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 2009 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #include <sys/types.h> 28 #include <sys/systm.h> 29 #include <sys/stream.h> 30 #include <sys/ddi.h> 31 #include <sys/sunddi.h> 32 #include <sys/strsubr.h> 33 #include <sys/strsun.h> 34 35 #include <netinet/in.h> 36 #include <netinet/ip6.h> 37 38 #include <inet/ipsec_impl.h> 39 #include <inet/common.h> 40 #include <inet/ip.h> 41 #include <inet/ip6.h> 42 #include <inet/mib2.h> 43 #include <inet/nd.h> 44 #include <inet/optcom.h> 45 #include <inet/sctp_ip.h> 46 #include <inet/ipclassifier.h> 47 #include "sctp_impl.h" 48 49 void 50 sctp_send_shutdown(sctp_t *sctp, int rexmit) 51 { 52 mblk_t *smp; 53 mblk_t *sendmp; 54 sctp_chunk_hdr_t *sch; 55 uint32_t *ctsn; 56 sctp_faddr_t *fp; 57 sctp_stack_t *sctps = sctp->sctp_sctps; 58 59 if (sctp->sctp_state != SCTPS_ESTABLISHED && 60 sctp->sctp_state != SCTPS_SHUTDOWN_PENDING && 61 sctp->sctp_state != SCTPS_SHUTDOWN_SENT) { 62 return; 63 } 64 65 if (sctp->sctp_state == SCTPS_ESTABLISHED) { 66 sctp->sctp_state = SCTPS_SHUTDOWN_PENDING; 67 /* 68 * We set an upper bound on how long we will 69 * wait for a shutdown-ack from the peer. This 70 * is to prevent the receiver from attempting 71 * to create a half-closed state indefinately. 72 * See archive from IETF TSVWG mailing list 73 * for June 2001 for more information. 74 * Since we will not be calculating RTTs after 75 * sending the shutdown, we can overload out_time 76 * to track how long we have waited. 77 */ 78 sctp->sctp_out_time = ddi_get_lbolt64(); 79 } 80 81 /* 82 * If there is unsent (or unacked) data, wait for it to get ack'd 83 */ 84 if (sctp->sctp_xmit_head != NULL || sctp->sctp_xmit_unsent != NULL) { 85 return; 86 } 87 88 /* rotate faddrs if we are retransmitting */ 89 if (!rexmit) { 90 fp = sctp->sctp_current; 91 } else { 92 fp = sctp_rotate_faddr(sctp, sctp->sctp_shutdown_faddr); 93 } 94 95 sctp->sctp_shutdown_faddr = fp; 96 97 /* Link in a SACK if resending the shutdown */ 98 if (sctp->sctp_state > SCTPS_SHUTDOWN_PENDING && 99 (sendmp = sctp_make_sack(sctp, fp, NULL)) != NULL) { 100 101 smp = allocb(sizeof (*sch) + sizeof (*ctsn), BPRI_MED); 102 if (smp == NULL) { 103 freemsg(sendmp); 104 goto done; 105 } 106 linkb(sendmp, smp); 107 108 sch = (sctp_chunk_hdr_t *)smp->b_rptr; 109 smp->b_wptr = smp->b_rptr + sizeof (*sch) + sizeof (*ctsn); 110 } else { 111 sendmp = sctp_make_mp(sctp, fp, 112 sizeof (*sch) + sizeof (*ctsn)); 113 if (sendmp == NULL) { 114 SCTP_KSTAT(sctps, sctp_send_shutdown_failed); 115 goto done; 116 } 117 sch = (sctp_chunk_hdr_t *)sendmp->b_wptr; 118 