can_pcb.c revision 1.3
1 /* $NetBSD: can_pcb.c,v 1.3 2017/05/30 13:30:51 bouyer Exp $ */ 2 3 /*- 4 * Copyright (c) 2003, 2017 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Robert Swindells and Manuel Bouyer 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __KERNEL_RCSID(0, "$NetBSD: can_pcb.c,v 1.3 2017/05/30 13:30:51 bouyer Exp $"); 34 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/malloc.h> 38 #include <sys/kmem.h> 39 #include <sys/mbuf.h> 40 #include <sys/protosw.h> 41 #include <sys/socket.h> 42 #include <sys/socketvar.h> 43 #include <sys/ioctl.h> 44 #include <sys/errno.h> 45 #include <sys/time.h> 46 #include <sys/pool.h> 47 #include <sys/proc.h> 48 49 #include <net/if.h> 50 #include <net/route.h> 51 52 #include <netcan/can.h> 53 #include <netcan/can_var.h> 54 #include <netcan/can_pcb.h> 55 56 #define CANPCBHASH_BIND(table, ifindex) \ 57 &(table)->canpt_bindhashtbl[ \ 58 (ifindex) & (table)->canpt_bindhash] 59 #define CANPCBHASH_CONNECT(table, ifindex) \ 60 &(table)->canpt_connecthashtbl[ \ 61 (ifindex) & (table)->canpt_bindhash] 62 63 struct pool canpcb_pool; 64 65 void 66 can_pcbinit(struct canpcbtable *table, int bindhashsize, int connecthashsize) 67 { 68 static int canpcb_pool_initialized; 69 70 if (canpcb_pool_initialized == 0) { 71 pool_init(&canpcb_pool, sizeof(struct canpcb), 0, 0, 0, 72 "canpcbpl", NULL, IPL_SOFTNET); 73 canpcb_pool_initialized = 1; 74 } 75 76 TAILQ_INIT(&table->canpt_queue); 77 table->canpt_bindhashtbl = hashinit(bindhashsize, HASH_LIST, true, 78 &table->canpt_bindhash); 79 table->canpt_connecthashtbl = hashinit(connecthashsize, HASH_LIST, 80 true, &table->canpt_connecthash); 81 } 82 83 int 84 can_pcballoc(struct socket *so, void *v) 85 { 86 struct canpcbtable *table = v; 87 struct canpcb *canp; 88 struct can_filter *can_init_filter; 89 int s; 90 91 can_init_filter = kmem_alloc(sizeof(struct can_filter), KM_NOSLEEP); 92 if (can_init_filter == NULL) 93 return (ENOBUFS); 94 can_init_filter->can_id = 0; 95 can_init_filter->can_mask = 0; /* accept all by default */ 96 97 s = splnet(); 98 canp = pool_get(&canpcb_pool, PR_NOWAIT); 99 splx(s); 100 if (canp == NULL) { 101 kmem_free(can_init_filter, sizeof(struct can_filter)); 102 return (ENOBUFS); 103 } 104 memset(canp, 0, sizeof(*canp)); 105 canp->canp_table = table; 106 canp->canp_socket = so; 107 canp->canp_filters = can_init_filter; 108 canp->canp_nfilters = 1; 109 mutex_init(&canp->canp_mtx, MUTEX_DEFAULT, IPL_NET); 110 canp->canp_refcount = 1; 111 112 so->so_pcb = canp; 113 mutex_enter(&canp->canp_mtx); 114 TAILQ_INSERT_HEAD(&table->canpt_queue, canp, canp_queue); 115 can_pcbstate(canp, CANP_ATTACHED); 116 mutex_exit(&canp->canp_mtx); 117 return (0); 118 } 119 120 int 121 can_pcbbind(void *v, struct sockaddr_can *scan, struct lwp *l) 122 { 123 struct canpcb *canp = v; 124 125 if (scan->can_family != AF_CAN) 126 return (EAFNOSUPPORT); 127 mutex_enter(&canp->canp_mtx); 128 if (scan->can_ifindex != 0) { 129 canp->canp_ifp = if_byindex(scan->can_ifindex); 130 if (canp->canp_ifp == NULL) 131 return (EADDRNOTAVAIL); 132 soisconnected(canp->canp_socket); 133 } else { 134 canp->canp_ifp = NULL; 135 canp->canp_socket->so_state &= ~SS_ISCONNECTED; /* XXX */ 136 } 137 can_pcbstate(canp, CANP_BOUND); 138 mutex_exit(&canp->canp_mtx); 139 return 0; 140 } 141 142 /* 143 * Connect from a socket to a specified address. 