| 1 |
30 |
unneback |
/*
|
| 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 |
|
|
* $Id: udp_usrreq.c,v 1.2 2001-09-27 12:01:56 chris Exp $
|
| 35 |
|
|
*/
|
| 36 |
|
|
|
| 37 |
|
|
#include <sys/param.h>
|
| 38 |
|
|
#include <sys/queue.h>
|
| 39 |
|
|
#include <sys/systm.h>
|
| 40 |
|
|
#include <sys/malloc.h>
|
| 41 |
|
|
#include <sys/mbuf.h>
|
| 42 |
|
|
#include <sys/protosw.h>
|
| 43 |
|
|
#include <sys/socket.h>
|
| 44 |
|
|
#include <sys/socketvar.h>
|
| 45 |
|
|
#include <sys/errno.h>
|
| 46 |
|
|
#include <sys/stat.h>
|
| 47 |
|
|
#include <sys/kernel.h>
|
| 48 |
|
|
#include <sys/sysctl.h>
|
| 49 |
|
|
#include <sys/syslog.h>
|
| 50 |
|
|
|
| 51 |
|
|
#include <net/if.h>
|
| 52 |
|
|
#include <net/route.h>
|
| 53 |
|
|
|
| 54 |
|
|
#include <netinet/in.h>
|
| 55 |
|
|
#include <netinet/in_systm.h>
|
| 56 |
|
|
#include <netinet/ip.h>
|
| 57 |
|
|
#include <netinet/in_pcb.h>
|
| 58 |
|
|
#include <netinet/in_var.h>
|
| 59 |
|
|
#include <netinet/ip_var.h>
|
| 60 |
|
|
#include <netinet/ip_icmp.h>
|
| 61 |
|
|
#include <netinet/udp.h>
|
| 62 |
|
|
#include <netinet/udp_var.h>
|
| 63 |
|
|
|
| 64 |
|
|
/*
|
| 65 |
|
|
* UDP protocol implementation.
|
| 66 |
|
|
* Per RFC 768, August, 1980.
|
| 67 |
|
|
*/
|
| 68 |
|
|
#ifndef COMPAT_42
|
| 69 |
|
|
static int udpcksum = 1;
|
| 70 |
|
|
#else
|
| 71 |
|
|
static int udpcksum = 0; /* XXX */
|
| 72 |
|
|
#endif
|
| 73 |
|
|
SYSCTL_INT(_net_inet_udp, UDPCTL_CHECKSUM, checksum, CTLFLAG_RW,
|
| 74 |
|
|
&udpcksum, 0, "");
|
| 75 |
|
|
|
| 76 |
|
|
static int log_in_vain = 0;
|
| 77 |
|
|
SYSCTL_INT(_net_inet_udp, OID_AUTO, log_in_vain, CTLFLAG_RW,
|
| 78 |
|
|
&log_in_vain, 0, "");
|
| 79 |
|
|
|
| 80 |
|
|
static struct inpcbhead udb; /* from udp_var.h */
|
| 81 |
|
|
static struct inpcbinfo udbinfo;
|
| 82 |
|
|
|
| 83 |
|
|
#ifndef UDBHASHSIZE
|
| 84 |
|
|
#define UDBHASHSIZE 64
|
| 85 |
|
|
#endif
|
| 86 |
|
|
|
| 87 |
|
|
struct udpstat udpstat; /* from udp_var.h */
|
| 88 |
|
|
SYSCTL_STRUCT(_net_inet_udp, UDPCTL_STATS, stats, CTLFLAG_RD,
|
| 89 |
|
|
&udpstat, udpstat, "");
|
| 90 |
|
|
|
| 91 |
|
|
static struct sockaddr_in udp_in = { sizeof(udp_in), AF_INET };
|
| 92 |
|
|
|
| 93 |
|
|
static void udp_detach __P((struct inpcb *));
|
| 94 |
|
|
static int udp_output __P((struct inpcb *, struct mbuf *, struct mbuf *,
|
| 95 |
|
|
struct mbuf *));
|
| 96 |
|
|
static void udp_notify __P((struct inpcb *, int));
