1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2012 Chelsio Communications, Inc. 5 * All rights reserved. 6 * Written by: Navdeep Parhar <np@FreeBSD.org> 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 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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 30 #include <sys/cdefs.h> 31 __FBSDID("$FreeBSD$"); 32 33 #include "opt_inet.h" 34 #include "opt_inet6.h" 35 36 #include <sys/types.h> 37 #include <sys/ck.h> 38 #include <sys/eventhandler.h> 39 #include <sys/malloc.h> 40 #include <sys/rmlock.h> 41 #include <sys/sbuf.h> 42 #include <sys/socket.h> 43 #include <sys/taskqueue.h> 44 #include <net/if.h> 45 #include <net/if_var.h> 46 #include <netinet/in.h> 47 #include <netinet6/in6_var.h> 48 #include <netinet6/scope6_var.h> 49 50 #include "common/common.h" 51 #include "t4_clip.h" 52 53 #if defined(INET6) 54 static int add_lip(struct adapter *, struct in6_addr *); 55 static int delete_lip(struct adapter *, struct in6_addr *); 56 static struct clip_entry *search_lip(struct adapter *, struct in6_addr *); 57 static void update_clip(struct adapter *, void *); 58 static void t4_clip_task(void *, int); 59 static void update_clip_table(struct adapter *); 60 61 static int in6_ifaddr_gen; 62 static eventhandler_tag ifaddr_evhandler; 63 static struct timeout_task clip_task; 64 65 static int 66 add_lip(struct adapter *sc, struct in6_addr *lip) 67 { 68 struct fw_clip_cmd c; 69 70 ASSERT_SYNCHRONIZED_OP(sc); 71 mtx_assert(&sc->clip_table_lock, MA_OWNED); 72 73 memset(&c, 0, sizeof(c)); 74 c.op_to_write = htonl(V_FW_CMD_OP(FW_CLIP_CMD) | F_FW_CMD_REQUEST | 75 F_FW_CMD_WRITE); 76 c.alloc_to_len16 = htonl(F_FW_CLIP_CMD_ALLOC | FW_LEN16(c)); 77 c.ip_hi = *(uint64_t *)&lip->s6_addr[0]; 78 c.ip_lo = *(uint64_t *)&lip->s6_addr[8]; 79 80 return (-t4_wr_mbox_ns(sc, sc->mbox, &c, sizeof(c), &c)); 81 } 82 83 static int 84 delete_lip(struct adapter *sc, struct in6_addr *lip) 85 { 86 struct fw_clip_cmd c; 87 88 ASSERT_SYNCHRONIZED_OP(sc); 89 mtx_assert(&sc->clip_table_lock, MA_OWNED); 90 91 memset(&c, 0, sizeof(c)); 92 c.op_to_write = htonl(V_FW_CMD_OP(FW_CLIP_CMD) | F_FW_CMD_REQUEST | 93 F_FW_CMD_READ); 94 c.alloc_to_len16 = htonl(F_FW_CLIP_CMD_FREE | FW_LEN16(c)); 95 c.ip_hi = *(uint64_t *)&lip->s6_addr[0]; 96 c.ip_lo = *(uint64_t *)&lip->s6_addr[8]; 97 98 return (-t4_wr_mbox_ns(sc, sc->mbox, &c, sizeof(c), &c)); 99 } 100 101 static struct clip_entry * 102 search_lip(struct adapter *sc, struct in6_addr *lip) 103 { 104 struct clip_entry *ce; 105 106 mtx_assert(&sc->clip_table_lock, MA_OWNED); 107 108 TAILQ_FOREACH(ce, &sc->clip_table, link) { 109 if (IN6_ARE_ADDR_EQUAL(&ce->lip, lip)) 110 return (ce); 111 } 112 113 return (NULL); 114 } 115 #endif 116 117 struct clip_entry * 118 t4_hold_lip(struct adapter *sc, struct in6_addr *lip, struct clip_entry *ce) 119 { 120 121 #ifdef INET6 122 mtx_lock(&sc->clip_table_lock); 123 if (ce == NULL) 124 ce = search_lip(sc, lip); 125 if (ce != NULL) 126 ce->refcount++; 127 mtx_unlock(&sc->clip_table_lock); 128 129 return (ce); 130 #else 131 return (NULL); 132 #endif 133 } 134 135 void 136 t4_release_lip(struct adapter *sc, struct clip_entry *ce) 137 { 138 139 #ifdef INET6 140 mtx_lock(&sc->clip_table_lock); 141 