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. 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  *      @(#)raw_usrreq.c        8.1 (Berkeley) 6/10/93
  34  * $FreeBSD: src/sys/net/raw_usrreq.c,v 1.18 1999/08/28 00:48:28 peter Exp $
  35  * $DragonFly: src/sys/net/raw_usrreq.c,v 1.14 2007/06/24 20:00:00 dillon Exp $
  36  */
  37
  38 #include <sys/param.h>
  39 #include <sys/systm.h>
  40 #include <sys/mbuf.h>
  41 #include <sys/proc.h>
  42 #include <sys/protosw.h>
  43 #include <sys/socket.h>
  44 #include <sys/socketvar.h>
  45
  46 #include <net/raw_cb.h>
  47
  48 /*
  49  * Initialize raw connection block q.
  50  */
  51 void
  52 raw_init(void)
  53 {
  54         LIST_INIT(&rawcb_list);
  55 }
  56
  57 /************************************************************************
  58  *                       RAW PROTOCOL INTERFACE                         *
  59  ************************************************************************/
  60
  61 /*
  62  * Raw protocol input routine.  Find the socket associated with the packet(s)
  63  * and move them over.  If nothing exists for this packet, drop it.  This
  64  * routine is indirect called via rts_input() and will be serialized on
  65  * cpu 0.
  66  *
  67  * Most other raw protocol interface functions are also serialized XXX.
  68  */
  69 void
  70 raw_input(struct mbuf *m0, struct sockproto *proto, const struct sockaddr *src,
  71           const struct sockaddr *dst)
  72 {
  73         struct rawcb *rp;
  74         struct mbuf *m = m0;
  75         struct socket *last;
  76
  77         last = NULL;
  78         LIST_FOREACH(rp, &rawcb_list, list) {
  79                 if (rp->rcb_proto.sp_family != proto->sp_family)
  80                         continue;
  81                 if (rp->rcb_proto.sp_protocol  &&
  82                     rp->rcb_proto.sp_protocol != proto->sp_protocol)
  83                         continue;
  84                 /*
  85                  * We assume the lower level routines have
  86                  * placed the address in a canonical format
  87                  * suitable for a structure comparison.
  88                  *
  89                  * Note that if the lengths are not the same
  90                  * the comparison will fail at the first byte.
  91                  */
  92                 if (rp->rcb_laddr && !sa_equal(rp->rcb_laddr, dst))
  93                         continue;
  94                 if (rp->rcb_faddr && !sa_equal(rp->rcb_faddr, src))
  95                         continue;
  96                 if (last) {
  97                         struct mbuf *n;
  98
  99                         n = m_copypacket(m, MB_DONTWAIT);
 100                         if (n != NULL) {
 101                                 if (ssb_appendaddr(&last->so_rcv, src, n,
 102                                                  (struct mbuf *)0) == 0) {
 103                                         /* should notify about lost packet */
 104                                         m_freem(n);
 105                                 } else {
 106                                         sorwakeup(last);
 107                                 }
 108                         }
 109                 }
 110                 last = rp->rcb_socket;
 111         }
 112         if (last) {
 113                 if (ssb_appendaddr(&last->so_rcv, src, m, (struct mbuf *)0) == 0)
 114                         m_freem(m);
 115                 else
 116                         sorwakeup(last);
 117         } else {
 118                 m_freem(m);
 119         }
 120 }
 121
 122 /*ARGSUSED*/
 123 void
 124 raw_ctlinput(int cmd, struct sockaddr *arg, void *dummy)
 125 {
 126
 127         if (cmd < 0 || cmd > PRC_NCMDS)
 128                 return;
 129         /* INCOMPLETE */
 130 }
 131
 132 static int
 133 raw_uabort(struct socket *so)
 134 {
 135         struct rawcb *rp = sotorawcb(so);
 136
 137         if (rp == NULL)
 138                 return EINVAL;
 139         raw_disconnect(rp);
 140         sofree(so);
 141         soisdisconnected(so);
 142         return 0;
 143 }
 144
 145 /* pru_accept is EOPNOTSUPP */
 146
 147 static int
 148 raw_uattach(struct socket *so, int proto, struct pru_attach_info *ai)
 149 {
 150         struct rawcb *rp = sotorawcb(so);
 151         int error;
 152
 153         if (rp == NULL)
 154                 return EINVAL;
 155         if ((error = suser_cred(ai->p_ucred, NULL_CRED_OKAY)) != 0)
