1 /* $NetBSD: protosw.h,v 1.69 2018/09/14 05:09:51 maxv Exp $ */ 2 3 /*- 4 * Copyright (c) 1982, 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 * @(#)protosw.h 8.1 (Berkeley) 6/2/93 32 */ 33 34 #ifndef _SYS_PROTOSW_H_ 35 #define _SYS_PROTOSW_H_ 36 37 /* 38 * Protocol switch table. 39 * 40 * Each protocol has a handle initializing one of these structures, 41 * which is used for protocol-protocol and system-protocol communication. 42 * 43 * A protocol is called through the pr_init entry before any other. 44 * Thereafter it is called every 200ms through the pr_fasttimo entry and 45 * every 500ms through the pr_slowtimo for timer based actions. 46 * The system will call the pr_drain entry if it is low on space and 47 * this should throw away any non-critical data. 48 * 49 * Protocols pass data between themselves as chains of mbufs using 50 * the pr_input and pr_output hooks. Pr_input passes data up (towards 51 * UNIX) and pr_output passes it down (towards the imps); control 52 * information passes up and down on pr_ctlinput and pr_ctloutput. 53 * The protocol is responsible for the space occupied by any the 54 * arguments to these entries and must dispose it. 55 * 56 * The userreq routine interfaces protocols to the system and is 57 * described below. 58 */ 59 60 struct mbuf; 61 struct ifnet; 62 struct sockaddr; 63 struct socket; 64 struct sockopt; 65 struct stat; 66 struct domain; 67 struct proc; 68 struct lwp; 69 struct pr_usrreqs; 70 71 struct protosw { 72 int pr_type; /* socket type used for */ 73 struct domain *pr_domain; /* domain protocol a member of */ 74 short pr_protocol; /* protocol number */ 75 short pr_flags; /* see below */ 76 77 /* protocol-protocol hooks */ 78 void (*pr_input) /* input to protocol (from below) */ 79 (struct mbuf *, int, int); 80 void *(*pr_ctlinput) /* control input (from below) */ 81 (int, const struct sockaddr *, void *); 82 int (*pr_ctloutput) /* control output (from above) */ 83 (int, struct socket *, struct sockopt *); 84 85 /* user-protocol hooks */ 86 const struct pr_usrreqs *pr_usrreqs; 87 88 /* utility hooks */ 89 void (*pr_init) /* initialization hook */ 90 (void); 91 92 void (*pr_fasttimo) /* fast timeout (200ms) */ 93 (void); 94 void (*pr_slowtimo) /* slow timeout (500ms) */ 95 (void); 96 void (*pr_drain) /* flush any excess space possible */ 97 (void); 98 }; 99 100 #define PR_SLOWHZ 2 /* 2 slow timeouts per second */ 101 #define PR_FASTHZ 5 /* 5 fast timeouts per second */ 102 103 /* 104 * Values for pr_flags. 105 * PR_ADDR requires PR_ATOMIC; 106 * PR_ADDR and PR_CONNREQUIRED are mutually exclusive. 107 */ 108 #define PR_ATOMIC 0x01 /* exchange atomic messages only */ 109 #define PR_ADDR 0x02 /* addresses given with messages */ 110 #define PR_CONNREQUIRED 0x04 /* connection required by protocol */ 111 #define PR_WANTRCVD 0x08 /* want pr_rcvd() calls */ 112 #define PR_RIGHTS 0x10 /* passes capabilities */ 113 #define PR_LISTEN 0x20 /* supports listen(2) and accept(2) */ 114 #define PR_LASTHDR 0x40 /* enforce ipsec policy; last header */ 115 #define PR_ABRTACPTDIS 0x80 /* abort on accept(2) to disconnected 116 socket */ 117 #define PR_PURGEIF 0x100 /* might store struct ifnet pointer; 118 pr_purgeif() must be called on ifnet 119 deletion */ 120 #define PR_ADDR_OPT 0x200 /* Allow address during delivery */ 121 122 123 /* 124 * The arguments to usrreq are: 125 * (*protosw[].pr_usrreq)(up, req, m, nam, opt, p); 126 * where up is a (struct socket *), req is one of these requests, 127 * m is a optional mbuf chain containing a message, 128 * nam is an optional mbuf chain containing an address, 129 * opt is an optional mbuf containing socket options, 130 * and p is a pointer to the process requesting the action (if any). 131 * The protocol is responsible for disposal of the mbuf chains m and opt, 132 * the caller is responsible for any space held by nam. 133 * A non-zero return from usrreq gives an 134 * UNIX error number which should be passed to higher level software. 135 */ 136 #define PRU_ATTACH 0 /* attach protocol to up */ 137 #define PRU_DETACH 1 /* detach protocol from up */ 138 #define PRU_BIND 2 /* bind socket to address */ 139 #define PRU_LISTEN 3 /* listen for connection */ 140 #define PRU_CONNECT 4 /* establish connection to peer */ 141 #define PRU_ACCEPT 5 /* accept connection from peer */ 142 #define PRU_DISCONNECT 6 /* disconnect from peer */ 143 #define PRU_SHUTDOWN 7 /* won't send any more data */ 144 #define PRU_RCVD 8 /* have taken data; more room now */ 145 #define PRU_SEND 9 /* send this data */ 146 #define PRU_ABORT 10 /* abort (fast DISCONNECT, DETACH) */ 147 #define PRU_CONTROL 11 /* control operations on protocol */ 148 #define PRU_SENSE 12 /* return status into m */ 149 #define PRU_RCVOOB 13 /* retrieve out of band data */ 150 #define PRU_SENDOOB 14 /* send out of band data */ 151 #define PRU_SOCKADDR 15 /* fetch socket's address */ 152 #define PRU_PEERADDR 16 /* fetch peer's address */ 153 #define PRU_CONNECT2 17 /* connect two sockets */ 154 /* begin for protocols internal use */ 155 #define PRU_FASTTIMO 18 /* 200ms timeout */ 156 #define PRU_SLOWTIMO 19 /* 500ms timeout */ 157 #define PRU_PROTORCV 20 /* receive from below */ 158 #define PRU_PROTOSEND 21 /* send to below */ 159 #define PRU_PURGEIF 22 /* purge specified if */ 160 161 #define PRU_NREQ 23 162 163 #ifdef PRUREQUESTS 164 static const char * const prurequests[] = { 165 "ATTACH", "DETACH", "BIND", "LISTEN", 166 "CONNECT", "ACCEPT", "DISCONNECT", "SHUTDOWN", 167 "RCVD", "SEND", "ABORT", "CONTROL", 168 "SENSE", "RCVOOB", "SENDOOB", "SOCKADDR", 169 "PEERADDR", "CONNECT2", "FASTTIMO", "SLOWTIMO", 170 "PROTORCV", "PROTOSEND", "PURGEIF", 171 }; 172 #endif 173 174 /* 175 * The arguments to the ctlinput routine are 176 * (*protosw[].pr_ctlinput)(cmd, sa, arg); 177 * where cmd is one of the commands below, sa is a pointer to a sockaddr, 178 * and arg is an optional void *argument used within a protocol family. 