUPPORT;
1066: goto end;
1067: }
1068:
1069:
1070: switch (op) {
1071: case PRCO_SETOPT:
1072: inp = sotoinpcb(so);
1073:
1.173 plunky 1074: switch (sopt->sopt_name) {
1.130 manu 1075: case UDP_ENCAP:
1.173 plunky 1076: error = sockopt_getint(sopt, &optval);
1077: if (error)
1.153 yamt 1078: break;
1.131 perry 1079:
1.173 plunky 1080: switch(optval) {
1.130 manu 1081: case 0:
1082: inp->inp_flags &= ~INP_ESPINUDP_ALL;
1083: break;
1084:
1085: case UDP_ENCAP_ESPINUDP:
1086: inp->inp_flags &= ~INP_ESPINUDP_ALL;
1087: inp->inp_flags |= INP_ESPINUDP;
1088: break;
1.131 perry 1089:
1.130 manu 1090: case UDP_ENCAP_ESPINUDP_NON_IKE:
1091: inp->inp_flags &= ~INP_ESPINUDP_ALL;
1092: inp->inp_flags |= INP_ESPINUDP_NON_IKE;
1093: break;
1094: default:
1095: error = EINVAL;
1096: break;
1097: }
1098: break;
1.183 christos 1099:
1.130 manu 1100: default:
1101: error = ENOPROTOOPT;
1102: break;
1103: }
1104: break;
1105:
1106: default:
1107: error = EINVAL;
1108: break;
1.131 perry 1109: }
1110:
1.130 manu 1111: end:
1112: splx(s);
1113: return error;
1114: }
1.131 perry 1115:
1.130 manu 1116:
1117: int
1.27 christos 1118: udp_output(struct mbuf *m, ...)
1119: {
1.66 augustss 1120: struct inpcb *inp;
1121: struct udpiphdr *ui;
1.125 thorpej 1122: struct route *ro;
1.66 augustss 1123: int len = m->m_pkthdr.len;
1.31 mycroft 1124: int error = 0;
1.27 christos 1125: va_list ap;
1126:
1.98 matt 1127: MCLAIM(m, &udp_tx_mowner);
1.27 christos 1128: va_start(ap, m);
1129: inp = va_arg(ap, struct inpcb *);
1130: va_end(ap);
1.1 cgd 1131:
1132: /*
1133: * Calculate data length and get a mbuf
1134: * for UDP and IP headers.
1135: */
1.13 mycroft 1136: M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT);
1137: if (m == 0) {
1138: error = ENOBUFS;
1.39 thorpej 1139: goto release;
1140: }
1141:
1142: /*
1143: * Compute the packet length of the IP header, and
1144: * punt if the length looks bogus.
1145: */
1.96 itojun 1146: if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) {
1.39 thorpej 1147: error = EMSGSIZE;
1.13 mycroft 1148: goto release;
1149: }
1.1 cgd 1150:
1151: /*
1152: * Fill in mbuf with extended UDP header
1153: * and addresses and length put into network format.
1154: */
1155: ui = mtod(m, struct udpiphdr *);
1156: ui->ui_pr = IPPROTO_UDP;
1157: ui->ui_src = inp->inp_laddr;
1158: ui->ui_dst = inp->inp_faddr;
1159: ui->ui_sport = inp->inp_lport;
1160: ui->ui_dport = inp->inp_fport;
1.78 thorpej 1161: ui->ui_ulen = htons((u_int16_t)len + sizeof(struct udphdr));
1.1 cgd 1162:
1.125 thorpej 1163: ro = &inp->inp_route;
1164:
1.1 cgd 1165: /*
1.78 thorpej 1166: * Set up checksum and output datagram.
1.1 cgd 1167: */
1168: if (udpcksum) {
1.78 thorpej 1169: /*
1170: * XXX Cache pseudo-header checksum part for
1171: * XXX "connected" UDP sockets.
