Annotation of src/sys/netinet/udp_usrreq.c, Revision 1.254
1.254 ! maxv 1: /* $NetBSD: udp_usrreq.c,v 1.253 2018/05/31 07:03:57 maxv Exp $ */
1.48 itojun 2:
3: /*
4: * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
5: * All rights reserved.
1.94 itojun 6: *
1.48 itojun 7: * Redistribution and use in source and binary forms, with or without
8: * modification, are permitted provided that the following conditions
9: * are met:
10: * 1. Redistributions of source code must retain the above copyright
11: * notice, this list of conditions and the following disclaimer.
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in the
14: * documentation and/or other materials provided with the distribution.
15: * 3. Neither the name of the project nor the names of its contributors
16: * may be used to endorse or promote products derived from this software
17: * without specific prior written permission.
1.94 itojun 18: *
1.48 itojun 19: * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
20: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22: * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
23: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29: * SUCH DAMAGE.
30: */
1.14 cgd 31:
1.1 cgd 32: /*
1.44 thorpej 33: * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995
1.13 mycroft 34: * The Regents of the University of California. All rights reserved.
1.1 cgd 35: *
36: * Redistribution and use in source and binary forms, with or without
37: * modification, are permitted provided that the following conditions
38: * are met:
39: * 1. Redistributions of source code must retain the above copyright
40: * notice, this list of conditions and the following disclaimer.
41: * 2. Redistributions in binary form must reproduce the above copyright
42: * notice, this list of conditions and the following disclaimer in the
43: * documentation and/or other materials provided with the distribution.
1.104 agc 44: * 3. Neither the name of the University nor the names of its contributors
1.1 cgd 45: * may be used to endorse or promote products derived from this software
46: * without specific prior written permission.
47: *
48: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
49: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
50: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
51: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
52: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
53: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
54: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
55: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
56: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
57: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
58: * SUCH DAMAGE.
59: *
1.44 thorpej 60: * @(#)udp_usrreq.c 8.6 (Berkeley) 5/23/95
1.1 cgd 61: */
1.91 lukem 62:
1.198 rmind 63: /*
64: * UDP protocol implementation.
65: * Per RFC 768, August, 1980.
66: */
67:
1.91 lukem 68: #include <sys/cdefs.h>
1.254 ! maxv 69: __KERNEL_RCSID(0, "$NetBSD: udp_usrreq.c,v 1.253 2018/05/31 07:03:57 maxv Exp $");
1.50 thorpej 70:
1.222 pooka 71: #ifdef _KERNEL_OPT
1.77 soda 72: #include "opt_inet.h"
1.50 thorpej 73: #include "opt_ipsec.h"
1.78 thorpej 74: #include "opt_inet_csum.h"
1.64 ws 75: #include "opt_ipkdb.h"
1.101 martin 76: #include "opt_mbuftrace.h"
1.229 knakahar 77: #include "opt_net_mpsafe.h"
1.222 pooka 78: #endif
1.1 cgd 79:
1.5 mycroft 80: #include <sys/param.h>
81: #include <sys/mbuf.h>
1.192 pooka 82: #include <sys/once.h>
1.5 mycroft 83: #include <sys/protosw.h>
84: #include <sys/socket.h>
85: #include <sys/socketvar.h>
1.27 christos 86: #include <sys/systm.h>
87: #include <sys/proc.h>
1.53 itojun 88: #include <sys/domain.h>
1.27 christos 89: #include <sys/sysctl.h>
1.1 cgd 90:
1.5 mycroft 91: #include <net/if.h>
1.1 cgd 92:
1.5 mycroft 93: #include <netinet/in.h>
94: #include <netinet/in_systm.h>
1.15 cgd 95: #include <netinet/in_var.h>
1.5 mycroft 96: #include <netinet/ip.h>
97: #include <netinet/in_pcb.h>
98: #include <netinet/ip_var.h>
99: #include <netinet/ip_icmp.h>
100: #include <netinet/udp.h>
101: #include <netinet/udp_var.h>
1.166 thorpej 102: #include <netinet/udp_private.h>
1.1 cgd 103:
1.53 itojun 104: #ifdef INET6
105: #include <netinet/ip6.h>
106: #include <netinet6/ip6_var.h>
1.167 thorpej 107: #include <netinet6/ip6_private.h>
1.53 itojun 108: #include <netinet6/in6_pcb.h>
109: #include <netinet6/udp6_var.h>
1.168 thorpej 110: #include <netinet6/udp6_private.h>
1.53 itojun 111: #endif
112:
113: #ifndef INET6
114: #include <netinet/ip6.h>
115: #endif
116:
1.190 christos 117: #ifdef IPSEC
1.105 jonathan 118: #include <netipsec/ipsec.h>
1.147 christos 119: #include <netipsec/esp.h>
1.238 maxv 120: #endif
1.105 jonathan 121:
1.64 ws 122: #ifdef IPKDB
123: #include <ipkdb/ipkdb.h>
124: #endif
125:
1.238 maxv 126: int udpcksum = 1;
127: int udp_do_loopback_cksum = 0;
1.93 matt 128:
1.238 maxv 129: struct inpcbtable udbtable;
1.164 thorpej 130:
1.166 thorpej 131: percpu_t *udpstat_percpu;
1.8 mycroft 132:
1.72 itojun 133: #ifdef INET
1.190 christos 134: #ifdef IPSEC
1.250 maxv 135: static int udp4_espinudp(struct mbuf **, int, struct socket *);
1.189 christos 136: #endif
1.239 maxv 137: static void udp4_sendup(struct mbuf *, int, struct sockaddr *,
1.238 maxv 138: struct socket *);
1.239 maxv 139: static int udp4_realinput(struct sockaddr_in *, struct sockaddr_in *,
1.238 maxv 140: struct mbuf **, int);
1.129 yamt 141: static int udp4_input_checksum(struct mbuf *, const struct udphdr *, int, int);
1.72 itojun 142: #endif
143: #ifdef INET
1.238 maxv 144: static void udp_notify (struct inpcb *, int);
1.72 itojun 145: #endif
1.7 mycroft 146:
1.26 mycroft 147: #ifndef UDBHASHSIZE
148: #define UDBHASHSIZE 128
149: #endif
1.238 maxv 150: int udbhashsize = UDBHASHSIZE;
1.26 mycroft 151:
1.196 rmind 152: /*
153: * For send - really max datagram size; for receive - 40 1K datagrams.