sendmp->b_wptr += sizeof (*sch) + sizeof (*ctsn); 119 120 /* shutdown w/o sack, update lastacked */ 121 sctp->sctp_lastacked = sctp->sctp_ftsn - 1; 122 } 123 124 sch->sch_id = CHUNK_SHUTDOWN; 125 sch->sch_flags = 0; 126 sch->sch_len = htons(sizeof (*sch) + sizeof (*ctsn)); 127 128 ctsn = (uint32_t *)(sch + 1); 129 *ctsn = htonl(sctp->sctp_lastacked); 130 131 /* Link the shutdown chunk in after the IP/SCTP header */ 132 133 BUMP_LOCAL(sctp->sctp_obchunks); 134 135 /* Send the shutdown and restart the timer */ 136 sctp_set_iplen(sctp, sendmp, fp->ixa); 137 (void) conn_ip_output(sendmp, fp->ixa); 138 BUMP_LOCAL(sctp->sctp_opkts); 139 140 done: 141 sctp->sctp_state = SCTPS_SHUTDOWN_SENT; 142 SCTP_FADDR_TIMER_RESTART(sctp, sctp->sctp_current, 143 sctp->sctp_current->rto); 144 } 145 146 int 147 sctp_shutdown_received(sctp_t *sctp, sctp_chunk_hdr_t *sch, boolean_t crwsd, 148 boolean_t rexmit, sctp_faddr_t *fp) 149 { 150 mblk_t *samp; 151 sctp_chunk_hdr_t *sach; 152 uint32_t *tsn; 153 int trysend = 0; 154 sctp_stack_t *sctps = sctp->sctp_sctps; 155 156 if (sctp->sctp_state != SCTPS_SHUTDOWN_ACK_SENT) 157 sctp->sctp_state = SCTPS_SHUTDOWN_RECEIVED; 158 159 /* Extract and process the TSN in the shutdown chunk */ 160 if (sch != NULL) { 161 tsn = (uint32_t *)(sch + 1); 162 trysend = sctp_cumack(sctp, ntohl(*tsn), &samp); 163 } 164 165 /* Don't allow sending new data */ 166 if (!SCTP_IS_DETACHED(sctp) && !sctp->sctp_ulp_discon_done) { 167 sctp->sctp_ulp_opctl(sctp->sctp_ulpd, SOCK_OPCTL_SHUT_SEND, 0); 168 sctp->sctp_ulp_discon_done = B_TRUE; 169 } 170 171 /* 172 * If there is unsent or unacked data, try sending them out now. 173 * The other side should acknowledge them. After we have flushed 174 * the transmit queue, we can complete the shutdown sequence. 175 */ 176 if (sctp->sctp_xmit_head != NULL || sctp->sctp_xmit_unsent != NULL) 177 return (1); 178 179 if (fp == NULL) { 180 /* rotate faddrs if we are retransmitting */ 181 if (!rexmit) 182 fp = sctp->sctp_current; 183 else 184 fp = sctp_rotate_faddr(sctp, sctp->sctp_shutdown_faddr); 185 } 186 sctp->sctp_shutdown_faddr = fp; 187 188 samp = sctp_make_mp(sctp, fp, sizeof (*sach)); 189 if (samp == NULL) { 190 SCTP_KSTAT(sctps, sctp_send_shutdown_ack_failed); 191 goto dotimer; 192 } 193 194 sach = (sctp_chunk_hdr_t *)samp->b_wptr; 195 sach->sch_id = CHUNK_SHUTDOWN_ACK; 196 sach->sch_flags = 0; 197 sach->sch_len = htons(sizeof (*sach)); 198 199 samp->b_wptr += sizeof (*sach); 200 201 /* 202 * bundle a "cookie received while shutting down" error if 203 * the caller asks for it. 204 */ 205 if (crwsd) { 206 mblk_t *errmp; 207 208 errmp = sctp_make_err(sctp, SCTP_ERR_COOKIE_SHUT, NULL, 0); 209 if (errmp != NULL) { 210 linkb(samp, errmp); 211 BUMP_LOCAL(sctp->sctp_obchunks); 212 } 213 } 214 215 BUMP_LOCAL(sctp->sctp_obchunks); 216 217 sctp_set_iplen(sctp, samp, fp->ixa); 218 (void) conn_ip_output(samp, fp->ixa); 219 BUMP_LOCAL(sctp->sctp_opkts); 220 221 dotimer: 222 sctp->sctp_state = SCTPS_SHUTDOWN_ACK_SENT; 223 SCTP_FADDR_TIMER_RESTART(sctp, sctp->sctp_current, 224 sctp->sctp_current->rto); 225 226 return (trysend); 227 } 228 229 void 230 sctp_shutdown_complete(sctp_t *sctp) 231 { 232 mblk_t *scmp; 233 sctp_chunk_hdr_t *scch; 234 sctp_stack_t *sctps = sctp->sctp_sctps; 235 236 scmp = sctp_make_mp(sctp, sctp->sctp_current, sizeof (*scch)); 237 if (scmp == NULL) { 238 /* XXX use timer approach */ 239 SCTP_KSTAT(sctps, sctp_send_shutdown_comp_failed); 240 return; 241 } 242 243 scch = (sctp_chunk_hdr_t *)scmp->b_wptr; 244 scch->sch_id = CHUNK_SHUTDOWN_COMPLETE; 245 scch->sch_flags = 0; 246 scch->sch_len = htons(sizeof (*scch)); 247 248 scmp->b_wptr += sizeof (*scch); 249 250 BUMP_LOCAL(sctp->sctp_obchunks); 251 252 sctp_set_iplen(sctp, scmp, sctp->sctp_current->ixa); 253 (void) conn_ip_output(scmp, sctp->sctp_current->ixa); 254 BUMP_LOCAL(sctp->sctp_opkts); 255 } 256 257 /* 258 * Similar to sctp_shutdown_complete(), except that since this 259 * is out-of-the-blue, we can't use an sctp's association information, 260 * and instead must draw all necessary info from the incoming packet. 261 */ 262 void 263 sctp_ootb_shutdown_ack(mblk_t *mp, uint_t ip_hdr_len, ip_recv_attr_t *ira, 264 ip_stack_t *ipst) 265 { 266 boolean_t isv4; 267 ipha_t *ipha = NULL; 268 ip6_t *ip6h = NULL; 269 sctp_hdr_t *insctph; 270 sctp_chunk_hdr_t *scch; 271 int i; 272 uint16_t port; 273 mblk_t *mp1; 274 netstack_t *ns = ipst->ips_netstack; 275 sctp_stack_t *sctps = ns->netstack_sctp; 276 ip_xmit_attr_t ixas; 277 278 bzero(&ixas, sizeof (ixas)); 279 280 isv4 = (IPH_HDR_VERSION(mp->b_rptr) == IPV4_VERSION); 281 282 ASSERT(MBLKL(mp) >= sizeof (*insctph) + sizeof (*scch) + 283 (isv4 ? sizeof (ipha_t) : sizeof (ip6_t))); 284 285 /* 286 * Check to see if we can reuse the incoming mblk. There should 287 * not be other reference. Since this packet comes from below, 288 * there should be enough header space to fill in what the lower 289 * layers want to add. 290 */ 291 if (DB_REF(mp) != 1) { 292 mp1 = allocb(MBLKL(mp) + sctps->sctps_wroff_xtra, BPRI_MED); 293 if (mp1 == NULL) { 294 freeb(mp); 295 return; 296 } 297 mp1->b_rptr += sctps->sctps_wroff_xtra; 298 mp1->b_wptr = mp1->b_rptr + MBLKL(mp); 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 /* 309 * We follow the logic in tcp_xmit_early_reset() in that we skip 310 * reversing source route (i.e. replace all IP options with EOL). 