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 1.11 2006/01/14 11:05:17 swildner 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 /*
  59  * Raw protocol input routine.  Find the socket
  60  * associated with the packet(s) and move them over.  If
  61  * nothing exists for this packet, drop it.
  62  */
  63 /*
  64  * Raw protocol interface.
  65  */
  66 void
  67 raw_input(struct mbuf *m0, struct sockproto *proto, const struct sockaddr *src,
  68           const struct sockaddr *dst)
  69 {
  70         struct rawcb *rp;
  71         struct mbuf *m = m0;
  72         struct socket *last;
  73
  74         last = NULL;
  75         LIST_FOREACH(rp, &rawcb_list, list) {
  76                 if (rp->rcb_proto.sp_family != proto->sp_family)
  77                         continue;
  78                 if (rp->rcb_proto.sp_protocol  &&
  79                     rp->rcb_proto.sp_protocol != proto->sp_protocol)
  80                         continue;
  81                 /*
  82                  * We assume the lower level routines have
  83                  * placed the address in a canonical format
  84                  * suitable for a structure comparison.
  85                  *
  86                  * Note that if the lengths are not the same
  87                  * the comparison will fail at the first byte.
  88                  */
  89                 if (rp->rcb_laddr && !sa_equal(rp->rcb_laddr, dst))
  90                         continue;
  91                 if (rp->rcb_faddr && !sa_equal(rp->rcb_faddr, src))
  92                         continue;
  93                 if (last) {
  94                         struct mbuf *n;
  95
  96                         n = m_copypacket(m, MB_DONTWAIT);
  97                         if (n != NULL) {
  98                                 if (sbappendaddr(&last->so_rcv, src, n,
  99                                                  (struct mbuf *)0) == 0) {
 100                                         /* should notify about lost packet */
 101                                         m_freem(n);
 102                                 } else {
 103                                         sorwakeup(last);
 104                                 }
 105                         }
 106                 }
 107                 last = rp->rcb_socket;
 108         }
 109         if (last) {
 110                 if (sbappendaddr(&last->so_rcv, src, m, (struct mbuf *)0) == 0)
 111                         m_freem(m);
 112                 else
 113                         sorwakeup(last);
 114         } else {
 115                 m_freem(m);
 116         }
 117 }
 118
 119 /*ARGSUSED*/
 120 void
 121 raw_ctlinput(int cmd, struct sockaddr *arg, void *dummy)
 122 {
 123
 124         if (cmd < 0 || cmd > PRC_NCMDS)
 125                 return;
 126         /* INCOMPLETE */
 127 }
 128
 129 static int
 130 raw_uabort(struct socket *so)
 131 {
 132         struct rawcb *rp = sotorawcb(so);
 133
 134         if (rp == NULL)
 135                 return EINVAL;
 136         raw_disconnect(rp);
 137         sofree(so);
 138         soisdisconnected(so);
 139         return 0;
 140 }
 141
 142 /* pru_accept is EOPNOTSUPP */
 143
 144 static int
 145 raw_uattach(struct socket *so, int proto, struct pru_attach_info *ai)
 146 {
 147         struct rawcb *rp = sotorawcb(so);
 148         int error;
 149
 150         if (rp == NULL)
 151                 return EINVAL;
 152         if ((error = suser_cred(ai->p_ucred, NULL_CRED_OKAY)) != 0)
 153                 return error;
 154         return raw_attach(so, proto, ai->sb_rlimit);
 155 }
 156
 157 static int
 158 raw_ubind(struct socket *so, struct sockaddr *nam, struct thread *td)
 159 {
 160         return EINVAL;
