| 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/caps.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 = caps_priv_check(ai->p_ucred, SYSCAP_RESTRICTEDROOT | |
| 196 | __SYSCAP_NULLCRED); |
| 197 | if (error == 0) |
| 198 | error = raw_attach(so, proto, ai->sb_rlimit); |
| 199 | } else { |
| 200 | error = EINVAL; |
| 201 | } |
| 202 | lwkt_replymsg(&msg->lmsg, error); |
| 203 | } |
| 204 | |
| 205 | static void |
| 206 | raw_ubind(netmsg_t msg) |
| 207 | { |
| 208 | ASSERT_NETISR0; |
| 209 | lwkt_replymsg(&msg->lmsg, EINVAL); |
| 210 | } |
| 211 | |
| 212 | static void |
| 213 | raw_uconnect(netmsg_t msg) |
| 214 | { |
| 215 | ASSERT_NETISR0; |
| 216 | lwkt_replymsg(&msg->lmsg, EINVAL); |
| 217 | } |
| 218 | |
| 219 | /* pru_connect2 is EOPNOTSUPP */ |
| 220 | /* pru_control is EOPNOTSUPP */ |
| 221 | |
| 222 | static void |
| 223 | raw_udetach(netmsg_t msg) |
| 224 | { |
| 225 | struct rawcb *rp = sotorawcb(msg->base.nm_so); |
| 226 | int error; |
| 227 | |
| 228 | ASSERT_NETISR0; |
| 229 | |
| 230 | if (rp) { |
| 231 | raw_detach(rp); |
| 232 | error = 0; |
| 233 | } else { |
| 234 | error = EINVAL; |
| 235 | } |
| 236 | lwkt_replymsg(&msg->lmsg, error); |
| 237 | } |
| 238 | |
| 239 | static void |
| 240 | raw_udisconnect(netmsg_t msg) |
| 241 | { |
| 242 | struct socket *so = msg->base.nm_so; |
| 243 | struct rawcb *rp; |
| 244 | int error; |
| 245 | |
| 246 | ASSERT_NETISR0; |
| 247 | |
| 248 | rp = sotorawcb(so); |
| 249 | if (rp == NULL) { |
| 250 | error = EINVAL; |
| 251 | } else if (rp->rcb_faddr == NULL) { |
| 252 | error = ENOTCONN; |
| 253 | } else { |
| 254 | soreference(so); |
| 255 | raw_disconnect(rp); |
| 256 | soisdisconnected(so); |
| 257 | sofree(so); |
| 258 | error = 0; |
| 259 | } |
| 260 | lwkt_replymsg(&msg->lmsg, error); |
| 261 | } |
| 262 | |
| 263 | /* pru_listen is EOPNOTSUPP */ |
| 264 | |
| 265 | static void |
| 266 | raw_upeeraddr(netmsg_t msg) |
| 267 | { |
| 268 | struct rawcb *rp = sotorawcb(msg->base.nm_so); |
| 269 | int error; |
| 270 | |
| 271 | ASSERT_NETISR0; |
| 272 | |
| 273 | if (rp == NULL) { |
| 274 | error = EINVAL; |
| 275 | } else if (rp->rcb_faddr == NULL) { |
| 276 | error = ENOTCONN; |
| 277 | } else { |
| 278 | *msg->peeraddr.nm_nam = dup_sockaddr(rp->rcb_faddr); |
| 279 | error = 0; |
| 280 | } |
| 281 | lwkt_replymsg(&msg->lmsg, error); |
| 282 | } |
| 283 | |
| 284 | /* pru_rcvd is EOPNOTSUPP */ |
| 285 | /* pru_rcvoob is EOPNOTSUPP */ |
| 286 | |
| 287 | static void |
| 288 | raw_usend(netmsg_t msg) |
| 289 | { |
| 290 | struct socket *so = msg->base.nm_so; |
| 291 | struct mbuf *m = msg->send.nm_m; |
| 292 | struct mbuf *control = msg->send.nm_control; |
| 293 | struct rawcb *rp = sotorawcb(so); |
| 294 | struct pr_output_info oi; |
| 295 | int flags = msg->send.nm_flags; |
