Annotation of src/sys/netinet/udp_usrreq.c, Revision 1.196
1.196 ! rmind 1: /* $NetBSD: udp_usrreq.c,v 1.195 2014/05/18 14:46:16 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:
63: #include <sys/cdefs.h>
1.196 ! rmind 64: __KERNEL_RCSID(0, "$NetBSD: udp_usrreq.c,v 1.195 2014/05/18 14:46:16 rmind 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:
1.196 ! rmind 178: /*
! 179: * For send - really max datagram size; for receive - 40 1K datagrams.
! 180: */
! 181: static int udp_sendspace = 9216;
! 182: static int udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in));
! 183:
1.98 matt 184: #ifdef MBUFTRACE
1.150 dogcow 185: struct mowner udp_mowner = MOWNER_INIT("udp", "");
186: struct mowner udp_rx_mowner = MOWNER_INIT("udp", "rx");
187: struct mowner udp_tx_mowner = MOWNER_INIT("udp", "tx");
1.98 matt 188: #endif
189:
1.78 thorpej 190: #ifdef UDP_CSUM_COUNTERS
191: #include <sys/device.h>
192:
1.140 yamt 193: #if defined(INET)
1.78 thorpej 194: struct evcnt udp_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
195: NULL, "udp", "hwcsum bad");
196: struct evcnt udp_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
197: NULL, "udp", "hwcsum ok");
198: struct evcnt udp_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
199: NULL, "udp", "hwcsum data");
200: struct evcnt udp_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
201: NULL, "udp", "swcsum");
202:
1.120 matt 203: EVCNT_ATTACH_STATIC(udp_hwcsum_bad);
204: EVCNT_ATTACH_STATIC(udp_hwcsum_ok);
205: EVCNT_ATTACH_STATIC(udp_hwcsum_data);
206: EVCNT_ATTACH_STATIC(udp_swcsum);
1.140 yamt 207: #endif /* defined(INET) */
208:
209: #if defined(INET6)
210: struct evcnt udp6_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
211: NULL, "udp6", "hwcsum bad");
212: struct evcnt udp6_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
213: NULL, "udp6", "hwcsum ok");
214: struct evcnt udp6_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
215: NULL, "udp6", "hwcsum data");
216: struct evcnt udp6_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
217: NULL, "udp6", "swcsum");
218:
219: EVCNT_ATTACH_STATIC(udp6_hwcsum_bad);
220: EVCNT_ATTACH_STATIC(udp6_hwcsum_ok);
221: EVCNT_ATTACH_STATIC(udp6_hwcsum_data);
222: EVCNT_ATTACH_STATIC(udp6_swcsum);
223: #endif /* defined(INET6) */
224:
225: #define UDP_CSUM_COUNTER_INCR(ev) (ev)->ev_count++
1.120 matt 226:
1.78 thorpej 227: #else
228:
229: #define UDP_CSUM_COUNTER_INCR(ev) /* nothing */
230:
231: #endif /* UDP_CSUM_COUNTERS */
232:
1.179 pooka 233: static void sysctl_net_inet_udp_setup(struct sysctllog **);
234:
1.192 pooka 235: static int
236: do_udpinit(void)
1.1 cgd 237: {
1.18 mycroft 238:
1.35 mycroft 239: in_pcbinit(&udbtable, udbhashsize, udbhashsize);
1.193 pooka 240: udpstat_percpu = percpu_alloc(sizeof(uint64_t) * UDP_NSTATS);
1.78 thorpej 241:
1.98 matt 242: MOWNER_ATTACH(&udp_tx_mowner);
243: MOWNER_ATTACH(&udp_rx_mowner);
244: MOWNER_ATTACH(&udp_mowner);
1.166 thorpej 245:
1.192 pooka 246: return 0;
247: }
248:
249: void
250: udp_init_common(void)
251: {
252: static ONCE_DECL(doudpinit);
253:
254: RUN_ONCE(&doudpinit, do_udpinit);
255: }
256:
257: void
258: udp_init(void)
259: {
260:
261: sysctl_net_inet_udp_setup(NULL);
262:
263: udp_init_common();
1.1 cgd 264: }
265:
1.129 yamt 266: /*
267: * Checksum extended UDP header and data.
268: */
269:
270: int
271: udp_input_checksum(int af, struct mbuf *m, const struct udphdr *uh,
272: int iphlen, int len)
273: {
274:
275: switch (af) {
1.72 itojun 276: #ifdef INET
1.129 yamt 277: case AF_INET:
278: return udp4_input_checksum(m, uh, iphlen, len);
279: #endif
280: #ifdef INET6
281: case AF_INET6:
282: return udp6_input_checksum(m, uh, iphlen, len);
283: #endif
284: }
285: #ifdef DIAGNOSTIC
286: panic("udp_input_checksum: unknown af %d", af);
287: #endif
288: /* NOTREACHED */
289: return -1;
290: }
291:
292: #ifdef INET
293:
294: /*
295: * Checksum extended UDP header and data.
296: */
297:
298: static int
299: udp4_input_checksum(struct mbuf *m, const struct udphdr *uh,
300: int iphlen, int len)
301: {
302:
303: /*
304: * XXX it's better to record and check if this mbuf is
305: * already checked.
306: */
307:
308: if (uh->uh_sum == 0)
309: return 0;
310:
311: switch (m->m_pkthdr.csum_flags &
312: ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv4) |
313: M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) {
314: case M_CSUM_UDPv4|M_CSUM_TCP_UDP_BAD:
315: UDP_CSUM_COUNTER_INCR(&udp_hwcsum_bad);
316: goto badcsum;
317:
318: case M_CSUM_UDPv4|M_CSUM_DATA: {
319: u_int32_t hw_csum = m->m_pkthdr.csum_data;
320:
321: UDP_CSUM_COUNTER_INCR(&udp_hwcsum_data);
322: if (m->m_pkthdr.csum_flags & M_CSUM_NO_PSEUDOHDR) {
323: const struct ip *ip =
324: mtod(m, const struct ip *);
325:
326: hw_csum = in_cksum_phdr(ip->ip_src.s_addr,
327: ip->ip_dst.s_addr,
328: htons(hw_csum + len + IPPROTO_UDP));
329: }
330: if ((hw_csum ^ 0xffff) != 0)
331: goto badcsum;
332: break;
333: }
334:
335: case M_CSUM_UDPv4:
336: /* Checksum was okay. */
337: UDP_CSUM_COUNTER_INCR(&udp_hwcsum_ok);
338: break;
339:
340: default:
341: /*
342: * Need to compute it ourselves. Maybe skip checksum
343: * on loopback interfaces.
344: */
345: if (__predict_true(!(m->m_pkthdr.rcvif->if_flags &
346: IFF_LOOPBACK) ||
347: udp_do_loopback_cksum)) {
348: UDP_CSUM_COUNTER_INCR(&udp_swcsum);
349: if (in4_cksum(m, IPPROTO_UDP, iphlen, len) != 0)
350: goto badcsum;
351: }
352: break;
353: }
354:
355: return 0;
356:
357: badcsum:
1.166 thorpej 358: UDP_STATINC(UDP_STAT_BADSUM);
1.129 yamt 359: return -1;
360: }
361:
1.7 mycroft 362: void
1.27 christos 363: udp_input(struct mbuf *m, ...)