 161 }
 162
 163 static int
 164 raw_uconnect(struct socket *so, struct sockaddr *nam, struct thread *td)
 165 {
 166         return EINVAL;
 167 }
 168
 169 /* pru_connect2 is EOPNOTSUPP */
 170 /* pru_control is EOPNOTSUPP */
 171
 172 static int
 173 raw_udetach(struct socket *so)
 174 {
 175         struct rawcb *rp = sotorawcb(so);
 176
 177         if (rp == NULL)
 178                 return EINVAL;
 179
 180         raw_detach(rp);
 181         return 0;
 182 }
 183
 184 static int
 185 raw_udisconnect(struct socket *so)
 186 {
 187         struct rawcb *rp = sotorawcb(so);
 188
 189         if (rp == NULL)
 190                 return EINVAL;
 191         if (rp->rcb_faddr == NULL) {
 192                 return ENOTCONN;
 193         }
 194         raw_disconnect(rp);
 195         soisdisconnected(so);
 196         return 0;
 197 }
 198
 199 /* pru_listen is EOPNOTSUPP */
 200
 201 static int
 202 raw_upeeraddr(struct socket *so, struct sockaddr **nam)
 203 {
 204         struct rawcb *rp = sotorawcb(so);
 205
 206         if (rp == NULL)
 207                 return EINVAL;
 208         if (rp->rcb_faddr == NULL) {
 209                 return ENOTCONN;
 210         }
 211         *nam = dup_sockaddr(rp->rcb_faddr);
 212         return 0;
 213 }
 214
 215 /* pru_rcvd is EOPNOTSUPP */
 216 /* pru_rcvoob is EOPNOTSUPP */
 217
 218 static int
 219 raw_usend(struct socket *so, int flags, struct mbuf *m,
 220           struct sockaddr *nam, struct mbuf *control, struct thread *td)
 221 {
 222         int error;
 223         struct rawcb *rp = sotorawcb(so);
 224         struct pr_output_info oi;
 225
 226         if (rp == NULL) {
 227                 error = EINVAL;
 228                 goto release;
 229         }
 230
 231         if (flags & PRUS_OOB) {
 232                 error = EOPNOTSUPP;
 233                 goto release;
 234         }
 235
 236         if (control && control->m_len) {
 237                 error = EOPNOTSUPP;
 238                 goto release;
 239         }
 240         if (nam) {
 241                 if (rp->rcb_faddr) {
 242                         error = EISCONN;
 243                         goto release;
 244                 }
 245                 rp->rcb_faddr = nam;
 246         } else if (rp->rcb_faddr == NULL) {
 247                 error = ENOTCONN;
 248                 goto release;
 249         }
 250         oi.p_pid = td->td_proc->p_pid;
 251         error = (*so->so_proto->pr_output)(m, so, &oi);
 252         m = NULL;
 253         if (nam)
 254                 rp->rcb_faddr = NULL;
 255 release:
 256         if (m != NULL)
 257                 m_freem(m);
 258         return (error);
 259 }
 260
 261 /* pru_sense is null */
 262
 263 static int
 264 raw_ushutdown(struct socket *so)
 265 {
 266         struct rawcb *rp = sotorawcb(so);
 267
 268         if (rp == NULL)
 269                 return EINVAL;
 270         socantsendmore(so);
 271         return 0;
 272 }
 273
 274 static int
 275 raw_usockaddr(struct socket *so, struct sockaddr **nam)
 276 {
 277         struct rawcb *rp = sotorawcb(so);
 278
 279         if (rp == NULL)
 280                 return EINVAL;
 281         if (rp->rcb_laddr == NULL)
 282                 return EINVAL;
 283         *nam = dup_sockaddr(rp->rcb_laddr);
 284         return 0;
 285 }
 286
 287 struct pr_usrreqs raw_usrreqs = {
 288         raw_uabort, pru_accept_notsupp, raw_uattach, raw_ubind, raw_uconnect,
 289         pru_connect2_notsupp, pru_control_notsupp, raw_udetach,
 290         raw_udisconnect, pru_listen_notsupp, raw_upeeraddr, pru_rcvd_notsupp,
 291         pru_rcvoob_notsupp, raw_usend, pru_sense_null, raw_ushutdown,
 292         raw_usockaddr, sosend, soreceive, sopoll
 293 };