1 /* $NetBSD: raw_usrreq.c,v 1.40 2014/06/22 08:10:18 rtr Exp $ */ 2 3 /* 4 * Copyright (c) 1980, 1986, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * @(#)raw_usrreq.c 8.1 (Berkeley) 6/10/93 32 */ 33 34 /* 35 * Raw protocol interface. 36 */ 37 38 #include <sys/cdefs.h> 39 __KERNEL_RCSID(0, "$NetBSD: raw_usrreq.c,v 1.40 2014/06/22 08:10:18 rtr Exp $"); 40 41 #include <sys/param.h> 42 #include <sys/mbuf.h> 43 #include <sys/domain.h> 44 #include <sys/protosw.h> 45 #include <sys/socket.h> 46 #include <sys/socketvar.h> 47 #include <sys/errno.h> 48 #include <sys/systm.h> 49 #include <sys/proc.h> 50 #include <sys/kauth.h> 51 52 #include <net/if.h> 53 #include <net/route.h> 54 #include <net/netisr.h> 55 #include <net/raw_cb.h> 56 57 void 58 raw_init(void) 59 { 60 LIST_INIT(&rawcb); 61 } 62 63 static inline int 64 equal(const struct sockaddr *a1, const struct sockaddr *a2) 65 { 66 return memcmp(a1, a2, a1->sa_len) == 0; 67 } 68 69 /* 70 * raw_input: find the socket associated with the packet and move it over. 71 * If nothing exists for this packet, drop it. 72 */ 73 void 74 raw_input(struct mbuf *m0, ...) 75 { 76 struct rawcb *rp; 77 struct mbuf *m = m0; 78 struct socket *last; 79 va_list ap; 80 struct sockproto *proto; 81 struct sockaddr *src, *dst; 82 83 KASSERT(mutex_owned(softnet_lock)); 84 85 va_start(ap, m0); 86 proto = va_arg(ap, struct sockproto *); 87 src = va_arg(ap, struct sockaddr *); 88 dst = va_arg(ap, struct sockaddr *); 89 va_end(ap); 90 91 last = NULL; 92 LIST_FOREACH(rp, &rawcb, rcb_list) { 93 if (rp->rcb_proto.sp_family != proto->sp_family) 94 continue; 95 if (rp->rcb_proto.sp_protocol && 96 rp->rcb_proto.sp_protocol != proto->sp_protocol) 97 continue; 98 /* 99 * We assume the lower level routines have 100 * placed the address in a canonical format 101 * suitable for a structure comparison. 102 * 103 * Note that if the lengths are not the same 104 * the comparison will fail at the first byte. 105 */ 106 if (rp->rcb_laddr && !equal(rp->rcb_laddr, dst)) 107 continue; 108 if (rp->rcb_faddr && !equal(rp->rcb_faddr, src)) 109 continue; 110 if (last != NULL) { 111 struct mbuf *n; 112 if ((n = m_copy(m, 0, M_COPYALL)) == NULL) 113 ; 114 else if (sbappendaddr(&last->so_rcv, src, n, NULL) == 0) 115 /* should notify about lost packet */ 116 m_freem(n); 117 else { 118 sorwakeup(last); 119 } 120 } 121 last = rp->rcb_socket; 122 } 123 if (last == NULL || sbappendaddr(&last->so_rcv, src, m, NULL) == 0) 124 m_freem(m); 125 else { 126 sorwakeup(last); 127 } 128 } 129 130 void * 131 raw_ctlinput(int cmd, const struct sockaddr *arg, void *d) 132 { 133 134 if ((unsigned)cmd >= PRC_NCMDS) 135 return NULL; 136 return NULL; 137 /* INCOMPLETE */ 138 } 139 140 void 141 raw_setsockaddr(struct rawcb *rp, struct mbuf *nam) 142 { 143 144 nam->m_len = rp->rcb_laddr->sa_len; 