179 */ 180 #define PRC_IFDOWN 0 /* interface transition */ 181 #define PRC_ROUTEDEAD 1 /* select new route if possible ??? */ 182 #define PRC_QUENCH2 3 /* DEC congestion bit says slow down */ 183 #define PRC_QUENCH 4 /* some one said to slow down */ 184 #define PRC_MSGSIZE 5 /* message size forced drop */ 185 #define PRC_HOSTDEAD 6 /* host appears to be down */ 186 #define PRC_HOSTUNREACH 7 /* deprecated (use PRC_UNREACH_HOST) */ 187 #define PRC_UNREACH_NET 8 /* no route to network */ 188 #define PRC_UNREACH_HOST 9 /* no route to host */ 189 #define PRC_UNREACH_PROTOCOL 10 /* dst says bad protocol */ 190 #define PRC_UNREACH_PORT 11 /* bad port # */ 191 /* was PRC_UNREACH_NEEDFRAG 12 (use PRC_MSGSIZE) */ 192 #define PRC_UNREACH_SRCFAIL 13 /* source route failed */ 193 #define PRC_REDIRECT_NET 14 /* net routing redirect */ 194 #define PRC_REDIRECT_HOST 15 /* host routing redirect */ 195 #define PRC_REDIRECT_TOSNET 16 /* redirect for type of service & net */ 196 #define PRC_REDIRECT_TOSHOST 17 /* redirect for tos & host */ 197 #define PRC_TIMXCEED_INTRANS 18 /* packet lifetime expired in transit */ 198 #define PRC_TIMXCEED_REASS 19 /* lifetime expired on reass q */ 199 #define PRC_PARAMPROB 20 /* header incorrect */ 200 201 #define PRC_NCMDS 21 202 203 #define PRC_IS_REDIRECT(cmd) \ 204 ((cmd) >= PRC_REDIRECT_NET && (cmd) <= PRC_REDIRECT_TOSHOST) 205 206 #ifdef PRCREQUESTS 207 static const char * const prcrequests[] = { 208 "IFDOWN", "ROUTEDEAD", "#2", "DEC-BIT-QUENCH2", 209 "QUENCH", "MSGSIZE", "HOSTDEAD", "#7", 210 "NET-UNREACH", "HOST-UNREACH", "PROTO-UNREACH", "PORT-UNREACH", 211 "#12", "SRCFAIL-UNREACH", "NET-REDIRECT", "HOST-REDIRECT", 212 "TOSNET-REDIRECT", "TOSHOST-REDIRECT", "TX-INTRANS", "TX-REASS", 213 "PARAMPROB" 214 }; 215 #endif 216 217 /* 218 * The arguments to ctloutput are: 219 * (*protosw[].pr_ctloutput)(req, so, sopt); 220 * req is one of the actions listed below, so is a (struct socket *), 221 * sopt is a (struct sockopt *) 222 * A non-zero return from usrreq gives an 223 * UNIX error number which should be passed to higher level software. 224 */ 225 #define PRCO_GETOPT 0 226 #define PRCO_SETOPT 1 227 228 #define PRCO_NCMDS 2 229 230 #ifdef PRCOREQUESTS 231 static const char * const prcorequests[] = { 232 "GETOPT", "SETOPT", 233 }; 234 #endif 235 236 #ifdef _KERNEL 237 238 struct pr_usrreqs { 239 int (*pr_attach)(struct socket *, int); 240 void (*pr_detach)(struct socket *); 241 int (*pr_accept)(struct socket *, struct sockaddr *); 242 int (*pr_connect)(struct socket *, struct sockaddr *, struct lwp *); 243 int (*pr_connect2)(struct socket *, struct socket *); 244 int (*pr_bind)(struct socket *, struct sockaddr *, struct lwp *); 245 int (*pr_listen)(struct socket *, struct lwp *); 246 int (*pr_disconnect)(struct socket *); 247 int (*pr_shutdown)(struct socket *); 248 int (*pr_abort)(struct socket *); 249 int (*pr_ioctl)(struct socket *, u_long, void *, struct ifnet *); 250 int (*pr_stat)(struct socket *, struct stat *); 251 int (*pr_peeraddr)(struct socket *, struct sockaddr *); 252 int (*pr_sockaddr)(struct socket *, struct sockaddr *); 253 int (*pr_rcvd)(struct socket *, int, struct lwp *); 254 int (*pr_recvoob)(struct socket *, struct mbuf *, int); 255 int (*pr_send)(struct socket *, struct mbuf *, struct sockaddr *, 256 struct mbuf *, struct lwp *); 257 int (*pr_sendoob)(struct socket *, struct mbuf *, struct mbuf *); 258 int (*pr_purgeif)(struct socket *, struct ifnet *); 259 }; 260 261 /* 262 * Monotonically increasing time values for slow and fast timers. 