1/* 2 * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)udp_usrreq.c 8.6 (Berkeley) 5/23/95
| 1/* 2 * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)udp_usrreq.c 8.6 (Berkeley) 5/23/95
|
34 * $FreeBSD: head/sys/netinet/udp_usrreq.c 55009 1999-12-22 19:13:38Z shin $
| 34 * $FreeBSD: head/sys/netinet/udp_usrreq.c 58698 2000-03-27 19:14:27Z jlemon $
|
35 */ 36 37#include "opt_ipsec.h" 38#include "opt_inet6.h" 39
| 35 */ 36 37#include "opt_ipsec.h" 38#include "opt_inet6.h" 39
|
| 40#include <stddef.h>
|
40#include <sys/param.h> 41#include <sys/systm.h> 42#include <sys/kernel.h> 43#include <sys/malloc.h> 44#include <sys/mbuf.h> 45#include <sys/domain.h> 46#include <sys/proc.h> 47#include <sys/protosw.h> 48#include <sys/socket.h> 49#include <sys/socketvar.h> 50#include <sys/sysctl.h> 51#include <sys/syslog.h> 52 53#include <vm/vm_zone.h> 54 55#include <net/if.h> 56#include <net/route.h> 57 58#include <netinet/in.h> 59#include <netinet/in_systm.h> 60#include <netinet/ip.h> 61#ifdef INET6 62#include <netinet/ip6.h> 63#endif 64#include <netinet/in_pcb.h> 65#include <netinet/in_var.h> 66#include <netinet/ip_var.h> 67#ifdef INET6 68#include <netinet6/ip6_var.h> 69#endif 70#include <netinet/ip_icmp.h> 71#include <netinet/icmp_var.h> 72#include <netinet/udp.h> 73#include <netinet/udp_var.h> 74 75#ifdef IPSEC 76#include <netinet6/ipsec.h> 77#endif /*IPSEC*/ 78
| 41#include <sys/param.h> 42#include <sys/systm.h> 43#include <sys/kernel.h> 44#include <sys/malloc.h> 45#include <sys/mbuf.h> 46#include <sys/domain.h> 47#include <sys/proc.h> 48#include <sys/protosw.h> 49#include <sys/socket.h> 50#include <sys/socketvar.h> 51#include <sys/sysctl.h> 52#include <sys/syslog.h> 53 54#include <vm/vm_zone.h> 55 56#include <net/if.h> 57#include <net/route.h> 58 59#include <netinet/in.h> 60#include <netinet/in_systm.h> 61#include <netinet/ip.h> 62#ifdef INET6 63#include <netinet/ip6.h> 64#endif 65#include <netinet/in_pcb.h> 66#include <netinet/in_var.h> 67#include <netinet/ip_var.h> 68#ifdef INET6 69#include <netinet6/ip6_var.h> 70#endif 71#include <netinet/ip_icmp.h> 72#include <netinet/icmp_var.h> 73#include <netinet/udp.h> 74#include <netinet/udp_var.h> 75 76#ifdef IPSEC 77#include <netinet6/ipsec.h> 78#endif /*IPSEC*/ 79
|
| 80#include <machine/in_cksum.h> 81
|
79/* 80 * UDP protocol implementation. 81 * Per RFC 768, August, 1980. 82 */ 83#ifndef COMPAT_42 84static int udpcksum = 1; 85#else 86static int udpcksum = 0; /* XXX */ 87#endif 88SYSCTL_INT(_net_inet_udp, UDPCTL_CHECKSUM, checksum, CTLFLAG_RW, 89 &udpcksum, 0, ""); 90 91int log_in_vain = 0; 92SYSCTL_INT(_net_inet_udp, OID_AUTO, log_in_vain, CTLFLAG_RW, 93 &log_in_vain, 0, "Log all incoming UDP packets"); 94 95static int blackhole = 0; 96SYSCTL_INT(_net_inet_udp, OID_AUTO, blackhole, CTLFLAG_RW, 97 &blackhole, 0, "Do not send port unreachables for refused connects"); 98 99struct inpcbhead udb; /* from udp_var.h */ 100#define udb6 udb /* for KAME src sync over BSD*'s */ 101struct inpcbinfo udbinfo; 102 103#ifndef UDBHASHSIZE 104#define UDBHASHSIZE 16 105#endif 106 107struct udpstat udpstat; /* from udp_var.h */ 108SYSCTL_STRUCT(_net_inet_udp, UDPCTL_STATS, stats, CTLFLAG_RD, 109 &udpstat, udpstat, "UDP statistics (struct udpstat, netinet/udp_var.h)"); 110 111static struct sockaddr_in udp_in = { sizeof(udp_in), AF_INET }; 112#ifdef INET6 113struct udp_in6 { 114 struct sockaddr_in6 uin6_sin; 115 u_char uin6_init_done : 1; 116} udp_in6 = { 117 { sizeof(udp_in6.uin6_sin), AF_INET6 }, 118 0 119}; 120struct udp_ip6 { 121 struct ip6_hdr uip6_ip6; 122 u_char uip6_init_done : 1; 123} udp_ip6; 124#endif /* INET6 */ 125 126static void udp_append __P((struct inpcb *last, struct ip *ip, 127 struct mbuf *n, int off)); 128#ifdef INET6 129static void ip_2_ip6_hdr __P((struct ip6_hdr *ip6, struct ip *ip)); 130#endif 131 132static int udp_detach __P((struct socket *so)); 133static int udp_output __P((struct inpcb *, struct mbuf *, struct sockaddr *, 134 struct mbuf *, struct proc *)); 135 136void 137udp_init() 138{ 139 LIST_INIT(&udb); 140 udbinfo.listhead = &udb; 141 udbinfo.hashbase = hashinit(UDBHASHSIZE, M_PCB, &udbinfo.hashmask); 142 udbinfo.porthashbase = hashinit(UDBHASHSIZE, M_PCB, 143 &udbinfo.porthashmask); 144 udbinfo.ipi_zone = zinit("udpcb", sizeof(struct inpcb), maxsockets, 145 ZONE_INTERRUPT, 0); 146} 147 148void 149udp_input(m, off, proto) 150 register struct mbuf *m; 151 int off, proto; 152{ 153 int iphlen = off; 154 register struct ip *ip; 155 register struct udphdr *uh; 156 register struct inpcb *inp; 157 struct mbuf *opts = 0; 158 int len; 159 struct ip save_ip; 160 struct sockaddr *append_sa; 161 162 udpstat.udps_ipackets++; 163 164 /* 165 * Strip IP options, if any; should skip this, 166 * make available to user, and use on returned packets, 167 * but we don't yet have a way to check the checksum 168 * with options still present. 169 */ 170 if (iphlen > sizeof (struct ip)) { 171 ip_stripoptions(m, (struct mbuf *)0); 172 iphlen = sizeof(struct ip); 173 } 174 175 /* 176 * Get IP and UDP header together in first mbuf. 177 */ 178 ip = mtod(m, struct ip *); 179 if (m->m_len < iphlen + sizeof(struct udphdr)) { 180 if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == 0) { 181 udpstat.udps_hdrops++; 182 return; 183 } 184 ip = mtod(m, struct ip *); 185 } 186 uh = (struct udphdr *)((caddr_t)ip + iphlen); 187 188 /* 189 * Make mbuf data length reflect UDP length. 190 * If not enough data to reflect UDP length, drop. 191 */ 192 len = ntohs((u_short)uh->uh_ulen); 193 if (ip->ip_len != len) { 194 if (len > ip->ip_len || len < sizeof(struct udphdr)) { 195 udpstat.udps_badlen++; 196 goto bad; 197 } 198 m_adj(m, len - ip->ip_len); 199 /* ip->ip_len = len; */ 200 } 201 /* 202 * Save a copy of the IP header in case we want restore it 203 * for sending an ICMP error message in response. 204 */ 205 save_ip = *ip; 206 207 /* 208 * Checksum extended UDP header and data. 209 */ 210 if (uh->uh_sum) {