1172: */
1173: ui->ui_sum = in_cksum_phdr(ui->ui_src.s_addr,
1174: ui->ui_dst.s_addr, htons((u_int16_t)len +
1175: sizeof(struct udphdr) + IPPROTO_UDP));
1.135 yamt 1176: m->m_pkthdr.csum_flags = M_CSUM_UDPv4;
1.78 thorpej 1177: m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
1178: } else
1179: ui->ui_sum = 0;
1.96 itojun 1180: ((struct ip *)ui)->ip_len = htons(sizeof (struct udpiphdr) + len);
1.1 cgd 1181: ((struct ip *)ui)->ip_ttl = inp->inp_ip.ip_ttl; /* XXX */
1182: ((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; /* XXX */
1.166 thorpej 1183: UDP_STATINC(UDP_STAT_OPACKETS);
1.48 itojun 1184:
1.125 thorpej 1185: return (ip_output(m, inp->inp_options, ro,
1.12 mycroft 1186: inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST),
1.107 itojun 1187: inp->inp_moptions, inp->inp_socket));
1.1 cgd 1188:
1189: release:
1190: m_freem(m);
1191: return (error);
1192: }
1193:
1.42 thorpej 1194: int udp_sendspace = 9216; /* really max datagram size */
1195: int udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in));
1.1 cgd 1196: /* 40 1K datagrams */
1197:
1198: /*ARGSUSED*/
1.7 mycroft 1199: int
1.119 matt 1200: udp_usrreq(struct socket *so, int req, struct mbuf *m, struct mbuf *nam,
1.145 christos 1201: struct mbuf *control, struct lwp *l)
1.1 cgd 1202: {
1.66 augustss 1203: struct inpcb *inp;
1.1 cgd 1204: int s;
1.66 augustss 1205: int error = 0;
1.1 cgd 1206:
1207: if (req == PRU_CONTROL)
1.158 christos 1208: return (in_control(so, (long)m, (void *)nam,
1.148 ad 1209: (struct ifnet *)control, l));
1.59 thorpej 1210:
1.149 tls 1211: s = splsoftnet();
1212:
1.60 thorpej 1213: if (req == PRU_PURGEIF) {
1.170 ad 1214: mutex_enter(softnet_lock);
1.80 itojun 1215: in_pcbpurgeif0(&udbtable, (struct ifnet *)control);
1.60 thorpej 1216: in_purgeif((struct ifnet *)control);
1217: in_pcbpurgeif(&udbtable, (struct ifnet *)control);
1.170 ad 1218: mutex_exit(softnet_lock);
1.149 tls 1219: splx(s);
1.59 thorpej 1220: return (0);
1221: }
1.31 mycroft 1222:
1223: inp = sotoinpcb(so);
1.32 mycroft 1224: #ifdef DIAGNOSTIC
1225: if (req != PRU_SEND && req != PRU_SENDOOB && control)
1226: panic("udp_usrreq: unexpected control mbuf");
1227: #endif
1.170 ad 1228: if (req == PRU_ATTACH) {
1229: sosetlock(so);
1230: } else if (inp == 0) {
1.31 mycroft 1231: error = EINVAL;
1232: goto release;
1233: }
1234:
1.1 cgd 1235: /*
1236: * Note: need to block udp_input while changing
1237: * the udp pcb queue and/or pcb addresses.
1238: */
1239: switch (req) {
1240:
1241: case PRU_ATTACH:
1.31 mycroft 1242: if (inp != 0) {
1243: error = EISCONN;
1.1 cgd 1244: break;
1245: }
1.98 matt 1246: #ifdef MBUFTRACE
1247: so->so_mowner = &udp_mowner;
1248: so->so_rcv.sb_mowner = &udp_rx_mowner;
1249: so->so_snd.sb_mowner = &udp_tx_mowner;
1250: #endif
1.31 mycroft 1251: if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
1252: error = soreserve(so, udp_sendspace, udp_recvspace);
1253: if (error)
1254: break;
1255: }
1.18 mycroft 1256: error = in_pcballoc(so, &udbtable);
1.1 cgd 1257: if (error)
1258: break;
1.31 mycroft 1259: inp = sotoinpcb(so);
1260: inp->inp_ip.ip_ttl = ip_defttl;