144 */ 145 int 146 can_pcbconnect(void *v, struct sockaddr_can *scan) 147 { 148 #if 0 149 struct canpcb *canp = v; 150 struct sockaddr_can *ifaddr = NULL; 151 int error; 152 #endif 153 154 if (scan->can_family != AF_CAN) 155 return (EAFNOSUPPORT); 156 #if 0 157 mutex_enter(&canp->canp_mtx); 158 memcpy(&canp->canp_dst, scan, sizeof(struct sockaddr_can)); 159 can_pcbstate(canp, CANP_CONNECTED); 160 mutex_exit(&canp->canp_mtx); 161 return 0; 162 #endif 163 return EOPNOTSUPP; 164 } 165 166 void 167 can_pcbdisconnect(void *v) 168 { 169 struct canpcb *canp = v; 170 171 mutex_enter(&canp->canp_mtx); 172 can_pcbstate(canp, CANP_DETACHED); 173 mutex_exit(&canp->canp_mtx); 174 if (canp->canp_socket->so_state & SS_NOFDREF) 175 can_pcbdetach(canp); 176 } 177 178 void 179 can_pcbdetach(void *v) 180 { 181 struct canpcb *canp = v; 182 struct socket *so = canp->canp_socket; 183 184 KASSERT(mutex_owned(softnet_lock)); 185 so->so_pcb = NULL; 186 mutex_enter(&canp->canp_mtx); 187 can_pcbstate(canp, CANP_DETACHED); 188 can_pcbsetfilter(canp, NULL, 0); 189 mutex_exit(&canp->canp_mtx); 190 TAILQ_REMOVE(&canp->canp_table->canpt_queue, canp, canp_queue); 191 sofree(so); /* sofree drops the softnet_lock */ 192 canp_unref(canp); 193 mutex_enter(softnet_lock); 194 } 195 196 void 197 canp_ref(struct canpcb *canp) 198 { 199 KASSERT(mutex_owned(&canp->canp_mtx)); 200 canp->canp_refcount++; 201 } 202 203 void 204 canp_unref(struct canpcb *canp) 205 { 206 mutex_enter(&canp->canp_mtx); 207 canp->canp_refcount--; 208 KASSERT(canp->canp_refcount >= 0); 209 if (canp->canp_refcount > 0) { 210 mutex_exit(&canp->canp_mtx); 211 return; 212 } 213 mutex_exit(&canp->canp_mtx); 214 mutex_destroy(&canp->canp_mtx); 215 pool_put(&canpcb_pool, canp); 216 } 217 218 void 219 can_setsockaddr(struct canpcb *canp, struct sockaddr_can *scan) 220 { 221 222 mutex_enter(&canp->canp_mtx); 223 memset(scan, 0, sizeof (*scan)); 224 scan->can_family = AF_CAN; 225 scan->can_len = sizeof(*scan); 226 if (canp->canp_ifp) 227 scan->can_ifindex = canp->canp_ifp->if_index; 228 else 229 scan->can_ifindex = 0; 230 mutex_exit(&canp->canp_mtx); 231 } 232 233 int 234 can_pcbsetfilter(struct canpcb *canp, struct can_filter *fp, int nfilters) 235 { 236 237 struct can_filter *newf; 238 KASSERT(mutex_owned(&canp->canp_mtx)); 239 240 if (nfilters > 0) { 241 newf = 242 kmem_alloc(sizeof(struct can_filter) * nfilters, KM_SLEEP); 243 if (newf == NULL) 244 return ENOMEM; 245 memcpy(newf, fp, sizeof(struct can_filter) * nfilters); 246 } else { 247 newf = NULL; 248 } 249 if (canp->canp_filters != NULL) { 250 kmem_free(canp->canp_filters, 251 sizeof(struct can_filter) * canp->canp_nfilters); 252 } 253 canp->canp_filters = newf; 254 canp->canp_nfilters = nfilters; 255 return 0; 256 } 257 258 259 260 #if 0 261 /* 262 * Pass some notification to all connections of a protocol 263 * associated with address dst. The local address and/or port numbers 264 * may be specified to limit the search. The "usual action" will be 265 * taken, depending on the ctlinput cmd. The caller must filter any 266 * cmds that are uninteresting (e.g., no error in the map). 