| 82/* 83 * UDP protocol implementation. 84 * Per RFC 768, August, 1980. 85 */ 86#ifndef COMPAT_42 87static int udpcksum = 1; 88#else 89static int udpcksum = 0; /* XXX */ 90#endif 91SYSCTL_INT(_net_inet_udp, UDPCTL_CHECKSUM, checksum, CTLFLAG_RW, 92 &udpcksum, 0, ""); 93 94int log_in_vain = 0; 95SYSCTL_INT(_net_inet_udp, OID_AUTO, log_in_vain, CTLFLAG_RW, 96 &log_in_vain, 0, "Log all incoming UDP packets"); 97 98static int blackhole = 0; 99SYSCTL_INT(_net_inet_udp, OID_AUTO, blackhole, CTLFLAG_RW, 100 &blackhole, 0, "Do not send port unreachables for refused connects"); 101 102struct inpcbhead udb; /* from udp_var.h */ 103#define udb6 udb /* for KAME src sync over BSD*'s */ 104struct inpcbinfo udbinfo; 105 106#ifndef UDBHASHSIZE 107#define UDBHASHSIZE 16 108#endif 109 110struct udpstat udpstat; /* from udp_var.h */ 111SYSCTL_STRUCT(_net_inet_udp, UDPCTL_STATS, stats, CTLFLAG_RD, 112 &udpstat, udpstat, "UDP statistics (struct udpstat, netinet/udp_var.h)"); 113 114static struct sockaddr_in udp_in = { sizeof(udp_in), AF_INET }; 115#ifdef INET6 116struct udp_in6 { 117 struct sockaddr_in6 uin6_sin; 118 u_char uin6_init_done : 1; 119} udp_in6 = { 120 { sizeof(udp_in6.uin6_sin), AF_INET6 }, 121 0 122}; 123struct udp_ip6 { 124 struct ip6_hdr uip6_ip6; 125 u_char uip6_init_done : 1; 126} udp_ip6; 127#endif /* INET6 */ 128 129static void udp_append __P((struct inpcb *last, struct ip *ip, 130 struct mbuf *n, int off)); 131#ifdef INET6 132static void ip_2_ip6_hdr __P((struct ip6_hdr *ip6, struct ip *ip)); 133#endif 134 135static int udp_detach __P((struct socket *so)); 136static int udp_output __P((struct inpcb *, struct mbuf *, struct sockaddr *, 137 struct mbuf *, struct proc *)); 138 139void 140udp_init() 141{ 142 LIST_INIT(&udb); 143 udbinfo.listhead = &udb; 144 udbinfo.hashbase = hashinit(UDBHASHSIZE, M_PCB, &udbinfo.hashmask); 145 udbinfo.porthashbase = hashinit(UDBHASHSIZE, M_PCB, 146 &udbinfo.porthashmask); 147 udbinfo.ipi_zone = zinit("udpcb", sizeof(struct inpcb), maxsockets, 148 ZONE_INTERRUPT, 0); 149} 150 151void 152udp_input(m, off, proto) 153 register struct mbuf *m; 154 int off, proto; 155{ 156 int iphlen = off; 157 register struct ip *ip; 158 register struct udphdr *uh; 159 register struct inpcb *inp; 160 struct mbuf *opts = 0; 161 int len; 162 struct ip save_ip; 163 struct sockaddr *append_sa; 164 165 udpstat.udps_ipackets++; 166 167 /* 168 * Strip IP options, if any; should skip this, 169 * make available to user, and use on returned packets, 170 * but we don't yet have a way to check the checksum 171 * with options still present. 172 */ 173 if (iphlen > sizeof (struct ip)) { 174 ip_stripoptions(m, (struct mbuf *)0); 175 iphlen = sizeof(struct ip); 176 } 177 178 /* 179 * Get IP and UDP header together in first mbuf. 180 */ 181 ip = mtod(m, struct ip *); 182 if (m->m_len < iphlen + sizeof(struct udphdr)) { 183 if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == 0) { 184 udpstat.udps_hdrops++; 185 return; 186 } 187 ip = mtod(m, struct ip *); 188 } 189 uh = (struct udphdr *)((caddr_t)ip + iphlen); 190 191 /* 192 * Make mbuf data length reflect UDP length. 193 * If not enough data to reflect UDP length, drop. 194 */ 195 len = ntohs((u_short)uh->uh_ulen); 196 if (ip->ip_len != len) { 197 if (len > ip->ip_len || len < sizeof(struct udphdr)) { 198 udpstat.udps_badlen++; 199 goto bad; 200 } 201 m_adj(m, len - ip->ip_len); 202 /* ip->ip_len = len; */ 203 } 204 /* 205 * Save a copy of the IP header in case we want restore it 206 * for sending an ICMP error message in response. 207 */ 208 save_ip = *ip; 209 210 /* 211 * Checksum extended UDP header and data. 212 */ 213 if (uh->uh_sum) {
|
211 bzero(((struct ipovly *)ip)->ih_x1, 9); 212 ((struct ipovly *)ip)->ih_len = uh->uh_ulen; 213 uh->uh_sum = in_cksum(m, len + sizeof (struct ip));
| 214 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 215 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) 216 uh->uh_sum = m->m_pkthdr.csum_data; 217 else 218 uh->uh_sum = in_pseudo(ip->ip_src.s_addr, 219 ip->ip_dst.s_addr, htonl(ip->ip_len + 220 m->m_pkthdr.csum_data + IPPROTO_UDP)); 221 uh->uh_sum ^= 0xffff; 222 } else { 223 bzero(((struct ipovly *)ip)->ih_x1, 9); 224 ((struct ipovly *)ip)->ih_len = uh->uh_ulen; 225 uh->uh_sum = in_cksum(m, len + sizeof (struct ip)); 226 }
|
214 if (uh->uh_sum) { 215 udpstat.udps_badsum++; 216 m_freem(m); 217 return; 218 } 219 } 220 221 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) || 222 in_broadcast(ip->ip_dst, m->m_pkthdr.rcvif)) { 223 struct inpcb *last; 224 /* 225 * Deliver a multicast or broadcast datagram to *all* sockets 226 * for which the local and remote addresses and ports match 227 * those of the incoming datagram. This allows more than 228 * one process to receive multi/broadcasts on the same port. 229 * (This really ought to be done for unicast datagrams as 230 * well, but that would cause problems with existing 231 * applications that open both address-specific sockets and 232 * a wildcard socket listening to the same port -- they would 233 * end up receiving duplicates of every unicast datagram. 234 * Those applications open the multiple sockets to overcome an 235 * inadequacy of the UDP socket interface, but for backwards 236 * compatibility we avoid the problem here rather than 237 * fixing the interface. Maybe 4.5BSD will remedy this?) 238 */ 239 240 /* 241 * Construct sockaddr format source address. 