|
| 97 |
|
|
|
| 98 |
|
|
void
|
| 99 |
|
|
udp_init()
|
| 100 |
|
|
{
|
| 101 |
|
|
LIST_INIT(&udb);
|
| 102 |
|
|
udbinfo.listhead = &udb;
|
| 103 |
|
|
udbinfo.hashbase = hashinit(UDBHASHSIZE, M_PCB, &udbinfo.hashmask);
|
| 104 |
|
|
}
|
| 105 |
|
|
|
| 106 |
|
|
void
|
| 107 |
|
|
udp_input(m, iphlen)
|
| 108 |
|
|
register struct mbuf *m;
|
| 109 |
|
|
int iphlen;
|
| 110 |
|
|
{
|
| 111 |
|
|
register struct ip *ip;
|
| 112 |
|
|
register struct udphdr *uh;
|
| 113 |
|
|
register struct inpcb *inp;
|
| 114 |
|
|
struct mbuf *opts = 0;
|
| 115 |
|
|
int len;
|
| 116 |
|
|
struct ip save_ip;
|
| 117 |
|
|
|
| 118 |
|
|
udpstat.udps_ipackets++;
|
| 119 |
|
|
|
| 120 |
|
|
/*
|
| 121 |
|
|
* Strip IP options, if any; should skip this,
|
| 122 |
|
|
* make available to user, and use on returned packets,
|
| 123 |
|
|
* but we don't yet have a way to check the checksum
|
| 124 |
|
|
* with options still present.
|
| 125 |
|
|
*/
|
| 126 |
|
|
if (iphlen > sizeof (struct ip)) {
|
| 127 |
|
|
ip_stripoptions(m, (struct mbuf *)0);
|
| 128 |
|
|
iphlen = sizeof(struct ip);
|
| 129 |
|
|
}
|
| 130 |
|
|
|
| 131 |
|
|
/*
|
| 132 |
|
|
* Get IP and UDP header together in first mbuf.
|
| 133 |
|
|
*/
|
| 134 |
|
|
ip = mtod(m, struct ip *);
|
| 135 |
|
|
if (m->m_len < iphlen + sizeof(struct udphdr)) {
|
| 136 |
|
|
if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == 0) {
|
| 137 |
|
|
udpstat.udps_hdrops++;
|
| 138 |
|
|
return;
|
| 139 |
|
|
}
|
| 140 |
|
|
ip = mtod(m, struct ip *);
|
| 141 |
|
|
}
|
| 142 |
|
|
uh = (struct udphdr *)((caddr_t)ip + iphlen);
|
| 143 |
|
|
|
| 144 |
|
|
/*
|
| 145 |
|
|
* Make mbuf data length reflect UDP length.
|
| 146 |
|
|
* If not enough data to reflect UDP length, drop.
|
| 147 |
|
|
*/
|
| 148 |
|
|
len = ntohs((u_short)uh->uh_ulen);
|
| 149 |
|
|
if (ip->ip_len != len) {
|
| 150 |
|
|
if (len > ip->ip_len || len < sizeof(struct udphdr)) {
|
| 151 |
|
|
udpstat.udps_badlen++;
|
| 152 |
|
|
goto bad;
|
| 153 |
|
|
}
|
| 154 |
|
|
m_adj(m, len - ip->ip_len);
|
| 155 |
|
|
/* ip->ip_len = len; */
|
| 156 |
|
|
}
|
| 157 |
|
|
/*
|
| 158 |
|
|
* Save a copy of the IP header in case we want restore it
|
| 159 |
|
|
* for sending an ICMP error message in response.
|
| 160 |
|
|
*/
|
| 161 |
|
|
save_ip = *ip;
|
| 162 |
|
|
|
| 163 |
|
|
/*
|
| 164 |
|
|
* Checksum extended UDP header and data.
