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 /* 23 * Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved. 24 */ 25 26 #include <sys/types.h> 27 #include <sys/systm.h> 28 #include <sys/stream.h> 29 #include <sys/ddi.h> 30 #include <sys/sunddi.h> 31 #include <sys/strsubr.h> 32 #include <sys/strsun.h> 33 34 #include <netinet/in.h> 35 #include <netinet/ip6.h> 36 37 #include <inet/ipsec_impl.h> 38 #include <inet/common.h> 39 #include <inet/ip.h> 40 #include <inet/ip6.h> 41 #include <inet/mib2.h> 42 #include <inet/nd.h> 43 #include <inet/optcom.h> 44 #include <inet/sctp_ip.h> 45 #include <inet/ipclassifier.h> 46 #include "sctp_impl.h" 47 48 void 49 sctp_send_shutdown(sctp_t *sctp, int rexmit) 50 { 51 mblk_t *smp; 52 mblk_t *sendmp; 53 sctp_chunk_hdr_t *sch; 54 uint32_t *ctsn; 55 sctp_faddr_t *fp; 56 sctp_stack_t *sctps = sctp->sctp_sctps; 57 58 if (sctp->sctp_state != SCTPS_ESTABLISHED && 59 sctp->sctp_state != SCTPS_SHUTDOWN_PENDING && 60 sctp->sctp_state != SCTPS_SHUTDOWN_SENT) { 61 return; 62 } 63 64 if (sctp->sctp_state == SCTPS_ESTABLISHED) { 65 sctp->sctp_state = SCTPS_SHUTDOWN_PENDING; 66 /* 67 * We set an upper bound on how long we will 68 * wait for a shutdown-ack from the peer. This 69 * is to prevent the receiver from attempting 70 * to create a half-closed state indefinately. 71 * See archive from IETF TSVWG mailing list 72 * for June 2001 for more information. 73 * Since we will not be calculating RTTs after 74 * sending the shutdown, we can overload out_time 75 * to track how long we have waited. 76 */ 77 sctp->sctp_out_time = ddi_get_lbolt64(); 78 } 79 80 /* 81 * If there is unsent (or unacked) data, wait for it to get ack'd 82 */ 83 if (sctp->sctp_xmit_head != NULL || sctp->sctp_xmit_unsent != NULL) { 84 return; 85 } 86 87 /* rotate faddrs if we are retransmitting */ 88 if (!rexmit) { 89 fp = sctp->sctp_current; 90 } else { 91 fp = sctp_rotate_faddr(sctp, sctp->sctp_shutdown_faddr); 92 } 93 94 sctp->sctp_shutdown_faddr = fp; 95 96 /* Link in a SACK if resending the shutdown */ 97 if (sctp->sctp_state > SCTPS_SHUTDOWN_PENDING && 98 (sendmp = sctp_make_sack(sctp, fp, NULL)) != NULL) { 99 100 smp = allocb(sizeof (*sch) + sizeof (*ctsn), BPRI_MED); 101 if (smp == NULL) { 102 freemsg(sendmp); 103 goto done; 104 } 105 linkb(sendmp, smp); 106 107 sch = (sctp_chunk_hdr_t *)smp->b_rptr; 108 smp->b_wptr = smp->b_rptr + sizeof (*sch) + sizeof (*ctsn); 109 } else { 110 sendmp = sctp_make_mp(sctp, fp, 111 sizeof (*sch) + sizeof (*ctsn)); 112 if (sendmp == NULL) { 113 SCTP_KSTAT(sctps, sctp_send_shutdown_failed); 114 goto done; 115 } 116 sch = (sctp_chunk_hdr_t *)sendmp->b_wptr; 117 sendmp->b_wptr += sizeof (*sch) + sizeof (*ctsn); 118 119 /* shutdown w/o sack, update lastacked */ 120 sctp->sctp_lastacked = sctp->sctp_ftsn - 1; 121 } 122 123 sch->sch_id = CHUNK_SHUTDOWN; 124 sch->sch_flags = 0; 125 sch->sch_len = htons(sizeof (*sch) + sizeof (*ctsn)); 126 127 ctsn = (uint32_t *)(sch + 1); 128 *ctsn = htonl(sctp->sctp_lastacked); 129 130 /* Link the shutdown chunk in after the IP/SCTP header */ 131 132 BUMP_LOCAL(sctp->sctp_obchunks); 133 134 /* Send the shutdown and restart the timer */ 135 sctp_set_iplen(sctp, sendmp, fp->ixa); 136 (void) conn_ip_output(sendmp, fp->ixa); 137 BUMP_LOCAL(sctp->sctp_opkts); 138 139 done: 140 sctp->sctp_state = SCTPS_SHUTDOWN_SENT; 141 SCTP_FADDR_TIMER_RESTART(sctp, sctp->sctp_current, 142 sctp->sctp_current->rto); 143 } 144 145 int 146 sctp_shutdown_received(sctp_t *sctp, sctp_chunk_hdr_t *sch, boolean_t crwsd, 147 boolean_t rexmit, sctp_faddr_t *fp) 148 { 149 mblk_t *samp; 150 sctp_chunk_hdr_t *sach; 151 uint32_t *tsn; 152 int trysend = 0; 153 sctp_stack_t *sctps = sctp->sctp_sctps; 154 155 if (sctp->sctp_state != SCTPS_SHUTDOWN_ACK_SENT) 156 sctp->sctp_state = SCTPS_SHUTDOWN_RECEIVED; 157 158 /* Extract and process the TSN in the shutdown chunk */ 159 if (sch != NULL) { 160 tsn = (uint32_t *)(sch + 1); 161 /* not already acked */ 162 if (!SEQ_LT(ntohl(*tsn), sctp->sctp_lastack_rxd)) 163 trysend = sctp_cumack(sctp, ntohl(*tsn), &samp); 164 } 165 166 /* Don't allow sending new data */ 167 if (!SCTP_IS_DETACHED(sctp) && !sctp->sctp_ulp_discon_done) { 168 sctp->sctp_ulp_opctl(sctp->sctp_ulpd, SOCK_OPCTL_SHUT_SEND, 0); 169 sctp->sctp_ulp_discon_done = B_TRUE; 170 } 171 172 /* 173 * If there is unsent or unacked data, try sending them out now. 174 * The other side should acknowledge them. After we have flushed 175 * the transmit queue, we can complete the shutdown sequence. 176 */ 177 if (sctp->sctp_xmit_head != NULL || sctp->sctp_xmit_unsent != NULL) 178 return (1); 179 180 if (fp == NULL) { 181 /* rotate faddrs if we are retransmitting */ 182 if (!rexmit) 183 fp = sctp->sctp_current; 184 else 185 fp = sctp_rotate_faddr(sctp, sctp->sctp_shutdown_faddr); 186 } 187 sctp->sctp_shutdown_faddr = fp; 188 189 samp = sctp_make_mp(sctp, fp, sizeof (*sach)); 190 if (samp == NULL) { 191 SCTP_KSTAT(sctps, sctp_send_shutdown_ack_failed); 192 goto dotimer; 193 } 194 195 sach = (sctp_chunk_hdr_t *)samp->b_wptr; 196 sach->sch_id = CHUNK_SHUTDOWN_ACK; 197 sach->sch_flags = 0; 198 sach->sch_len = htons(sizeof (*sach)); 199 200 samp->b_wptr += sizeof (*sach); 201 202 /* 203 * bundle a "cookie received while shutting down" error if 204 * the caller asks for it. 205 */ 206 if (crwsd) { 207 mblk_t *errmp; 208 209 errmp = sctp_make_err(sctp, SCTP_ERR_COOKIE_SHUT, NULL, 0); 210 if (errmp != NULL) { 211 linkb(samp, errmp); 212 BUMP_LOCAL(sctp->sctp_obchunks); 213 } 214 } 215 216 BUMP_LOCAL(sctp->sctp_obchunks); 217 218 sctp_set_iplen(sctp, samp, fp->ixa); 219 (void) conn_ip_output(samp, fp->ixa); 220 BUMP_LOCAL(sctp->sctp_opkts); 221 222 dotimer: 223 sctp->sctp_state = SCTPS_SHUTDOWN_ACK_SENT; 224 SCTP_FADDR_TIMER_RESTART(sctp, sctp->sctp_current, 225 sctp->sctp_current->rto); 226 227 return (trysend); 228 } 229 230 void 231 sctp_shutdown_complete(sctp_t *sctp) 232 { 233 mblk_t *scmp; 234 sctp_chunk_hdr_t *scch; 235 sctp_stack_t *sctps = sctp->sctp_sctps; 236 237 scmp = sctp_make_mp(sctp, sctp->sctp_current, sizeof (*scch)); 238 if (scmp == NULL) { 239 /* XXX use timer approach */ 240 SCTP_KSTAT(sctps, sctp_send_shutdown_comp_failed); 241 return; 242 } 243 244 scch = (sctp_chunk_hdr_t *)scmp->b_wptr; 245 scch->sch_id = CHUNK_SHUTDOWN_COMPLETE; 246 scch->sch_flags = 0; 247 scch->sch_len = htons(sizeof (*scch)); 248 249 scmp->b_wptr += sizeof (*scch); 250 251 BUMP_LOCAL(sctp->sctp_obchunks); 252 253 sctp_set_iplen(sctp, scmp, sctp->sctp_current->ixa); 254 (void) conn_ip_output(scmp, sctp->sctp_current->ixa); 255 BUMP_LOCAL(sctp->sctp_opkts); 256 } 257 258 /* 259 * Similar to sctp_shutdown_complete(), except that since this 260 * is out-of-the-blue, we can't use an sctp's association information, 261 * and instead must draw all necessary info from the incoming packet. 262 */ 263 void 264 sctp_ootb_shutdown_ack(mblk_t *mp, uint_t ip_hdr_len, ip_recv_attr_t *ira, 265 ip_stack_t *ipst) 266 { 267 boolean_t isv4; 268 ipha_t *ipha = NULL; 269 ip6_t *ip6h = NULL; 270 sctp_hdr_t *insctph; 271 sctp_chunk_hdr_t *scch; 272 int i; 273 uint16_t port; 274 mblk_t *mp1; 275 netstack_t *ns = ipst->ips_netstack; 276 sctp_stack_t *sctps = ns->netstack_sctp; 277 ip_xmit_attr_t ixas; 278 279 bzero(&ixas, sizeof (ixas)); 280 281 isv4 = (IPH_HDR_VERSION(mp->b_rptr) == IPV4_VERSION); 282 283 ASSERT(MBLKL(mp) >= sizeof (*insctph) + sizeof (*scch) + 284 (isv4 ? sizeof (ipha_t) : sizeof (ip6_t))); 285 286 /* 287 * Check to see if we can reuse the incoming mblk. There should 288 * not be other reference. Since this packet comes from below, 289 * there should be enough header space to fill in what the lower 290 * layers want to add. 291 */ 292 if (DB_REF(mp) != 1) { 293 mp1 = allocb(MBLKL(mp) + sctps->sctps_wroff_xtra, BPRI_MED); 294 if (mp1 == NULL) { 295 freeb(mp); 296 return; 297 } 298 mp1->b_rptr += sctps->sctps_wroff_xtra; 299 bcopy(mp->b_rptr, mp1->b_rptr, MBLKL(mp)); 300 freeb(mp); 301 mp = mp1; 302 } else { 303 DB_CKSUMFLAGS(mp) = 0; 304 } 305 306 ixas.ixa_pktlen = ip_hdr_len + sizeof (*insctph) + sizeof (*scch); 307 ixas.ixa_ip_hdr_length = ip_hdr_len; 308 mp->b_wptr = (mp->b_rptr + ixas.ixa_pktlen); 309 310 /* 311 * We follow the logic in tcp_xmit_early_reset() in that we skip 312 * reversing source route (i.e. replace all IP options with EOL). 