242 */ 243 udp_in.sin_port = uh->uh_sport; 244 udp_in.sin_addr = ip->ip_src; 245 /* 246 * Locate pcb(s) for datagram. 247 * (Algorithm copied from raw_intr().) 248 */ 249 last = NULL; 250#ifdef INET6 251 udp_in6.uin6_init_done = udp_ip6.uip6_init_done = 0; 252#endif 253 LIST_FOREACH(inp, &udb, inp_list) { 254#ifdef INET6 255 if ((inp->inp_vflag & INP_IPV4) == 0) 256 continue; 257#endif 258 if (inp->inp_lport != uh->uh_dport) 259 continue; 260 if (inp->inp_laddr.s_addr != INADDR_ANY) { 261 if (inp->inp_laddr.s_addr != 262 ip->ip_dst.s_addr) 263 continue; 264 } 265 if (inp->inp_faddr.s_addr != INADDR_ANY) { 266 if (inp->inp_faddr.s_addr != 267 ip->ip_src.s_addr || 268 inp->inp_fport != uh->uh_sport) 269 continue; 270 } 271 272 if (last != NULL) { 273 struct mbuf *n; 274 275#ifdef IPSEC 276 /* check AH/ESP integrity. */ 277 if (ipsec4_in_reject_so(m, last->inp_socket)) 278 ipsecstat.in_polvio++; 279 /* do not inject data to pcb */ 280 else 281#endif /*IPSEC*/ 282 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) 283 udp_append(last, ip, n, 284 iphlen + 285 sizeof(struct udphdr)); 286 } 287 last = inp; 288 /* 289 * Don't look for additional matches if this one does 290 * not have either the SO_REUSEPORT or SO_REUSEADDR 291 * socket options set. This heuristic avoids searching 292 * through all pcbs in the common case of a non-shared 293 * port. It * assumes that an application will never 294 * clear these options after setting them. 295 */ 296 if ((last->inp_socket->so_options&(SO_REUSEPORT|SO_REUSEADDR)) == 0) 297 break; 298 } 299 300 if (last == NULL) { 301 /* 302 * No matching pcb found; discard datagram. 303 * (No need to send an ICMP Port Unreachable 304 * for a broadcast or multicast datgram.) 305 */ 306 udpstat.udps_noportbcast++; 307 goto bad; 308 } 309#ifdef IPSEC 310 /* check AH/ESP integrity. */ 311 if (ipsec4_in_reject_so(m, last->inp_socket)) { 312 ipsecstat.in_polvio++; 313 goto bad; 314 } 315#endif /*IPSEC*/ 316 udp_append(last, ip, m, iphlen + sizeof(struct udphdr)); 317 return; 318 } 319 /* 320 * Locate pcb for datagram. 321 */ 322 inp = in_pcblookup_hash(&udbinfo, ip->ip_src, uh->uh_sport, 323 ip->ip_dst, uh->uh_dport, 1, m->m_pkthdr.rcvif); 324 if (inp == NULL) { 325 if (log_in_vain) { 326 char buf[4*sizeof "123"]; 327 328 strcpy(buf, inet_ntoa(ip->ip_dst)); 329 log(LOG_INFO, 330 "Connection attempt to UDP %s:%d from %s:%d\n", 331 buf, ntohs(uh->uh_dport), inet_ntoa(ip->ip_src), 332 ntohs(uh->uh_sport)); 333 } 334 udpstat.udps_noport++; 335 if (m->m_flags & (M_BCAST | M_MCAST)) { 336 udpstat.udps_noportbcast++; 337 goto bad; 338 } 339 *ip = save_ip; 340#ifdef ICMP_BANDLIM 341 if (badport_bandlim(0) < 0) 342 goto bad; 343#endif 344 if (!blackhole) 345 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0); 346 else 347 goto bad; 348 return; 349 } 350#ifdef IPSEC 351 if (ipsec4_in_reject_so(m, inp->inp_socket)) { 352 ipsecstat.in_polvio++; 353 goto bad; 354 } 355#endif /*IPSEC*/ 356 357 /* 358 * Construct sockaddr format source address. 359 * Stuff source address and datagram in user buffer. 360 */ 361 udp_in.sin_port = uh->uh_sport; 362 udp_in.sin_addr = ip->ip_src; 363 if (inp->inp_flags & INP_CONTROLOPTS 364 || inp->inp_socket->so_options & SO_TIMESTAMP) { 365#ifdef INET6 366 if (inp->inp_vflag & INP_IPV6) { 367 int savedflags; 368 369 ip_2_ip6_hdr(&udp_ip6.uip6_ip6, ip); 370 savedflags = inp->inp_flags; 371 inp->inp_flags &= ~INP_UNMAPPABLEOPTS; 372 ip6_savecontrol(inp, &opts, &udp_ip6.uip6_ip6, m); 373 inp->inp_flags = savedflags; 374 } else 375#endif 376 ip_savecontrol(inp, &opts, ip, m); 377 } 378 iphlen += sizeof(struct udphdr); 379 m_adj(m, iphlen); 380#ifdef INET6 381 if (inp->inp_vflag & INP_IPV6) { 382 in6_sin_2_v4mapsin6(&udp_in, &udp_in6.uin6_sin); 383 append_sa = (struct sockaddr *)&udp_in6; 384 } else 385#endif 386 append_sa = (struct sockaddr *)&udp_in; 387 if (sbappendaddr(&inp->inp_socket->so_rcv, append_sa, m, opts) == 0) { 388 udpstat.udps_fullsock++; 389 goto bad; 390 } 391 sorwakeup(inp->inp_socket); 392 return; 393bad: 394 m_freem(m); 395 if (opts) 396 m_freem(opts); 397 return; 398} 399 400#if defined(INET6) 401static void 402ip_2_ip6_hdr(ip6, ip) 403 struct ip6_hdr *ip6; 404 struct ip *ip; 405{ 406 bzero(ip6, sizeof(*ip6)); 407 408 ip6->ip6_vfc = IPV6_VERSION; 409 ip6->ip6_plen = ip->ip_len; 410 ip6->ip6_nxt = ip->ip_p; 411 ip6->ip6_hlim = ip->ip_ttl; 412 ip6->ip6_src.s6_addr32[2] = ip6->ip6_dst.s6_addr32[2] = 413 IPV6_ADDR_INT32_SMP; 414 ip6->ip6_src.s6_addr32[3] = ip->ip_src.s_addr; 415 ip6->ip6_dst.s6_addr32[3] = ip->ip_dst.s_addr; 416} 417#endif 418 419/* 420 * subroutine of udp_input(), mainly for source code readability. 421 * caller must properly init udp_ip6 and udp_in6 beforehand. 422 */ 423static void 424udp_append(last, ip, n, off) 425 struct inpcb *last; 426 struct ip *ip; 427 struct mbuf *n; 428 int off; 429{ 430 struct sockaddr *append_sa; 431 struct mbuf *opts = 0; 432 433 if (last->inp_flags & INP_CONTROLOPTS || 434 last->inp_socket->so_options & SO_TIMESTAMP) { 435#ifdef INET6 436 if (last->inp_vflag & INP_IPV6) { 437 int savedflags; 438 439 if (udp_ip6.uip6_init_done == 0) { 440 ip_2_ip6_hdr(&udp_ip6.uip6_ip6, ip); 441 udp_ip6.uip6_init_done = 1; 442 } 443 savedflags = last->inp_flags; 444 last->inp_flags &= ~INP_UNMAPPABLEOPTS; 445 ip6_savecontrol(last, &opts, &udp_ip6.uip6_ip6, n); 446 last->inp_flags = savedflags; 447 } else 448#endif 449 ip_savecontrol(last, &opts, ip, n); 450 } 451#ifdef INET6 452 if (last->inp_vflag & INP_IPV6) { 453 if (udp_in6.uin6_init_done == 0) { 454 in6_sin_2_v4mapsin6(&udp_in, &udp_in6.uin6_sin); 455 udp_in6.uin6_init_done = 1; 456 } 457 append_sa = (struct sockaddr *)&udp_in6.uin6_sin; 458 } else 459#endif 460 append_sa = (struct sockaddr *)&udp_in; 461 m_adj(n, off); 462 if (sbappendaddr(&last->inp_socket->so_rcv, append_sa, n, opts) == 0) { 463 m_freem(n); 464 if (opts) 465 m_freem(opts); 466 udpstat.udps_fullsock++; 467 } else 468 sorwakeup(last->inp_socket); 469} 470 471/* 472 * Notify a udp user of an asynchronous error; 473 * just wake up so that he can collect error status. 