263 */ 264 extern u_int pfslowtimo_now; 265 extern u_int pffasttimo_now; 266 267 #define PRT_SLOW_ARM(t, nticks) (t) = (pfslowtimo_now + (nticks)) 268 #define PRT_FAST_ARM(t, nticks) (t) = (pffasttimo_now + (nticks)) 269 270 #define PRT_SLOW_DISARM(t) (t) = 0 271 #define PRT_FAST_DISARM(t) (t) = 0 272 273 #define PRT_SLOW_ISARMED(t) ((t) != 0) 274 #define PRT_FAST_ISARMED(t) ((t) != 0) 275 276 #define PRT_SLOW_ISEXPIRED(t) (PRT_SLOW_ISARMED((t)) && (t) <= pfslowtimo_now) 277 #define PRT_FAST_ISEXPIRED(t) (PRT_FAST_ISARMED((t)) && (t) <= pffasttimo_now) 278 279 struct sockaddr; 280 const struct protosw *pffindproto(int, int, int); 281 const struct protosw *pffindtype(int, int); 282 struct domain *pffinddomain(int); 283 void pfctlinput(int, const struct sockaddr *); 284 void pfctlinput2(int, const struct sockaddr *, void *); 285 286 /* 287 * Wrappers for non-MPSAFE protocols 288 */ 289 #include <sys/systm.h> /* kernel_lock */ 290 291 #define PR_WRAP_USRREQS(name) \ 292 static int \ 293 name##_attach_wrapper(struct socket *a, int b) \ 294 { \ 295 int rv; \ 296 KERNEL_LOCK(1, NULL); \ 297 rv = name##_attach(a, b); \ 298 KERNEL_UNLOCK_ONE(NULL); \ 299 return rv; \ 300 } \ 301 static void \ 302 name##_detach_wrapper(struct socket *a) \ 303 { \ 304 KERNEL_LOCK(1, NULL); \ 305 name##_detach(a); \ 306 KERNEL_UNLOCK_ONE(NULL); \ 307 } \ 308 static int \ 309 name##_accept_wrapper(struct socket *a, \ 310 struct sockaddr *b) \ 311 { \ 312 int rv; \ 313 KERNEL_LOCK(1, NULL); \ 314 rv = name##_accept(a, b); \ 315 KERNEL_UNLOCK_ONE(NULL); \ 316 return rv; \ 317 } \ 318 static int \ 319 name##_bind_wrapper(struct socket *a, \ 320 struct sockaddr *b, struct lwp *c) \ 321 { \ 322 int rv; \ 323 KERNEL_LOCK(1, NULL); \ 324 rv = name##_bind(a, b, c); \ 325 KERNEL_UNLOCK_ONE(NULL); \ 326 return rv; \ 327 } \ 328 static int \ 329 name##_connect_wrapper(struct socket *a, \ 330 struct sockaddr *b, struct lwp *c) \ 331 { \ 332 int rv; \ 333 KERNEL_LOCK(1, NULL); \ 334 rv = name##_connect(a, b, c); \ 335 KERNEL_UNLOCK_ONE(NULL); \ 336 return rv; \ 337 } \ 338 static int \ 339 name##_connect2_wrapper(struct socket *a, \ 340 struct socket *b) \ 341 { \ 342 int rv; \ 343 KERNEL_LOCK(1, NULL); \ 344 rv = name##_connect2(a, b); \ 345 KERNEL_UNLOCK_ONE(NULL); \ 346 return rv; \ 347 } \ 348 static int \ 349 name##_listen_wrapper(struct socket *a, struct lwp *b) \ 350 { \ 351 int rv; \ 352 KERNEL_LOCK(1, NULL); \ 353 rv = name##_listen(a, b); \ 354 KERNEL_UNLOCK_ONE(NULL); \ 355 return rv; \ 356 } \ 357 static int \ 358 name##_disconnect_wrapper(struct socket *a) \ 359 { \ 360 int rv; \ 361 KERNEL_LOCK(1, NULL); \ 362 rv = name##_disconnect(a); \ 363 KERNEL_UNLOCK_ONE(NULL); \ 364 return rv; \ 365 } \ 366 static int \ 367 name##_shutdown_wrapper(struct socket *a) \ 368 { \ 369 int rv; \ 370 KERNEL_LOCK(1, NULL); \ 371 rv = name##_shutdown(a); \ 372 KERNEL_UNLOCK_ONE(NULL); \ 373 return rv; \ 374 } \ 375 static int \ 376 name##_abort_wrapper(struct socket *a) \ 377 { \ 