154: */
1.238 maxv 155: static int udp_sendspace = 9216;
156: static int udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in));
1.196 rmind 157:
1.98 matt 158: #ifdef MBUFTRACE
1.150 dogcow 159: struct mowner udp_mowner = MOWNER_INIT("udp", "");
160: struct mowner udp_rx_mowner = MOWNER_INIT("udp", "rx");
161: struct mowner udp_tx_mowner = MOWNER_INIT("udp", "tx");
1.98 matt 162: #endif
163:
1.78 thorpej 164: #ifdef UDP_CSUM_COUNTERS
165: #include <sys/device.h>
166:
1.140 yamt 167: #if defined(INET)
1.78 thorpej 168: struct evcnt udp_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
169: NULL, "udp", "hwcsum bad");
170: struct evcnt udp_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
171: NULL, "udp", "hwcsum ok");
172: struct evcnt udp_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
173: NULL, "udp", "hwcsum data");
174: struct evcnt udp_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
175: NULL, "udp", "swcsum");
176:
1.120 matt 177: EVCNT_ATTACH_STATIC(udp_hwcsum_bad);
178: EVCNT_ATTACH_STATIC(udp_hwcsum_ok);
179: EVCNT_ATTACH_STATIC(udp_hwcsum_data);
180: EVCNT_ATTACH_STATIC(udp_swcsum);
1.140 yamt 181: #endif /* defined(INET) */
182:
183: #define UDP_CSUM_COUNTER_INCR(ev) (ev)->ev_count++
1.78 thorpej 184: #else
185: #define UDP_CSUM_COUNTER_INCR(ev) /* nothing */
186: #endif /* UDP_CSUM_COUNTERS */
187:
1.179 pooka 188: static void sysctl_net_inet_udp_setup(struct sysctllog **);
189:
1.192 pooka 190: static int
191: do_udpinit(void)
1.1 cgd 192: {
1.18 mycroft 193:
1.35 mycroft 194: in_pcbinit(&udbtable, udbhashsize, udbhashsize);
1.193 pooka 195: udpstat_percpu = percpu_alloc(sizeof(uint64_t) * UDP_NSTATS);
1.78 thorpej 196:
1.98 matt 197: MOWNER_ATTACH(&udp_tx_mowner);
198: MOWNER_ATTACH(&udp_rx_mowner);
199: MOWNER_ATTACH(&udp_mowner);
1.166 thorpej 200:
1.192 pooka 201: return 0;
202: }
203:
204: void
205: udp_init_common(void)
206: {
207: static ONCE_DECL(doudpinit);
208:
209: RUN_ONCE(&doudpinit, do_udpinit);
210: }
211:
212: void
213: udp_init(void)
214: {
215:
216: sysctl_net_inet_udp_setup(NULL);
217:
218: udp_init_common();
1.1 cgd 219: }
220:
1.129 yamt 221: /*
222: * Checksum extended UDP header and data.
223: */
224: int
225: udp_input_checksum(int af, struct mbuf *m, const struct udphdr *uh,
226: int iphlen, int len)
227: {
228:
229: switch (af) {
1.72 itojun 230: #ifdef INET
1.129 yamt 231: case AF_INET:
232: return udp4_input_checksum(m, uh, iphlen, len);
233: #endif
234: #ifdef INET6
235: case AF_INET6:
236: return udp6_input_checksum(m, uh, iphlen, len);
237: #endif
238: }
239: #ifdef DIAGNOSTIC
240: panic("udp_input_checksum: unknown af %d", af);
241: #endif
242: /* NOTREACHED */
243: return -1;
244: }
245:
246: #ifdef INET
247:
248: /*
249: * Checksum extended UDP header and data.
250: */
251: static int
252: udp4_input_checksum(struct mbuf *m, const struct udphdr *uh,
253: int iphlen, int len)
254: {
255:
256: /*
257: * XXX it's better to record and check if this mbuf is
258: * already checked.
259: */
260:
261: if (uh->uh_sum == 0)
262: return 0;
263:
264: switch (m->m_pkthdr.csum_flags &
1.226 ozaki-r 265: ((m_get_rcvif_NOMPSAFE(m)->if_csum_flags_rx & M_CSUM_UDPv4) |
1.129 yamt 266: M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) {
267: case M_CSUM_UDPv4|M_CSUM_TCP_UDP_BAD:
268: UDP_CSUM_COUNTER_INCR(&udp_hwcsum_bad);
269: goto badcsum;
270:
271: case M_CSUM_UDPv4|M_CSUM_DATA: {
272: u_int32_t hw_csum = m->m_pkthdr.csum_data;
273:
274: UDP_CSUM_COUNTER_INCR(&udp_hwcsum_data);
275: if (m->m_pkthdr.csum_flags & M_CSUM_NO_PSEUDOHDR) {
276: const struct ip *ip =
277: mtod(m, const struct ip *);
278:
279: hw_csum = in_cksum_phdr(ip->ip_src.s_addr,
280: ip->ip_dst.s_addr,
281: htons(hw_csum + len + IPPROTO_UDP));
282: }
283: if ((hw_csum ^ 0xffff) != 0)
284: goto badcsum;
285: break;
286: }
287:
288: case M_CSUM_UDPv4:
289: /* Checksum was okay. */
290: UDP_CSUM_COUNTER_INCR(&udp_hwcsum_ok);
291: break;
292:
293: default:
294: /*
295: * Need to compute it ourselves. Maybe skip checksum
296: * on loopback interfaces.
297: */
1.226 ozaki-r 298: if (__predict_true(!(m_get_rcvif_NOMPSAFE(m)->if_flags &
1.129 yamt 299: IFF_LOOPBACK) ||
300: udp_do_loopback_cksum)) {
301: UDP_CSUM_COUNTER_INCR(&udp_swcsum);
302: if (in4_cksum(m, IPPROTO_UDP, iphlen, len) != 0)
303: goto badcsum;
304: }
305: break;
306: }
307:
308: return 0;
309:
310: badcsum:
1.166 thorpej 311: UDP_STATINC(UDP_STAT_BADSUM);
1.129 yamt 312: return -1;
313: }
314:
1.7 mycroft 315: void
1.27 christos 316: udp_input(struct mbuf *m, ...)
1.1 cgd 317: {
1.53 itojun 318: va_list ap;
319: struct sockaddr_in src, dst;
320: struct ip *ip;
321: struct udphdr *uh;
1.97 simonb 322: int iphlen;
1.53 itojun 323: int len;
324: int n;
1.96 itojun 325: u_int16_t ip_len;
1.53 itojun 326:
327: va_start(ap, m);
328: iphlen = va_arg(ap, int);
1.97 simonb 329: (void)va_arg(ap, int); /* ignore value, advance ap */
1.53 itojun 330: va_end(ap);
331:
1.98 matt 332: MCLAIM(m, &udp_rx_mowner);
1.166 thorpej 333: UDP_STATINC(UDP_STAT_IPACKETS);
1.53 itojun 334:
335: /*
336: * Get IP and UDP header together in first mbuf.
337: */
338: ip = mtod(m, struct ip *);
1.252 maxv 339: M_REGION_GET(uh, struct udphdr *, m, iphlen, sizeof(struct udphdr));
1.53 itojun 340: if (uh == NULL) {
1.166 thorpej 341: UDP_STATINC(UDP_STAT_HDROPS);
1.53 itojun 342: return;
343: }
1.238 maxv 344:
1.228 mlelstv 345: /*
346: * Enforce alignment requirements that are violated in
347: * some cases, see kern/50766 for details.