474 */ 475void 476udp_notify(inp, errno) 477 register struct inpcb *inp; 478 int errno; 479{ 480 inp->inp_socket->so_error = errno; 481 sorwakeup(inp->inp_socket); 482 sowwakeup(inp->inp_socket); 483} 484 485void 486udp_ctlinput(cmd, sa, vip) 487 int cmd; 488 struct sockaddr *sa; 489 void *vip; 490{ 491 register struct ip *ip = vip; 492 register struct udphdr *uh; 493 494 if (!PRC_IS_REDIRECT(cmd) && 495 ((unsigned)cmd >= PRC_NCMDS || inetctlerrmap[cmd] == 0)) 496 return; 497 if (ip) { 498 uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2)); 499 in_pcbnotify(&udb, sa, uh->uh_dport, ip->ip_src, uh->uh_sport, 500 cmd, udp_notify); 501 } else 502 in_pcbnotify(&udb, sa, 0, zeroin_addr, 0, cmd, udp_notify); 503} 504 505static int 506udp_pcblist SYSCTL_HANDLER_ARGS 507{ 508 int error, i, n, s; 509 struct inpcb *inp, **inp_list; 510 inp_gen_t gencnt; 511 struct xinpgen xig; 512 513 /* 514 * The process of preparing the TCB list is too time-consuming and 515 * resource-intensive to repeat twice on every request. 516 */ 517 if (req->oldptr == 0) { 518 n = udbinfo.ipi_count; 519 req->oldidx = 2 * (sizeof xig) 520 + (n + n/8) * sizeof(struct xinpcb); 521 return 0; 522 } 523 524 if (req->newptr != 0) 525 return EPERM; 526 527 /* 528 * OK, now we're committed to doing something. 529 */ 530 s = splnet(); 531 gencnt = udbinfo.ipi_gencnt; 532 n = udbinfo.ipi_count; 533 splx(s); 534 535 xig.xig_len = sizeof xig; 536 xig.xig_count = n; 537 xig.xig_gen = gencnt; 538 xig.xig_sogen = so_gencnt; 539 error = SYSCTL_OUT(req, &xig, sizeof xig); 540 if (error) 541 return error; 542 543 inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK); 544 if (inp_list == 0) 545 return ENOMEM; 546 547 s = splnet(); 548 for (inp = udbinfo.listhead->lh_first, i = 0; inp && i < n; 549 inp = inp->inp_list.le_next) { 550 if (inp->inp_gencnt <= gencnt && !prison_xinpcb(req->p, inp)) 551 inp_list[i++] = inp; 552 } 553 splx(s); 554 n = i; 555 556 error = 0; 557 for (i = 0; i < n; i++) { 558 inp = inp_list[i]; 559 if (inp->inp_gencnt <= gencnt) { 560 struct xinpcb xi; 561 xi.xi_len = sizeof xi; 562 /* XXX should avoid extra copy */ 563 bcopy(inp, &xi.xi_inp, sizeof *inp); 564 if (inp->inp_socket) 565 sotoxsocket(inp->inp_socket, &xi.xi_socket); 566 error = SYSCTL_OUT(req, &xi, sizeof xi); 567 } 568 } 569 if (!error) { 570 /* 571 * Give the user an updated idea of our state. 572 * If the generation differs from what we told 573 * her before, she knows that something happened 574 * while we were processing this request, and it 575 * might be necessary to retry. 576 */ 577 s = splnet(); 578 xig.xig_gen = udbinfo.ipi_gencnt; 579 xig.xig_sogen = so_gencnt; 580 xig.xig_count = udbinfo.ipi_count; 581 splx(s); 582 error = SYSCTL_OUT(req, &xig, sizeof xig); 583 } 584 free(inp_list, M_TEMP); 585 return error; 586} 587 588SYSCTL_PROC(_net_inet_udp, UDPCTL_PCBLIST, pcblist, CTLFLAG_RD, 0, 0, 589 udp_pcblist, "S,xinpcb", "List of active UDP sockets"); 590 591static int 592udp_getcred SYSCTL_HANDLER_ARGS 593{ 594 struct sockaddr_in addrs[2]; 595 struct inpcb *inp; 596 int error, s; 597 598 error = suser(req->p); 599 if (error) 600 return (error); 601 error = SYSCTL_IN(req, addrs, sizeof(addrs)); 602 if (error) 603 return (error); 604 s = splnet(); 605 inp = in_pcblookup_hash(&udbinfo, addrs[1].sin_addr, addrs[1].sin_port, 606 addrs[0].sin_addr, addrs[0].sin_port, 1, NULL); 607 if (inp == NULL || inp->inp_socket == NULL) { 608 error = ENOENT; 609 goto out; 610 } 611 error = SYSCTL_OUT(req, inp->inp_socket->so_cred, sizeof(struct ucred)); 612out: 613 splx(s); 614 return (error); 615} 616 617SYSCTL_PROC(_net_inet_udp, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW, 618 0, 0, udp_getcred, "S,ucred", "Get the ucred of a UDP connection"); 619 620static int 621udp_output(inp, m, addr, control, p) 622 register struct inpcb *inp; 623 struct mbuf *m; 624 struct sockaddr *addr; 625 struct mbuf *control; 626 struct proc *p; 627{ 628 register struct udpiphdr *ui; 629 register int len = m->m_pkthdr.len; 630 struct in_addr laddr; 631 struct sockaddr_in *sin; 632 int s = 0, error = 0; 633 634 if (control) 635 m_freem(control); /* XXX */ 636 637 if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) { 638 error = EMSGSIZE; 639 goto release; 640 } 641 642 if (addr) { 643 sin = (struct sockaddr_in *)addr; 644 prison_remote_ip(p, 0, &sin->sin_addr.s_addr); 645 laddr = inp->inp_laddr; 646 if (inp->inp_faddr.s_addr != INADDR_ANY) { 647 error = EISCONN; 648 goto release; 649 } 650 /* 651 * Must block input while temporarily connected. 652 */ 653 s = splnet(); 654 error = in_pcbconnect(inp, addr, p); 655 if (error) { 656 splx(s); 657 goto release; 658 } 659 } else { 660 if (inp->inp_faddr.s_addr == INADDR_ANY) { 661 error = ENOTCONN; 662 goto release; 663 } 664 } 665 /* 666 * Calculate data length and get a mbuf 667 * for UDP and IP headers. 668 */ 669 M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT); 670 if (m == 0) { 671 error = ENOBUFS; 672 if (addr) 673 splx(s); 674 goto release; 675 } 676 677 /* 678 * Fill in mbuf with extended UDP header 679 * and addresses and length put into network format. 680 */ 681 ui = mtod(m, struct udpiphdr *);