378 int rv; \ 379 KERNEL_LOCK(1, NULL); \ 380 rv = name##_abort(a); \ 381 KERNEL_UNLOCK_ONE(NULL); \ 382 return rv; \ 383 } \ 384 static int \ 385 name##_ioctl_wrapper(struct socket *a, u_long b, \ 386 void *c, struct ifnet *d) \ 387 { \ 388 int rv; \ 389 KERNEL_LOCK(1, NULL); \ 390 rv = name##_ioctl(a, b, c, d); \ 391 KERNEL_UNLOCK_ONE(NULL); \ 392 return rv; \ 393 } \ 394 static int \ 395 name##_stat_wrapper(struct socket *a, struct stat *b) \ 396 { \ 397 int rv; \ 398 KERNEL_LOCK(1, NULL); \ 399 rv = name##_stat(a, b); \ 400 KERNEL_UNLOCK_ONE(NULL); \ 401 return rv; \ 402 } \ 403 static int \ 404 name##_peeraddr_wrapper(struct socket *a, \ 405 struct sockaddr *b) \ 406 { \ 407 int rv; \ 408 KERNEL_LOCK(1, NULL); \ 409 rv = name##_peeraddr(a, b); \ 410 KERNEL_UNLOCK_ONE(NULL); \ 411 return rv; \ 412 } \ 413 static int \ 414 name##_sockaddr_wrapper(struct socket *a, \ 415 struct sockaddr *b) \ 416 { \ 417 int rv; \ 418 KERNEL_LOCK(1, NULL); \ 419 rv = name##_sockaddr(a, b); \ 420 KERNEL_UNLOCK_ONE(NULL); \ 421 return rv; \ 422 } \ 423 static int \ 424 name##_rcvd_wrapper(struct socket *a, int b, \ 425 struct lwp *c) \ 426 { \ 427 int rv; \ 428 KERNEL_LOCK(1, NULL); \ 429 rv = name##_rcvd(a, b, c); \ 430 KERNEL_UNLOCK_ONE(NULL); \ 431 return rv; \ 432 } \ 433 static int \ 434 name##_recvoob_wrapper(struct socket *a, \ 435 struct mbuf *b, int c) \ 436 { \ 437 int rv; \ 438 KERNEL_LOCK(1, NULL); \ 439 rv = name##_recvoob(a, b, c); \ 440 KERNEL_UNLOCK_ONE(NULL); \ 441 return rv; \ 442 } \ 443 static int \ 444 name##_send_wrapper(struct socket *a, struct mbuf *b, \ 445 struct sockaddr *c, struct mbuf *d, struct lwp *e) \ 446 { \ 447 int rv; \ 448 KERNEL_LOCK(1, NULL); \ 449 rv = name##_send(a, b, c, d, e); \ 450 KERNEL_UNLOCK_ONE(NULL); \ 451 return rv; \ 452 } \ 453 static int \ 454 name##_sendoob_wrapper(struct socket *a, \ 455 struct mbuf *b, struct mbuf *c) \ 456 { \ 457 int rv; \ 458 KERNEL_LOCK(1, NULL); \ 459 rv = name##_sendoob(a, b, c); \ 460 KERNEL_UNLOCK_ONE(NULL); \ 461 return rv; \ 462 } \ 463 static int \ 464 name##_purgeif_wrapper(struct socket *a, \ 465 struct ifnet *b) \ 466 { \ 467 int rv; \ 468 KERNEL_LOCK(1, NULL); \ 469 rv = name##_purgeif(a, b); \ 470 KERNEL_UNLOCK_ONE(NULL); \ 471 return rv; \ 472 } 473 474 #define PR_WRAP_CTLOUTPUT(name) \ 475 static int \ 476 name##_wrapper(int a, struct socket *b, \ 477 struct sockopt *c) \ 478 { \ 479 int rv; \ 480 KERNEL_LOCK(1, NULL); \ 481 rv = name(a, b, c); \ 482 KERNEL_UNLOCK_ONE(NULL); \ 483 return rv; \ 484 } 485 486 #define PR_WRAP_CTLINPUT(name) \ 487 static void * \ 488 name##_wrapper(int a, const struct sockaddr *b, void *c)\ 489 { \ 490 void *rv; \ 491 KERNEL_LOCK(1, NULL); \ 492 rv = name(a, b, c); \ 493 KERNEL_UNLOCK_ONE(NULL); \ 494 return rv; \ 495 } 496 497 #include <sys/socketvar.h> /* for softnet_lock */ 498 499 #define PR_WRAP_INPUT(name) \ 500 static void \ 501 name##_wrapper(struct mbuf *m, int off, int proto) \ 502 { \ 503 mutex_enter(softnet_lock); \ 504 name(m, off, proto); \ 505 mutex_exit(softnet_lock); \ 506 } 507 508 #endif /* _KERNEL */ 509 510 #endif /* !_SYS_PROTOSW_H_ */ 511