348: */
349: if (UDP_HDR_ALIGNED_P(uh) == 0) {
350: m = m_copyup(m, iphlen + sizeof(struct udphdr), 0);
351: if (m == NULL) {
352: UDP_STATINC(UDP_STAT_HDROPS);
353: return;
354: }
355: ip = mtod(m, struct ip *);
356: uh = (struct udphdr *)(mtod(m, char *) + iphlen);
357: }
1.95 thorpej 358: KASSERT(UDP_HDR_ALIGNED_P(uh));
1.53 itojun 359:
1.57 itojun 360: /* destination port of 0 is illegal, based on RFC768. */
361: if (uh->uh_dport == 0)
362: goto bad;
363:
1.53 itojun 364: /*
365: * Make mbuf data length reflect UDP length.
366: * If not enough data to reflect UDP length, drop.
367: */
1.96 itojun 368: ip_len = ntohs(ip->ip_len);
1.53 itojun 369: len = ntohs((u_int16_t)uh->uh_ulen);
1.248 maxv 370: if (len < sizeof(struct udphdr)) {
371: UDP_STATINC(UDP_STAT_BADLEN);
372: goto bad;
373: }
1.96 itojun 374: if (ip_len != iphlen + len) {
1.248 maxv 375: if (ip_len < iphlen + len) {
1.166 thorpej 376: UDP_STATINC(UDP_STAT_BADLEN);
1.53 itojun 377: goto bad;
378: }
1.96 itojun 379: m_adj(m, iphlen + len - ip_len);
1.53 itojun 380: }
381:
382: /*
383: * Checksum extended UDP header and data.
384: */
1.129 yamt 385: if (udp4_input_checksum(m, uh, iphlen, len))
386: goto badcsum;
1.53 itojun 387:
388: /* construct source and dst sockaddrs. */
1.159 dyoung 389: sockaddr_in_init(&src, &ip->ip_src, uh->uh_sport);
390: sockaddr_in_init(&dst, &ip->ip_dst, uh->uh_dport);
1.53 itojun 391:
1.144 manu 392: if ((n = udp4_realinput(&src, &dst, &m, iphlen)) == -1) {
1.166 thorpej 393: UDP_STATINC(UDP_STAT_HDROPS);
1.144 manu 394: return;
395: }
1.188 christos 396: if (m == NULL) {
397: /*
398: * packet has been processed by ESP stuff -
399: * e.g. dropped NAT-T-keep-alive-packet ...
400: */
401: return;
402: }
1.237 maxv 403:
1.242 maxv 404: ip = mtod(m, struct ip *);
1.252 maxv 405: M_REGION_GET(uh, struct udphdr *, m, iphlen, sizeof(struct udphdr));
1.242 maxv 406: if (uh == NULL) {
407: UDP_STATINC(UDP_STAT_HDROPS);
408: return;
409: }
410: /* XXX Re-enforce alignment? */
411:
1.53 itojun 412: #ifdef INET6
413: if (IN_MULTICAST(ip->ip_dst.s_addr) || n == 0) {
414: struct sockaddr_in6 src6, dst6;
415:
1.175 cegger 416: memset(&src6, 0, sizeof(src6));
1.53 itojun 417: src6.sin6_family = AF_INET6;
418: src6.sin6_len = sizeof(struct sockaddr_in6);
1.224 rtr 419: in6_in_2_v4mapin6(&ip->ip_src, &src6.sin6_addr);
1.53 itojun 420: src6.sin6_port = uh->uh_sport;
1.175 cegger 421: memset(&dst6, 0, sizeof(dst6));
1.53 itojun 422: dst6.sin6_family = AF_INET6;
423: dst6.sin6_len = sizeof(struct sockaddr_in6);
1.224 rtr 424: in6_in_2_v4mapin6(&ip->ip_dst, &dst6.sin6_addr);
1.53 itojun 425: dst6.sin6_port = uh->uh_dport;
426:
427: n += udp6_realinput(AF_INET, &src6, &dst6, m, iphlen);
428: }
429: #endif
430:
431: if (n == 0) {
432: if (m->m_flags & (M_BCAST | M_MCAST)) {
1.166 thorpej 433: UDP_STATINC(UDP_STAT_NOPORTBCAST);
1.53 itojun 434: goto bad;
435: }
1.166 thorpej 436: UDP_STATINC(UDP_STAT_NOPORT);
1.64 ws 437: #ifdef IPKDB
1.53 itojun 438: if (checkipkdb(&ip->ip_src, uh->uh_sport, uh->uh_dport,
1.238 maxv 439: m, iphlen + sizeof(struct udphdr),
440: m->m_pkthdr.len - iphlen - sizeof(struct udphdr))) {
1.53 itojun 441: /*
442: * It was a debugger connect packet,
443: * just drop it now
444: */
445: goto bad;
446: }
447: #endif
448: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
449: m = NULL;
450: }
451:
452: bad:
453: if (m)
454: m_freem(m);
1.78 thorpej 455: return;
456:
457: badcsum:
458: m_freem(m);
1.53 itojun 459: }
1.72 itojun 460: #endif
1.53 itojun 461:
1.72 itojun 462: #ifdef INET
1.53 itojun 463: static void
1.119 matt 464: udp4_sendup(struct mbuf *m, int off /* offset of data portion */,
1.238 maxv 465: struct sockaddr *src, struct socket *so)
1.53 itojun 466: {
467: struct mbuf *opts = NULL;
468: struct mbuf *n;
1.232 ozaki-r 469: struct inpcb *inp;
1.53 itojun 470:
1.233 ozaki-r 471: KASSERT(so != NULL);
1.232 ozaki-r 472: KASSERT(so->so_proto->pr_domain->dom_family == AF_INET);
473: inp = sotoinpcb(so);
474: KASSERT(inp != NULL);
1.53 itojun 475:
1.190 christos 476: #if defined(IPSEC)
1.243 maxv 477: if (ipsec_used && ipsec_in_reject(m, inp)) {
1.162 dyoung 478: if ((n = m_copypacket(m, M_DONTWAIT)) != NULL)
1.110 itojun 479: icmp_error(n, ICMP_UNREACH, ICMP_UNREACH_ADMIN_PROHIBIT,
480: 0, 0);
1.53 itojun 481: return;
482: }
1.238 maxv 483: #endif
1.53 itojun 484:
1.162 dyoung 485: if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) {
1.238 maxv 486: if (inp->inp_flags & INP_CONTROLOPTS ||
487: SOOPT_TIMESTAMP(so->so_options)) {
1.53 itojun 488: struct ip *ip = mtod(n, struct ip *);
489: ip_savecontrol(inp, &opts, ip, n);
490: }
491:
492: m_adj(n, off);
1.238 maxv 493: if (sbappendaddr(&so->so_rcv, src, n, opts) == 0) {
1.53 itojun 494: m_freem(n);
495: if (opts)
496: m_freem(opts);
1.166 thorpej 497: UDP_STATINC(UDP_STAT_FULLSOCK);
1.246 roy 498: soroverflow(so);
1.53 itojun 499: } else
500: sorwakeup(so);
501: }
502: }
1.72 itojun 503: #endif
1.53 itojun 504:
1.72 itojun 505: #ifdef INET
1.53 itojun 506: static int
1.119 matt 507: udp4_realinput(struct sockaddr_in *src, struct sockaddr_in *dst,
1.238 maxv 508: struct mbuf **mp, int off /* offset of udphdr */)
1.53 itojun 509: {
510: u_int16_t *sport, *dport;
511: int rcvcnt;
512: struct in_addr *src4, *dst4;
1.109 itojun 513: struct inpcb_hdr *inph;
1.53 itojun 514: struct inpcb *inp;
1.144 manu 515: struct mbuf *m = *mp;
1.53 itojun 516:
517: rcvcnt = 0;
518: off += sizeof(struct udphdr); /* now, offset of payload */
519:
520: if (src->sin_family != AF_INET || dst->sin_family != AF_INET)
521: goto bad;
522:
523: src4 = &src->sin_addr;
524: sport = &src->sin_port;
525: dst4 = &dst->sin_addr;
526: dport = &dst->sin_port;
527:
1.73 itojun 528: if (IN_MULTICAST(dst4->s_addr) ||
1.226 ozaki-r 529: in_broadcast(*dst4, m_get_rcvif_NOMPSAFE(m))) {
1.53 itojun 530: /*
531: * Deliver a multicast or broadcast datagram to *all* sockets
532: * for which the local and remote addresses and ports match
533: * those of the incoming datagram. This allows more than
534: * one process to receive multi/broadcasts on the same port.
