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 <net/pfkeyv2.h> 105 #include <inet/ipsec_info.h> 106 #include <inet/sadb.h> 107 #include <sys/kmem.h> 108 #include <inet/ipsec_impl.h> 109 110 static uint_t srcid_nextid(ip_stack_t *); 111 static srcid_map_t **srcid_lookup_addr(const in6_addr_t *addr, 112 zoneid_t zoneid, ip_stack_t *); 113 static srcid_map_t **srcid_lookup_id(uint_t id, ip_stack_t *); 114 115 116 /* 117 * Insert/add a new address to the map. 118 * Returns zero if ok; otherwise errno (e.g. for memory allocation failure). 119 */ 120 int 121 ip_srcid_insert(const in6_addr_t *addr, zoneid_t zoneid, ip_stack_t *ipst) 122 { 123 srcid_map_t **smpp; 124 #ifdef DEBUG 125 char abuf[INET6_ADDRSTRLEN]; 126 127 ip1dbg(("ip_srcid_insert(%s, %d)\n", 128 inet_ntop(AF_INET6, addr, abuf, sizeof (abuf)), zoneid)); 129 #endif 130 131 rw_enter(&ipst->ips_srcid_lock, RW_WRITER); 132 smpp = srcid_lookup_addr(addr, zoneid, ipst); 133 if (*smpp != NULL) { 134 /* Already present - increment refcount */ 135 (*smpp)->sm_refcnt++; 136 ASSERT((*smpp)->sm_refcnt != 0); /* wraparound */ 137 rw_exit(&ipst->ips_srcid_lock); 138 return (0); 139 } 140 /* Insert new */ 141 *smpp = kmem_alloc(sizeof (srcid_map_t), KM_NOSLEEP); 142 if (*smpp == NULL) { 143 rw_exit(&ipst->ips_srcid_lock); 144 return (ENOMEM); 145 } 146 (*smpp)->sm_next = NULL; 147 (*smpp)->sm_addr = *addr; 148 (*smpp)->sm_srcid = srcid_nextid(ipst); 149 (*smpp)->sm_refcnt = 1; 150 (*smpp)->sm_zoneid = zoneid; 151 152 rw_exit(&ipst->ips_srcid_lock); 153 return (0); 154 } 155 156 /* 157 * Remove an new address from the map. 158 * Returns zero if ok; otherwise errno (e.g. for nonexistent address). 159 */ 160 int 161 ip_srcid_remove(const in6_addr_t *addr, zoneid_t zoneid, ip_stack_t *ipst) 162 { 163 srcid_map_t **smpp; 164 srcid_map_t *smp; 165 #ifdef DEBUG 166 char abuf[INET6_ADDRSTRLEN]; 167 168 ip1dbg(("ip_srcid_remove(%s, %d)\n", 169 inet_ntop(AF_INET6, addr, abuf, sizeof (abuf)), zoneid)); 170 #endif 171 172 rw_enter(&ipst->ips_srcid_lock, RW_WRITER); 173 smpp = srcid_lookup_addr(addr, zoneid, ipst); 174 smp = *smpp; 175 if (smp == NULL) { 176 /* Not preset */ 177 rw_exit(&ipst->ips_srcid_lock); 178 return (ENOENT); 179 } 180 181 /* Decrement refcount */ 182 ASSERT(smp->sm_refcnt != 0); 183 smp->sm_refcnt--; 184 if (smp->sm_refcnt != 0) { 185 rw_exit(&ipst->ips_srcid_lock); 186 return (0); 187 } 188 /* Remove entry */ 189 *smpp = smp->sm_next; 190 rw_exit(&ipst->ips_srcid_lock); 191 smp->sm_next = NULL; 192 kmem_free(smp, sizeof (srcid_map_t)); 193 return (0); 194 } 195 196 /* 197 * Map from an address to a source id. 198 * If the address is unknown return the unknown id (zero). 