1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 2004 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 /* 30 * This is used to support the hidden __sin6_src_id in the sockaddr_in6 31 * structure which is there to ensure that applications (such as UDP apps) 32 * which get an address from recvfrom and use that address in a sendto 33 * or connect will by default use the same source address in the "response" 34 * as the destination address in the "request" they received. 35 * 36 * This is built using some new functions (in IP - doing their own locking 37 * so they can be called from the transports) to map between integer IDs 38 * and in6_addr_t. 39 * The use applies to sockaddr_in6 - whether or not mapped addresses are used. 40 * 41 * This file contains the functions used by both IP and the transports 42 * to implement __sin6_src_id. 43 * The routines do their own locking since they are called from 44 * the transports (to map between a source id and an address) 45 * and from IP proper when IP addresses are added and removed. 46 * 47 * The routines handle both IPv4 and IPv6 with the IPv4 addresses represented 48 * as IPv4-mapped addresses. 49 */ 50 51 #include <sys/types.h> 52 #include <sys/stream.h> 53 #include <sys/dlpi.h> 54 #include <sys/stropts.h> 55 #include <sys/sysmacros.h> 56 #include <sys/strsubr.h> 57 #include <sys/strlog.h> 58 #define _SUN_TPI_VERSION 2 59 #include <sys/tihdr.h> 60 #include <sys/xti_inet.h> 61 #include <sys/ddi.h> 62 #include <sys/cmn_err.h> 63 #include <sys/debug.h> 64 #include <sys/modctl.h> 65 #include <sys/atomic.h> 66 #include <sys/zone.h> 67 68 #include <sys/systm.h> 69 #include <sys/param.h> 70 #include <sys/kmem.h> 71 #include <sys/callb.h> 72 #include <sys/socket.h> 73 #include <sys/vtrace.h> 74 #include <sys/isa_defs.h> 75 #include <sys/kmem.h> 76 #include <net/if.h> 77 #include <net/if_arp.h> 78 #include <net/route.h> 79 #include <sys/sockio.h> 80 #include <netinet/in.h> 81 #include <net/if_dl.h> 82 83 #include <inet/common.h> 84 #include <inet/mi.h> 85 #include <inet/mib2.h> 86 #include <inet/nd.h> 87 #include <inet/arp.h> 88 #include <inet/snmpcom.h> 89 90 #include <netinet/igmp_var.h> 91 #include <netinet/ip6.h> 92 #include <netinet/icmp6.h> 93 94 #include <inet/ip.h> 95 #include <inet/ip6.h> 96 #include <inet/tcp.h> 97 #include <inet/ip_multi.h> 98 #include <inet/ip_if.h> 99 #include <inet/ip_ire.h> 100 #include <inet/ip_rts.h> 101 #include <inet/optcom.h> 102 #include <inet/ip_ndp.h> 103 #include <netinet/igmp.h> 104 #include <netinet/ip_mroute.h> 105 #include <inet/ipclassifier.h> 106 107 #include <net/pfkeyv2.h> 108 #include <inet/ipsec_info.h> 109 #include <inet/sadb.h> 110 #include <sys/kmem.h> 111 #include <inet/ipsec_impl.h> 112 #include <inet/tun.h> 113 114 /* Data structure to represent addresses */ 115 struct srcid_map { 116 struct srcid_map *sm_next; 117 in6_addr_t sm_addr; /* Local address */ 118 uint_t sm_srcid; /* source id */ 119 uint_t sm_refcnt; /* > 1 ipif with same addr? */ 120 zoneid_t sm_zoneid; /* zone id */ 121 }; 122 typedef struct srcid_map srcid_map_t; 123 124 static uint_t