| 227 if (uh->uh_sum) { 228 udpstat.udps_badsum++; 229 m_freem(m); 230 return; 231 } 232 } 233 234 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) || 235 in_broadcast(ip->ip_dst, m->m_pkthdr.rcvif)) { 236 struct inpcb *last; 237 /* 238 * Deliver a multicast or broadcast datagram to *all* sockets 239 * for which the local and remote addresses and ports match 240 * those of the incoming datagram. This allows more than 241 * one process to receive multi/broadcasts on the same port. 242 * (This really ought to be done for unicast datagrams as 243 * well, but that would cause problems with existing 244 * applications that open both address-specific sockets and 245 * a wildcard socket listening to the same port -- they would 246 * end up receiving duplicates of every unicast datagram. 247 * Those applications open the multiple sockets to overcome an 248 * inadequacy of the UDP socket interface, but for backwards 249 * compatibility we avoid the problem here rather than 250 * fixing the interface. Maybe 4.5BSD will remedy this?) 251 */ 252 253 /* 254 * Construct sockaddr format source address. 255 */ 256 udp_in.sin_port = uh->uh_sport; 257 udp_in.sin_addr = ip->ip_src; 258 /* 259 * Locate pcb(s) for datagram. 260 * (Algorithm copied from raw_intr().) 261 */ 262 last = NULL; 263#ifdef INET6 264 udp_in6.uin6_init_done = udp_ip6.uip6_init_done = 0; 265#endif 266 LIST_FOREACH(inp, &udb, inp_list) { 267#ifdef INET6 268 if ((inp->inp_vflag & INP_IPV4) == 0) 269 continue; 270#endif 271 if (inp->inp_lport != uh->uh_dport) 272 continue; 273 if (inp->inp_laddr.s_addr != INADDR_ANY) { 274 if (inp->inp_laddr.s_addr != 275 ip->ip_dst.s_addr) 276 continue; 277 } 278 if (inp->inp_faddr.s_addr != INADDR_ANY) { 279 if (inp->inp_faddr.s_addr != 280 ip->ip_src.s_addr || 281 inp->inp_fport != uh->uh_sport) 282 continue; 283 } 284 285 if (last != NULL) { 286 struct mbuf *n; 287 288#ifdef IPSEC 289 /* check AH/ESP integrity. */ 290 if (ipsec4_in_reject_so(m, last->inp_socket)) 291 ipsecstat.in_polvio++; 292 /* do not inject data to pcb */ 293 else 294#endif /*IPSEC*/ 295 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) 296 udp_append(last, ip, n, 297 iphlen + 298 sizeof(struct udphdr)); 299 } 300 last = inp; 301 /* 302 * Don't look for additional matches if this one does 303 * not have either the SO_REUSEPORT or SO_REUSEADDR 304 * socket options set. This heuristic avoids searching 305 * through all pcbs in the common case of a non-shared 306 * port. It * assumes that an application will never 307 * clear these options after setting them. 308 */ 309 if ((last->inp_socket->so_options&(SO_REUSEPORT|SO_REUSEADDR)) == 0) 310 break; 311 } 312 313 if (last == NULL) { 314 /* 315 * No matching pcb found; discard datagram. 316 * (No need to send an ICMP Port Unreachable 317 * for a broadcast or multicast datgram.) 318 */ 319 udpstat.udps_noportbcast++; 320 goto bad; 321 } 322#ifdef IPSEC 323 /* check AH/ESP integrity. */ 324 if (ipsec4_in_reject_so(m, last->inp_socket)) { 325 ipsecstat.in_polvio++; 326 goto bad; 327 } 328#endif /*IPSEC*/ 329 udp_append(last, ip, m, iphlen + sizeof(struct udphdr)); 330 return; 331 } 332 /* 333 * Locate pcb for datagram. 334 */ 335 inp = in_pcblookup_hash(&udbinfo, ip->ip_src, uh->uh_sport, 336 ip->ip_dst, uh->uh_dport, 1, m->m_pkthdr.rcvif); 337 if (inp == NULL) { 338 if (log_in_vain) { 339 char buf[4*sizeof "123"]; 340 341 strcpy(buf, inet_ntoa(ip->ip_dst)); 342 log(LOG_INFO, 343 "Connection attempt to UDP %s:%d from %s:%d\n", 344 buf, ntohs(uh->uh_dport), inet_ntoa(ip->ip_src), 345 ntohs(uh->uh_sport)); 346 } 347 udpstat.udps_noport++; 348 if (m->m_flags & (M_BCAST | M_MCAST)) { 349 udpstat.udps_noportbcast++; 350 goto bad; 351 } 352 *ip = save_ip; 353#ifdef ICMP_BANDLIM 354 if (badport_bandlim(0) < 0) 355 goto bad; 356#endif 357 if (!blackhole) 358 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0); 359 else 360 goto bad; 361 return; 362 } 363#ifdef IPSEC 364 if (ipsec4_in_reject_so(m, inp->inp_socket)) { 365 ipsecstat.in_polvio++; 366 goto bad; 367 } 368#endif /*IPSEC*/ 369 370 /* 371 * Construct sockaddr format source address. 372 * Stuff source address and datagram in user buffer. 373 */ 374 udp_in.sin_port = uh->uh_sport; 375 udp_in.sin_addr = ip->ip_src; 376 if (inp->inp_flags & INP_CONTROLOPTS 377 || inp->inp_socket->so_options & SO_TIMESTAMP) { 378#ifdef INET6 379 if (inp->inp_vflag & INP_IPV6) { 380 int savedflags; 381 382 ip_2_ip6_hdr(&udp_ip6.uip6_ip6, ip); 383 savedflags = inp->inp_flags; 384 inp->inp_flags &= ~INP_UNMAPPABLEOPTS; 385 ip6_savecontrol(inp, &opts, &udp_ip6.uip6_ip6, m); 386 inp->inp_flags = savedflags; 387 } else 388#endif 389 ip_savecontrol(inp, &opts, ip, m); 390 } 391 iphlen += sizeof(struct udphdr); 392 m_adj(m, iphlen); 393#ifdef INET6 394 if (inp->inp_vflag & INP_IPV6) { 395 in6_sin_2_v4mapsin6(&udp_in, &udp_in6.uin6_sin); 396 append_sa = (struct sockaddr *)&udp_in6; 397 } else 398#endif 399 append_sa = (struct sockaddr *)&udp_in; 400 if (sbappendaddr(&inp->inp_socket->so_rcv, append_sa, m, opts) == 0) { 401 udpstat.udps_fullsock++; 402 goto bad; 403 } 404 sorwakeup(inp->inp_socket); 405 return; 406bad: 407 m_freem(m); 408 if (opts) 409 m_freem(opts); 410 return; 411} 412 413#if defined(INET6) 414static void 415ip_2_ip6_hdr(ip6, ip) 416 struct ip6_hdr *ip6; 417 struct ip *ip; 418{ 419 bzero(ip6, sizeof(*ip6)); 420 421 ip6->ip6_vfc = IPV6_VERSION; 422 ip6->ip6_plen = ip->ip_len; 423 ip6->ip6_nxt = ip->ip_p; 424 ip6->ip6_hlim = ip->ip_ttl; 425 ip6->ip6_src.s6_addr32[2] = ip6->ip6_dst.s6_addr32[2] = 426 IPV6_ADDR_INT32_SMP; 427 ip6->ip6_src.s6_addr32[3] = ip->ip_src.s_addr; 428 ip6->ip6_dst.s6_addr32[3] = ip->ip_dst.s_addr; 429} 430#endif 431 432/* 433 * subroutine of udp_input(), mainly for source code readability. 