535: * (This really ought to be done for unicast datagrams as
536: * well, but that would cause problems with existing
537: * applications that open both address-specific sockets and
538: * a wildcard socket listening to the same port -- they would
539: * end up receiving duplicates of every unicast datagram.
540: * Those applications open the multiple sockets to overcome an
541: * inadequacy of the UDP socket interface, but for backwards
542: * compatibility we avoid the problem here rather than
543: * fixing the interface. Maybe 4.5BSD will remedy this?)
544: */
545:
546: /*
1.92 itojun 547: * KAME note: traditionally we dropped udpiphdr from mbuf here.
1.71 itojun 548: * we need udpiphdr for IPsec processing so we do that later.
1.53 itojun 549: */
550: /*
551: * Locate pcb(s) for datagram.
552: */
1.191 christos 553: TAILQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) {
1.109 itojun 554: inp = (struct inpcb *)inph;
555: if (inp->inp_af != AF_INET)
556: continue;
557:
1.53 itojun 558: if (inp->inp_lport != *dport)
559: continue;
560: if (!in_nullhost(inp->inp_laddr)) {
561: if (!in_hosteq(inp->inp_laddr, *dst4))
562: continue;
563: }
564: if (!in_nullhost(inp->inp_faddr)) {
565: if (!in_hosteq(inp->inp_faddr, *src4) ||
566: inp->inp_fport != *sport)
567: continue;
568: }
569:
570: udp4_sendup(m, off, (struct sockaddr *)src,
1.238 maxv 571: inp->inp_socket);
1.53 itojun 572: rcvcnt++;
573:
574: /*
575: * Don't look for additional matches if this one does
576: * not have either the SO_REUSEPORT or SO_REUSEADDR
577: * socket options set. This heuristic avoids searching
578: * through all pcbs in the common case of a non-shared
579: * port. It assumes that an application will never
580: * clear these options after setting them.
581: */
582: if ((inp->inp_socket->so_options &
583: (SO_REUSEPORT|SO_REUSEADDR)) == 0)
584: break;
585: }
586: } else {
587: /*
588: * Locate pcb for datagram.
589: */
1.180 dyoung 590: inp = in_pcblookup_connect(&udbtable, *src4, *sport, *dst4,
591: *dport, 0);
1.53 itojun 592: if (inp == 0) {
1.166 thorpej 593: UDP_STATINC(UDP_STAT_PCBHASHMISS);
1.53 itojun 594: inp = in_pcblookup_bind(&udbtable, *dst4, *dport);
1.82 itojun 595: if (inp == 0)
1.53 itojun 596: return rcvcnt;
597: }
598:
1.190 christos 599: #ifdef IPSEC
1.130 manu 600: /* Handle ESP over UDP */
1.253 maxv 601: if (inp->inp_flags & INP_ESPINUDP) {
1.250 maxv 602: switch (udp4_espinudp(mp, off, inp->inp_socket)) {
1.242 maxv 603: case -1: /* Error, m was freed */
604: rcvcnt = -1;
605: goto bad;
606:
607: case 1: /* ESP over UDP */
608: rcvcnt++;
609: goto bad;
610:
611: case 0: /* plain UDP */
612: default: /* Unexpected */
613: /*
614: * Normal UDP processing will take place,
615: * m may have changed.
616: */
617: m = *mp;
618: break;
619: }
1.130 manu 620: }
1.189 christos 621: #endif
1.130 manu 622:
1.178 minskim 623: /*
624: * Check the minimum TTL for socket.
625: */
626: if (mtod(m, struct ip *)->ip_ttl < inp->inp_ip_minttl)
627: goto bad;
628:
1.53 itojun 629: udp4_sendup(m, off, (struct sockaddr *)src, inp->inp_socket);
630: rcvcnt++;
631: }
632:
633: bad:
634: return rcvcnt;
635: }
1.72 itojun 636: #endif
1.53 itojun 637:
1.72 itojun 638: #ifdef INET
1.1 cgd 639: /*
640: * Notify a udp user of an asynchronous error;
641: * just wake up so that he can collect error status.