1.1 cgd 364: {
1.53 itojun 365: va_list ap;
366: struct sockaddr_in src, dst;
367: struct ip *ip;
368: struct udphdr *uh;
1.97 simonb 369: int iphlen;
1.53 itojun 370: int len;
371: int n;
1.96 itojun 372: u_int16_t ip_len;
1.53 itojun 373:
374: va_start(ap, m);
375: iphlen = va_arg(ap, int);
1.97 simonb 376: (void)va_arg(ap, int); /* ignore value, advance ap */
1.53 itojun 377: va_end(ap);
378:
1.98 matt 379: MCLAIM(m, &udp_rx_mowner);
1.166 thorpej 380: UDP_STATINC(UDP_STAT_IPACKETS);
1.53 itojun 381:
382: /*
383: * Get IP and UDP header together in first mbuf.
384: */
385: ip = mtod(m, struct ip *);
386: IP6_EXTHDR_GET(uh, struct udphdr *, m, iphlen, sizeof(struct udphdr));
387: if (uh == NULL) {
1.166 thorpej 388: UDP_STATINC(UDP_STAT_HDROPS);
1.53 itojun 389: return;
390: }
1.95 thorpej 391: KASSERT(UDP_HDR_ALIGNED_P(uh));
1.53 itojun 392:
1.57 itojun 393: /* destination port of 0 is illegal, based on RFC768. */
394: if (uh->uh_dport == 0)
395: goto bad;
396:
1.53 itojun 397: /*
398: * Make mbuf data length reflect UDP length.
399: * If not enough data to reflect UDP length, drop.
400: */
1.96 itojun 401: ip_len = ntohs(ip->ip_len);
1.53 itojun 402: len = ntohs((u_int16_t)uh->uh_ulen);
1.96 itojun 403: if (ip_len != iphlen + len) {
404: if (ip_len < iphlen + len || len < sizeof(struct udphdr)) {
1.166 thorpej 405: UDP_STATINC(UDP_STAT_BADLEN);
1.53 itojun 406: goto bad;
407: }
1.96 itojun 408: m_adj(m, iphlen + len - ip_len);
1.53 itojun 409: }
410:
411: /*
412: * Checksum extended UDP header and data.
413: */
1.129 yamt 414: if (udp4_input_checksum(m, uh, iphlen, len))
415: goto badcsum;
1.53 itojun 416:
417: /* construct source and dst sockaddrs. */
1.159 dyoung 418: sockaddr_in_init(&src, &ip->ip_src, uh->uh_sport);
419: sockaddr_in_init(&dst, &ip->ip_dst, uh->uh_dport);
1.53 itojun 420:
1.144 manu 421: if ((n = udp4_realinput(&src, &dst, &m, iphlen)) == -1) {
1.166 thorpej 422: UDP_STATINC(UDP_STAT_HDROPS);
1.144 manu 423: return;
424: }
1.188 christos 425: if (m == NULL) {
426: /*
427: * packet has been processed by ESP stuff -
428: * e.g. dropped NAT-T-keep-alive-packet ...
429: */
430: return;
431: }
432: ip = mtod(m, struct ip *);
1.53 itojun 433: #ifdef INET6
434: if (IN_MULTICAST(ip->ip_dst.s_addr) || n == 0) {
435: struct sockaddr_in6 src6, dst6;
436:
1.175 cegger 437: memset(&src6, 0, sizeof(src6));
1.53 itojun 438: src6.sin6_family = AF_INET6;
439: src6.sin6_len = sizeof(struct sockaddr_in6);
440: src6.sin6_addr.s6_addr[10] = src6.sin6_addr.s6_addr[11] = 0xff;
1.177 tsutsui 441: memcpy(&src6.sin6_addr.s6_addr[12], &ip->ip_src,
1.53 itojun 442: sizeof(ip->ip_src));
443: src6.sin6_port = uh->uh_sport;
1.175 cegger 444: memset(&dst6, 0, sizeof(dst6));
1.53 itojun 445: dst6.sin6_family = AF_INET6;
446: dst6.sin6_len = sizeof(struct sockaddr_in6);
447: dst6.sin6_addr.s6_addr[10] = dst6.sin6_addr.s6_addr[11] = 0xff;
1.177 tsutsui 448: memcpy(&dst6.sin6_addr.s6_addr[12], &ip->ip_dst,
1.53 itojun 449: sizeof(ip->ip_dst));
450: dst6.sin6_port = uh->uh_dport;
451:
452: n += udp6_realinput(AF_INET, &src6, &dst6, m, iphlen);
453: }
454: #endif
455:
456: if (n == 0) {
457: if (m->m_flags & (M_BCAST | M_MCAST)) {
1.166 thorpej 458: UDP_STATINC(UDP_STAT_NOPORTBCAST);
1.53 itojun 459: goto bad;
460: }
1.166 thorpej 461: UDP_STATINC(UDP_STAT_NOPORT);
1.64 ws 462: #ifdef IPKDB
1.53 itojun 463: if (checkipkdb(&ip->ip_src, uh->uh_sport, uh->uh_dport,
464: m, iphlen + sizeof(struct udphdr),
465: m->m_pkthdr.len - iphlen - sizeof(struct udphdr))) {
466: /*
467: * It was a debugger connect packet,
468: * just drop it now
469: */
470: goto bad;
471: }
472: #endif
473: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
474: m = NULL;
475: }
476:
477: bad:
478: if (m)
479: m_freem(m);
1.78 thorpej 480: return;
481:
482: badcsum:
483: m_freem(m);
1.53 itojun 484: }
1.72 itojun 485: #endif
1.53 itojun 486:
487: #ifdef INET6
1.129 yamt 488: static int
489: udp6_input_checksum(struct mbuf *m, const struct udphdr *uh, int off, int len)
490: {
491:
1.140 yamt 492: /*
493: * XXX it's better to record and check if this mbuf is
494: * already checked.
495: */
496:
1.129 yamt 497: if (__predict_false((m->m_flags & M_LOOP) && !udp_do_loopback_cksum)) {
498: goto good;
499: }
500: if (uh->uh_sum == 0) {
1.168 thorpej 501: UDP6_STATINC(UDP6_STAT_NOSUM);
1.129 yamt 502: goto bad;
503: }
1.140 yamt 504:
505: switch (m->m_pkthdr.csum_flags &
506: ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv6) |
507: M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) {
508: case M_CSUM_UDPv6|M_CSUM_TCP_UDP_BAD:
509: UDP_CSUM_COUNTER_INCR(&udp6_hwcsum_bad);
1.168 thorpej 510: UDP6_STATINC(UDP6_STAT_BADSUM);
1.129 yamt 511: goto bad;
1.140 yamt 512:
513: #if 0 /* notyet */
514: case M_CSUM_UDPv6|M_CSUM_DATA:
515: #endif
516:
517: case M_CSUM_UDPv6:
518: /* Checksum was okay. */
519: UDP_CSUM_COUNTER_INCR(&udp6_hwcsum_ok);
520: break;
521:
522: default:
523: /*
524: * Need to compute it ourselves. Maybe skip checksum
525: * on loopback interfaces.
