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 (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright 2009 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 /* 27 * This is used to support the hidden __sin6_src_id in the sockaddr_in6 28 * structure which is there to ensure that applications (such as UDP apps) 29 * which get an address from recvfrom and use that address in a sendto 30 * or connect will by default use the same source address in the "response" 31 * as the destination address in the "request" they received. 32 * 33 * This is built using some new functions (in IP - doing their own locking 34 * so they can be called from the transports) to map between integer IDs 35 * and in6_addr_t. 36 * The use applies to sockaddr_in6 - whether or not mapped addresses are used. 37 * 38 * This file contains the functions used by both IP and the transports 39 * to implement __sin6_src_id. 40 * The routines do their own locking since they are called from 41 * the transports (to map between a source id and an address) 42 * and from IP proper when IP addresses are added and removed. 43 * 44 * The routines handle both IPv4 and IPv6 with the IPv4 addresses represented 45 * as IPv4-mapped addresses. 46 */ 47 48 #include <sys/types.h> 49 #include <sys/stream.h> 50 #include <sys/dlpi.h> 51 #include <sys/stropts.h> 52 #include <sys/sysmacros.h> 53 #include <sys/strsubr.h> 54 #include <sys/strlog.h> 55 #define _SUN_TPI_VERSION 2 56 #include <sys/tihdr.h> 57 #include <sys/xti_inet.h> 58 #include <sys/ddi.h> 59 #include <sys/cmn_err.h> 60 #include <sys/debug.h> 61 #include <sys/modctl.h> 62 #include <sys/atomic.h> 63 #include <sys/zone.h> 64 65 #include <sys/systm.h> 66 #include <sys/param.h> 67 #include <sys/kmem.h> 68 #include <sys/callb.h> 69 #include <sys/socket.h> 70 #include <sys/vtrace.h> 71 #include <sys/isa_defs.h> 72 #include <sys/kmem.h> 73 #include <net/if.h> 74 #include <net/if_arp.h> 75 #include <net/route.h> 76 #include <sys/sockio.h> 77 #include <netinet/in.h> 78 #include <net/if_dl.h> 79 80 #include <inet/common.h> 81 #include <inet/mi.h> 82 #include <inet/mib2.h> 83 #include <inet/nd.h> 84 #include <inet/arp.h> 85 #include <inet/snmpcom.h> 86 87 #include <netinet/igmp_var.h> 88 #include <netinet/ip6.h> 89 #include <netinet/icmp6.h> 90 91 #include <inet/ip.h> 92 #include <inet/ip6.h> 93 #include <inet/tcp.h> 94 #include <inet/ip_multi.h> 95 #include <inet/ip_if.h> 96 #include <inet/ip_ire.h> 97 #include <inet/ip_rts.h> 98 #include <inet/optcom.h> 99 #include <inet/ip_ndp.h> 100 #include <netinet/igmp.h> 101 #include <netinet/ip_mroute.h> 102 #include <inet/ipclassifier.h> 103 104 #include <sys/kmem.h> 105 106 static uint_t srcid_nextid(ip_stack_t *); 107 static srcid_map_t **srcid_lookup_addr(const in6_addr_t *addr, 108 zoneid_t zoneid, ip_stack_t *); 109 static srcid_map_t **srcid_lookup_id(uint_t id, ip_stack_t *); 110 111 112 /* 113 * Insert/add a new address to the map. 114 * Returns zero if ok; otherwise errno (e.g. for memory allocation failure). 115 */ 116 int 117 ip_srcid_insert(const in6_addr_t *addr, zoneid_t zoneid, ip_stack_t *ipst) 118 { 119 srcid_map_t **smpp; 120 #ifdef DEBUG 121 char abuf[INET6_ADDRSTRLEN]; 122 123 ip1dbg(("ip_srcid_insert(%s, %d)\n", 124 inet_ntop(AF_INET6, addr, abuf, sizeof (abuf)), zoneid)); 125 #endif 126 127 rw_enter(&ipst->ips_srcid_lock, RW_WRITER); 128 smpp = srcid_lookup_addr(addr, zoneid, ipst); 129 if (*smpp != NULL) { 130 /* Already present - increment refcount */ 131 (*smpp)->sm_refcnt++; 132 ASSERT((*smpp)->sm_refcnt != 0); /* wraparound */ 133 rw_exit(&ipst->ips_srcid_lock); 134 return (0); 135 } 136 /* Insert new */ 137 *smpp = kmem_alloc(sizeof (srcid_map_t), KM_NOSLEEP); 138 if (*smpp == NULL) { 139 rw_exit(&ipst->ips_srcid_lock); 140 return (ENOMEM); 141 } 142 (*smpp)->sm_next = NULL; 143 (*smpp)->sm_addr = *addr; 144 (*smpp)->sm_srcid = srcid_nextid(ipst); 145 (*smpp)->sm_refcnt = 1; 146 (*smpp)->sm_zoneid = zoneid; 147 148 rw_exit(&ipst->ips_srcid_lock); 149 return (0); 150 } 151 152 /* 153 * Remove an new address from the map. 154 * Returns zero if ok; otherwise errno (e.g. for nonexistent address). 