642: */
1.7 mycroft 643: static void
1.119 matt 644: udp_notify(struct inpcb *inp, int errno)
1.1 cgd 645: {
646: inp->inp_socket->so_error = errno;
647: sorwakeup(inp->inp_socket);
648: sowwakeup(inp->inp_socket);
649: }
650:
1.27 christos 651: void *
1.157 dyoung 652: udp_ctlinput(int cmd, const struct sockaddr *sa, void *v)
1.1 cgd 653: {
1.66 augustss 654: struct ip *ip = v;
655: struct udphdr *uh;
1.119 matt 656: void (*notify)(struct inpcb *, int) = udp_notify;
1.21 mycroft 657: int errno;
1.1 cgd 658:
1.238 maxv 659: if (sa->sa_family != AF_INET ||
660: sa->sa_len != sizeof(struct sockaddr_in))
1.51 itojun 661: return NULL;
1.20 mycroft 662: if ((unsigned)cmd >= PRC_NCMDS)
1.27 christos 663: return NULL;
1.239 maxv 664:
1.20 mycroft 665: errno = inetctlerrmap[cmd];
1.239 maxv 666: if (PRC_IS_REDIRECT(cmd)) {
667: notify = in_rtchange;
668: ip = NULL;
669: } else if (cmd == PRC_HOSTDEAD) {
670: ip = NULL;
671: } else if (errno == 0) {
1.27 christos 672: return NULL;
1.239 maxv 673: }
674:
1.19 mycroft 675: if (ip) {
1.158 christos 676: uh = (struct udphdr *)((char *)ip + (ip->ip_hl << 2));
1.157 dyoung 677: in_pcbnotify(&udbtable, satocsin(sa)->sin_addr, uh->uh_dport,
1.34 mycroft 678: ip->ip_src, uh->uh_sport, errno, notify);
1.53 itojun 679: /* XXX mapped address case */
1.239 maxv 680: } else {
1.157 dyoung 681: in_pcbnotifyall(&udbtable, satocsin(sa)->sin_addr, errno,
1.34 mycroft 682: notify);
1.239 maxv 683: }
684:
1.27 christos 685: return NULL;
1.1 cgd 686: }
687:
1.7 mycroft 688: int
1.173 plunky 689: udp_ctloutput(int op, struct socket *so, struct sockopt *sopt)
1.130 manu 690: {
691: int s;
692: int error = 0;
693: struct inpcb *inp;
694: int family;
1.173 plunky 695: int optval;
1.130 manu 696:
697: family = so->so_proto->pr_domain->dom_family;
698:
699: s = splsoftnet();
700: switch (family) {
701: #ifdef INET
702: case PF_INET:
1.173 plunky 703: if (sopt->sopt_level != IPPROTO_UDP) {
704: error = ip_ctloutput(op, so, sopt);
1.130 manu 705: goto end;
706: }
707: break;
708: #endif
709: #ifdef INET6
710: case PF_INET6:
1.173 plunky 711: if (sopt->sopt_level != IPPROTO_UDP) {
712: error = ip6_ctloutput(op, so, sopt);
1.130 manu 713: goto end;
714: }
715: break;
716: #endif
717: default:
718: error = EAFNOSUPPORT;
719: goto end;
720: }
721:
722:
723: switch (op) {
724: case PRCO_SETOPT:
725: inp = sotoinpcb(so);
726:
1.173 plunky 727: switch (sopt->sopt_name) {
1.130 manu 728: case UDP_ENCAP:
1.173 plunky 729: error = sockopt_getint(sopt, &optval);
730: if (error)
1.153 yamt 731: break;
1.131 perry 732:
1.173 plunky 733: switch(optval) {
1.130 manu 734: case 0:
1.253 maxv 735: inp->inp_flags &= ~INP_ESPINUDP;
1.130 manu 736: break;
737:
738: case UDP_ENCAP_ESPINUDP:
739: inp->inp_flags |= INP_ESPINUDP;
740: break;
1.131 perry 741:
1.130 manu 742: default:
743: error = EINVAL;
744: break;
745: }
746: break;
1.238 maxv 747:
1.130 manu 748: default:
749: error = ENOPROTOOPT;
750: break;
751: }
752: break;
753:
754: default:
755: error = EINVAL;
756: break;
1.131 perry 757: }
758:
1.130 manu 759: end:
760: splx(s);
761: return error;
762: }
1.131 perry 763:
1.130 manu 764: int
1.235 ryo 765: udp_output(struct mbuf *m, struct inpcb *inp, struct mbuf *control,
766: struct lwp *l)
1.27 christos 767: {
1.66 augustss 768: struct udpiphdr *ui;
1.125 thorpej 769: struct route *ro;
1.235 ryo 770: struct ip_pktopts pktopts;
771: kauth_cred_t cred;
1.66 augustss 772: int len = m->m_pkthdr.len;
1.235 ryo 773: int error, flags = 0;
1.27 christos 774:
1.98 matt 775: MCLAIM(m, &udp_tx_mowner);
1.1 cgd 776:
777: /*
778: * Calculate data length and get a mbuf
779: * for UDP and IP headers.
780: */
1.13 mycroft 781: M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT);
1.239 maxv 782: if (m == NULL) {
1.13 mycroft 783: error = ENOBUFS;
1.39 thorpej 784: goto release;
785: }
786:
787: /*
788: * Compute the packet length of the IP header, and
789: * punt if the length looks bogus.
790: */
1.96 itojun 791: if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) {
1.39 thorpej 792: error = EMSGSIZE;
1.13 mycroft 793: goto release;
794: }
1.1 cgd 795:
1.235 ryo 796: if (l == NULL)
797: cred = NULL;
798: else
799: cred = l->l_cred;
800:
801: /* Setup IP outgoing packet options */
802: memset(&pktopts, 0, sizeof(pktopts));
1.236 ryo 803: error = ip_setpktopts(control, &pktopts, &flags, inp, cred);
1.235 ryo 804: if (error != 0)
805: goto release;
806:
807: if (control != NULL) {
808: m_freem(control);
809: control = NULL;
810: }
811:
1.1 cgd 812: /*
813: * Fill in mbuf with extended UDP header
814: * and addresses and length put into network format.
815: */
816: ui = mtod(m, struct udpiphdr *);
817: ui->ui_pr = IPPROTO_UDP;
1.235 ryo 818: ui->ui_src = pktopts.ippo_laddr.sin_addr;
1.1 cgd 819: ui->ui_dst = inp->inp_faddr;
820: ui->ui_sport = inp->inp_lport;
821: ui->ui_dport = inp->inp_fport;
1.78 thorpej 822: ui->ui_ulen = htons((u_int16_t)len + sizeof(struct udphdr));
1.1 cgd 823:
1.125 thorpej 824: ro = &inp->inp_route;
825:
1.1 cgd 826: /*
1.78 thorpej 827: * Set up checksum and output datagram.
1.1 cgd 828: */
829: if (udpcksum) {
1.78 thorpej 830: /*
831: * XXX Cache pseudo-header checksum part for
832: * XXX "connected" UDP sockets.