526: */
527: UDP_CSUM_COUNTER_INCR(&udp6_swcsum);
528: if (in6_cksum(m, IPPROTO_UDP, off, len) != 0) {
1.168 thorpej 529: UDP6_STATINC(UDP6_STAT_BADSUM);
1.140 yamt 530: goto bad;
531: }
1.129 yamt 532: }
533:
534: good:
535: return 0;
536: bad:
537: return -1;
538: }
539:
1.53 itojun 540: int
1.154 yamt 541: udp6_input(struct mbuf **mp, int *offp, int proto)
1.53 itojun 542: {
543: struct mbuf *m = *mp;
544: int off = *offp;
545: struct sockaddr_in6 src, dst;
546: struct ip6_hdr *ip6;
547: struct udphdr *uh;
548: u_int32_t plen, ulen;
549:
1.76 itojun 550: ip6 = mtod(m, struct ip6_hdr *);
551:
1.53 itojun 552: #if defined(NFAITH) && 0 < NFAITH
1.76 itojun 553: if (faithprefix(&ip6->ip6_dst)) {
554: /* send icmp6 host unreach? */
555: m_freem(m);
556: return IPPROTO_DONE;
1.53 itojun 557: }
558: #endif
559:
1.168 thorpej 560: UDP6_STATINC(UDP6_STAT_IPACKETS);
1.53 itojun 561:
562: /* check for jumbogram is done in ip6_input. we can trust pkthdr.len */
563: plen = m->m_pkthdr.len - off;
564: IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(struct udphdr));
565: if (uh == NULL) {
1.167 thorpej 566: IP6_STATINC(IP6_STAT_TOOSHORT);
1.53 itojun 567: return IPPROTO_DONE;
568: }
1.95 thorpej 569: KASSERT(UDP_HDR_ALIGNED_P(uh));
1.53 itojun 570: ulen = ntohs((u_short)uh->uh_ulen);
1.69 itojun 571: /*
572: * RFC2675 section 4: jumbograms will have 0 in the UDP header field,
573: * iff payload length > 0xffff.
574: */
1.53 itojun 575: if (ulen == 0 && plen > 0xffff)
576: ulen = plen;
577:
578: if (plen != ulen) {
1.168 thorpej 579: UDP6_STATINC(UDP6_STAT_BADLEN);
1.54 itojun 580: goto bad;
581: }
582:
1.57 itojun 583: /* destination port of 0 is illegal, based on RFC768. */
584: if (uh->uh_dport == 0)
585: goto bad;
586:
1.54 itojun 587: /* Be proactive about malicious use of IPv4 mapped address */
588: if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
589: IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
590: /* XXX stat */
1.53 itojun 591: goto bad;
592: }
593:
594: /*
1.125 thorpej 595: * Checksum extended UDP header and data. Maybe skip checksum
596: * on loopback interfaces.
1.53 itojun 597: */
1.129 yamt 598: if (udp6_input_checksum(m, uh, off, ulen))
599: goto bad;
1.53 itojun 600:
601: /*
602: * Construct source and dst sockaddrs.
603: */
1.175 cegger 604: memset(&src, 0, sizeof(src));
1.53 itojun 605: src.sin6_family = AF_INET6;
606: src.sin6_len = sizeof(struct sockaddr_in6);
1.146 rpaulo 607: src.sin6_addr = ip6->ip6_src;
1.53 itojun 608: src.sin6_port = uh->uh_sport;
1.175 cegger 609: memset(&dst, 0, sizeof(dst));
1.53 itojun 610: dst.sin6_family = AF_INET6;
611: dst.sin6_len = sizeof(struct sockaddr_in6);
1.146 rpaulo 612: dst.sin6_addr = ip6->ip6_dst;
1.53 itojun 613: dst.sin6_port = uh->uh_dport;
614:
615: if (udp6_realinput(AF_INET6, &src, &dst, m, off) == 0) {
616: if (m->m_flags & M_MCAST) {
1.168 thorpej 617: UDP6_STATINC(UDP6_STAT_NOPORTMCAST);
1.53 itojun 618: goto bad;
619: }
1.168 thorpej 620: UDP6_STATINC(UDP6_STAT_NOPORT);
1.53 itojun 621: icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
622: m = NULL;
623: }
624:
625: bad:
626: if (m)
627: m_freem(m);
628: return IPPROTO_DONE;
629: }
630: #endif
631:
1.72 itojun 632: #ifdef INET
1.53 itojun 633: static void
1.119 matt 634: udp4_sendup(struct mbuf *m, int off /* offset of data portion */,
635: struct sockaddr *src, struct socket *so)
1.53 itojun 636: {
637: struct mbuf *opts = NULL;
638: struct mbuf *n;
639: struct inpcb *inp = NULL;
640:
641: if (!so)
642: return;
643: switch (so->so_proto->pr_domain->dom_family) {
644: case AF_INET:
645: inp = sotoinpcb(so);
646: break;
647: #ifdef INET6
648: case AF_INET6:
649: break;
650: #endif
651: default:
652: return;
653: }
654:
1.190 christos 655: #if defined(IPSEC)
1.53 itojun 656: /* check AH/ESP integrity. */
657: if (so != NULL && ipsec4_in_reject_so(m, so)) {
1.169 thorpej 658: IPSEC_STATINC(IPSEC_STAT_IN_POLVIO);
1.162 dyoung 659: if ((n = m_copypacket(m, M_DONTWAIT)) != NULL)
1.110 itojun 660: icmp_error(n, ICMP_UNREACH, ICMP_UNREACH_ADMIN_PROHIBIT,
661: 0, 0);
1.53 itojun 662: return;
663: }
664: #endif /*IPSEC*/
665:
1.162 dyoung 666: if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) {
1.53 itojun 667: if (inp && (inp->inp_flags & INP_CONTROLOPTS
1.174 christos 668: #ifdef SO_OTIMESTAMP
669: || so->so_options & SO_OTIMESTAMP
670: #endif
1.53 itojun 671: || so->so_options & SO_TIMESTAMP)) {
672: struct ip *ip = mtod(n, struct ip *);
673: ip_savecontrol(inp, &opts, ip, n);
674: }
675:
676: m_adj(n, off);
677: if (sbappendaddr(&so->so_rcv, src, n,
678: opts) == 0) {
679: m_freem(n);
680: if (opts)
681: m_freem(opts);
1.124 darrenr 682: so->so_rcv.sb_overflowed++;
1.166 thorpej 683: UDP_STATINC(UDP_STAT_FULLSOCK);
1.53 itojun 684: } else
685: sorwakeup(so);
686: }
687: }
1.72 itojun 688: #endif
1.53 itojun 689:
690: #ifdef INET6
691: static void
1.119 matt 692: udp6_sendup(struct mbuf *m, int off /* offset of data portion */,
693: struct sockaddr *src, struct socket *so)
1.53 itojun 694: {
695: struct mbuf *opts = NULL;
696: struct mbuf *n;
697: struct in6pcb *in6p = NULL;
698:
699: if (!so)
700: return;
701: if (so->so_proto->pr_domain->dom_family != AF_INET6)
702: return;
703: in6p = sotoin6pcb(so);
704:
1.190 christos 705: #if defined(IPSEC)
1.53 itojun 706: /* check AH/ESP integrity. */
707: if (so != NULL && ipsec6_in_reject_so(m, so)) {
1.169 thorpej 708: IPSEC6_STATINC(IPSEC_STAT_IN_POLVIO);
1.162 dyoung 709: if ((n = m_copypacket(m, M_DONTWAIT)) != NULL)
1.110 itojun 710: icmp6_error(n, ICMP6_DST_UNREACH,
711: ICMP6_DST_UNREACH_ADMIN, 0);
1.53 itojun 712: return;
713: }
714: #endif /*IPSEC*/
715:
1.162 dyoung 716: if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) {
1.53 itojun 717: if (in6p && (in6p->in6p_flags & IN6P_CONTROLOPTS
1.174 christos 718: #ifdef SO_OTIMESTAMP
719: || in6p->in6p_socket->so_options & SO_OTIMESTAMP
720: #endif
721: || in6p->in6p_socket->so_options & SO_TIMESTAMP)) {
1.53 itojun 722: struct ip6_hdr *ip6 = mtod(n, struct ip6_hdr *);
723: ip6_savecontrol(in6p, &opts, ip6, n);
724: }
725:
726: m_adj(n, off);
727: if (sbappendaddr(&so->so_rcv, src, n, opts) == 0) {
728: m_freem(n);
729: if (opts)
730: m_freem(opts);
1.124 darrenr 731: so->so_rcv.sb_overflowed++;
1.168 thorpej 732: UDP6_STATINC(UDP6_STAT_FULLSOCK);
1.53 itojun 733: } else
734: sorwakeup(so);
735: }
736: }
737: #endif
738:
1.72 itojun 739: #ifdef INET
1.53 itojun 740: static int
1.119 matt 741: udp4_realinput(struct sockaddr_in *src, struct sockaddr_in *dst,
1.144 manu 742: struct mbuf **mp, int off /* offset of udphdr */)
1.53 itojun 743: {
744: u_int16_t *sport, *dport;
745: int rcvcnt;
746: struct in_addr *src4, *dst4;
1.109 itojun 747: struct inpcb_hdr *inph;
1.53 itojun 748: struct inpcb *inp;
1.144 manu 749: struct mbuf *m = *mp;
1.53 itojun 750:
751: rcvcnt = 0;
752: off += sizeof(struct udphdr); /* now, offset of payload */
753:
754: if (src->sin_family != AF_INET || dst->sin_family != AF_INET)
755: goto bad;
756:
757: src4 = &src->sin_addr;
758: sport = &src->sin_port;
759: dst4 = &dst->sin_addr;
760: dport = &dst->sin_port;
761:
1.73 itojun 762: if (IN_MULTICAST(dst4->s_addr) ||
1.53 itojun 763: in_broadcast(*dst4, m->m_pkthdr.rcvif)) {
764: /*
765: * Deliver a multicast or broadcast datagram to *all* sockets
766: * for which the local and remote addresses and ports match
767: * those of the incoming datagram. This allows more than
768: * one process to receive multi/broadcasts on the same port.