|
| 165 |
|
|
*/
|
| 166 |
|
|
if (uh->uh_sum) {
|
| 167 |
|
|
((struct ipovly *)ip)->ih_next = 0;
|
| 168 |
|
|
((struct ipovly *)ip)->ih_prev = 0;
|
| 169 |
|
|
((struct ipovly *)ip)->ih_x1 = 0;
|
| 170 |
|
|
((struct ipovly *)ip)->ih_len = uh->uh_ulen;
|
| 171 |
|
|
uh->uh_sum = in_cksum(m, len + sizeof (struct ip));
|
| 172 |
|
|
if (uh->uh_sum) {
|
| 173 |
|
|
udpstat.udps_badsum++;
|
| 174 |
|
|
m_freem(m);
|
| 175 |
|
|
return;
|
| 176 |
|
|
}
|
| 177 |
|
|
}
|
| 178 |
|
|
|
| 179 |
|
|
if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) ||
|
| 180 |
|
|
in_broadcast(ip->ip_dst, m->m_pkthdr.rcvif)) {
|
| 181 |
|
|
struct inpcb *last;
|
| 182 |
|
|
/*
|
| 183 |
|
|
* Deliver a multicast or broadcast datagram to *all* sockets
|
| 184 |
|
|
* for which the local and remote addresses and ports match
|
| 185 |
|
|
* those of the incoming datagram. This allows more than
|
| 186 |
|
|
* one process to receive multi/broadcasts on the same port.
|
| 187 |
|
|
* (This really ought to be done for unicast datagrams as
|
| 188 |
|
|
* well, but that would cause problems with existing
|
| 189 |
|
|
* applications that open both address-specific sockets and
|
| 190 |
|
|
* a wildcard socket listening to the same port -- they would
|
| 191 |
|
|
* end up receiving duplicates of every unicast datagram.
|
| 192 |
|
|
* Those applications open the multiple sockets to overcome an
|
| 193 |
|
|
* inadequacy of the UDP socket interface, but for backwards
|
| 194 |
|
|
* compatibility we avoid the problem here rather than
|
| 195 |
|
|
* fixing the interface. Maybe 4.5BSD will remedy this?)
|
| 196 |
|
|
*/
|
| 197 |
|
|
|
| 198 |
|
|
/*
|
| 199 |
|
|
* Construct sockaddr format source address.
|
| 200 |
|
|
*/
|
| 201 |
|
|
udp_in.sin_port = uh->uh_sport;
|
| 202 |
|
|
udp_in.sin_addr = ip->ip_src;
|
| 203 |
|
|
m->m_len -= sizeof (struct udpiphdr);
|
| 204 |
|
|
m->m_data += sizeof (struct udpiphdr);
|
| 205 |
|
|
/*
|
| 206 |
|
|
* Locate pcb(s) for datagram.
|
| 207 |
|
|
* (Algorithm copied from raw_intr().)
|
| 208 |
|
|
*/
|
| 209 |
|
|
last = NULL;
|
| 210 |
|
|
for (inp = udb.lh_first; inp != NULL; inp = inp->inp_list.le_next) {
|
| 211 |
|
|
if (inp->inp_lport != uh->uh_dport)
|
| 212 |
|
|
continue;
|
| 213 |
|
|
if (inp->inp_laddr.s_addr != INADDR_ANY) {
|
| 214 |
|
|
if (inp->inp_laddr.s_addr !=
|
| 215 |
|
|
ip->ip_dst.s_addr)
|
| 216 |
|
|
continue;
|
| 217 |
|
|
}
|
| 218 |
|
|
if (inp->inp_faddr.s_addr != INADDR_ANY) {
|
| 219 |
|
|
if (inp->inp_faddr.s_addr !=
|
| 220 |
|
|
ip->ip_src.s_addr ||
|
| 221 |
|
|
inp->inp_fport != uh->uh_sport)
|
| 222 |
|
|
continue;
|
| 223 |
|
|
}
|
| 224 |
|
|
|
| 225 |
|
|
if (last != NULL) {
|
| 226 |
|
|
struct mbuf *n;
|
| 227 |
|
|
|
| 228 |
|
|
if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
|
| 229 |
|
|
if (last->inp_flags & INP_CONTROLOPTS
|
| 230 |
|
|
|| last->inp_socket->so_options & SO_TIMESTAMP)
|
| 231 |
|
|
ip_savecontrol(last, &opts, ip, n);
|
| 232 |
|
|
if (sbappendaddr(&last->inp_socket->so_rcv,
|
| 233 |
|
|
(struct sockaddr *)&udp_in,
|
| 234 |
|
|
n, opts) == 0) {
|
| 235 |
|
|
m_freem(n);
|
| 236 |
|
|
if (opts)
|
| 237 |
|
|
m_freem(opts);
|
| 238 |
|
|
udpstat.udps_fullsock++;
|
| 239 |
|
|
} else
|
| 240 |
|
|
sorwakeup(last->inp_socket);
|
| 241 |
|
|
opts = 0;
|
| 242 |
|
|
}
|
| 243 |
|
|
}
|
| 244 |
|
|
last = inp;
|
| 245 |
|
|
/*
|
| 246 |
|
|
* Don't look for additional matches if this one does
|
| 247 |
|
|
* not have either the SO_REUSEPORT or SO_REUSEADDR
|
| 248 |
|
|
* socket options set. This heuristic avoids searching
|
| 249 |
|
|
* through all pcbs in the common case of a non-shared
|
| 250 |
|
|
* port. It * assumes that an application will never
|
| 251 |
|
|
* clear these options after setting them.