833: */
834: ui->ui_sum = in_cksum_phdr(ui->ui_src.s_addr,
835: ui->ui_dst.s_addr, htons((u_int16_t)len +
836: sizeof(struct udphdr) + IPPROTO_UDP));
1.135 yamt 837: m->m_pkthdr.csum_flags = M_CSUM_UDPv4;
1.78 thorpej 838: m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
839: } else
840: ui->ui_sum = 0;
1.239 maxv 841:
842: ((struct ip *)ui)->ip_len = htons(sizeof(struct udpiphdr) + len);
1.1 cgd 843: ((struct ip *)ui)->ip_ttl = inp->inp_ip.ip_ttl; /* XXX */
844: ((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; /* XXX */
1.166 thorpej 845: UDP_STATINC(UDP_STAT_OPACKETS);
1.48 itojun 846:
1.235 ryo 847: flags |= inp->inp_socket->so_options & (SO_DONTROUTE|SO_BROADCAST);
848: return ip_output(m, inp->inp_options, ro, flags, pktopts.ippo_imo, inp);
1.1 cgd 849:
1.235 ryo 850: release:
851: if (control != NULL)
852: m_freem(control);
1.1 cgd 853: m_freem(m);
1.235 ryo 854: return error;
1.1 cgd 855: }
856:
1.196 rmind 857: static int
858: udp_attach(struct socket *so, int proto)
859: {
860: struct inpcb *inp;
861: int error;
862:
863: KASSERT(sotoinpcb(so) == NULL);
864:
865: /* Assign the lock (must happen even if we will error out). */
866: sosetlock(so);
867:
868: #ifdef MBUFTRACE
869: so->so_mowner = &udp_mowner;
870: so->so_rcv.sb_mowner = &udp_rx_mowner;
871: so->so_snd.sb_mowner = &udp_tx_mowner;
872: #endif
873: if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
874: error = soreserve(so, udp_sendspace, udp_recvspace);
875: if (error) {
876: return error;
877: }
878: }
879:
880: error = in_pcballoc(so, &udbtable);
881: if (error) {
882: return error;
883: }
884: inp = sotoinpcb(so);
885: inp->inp_ip.ip_ttl = ip_defttl;
886: KASSERT(solocked(so));
887:
888: return error;
889: }
890:
891: static void
892: udp_detach(struct socket *so)
893: {
894: struct inpcb *inp;
895:
896: KASSERT(solocked(so));
897: inp = sotoinpcb(so);
898: KASSERT(inp != NULL);
899: in_pcbdetach(inp);
900: }
1.1 cgd 901:
1.195 rmind 902: static int
1.219 rtr 903: udp_accept(struct socket *so, struct sockaddr *nam)
1.208 rtr 904: {
905: KASSERT(solocked(so));
906:
907: panic("udp_accept");
1.210 rtr 908:
1.208 rtr 909: return EOPNOTSUPP;
910: }
911:
912: static int
1.218 rtr 913: udp_bind(struct socket *so, struct sockaddr *nam, struct lwp *l)
1.210 rtr 914: {
915: struct inpcb *inp = sotoinpcb(so);
1.218 rtr 916: struct sockaddr_in *sin = (struct sockaddr_in *)nam;
1.210 rtr 917: int error = 0;
918: int s;
919:
920: KASSERT(solocked(so));
921: KASSERT(inp != NULL);
922: KASSERT(nam != NULL);
923:
924: s = splsoftnet();
1.218 rtr 925: error = in_pcbbind(inp, sin, l);
1.210 rtr 926: splx(s);
927:
928: return error;
929: }
930:
931: static int
1.214 rtr 932: udp_listen(struct socket *so, struct lwp *l)
1.210 rtr 933: {
934: KASSERT(solocked(so));
935:
936: return EOPNOTSUPP;
937: }
938:
1.211 rtr 939: static int
1.221 rtr 940: udp_connect(struct socket *so, struct sockaddr *nam, struct lwp *l)
1.211 rtr 941: {
942: struct inpcb *inp = sotoinpcb(so);
943: int error = 0;
944: int s;
945:
946: KASSERT(solocked(so));
947: KASSERT(inp != NULL);
948: KASSERT(nam != NULL);
949:
950: s = splsoftnet();
1.221 rtr 951: error = in_pcbconnect(inp, (struct sockaddr_in *)nam, l);
1.211 rtr 952: if (! error)
953: soisconnected(so);
954: splx(s);
955: return error;
956: }
1.210 rtr 957:
958: static int
1.217 rtr 959: udp_connect2(struct socket *so, struct socket *so2)
960: {
961: KASSERT(solocked(so));
962:
963: return EOPNOTSUPP;
964: }
965:
966: static int
1.212 rtr 967: udp_disconnect(struct socket *so)
968: {
969: struct inpcb *inp = sotoinpcb(so);
970: int s;
971:
972: KASSERT(solocked(so));
973: KASSERT(inp != NULL);
974:
975: s = splsoftnet();
976: /*soisdisconnected(so);*/
977: so->so_state &= ~SS_ISCONNECTED; /* XXX */
978: in_pcbdisconnect(inp);
979: inp->inp_laddr = zeroin_addr; /* XXX */
980: in_pcbstate(inp, INP_BOUND); /* XXX */
981: splx(s);
982:
983: return 0;
984: }
985:
986: static int
987: udp_shutdown(struct socket *so)
988: {
989: int s;
990:
991: KASSERT(solocked(so));
992:
993: s = splsoftnet();
994: socantsendmore(so);
995: splx(s);
996:
997: return 0;
998: }
999:
1000: static int
1001: udp_abort(struct socket *so)
1002: {
1003: KASSERT(solocked(so));
1004:
1005: panic("udp_abort");
1006:
1007: return EOPNOTSUPP;
1008: }
1009:
1010: static int
1.202 rtr 1011: udp_ioctl(struct socket *so, u_long cmd, void *nam, struct ifnet *ifp)
1.200 rtr 1012: {
1.202 rtr 1013: return in_control(so, cmd, nam, ifp);
1.200 rtr 1014: }
1015:
1016: static int
1.203 rtr 1017: udp_stat(struct socket *so, struct stat *ub)
1018: {
1.206 rtr 1019: KASSERT(solocked(so));
1020:
1.205 rtr 1021: /* stat: don't bother with a blocksize. */
1022: return 0;
1.203 rtr 1023: }
1024:
1025: static int
1.219 rtr 1026: udp_peeraddr(struct socket *so, struct sockaddr *nam)
1.207 rtr 1027: {
1.213 rtr 1028: int s;
1029:
1.207 rtr 1030: KASSERT(solocked(so));
1031: KASSERT(sotoinpcb(so) != NULL);
1032: KASSERT(nam != NULL);
1033:
1.213 rtr 1034: s = splsoftnet();
1.219 rtr 1035: in_setpeeraddr(sotoinpcb(so), (struct sockaddr_in *)nam);
1.213 rtr 1036: splx(s);
1037:
1.207 rtr 1038: return 0;
1039: }
1040:
1041: static int
1.219 rtr 1042: udp_sockaddr(struct socket *so, struct sockaddr *nam)
1.207 rtr 1043: {
1.213 rtr 1044: int s;
1045:
1.207 rtr 1046: KASSERT(solocked(so));
1047: KASSERT(sotoinpcb(so) != NULL);
1048: KASSERT(nam != NULL);
1049:
1.213 rtr 1050: s = splsoftnet();
1.219 rtr 1051: in_setsockaddr(sotoinpcb(so), (struct sockaddr_in *)nam);
1.213 rtr 1052: splx(s);
1053:
1.207 rtr 1054: return 0;
1055: }
1056:
1057: static int
1.216 rtr 1058: udp_rcvd(struct socket *so, int flags, struct lwp *l)
1059: {