769: * (This really ought to be done for unicast datagrams as
770: * well, but that would cause problems with existing
771: * applications that open both address-specific sockets and
772: * a wildcard socket listening to the same port -- they would
773: * end up receiving duplicates of every unicast datagram.
774: * Those applications open the multiple sockets to overcome an
775: * inadequacy of the UDP socket interface, but for backwards
776: * compatibility we avoid the problem here rather than
777: * fixing the interface. Maybe 4.5BSD will remedy this?)
778: */
779:
780: /*
1.92 itojun 781: * KAME note: traditionally we dropped udpiphdr from mbuf here.
1.71 itojun 782: * we need udpiphdr for IPsec processing so we do that later.
1.53 itojun 783: */
784: /*
785: * Locate pcb(s) for datagram.
786: */
1.191 christos 787: TAILQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) {
1.109 itojun 788: inp = (struct inpcb *)inph;
789: if (inp->inp_af != AF_INET)
790: continue;
791:
1.53 itojun 792: if (inp->inp_lport != *dport)
793: continue;
794: if (!in_nullhost(inp->inp_laddr)) {
795: if (!in_hosteq(inp->inp_laddr, *dst4))
796: continue;
797: }
798: if (!in_nullhost(inp->inp_faddr)) {
799: if (!in_hosteq(inp->inp_faddr, *src4) ||
800: inp->inp_fport != *sport)
801: continue;
802: }
803:
804: udp4_sendup(m, off, (struct sockaddr *)src,
805: inp->inp_socket);
806: rcvcnt++;
807:
808: /*
809: * Don't look for additional matches if this one does
810: * not have either the SO_REUSEPORT or SO_REUSEADDR
811: * socket options set. This heuristic avoids searching
812: * through all pcbs in the common case of a non-shared
813: * port. It assumes that an application will never
814: * clear these options after setting them.
815: */
816: if ((inp->inp_socket->so_options &
817: (SO_REUSEPORT|SO_REUSEADDR)) == 0)
818: break;
819: }
820: } else {
821: /*
822: * Locate pcb for datagram.
823: */
1.180 dyoung 824: inp = in_pcblookup_connect(&udbtable, *src4, *sport, *dst4,
825: *dport, 0);
1.53 itojun 826: if (inp == 0) {
1.166 thorpej 827: UDP_STATINC(UDP_STAT_PCBHASHMISS);
1.53 itojun 828: inp = in_pcblookup_bind(&udbtable, *dst4, *dport);
1.82 itojun 829: if (inp == 0)
1.53 itojun 830: return rcvcnt;
831: }
832:
1.190 christos 833: #ifdef IPSEC
1.130 manu 834: /* Handle ESP over UDP */
835: if (inp->inp_flags & INP_ESPINUDP_ALL) {
836: struct sockaddr *sa = (struct sockaddr *)src;
837:
1.144 manu 838: switch(udp4_espinudp(mp, off, sa, inp->inp_socket)) {
839: case -1: /* Error, m was freeed */
840: rcvcnt = -1;
841: goto bad;
842: break;
843:
844: case 1: /* ESP over UDP */
1.130 manu 845: rcvcnt++;
846: goto bad;
1.144 manu 847: break;
848:
849: case 0: /* plain UDP */
850: default: /* Unexpected */
851: /*
852: * Normal UDP processing will take place
853: * m may have changed.
854: */
855: m = *mp;
856: break;
1.130 manu 857: }
858: }
1.189 christos 859: #endif
1.130 manu 860:
1.178 minskim 861: /*
862: * Check the minimum TTL for socket.
863: */
864: if (mtod(m, struct ip *)->ip_ttl < inp->inp_ip_minttl)
865: goto bad;
866:
1.53 itojun 867: udp4_sendup(m, off, (struct sockaddr *)src, inp->inp_socket);
868: rcvcnt++;
869: }
870:
871: bad:
872: return rcvcnt;
873: }
1.72 itojun 874: #endif
1.53 itojun 875:
876: #ifdef INET6
877: static int
1.119 matt 878: udp6_realinput(int af, struct sockaddr_in6 *src, struct sockaddr_in6 *dst,
879: struct mbuf *m, int off)
1.53 itojun 880: {
1.79 itojun 881: u_int16_t sport, dport;
1.53 itojun 882: int rcvcnt;
1.146 rpaulo 883: struct in6_addr src6, *dst6;
1.79 itojun 884: const struct in_addr *dst4;
1.109 itojun 885: struct inpcb_hdr *inph;
1.53 itojun 886: struct in6pcb *in6p;
887:
888: rcvcnt = 0;
889: off += sizeof(struct udphdr); /* now, offset of payload */
890:
891: if (af != AF_INET && af != AF_INET6)
892: goto bad;
893: if (src->sin6_family != AF_INET6 || dst->sin6_family != AF_INET6)
894: goto bad;
895:
1.146 rpaulo 896: src6 = src->sin6_addr;
897: if (sa6_recoverscope(src) != 0) {
898: /* XXX: should be impossible. */
899: goto bad;
900: }
1.79 itojun 901: sport = src->sin6_port;
1.146 rpaulo 902:
1.79 itojun 903: dport = dst->sin6_port;
1.88 itojun 904: dst4 = (struct in_addr *)&dst->sin6_addr.s6_addr[12];
1.146 rpaulo 905: dst6 = &dst->sin6_addr;
1.53 itojun 906:
1.146 rpaulo 907: if (IN6_IS_ADDR_MULTICAST(dst6) ||
1.79 itojun 908: (af == AF_INET && IN_MULTICAST(dst4->s_addr))) {
1.53 itojun 909: /*
910: * Deliver a multicast or broadcast datagram to *all* sockets
911: * for which the local and remote addresses and ports match
912: * those of the incoming datagram. This allows more than
913: * one process to receive multi/broadcasts on the same port.
