Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/net/raw_usrreq.c
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1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1980, 1986, 1993 5 * The Regents of the University of California. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * @(#)raw_usrreq.c 8.1 (Berkeley) 6/10/93 33 * $FreeBSD: releng/12.0/sys/net/raw_usrreq.c 326023 2017-11-20 19:43:44Z pfg $ 34 */ 35 36 #include <sys/param.h> 37 #include <sys/kernel.h> 38 #include <sys/lock.h> 39 #include <sys/malloc.h> 40 #include <sys/mbuf.h> 41 #include <sys/mutex.h> 42 #include <sys/priv.h> 43 #include <sys/protosw.h> 44 #include <sys/signalvar.h> 45 #include <sys/socket.h> 46 #include <sys/socketvar.h> 47 #include <sys/sx.h> 48 #include <sys/systm.h> 49 50 #include <net/if.h> 51 #include <net/vnet.h> 52 #include <net/raw_cb.h> 53 54 MTX_SYSINIT(rawcb_mtx, &rawcb_mtx, "rawcb", MTX_DEF); 55 56 /* 57 * Initialize raw connection block q. 58 */ 59 void 60 raw_init(void) 61 { 62 63 LIST_INIT(&V_rawcb_list); 64 } 65 66 /* 67 * Raw protocol input routine. Find the socket associated with the packet(s) 68 * and move them over. If nothing exists for this packet, drop it. 69 */ 70 /* 71 * Raw protocol interface. 72 */ 73 void 74 raw_input(struct mbuf *m0, struct sockproto *proto, struct sockaddr *src) 75 { 76 77 return (raw_input_ext(m0, proto, src, NULL)); 78 } 79 80 void 81 raw_input_ext(struct mbuf *m0, struct sockproto *proto, struct sockaddr *src, 82 raw_input_cb_fn cb) 83 { 84 struct rawcb *rp; 85 struct mbuf *m = m0; 86 struct socket *last; 87 88 last = NULL; 89 mtx_lock(&rawcb_mtx); 90 LIST_FOREACH(rp, &V_rawcb_list, list) { 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 if (cb != NULL && (*cb)(m, proto, src, rp) != 0) 97 continue; 98 if (last) { 99 struct mbuf *n; 100 n = m_copym(m, 0, M_COPYALL, M_NOWAIT); 101 if (n) { 102 if (sbappendaddr(&last->so_rcv, src, 103 n, (struct mbuf *)0) == 0) 104 /* should notify about lost packet */ 105 m_freem(n); 106 else 107 sorwakeup(last); 108 } 109 } 110 last = rp->rcb_socket; 111 } 112 if (last) { 113 if (sbappendaddr(&last->so_rcv, src, 114 m, (struct mbuf *)0) == 0) 115 m_freem(m); 116 else 117 sorwakeup(last); 118 } else 119 m_freem(m); 120 mtx_unlock(&rawcb_mtx); 121 } 122 123 /*ARGSUSED*/ 124 void 125 raw_ctlinput(int cmd, struct sockaddr *arg, void *dummy) 126 { 127 128 if (cmd < 0 || cmd >= PRC_NCMDS) 129 return; 130 /* INCOMPLETE */ 131 } 132 133 static void 134 raw_uabort(struct socket *so) 135 { 136 137 KASSERT(sotorawcb(so) != NULL, ("raw_uabort: rp == NULL")); 138 139 soisdisconnected(so); 140 } 141 142 static void 143 raw_uclose(struct socket *so) 144 { 145 146 KASSERT(sotorawcb(so) != NULL, ("raw_uabort: rp == NULL")); 147 148 soisdisconnected(so); 149 } 150 151 /* pru_accept is EOPNOTSUPP */ 152 153 static int 154 raw_uattach(struct socket *so, int proto, struct thread *td) 155 { 156 int error; 157 158 /* 159 * Implementors of raw sockets will already have allocated the PCB, 160 * so it must be non-NULL here. 161 */ 162 KASSERT(sotorawcb(so) != NULL, ("raw_uattach: so_pcb == NULL")); 163 164 if (td != NULL) { 165 error = priv_check(td, PRIV_NET_RAW); 166 if (error) 167 return (error); 168 } 169 return (raw_attach(so, proto)); 170 } 171 172 static int 173 raw_ubind(struct socket *so, struct sockaddr *nam, struct thread *td) 174 { 175 176 return (EINVAL); 177 } 178 179 static int 180 raw_uconnect(struct socket *so, struct sockaddr *nam, struct thread *td) 181 { 182 183 return (EINVAL); 184 } 185 186 /* pru_connect2 is EOPNOTSUPP */ 187 /* pru_control is EOPNOTSUPP */ 188 189 static void 190 raw_udetach(struct socket *so) 191 { 192 struct rawcb *rp = sotorawcb(so); 193 194 KASSERT(rp != NULL, ("raw_udetach: rp == NULL")); 195 196 raw_detach(rp); 197 } 198 199 static int 200 raw_udisconnect(struct socket *so) 201 { 202 203 KASSERT(sotorawcb(so) != NULL, ("raw_udisconnect: rp == NULL")); 204 205 return (ENOTCONN); 206 } 207 208 /* pru_listen is EOPNOTSUPP */ 209 210 static int 211 raw_upeeraddr(struct socket *so, struct sockaddr **nam) 212 { 213 214 KASSERT(sotorawcb(so) != NULL, ("raw_upeeraddr: rp == NULL")); 215 216 return (ENOTCONN); 217 } 218 219 /* pru_rcvd is EOPNOTSUPP */ 220 /* pru_rcvoob is EOPNOTSUPP */ 221 222 static int 223 raw_usend(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam, 224 struct mbuf *control, struct thread *td) 225 { 226 227 KASSERT(sotorawcb(so) != NULL, ("raw_usend: rp == NULL")); 228 229 if ((flags & PRUS_OOB) || (control && control->m_len)) { 230 if (m != NULL) 231 m_freem(m); 232 if (control != NULL) 233 m_freem(control); 234 return (EOPNOTSUPP); 235 } 236 237 /* 238 * For historical (bad?) reasons, we effectively ignore the address 239 * argument to sendto(2). Perhaps we should return an error instead? 240 */ 241 return ((*so->so_proto->pr_output)(m, so)); 242 } 243 244 /* pru_sense is null */ 245 246 static int 247 raw_ushutdown(struct socket *so) 248 { 249 250 KASSERT(sotorawcb(so) != NULL, ("raw_ushutdown: rp == NULL")); 251 252 socantsendmore(so); 253 return (0); 254 } 255 256 static int 257 raw_usockaddr(struct socket *so, struct sockaddr **nam) 258 { 259 260 KASSERT(sotorawcb(so) != NULL, ("raw_usockaddr: rp == NULL")); 261 262 return (EINVAL); 263 } 264 265 struct pr_usrreqs raw_usrreqs = { 266 .pru_abort = raw_uabort, 267 .pru_attach = raw_uattach, 268 .pru_bind = raw_ubind, 269 .pru_connect = raw_uconnect, 270 .pru_detach = raw_udetach, 271 .pru_disconnect = raw_udisconnect, 272 .pru_peeraddr = raw_upeeraddr, 273 .pru_send = raw_usend, 274 .pru_shutdown = raw_ushutdown, 275 .pru_sockaddr = raw_usockaddr, 276 .pru_close = raw_uclose, 277 };
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