199 */ 200 uint_t 201 ip_srcid_find_addr(const in6_addr_t *addr, zoneid_t zoneid, 202 netstack_t *ns) 203 { 204 srcid_map_t **smpp; 205 srcid_map_t *smp; 206 uint_t id; 207 ip_stack_t *ipst = ns->netstack_ip; 208 209 rw_enter(&ipst->ips_srcid_lock, RW_READER); 210 smpp = srcid_lookup_addr(addr, zoneid, ipst); 211 smp = *smpp; 212 if (smp == NULL) { 213 char abuf[INET6_ADDRSTRLEN]; 214 215 /* Not present - could be broadcast or multicast address */ 216 ip1dbg(("ip_srcid_find_addr: unknown %s in zone %d\n", 217 inet_ntop(AF_INET6, addr, abuf, sizeof (abuf)), zoneid)); 218 id = 0; 219 } else { 220 ASSERT(smp->sm_refcnt != 0); 221 id = smp->sm_srcid; 222 } 223 rw_exit(&ipst->ips_srcid_lock); 224 return (id); 225 } 226 227 /* 228 * Map from a source id to an address. 229 * If the id is unknown return the unspecified address. 230 */ 231 void 232 ip_srcid_find_id(uint_t id, in6_addr_t *addr, zoneid_t zoneid, 233 netstack_t *ns) 234 { 235 srcid_map_t **smpp; 236 srcid_map_t *smp; 237 ip_stack_t *ipst = ns->netstack_ip; 238 239 rw_enter(&ipst->ips_srcid_lock, RW_READER); 240 smpp = srcid_lookup_id(id, ipst); 241 smp = *smpp; 242 if (smp == NULL || smp->sm_zoneid != zoneid) { 243 /* Not preset */ 244 ip1dbg(("ip_srcid_find_id: unknown %u or in wrong zone\n", id)); 245 *addr = ipv6_all_zeros; 246 } else { 247 ASSERT(smp->sm_refcnt != 0); 248 *addr = smp->sm_addr; 249 } 250 rw_exit(&ipst->ips_srcid_lock); 251 } 252 253 /* Assign the next available ID */ 254 static uint_t 255 srcid_nextid(ip_stack_t *ipst) 256 { 257 uint_t id; 258 srcid_map_t **smpp; 259 260 ASSERT(rw_owner(&ipst->ips_srcid_lock) == curthread); 261 262 if (!ipst->ips_srcid_wrapped) { 263 id = ipst->ips_ip_src_id++; 264 if (ipst->ips_ip_src_id == 0) 265 ipst->ips_srcid_wrapped = B_TRUE; 266 return (id); 267 } 268 /* Once it wraps we search for an unused ID. */ 269 for (id = 0; id < 0xffffffff; id++) { 270 smpp = srcid_lookup_id(id, ipst); 271 if (*smpp == NULL) 272 return (id); 273 } 274 panic("srcid_nextid: No free identifiers!"); 275 /* NOTREACHED */ 276 } 277 278 /* 279 * Lookup based on address. 280 * Always returns a non-null pointer. 281 * If found then *ptr will be the found object. 282 * Otherwise *ptr will be NULL and can be used to insert a new object. 283 */ 284 static srcid_map_t ** 285 srcid_lookup_addr(const in6_addr_t *addr, zoneid_t zoneid, ip_stack_t *ipst) 286 { 287 srcid_map_t **smpp; 288 289 ASSERT(RW_LOCK_HELD(&ipst->ips_srcid_lock)); 290 smpp = &ipst->ips_srcid_head; 291 while (*smpp != NULL) { 292 if (IN6_ARE_ADDR_EQUAL(&(*smpp)->sm_addr, addr) && 293 zoneid == (*smpp)->sm_zoneid) 294 return (smpp); 295 smpp = &(*smpp)->sm_next; 296 } 297 return (smpp); 298 } 299 300 /* 301 * Lookup based on address. 302 * Always returns a non-null pointer. 303 * If found then *ptr will be the found object. 304 * Otherwise *ptr will be NULL and can be used to insert a new object. 305 */ 306 static srcid_map_t ** 307 srcid_lookup_id(uint_t id, ip_stack_t *ipst) 308 { 309 srcid_map_t **smpp; 310 311 ASSERT(RW_LOCK_HELD(&ipst->ips_srcid_lock)); 312 smpp = &ipst->ips_srcid_head; 313 while (*smpp != NULL) { 314 if ((*smpp)->sm_srcid == id) 315 return (smpp); 316 smpp = &(*smpp)->sm_next; 317 } 318 return (smpp); 319 } 320