914: * (This really ought to be done for unicast datagrams as
915: * well, but that would cause problems with existing
916: * applications that open both address-specific sockets and
917: * a wildcard socket listening to the same port -- they would
918: * end up receiving duplicates of every unicast datagram.
919: * Those applications open the multiple sockets to overcome an
920: * inadequacy of the UDP socket interface, but for backwards
921: * compatibility we avoid the problem here rather than
922: * fixing the interface. Maybe 4.5BSD will remedy this?)
923: */
924:
925: /*
1.92 itojun 926: * KAME note: traditionally we dropped udpiphdr from mbuf here.
1.71 itojun 927: * we need udpiphdr for IPsec processing so we do that later.
1.53 itojun 928: */
929: /*
930: * Locate pcb(s) for datagram.
931: */
1.191 christos 932: TAILQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) {
1.109 itojun 933: in6p = (struct in6pcb *)inph;
934: if (in6p->in6p_af != AF_INET6)
935: continue;
936:
1.79 itojun 937: if (in6p->in6p_lport != dport)
1.53 itojun 938: continue;
939: if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
1.146 rpaulo 940: if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr,
941: dst6))
1.53 itojun 942: continue;
1.92 itojun 943: } else {
1.146 rpaulo 944: if (IN6_IS_ADDR_V4MAPPED(dst6) &&
1.85 itojun 945: (in6p->in6p_flags & IN6P_IPV6_V6ONLY))
1.55 itojun 946: continue;
947: }
1.53 itojun 948: if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
1.79 itojun 949: if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr,
950: &src6) || in6p->in6p_fport != sport)
1.53 itojun 951: continue;
1.92 itojun 952: } else {
1.79 itojun 953: if (IN6_IS_ADDR_V4MAPPED(&src6) &&
1.85 itojun 954: (in6p->in6p_flags & IN6P_IPV6_V6ONLY))
1.55 itojun 955: continue;
956: }
1.53 itojun 957:
958: udp6_sendup(m, off, (struct sockaddr *)src,
959: in6p->in6p_socket);
960: rcvcnt++;
961:
962: /*
963: * Don't look for additional matches if this one does
964: * not have either the SO_REUSEPORT or SO_REUSEADDR
965: * socket options set. This heuristic avoids searching
966: * through all pcbs in the common case of a non-shared
967: * port. It assumes that an application will never
968: * clear these options after setting them.
969: */
970: if ((in6p->in6p_socket->so_options &
971: (SO_REUSEPORT|SO_REUSEADDR)) == 0)
972: break;
973: }
974: } else {
975: /*
976: * Locate pcb for datagram.
977: */
1.146 rpaulo 978: in6p = in6_pcblookup_connect(&udbtable, &src6, sport, dst6,
1.180 dyoung 979: dport, 0, 0);
1.53 itojun 980: if (in6p == 0) {
1.166 thorpej 981: UDP_STATINC(UDP_STAT_PCBHASHMISS);
1.146 rpaulo 982: in6p = in6_pcblookup_bind(&udbtable, dst6, dport, 0);
1.82 itojun 983: if (in6p == 0)
1.53 itojun 984: return rcvcnt;
985: }
986:
987: udp6_sendup(m, off, (struct sockaddr *)src, in6p->in6p_socket);
988: rcvcnt++;
989: }
990:
991: bad:
992: return rcvcnt;
993: }
994: #endif
1.1 cgd 995:
1.72 itojun 996: #ifdef INET
1.1 cgd 997: /*
998: * Notify a udp user of an asynchronous error;
999: * just wake up so that he can collect error status.
1000: */
1.7 mycroft 1001: static void
1.119 matt 1002: udp_notify(struct inpcb *inp, int errno)
1.1 cgd 1003: {
1004: inp->inp_socket->so_error = errno;
1005: sorwakeup(inp->inp_socket);
1006: sowwakeup(inp->inp_socket);
1007: }
1008:
1.27 christos 1009: void *
1.157 dyoung 1010: udp_ctlinput(int cmd, const struct sockaddr *sa, void *v)
1.1 cgd 1011: {
1.66 augustss 1012: struct ip *ip = v;
1013: struct udphdr *uh;
1.119 matt 1014: void (*notify)(struct inpcb *, int) = udp_notify;
1.21 mycroft 1015: int errno;
1.1 cgd 1016:
1.53 itojun 1017: if (sa->sa_family != AF_INET
1018: || sa->sa_len != sizeof(struct sockaddr_in))
1.51 itojun 1019: return NULL;
1.20 mycroft 1020: if ((unsigned)cmd >= PRC_NCMDS)
1.27 christos 1021: return NULL;
1.20 mycroft 1022: errno = inetctlerrmap[cmd];
1.18 mycroft 1023: if (PRC_IS_REDIRECT(cmd))
1.19 mycroft 1024: notify = in_rtchange, ip = 0;
1.18 mycroft 1025: else if (cmd == PRC_HOSTDEAD)
1.19 mycroft 1026: ip = 0;
1.23 cgd 1027: else if (errno == 0)
1.27 christos 1028: return NULL;
1.19 mycroft 1029: if (ip) {
1.158 christos 1030: uh = (struct udphdr *)((char *)ip + (ip->ip_hl << 2));
1.157 dyoung 1031: in_pcbnotify(&udbtable, satocsin(sa)->sin_addr, uh->uh_dport,
1.34 mycroft 1032: ip->ip_src, uh->uh_sport, errno, notify);
1.53 itojun 1033:
1034: /* XXX mapped address case */
1.19 mycroft 1035: } else
1.157 dyoung 1036: in_pcbnotifyall(&udbtable, satocsin(sa)->sin_addr, errno,
1.34 mycroft 1037: notify);
1.27 christos 1038: return NULL;
1.1 cgd 1039: }
1040:
1.7 mycroft 1041: int
1.173 plunky 1042: udp_ctloutput(int op, struct socket *so, struct sockopt *sopt)
1.130 manu 1043: {
1044: int s;
1045: int error = 0;
1046: struct inpcb *inp;
1047: int family;
1.173 plunky 1048: int optval;
1.130 manu 1049:
1050: family = so->so_proto->pr_domain->dom_family;
1051:
1052: s = splsoftnet();
1053: switch (family) {
1054: #ifdef INET
1055: case PF_INET:
1.173 plunky 1056: if (sopt->sopt_level != IPPROTO_UDP) {
1057: error = ip_ctloutput(op, so, sopt);
1.130 manu 1058: goto end;
1059: }
1060: break;
1061: #endif
1062: #ifdef INET6
1063: case PF_INET6:
1.173 plunky 1064: if (sopt->sopt_level != IPPROTO_UDP) {
1065: error = ip6_ctloutput(op, so, sopt);
1.130 manu 1066: goto end;
1067: }
1068: break;
1069: #endif
1070: default:
1071: error = EAFNOSUPPORT;
1072: goto end;
1073: }
1074:
1075:
1076: switch (op) {
1077: case PRCO_SETOPT:
1078: inp = sotoinpcb(so);
1079:
1.173 plunky 1080: switch (sopt->sopt_name) {
1.130 manu 1081: case UDP_ENCAP:
1.173 plunky 1082: error = sockopt_getint(sopt, &optval);
1083: if (error)
1.153 yamt 1084: break;
1.131 perry 1085:
1.173 plunky 1086: switch(optval) {
1.130 manu 1087: case 0:
1088: inp->inp_flags &= ~INP_ESPINUDP_ALL;
1089: break;
1090:
1091: case UDP_ENCAP_ESPINUDP:
1092: inp->inp_flags &= ~INP_ESPINUDP_ALL;
1093: inp->inp_flags |= INP_ESPINUDP;
1094: break;
1.131 perry 1095:
1.130 manu 1096: case UDP_ENCAP_ESPINUDP_NON_IKE:
1097: inp->inp_flags &= ~INP_ESPINUDP_ALL;
1098: inp->inp_flags |= INP_ESPINUDP_NON_IKE;
1099: break;
1100: default:
1101: error = EINVAL;
1102: break;
1103: }
1104: break;
1.183 christos 1105:
1.130 manu 1106: default:
1107: error = ENOPROTOOPT;
1108: break;
1109: }
1110: break;
1111:
1112: default:
1113: error = EINVAL;
1114: break;
1.131 perry 1115: }
1116:
1.130 manu 1117: end:
1118: splx(s);
1119: return error;
1120: }
1.131 perry 1121:
1.130 manu 1122:
1123: int
1.27 christos 1124: udp_output(struct mbuf *m, ...)
