can_pcb.c revision 1.6.4.2
1 /* $NetBSD: can_pcb.c,v 1.6.4.2 2017/08/28 17:53:12 skrll 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 1.6.4.2 2017/08/28 17:53:12 skrll 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 canp->canp_ifp->if_dlt != DLT_CAN_SOCKETCAN) { 132 canp->canp_ifp = NULL; 133 mutex_exit(&canp->canp_mtx); 134 return (EADDRNOTAVAIL); 135 } 136 soisconnected(canp->canp_socket); 137 } else { 138 canp->canp_ifp = NULL; 139 canp->canp_socket->so_state &= ~SS_ISCONNECTED; /* XXX */ 140 } 141 can_pcbstate(canp, CANP_BOUND); 142 mutex_exit(&canp->canp_mtx); 143 return 0; 144 } 145 146 /* 147 * Connect from a socket to a specified address. 148 */ 149 int 150 can_pcbconnect(void *v, struct sockaddr_can *scan) 151 { 152 #if 0 153 struct canpcb *canp = v; 154 struct sockaddr_can *ifaddr = NULL; 155 int error; 156 #endif 157 158 if (scan->can_family != AF_CAN) 159 return (EAFNOSUPPORT); 160 #if 0 161 mutex_enter(&canp->canp_mtx); 162 memcpy(&canp->canp_dst, scan, sizeof(struct sockaddr_can)); 163 can_pcbstate(canp, CANP_CONNECTED); 164 mutex_exit(&canp->canp_mtx); 165 return 0; 166 #endif 167 return EOPNOTSUPP; 168 } 169 170 void 171 can_pcbdisconnect(void *v) 172 { 173 struct canpcb *canp = v; 174 175 mutex_enter(&canp->canp_mtx); 176 can_pcbstate(canp, CANP_DETACHED); 177 mutex_exit(&canp->canp_mtx); 178 if (canp->canp_socket->so_state & SS_NOFDREF) 179 can_pcbdetach(canp); 180 } 181 182 void 183 can_pcbdetach(void *v) 184 { 185 struct canpcb *canp = v; 186 struct socket *so = canp->canp_socket; 187 188 KASSERT(mutex_owned(softnet_lock)); 189 so->so_pcb = NULL; 190 mutex_enter(&canp->canp_mtx); 191 can_pcbstate(canp, CANP_DETACHED); 192 can_pcbsetfilter(canp, NULL, 0); 193 mutex_exit(&canp->canp_mtx); 194 TAILQ_REMOVE(&canp->canp_table->canpt_queue, canp, canp_queue); 195 sofree(so); /* sofree drops the softnet_lock */ 196 canp_unref(canp); 197 mutex_enter(softnet_lock); 198 } 199 200 void 201 canp_ref(struct canpcb *canp) 202 { 203 KASSERT(mutex_owned(&canp->canp_mtx)); 204 canp->canp_refcount++; 205 } 206 207 void 208 canp_unref(struct canpcb *canp) 209 { 210 mutex_enter(&canp->canp_mtx); 211 canp->canp_refcount--; 212 KASSERT(canp->canp_refcount >= 0); 213 if (canp->canp_refcount > 0) { 214 mutex_exit(&canp->canp_mtx); 215 return; 216 } 217 mutex_exit(&canp->canp_mtx); 218 mutex_destroy(&canp->canp_mtx); 219 pool_put(&canpcb_pool, canp); 220 } 221 222 void 223 can_setsockaddr(struct canpcb *canp, struct sockaddr_can *scan) 224 { 225 226 mutex_enter(&canp->canp_mtx); 227 memset(scan, 0, sizeof (*scan)); 228 scan->can_family = AF_CAN; 229 scan->can_len = sizeof(*scan); 230 if (canp->canp_ifp) 231 scan->can_ifindex = canp->canp_ifp->if_index; 232 else 233 scan->can_ifindex = 0; 234 mutex_exit(&canp->canp_mtx); 235 } 236 237 int 238 can_pcbsetfilter(struct canpcb *canp, struct can_filter *fp, int nfilters) 239 { 240 241 struct can_filter *newf; 242 KASSERT(mutex_owned(&canp->canp_mtx)); 243 244 if (nfilters > 0) { 245 newf = 246 kmem_alloc(sizeof(struct can_filter) * nfilters, KM_SLEEP); 247 memcpy(newf, fp, sizeof(struct can_filter) * nfilters); 248 } else { 249 newf = NULL; 250 } 251 if (canp->canp_filters != NULL) { 252 kmem_free(canp->canp_filters, 253 sizeof(struct can_filter) * canp->canp_nfilters); 254 } 255 canp->canp_filters = newf; 256 canp->canp_nfilters = nfilters; 257 return 0; 258 } 259 260 261 262 #if 0 263 /* 264 * Pass some notification to all connections of a protocol 265 * associated with address dst. The local address and/or port numbers 266 * may be specified to limit the search. The "usual action" will be 267 * taken, depending on the ctlinput cmd. The caller must filter any 268 * cmds that are uninteresting (e.g., no error in the map). 