|
| 252 |
|
|
*/
|
| 253 |
|
|
if (((last->inp_socket->so_options&(SO_REUSEPORT|SO_REUSEADDR)) == 0))
|
| 254 |
|
|
break;
|
| 255 |
|
|
}
|
| 256 |
|
|
|
| 257 |
|
|
if (last == NULL) {
|
| 258 |
|
|
/*
|
| 259 |
|
|
* No matching pcb found; discard datagram.
|
| 260 |
|
|
* (No need to send an ICMP Port Unreachable
|
| 261 |
|
|
* for a broadcast or multicast datgram.)
|
| 262 |
|
|
*/
|
| 263 |
|
|
udpstat.udps_noportbcast++;
|
| 264 |
|
|
goto bad;
|
| 265 |
|
|
}
|
| 266 |
|
|
if (last->inp_flags & INP_CONTROLOPTS
|
| 267 |
|
|
|| last->inp_socket->so_options & SO_TIMESTAMP)
|
| 268 |
|
|
ip_savecontrol(last, &opts, ip, m);
|
| 269 |
|
|
if (sbappendaddr(&last->inp_socket->so_rcv,
|
| 270 |
|
|
(struct sockaddr *)&udp_in,
|
| 271 |
|
|
m, opts) == 0) {
|
| 272 |
|
|
udpstat.udps_fullsock++;
|
| 273 |
|
|
goto bad;
|
| 274 |
|
|
}
|
| 275 |
|
|
sorwakeup(last->inp_socket);
|
| 276 |
|
|
return;
|
| 277 |
|
|
}
|
| 278 |
|
|
/*
|
| 279 |
|
|
* Locate pcb for datagram.
|
| 280 |
|
|
*/
|
| 281 |
|
|
inp = in_pcblookuphash(&udbinfo, ip->ip_src, uh->uh_sport,
|
| 282 |
|
|
ip->ip_dst, uh->uh_dport, 1);
|
| 283 |
|
|
if (inp == NULL) {
|
| 284 |
|
|
if (log_in_vain) {
|
| 285 |
|
|
char buf[4*sizeof "123"];
|
| 286 |
|
|
|
| 287 |
|
|
strcpy(buf, inet_ntoa(ip->ip_dst));
|
| 288 |
|
|
log(LOG_INFO, "Connection attempt to UDP %s:%d"
|
| 289 |
|
|
" from %s:%d\n",
|
| 290 |
|
|
buf, ntohs(uh->uh_dport),
|
| 291 |
|
|
inet_ntoa(ip->ip_src), ntohs(uh->uh_sport));
|
| 292 |
|
|
}
|
| 293 |
|
|
udpstat.udps_noport++;
|
| 294 |
|
|
if (m->m_flags & (M_BCAST | M_MCAST)) {
|
| 295 |
|
|
udpstat.udps_noportbcast++;
|
| 296 |
|
|
goto bad;
|
| 297 |
|
|
}
|
| 298 |
|
|
*ip = save_ip;
|
| 299 |
|
|
icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
|
| 300 |
|
|
return;
|
| 301 |
|
|
}
|
| 302 |
|
|
|
| 303 |
|
|
/*
|
| 304 |
|
|
* Construct sockaddr format source address.
|
| 305 |
|
|
* Stuff source address and datagram in user buffer.