434 * caller must properly init udp_ip6 and udp_in6 beforehand. 435 */ 436static void 437udp_append(last, ip, n, off) 438 struct inpcb *last; 439 struct ip *ip; 440 struct mbuf *n; 441 int off; 442{ 443 struct sockaddr *append_sa; 444 struct mbuf *opts = 0; 445 446 if (last->inp_flags & INP_CONTROLOPTS || 447 last->inp_socket->so_options & SO_TIMESTAMP) { 448#ifdef INET6 449 if (last->inp_vflag & INP_IPV6) { 450 int savedflags; 451 452 if (udp_ip6.uip6_init_done == 0) { 453 ip_2_ip6_hdr(&udp_ip6.uip6_ip6, ip); 454 udp_ip6.uip6_init_done = 1; 455 } 456 savedflags = last->inp_flags; 457 last->inp_flags &= ~INP_UNMAPPABLEOPTS; 458 ip6_savecontrol(last, &opts, &udp_ip6.uip6_ip6, n); 459 last->inp_flags = savedflags; 460 } else 461#endif 462 ip_savecontrol(last, &opts, ip, n); 463 } 464#ifdef INET6 465 if (last->inp_vflag & INP_IPV6) { 466 if (udp_in6.uin6_init_done == 0) { 467 in6_sin_2_v4mapsin6(&udp_in, &udp_in6.uin6_sin); 468 udp_in6.uin6_init_done = 1; 469 } 470 append_sa = (struct sockaddr *)&udp_in6.uin6_sin; 471 } else 472#endif 473 append_sa = (struct sockaddr *)&udp_in; 474 m_adj(n, off); 475 if (sbappendaddr(&last->inp_socket->so_rcv, append_sa, n, opts) == 0) { 476 m_freem(n); 477 if (opts) 478 m_freem(opts); 479 udpstat.udps_fullsock++; 480 } else 481 sorwakeup(last->inp_socket); 482} 483 484/* 485 * Notify a udp user of an asynchronous error; 486 * just wake up so that he can collect error status. 487 */ 488void 489udp_notify(inp, errno) 490 register struct inpcb *inp; 491 int errno; 492{ 493 inp->inp_socket->so_error = errno; 494 sorwakeup(inp->inp_socket); 495 sowwakeup(inp->inp_socket); 496} 497 498void 499udp_ctlinput(cmd, sa, vip) 500 int cmd; 501 struct sockaddr *sa; 502 void *vip; 503{ 504 register struct ip *ip = vip; 505 register struct udphdr *uh; 506 507 if (!PRC_IS_REDIRECT(cmd) && 508 ((unsigned)cmd >= PRC_NCMDS || inetctlerrmap[cmd] == 0)) 509 return; 510 if (ip) { 511 uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2)); 512 in_pcbnotify(&udb, sa, uh->uh_dport, ip->ip_src, uh->uh_sport, 513 cmd, udp_notify); 514 } else 515 in_pcbnotify(&udb, sa, 0, zeroin_addr, 0, cmd, udp_notify); 516} 517 518static int 519udp_pcblist SYSCTL_HANDLER_ARGS 520{ 521 int error, i, n, s; 522 struct inpcb *inp, **inp_list; 523 inp_gen_t gencnt; 524 struct xinpgen xig; 525 526 /* 527 * The process of preparing the TCB list is too time-consuming and 528 * resource-intensive to repeat twice on every request. 529 */ 530 if (req->oldptr == 0) { 531 n = udbinfo.ipi_count; 532 req->oldidx = 2 * (sizeof xig) 533 + (n + n/8) * sizeof(struct xinpcb); 534 return 0; 535 } 536 537 if (req->newptr != 0) 538 return EPERM; 539 540 /* 541 * OK, now we're committed to doing something. 542 */ 543 s = splnet(); 544 gencnt = udbinfo.ipi_gencnt; 545 n = udbinfo.ipi_count; 546 splx(s); 547 548 xig.xig_len = sizeof xig; 549 xig.xig_count = n; 550 xig.xig_gen = gencnt; 551 xig.xig_sogen = so_gencnt; 552 error = SYSCTL_OUT(req, &xig, sizeof xig); 553 if (error) 554 return error; 555 556 inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK); 557 if (inp_list == 0) 558 return ENOMEM; 559 560 s = splnet(); 561 for (inp = udbinfo.listhead->lh_first, i = 0; inp && i < n; 562 inp = inp->inp_list.le_next) { 563 if (inp->inp_gencnt <= gencnt && !prison_xinpcb(req->p, inp)) 564 inp_list[i++] = inp; 565 } 566 splx(s); 567 n = i; 568 569 error = 0; 570 for (i = 0; i < n; i++) { 571 inp = inp_list[i]; 572 if (inp->inp_gencnt <= gencnt) { 573 struct xinpcb xi; 574 xi.xi_len = sizeof xi; 575 /* XXX should avoid extra copy */ 576 bcopy(inp, &xi.xi_inp, sizeof *inp); 577 if (inp->inp_socket) 578 sotoxsocket(inp->inp_socket, &xi.xi_socket); 579 error = SYSCTL_OUT(req, &xi, sizeof xi); 580 } 581 } 582 if (!error) { 583 /* 584 * Give the user an updated idea of our state. 585 * If the generation differs from what we told 586 * her before, she knows that something happened 587 * while we were processing this request, and it 588 * might be necessary to retry. 589 */ 590 s = splnet(); 591 xig.xig_gen = udbinfo.ipi_gencnt; 592 xig.xig_sogen = so_gencnt; 593 xig.xig_count = udbinfo.ipi_count; 594 splx(s); 595 error = SYSCTL_OUT(req, &xig, sizeof xig); 596 } 597 free(inp_list, M_TEMP); 598 return error; 599} 600 601SYSCTL_PROC(_net_inet_udp, UDPCTL_PCBLIST, pcblist, CTLFLAG_RD, 0, 0, 602 udp_pcblist, "S,xinpcb", "List of active UDP sockets"); 603 604static int 605udp_getcred SYSCTL_HANDLER_ARGS 606{ 607 struct sockaddr_in addrs[2]; 608 struct inpcb *inp; 609 int error, s; 610 611 error = suser(req->p); 612 if (error) 613 return (error); 614 error = SYSCTL_IN(req, addrs, sizeof(addrs)); 615 if (error) 616 return (error); 617 s = splnet(); 618 inp = in_pcblookup_hash(&udbinfo, addrs[1].sin_addr, addrs[1].sin_port, 619 addrs[0].sin_addr, addrs[0].sin_port, 1, NULL); 620 if (inp == NULL || inp->inp_socket == NULL) { 621 error = ENOENT; 622 goto out; 623 } 624 error = SYSCTL_OUT(req, inp->inp_socket->so_cred, sizeof(struct ucred)); 625out: 626 splx(s); 627 return (error); 628} 629 630SYSCTL_PROC(_net_inet_udp, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW, 631 0, 0, udp_getcred, "S,ucred", "Get the ucred of a UDP connection"); 632 633static int 634udp_output(inp, m, addr, control, p) 635 register struct inpcb *inp; 636 struct mbuf *m; 637 struct sockaddr *addr; 638 struct mbuf *control; 639 struct proc *p; 640{ 641 register struct udpiphdr *ui; 642 register int len = m->m_pkthdr.len; 643 struct in_addr laddr; 644 struct sockaddr_in *sin; 645 int s = 0, error = 0; 646 647 if (control) 648 m_freem(control); /* XXX */ 649 650 if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) { 651 error = EMSGSIZE; 652 goto release; 653 } 654 655 if (addr) { 656 sin = (struct sockaddr_in *)addr; 657 prison_remote_ip(p, 0, &sin->sin_addr.s_addr); 658 laddr = inp->inp_laddr; 659 if (inp->inp_faddr.s_addr != INADDR_ANY) { 660 error = EISCONN; 661 goto release; 662 } 663 /* 664 * Must block input while temporarily connected. 