sys/net/raw_usrreq.c

   1 /*
   2  * Copyright (c) 1980, 1986, 1993
   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. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  *      @(#)raw_usrreq.c        8.1 (Berkeley) 6/10/93
  30  * $FreeBSD: src/sys/net/raw_usrreq.c,v 1.18 1999/08/28 00:48:28 peter Exp $
  31  */
  32
  33 #include <sys/param.h>
  34 #include <sys/systm.h>
  35 #include <sys/malloc.h>
  36 #include <sys/mbuf.h>
  37 #include <sys/proc.h>
  38 #include <sys/priv.h>
  39 #include <sys/protosw.h>
  40 #include <sys/socket.h>
  41 #include <sys/socketvar.h>
  42
  43 #include <sys/socketvar2.h>
  44 #include <sys/msgport2.h>
  45
  46 #include <net/raw_cb.h>
  47 #include <net/netisr2.h>
  48
  49 /*
  50  * Except from the raw_init(), rest of interfaces must be called
  51  * from netisr0.
  52  */
  53
  54 /*
  55  * Initialize raw connection block q.
  56  */
  57 void
  58 raw_init(void)
  59 {
  60         LIST_INIT(&rawcb_list);
  61 }
  62
  63 /************************************************************************
  64  *                       RAW PROTOCOL INTERFACE                         *
  65  ************************************************************************/
  66
  67 /*
  68  * Raw protocol input routine.  Find the socket associated with the packet(s)
  69  * and move them over.  If nothing exists for this packet, drop it.  This
  70  * routine is indirect called via rts_input() and will be serialized on
  71  * cpu 0.
  72  *
  73  * Most other raw protocol interface functions are also serialized XXX.
  74  */
  75 void
  76 raw_input(struct mbuf *m0, const struct sockproto *proto,
  77           const struct sockaddr *src, const struct sockaddr *dst,
  78           const struct rawcb *skip)
  79 {
  80         struct rawcb *rp;
  81         struct mbuf *m = m0;
  82         struct socket *last;
  83
  84         ASSERT_NETISR0;
  85
  86         last = NULL;
  87
  88         LIST_FOREACH(rp, &rawcb_list, list) {
  89                 if (rp == skip)
  90                         continue;
  91                 if (rp->rcb_proto.sp_family != proto->sp_family)
  92                         continue;
  93                 if (rp->rcb_proto.sp_protocol  &&
  94                     rp->rcb_proto.sp_protocol != proto->sp_protocol)
  95                         continue;
  96                 /*
  97                  * We assume the lower level routines have
  98                  * placed the address in a canonical format
  99                  * suitable for a structure comparison.
 100                  *
 101                  * Note that if the lengths are not the same
 102                  * the comparison will fail at the first byte.
 103                  */
 104                 if (rp->rcb_laddr && !sa_equal(rp->rcb_laddr, dst))
 105                         continue;
 106                 if (rp->rcb_faddr && !sa_equal(rp->rcb_faddr, src))
 107                         continue;
 108                 /* Run any filtering that may have been installed. */
 109                 if (rp->rcb_filter != NULL && rp->rcb_filter(m, proto, rp) != 0)
 110                         continue;
 111                 if (last) {
 112                         struct mbuf *n;
 113
 114                         n = m_copypacket(m, M_NOWAIT);
 115                         if (n != NULL) {
 116                                 lwkt_gettoken(&last->so_rcv.ssb_token);
 117                                 if (ssb_appendaddr(&last->so_rcv, src, n,
 118                                                  NULL) == 0) {
 119                                         m_freem(n);
 120                                         soroverflow(last);
 121                                 } else {
 122                                         sorwakeup(last);
 123                                 }
 124                                 lwkt_reltoken(&last->so_rcv.ssb_token);
 125                         }
 126                 }
 127                 last = rp->rcb_socket;
 128         }
 129         if (last) {
 130                 lwkt_gettoken(&last->so_rcv.ssb_token);
 131                 if (ssb_appendaddr(&last->so_rcv, src, m, NULL) == 0) {
 132                         m_freem(m);
 133                         soroverflow(last);
 134                 } else
 135                         sorwakeup(last);
 136                 lwkt_reltoken(&last->so_rcv.ssb_token);
 137         } else {
 138                 m_freem(m);
 139         }
 140 }
 141
 142 /*
 143  * nm_cmd, nm_arg, nm_extra
 144  */
 145 void
 146 raw_ctlinput(netmsg_t msg)
 147 {
 148         int error = 0;
 149
 150         ASSERT_NETISR0;
 151
 152         if (msg->ctlinput.nm_cmd < 0 || msg->ctlinput.nm_cmd > PRC_NCMDS) {
 153                 ; /* no-op */
 154         }
 155         lwkt_replymsg(&msg->lmsg, error);
 156 }
 157
 158 /*
 159  * NOTE: (so) is referenced from soabort*() and netmsg_pru_abort()
 160  *       will sofree() it when we return.