srcid_nextid(void); 125 static srcid_map_t **srcid_lookup_addr(const in6_addr_t *addr, 126 zoneid_t zoneid); 127 static srcid_map_t **srcid_lookup_id(uint_t id); 128 129 130 /* 131 * ID used to assign next free one. 132 * Increases by one. Once it wraps we search for an unused ID. 133 */ 134 static uint_t ip_src_id = 1; 135 static boolean_t srcid_wrapped = B_FALSE; 136 137 static srcid_map_t *srcid_head; 138 krwlock_t srcid_lock; 139 140 /* 141 * Insert/add a new address to the map. 142 * Returns zero if ok; otherwise errno (e.g. for memory allocation failure). 143 */ 144 int 145 ip_srcid_insert(const in6_addr_t *addr, zoneid_t zoneid) 146 { 147 srcid_map_t **smpp; 148 #ifdef DEBUG 149 char abuf[INET6_ADDRSTRLEN]; 150 151 ip1dbg(("ip_srcid_insert(%s, %d)\n", 152 inet_ntop(AF_INET6, addr, abuf, sizeof (abuf)), zoneid)); 153 #endif 154 155 rw_enter(&srcid_lock, RW_WRITER); 156 smpp = srcid_lookup_addr(addr, zoneid); 157 if (*smpp != NULL) { 158 /* Already present - increment refcount */ 159 (*smpp)->sm_refcnt++; 160 ASSERT((*smpp)->sm_refcnt != 0); /* wraparound */ 161 rw_exit(&srcid_lock); 162 return (0); 163 } 164 /* Insert new */ 165 *smpp = kmem_alloc(sizeof (srcid_map_t), KM_NOSLEEP); 166 if (*smpp == NULL) { 167 rw_exit(&srcid_lock); 168 return (ENOMEM); 169 } 170 (*smpp)->sm_next = NULL; 171 (*smpp)->sm_addr = *addr; 172 (*smpp)->sm_srcid = srcid_nextid(); 173 (*smpp)->sm_refcnt = 1; 174 (*smpp)->sm_zoneid = zoneid; 175 176 rw_exit(&srcid_lock); 177 return (0); 178 } 179 180 /* 181 * Remove an new address from the map. 182 * Returns zero if ok; otherwise errno (e.g. for nonexistent address). 183 */ 184 int 185 ip_srcid_remove(const in6_addr_t *addr, zoneid_t zoneid) 186 { 187 srcid_map_t **smpp; 188 srcid_map_t *smp; 189 #ifdef DEBUG 190 char abuf[INET6_ADDRSTRLEN]; 191 192 ip1dbg(("ip_srcid_remove(%s, %d)\n", 193 inet_ntop(AF_INET6, addr, abuf, sizeof (abuf)), zoneid)); 194 #endif 195 196 rw_enter(&srcid_lock, RW_WRITER); 197 smpp = srcid_lookup_addr(addr, zoneid); 198 smp = *smpp; 199 if (smp == NULL) { 200 /* Not preset */ 201 rw_exit(&srcid_lock); 202 return (ENOENT); 203 } 204 205 /* Decrement refcount */ 206 ASSERT(smp->sm_refcnt != 0); 207 smp->sm_refcnt--; 208 if (smp->sm_refcnt != 0) { 209 rw_exit(&srcid_lock); 210 return (0); 211 } 212 /* Remove entry */ 213 *smpp = smp->sm_next; 214 rw_exit(&srcid_lock); 215 smp->sm_next = NULL; 216 kmem_free(smp, sizeof (srcid_map_t)); 217 return (0); 218 } 219 220 /* 221 * Map from an address to a source id. 222 * If the address is unknown return the unknown id (zero). 223 */ 224 uint_t 225 ip_srcid_find_addr(const in6_addr_t *addr, zoneid_t zoneid) 226 { 227 srcid_map_t **smpp; 228 srcid_map_t *smp; 229 uint_t id; 230 231 rw_enter(&srcid_lock, RW_READER); 232 smpp = srcid_lookup_addr(addr, zoneid); 233 smp = *smpp; 234 if (smp == NULL) { 235 char abuf[INET6_ADDRSTRLEN]; 236 237 /* Not present - could be broadcast or multicast address */ 238 ip1dbg(("ip_srcid_find_addr: unknown %s in zone %d\n", 239 inet_ntop(AF_INET6, addr, abuf, sizeof (abuf)), zoneid)); 240 id = 0; 241 } else { 242 ASSERT(smp->sm_refcnt != 0); 243 id = smp->sm_srcid; 244 } 245 rw_exit(&srcid_lock); 246 return (id); 247 } 248 249 /* 250 * Map from a source id to an address. 