313 */ 314 if (isv4) { 315 ipaddr_t v4addr; 316 317 ipha = (ipha_t *)mp->b_rptr; 318 for (i = IP_SIMPLE_HDR_LENGTH; i < (int)ip_hdr_len; i++) 319 mp->b_rptr[i] = IPOPT_EOL; 320 /* Swap addresses */ 321 ipha->ipha_length = htons(ixas.ixa_pktlen); 322 v4addr = ipha->ipha_src; 323 ipha->ipha_src = ipha->ipha_dst; 324 ipha->ipha_dst = v4addr; 325 ipha->ipha_ident = 0; 326 ipha->ipha_ttl = (uchar_t)sctps->sctps_ipv4_ttl; 327 328 ixas.ixa_flags = IXAF_BASIC_SIMPLE_V4; 329 } else { 330 in6_addr_t v6addr; 331 332 ip6h = (ip6_t *)mp->b_rptr; 333 /* Remove any extension headers assuming partial overlay */ 334 if (ip_hdr_len > IPV6_HDR_LEN) { 335 uint8_t *to; 336 337 to = mp->b_rptr + ip_hdr_len - IPV6_HDR_LEN; 338 ovbcopy(ip6h, to, IPV6_HDR_LEN); 339 mp->b_rptr += ip_hdr_len - IPV6_HDR_LEN; 340 ip_hdr_len = IPV6_HDR_LEN; 341 ip6h = (ip6_t *)mp->b_rptr; 342 ip6h->ip6_nxt = IPPROTO_SCTP; 343 } 344 ip6h->ip6_plen = htons(ixas.ixa_pktlen - IPV6_HDR_LEN); 345 v6addr = ip6h->ip6_src; 346 ip6h->ip6_src = ip6h->ip6_dst; 347 ip6h->ip6_dst = v6addr; 348 ip6h->ip6_hops = (uchar_t)sctps->sctps_ipv6_hoplimit; 349 350 ixas.ixa_flags = IXAF_BASIC_SIMPLE_V6; 351 if (IN6_IS_ADDR_LINKSCOPE(&ip6h->ip6_dst)) { 352 ixas.ixa_flags |= IXAF_SCOPEID_SET; 353 ixas.ixa_scopeid = ira->ira_ruifindex; 354 } 355 } 356 357 insctph = (sctp_hdr_t *)(mp->b_rptr + ip_hdr_len); 358 359 /* Swap ports. Verification tag is reused. */ 360 port = insctph->sh_sport; 361 insctph->sh_sport = insctph->sh_dport; 362 insctph->sh_dport = port; 363 364 /* Lay in the shutdown complete chunk */ 365 scch = (sctp_chunk_hdr_t *)(insctph + 1); 366 scch->sch_id = CHUNK_SHUTDOWN_COMPLETE; 367 scch->sch_len = htons(sizeof (*scch)); 368 scch->sch_flags = 0; 369 370 /* Set the T-bit */ 371 SCTP_SET_TBIT(scch); 372 373 ixas.ixa_protocol = IPPROTO_SCTP; 374 ixas.ixa_zoneid = ira->ira_zoneid; 375 ixas.ixa_ipst = ipst; 376 ixas.ixa_ifindex = 0; 377 378 if (ira->ira_flags & IRAF_IPSEC_SECURE) { 379 /* 380 * Apply IPsec based on how IPsec was applied to 381 * the packet that was out of the blue. 382 */ 383 if (!ipsec_in_to_out(ira, &ixas, mp, ipha, ip6h)) { 384 BUMP_MIB(&ipst->ips_ip_mib, ipIfStatsOutDiscards); 385 /* Note: mp already consumed and ip_drop_packet done */ 386 return; 387 } 388 } else { 389 /* 390 * This is in clear. The message we are building 391 * here should go out in clear, independent of our policy. 392 */ 393 ixas.ixa_flags |= IXAF_NO_IPSEC; 394 } 395 396 (void) ip_output_simple(mp, &ixas); 397 ixa_cleanup(&ixas); 398 } 399