1125: {
1.66 augustss 1126: struct inpcb *inp;
1127: struct udpiphdr *ui;
1.125 thorpej 1128: struct route *ro;
1.66 augustss 1129: int len = m->m_pkthdr.len;
1.31 mycroft 1130: int error = 0;
1.27 christos 1131: va_list ap;
1132:
1.98 matt 1133: MCLAIM(m, &udp_tx_mowner);
1.27 christos 1134: va_start(ap, m);
1135: inp = va_arg(ap, struct inpcb *);
1136: va_end(ap);
1.1 cgd 1137:
1138: /*
1139: * Calculate data length and get a mbuf
1140: * for UDP and IP headers.
1141: */
1.13 mycroft 1142: M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT);
1143: if (m == 0) {
1144: error = ENOBUFS;
1.39 thorpej 1145: goto release;
1146: }
1147:
1148: /*
1149: * Compute the packet length of the IP header, and
1150: * punt if the length looks bogus.
1151: */
1.96 itojun 1152: if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) {
1.39 thorpej 1153: error = EMSGSIZE;
1.13 mycroft 1154: goto release;
1155: }
1.1 cgd 1156:
1157: /*
1158: * Fill in mbuf with extended UDP header
1159: * and addresses and length put into network format.
1160: */
1161: ui = mtod(m, struct udpiphdr *);
1162: ui->ui_pr = IPPROTO_UDP;
1163: ui->ui_src = inp->inp_laddr;
1164: ui->ui_dst = inp->inp_faddr;
1165: ui->ui_sport = inp->inp_lport;
1166: ui->ui_dport = inp->inp_fport;
1.78 thorpej 1167: ui->ui_ulen = htons((u_int16_t)len + sizeof(struct udphdr));
1.1 cgd 1168:
1.125 thorpej 1169: ro = &inp->inp_route;
1170:
1.1 cgd 1171: /*
1.78 thorpej 1172: * Set up checksum and output datagram.
1.1 cgd 1173: */
1174: if (udpcksum) {
1.78 thorpej 1175: /*
1176: * XXX Cache pseudo-header checksum part for
1177: * XXX "connected" UDP sockets.
1178: */
1179: ui->ui_sum = in_cksum_phdr(ui->ui_src.s_addr,
1180: ui->ui_dst.s_addr, htons((u_int16_t)len +
1181: sizeof(struct udphdr) + IPPROTO_UDP));
1.135 yamt 1182: m->m_pkthdr.csum_flags = M_CSUM_UDPv4;
1.78 thorpej 1183: m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
1184: } else
1185: ui->ui_sum = 0;
1.96 itojun 1186: ((struct ip *)ui)->ip_len = htons(sizeof (struct udpiphdr) + len);
1.1 cgd 1187: ((struct ip *)ui)->ip_ttl = inp->inp_ip.ip_ttl; /* XXX */
1188: ((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; /* XXX */
1.166 thorpej 1189: UDP_STATINC(UDP_STAT_OPACKETS);
1.48 itojun 1190:
1.125 thorpej 1191: return (ip_output(m, inp->inp_options, ro,
1.12 mycroft 1192: inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST),
1.107 itojun 1193: inp->inp_moptions, inp->inp_socket));
1.1 cgd 1194:
1195: release:
1196: m_freem(m);
1197: return (error);
1198: }
1199:
1.196 ! rmind 1200: static int
! 1201: udp_attach(struct socket *so, int proto)
! 1202: {
! 1203: struct inpcb *inp;
! 1204: int error;
! 1205:
! 1206: KASSERT(sotoinpcb(so) == NULL);
! 1207:
! 1208: /* Assign the lock (must happen even if we will error out). */
! 1209: sosetlock(so);
! 1210:
! 1211: #ifdef MBUFTRACE
! 1212: so->so_mowner = &udp_mowner;
! 1213: so->so_rcv.sb_mowner = &udp_rx_mowner;
! 1214: so->so_snd.sb_mowner = &udp_tx_mowner;
! 1215: #endif
! 1216: if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
! 1217: error = soreserve(so, udp_sendspace, udp_recvspace);
! 1218: if (error) {
! 1219: return error;
! 1220: }
! 1221: }
! 1222:
! 1223: error = in_pcballoc(so, &udbtable);
! 1224: if (error) {
! 1225: return error;
! 1226: }
! 1227: inp = sotoinpcb(so);
! 1228: inp->inp_ip.ip_ttl = ip_defttl;
! 1229: KASSERT(solocked(so));
! 1230:
! 1231: return error;
! 1232: }
! 1233:
! 1234: static void
! 1235: udp_detach(struct socket *so)
! 1236: {
! 1237: struct inpcb *inp;
! 1238:
! 1239: KASSERT(solocked(so));
! 1240: inp = sotoinpcb(so);
! 1241: KASSERT(inp != NULL);
! 1242: in_pcbdetach(inp);
! 1243: }
1.1 cgd 1244:
1.195 rmind 1245: static int
1.119 matt 1246: udp_usrreq(struct socket *so, int req, struct mbuf *m, struct mbuf *nam,
1.195 rmind 1247: struct mbuf *control, struct lwp *l)
1.1 cgd 1248: {
1.66 augustss 1249: struct inpcb *inp;
1.196 ! rmind 1250: int s, error = 0;
1.1 cgd 1251:
1.196 ! rmind 1252: KASSERT(req != PRU_ATTACH);
! 1253: KASSERT(req != PRU_DETACH);
1.59 thorpej 1254:
1.196 ! rmind 1255: if (req == PRU_CONTROL) {
! 1256: return in_control(so, (long)m, (void *)nam,
! 1257: (struct ifnet *)control, l);
! 1258: }
1.149 tls 1259: s = splsoftnet();
1.60 thorpej 1260: if (req == PRU_PURGEIF) {
1.170 ad 1261: mutex_enter(softnet_lock);
1.80 itojun 1262: in_pcbpurgeif0(&udbtable, (struct ifnet *)control);
1.60 thorpej 1263: in_purgeif((struct ifnet *)control);
1264: in_pcbpurgeif(&udbtable, (struct ifnet *)control);
1.170 ad 1265: mutex_exit(softnet_lock);
1.149 tls 1266: splx(s);
1.196 ! rmind 1267: return 0;
1.59 thorpej 1268: }
1.31 mycroft 1269:
1.196 ! rmind 1270: KASSERT(solocked(so));
1.31 mycroft 1271: inp = sotoinpcb(so);
1.196 ! rmind 1272:
! 1273: KASSERT(!control || (req == PRU_SEND || req == PRU_SENDOOB));
! 1274: if (inp == NULL) {
! 1275: splx(s);
! 1276: return EINVAL;
1.31 mycroft 1277: }
1278:
1.1 cgd 1279: /*
1280: * Note: need to block udp_input while changing
1281: * the udp pcb queue and/or pcb addresses.