267 * Call the protocol specific routine (if any) to report 268 * any errors for each matching socket. 269 * 270 * Must be called at splsoftnet. 271 */ 272 int 273 can_pcbnotify(struct canpcbtable *table, u_int32_t faddr, u_int32_t laddr, 274 int errno, void (*notify)(struct canpcb *, int)) 275 { 276 struct canpcbhead *head; 277 struct canpcb *canp, *ncanp; 278 int nmatch; 279 280 if (faddr == 0 || notify == 0) 281 return (0); 282 283 nmatch = 0; 284 head = CANPCBHASH_CONNECT(table, faddr, laddr); 285 for (canp = LIST_FIRST(head); canp != NULL; canp = ncanp) { 286 ncanp = LIST_NEXT(canp, canp_hash); 287 if (canp->canp_faddr == faddr && 288 canp->canp_laddr == laddr) { 289 (*notify)(canp, errno); 290 nmatch++; 291 } 292 } 293 return (nmatch); 294 } 295 296 void 297 can_pcbnotifyall(struct canpcbtable *table, u_int32_t faddr, int errno, 298 void (*notify)(struct canpcb *, int)) 299 { 300 struct canpcb *canp, *ncanp; 301 302 if (faddr == 0 || notify == 0) 303 return; 304 305 TAILQ_FOREACH_SAFE(canp, &table->canpt_queue, canp_queue, ncanp) { 306 if (canp->canp_faddr == faddr) 307 (*notify)(canp, errno); 308 } 309 } 310 #endif 311 312 #if 0 313 void 314 can_pcbpurgeif0(struct canpcbtable *table, struct ifnet *ifp) 315 { 316 struct canpcb *canp, *ncanp; 317 struct ip_moptions *imo; 318 int i, gap; 319 320 } 321 322 void 323 can_pcbpurgeif(struct canpcbtable *table, struct ifnet *ifp) 324 { 325 struct canpcb *canp, *ncanp; 326 327 for (canp = CIRCLEQ_FIRST(&table->canpt_queue); 328 canp != (void *)&table->canpt_queue; 329 canp = ncanp) { 330 ncanp = CIRCLEQ_NEXT(canp, canp_queue); 331 } 332 } 333 #endif 334 335 336 337 void 338 can_pcbstate(struct canpcb *canp, int state) 339 { 340 int ifindex = canp->canp_ifp ? canp->canp_ifp->if_index : 0; 341 KASSERT(mutex_owned(&canp->canp_mtx)); 342 343 if (canp->canp_state > CANP_ATTACHED) 344 LIST_REMOVE(canp, canp_hash); 345 346 switch (state) { 347 case CANP_BOUND: 348 LIST_INSERT_HEAD(CANPCBHASH_BIND(canp->canp_table, 349 ifindex), canp, canp_hash); 350 break; 351 case CANP_CONNECTED: 352 LIST_INSERT_HEAD(CANPCBHASH_CONNECT(canp->canp_table, 353 ifindex), canp, canp_hash); 354 break; 355 } 356 357 canp->canp_state = state; 358 } 359 360 /* 361 * check mbuf against socket accept filter. 362 * returns true if mbuf is accepted, false otherwise 363 */ 364 bool 365 can_pcbfilter(struct canpcb *canp, struct mbuf *m) 366 { 367 int i; 368 struct can_frame *fmp; 369 struct can_filter *fip; 370 371 KASSERT(mutex_owned(&canp->canp_mtx)); 372 KASSERT((m->m_flags & M_PKTHDR) != 0); 373 KASSERT(m->m_len == m->m_pkthdr.len); 374 375 fmp = mtod(m, struct can_frame *); 376 for (i = 0; i < canp->canp_nfilters; i++) { 377 fip = &canp->canp_filters[i]; 378 if ((fmp->can_id & fip->can_mask) == fip->can_id) 379 return true; 380 } 381 /* no match */ 382 return false; 383 } 384
Indexes created Mon Sep 22 13:09:51 GMT 2025