665 */ 666 s = splnet(); 667 error = in_pcbconnect(inp, addr, p); 668 if (error) { 669 splx(s); 670 goto release; 671 } 672 } else { 673 if (inp->inp_faddr.s_addr == INADDR_ANY) { 674 error = ENOTCONN; 675 goto release; 676 } 677 } 678 /* 679 * Calculate data length and get a mbuf 680 * for UDP and IP headers. 681 */ 682 M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT); 683 if (m == 0) { 684 error = ENOBUFS; 685 if (addr) 686 splx(s); 687 goto release; 688 } 689 690 /* 691 * Fill in mbuf with extended UDP header 692 * and addresses and length put into network format. 693 */ 694 ui = mtod(m, struct udpiphdr *);
|
682 bzero(ui->ui_x1, sizeof(ui->ui_x1));
| 695 bzero(ui->ui_x1, sizeof(ui->ui_x1)); /* XXX still needed? */
|
683 ui->ui_pr = IPPROTO_UDP;
| 696 ui->ui_pr = IPPROTO_UDP;
|
684 ui->ui_len = htons((u_short)len + sizeof (struct udphdr));
| |
685 ui->ui_src = inp->inp_laddr; 686 ui->ui_dst = inp->inp_faddr; 687 ui->ui_sport = inp->inp_lport; 688 ui->ui_dport = inp->inp_fport;
| 697 ui->ui_src = inp->inp_laddr; 698 ui->ui_dst = inp->inp_faddr; 699 ui->ui_sport = inp->inp_lport; 700 ui->ui_dport = inp->inp_fport;
|
689 ui->ui_ulen = ui->ui_len;
| 701 ui->ui_ulen = htons((u_short)len + sizeof(struct udphdr));
|
690 691 /*
| 702 703 /*
|
692 * Stuff checksum and output datagram.
| 704 * Set up checksum and output datagram.
|
693 */
| 705 */
|
694 ui->ui_sum = 0;
| |
695 if (udpcksum) {
| 706 if (udpcksum) {
|
696 if ((ui->ui_sum = in_cksum(m, sizeof (struct udpiphdr) + len)) == 0) 697 ui->ui_sum = 0xffff;
| 707 ui->ui_sum = in_pseudo(ui->ui_src.s_addr, ui->ui_dst.s_addr, 708 htons((u_short)len + sizeof(struct udphdr) + IPPROTO_UDP)); 709 m->m_pkthdr.csum_flags = CSUM_UDP; 710 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); 711 } else { 712 ui->ui_sum = 0;
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698 } 699 ((struct ip *)ui)->ip_len = sizeof (struct udpiphdr) + len; 700 ((struct ip *)ui)->ip_ttl = inp->inp_ip_ttl; /* XXX */ 701 ((struct ip *)ui)->ip_tos = inp->inp_ip_tos; /* XXX */ 702 udpstat.udps_opackets++; 703 704#ifdef IPSEC 705 m->m_pkthdr.rcvif = (struct ifnet *)inp->inp_socket; 706#endif /*IPSEC*/ 707 708 error = ip_output(m, inp->inp_options, &inp->inp_route, 709 (inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST)) 710 | IP_SOCKINMRCVIF, 711 inp->inp_moptions); 712 713 if (addr) { 714 in_pcbdisconnect(inp); 715 inp->inp_laddr = laddr; /* XXX rehash? */ 716 splx(s); 717 } 718 return (error); 719 720release: 721 m_freem(m); 722 return (error); 723} 724 725u_long udp_sendspace = 9216; /* really max datagram size */ 726 /* 40 1K datagrams */ 727SYSCTL_INT(_net_inet_udp, UDPCTL_MAXDGRAM, maxdgram, CTLFLAG_RW, 728 &udp_sendspace, 0, "Maximum outgoing UDP datagram size"); 729 730u_long udp_recvspace = 40 * (1024 + 731#ifdef INET6 732 sizeof(struct sockaddr_in6) 733#else 734 sizeof(struct sockaddr_in) 735#endif 736 ); 737SYSCTL_INT(_net_inet_udp, UDPCTL_RECVSPACE, recvspace, CTLFLAG_RW, 738 &udp_recvspace, 0, "Maximum incoming UDP datagram size"); 739 740static int 741udp_abort(struct socket *so) 742{ 743 struct inpcb *inp; 744 int s; 745 746 inp = sotoinpcb(so); 747 if (inp == 0) 748 return EINVAL; /* ??? possible? panic instead? */ 749 soisdisconnected(so); 750 s = splnet(); 751 in_pcbdetach(inp); 752 splx(s); 753 return 0; 754} 755 756static int 757udp_attach(struct socket *so, int proto, struct proc *p) 758{ 759 struct inpcb *inp; 760 int s, error; 761 762 inp = sotoinpcb(so); 763 if (inp != 0) 764 return EINVAL; 765 766 error = soreserve(so, udp_sendspace, udp_recvspace); 767 if (error) 768 return error; 769 s = splnet(); 770 error = in_pcballoc(so, &udbinfo, p); 771 splx(s); 772 if (error) 773 return error; 774 775 inp = (struct inpcb *)so->so_pcb; 776 inp->inp_vflag |= INP_IPV4; 777 inp->inp_ip_ttl = ip_defttl; 778#ifdef IPSEC 779 error = ipsec_init_policy(so, &inp->inp_sp); 780 if (error != 0) { 781 in_pcbdetach(inp); 782 return error; 783 } 784#endif /*IPSEC*/ 785 return 0; 786} 787 788static int 789udp_bind(struct socket *so, struct sockaddr *nam, struct proc *p) 790{ 791 struct inpcb *inp; 792 int s, error; 793 794 inp = sotoinpcb(so); 795 if (inp == 0) 796 return EINVAL; 797 s = splnet(); 798 error = in_pcbbind(inp, nam, p); 799 splx(s); 800 return error; 801} 802 803static int 804udp_connect(struct socket *so, struct sockaddr *nam, struct proc *p) 805{ 806 struct inpcb *inp; 807 int s, error; 808 struct sockaddr_in *sin; 809 810 inp = sotoinpcb(so); 811 if (inp == 0) 812 return EINVAL; 813 if (inp->inp_faddr.s_addr != INADDR_ANY) 814 return EISCONN; 815 s = splnet(); 816 sin = (struct sockaddr_in *)nam; 817 prison_remote_ip(p, 0, &sin->sin_addr.s_addr); 818 error = in_pcbconnect(inp, nam, p); 819 splx(s); 820 if (error == 0) 821 soisconnected(so); 822 return error; 823} 824 825static int 826udp_detach(struct socket *so) 827{ 828 struct inpcb *inp; 829 int s; 830 831 inp = sotoinpcb(so); 832 if (inp == 0) 833 return EINVAL; 834 s = splnet(); 835 in_pcbdetach(inp); 836 splx(s); 837 return 0; 838} 839 840static int 841udp_disconnect(struct socket *so) 842{ 843 struct