1.1 cgd 1261: break;
1262:
1263: case PRU_DETACH:
1.31 mycroft 1264: in_pcbdetach(inp);
1.1 cgd 1265: break;
1266:
1267: case PRU_BIND:
1.148 ad 1268: error = in_pcbbind(inp, nam, l);
1.1 cgd 1269: break;
1270:
1271: case PRU_LISTEN:
1272: error = EOPNOTSUPP;
1273: break;
1274:
1275: case PRU_CONNECT:
1.148 ad 1276: error = in_pcbconnect(inp, nam, l);
1.31 mycroft 1277: if (error)
1.1 cgd 1278: break;
1.31 mycroft 1279: soisconnected(so);
1.1 cgd 1280: break;
1281:
1282: case PRU_CONNECT2:
1283: error = EOPNOTSUPP;
1284: break;
1285:
1286: case PRU_DISCONNECT:
1.31 mycroft 1287: /*soisdisconnected(so);*/
1288: so->so_state &= ~SS_ISCONNECTED; /* XXX */
1.1 cgd 1289: in_pcbdisconnect(inp);
1.34 mycroft 1290: inp->inp_laddr = zeroin_addr; /* XXX */
1.35 mycroft 1291: in_pcbstate(inp, INP_BOUND); /* XXX */
1.1 cgd 1292: break;
1293:
1294: case PRU_SHUTDOWN:
1295: socantsendmore(so);
1296: break;
1297:
1.31 mycroft 1298: case PRU_RCVD:
1299: error = EOPNOTSUPP;
1.1 cgd 1300: break;
1301:
1.31 mycroft 1302: case PRU_SEND:
1.32 mycroft 1303: if (control && control->m_len) {
1304: m_freem(control);
1305: m_freem(m);
1306: error = EINVAL;
1307: break;
1308: }
1.31 mycroft 1309: {
1.35 mycroft 1310: struct in_addr laddr; /* XXX */
1.1 cgd 1311:
1.181 mrg 1312: memset(&laddr, 0, sizeof laddr);
1.31 mycroft 1313: if (nam) {
1.35 mycroft 1314: laddr = inp->inp_laddr; /* XXX */
1.31 mycroft 1315: if ((so->so_state & SS_ISCONNECTED) != 0) {
1316: error = EISCONN;
1.32 mycroft 1317: goto die;
1.31 mycroft 1318: }
1.148 ad 1319: error = in_pcbconnect(inp, nam, l);
1.100 matt 1320: if (error)
1321: goto die;
1.31 mycroft 1322: } else {
1323: if ((so->so_state & SS_ISCONNECTED) == 0) {
1324: error = ENOTCONN;
1.32 mycroft 1325: goto die;
1.31 mycroft 1326: }
1327: }
1.33 mycroft 1328: error = udp_output(m, inp);
1.100 matt 1329: m = NULL;
1.31 mycroft 1330: if (nam) {
1331: in_pcbdisconnect(inp);
1.35 mycroft 1332: inp->inp_laddr = laddr; /* XXX */
1333: in_pcbstate(inp, INP_BOUND); /* XXX */
1.31 mycroft 1334: }
1.100 matt 1335: die:
1336: if (m)
1337: m_freem(m);
1.31 mycroft 1338: }
1.1 cgd 1339: break;
1340:
1341: case PRU_SENSE:
1342: /*
1343: * stat: don't bother with a blocksize.
1344: */
1.31 mycroft 1345: splx(s);
1.1 cgd 1346: return (0);
1347:
1.31 mycroft 1348: case PRU_RCVOOB:
1349: error = EOPNOTSUPP;
1350: break;
1351:
1.1 cgd 1352: case PRU_SENDOOB:
1.32 mycroft 1353: m_freem(control);
1.31 mycroft 1354: m_freem(m);
1.1 cgd 1355: error = EOPNOTSUPP;
1356: break;
1357:
1.31 mycroft 1358: case PRU_SOCKADDR:
1359: in_setsockaddr(inp, nam);
1360: break;
1361:
1362: case PRU_PEERADDR:
1363: in_setpeeraddr(inp, nam);
1364: break;
1.1 cgd 1365:
1366: default:
1367: panic("udp_usrreq");
1368: }
1369:
1370: release:
1.31 mycroft 1371: splx(s);
1.1 cgd 1372: return (error);
1.13 mycroft 1373: }
1374:
1.166 thorpej 1375: static int
1376: sysctl_net_inet_udp_stats(SYSCTLFN_ARGS)
1377: {
1378:
1.172 thorpej 1379: return (NETSTAT_SYSCTL(udpstat_percpu, UDP_NSTATS));
1.166 thorpej 1380: }
1381:
1.13 mycroft 1382: /*
1383: * Sysctl for udp variables.