KASSERT(search_lip(sc, &ce->lip) == ce, 142 ("%s: CLIP entry %p p not in CLIP table.", __func__, ce)); 143 KASSERT(ce->refcount > 0, 144 ("%s: CLIP entry %p has refcount 0", __func__, ce)); 145 --ce->refcount; 146 mtx_unlock(&sc->clip_table_lock); 147 #endif 148 } 149 150 #ifdef INET6 151 void 152 t4_init_clip_table(struct adapter *sc) 153 { 154 155 mtx_init(&sc->clip_table_lock, "CLIP table lock", NULL, MTX_DEF); 156 TAILQ_INIT(&sc->clip_table); 157 sc->clip_gen = -1; 158 159 /* 160 * Don't bother forcing an update of the clip table when the 161 * adapter is initialized. Before an interface can be used it 162 * must be assigned an address which will trigger the event 163 * handler to update the table. 164 */ 165 } 166 167 static void 168 update_clip(struct adapter *sc, void *arg __unused) 169 { 170 171 if (begin_synchronized_op(sc, NULL, HOLD_LOCK, "t4clip")) 172 return; 173 174 if (mtx_initialized(&sc->clip_table_lock)) 175 update_clip_table(sc); 176 177 end_synchronized_op(sc, LOCK_HELD); 178 } 179 180 static void 181 t4_clip_task(void *arg, int count) 182 { 183 184 t4_iterate(update_clip, NULL); 185 } 186 187 static void 188 update_clip_table(struct adapter *sc) 189 { 190 struct rm_priotracker in6_ifa_tracker; 191 struct in6_ifaddr *ia; 192 struct in6_addr *lip, tlip; 193 TAILQ_HEAD(, clip_entry) stale; 194 struct clip_entry *ce, *ce_temp; 195 struct vi_info *vi; 196 int rc, gen, i, j; 197 uintptr_t last_vnet; 198 199 ASSERT_SYNCHRONIZED_OP(sc); 200 201 IN6_IFADDR_RLOCK(&in6_ifa_tracker); 202 mtx_lock(&sc->clip_table_lock); 203 204 gen = atomic_load_acq_int(&in6_ifaddr_gen); 205 if (gen == sc->clip_gen) 206 goto done; 207 208 TAILQ_INIT(&stale); 209 TAILQ_CONCAT(&stale, &sc->clip_table, link); 210 211 /* 212 * last_vnet optimizes the common cases where all if_vnet = NULL (no 213 * VIMAGE) or all if_vnet = vnet0. 214 */ 215 last_vnet = (uintptr_t)(-1); 216 for_each_port(sc, i) 217 for_each_vi(sc->port[i], j, vi) { 218 if (last_vnet == (uintptr_t)vi->ifp->if_vnet) 219 continue; 220 221 /* XXX: races with if_vmove */ 222 CURVNET_SET(vi->ifp->if_vnet); 223 CK_STAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) { 224 lip = &ia->ia_addr.sin6_addr; 225 226 KASSERT(!IN6_IS_ADDR_MULTICAST(lip), 227 ("%s: mcast address in in6_ifaddr list", __func__)); 228 229 if (IN6_IS_ADDR_LOOPBACK(lip)) 230 continue; 231 if (IN6_IS_SCOPE_EMBED(lip)) { 232 /* Remove the embedded scope */ 233 tlip = *lip; 234 lip = &tlip; 235 in6_clearscope(lip); 236 } 237 /* 238 * XXX: how to weed out the link local address for the 239 * loopback interface? It's fe80::1 usually (always?). 240 */ 241 242 /* 243 * If it's in the main list then we already know it's 244 * not stale. 245 */ 246 TAILQ_FOREACH(ce, &sc->clip_table, link) { 247 if (IN6_ARE_ADDR_EQUAL(&ce->lip, lip)) 248 goto next; 249 } 250 251 /* 252 * If it's in the stale list we should move it to the 253 * main list. 254 */ 255 TAILQ_FOREACH(ce, &stale, link) { 256 if (IN6_ARE_ADDR_EQUAL(&ce->lip, lip)) { 257 TAILQ_REMOVE(&stale, ce, link); 258 TAILQ_INSERT_TAIL(&sc->clip_table, ce, 259 link); 260 goto next; 261 } 262 } 263 264 /* A new IP6 address; add it to the CLIP table */ 265 ce = malloc(sizeof(*ce), M_CXGBE, M_NOWAIT); 266 memcpy(&ce->lip, lip, sizeof(ce->lip)); 