|
| 306 |
|
|
*/
|
| 307 |
|
|
udp_in.sin_port = uh->uh_sport;
|
| 308 |
|
|
udp_in.sin_addr = ip->ip_src;
|
| 309 |
|
|
if (inp->inp_flags & INP_CONTROLOPTS
|
| 310 |
|
|
|| inp->inp_socket->so_options & SO_TIMESTAMP)
|
| 311 |
|
|
ip_savecontrol(inp, &opts, ip, m);
|
| 312 |
|
|
iphlen += sizeof(struct udphdr);
|
| 313 |
|
|
m->m_len -= iphlen;
|
| 314 |
|
|
m->m_pkthdr.len -= iphlen;
|
| 315 |
|
|
m->m_data += iphlen;
|
| 316 |
|
|
if (sbappendaddr(&inp->inp_socket->so_rcv, (struct sockaddr *)&udp_in,
|
| 317 |
|
|
m, opts) == 0) {
|
| 318 |
|
|
udpstat.udps_fullsock++;
|
| 319 |
|
|
goto bad;
|
| 320 |
|
|
}
|
| 321 |
|
|
sorwakeup(inp->inp_socket);
|
| 322 |
|
|
return;
|
| 323 |
|
|
bad:
|
| 324 |
|
|
m_freem(m);
|
| 325 |
|
|
if (opts)
|
| 326 |
|
|
m_freem(opts);
|
| 327 |
|
|
}
|
| 328 |
|
|
|
| 329 |
|
|
/*
|
| 330 |
|
|
* Notify a udp user of an asynchronous error;
|
| 331 |
|
|
* just wake up so that he can collect error status.
|
| 332 |
|
|
*/
|
| 333 |
|
|
static void
|
| 334 |
|
|
udp_notify(inp, errnum)
|
| 335 |
|
|
register struct inpcb *inp;
|
| 336 |
|
|
int errnum;
|
| 337 |
|
|
{
|
| 338 |
|
|
inp->inp_socket->so_error = errnum;
|
| 339 |
|
|
sorwakeup(inp->inp_socket);
|
| 340 |
|
|
sowwakeup(inp->inp_socket);
|
| 341 |
|
|
}
|
| 342 |
|
|
|
| 343 |
|
|
void
|
| 344 |
|
|
udp_ctlinput(cmd, sa, vip)
|
| 345 |
|
|
int cmd;
|
| 346 |
|
|
struct sockaddr *sa;
|
| 347 |
|
|
void *vip;
|
| 348 |
|
|
{
|
| 349 |
|
|
register struct ip *ip = vip;
|
| 350 |
|
|
register struct udphdr *uh;
|
| 351 |
|
|
|
| 352 |
|
|
if (!PRC_IS_REDIRECT(cmd) &&
|
| 353 |
|
|
((unsigned)cmd >= PRC_NCMDS || inetctlerrmap[cmd] == 0))
|
| 354 |
|
|
return;
|
| 355 |
|
|
if (ip) {
|
| 356 |
|
|
uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
|
| 357 |
|
|
in_pcbnotify(&udb, sa, uh->uh_dport, ip->ip_src, uh->uh_sport,
|
| 358 |
|
|
cmd, udp_notify);
|
| 359 |
|
|
} else
|
| 360 |
|
|
in_pcbnotify(&udb, sa, 0, zeroin_addr, 0, cmd, udp_notify);
|
| 361 |
|
|
}
|
| 362 |
|
|
|
| 363 |
|
|
static int
|
| 364 |
|
|
udp_output(inp, m, addr, control)
|
| 365 |
|
|
register struct inpcb *inp;
|
| 366 |
|
|
register struct mbuf *m;
|
| 367 |
|
|
struct mbuf *addr, *control;
|
| 368 |
|
|
{
|
| 369 |
|
|
register struct udpiphdr *ui;
|
| 370 |
|
|
register int len = m->m_pkthdr.len;
|
| 371 |
|
|
struct in_addr laddr;
|
| 372 |
|
|
int s = 0, error = 0;
|
| 373 |
|
|
|
| 374 |
|
|
if (control)
|
| 375 |
|
|
m_freem(control); /* XXX */
|
| 376 |
|
|
|
| 377 |
|
|
if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) {
|
| 378 |
|
|
error = EMSGSIZE;
|
| 379 |
|
|
goto release;
|
| 380 |
|
|
}
|
| 381 |
|
|
|
| 382 |
|
|
if (addr) {
|
| 383 |
|
|
laddr = inp->inp_laddr;
|
| 384 |
|
|
if (inp->inp_faddr.s_addr != INADDR_ANY) {
|
| 385 |
|
|
error = EISCONN;
|
| 386 |
|
|
goto release;
|
| 387 |
|
|
}
|
| 388 |
|
|
/*
|
| 389 |
|
|
* Must block input while temporarily connected.