1384: */
1.179 pooka 1385: static void
1386: sysctl_net_inet_udp_setup(struct sysctllog **clog)
1.13 mycroft 1387: {
1.194 ! pooka 1388:
1.116 atatat 1389: sysctl_createv(clog, 0, NULL, NULL,
1390: CTLFLAG_PERMANENT,
1.114 atatat 1391: CTLTYPE_NODE, "inet", NULL,
1392: NULL, 0, NULL, 0,
1393: CTL_NET, PF_INET, CTL_EOL);
1.116 atatat 1394: sysctl_createv(clog, 0, NULL, NULL,
1395: CTLFLAG_PERMANENT,
1.122 atatat 1396: CTLTYPE_NODE, "udp",
1397: SYSCTL_DESCR("UDPv4 related settings"),
1.114 atatat 1398: NULL, 0, NULL, 0,
1399: CTL_NET, PF_INET, IPPROTO_UDP, CTL_EOL);
1400:
1.116 atatat 1401: sysctl_createv(clog, 0, NULL, NULL,
1402: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122 atatat 1403: CTLTYPE_INT, "checksum",
1.123 heas 1404: SYSCTL_DESCR("Compute UDP checksums"),
1.114 atatat 1405: NULL, 0, &udpcksum, 0,
1406: CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_CHECKSUM,
1407: CTL_EOL);
1.116 atatat 1408: sysctl_createv(clog, 0, NULL, NULL,
1409: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122 atatat 1410: CTLTYPE_INT, "sendspace",
1411: SYSCTL_DESCR("Default UDP send buffer size"),
1.114 atatat 1412: NULL, 0, &udp_sendspace, 0,
1413: CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_SENDSPACE,
1414: CTL_EOL);
1.116 atatat 1415: sysctl_createv(clog, 0, NULL, NULL,
1416: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122 atatat 1417: CTLTYPE_INT, "recvspace",
1418: SYSCTL_DESCR("Default UDP receive buffer size"),
1.114 atatat 1419: NULL, 0, &udp_recvspace, 0,
1420: CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_RECVSPACE,
1421: CTL_EOL);
1.125 thorpej 1422: sysctl_createv(clog, 0, NULL, NULL,
1423: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1424: CTLTYPE_INT, "do_loopback_cksum",
1425: SYSCTL_DESCR("Perform UDP checksum on loopback"),
1426: NULL, 0, &udp_do_loopback_cksum, 0,
1427: CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_LOOPBACKCKSUM,
1428: CTL_EOL);
1.132 atatat 1429: sysctl_createv(clog, 0, NULL, NULL,
1430: CTLFLAG_PERMANENT,
1.134 atatat 1431: CTLTYPE_STRUCT, "pcblist",
1.132 atatat 1432: SYSCTL_DESCR("UDP protocol control block list"),
1433: sysctl_inpcblist, 0, &udbtable, 0,
1434: CTL_NET, PF_INET, IPPROTO_UDP, CTL_CREATE,
1435: CTL_EOL);
1.139 elad 1436: sysctl_createv(clog, 0, NULL, NULL,
1437: CTLFLAG_PERMANENT,
1438: CTLTYPE_STRUCT, "stats",
1439: SYSCTL_DESCR("UDP statistics"),
1.166 thorpej 1440: sysctl_net_inet_udp_stats, 0, NULL, 0,
1.139 elad 1441: CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_STATS,
1442: CTL_EOL);
1.1 cgd 1443: }
1.72 itojun 1444: #endif
1.130 manu 1445:
1.166 thorpej 1446: void
1447: udp_statinc(u_int stat)
1448: {
1449:
1450: KASSERT(stat < UDP_NSTATS);
1451: UDP_STATINC(stat);
1452: }
1453:
1.190 christos 1454: #if defined(INET) && defined(IPSEC)
1.130 manu 1455: /*
1456: * Returns:
1457: * 1 if the packet was processed
1458: * 0 if normal UDP processing should take place
1.144 manu 1459: * -1 if an error occurent and m was freed
1.130 manu 1460: */
1461: static int
1.154 yamt 1462: udp4_espinudp(struct mbuf **mp, int off, struct sockaddr *src,
1.151 christos 1463: struct socket *so)
1.130 manu 1464: {
1465: size_t len;
1.158 christos 1466: void *data;
1.130 manu 1467: struct inpcb *inp;
1468: size_t skip = 0;
1469: size_t minlen;
1470: size_t iphdrlen;
1471: struct ip *ip;
1.136 manu 1472: struct m_tag *tag;
1473: struct udphdr *udphdr;
1474: u_int16_t sport, dport;
1.144 manu 1475: struct mbuf *m = *mp;
1.130 manu 1476:
1.131 perry 1477: /*
1.130 manu 1478: * Collapse the mbuf chain if the first mbuf is too short
1479: * The longest case is: UDP + non ESP marker + ESP
1480: */
1481: minlen = off + sizeof(u_int64_t) + sizeof(struct esp);