 161  */
 162 static void
 163 raw_uabort(netmsg_t msg)
 164 {
 165         struct rawcb *rp = sotorawcb(msg->base.nm_so);
 166         int error;
 167
 168         ASSERT_NETISR0;
 169
 170         if (rp) {
 171                 raw_disconnect(rp);
 172                 soisdisconnected(msg->base.nm_so);
 173                 error = 0;
 174         } else {
 175                 error = EINVAL;
 176         }
 177         lwkt_replymsg(&msg->lmsg, error);
 178 }
 179
 180 /* pru_accept is EOPNOTSUPP */
 181
 182 static void
 183 raw_uattach(netmsg_t msg)
 184 {
 185         struct socket *so = msg->base.nm_so;
 186         int proto = msg->attach.nm_proto;
 187         struct pru_attach_info *ai = msg->attach.nm_ai;
 188         struct rawcb *rp;
 189         int error;
 190
 191         ASSERT_NETISR0;
 192
 193         rp = sotorawcb(so);
 194         if (rp) {
 195                 error = priv_check_cred(ai->p_ucred, PRIV_ROOT, NULL_CRED_OKAY);
 196                 if (error == 0)
 197                         error = raw_attach(so, proto, ai->sb_rlimit);
 198         } else {
 199                 error = EINVAL;
 200         }
 201         lwkt_replymsg(&msg->lmsg, error);
 202 }
 203
 204 static void
 205 raw_ubind(netmsg_t msg)
 206 {
 207         ASSERT_NETISR0;
 208         lwkt_replymsg(&msg->lmsg, EINVAL);
 209 }
 210
 211 static void
 212 raw_uconnect(netmsg_t msg)
 213 {
 214         ASSERT_NETISR0;
 215         lwkt_replymsg(&msg->lmsg, EINVAL);
 216 }
 217
 218 /* pru_connect2 is EOPNOTSUPP */
 219 /* pru_control is EOPNOTSUPP */
 220
 221 static void
 222 raw_udetach(netmsg_t msg)
 223 {
 224         struct rawcb *rp = sotorawcb(msg->base.nm_so);
 225         int error;
 226
 227         ASSERT_NETISR0;
 228
 229         if (rp) {
 230                 raw_detach(rp);
 231                 error = 0;
 232         } else {
 233                 error = EINVAL;
 234         }
 235         lwkt_replymsg(&msg->lmsg, error);
 236 }
 237
 238 static void
 239 raw_udisconnect(netmsg_t msg)
 240 {
 241         struct socket *so = msg->base.nm_so;
 242         struct rawcb *rp;
 243         int error;
 244
 245         ASSERT_NETISR0;
 246
 247         rp = sotorawcb(so);
 248         if (rp == NULL) {
 249                 error = EINVAL;
 250         } else if (rp->rcb_faddr == NULL) {
 251                 error = ENOTCONN;
 252         } else {
 253                 soreference(so);
 254                 raw_disconnect(rp);
 255                 soisdisconnected(so);
 256                 sofree(so);
 257                 error = 0;
 258         }
 259         lwkt_replymsg(&msg->lmsg, error);
 260 }
 261
 262 /* pru_listen is EOPNOTSUPP */
 263
 264 static void
 265 raw_upeeraddr(netmsg_t msg)
 266 {
 267         struct rawcb *rp = sotorawcb(msg->base.nm_so);
 268         int error;
 269
 270         ASSERT_NETISR0;
 271
 272         if (rp == NULL) {
 273                 error = EINVAL;
 274         } else if (rp->rcb_faddr == NULL) {
 275                 error = ENOTCONN;
 276         } else {
 277                 *msg->peeraddr.nm_nam = dup_sockaddr(rp->rcb_faddr);
 278                 error = 0;
 279         }
 280         lwkt_replymsg(&msg->lmsg, error);
 281 }
 282
 283 /* pru_rcvd is EOPNOTSUPP */
 284 /* pru_rcvoob is EOPNOTSUPP */
 285
 286 static void
 287 raw_usend(netmsg_t msg)