|
| 390 |
|
|
*/
|
| 391 |
|
|
s = splnet();
|
| 392 |
|
|
error = in_pcbconnect(inp, addr);
|
| 393 |
|
|
if (error) {
|
| 394 |
|
|
splx(s);
|
| 395 |
|
|
goto release;
|
| 396 |
|
|
}
|
| 397 |
|
|
} else {
|
| 398 |
|
|
if (inp->inp_faddr.s_addr == INADDR_ANY) {
|
| 399 |
|
|
error = ENOTCONN;
|
| 400 |
|
|
goto release;
|
| 401 |
|
|
}
|
| 402 |
|
|
}
|
| 403 |
|
|
/*
|
| 404 |
|
|
* Calculate data length and get a mbuf
|
| 405 |
|
|
* for UDP and IP headers.
|
| 406 |
|
|
*/
|
| 407 |
|
|
M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT);
|
| 408 |
|
|
if (m == 0) {
|
| 409 |
|
|
error = ENOBUFS;
|
| 410 |
|
|
if (addr)
|
| 411 |
|
|
splx(s);
|
| 412 |
|
|
goto release;
|
| 413 |
|
|
}
|
| 414 |
|
|
|
| 415 |
|
|
/*
|
| 416 |
|
|
* Fill in mbuf with extended UDP header
|
| 417 |
|
|
* and addresses and length put into network format.
|
| 418 |
|
|
*/
|
| 419 |
|
|
ui = mtod(m, struct udpiphdr *);
|
| 420 |
|
|
ui->ui_next = ui->ui_prev = 0;
|
| 421 |
|
|
ui->ui_x1 = 0;
|
| 422 |
|
|
ui->ui_pr = IPPROTO_UDP;
|
| 423 |
|
|
ui->ui_len = htons((u_short)len + sizeof (struct udphdr));
|
| 424 |
|
|
ui->ui_src = inp->inp_laddr;
|
| 425 |
|
|
ui->ui_dst = inp->inp_faddr;
|
| 426 |
|
|
ui->ui_sport = inp->inp_lport;
|
| 427 |
|
|
ui->ui_dport = inp->inp_fport;
|
| 428 |
|
|
ui->ui_ulen = ui->ui_len;
|
| 429 |
|
|
|
| 430 |
|
|
/*
|
| 431 |
|
|
* Stuff checksum and output datagram.
|
| 432 |
|
|
*/
|
| 433 |
|
|
ui->ui_sum = 0;
|
| 434 |
|
|
if (udpcksum) {
|
| 435 |
|
|
if ((ui->ui_sum = in_cksum(m, sizeof (struct udpiphdr) + len)) == 0)
|
| 436 |
|
|
ui->ui_sum = 0xffff;
|
| 437 |
|
|
}
|
| 438 |
|
|
((struct ip *)ui)->ip_len = sizeof (struct udpiphdr) + len;
|
| 439 |
|
|
((struct ip *)ui)->ip_ttl = inp->inp_ip_ttl; /* XXX */
|
| 440 |
|
|
((struct ip *)ui)->ip_tos = inp->inp_ip_tos; /* XXX */
|
| 441 |
|
|
udpstat.udps_opackets++;
|
| 442 |
|
|
error = ip_output(m, inp->inp_options, &inp->inp_route,
|
| 443 |
|
|
inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST),
|
| 444 |
|
|
inp->inp_moptions);
|
| 445 |
|
|
|
| 446 |
|
|
if (addr) {
|
| 447 |
|
|
in_pcbdisconnect(inp);
|
| 448 |
|
|
inp->inp_laddr = laddr;
|
| 449 |
|
|
splx(s);
|
| 450 |
|
|
}
|
| 451 |
|
|
return (error);
|
| 452 |
|
|
|
| 453 |
|
|
release:
|
| 454 |
|
|
m_freem(m);
|
| 455 |
|
|
return (error);
|
| 456 |
|
|
}
|
| 457 |
|
|
|