1282: */
1283: switch (req) {
1284: case PRU_BIND:
1.148 ad 1285: error = in_pcbbind(inp, nam, l);
1.1 cgd 1286: break;
1287:
1288: case PRU_LISTEN:
1289: error = EOPNOTSUPP;
1290: break;
1291:
1292: case PRU_CONNECT:
1.148 ad 1293: error = in_pcbconnect(inp, nam, l);
1.31 mycroft 1294: if (error)
1.1 cgd 1295: break;
1.31 mycroft 1296: soisconnected(so);
1.1 cgd 1297: break;
1298:
1299: case PRU_CONNECT2:
1300: error = EOPNOTSUPP;
1301: break;
1302:
1303: case PRU_DISCONNECT:
1.31 mycroft 1304: /*soisdisconnected(so);*/
1305: so->so_state &= ~SS_ISCONNECTED; /* XXX */
1.1 cgd 1306: in_pcbdisconnect(inp);
1.34 mycroft 1307: inp->inp_laddr = zeroin_addr; /* XXX */
1.35 mycroft 1308: in_pcbstate(inp, INP_BOUND); /* XXX */
1.1 cgd 1309: break;
1310:
1311: case PRU_SHUTDOWN:
1312: socantsendmore(so);
1313: break;
1314:
1.31 mycroft 1315: case PRU_RCVD:
1316: error = EOPNOTSUPP;
1.1 cgd 1317: break;
1318:
1.31 mycroft 1319: case PRU_SEND:
1.32 mycroft 1320: if (control && control->m_len) {
1321: m_freem(control);
1322: m_freem(m);
1323: error = EINVAL;
1324: break;
1325: }
1.31 mycroft 1326: {
1.35 mycroft 1327: struct in_addr laddr; /* XXX */
1.1 cgd 1328:
1.181 mrg 1329: memset(&laddr, 0, sizeof laddr);
1.31 mycroft 1330: if (nam) {
1.35 mycroft 1331: laddr = inp->inp_laddr; /* XXX */
1.31 mycroft 1332: if ((so->so_state & SS_ISCONNECTED) != 0) {
1333: error = EISCONN;
1.32 mycroft 1334: goto die;
1.31 mycroft 1335: }
1.148 ad 1336: error = in_pcbconnect(inp, nam, l);
1.100 matt 1337: if (error)
1338: goto die;
1.31 mycroft 1339: } else {
1340: if ((so->so_state & SS_ISCONNECTED) == 0) {
1341: error = ENOTCONN;
1.32 mycroft 1342: goto die;
1.31 mycroft 1343: }
1344: }
1.33 mycroft 1345: error = udp_output(m, inp);
1.100 matt 1346: m = NULL;
1.31 mycroft 1347: if (nam) {
1348: in_pcbdisconnect(inp);
1.35 mycroft 1349: inp->inp_laddr = laddr; /* XXX */
1350: in_pcbstate(inp, INP_BOUND); /* XXX */
1.31 mycroft 1351: }
1.100 matt 1352: die:
1353: if (m)
1354: m_freem(m);
1.31 mycroft 1355: }
1.1 cgd 1356: break;
1357:
1358: case PRU_SENSE:
1359: /*
1360: * stat: don't bother with a blocksize.
1361: */
1.31 mycroft 1362: splx(s);
1.1 cgd 1363: return (0);
1364:
1.31 mycroft 1365: case PRU_RCVOOB:
1366: error = EOPNOTSUPP;
1367: break;
1368:
1.1 cgd 1369: case PRU_SENDOOB:
1.32 mycroft 1370: m_freem(control);
1.31 mycroft 1371: m_freem(m);
1.1 cgd 1372: error = EOPNOTSUPP;
1373: break;
1374:
1.31 mycroft 1375: case PRU_SOCKADDR:
1376: in_setsockaddr(inp, nam);
1377: break;
1378:
1379: case PRU_PEERADDR:
1380: in_setpeeraddr(inp, nam);
1381: break;
1.1 cgd 1382:
1383: default:
1384: panic("udp_usrreq");
1385: }
1.196 ! rmind 1386: splx(s);
1.1 cgd 1387:
1.196 ! rmind 1388: return error;
1.13 mycroft 1389: }
1390:
1.166 thorpej 1391: static int
1392: sysctl_net_inet_udp_stats(SYSCTLFN_ARGS)
1393: {
1394:
1.172 thorpej 1395: return (NETSTAT_SYSCTL(udpstat_percpu, UDP_NSTATS));
1.166 thorpej 1396: }
1397:
1.13 mycroft 1398: /*
1399: * Sysctl for udp variables.
1400: */
1.179 pooka 1401: static void
1402: sysctl_net_inet_udp_setup(struct sysctllog **clog)
1.13 mycroft 1403: {
1.194 pooka 1404:
1.116 atatat 1405: sysctl_createv(clog, 0, NULL, NULL,
1406: CTLFLAG_PERMANENT,
1.114 atatat 1407: CTLTYPE_NODE, "inet", NULL,
1408: NULL, 0, NULL, 0,
1409: CTL_NET, PF_INET, CTL_EOL);
1.116 atatat 1410: sysctl_createv(clog, 0, NULL, NULL,
1411: CTLFLAG_PERMANENT,
1.122 atatat 1412: CTLTYPE_NODE, "udp",
1413: SYSCTL_DESCR("UDPv4 related settings"),
1.114 atatat 1414: NULL, 0, NULL, 0,
1415: CTL_NET, PF_INET, IPPROTO_UDP, CTL_EOL);
1416:
1.116 atatat 1417: sysctl_createv(clog, 0, NULL, NULL,
1418: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122 atatat 1419: CTLTYPE_INT, "checksum",
1.123 heas 1420: SYSCTL_DESCR("Compute UDP checksums"),
1.114 atatat 1421: NULL, 0, &udpcksum, 0,
1422: CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_CHECKSUM,
1423: CTL_EOL);
1.116 atatat 1424: sysctl_createv(clog, 0, NULL, NULL,
1425: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122 atatat 1426: CTLTYPE_INT, "sendspace",
1427: SYSCTL_DESCR("Default UDP send buffer size"),
1.114 atatat 1428: NULL, 0, &udp_sendspace, 0,
1429: CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_SENDSPACE,
1430: CTL_EOL);
1.116 atatat 1431: sysctl_createv(clog, 0, NULL, NULL,
1432: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122 atatat 1433: CTLTYPE_INT, "recvspace",
1434: SYSCTL_DESCR("Default UDP receive buffer size"),
1.114 atatat 1435: NULL, 0, &udp_recvspace, 0,
1436: CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_RECVSPACE,
1437: CTL_EOL);
1.125 thorpej 1438: sysctl_createv(clog, 0, NULL, NULL,
1439: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1440: CTLTYPE_INT, "do_loopback_cksum",
1441: SYSCTL_DESCR("Perform UDP checksum on loopback"),
1442: NULL, 0, &udp_do_loopback_cksum, 0,
1443: CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_LOOPBACKCKSUM,
1444: CTL_EOL);
1.132 atatat 1445: sysctl_createv(clog, 0, NULL, NULL,
1446: CTLFLAG_PERMANENT,
1.134 atatat 1447: CTLTYPE_STRUCT, "pcblist",
1.132 atatat 1448: SYSCTL_DESCR("UDP protocol control block list"),
1449: sysctl_inpcblist, 0, &udbtable, 0,
1450: CTL_NET, PF_INET, IPPROTO_UDP, CTL_CREATE,
1451: CTL_EOL);
1.139 elad 1452: sysctl_createv(clog, 0, NULL, NULL,
1453: CTLFLAG_PERMANENT,
1454: CTLTYPE_STRUCT, "stats",