1060: KASSERT(solocked(so));
1061:
1062: return EOPNOTSUPP;
1063: }
1064:
1065: static int
1.209 rtr 1066: udp_recvoob(struct socket *so, struct mbuf *m, int flags)
1067: {
1068: KASSERT(solocked(so));
1069:
1070: return EOPNOTSUPP;
1071: }
1072:
1073: static int
1.221 rtr 1074: udp_send(struct socket *so, struct mbuf *m, struct sockaddr *nam,
1.215 rtr 1075: struct mbuf *control, struct lwp *l)
1076: {
1077: struct inpcb *inp = sotoinpcb(so);
1078: int error = 0;
1079: struct in_addr laddr; /* XXX */
1080: int s;
1081:
1082: KASSERT(solocked(so));
1083: KASSERT(inp != NULL);
1084: KASSERT(m != NULL);
1085:
1086: memset(&laddr, 0, sizeof laddr);
1087:
1088: s = splsoftnet();
1089: if (nam) {
1090: laddr = inp->inp_laddr; /* XXX */
1091: if ((so->so_state & SS_ISCONNECTED) != 0) {
1092: error = EISCONN;
1093: goto die;
1094: }
1.221 rtr 1095: error = in_pcbconnect(inp, (struct sockaddr_in *)nam, l);
1.215 rtr 1096: if (error)
1097: goto die;
1098: } else {
1099: if ((so->so_state & SS_ISCONNECTED) == 0) {
1100: error = ENOTCONN;
1101: goto die;
1102: }
1103: }
1.235 ryo 1104: error = udp_output(m, inp, control, l);
1.215 rtr 1105: m = NULL;
1.235 ryo 1106: control = NULL;
1.215 rtr 1107: if (nam) {
1108: in_pcbdisconnect(inp);
1109: inp->inp_laddr = laddr; /* XXX */
1110: in_pcbstate(inp, INP_BOUND); /* XXX */
1111: }
1112: die:
1.235 ryo 1113: if (m != NULL)
1.215 rtr 1114: m_freem(m);
1.235 ryo 1115: if (control != NULL)
1116: m_freem(control);
1.215 rtr 1117:
1118: splx(s);
1119: return error;
1120: }
1121:
1122: static int
1.209 rtr 1123: udp_sendoob(struct socket *so, struct mbuf *m, struct mbuf *control)
1124: {
1125: KASSERT(solocked(so));
1126:
1127: m_freem(m);
1128: m_freem(control);
1129:
1130: return EOPNOTSUPP;
1131: }
1132:
1133: static int
1.217 rtr 1134: udp_purgeif(struct socket *so, struct ifnet *ifp)
1135: {
1136: int s;
1137:
1138: s = splsoftnet();
1139: mutex_enter(softnet_lock);
1.230 ozaki-r 1140: in_pcbpurgeif0(&udbtable, ifp);
1141: #ifdef NET_MPSAFE
1142: mutex_exit(softnet_lock);
1.229 knakahar 1143: #endif
1.217 rtr 1144: in_purgeif(ifp);
1.230 ozaki-r 1145: #ifdef NET_MPSAFE
1146: mutex_enter(softnet_lock);
1147: #endif
1.217 rtr 1148: in_pcbpurgeif(&udbtable, ifp);
1149: mutex_exit(softnet_lock);
1150: splx(s);
1151:
1152: return 0;
1153: }
1154:
1155: static int
1.166 thorpej 1156: sysctl_net_inet_udp_stats(SYSCTLFN_ARGS)
1157: {
1158:
1.172 thorpej 1159: return (NETSTAT_SYSCTL(udpstat_percpu, UDP_NSTATS));
1.166 thorpej 1160: }
1161:
1.13 mycroft 1162: /*
1163: * Sysctl for udp variables.
1164: */
1.179 pooka 1165: static void
1166: sysctl_net_inet_udp_setup(struct sysctllog **clog)
1.13 mycroft 1167: {
1.194 pooka 1168:
1.116 atatat 1169: sysctl_createv(clog, 0, NULL, NULL,
1170: CTLFLAG_PERMANENT,
1.114 atatat 1171: CTLTYPE_NODE, "inet", NULL,
1172: NULL, 0, NULL, 0,
1173: CTL_NET, PF_INET, CTL_EOL);
1.116 atatat 1174: sysctl_createv(clog, 0, NULL, NULL,
1175: CTLFLAG_PERMANENT,
1.122 atatat 1176: CTLTYPE_NODE, "udp",
1177: SYSCTL_DESCR("UDPv4 related settings"),
1.114 atatat 1178: NULL, 0, NULL, 0,
1179: CTL_NET, PF_INET, IPPROTO_UDP, CTL_EOL);
1180:
1.116 atatat 1181: sysctl_createv(clog, 0, NULL, NULL,
1182: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122 atatat 1183: CTLTYPE_INT, "checksum",
1.123 heas 1184: SYSCTL_DESCR("Compute UDP checksums"),
1.114 atatat 1185: NULL, 0, &udpcksum, 0,
1186: CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_CHECKSUM,
1187: CTL_EOL);
1.116 atatat 1188: sysctl_createv(clog, 0, NULL, NULL,
1189: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122 atatat 1190: CTLTYPE_INT, "sendspace",
1191: SYSCTL_DESCR("Default UDP send buffer size"),
1.114 atatat 1192: NULL, 0, &udp_sendspace, 0,
1193: CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_SENDSPACE,
1194: CTL_EOL);
1.116 atatat 1195: sysctl_createv(clog, 0, NULL, NULL,
1196: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122 atatat 1197: CTLTYPE_INT, "recvspace",
1198: SYSCTL_DESCR("Default UDP receive buffer size"),
1.114 atatat 1199: NULL, 0, &udp_recvspace, 0,
1200: CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_RECVSPACE,
1201: CTL_EOL);
1.125 thorpej 1202: sysctl_createv(clog, 0, NULL, NULL,
1203: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1204: CTLTYPE_INT, "do_loopback_cksum",
1205: SYSCTL_DESCR("Perform UDP checksum on loopback"),
1206: NULL, 0, &udp_do_loopback_cksum, 0,
1207: CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_LOOPBACKCKSUM,
1208: CTL_EOL);
1.132 atatat 1209: sysctl_createv(clog, 0, NULL, NULL,
1210: CTLFLAG_PERMANENT,
1.134 atatat 1211: CTLTYPE_STRUCT, "pcblist",
1.132 atatat 1212: SYSCTL_DESCR("UDP protocol control block list"),
1213: sysctl_inpcblist, 0, &udbtable, 0,
1214: CTL_NET, PF_INET, IPPROTO_UDP, CTL_CREATE,
1215: CTL_EOL);
1.139 elad 1216: sysctl_createv(clog, 0, NULL, NULL,
1217: CTLFLAG_PERMANENT,
1218: CTLTYPE_STRUCT, "stats",
1219: SYSCTL_DESCR("UDP statistics"),
1.166 thorpej 1220: sysctl_net_inet_udp_stats, 0, NULL, 0,
1.139 elad 1221: CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_STATS,
1222: CTL_EOL);
1.1 cgd 1223: }
1.72 itojun 1224: #endif
1.130 manu 1225:
1.166 thorpej 1226: void
1227: udp_statinc(u_int stat)
1228: {
1229:
1230: KASSERT(stat < UDP_NSTATS);
1231: UDP_STATINC(stat);
1232: }
1233:
1.190 christos 1234: #if defined(INET) && defined(IPSEC)
1.130 manu 1235: /*
1.251 maxv 1236: * Handle ESP-in-UDP packets (RFC3948).
1237: *
1238: * We need to distinguish between ESP packets and IKE packets. We do so by
1.253 maxv 1239: * looking at the Non-ESP marker. If IKE, we process the UDP packet as usual.
1240: * Otherwise, ESP, we invoke IPsec.