| 458 |
|
|
static u_long udp_sendspace = 9216; /* really max datagram size */
|
| 459 |
|
|
/* 40 1K datagrams */
|
| 460 |
|
|
SYSCTL_INT(_net_inet_udp, UDPCTL_MAXDGRAM, maxdgram, CTLFLAG_RW,
|
| 461 |
|
|
&udp_sendspace, 0, "");
|
| 462 |
|
|
|
| 463 |
|
|
static u_long udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in));
|
| 464 |
|
|
SYSCTL_INT(_net_inet_udp, UDPCTL_RECVSPACE, recvspace, CTLFLAG_RW,
|
| 465 |
|
|
&udp_recvspace, 0, "");
|
| 466 |
|
|
|
| 467 |
|
|
/*ARGSUSED*/
|
| 468 |
|
|
int
|
| 469 |
|
|
udp_usrreq(so, req, m, addr, control)
|
| 470 |
|
|
struct socket *so;
|
| 471 |
|
|
int req;
|
| 472 |
|
|
struct mbuf *m, *addr, *control;
|
| 473 |
|
|
{
|
| 474 |
|
|
struct inpcb *inp = sotoinpcb(so);
|
| 475 |
|
|
int error = 0;
|
| 476 |
|
|
int s;
|
| 477 |
|
|
|
| 478 |
|
|
if (req == PRU_CONTROL)
|
| 479 |
|
|
return (in_control(so, (u_long)m, (caddr_t)addr,
|
| 480 |
|
|
(struct ifnet *)control));
|
| 481 |
|
|
if (inp == NULL && req != PRU_ATTACH) {
|
| 482 |
|
|
error = EINVAL;
|
| 483 |
|
|
goto release;
|
| 484 |
|
|
}
|
| 485 |
|
|
/*
|
| 486 |
|
|
* Note: need to block udp_input while changing
|
| 487 |
|
|
* the udp pcb queue and/or pcb addresses.
|
| 488 |
|
|
*/
|
| 489 |
|
|
switch (req) {
|
| 490 |
|
|
|
| 491 |
|
|
case PRU_ATTACH:
|
| 492 |
|
|
if (inp != NULL) {
|
| 493 |
|
|
error = EINVAL;
|
| 494 |
|
|
break;
|
| 495 |
|
|
}
|
| 496 |
|
|
s = splnet();
|
| 497 |
|
|
error = in_pcballoc(so, &udbinfo);
|
| 498 |
|
|
splx(s);
|
| 499 |
|
|
if (error)
|
| 500 |
|
|
break;
|
| 501 |
|
|
error = soreserve(so, udp_sendspace, udp_recvspace);
|
| 502 |
|
|
if (error)
|
| 503 |
|
|
break;
|
| 504 |
|
|
((struct inpcb *) so->so_pcb)->inp_ip_ttl = ip_defttl;
|
| 505 |
|
|
break;
|
| 506 |
|
|
|
| 507 |
|
|
case PRU_DETACH:
|
| 508 |
|
|
udp_detach(inp);
|
| 509 |
|
|
break;
|
| 510 |
|
|
|
| 511 |
|
|
case PRU_BIND:
|
| 512 |
|
|
s = splnet();
|
| 513 |
|
|
error = in_pcbbind(inp, addr);
|
| 514 |
|
|
splx(s);
|
| 515 |
|
|
break;
|
| 516 |
|
|
|
| 517 |
|
|
case PRU_LISTEN:
|
| 518 |
|
|
error = EOPNOTSUPP;
|
| 519 |
|
|
break;
|
| 520 |
|
|
|
| 521 |
|
|
case PRU_CONNECT:
|
| 522 |
|
|
if (inp->inp_faddr.s_addr != INADDR_ANY) {
|
| 523 |
|
|
error = EISCONN;
|
| 524 |
|
|
break;
|
| 525 |
|
|
}
|
| 526 |
|
|
s = splnet();
|
| 527 |
|
|
error = in_pcbconnect(inp, addr);
|
| 528 |
|
|