267 ce->refcount = 0; 268 rc = add_lip(sc, lip); 269 if (rc == 0) 270 TAILQ_INSERT_TAIL(&sc->clip_table, ce, link); 271 else { 272 char ip[INET6_ADDRSTRLEN]; 273 274 inet_ntop(AF_INET6, &ce->lip, &ip[0], 275 sizeof(ip)); 276 log(LOG_ERR, "%s: could not add %s (%d)\n", 277 __func__, ip, rc); 278 free(ce, M_CXGBE); 279 } 280 next: 281 continue; 282 } 283 CURVNET_RESTORE(); 284 last_vnet = (uintptr_t)vi->ifp->if_vnet; 285 } 286 287 /* 288 * Remove stale addresses (those no longer in V_in6_ifaddrhead) that are 289 * no longer referenced by the driver. 290 */ 291 TAILQ_FOREACH_SAFE(ce, &stale, link, ce_temp) { 292 if (ce->refcount == 0) { 293 rc = delete_lip(sc, &ce->lip); 294 if (rc == 0) { 295 TAILQ_REMOVE(&stale, ce, link); 296 free(ce, M_CXGBE); 297 } else { 298 char ip[INET6_ADDRSTRLEN]; 299 300 inet_ntop(AF_INET6, &ce->lip, &ip[0], 301 sizeof(ip)); 302 log(LOG_ERR, "%s: could not delete %s (%d)\n", 303 __func__, ip, rc); 304 } 305 } 306 } 307 /* The ones that are still referenced need to stay in the CLIP table */ 308 TAILQ_CONCAT(&sc->clip_table, &stale, link); 309 310 sc->clip_gen = gen; 311 done: 312 mtx_unlock(&sc->clip_table_lock); 313 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 314 } 315 316 void 317 t4_destroy_clip_table(struct adapter *sc) 318 { 319 struct clip_entry *ce, *ce_temp; 320 321 if (mtx_initialized(&sc->clip_table_lock)) { 322 mtx_lock(&sc->clip_table_lock); 323 TAILQ_FOREACH_SAFE(ce, &sc->clip_table, link, ce_temp) { 324 KASSERT(ce->refcount == 0, 325 ("%s: CLIP entry %p still in use (%d)", __func__, 326 ce, ce->refcount)); 327 TAILQ_REMOVE(&sc->clip_table, ce, link); 328 #if 0 329 delete_lip(sc, &ce->lip); 330 #endif 331 free(ce, M_CXGBE); 332 } 333 mtx_unlock(&sc->clip_table_lock); 334 mtx_destroy(&sc->clip_table_lock); 335 } 336 } 337 338 static void 339 t4_tom_ifaddr_event(void *arg __unused, struct ifnet *ifp) 340 { 341 342 atomic_add_rel_int(&in6_ifaddr_gen, 1); 343 taskqueue_enqueue_timeout(taskqueue_thread, &clip_task, -hz / 4); 344 } 345 346 int 347 sysctl_clip(SYSCTL_HANDLER_ARGS) 348 { 349 struct adapter *sc = arg1; 350 struct clip_entry *ce; 351 struct sbuf *sb; 352 int rc, header = 0; 353 char ip[INET6_ADDRSTRLEN]; 354 355 rc = sysctl_wire_old_buffer(req, 0); 356 if (rc != 0) 357 return (rc); 358 359 sb = sbuf_new_for_sysctl(NULL, NULL, 4096, req); 360 if (sb == NULL) 361 return (ENOMEM); 362 363 mtx_lock(&sc->clip_table_lock); 364 TAILQ_FOREACH(ce, &sc->clip_table, link) { 365 if (header == 0) { 366 sbuf_printf(sb, "%-40s %-5s", "IP address", "Users"); 367 header = 1; 368 } 369 inet_ntop(AF_INET6, &ce->lip, &ip[0], sizeof(ip)); 370 371 sbuf_printf(sb, "\n%-40s %5u", ip, ce->refcount); 372 } 373 mtx_unlock(&sc->clip_table_lock); 374 375 rc = sbuf_finish(sb); 376 sbuf_delete(sb); 377 378 return (rc); 379 } 380 381 void 382 t4_clip_modload(void) 383 { 384 385 TIMEOUT_TASK_INIT(taskqueue_thread, &clip_task, 0, t4_clip_task, NULL); 386 ifaddr_evhandler = EVENTHANDLER_REGISTER(ifaddr_event, 387 t4_tom_ifaddr_event, NULL, EVENTHANDLER_PRI_ANY); 388 } 389 390 void 391 t4_clip_modunload(void) 392 { 393 394 EVENTHANDLER_DEREGISTER(ifaddr_event, ifaddr_evhandler); 395 taskqueue_cancel_timeout(taskqueue_thread, &clip_task, NULL); 396 } 397 #endif 398