311 */ 312 if (isv4) { 313 ipaddr_t v4addr; 314 315 ipha = (ipha_t *)mp->b_rptr; 316 for (i = IP_SIMPLE_HDR_LENGTH; i < (int)ip_hdr_len; i++) 317 mp->b_rptr[i] = IPOPT_EOL; 318 /* Swap addresses */ 319 ipha->ipha_length = htons(ixas.ixa_pktlen); 320 v4addr = ipha->ipha_src; 321 ipha->ipha_src = ipha->ipha_dst; 322 ipha->ipha_dst = v4addr; 323 ipha->ipha_ident = 0; 324 ipha->ipha_ttl = (uchar_t)sctps->sctps_ipv4_ttl; 325 326 ixas.ixa_flags = IXAF_BASIC_SIMPLE_V4; 327 } else { 328 in6_addr_t v6addr; 329 330 ip6h = (ip6_t *)mp->b_rptr; 331 /* Remove any extension headers assuming partial overlay */ 332 if (ip_hdr_len > IPV6_HDR_LEN) { 333 uint8_t *to; 334 335 to = mp->b_rptr + ip_hdr_len - IPV6_HDR_LEN; 336 ovbcopy(ip6h, to, IPV6_HDR_LEN); 337 mp->b_rptr += ip_hdr_len - IPV6_HDR_LEN; 338 ip_hdr_len = IPV6_HDR_LEN; 339 ip6h = (ip6_t *)mp->b_rptr; 340 ip6h->ip6_nxt = IPPROTO_SCTP; 341 } 342 ip6h->ip6_plen = htons(ixas.ixa_pktlen - IPV6_HDR_LEN); 343 v6addr = ip6h->ip6_src; 344 ip6h->ip6_src = ip6h->ip6_dst; 345 ip6h->ip6_dst = v6addr; 346 ip6h->ip6_hops = (uchar_t)sctps->sctps_ipv6_hoplimit; 347 348 ixas.ixa_flags = IXAF_BASIC_SIMPLE_V6; 349 if (IN6_IS_ADDR_LINKSCOPE(&ip6h->ip6_dst)) { 350 ixas.ixa_flags |= IXAF_SCOPEID_SET; 351 ixas.ixa_scopeid = ira->ira_ruifindex; 352 } 353 } 354 355 insctph = (sctp_hdr_t *)(mp->b_rptr + ip_hdr_len); 356 357 /* Swap ports. Verification tag is reused. */ 358 port = insctph->sh_sport; 359 insctph->sh_sport = insctph->sh_dport; 360 insctph->sh_dport = port; 361 362 /* Lay in the shutdown complete chunk */ 363 scch = (sctp_chunk_hdr_t *)(insctph + 1); 364 scch->sch_id = CHUNK_SHUTDOWN_COMPLETE; 365 scch->sch_len = htons(sizeof (*scch)); 366 scch->sch_flags = 0; 367 368 /* Set the T-bit */ 369 SCTP_SET_TBIT(scch); 370 371 ixas.ixa_protocol = IPPROTO_SCTP; 372 ixas.ixa_zoneid = ira->ira_zoneid; 373 ixas.ixa_ipst = ipst; 374 ixas.ixa_ifindex = 0; 375 376 if (ira->ira_flags & IRAF_IPSEC_SECURE) { 377 /* 378 * Apply IPsec based on how IPsec was applied to 379 * the packet that was out of the blue. 380 */ 381 if (!ipsec_in_to_out(ira, &ixas, mp, ipha, ip6h)) { 382 BUMP_MIB(&ipst->ips_ip_mib, ipIfStatsOutDiscards); 383 /* Note: mp already consumed and ip_drop_packet done */ 384 return; 385 } 386 } else { 387 /* 388 * This is in clear. The message we are building 389 * here should go out in clear, independent of our policy. 390 */ 391 ixas.ixa_flags |= IXAF_NO_IPSEC; 392 } 393 394 (void) ip_output_simple(mp, &ixas); 395 ixa_cleanup(&ixas); 396 } 397