1482: if (minlen > m->m_pkthdr.len)
1483: minlen = m->m_pkthdr.len;
1484:
1485: if (m->m_len < minlen) {
1.144 manu 1486: if ((*mp = m_pullup(m, minlen)) == NULL) {
1.130 manu 1487: printf("udp4_espinudp: m_pullup failed\n");
1.144 manu 1488: return -1;
1.130 manu 1489: }
1.144 manu 1490: m = *mp;
1.130 manu 1491: }
1492:
1.131 perry 1493: len = m->m_len - off;
1.158 christos 1494: data = mtod(m, char *) + off;
1.130 manu 1495: inp = sotoinpcb(so);
1496:
1497: /* Ignore keepalive packets */
1.158 christos 1498: if ((len == 1) && (*(unsigned char *)data == 0xff)) {
1.188 christos 1499: m_free(m);
1500: *mp = NULL; /* avoid any further processiong by caller ... */
1.130 manu 1501: return 1;
1502: }
1503:
1.131 perry 1504: /*
1505: * Check that the payload is long enough to hold
1.130 manu 1506: * an ESP header and compute the length of encapsulation
1.131 perry 1507: * header to remove
1.130 manu 1508: */
1509: if (inp->inp_flags & INP_ESPINUDP) {
1510: u_int32_t *st = (u_int32_t *)data;
1511:
1512: if ((len <= sizeof(struct esp)) || (*st == 0))
1513: return 0; /* Normal UDP processing */
1514:
1515: skip = sizeof(struct udphdr);
1516: }
1517:
1518: if (inp->inp_flags & INP_ESPINUDP_NON_IKE) {
1.142 kleink 1519: u_int32_t *st = (u_int32_t *)data;
1.130 manu 1520:
1521: if ((len <= sizeof(u_int64_t) + sizeof(struct esp))
1.142 kleink 1522: || ((st[0] | st[1]) != 0))
1.130 manu 1523: return 0; /* Normal UDP processing */
1.131 perry 1524:
1.130 manu 1525: skip = sizeof(struct udphdr) + sizeof(u_int64_t);
1526: }
1527:
1528: /*
1.136 manu 1529: * Get the UDP ports. They are handled in network
1530: * order everywhere in IPSEC_NAT_T code.
1531: */
1.158 christos 1532: udphdr = (struct udphdr *)((char *)data - skip);
1.136 manu 1533: sport = udphdr->uh_sport;
1534: dport = udphdr->uh_dport;
1535:
1536: /*
1.130 manu 1537: * Remove the UDP header (and possibly the non ESP marker)
1538: * IP header lendth is iphdrlen
1.131 perry 1539: * Before:
1.130 manu 1540: * <--- off --->
1541: * +----+------+-----+
1542: * | IP | UDP | ESP |
1543: * +----+------+-----+
1544: * <-skip->
1545: * After:
1546: * +----+-----+
1547: * | IP | ESP |
1548: * +----+-----+
1549: * <-skip->
1550: */
1551: iphdrlen = off - sizeof(struct udphdr);
1.158 christos 1552: memmove(mtod(m, char *) + skip, mtod(m, void *), iphdrlen);
1.130 manu 1553: m_adj(m, skip);
1554:
1555: ip = mtod(m, struct ip *);
1556: ip->ip_len = htons(ntohs(ip->ip_len) - skip);
1557: ip->ip_p = IPPROTO_ESP;
1558:
1559: /*
1.188 christos 1560: * We have modified the packet - it is now ESP, so we should not
1561: * return to UDP processing ...
1562: *
1.136 manu 1563: * Add a PACKET_TAG_IPSEC_NAT_T_PORT tag to remember
1564: * the source UDP port. This is required if we want
1565: * to select the right SPD for multiple hosts behind
1566: * same NAT
1567: */
1.137 manu 1568: if ((tag = m_tag_get(PACKET_TAG_IPSEC_NAT_T_PORTS,
1569: sizeof(sport) + sizeof(dport), M_DONTWAIT)) == NULL) {
1570: printf("udp4_espinudp: m_tag_get failed\n");
1.188 christos 1571: m_freem(m);
1572: return -1;
1.137 manu 1573: }
1.136 manu 1574: ((u_int16_t *)(tag + 1))[0] = sport;
1575: ((u_int16_t *)(tag + 1))[1] = dport;
1.188 christos 1576: m_tag_prepend(m, tag);
1.136 manu 1577:
1.190 christos 1578: #ifdef IPSEC
1.188 christos 1579: ipsec4_common_input(m, iphdrlen, IPPROTO_ESP);
1.147 christos 1580: #else
1.188 christos 1581: esp4_input(m, iphdrlen);
1.147 christos 1582: #endif
1.130 manu 1583:
1.185 liamjfoy 1584: /* We handled it, it shouldn't be handled by UDP */
1.188 christos 1585: *mp = NULL; /* avoid free by caller ... */
1.130 manu 1586: return 1;
1587: }
1588: #endif
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