 156                 return error;
 157         return raw_attach(so, proto, ai->sb_rlimit);
 158 }
 159
 160 static int
 161 raw_ubind(struct socket *so, struct sockaddr *nam, struct thread *td)
 162 {
 163         return EINVAL;
 164 }
 165
 166 static int
 167 raw_uconnect(struct socket *so, struct sockaddr *nam, struct thread *td)
 168 {
 169         return EINVAL;
 170 }
 171
 172 /* pru_connect2 is EOPNOTSUPP */
 173 /* pru_control is EOPNOTSUPP */
 174
 175 static int
 176 raw_udetach(struct socket *so)
 177 {
 178         struct rawcb *rp = sotorawcb(so);
 179
 180         if (rp == NULL)
 181                 return EINVAL;
 182
 183         raw_detach(rp);
 184         return 0;
 185 }
 186
 187 static int
 188 raw_udisconnect(struct socket *so)
 189 {
 190         struct rawcb *rp = sotorawcb(so);
 191
 192         if (rp == NULL)
 193                 return EINVAL;
 194         if (rp->rcb_faddr == NULL) {
 195                 return ENOTCONN;
 196         }
 197         raw_disconnect(rp);
 198         soisdisconnected(so);
 199         return 0;
 200 }
 201
 202 /* pru_listen is EOPNOTSUPP */
 203
 204 static int
 205 raw_upeeraddr(struct socket *so, struct sockaddr **nam)
 206 {
 207         struct rawcb *rp = sotorawcb(so);
 208
 209         if (rp == NULL)
 210                 return EINVAL;
 211         if (rp->rcb_faddr == NULL) {
 212                 return ENOTCONN;
 213         }
 214         *nam = dup_sockaddr(rp->rcb_faddr);
 215         return 0;
 216 }
 217
 218 /* pru_rcvd is EOPNOTSUPP */
 219 /* pru_rcvoob is EOPNOTSUPP */
 220
 221 static int
 222 raw_usend(struct socket *so, int flags, struct mbuf *m,
 223           struct sockaddr *nam, struct mbuf *control, struct thread *td)
 224 {
 225         int error;
 226         struct rawcb *rp = sotorawcb(so);
 227         struct pr_output_info oi;
 228
 229         if (rp == NULL) {
 230                 error = EINVAL;
 231                 goto release;
 232         }
 233
 234         if (flags & PRUS_OOB) {
 235                 error = EOPNOTSUPP;
 236                 goto release;
 237         }
 238
 239         if (control && control->m_len) {
 240                 error = EOPNOTSUPP;
 241                 goto release;
 242         }
 243         if (nam) {
 244                 if (rp->rcb_faddr) {
 245                         error = EISCONN;
 246                         goto release;
 247                 }
 248                 rp->rcb_faddr = nam;
 249         } else if (rp->rcb_faddr == NULL) {
 250                 error = ENOTCONN;
 251                 goto release;
 252         }
 253         oi.p_pid = td->td_proc->p_pid;
 254         error = (*so->so_proto->pr_output)(m, so, &oi);
 255         m = NULL;
 256         if (nam)
 257                 rp->rcb_faddr = NULL;
 258 release:
 259         if (m != NULL)
 260                 m_freem(m);
 261         return (error);
 262 }
 263
 264 /* pru_sense is null */
 265
 266 static int
 267 raw_ushutdown(struct socket *so)
 268 {
 269         struct rawcb *rp = sotorawcb(so);
 270
 271         if (rp == NULL)
 272                 return EINVAL;
 273         socantsendmore(so);
 274         return 0;
 275 }
 276
 277 static int
 278 raw_usockaddr(struct socket *so, struct sockaddr **nam)
 279 {
 280         struct rawcb *rp = sotorawcb(so);
 281
 282         if (rp == NULL)
 283                 return EINVAL;
 284         if (rp->rcb_laddr == NULL)
 285                 return EINVAL;
 286         *nam = dup_sockaddr(rp->rcb_laddr);
 287         return 0;
 288 }
 289
 290 struct pr_usrreqs raw_usrreqs = {
 291         .pru_abort = raw_uabort,
 292         .pru_accept = pru_accept_notsupp,
 293         .pru_attach = raw_uattach,
 294         .pru_bind = raw_ubind,
 295         .pru_connect = raw_uconnect,
 296         .pru_connect2 = pru_connect2_notsupp,
 297         .pru_control = pru_control_notsupp,
 298         .pru_detach = raw_udetach,
 299         .pru_disconnect = raw_udisconnect,
 300         .pru_listen = pru_listen_notsupp,
 301         .pru_peeraddr = raw_upeeraddr,
 302         .pru_rcvd = pru_rcvd_notsupp,
 303         .pru_rcvoob = pru_rcvoob_notsupp,
 304         .pru_send = raw_usend,
 305         .pru_sense = pru_sense_null,
 306         .pru_shutdown = raw_ushutdown,
 307         .pru_sockaddr = raw_usockaddr,
 308         .pru_sosend = sosend,
 309         .pru_soreceive = soreceive,
 310         .pru_sopoll = sopoll
 311 };
 312