269 * Call the protocol specific routine (if any) to report 270 * any errors for each matching socket. 271 * 272 * Must be called at splsoftnet. 273 */ 274 int 275 can_pcbnotify(struct canpcbtable *table, u_int32_t faddr, u_int32_t laddr, 276 int errno, void (*notify)(struct canpcb *, int)) 277 { 278 struct canpcbhead *head; 279 struct canpcb *canp, *ncanp; 280 int nmatch; 281 282 if (faddr == 0 || notify == 0) 283 return (0); 284 285 nmatch = 0; 286 head = CANPCBHASH_CONNECT(table, faddr, laddr); 287 for (canp = LIST_FIRST(head); canp != NULL; canp = ncanp) { 288 ncanp = LIST_NEXT(canp, canp_hash); 289 if (canp->canp_faddr == faddr && 290 canp->canp_laddr == laddr) { 291 (*notify)(canp, errno); 292 nmatch++; 293 } 294 } 295 return (nmatch); 296 } 297 298 void 299 can_pcbnotifyall(struct canpcbtable *table, u_int32_t faddr, int errno, 300 void (*notify)(struct canpcb *, int)) 301 { 302 struct canpcb *canp, *ncanp; 303 304 if (faddr == 0 || notify == 0) 305 return; 306 307 TAILQ_FOREACH_SAFE(canp, &table->canpt_queue, canp_queue, ncanp) { 308 if (canp->canp_faddr == faddr) 309 (*notify)(canp, errno); 310 } 311 } 312 #endif 313 314 #if 0 315 void 316 can_pcbpurgeif0(struct canpcbtable *table, struct ifnet *ifp) 317 { 318 struct canpcb *canp, *ncanp; 319 struct ip_moptions *imo; 320 int i, gap; 321 322 } 323 324 void 325 can_pcbpurgeif(struct canpcbtable *table, struct ifnet *ifp) 326 { 327 struct canpcb *canp, *ncanp; 328 329 for (canp = CIRCLEQ_FIRST(&table->canpt_queue); 330 canp != (void *)&table->canpt_queue; 331 canp = ncanp) { 332 ncanp = CIRCLEQ_NEXT(canp, canp_queue); 333 } 334 } 335 #endif 336 337 338 339 void 340 can_pcbstate(struct canpcb *canp, int state) 341 { 342 int ifindex = canp->canp_ifp ? canp->canp_ifp->if_index : 0; 343 KASSERT(mutex_owned(&canp->canp_mtx)); 344 345 if (canp->canp_state > CANP_ATTACHED) 346 LIST_REMOVE(canp, canp_hash); 347 348 switch (state) { 349 case CANP_BOUND: 350 LIST_INSERT_HEAD(CANPCBHASH_BIND(canp->canp_table, 351 ifindex), canp, canp_hash); 352 break; 353 case CANP_CONNECTED: 354 LIST_INSERT_HEAD(CANPCBHASH_CONNECT(canp->canp_table, 355 ifindex), canp, canp_hash); 356 break; 357 } 358 359 canp->canp_state = state; 360 } 361 362 /* 363 * check mbuf against socket accept filter. 364 * returns true if mbuf is accepted, false otherwise 365 */ 366 bool 367 can_pcbfilter(struct canpcb *canp, struct mbuf *m) 368 { 369 int i; 370 struct can_frame *fmp; 371 struct can_filter *fip; 372 373 KASSERT(mutex_owned(&canp->canp_mtx)); 374 KASSERT((m->m_flags & M_PKTHDR) != 0); 375 KASSERT(m->m_len == m->m_pkthdr.len); 376 377 fmp = mtod(m, struct can_frame *); 378 for (i = 0; i < canp->canp_nfilters; i++) { 379 fip = &canp->canp_filters[i]; 380 if ((fmp->can_id & fip->can_mask) == fip->can_id) 381 return true; 382 } 383 /* no match */ 384 return false; 385 } 386
Indexes created Mon Oct 13 00:09:54 GMT 2025