145 memcpy(mtod(nam, void *), rp->rcb_laddr, (size_t)nam->m_len); 146 } 147 148 void 149 raw_setpeeraddr(struct rawcb *rp, struct mbuf *nam) 150 { 151 152 nam->m_len = rp->rcb_faddr->sa_len; 153 memcpy(mtod(nam, void *), rp->rcb_faddr, (size_t)nam->m_len); 154 } 155 156 int 157 raw_usrreq(struct socket *so, int req, struct mbuf *m, struct mbuf *nam, 158 struct mbuf *control, struct lwp *l) 159 { 160 struct rawcb *rp = sotorawcb(so); 161 int s, error = 0; 162 163 KASSERT(req != PRU_ATTACH); 164 KASSERT(req != PRU_DETACH); 165 KASSERT(req != PRU_CONTROL); 166 167 s = splsoftnet(); 168 KERNEL_LOCK(1, NULL); 169 170 KASSERT(!control || (req == PRU_SEND || req == PRU_SENDOOB)); 171 if (rp == NULL) { 172 error = EINVAL; 173 goto release; 174 } 175 176 switch (req) { 177 /* 178 * If a socket isn't bound to a single address, 179 * the raw input routine will hand it anything 180 * within that protocol family (assuming there's 181 * nothing else around it should go to). 182 */ 183 case PRU_BIND: 184 case PRU_LISTEN: 185 case PRU_CONNECT: 186 case PRU_CONNECT2: 187 error = EOPNOTSUPP; 188 break; 189 190 case PRU_DISCONNECT: 191 soisdisconnected(so); 192 raw_disconnect(rp); 193 break; 194 195 /* 196 * Mark the connection as being incapable of further input. 197 */ 198 case PRU_SHUTDOWN: 199 socantsendmore(so); 200 break; 201 202 case PRU_RCVD: 203 error = EOPNOTSUPP; 204 break; 205 206 /* 207 * Ship a packet out. The appropriate raw output 208 * routine handles any massaging necessary. 209 */ 210 case PRU_SEND: 211 if (control && control->m_len) { 212 m_freem(control); 213 m_freem(m); 214 error = EINVAL; 215 break; 216 } 217 if (nam) { 218 if ((so->so_state & SS_ISCONNECTED) != 0) { 219 error = EISCONN; 220 goto die; 221 } 222 error = (*so->so_proto->pr_usrreqs->pr_generic)(so, 223 PRU_CONNECT, NULL, nam, NULL, l); 224 if (error) { 225 die: 226 m_freem(m); 227 break; 228 } 229 } else { 230 if ((so->so_state & SS_ISCONNECTED) == 0) { 231 error = ENOTCONN; 232 goto die; 233 } 234 } 235 error = (*so->so_proto->pr_output)(m, so); 236 if (nam) 237 raw_disconnect(rp); 238 break; 239 240 case PRU_SENSE: 241 /* 242 * stat: don't bother with a blocksize. 243 */ 244 error = 0; 245 break; 246 247 /* 248 * Not supported. 249 */ 250 case PRU_RCVOOB: 251 error = EOPNOTSUPP; 252 break; 253 254 case PRU_SENDOOB: 255 m_freem(control); 256 m_freem(m); 257 error = EOPNOTSUPP; 258 break; 259 260 case PRU_SOCKADDR: 261 if (rp->rcb_laddr == NULL) { 262 error = EINVAL; 263 break; 264 } 265 raw_setsockaddr(rp, nam); 266 break; 267 268 case PRU_PEERADDR: 269 if (rp->rcb_faddr == NULL) { 270 error = ENOTCONN; 271 break; 272 } 273 raw_setpeeraddr(rp, nam); 274 break; 275 276 default: 277 panic("raw_usrreq"); 278 } 279 280 release: 281 KERNEL_UNLOCK_ONE(NULL); 282 splx(s); 283 return (error); 284 } 285