155 */ 156 int 157 ip_srcid_remove(const in6_addr_t *addr, zoneid_t zoneid, ip_stack_t *ipst) 158 { 159 srcid_map_t **smpp; 160 srcid_map_t *smp; 161 #ifdef DEBUG 162 char abuf[INET6_ADDRSTRLEN]; 163 164 ip1dbg(("ip_srcid_remove(%s, %d)\n", 165 inet_ntop(AF_INET6, addr, abuf, sizeof (abuf)), zoneid)); 166 #endif 167 168 rw_enter(&ipst->ips_srcid_lock, RW_WRITER); 169 smpp = srcid_lookup_addr(addr, zoneid, ipst); 170 smp = *smpp; 171 if (smp == NULL) { 172 /* Not preset */ 173 rw_exit(&ipst->ips_srcid_lock); 174 return (ENOENT); 175 } 176 177 /* Decrement refcount */ 178 ASSERT(smp->sm_refcnt != 0); 179 smp->sm_refcnt--; 180 if (smp->sm_refcnt != 0) { 181 rw_exit(&ipst->ips_srcid_lock); 182 return (0); 183 } 184 /* Remove entry */ 185 *smpp = smp->sm_next; 186 rw_exit(&ipst->ips_srcid_lock); 187 smp->sm_next = NULL; 188 kmem_free(smp, sizeof (srcid_map_t)); 189 return (0); 190 } 191 192 /* 193 * Map from an address to a source id. 194 * If the address is unknown return the unknown id (zero). 195 */ 196 uint_t 197 ip_srcid_find_addr(const in6_addr_t *addr, zoneid_t zoneid, 198 netstack_t *ns) 199 { 200 srcid_map_t **smpp; 201 srcid_map_t *smp; 202 uint_t id; 203 ip_stack_t *ipst = ns->netstack_ip; 204 205 rw_enter(&ipst->ips_srcid_lock, RW_READER); 206 smpp = srcid_lookup_addr(addr, zoneid, ipst); 207 smp = *smpp; 208 if (smp == NULL) { 209 char abuf[INET6_ADDRSTRLEN]; 210 211 /* Not present - could be broadcast or multicast address */ 212 ip1dbg(("ip_srcid_find_addr: unknown %s in zone %d\n", 213 inet_ntop(AF_INET6, addr, abuf, sizeof (abuf)), zoneid)); 214 id = 0; 215 } else { 216 ASSERT(smp->sm_refcnt != 0); 217 id = smp->sm_srcid; 218 } 219 rw_exit(&ipst->ips_srcid_lock); 220 return (id); 221 } 222 223 /* 224 * Map from a source id to an address. 225 * If the id is unknown return the unspecified address. 226 */ 227 void 228 ip_srcid_find_id(uint_t id, in6_addr_t *addr, zoneid_t zoneid, 229 netstack_t *ns) 230 { 231 srcid_map_t **smpp; 232 srcid_map_t *smp; 233 ip_stack_t *ipst = ns->netstack_ip; 234 235 rw_enter(&ipst->ips_srcid_lock, RW_READER); 236 smpp = srcid_lookup_id(id, ipst); 237 smp = *smpp; 238 if (smp == NULL || (smp->sm_zoneid != zoneid && zoneid != ALL_ZONES)) { 239 /* Not preset */ 240 ip1dbg(("ip_srcid_find_id: unknown %u or in wrong zone\n", id)); 241 *addr = ipv6_all_zeros; 242 } else { 243 ASSERT(smp->sm_refcnt != 0); 244 *addr = smp->sm_addr; 245 } 246 rw_exit(&ipst->ips_srcid_lock); 247 } 248 249 /* Assign the next available ID */ 250 static uint_t 251 srcid_nextid(ip_stack_t *ipst) 252 { 253 uint_t id; 254 srcid_map_t **smpp; 255 256 ASSERT(rw_owner(&ipst->ips_srcid_lock) == curthread); 257 258 if (!ipst->ips_srcid_wrapped) { 259 id = ipst->ips_ip_src_id++; 260 if (ipst->ips_ip_src_id == 0) 261 ipst->ips_srcid_wrapped = B_TRUE; 262 return (id); 263 } 264 /* Once it wraps we search for an unused ID. */ 265 for (id = 0; id < 0xffffffff; id++) { 266 smpp = srcid_lookup_id(id, ipst); 267 if (*smpp == NULL) 268 return (id); 269 } 270 panic("srcid_nextid: No free identifiers!"); 271 /* NOTREACHED */ 272 } 273 274 /* 275 * Lookup based on address. 276 * Always returns a non-null pointer. 277 * If found then *ptr will be the found object. 278 * Otherwise *ptr will be NULL and can be used to insert a new object. 279 */ 280 static srcid_map_t ** 281 srcid_lookup_addr(const in6_addr_t *addr, zoneid_t zoneid, ip_stack_t *ipst) 282 { 283 srcid_map_t **smpp; 284 285 ASSERT(RW_LOCK_HELD(&ipst->ips_srcid_lock)); 286 smpp = &ipst->ips_srcid_head; 287 while (*smpp != NULL) { 288 if (IN6_ARE_ADDR_EQUAL(&(*smpp)->sm_addr, addr) && 289 (zoneid == (*smpp)->sm_zoneid || zoneid == ALL_ZONES)) 290 return (smpp); 291 smpp = &(*smpp)->sm_next; 292 } 293 return (smpp); 294 } 295 296 /* 297 * Lookup based on address. 298 * Always returns a non-null pointer. 299 * If found then *ptr will be the found object. 300 * Otherwise *ptr will be NULL and can be used to insert a new object. 301 */ 302 static srcid_map_t ** 303 srcid_lookup_id(uint_t id, ip_stack_t *ipst) 304 { 305 srcid_map_t **smpp; 306 307 ASSERT(RW_LOCK_HELD(&ipst->ips_srcid_lock)); 308 smpp = &ipst->ips_srcid_head; 309 while (*smpp != NULL) { 310 if ((*smpp)->sm_srcid == id) 311 return (smpp); 312 smpp = &(*smpp)->sm_next; 313 } 314 return (smpp); 315 } 316