splx(s);
|
| 529 |
|
|
if (error == 0)
|
| 530 |
|
|
soisconnected(so);
|
| 531 |
|
|
break;
|
| 532 |
|
|
|
| 533 |
|
|
case PRU_CONNECT2:
|
| 534 |
|
|
error = EOPNOTSUPP;
|
| 535 |
|
|
break;
|
| 536 |
|
|
|
| 537 |
|
|
case PRU_ACCEPT:
|
| 538 |
|
|
error = EOPNOTSUPP;
|
| 539 |
|
|
break;
|
| 540 |
|
|
|
| 541 |
|
|
case PRU_DISCONNECT:
|
| 542 |
|
|
if (inp->inp_faddr.s_addr == INADDR_ANY) {
|
| 543 |
|
|
error = ENOTCONN;
|
| 544 |
|
|
break;
|
| 545 |
|
|
}
|
| 546 |
|
|
s = splnet();
|
| 547 |
|
|
in_pcbdisconnect(inp);
|
| 548 |
|
|
inp->inp_laddr.s_addr = INADDR_ANY;
|
| 549 |
|
|
splx(s);
|
| 550 |
|
|
so->so_state &= ~SS_ISCONNECTED; /* XXX */
|
| 551 |
|
|
break;
|
| 552 |
|
|
|
| 553 |
|
|
case PRU_SHUTDOWN:
|
| 554 |
|
|
socantsendmore(so);
|
| 555 |
|
|
break;
|
| 556 |
|
|
|
| 557 |
|
|
case PRU_SEND:
|
| 558 |
|
|
return (udp_output(inp, m, addr, control));
|
| 559 |
|
|
|
| 560 |
|
|
case PRU_ABORT:
|
| 561 |
|
|
soisdisconnected(so);
|
| 562 |
|
|
udp_detach(inp);
|
| 563 |
|
|
break;
|
| 564 |
|
|
|
| 565 |
|
|
case PRU_SOCKADDR:
|
| 566 |
|
|
in_setsockaddr(inp, addr);
|
| 567 |
|
|
break;
|
| 568 |
|
|
|
| 569 |
|
|
case PRU_PEERADDR:
|
| 570 |
|
|
in_setpeeraddr(inp, addr);
|
| 571 |
|
|
break;
|
| 572 |
|
|
|
| 573 |
|
|
case PRU_SENSE:
|
| 574 |
|
|
/*
|
| 575 |
|
|
* stat: don't bother with a blocksize.
|
| 576 |
|
|
*/
|
| 577 |
|
|
return (0);
|
| 578 |
|
|
|
| 579 |
|
|
case PRU_SENDOOB:
|
| 580 |
|
|
case PRU_FASTTIMO:
|
| 581 |
|
|
case PRU_SLOWTIMO:
|
| 582 |
|
|
case PRU_PROTORCV:
|
| 583 |
|
|
case PRU_PROTOSEND:
|
| 584 |
|
|
error = EOPNOTSUPP;
|
| 585 |
|
|
break;
|
| 586 |
|
|
|
| 587 |
|
|
case PRU_RCVD:
|
| 588 |
|
|
case PRU_RCVOOB:
|
| 589 |
|
|
return (EOPNOTSUPP); /* do not free mbuf's */
|
| 590 |
|
|
|
| 591 |
|
|
default:
|
| 592 |
|
|
panic("udp_usrreq");
|
| 593 |
|
|
}
|
| 594 |
|
|
|
| 595 |
|
|
release:
|
| 596 |
|
|
if (control) {
|
| 597 |
|
|
printf("udp control data unexpectedly retained\n");
|
| 598 |
|
|
m_freem(control);
|
| 599 |
|
|
}
|
| 600 |
|
|
if (m)
|
| 601 |
|
|
m_freem(m);
|
| 602 |
|
|
return (error);
|
| 603 |
|
|
}
|
| 604 |
|
|
|
| 605 |
|
|
static void
|
| 606 |
|
|
udp_detach(inp)
|
| 607 |
|
|
struct inpcb *inp;
|
| 608 |
|
|
{
|
| 609 |
|
|
int s = splnet();
|
| 610 |
|
|
|
| 611 |
|
|
in_pcbdetach(inp);
|
| 612 |
|
|
splx(s);
|
| 613 |
|
|
}
|