inpcb *inp; 844 int s; 845 846 inp = sotoinpcb(so); 847 if (inp == 0) 848 return EINVAL; 849 if (inp->inp_faddr.s_addr == INADDR_ANY) 850 return ENOTCONN; 851 852 s = splnet(); 853 in_pcbdisconnect(inp); 854 inp->inp_laddr.s_addr = INADDR_ANY; 855 splx(s); 856 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 857 return 0; 858} 859 860static int 861udp_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, 862 struct mbuf *control, struct proc *p) 863{ 864 struct inpcb *inp; 865 866 inp = sotoinpcb(so); 867 if (inp == 0) { 868 m_freem(m); 869 return EINVAL; 870 } 871 return udp_output(inp, m, addr, control, p); 872} 873 874int 875udp_shutdown(struct socket *so) 876{ 877 struct inpcb *inp; 878 879 inp = sotoinpcb(so); 880 if (inp == 0) 881 return EINVAL; 882 socantsendmore(so); 883 return 0; 884} 885 886struct pr_usrreqs udp_usrreqs = { 887 udp_abort, pru_accept_notsupp, udp_attach, udp_bind, udp_connect, 888 pru_connect2_notsupp, in_control, udp_detach, udp_disconnect, 889 pru_listen_notsupp, in_setpeeraddr, pru_rcvd_notsupp, 890 pru_rcvoob_notsupp, udp_send, pru_sense_null, udp_shutdown, 891 in_setsockaddr, sosend, soreceive, sopoll 892}; 893
| 713 } 714 ((struct ip *)ui)->ip_len = sizeof (struct udpiphdr) + len; 715 ((struct ip *)ui)->ip_ttl = inp->inp_ip_ttl; /* XXX */ 716 ((struct ip *)ui)->ip_tos = inp->inp_ip_tos; /* XXX */ 717 udpstat.udps_opackets++; 718 719#ifdef IPSEC 720 m->m_pkthdr.rcvif = (struct ifnet *)inp->inp_socket; 721#endif /*IPSEC*/ 722 723 error = ip_output(m, inp->inp_options, &inp->inp_route, 724 (inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST)) 725 | IP_SOCKINMRCVIF, 726 inp->inp_moptions); 727 728 if (addr) { 729 in_pcbdisconnect(inp); 730 inp->inp_laddr = laddr; /* XXX rehash? */ 731 splx(s); 732 } 733 return (error); 734 735release: 736 m_freem(m); 737 return (error); 738} 739 740u_long udp_sendspace = 9216; /* really max datagram size */ 741 /* 40 1K datagrams */ 742SYSCTL_INT(_net_inet_udp, UDPCTL_MAXDGRAM, maxdgram, CTLFLAG_RW, 743 &udp_sendspace, 0, "Maximum outgoing UDP datagram size"); 744 745u_long udp_recvspace = 40 * (1024 + 746#ifdef INET6 747 sizeof(struct sockaddr_in6) 748#else 749 sizeof(struct sockaddr_in) 750#endif 751 ); 752SYSCTL_INT(_net_inet_udp, UDPCTL_RECVSPACE, recvspace, CTLFLAG_RW, 753 &udp_recvspace, 0, "Maximum incoming UDP datagram size"); 754 755static int 756udp_abort(struct socket *so) 757{ 758 struct inpcb *inp; 759 int s; 760 761 inp = sotoinpcb(so); 762 if (inp == 0) 763 return EINVAL; /* ??? possible? panic instead? */ 764 soisdisconnected(so); 765 s = splnet(); 766 in_pcbdetach(inp); 767 splx(s); 768 return 0; 769} 770 771static int 772udp_attach(struct socket *so, int proto, struct proc *p) 773{ 774 struct inpcb *inp; 775 int s, error; 776 777 inp = sotoinpcb(so); 778 if (inp != 0) 779 return EINVAL; 780 781 error = soreserve(so, udp_sendspace, udp_recvspace); 782 if (error) 783 return error; 784 s = splnet(); 785 error = in_pcballoc(so, &udbinfo, p); 786 splx(s); 787 if (error) 788 return error; 789 790 inp = (struct inpcb *)so->so_pcb; 791 inp->inp_vflag |= INP_IPV4; 792 inp->inp_ip_ttl = ip_defttl; 793#ifdef IPSEC 794 error = ipsec_init_policy(so, &inp->inp_sp); 795 if (error != 0) { 796 in_pcbdetach(inp); 797 return error; 798 } 799#endif /*IPSEC*/ 800 return 0; 801} 802 803static int 804udp_bind(struct socket *so, struct sockaddr *nam, struct proc *p) 805{ 806 struct inpcb *inp; 807 int s, error; 808 809 inp = sotoinpcb(so); 810 if (inp == 0) 811 return EINVAL; 812 s = splnet(); 813 error = in_pcbbind(inp, nam, p); 814 splx(s); 815 return error; 816} 817 818static int 819udp_connect(struct socket *so, struct sockaddr *nam, struct proc *p) 820{ 821 struct inpcb *inp; 822 int s, error; 823 struct sockaddr_in *sin; 824 825 inp = sotoinpcb(so); 826 if (inp == 0) 827 return EINVAL; 828 if (inp->inp_faddr.s_addr != INADDR_ANY) 829 return EISCONN; 830 s = splnet(); 831 sin = (struct sockaddr_in *)nam; 832 prison_remote_ip(p, 0, &sin->sin_addr.s_addr); 833 error = in_pcbconnect(inp, nam, p); 834 splx(s); 835 if (error == 0) 836 soisconnected(so); 837 return error; 838} 839 840static int 841udp_detach(struct socket *so) 842{ 843 struct inpcb *inp; 844 int s; 845 846 inp = sotoinpcb(so); 847 if (inp == 0) 848 return EINVAL; 849 s = splnet(); 850 in_pcbdetach(inp); 851 splx(s); 852 return 0; 853} 854 855static int 856udp_disconnect(struct socket *so) 857{ 858 struct inpcb *inp; 859 int s; 860 861 inp = sotoinpcb(so); 862 if (inp == 0) 863 return EINVAL; 864 if (inp->inp_faddr.s_addr == INADDR_ANY) 865 return ENOTCONN; 866 867 s = splnet(); 868 in_pcbdisconnect(inp); 869 inp->inp_laddr.s_addr = INADDR_ANY; 870 splx(s); 871 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 872 return 0; 873} 874 875static int 876udp_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, 877 struct mbuf *control, struct proc *p) 878{ 879 struct inpcb *inp; 880 881 inp = sotoinpcb(so); 882 if (inp == 0) { 883 m_freem(m); 884 return EINVAL; 885 } 886 return udp_output(inp, m, addr, control, p); 887} 888 889int 890udp_shutdown(struct socket *so) 891{ 892 struct inpcb *inp; 893 894 inp = sotoinpcb(so); 895 if (inp == 0) 896 return EINVAL; 897 socantsendmore(so); 898 return 0; 899} 900 901struct pr_usrreqs udp_usrreqs = { 902 udp_abort, pru_accept_notsupp, udp_attach, udp_bind, udp_connect, 903 pru_connect2_notsupp, in_control, udp_detach, udp_disconnect, 904 pru_listen_notsupp, in_setpeeraddr, pru_rcvd_notsupp, 905 pru_rcvoob_notsupp, udp_send, pru_sense_null, udp_shutdown, 906 in_setsockaddr, sosend, soreceive, sopoll 907}; 908
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