 288 {
 289         struct socket *so = msg->base.nm_so;
 290         struct mbuf *m = msg->send.nm_m;
 291         struct mbuf *control = msg->send.nm_control;
 292         struct rawcb *rp = sotorawcb(so);
 293         struct pr_output_info oi;
 294         int flags = msg->send.nm_flags;
 295         int error;
 296
 297         ASSERT_NETISR0;
 298
 299         if (rp == NULL) {
 300                 error = EINVAL;
 301                 goto release;
 302         }
 303
 304         if (flags & PRUS_OOB) {
 305                 error = EOPNOTSUPP;
 306                 goto release;
 307         }
 308
 309         if (control && control->m_len) {
 310                 error = EOPNOTSUPP;
 311                 goto release;
 312         }
 313         if (msg->send.nm_addr) {
 314                 if (rp->rcb_faddr) {
 315                         error = EISCONN;
 316                         goto release;
 317                 }
 318                 rp->rcb_faddr = msg->send.nm_addr;
 319         } else if (rp->rcb_faddr == NULL) {
 320                 error = ENOTCONN;
 321                 goto release;
 322         }
 323         oi.p_pid = msg->send.nm_td->td_proc->p_pid;
 324         error = (*so->so_proto->pr_output)(m, so, &oi);
 325         m = NULL;
 326         if (msg->send.nm_addr)
 327                 rp->rcb_faddr = NULL;
 328 release:
 329         if (m != NULL)
 330                 m_freem(m);
 331         lwkt_replymsg(&msg->lmsg, error);
 332 }
 333
 334 /* pru_sense is null */
 335
 336 static void
 337 raw_ushutdown(netmsg_t msg)
 338 {
 339         struct rawcb *rp = sotorawcb(msg->base.nm_so);
 340         int error;
 341
 342         ASSERT_NETISR0;
 343
 344         if (rp) {
 345                 socantsendmore(msg->base.nm_so);
 346                 error = 0;
 347         } else {
 348                 error = EINVAL;
 349         }
 350         lwkt_replymsg(&msg->lmsg, error);
 351 }
 352
 353 static void
 354 raw_usockaddr(netmsg_t msg)
 355 {
 356         struct rawcb *rp = sotorawcb(msg->base.nm_so);
 357         int error;
 358
 359         ASSERT_NETISR0;
 360
 361         if (rp == NULL) {
 362                 error = EINVAL;
 363         } else if (rp->rcb_laddr == NULL) {
 364                 error = EINVAL;
 365         } else {
 366                 *msg->sockaddr.nm_nam = dup_sockaddr(rp->rcb_laddr);
 367                 error = 0;
 368         }
 369         lwkt_replymsg(&msg->lmsg, error);
 370 }
 371
 372 struct pr_usrreqs raw_usrreqs = {
 373         .pru_abort = raw_uabort,
 374         .pru_accept = pr_generic_notsupp,
 375         .pru_attach = raw_uattach,
 376         .pru_bind = raw_ubind,
 377         .pru_connect = raw_uconnect,
 378         .pru_connect2 = pr_generic_notsupp,
 379         .pru_control = pr_generic_notsupp,
 380         .pru_detach = raw_udetach,
 381         .pru_disconnect = raw_udisconnect,
 382         .pru_listen = pr_generic_notsupp,
 383         .pru_peeraddr = raw_upeeraddr,
 384         .pru_rcvd = pr_generic_notsupp,
 385         .pru_rcvoob = pr_generic_notsupp,
 386         .pru_send = raw_usend,
 387         .pru_sense = pru_sense_null,
 388         .pru_shutdown = raw_ushutdown,
 389         .pru_sockaddr = raw_usockaddr,
 390         .pru_sosend = sosend,
 391         .pru_soreceive = soreceive
 392 };