1.251 maxv 1241: *
1.242 maxv 1242: * Returns:
1243: * 1 if the packet was processed
1244: * 0 if normal UDP processing should take place
1245: * -1 if an error occurred and m was freed
1.130 manu 1246: */
1.242 maxv 1247: static int
1.250 maxv 1248: udp4_espinudp(struct mbuf **mp, int off, struct socket *so)
1.130 manu 1249: {
1.253 maxv 1250: const size_t skip = sizeof(struct udphdr);
1.130 manu 1251: size_t len;
1.251 maxv 1252: uint8_t *data;
1.130 manu 1253: size_t minlen;
1254: size_t iphdrlen;
1255: struct ip *ip;
1.136 manu 1256: struct m_tag *tag;
1257: struct udphdr *udphdr;
1258: u_int16_t sport, dport;
1.242 maxv 1259: struct mbuf *m = *mp;
1.253 maxv 1260: uint32_t *marker;
1.130 manu 1261:
1.254 ! maxv 1262: minlen = off + sizeof(struct esp);
1.130 manu 1263: if (minlen > m->m_pkthdr.len)
1264: minlen = m->m_pkthdr.len;
1265:
1266: if (m->m_len < minlen) {
1.242 maxv 1267: if ((*mp = m_pullup(m, minlen)) == NULL) {
1268: return -1;
1.130 manu 1269: }
1.242 maxv 1270: m = *mp;
1.130 manu 1271: }
1272:
1.131 perry 1273: len = m->m_len - off;
1.251 maxv 1274: data = mtod(m, uint8_t *) + off;
1.130 manu 1275:
1.251 maxv 1276: /* Ignore keepalive packets. */
1277: if ((len == 1) && (*data == 0xff)) {
1.242 maxv 1278: m_freem(m);
1.251 maxv 1279: *mp = NULL; /* avoid any further processing by caller */
1.242 maxv 1280: return 1;
1.130 manu 1281: }
1282:
1.251 maxv 1283: /* Handle Non-ESP marker (32bit). If zero, then IKE. */
1.253 maxv 1284: marker = (uint32_t *)data;
1285: if (len <= sizeof(uint32_t))
1286: return 0;
1287: if (marker[0] == 0)
1288: return 0;
1.130 manu 1289:
1290: /*
1.251 maxv 1291: * Get the UDP ports. They are handled in network order
1292: * everywhere in the IPSEC_NAT_T code.
1.136 manu 1293: */
1.158 christos 1294: udphdr = (struct udphdr *)((char *)data - skip);
1.136 manu 1295: sport = udphdr->uh_sport;
1296: dport = udphdr->uh_dport;
1297:
1298: /*
1.251 maxv 1299: * Remove the UDP header, plus a possible marker. IP header
1300: * length is iphdrlen.
1301: *
1.131 perry 1302: * Before:
1.130 manu 1303: * <--- off --->
1304: * +----+------+-----+
1305: * | IP | UDP | ESP |
1306: * +----+------+-----+
1307: * <-skip->
1308: * After:
1309: * +----+-----+
1310: * | IP | ESP |
1311: * +----+-----+
1312: * <-skip->
1313: */
1314: iphdrlen = off - sizeof(struct udphdr);
1.158 christos 1315: memmove(mtod(m, char *) + skip, mtod(m, void *), iphdrlen);
1.130 manu 1316: m_adj(m, skip);
1317:
1318: ip = mtod(m, struct ip *);
1319: ip->ip_len = htons(ntohs(ip->ip_len) - skip);
1320: ip->ip_p = IPPROTO_ESP;
1321:
1322: /*
1.188 christos 1323: * We have modified the packet - it is now ESP, so we should not
1.251 maxv 1324: * return to UDP processing.
1.188 christos 1325: *
1.251 maxv 1326: * Add a PACKET_TAG_IPSEC_NAT_T_PORTS tag to remember the source
1327: * UDP port. This is required if we want to select the right SPD
1328: * for multiple hosts behind same NAT.
1.136 manu 1329: */
1.137 manu 1330: if ((tag = m_tag_get(PACKET_TAG_IPSEC_NAT_T_PORTS,
1331: sizeof(sport) + sizeof(dport), M_DONTWAIT)) == NULL) {
1.242 maxv 1332: m_freem(m);
1333: return -1;
1.137 manu 1334: }
1.136 manu 1335: ((u_int16_t *)(tag + 1))[0] = sport;
1336: ((u_int16_t *)(tag + 1))[1] = dport;
1.188 christos 1337: m_tag_prepend(m, tag);
1.136 manu 1338:
1.199 christos 1339: if (ipsec_used)
1340: ipsec4_common_input(m, iphdrlen, IPPROTO_ESP);
1.237 maxv 1341: else
1342: m_freem(m);
1.130 manu 1343:
1.242 maxv 1344: /* We handled it, it shouldn't be handled by UDP */
1345: *mp = NULL; /* avoid free by caller ... */
1346: return 1;
1.130 manu 1347: }
1348: #endif
1.195 rmind 1349:
1.197 rmind 1350: PR_WRAP_USRREQS(udp)
1351: #define udp_attach udp_attach_wrapper
1352: #define udp_detach udp_detach_wrapper
1.208 rtr 1353: #define udp_accept udp_accept_wrapper
1.210 rtr 1354: #define udp_bind udp_bind_wrapper
1355: #define udp_listen udp_listen_wrapper
1.211 rtr 1356: #define udp_connect udp_connect_wrapper
1.217 rtr 1357: #define udp_connect2 udp_connect2_wrapper
1.212 rtr 1358: #define udp_disconnect udp_disconnect_wrapper
1359: #define udp_shutdown udp_shutdown_wrapper
1360: #define udp_abort udp_abort_wrapper
1.200 rtr 1361: #define udp_ioctl udp_ioctl_wrapper
1.203 rtr 1362: #define udp_stat udp_stat_wrapper
1.207 rtr 1363: #define udp_peeraddr udp_peeraddr_wrapper
1364: #define udp_sockaddr udp_sockaddr_wrapper
1.216 rtr 1365: #define udp_rcvd udp_rcvd_wrapper
1.209 rtr 1366: #define udp_recvoob udp_recvoob_wrapper
1.215 rtr 1367: #define udp_send udp_send_wrapper
1.209 rtr 1368: #define udp_sendoob udp_sendoob_wrapper
1.217 rtr 1369: #define udp_purgeif udp_purgeif_wrapper
1.195 rmind 1370:
1371: const struct pr_usrreqs udp_usrreqs = {
1.196 rmind 1372: .pr_attach = udp_attach,
1373: .pr_detach = udp_detach,
1.208 rtr 1374: .pr_accept = udp_accept,
1.210 rtr 1375: .pr_bind = udp_bind,
1376: .pr_listen = udp_listen,
1.211 rtr 1377: .pr_connect = udp_connect,
1.217 rtr 1378: .pr_connect2 = udp_connect2,
1.212 rtr 1379: .pr_disconnect = udp_disconnect,
1380: .pr_shutdown = udp_shutdown,
1381: .pr_abort = udp_abort,
1.200 rtr 1382: .pr_ioctl = udp_ioctl,
1.203 rtr 1383: .pr_stat = udp_stat,
1.207 rtr 1384: .pr_peeraddr = udp_peeraddr,
1385: .pr_sockaddr = udp_sockaddr,
1.216 rtr 1386: .pr_rcvd = udp_rcvd,
1.209 rtr 1387: .pr_recvoob = udp_recvoob,
1.215 rtr 1388: .pr_send = udp_send,
1.209 rtr 1389: .pr_sendoob = udp_sendoob,
1.217 rtr 1390: .pr_purgeif = udp_purgeif,
1.195 rmind 1391: };
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