| 296 | int error; |
| 297 | |
| 298 | ASSERT_NETISR0; |
| 299 | |
| 300 | if (rp == NULL) { |
| 301 | error = EINVAL; |
| 302 | goto release; |
| 303 | } |
| 304 | |
| 305 | if (flags & PRUS_OOB) { |
| 306 | error = EOPNOTSUPP; |
| 307 | goto release; |
| 308 | } |
| 309 | |
| 310 | if (control && control->m_len) { |
| 311 | error = EOPNOTSUPP; |
| 312 | goto release; |
| 313 | } |
| 314 | if (msg->send.nm_addr) { |
| 315 | if (rp->rcb_faddr) { |
| 316 | error = EISCONN; |
| 317 | goto release; |
| 318 | } |
| 319 | rp->rcb_faddr = msg->send.nm_addr; |
| 320 | } else if (rp->rcb_faddr == NULL) { |
| 321 | error = ENOTCONN; |
| 322 | goto release; |
| 323 | } |
| 324 | oi.p_pid = msg->send.nm_td->td_proc->p_pid; |
| 325 | error = (*so->so_proto->pr_output)(m, so, &oi); |
| 326 | m = NULL; |
| 327 | if (msg->send.nm_addr) |
| 328 | rp->rcb_faddr = NULL; |
| 329 | release: |
| 330 | if (m != NULL) |
| 331 | m_freem(m); |
| 332 | lwkt_replymsg(&msg->lmsg, error); |
| 333 | } |
| 334 | |
| 335 | /* pru_sense is null */ |
| 336 | |
| 337 | static void |
| 338 | raw_ushutdown(netmsg_t msg) |
| 339 | { |
| 340 | struct rawcb *rp = sotorawcb(msg->base.nm_so); |
| 341 | int error; |
| 342 | |
| 343 | ASSERT_NETISR0; |
| 344 | |
| 345 | if (rp) { |
| 346 | socantsendmore(msg->base.nm_so); |
| 347 | error = 0; |
| 348 | } else { |
| 349 | error = EINVAL; |
| 350 | } |
| 351 | lwkt_replymsg(&msg->lmsg, error); |
| 352 | } |
| 353 | |
| 354 | static void |
| 355 | raw_usockaddr(netmsg_t msg) |
| 356 | { |
| 357 | struct rawcb *rp = sotorawcb(msg->base.nm_so); |
| 358 | int error; |
| 359 | |
| 360 | ASSERT_NETISR0; |
| 361 | |
| 362 | if (rp == NULL) { |
| 363 | error = EINVAL; |
| 364 | } else if (rp->rcb_laddr == NULL) { |
| 365 | error = EINVAL; |
| 366 | } else { |
| 367 | *msg->sockaddr.nm_nam = dup_sockaddr(rp->rcb_laddr); |
| 368 | error = 0; |
| 369 | } |
| 370 | lwkt_replymsg(&msg->lmsg, error); |
| 371 | } |
| 372 | |
| 373 | struct pr_usrreqs raw_usrreqs = { |
| 374 | .pru_abort = raw_uabort, |
| 375 | .pru_accept = pr_generic_notsupp, |
| 376 | .pru_attach = raw_uattach, |
| 377 | .pru_bind = raw_ubind, |
| 378 | .pru_connect = raw_uconnect, |
| 379 | .pru_connect2 = pr_generic_notsupp, |
| 380 | .pru_control = pr_generic_notsupp, |
| 381 | .pru_detach = raw_udetach, |
| 382 | .pru_disconnect = raw_udisconnect, |
| 383 | .pru_listen = pr_generic_notsupp, |
| 384 | .pru_peeraddr = raw_upeeraddr, |
| 385 | .pru_rcvd = pr_generic_notsupp, |
| 386 | .pru_rcvoob = pr_generic_notsupp, |
| 387 | .pru_send = raw_usend, |
| 388 | .pru_sense = pru_sense_null, |
| 389 | .pru_shutdown = raw_ushutdown, |
| 390 | .pru_sockaddr = raw_usockaddr, |
| 391 | .pru_sosend = sosend, |
| 392 | .pru_soreceive = soreceive |
| 393 | }; |