1455: SYSCTL_DESCR("UDP statistics"),
1.166 thorpej 1456: sysctl_net_inet_udp_stats, 0, NULL, 0,
1.139 elad 1457: CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_STATS,
1458: CTL_EOL);
1.1 cgd 1459: }
1.72 itojun 1460: #endif
1.130 manu 1461:
1.166 thorpej 1462: void
1463: udp_statinc(u_int stat)
1464: {
1465:
1466: KASSERT(stat < UDP_NSTATS);
1467: UDP_STATINC(stat);
1468: }
1469:
1.190 christos 1470: #if defined(INET) && defined(IPSEC)
1.130 manu 1471: /*
1472: * Returns:
1473: * 1 if the packet was processed
1474: * 0 if normal UDP processing should take place
1.144 manu 1475: * -1 if an error occurent and m was freed
1.130 manu 1476: */
1477: static int
1.154 yamt 1478: udp4_espinudp(struct mbuf **mp, int off, struct sockaddr *src,
1.151 christos 1479: struct socket *so)
1.130 manu 1480: {
1481: size_t len;
1.158 christos 1482: void *data;
1.130 manu 1483: struct inpcb *inp;
1484: size_t skip = 0;
1485: size_t minlen;
1486: size_t iphdrlen;
1487: struct ip *ip;
1.136 manu 1488: struct m_tag *tag;
1489: struct udphdr *udphdr;
1490: u_int16_t sport, dport;
1.144 manu 1491: struct mbuf *m = *mp;
1.130 manu 1492:
1.131 perry 1493: /*
1.130 manu 1494: * Collapse the mbuf chain if the first mbuf is too short
1495: * The longest case is: UDP + non ESP marker + ESP
1496: */
1497: minlen = off + sizeof(u_int64_t) + sizeof(struct esp);
1498: if (minlen > m->m_pkthdr.len)
1499: minlen = m->m_pkthdr.len;
1500:
1501: if (m->m_len < minlen) {
1.144 manu 1502: if ((*mp = m_pullup(m, minlen)) == NULL) {
1.130 manu 1503: printf("udp4_espinudp: m_pullup failed\n");
1.144 manu 1504: return -1;
1.130 manu 1505: }
1.144 manu 1506: m = *mp;
1.130 manu 1507: }
1508:
1.131 perry 1509: len = m->m_len - off;
1.158 christos 1510: data = mtod(m, char *) + off;
1.130 manu 1511: inp = sotoinpcb(so);
1512:
1513: /* Ignore keepalive packets */
1.158 christos 1514: if ((len == 1) && (*(unsigned char *)data == 0xff)) {
1.188 christos 1515: m_free(m);
1516: *mp = NULL; /* avoid any further processiong by caller ... */
1.130 manu 1517: return 1;
1518: }
1519:
1.131 perry 1520: /*
1521: * Check that the payload is long enough to hold
1.130 manu 1522: * an ESP header and compute the length of encapsulation
1.131 perry 1523: * header to remove
1.130 manu 1524: */
1525: if (inp->inp_flags & INP_ESPINUDP) {
1526: u_int32_t *st = (u_int32_t *)data;
1527:
1528: if ((len <= sizeof(struct esp)) || (*st == 0))
1529: return 0; /* Normal UDP processing */
1530:
1531: skip = sizeof(struct udphdr);
1532: }
1533:
1534: if (inp->inp_flags & INP_ESPINUDP_NON_IKE) {
1.142 kleink 1535: u_int32_t *st = (u_int32_t *)data;
1.130 manu 1536:
1537: if ((len <= sizeof(u_int64_t) + sizeof(struct esp))
1.142 kleink 1538: || ((st[0] | st[1]) != 0))
1.130 manu 1539: return 0; /* Normal UDP processing */
1.131 perry 1540:
1.130 manu 1541: skip = sizeof(struct udphdr) + sizeof(u_int64_t);
1542: }
1543:
1544: /*
1.136 manu 1545: * Get the UDP ports. They are handled in network
1546: * order everywhere in IPSEC_NAT_T code.
1547: */
1.158 christos 1548: udphdr = (struct udphdr *)((char *)data - skip);
1.136 manu 1549: sport = udphdr->uh_sport;
1550: dport = udphdr->uh_dport;
1551:
1552: /*
1.130 manu 1553: * Remove the UDP header (and possibly the non ESP marker)
1554: * IP header lendth is iphdrlen
1.131 perry 1555: * Before:
1.130 manu 1556: * <--- off --->
1557: * +----+------+-----+
1558: * | IP | UDP | ESP |
1559: * +----+------+-----+
1560: * <-skip->
1561: * After:
1562: * +----+-----+
1563: * | IP | ESP |
1564: * +----+-----+
1565: * <-skip->
1566: */
1567: iphdrlen = off - sizeof(struct udphdr);
1.158 christos 1568: memmove(mtod(m, char *) + skip, mtod(m, void *), iphdrlen);
1.130 manu 1569: m_adj(m, skip);
1570:
1571: ip = mtod(m, struct ip *);
1572: ip->ip_len = htons(ntohs(ip->ip_len) - skip);
1573: ip->ip_p = IPPROTO_ESP;
1574:
1575: /*
1.188 christos 1576: * We have modified the packet - it is now ESP, so we should not
1577: * return to UDP processing ...
1578: *
1.136 manu 1579: * Add a PACKET_TAG_IPSEC_NAT_T_PORT tag to remember
1580: * the source UDP port. This is required if we want
1581: * to select the right SPD for multiple hosts behind
1582: * same NAT
1583: */
1.137 manu 1584: if ((tag = m_tag_get(PACKET_TAG_IPSEC_NAT_T_PORTS,
1585: sizeof(sport) + sizeof(dport), M_DONTWAIT)) == NULL) {
1586: printf("udp4_espinudp: m_tag_get failed\n");
1.188 christos 1587: m_freem(m);
1588: return -1;
1.137 manu 1589: }
1.136 manu 1590: ((u_int16_t *)(tag + 1))[0] = sport;
1591: ((u_int16_t *)(tag + 1))[1] = dport;
1.188 christos 1592: m_tag_prepend(m, tag);
1.136 manu 1593:
1.190 christos 1594: #ifdef IPSEC
1.188 christos 1595: ipsec4_common_input(m, iphdrlen, IPPROTO_ESP);
1.147 christos 1596: #else
1.188 christos 1597: esp4_input(m, iphdrlen);
1.147 christos 1598: #endif
1.130 manu 1599:
1.185 liamjfoy 1600: /* We handled it, it shouldn't be handled by UDP */
1.188 christos 1601: *mp = NULL; /* avoid free by caller ... */
1.130 manu 1602: return 1;
1603: }
1604: #endif
1.195 rmind 1605:
1606: PR_WRAP_USRREQ(udp_usrreq)
1607:
1608: #define udp_usrreq udp_usrreq_wrapper
1609:
1610: const struct pr_usrreqs udp_usrreqs = {
1.196 ! rmind 1611: .pr_attach = udp_attach,
! 1612: .pr_detach = udp_detach,
1.195 rmind 1613: .pr_generic = udp_usrreq,
1614: };
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