251 * If the id is unknown return the unspecified address. 252 */ 253 void 254 ip_srcid_find_id(uint_t id, in6_addr_t *addr, zoneid_t zoneid) 255 { 256 srcid_map_t **smpp; 257 srcid_map_t *smp; 258 259 rw_enter(&srcid_lock, RW_READER); 260 smpp = srcid_lookup_id(id); 261 smp = *smpp; 262 if (smp == NULL || smp->sm_zoneid != zoneid) { 263 /* Not preset */ 264 ip1dbg(("ip_srcid_find_id: unknown %u or in wrong zone\n", id)); 265 *addr = ipv6_all_zeros; 266 } else { 267 ASSERT(smp->sm_refcnt != 0); 268 *addr = smp->sm_addr; 269 } 270 rw_exit(&srcid_lock); 271 } 272 273 /* 274 * ndd report function 275 */ 276 /*ARGSUSED*/ 277 int 278 ip_srcid_report(queue_t *q, mblk_t *mp, caddr_t arg, cred_t *ioc_cr) 279 { 280 srcid_map_t *smp; 281 char abuf[INET6_ADDRSTRLEN]; 282 zoneid_t zoneid; 283 284 zoneid = Q_TO_CONN(q)->conn_zoneid; 285 (void) mi_mpprintf(mp, 286 "addr " 287 "id zone refcnt"); 288 rw_enter(&srcid_lock, RW_READER); 289 for (smp = srcid_head; smp != NULL; smp = smp->sm_next) { 290 if (zoneid != GLOBAL_ZONEID && zoneid != smp->sm_zoneid) 291 continue; 292 (void) mi_mpprintf(mp, "%46s %5u %5d %5u", 293 inet_ntop(AF_INET6, &smp->sm_addr, abuf, sizeof (abuf)), 294 smp->sm_srcid, smp->sm_zoneid, smp->sm_refcnt); 295 } 296 rw_exit(&srcid_lock); 297 return (0); 298 } 299 300 /* Assign the next available ID */ 301 static uint_t 302 srcid_nextid(void) 303 { 304 uint_t id; 305 srcid_map_t **smpp; 306 307 ASSERT(rw_owner(&srcid_lock) == curthread); 308 309 if (!srcid_wrapped) { 310 id = ip_src_id++; 311 if (ip_src_id == 0) 312 srcid_wrapped = B_TRUE; 313 return (id); 314 } 315 /* Once it wraps we search for an unused ID. */ 316 for (id = 0; id < 0xffffffff; id++) { 317 smpp = srcid_lookup_id(id); 318 if (*smpp == NULL) 319 return (id); 320 } 321 panic("srcid_nextid: No free identifiers!"); 322 /* NOTREACHED */ 323 } 324 325 /* 326 * Lookup based on address. 327 * Always returns a non-null pointer. 328 * If found then *ptr will be the found object. 329 * Otherwise *ptr will be NULL and can be used to insert a new object. 330 */ 331 static srcid_map_t ** 332 srcid_lookup_addr(const in6_addr_t *addr, zoneid_t zoneid) 333 { 334 srcid_map_t **smpp; 335 336 ASSERT(RW_LOCK_HELD(&srcid_lock)); 337 smpp = &srcid_head; 338 while (*smpp != NULL) { 339 if (IN6_ARE_ADDR_EQUAL(&(*smpp)->sm_addr, addr) && 340 zoneid == (*smpp)->sm_zoneid) 341 return (smpp); 342 smpp = &(*smpp)->sm_next; 343 } 344 return (smpp); 345 } 346 347 /* 348 * Lookup based on address. 349 * Always returns a non-null pointer. 350 * If found then *ptr will be the found object. 351 * Otherwise *ptr will be NULL and can be used to insert a new object. 352 */ 353 static srcid_map_t ** 354 srcid_lookup_id(uint_t id) 355 { 356 srcid_map_t **smpp; 357 358 ASSERT(RW_LOCK_HELD(&srcid_lock)); 359 smpp = &srcid_head; 360 while (*smpp != NULL) { 361 if ((*smpp)->sm_srcid == id) 362 return (smpp); 363 smpp = &(*smpp)->sm_next; 364 } 365 return (smpp); 366 } 367