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 2005 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 #include <sys/types.h> 30 #include <sys/systm.h> 31 #include <sys/stream.h> 32 #include <sys/cmn_err.h> 33 #include <sys/ddi.h> 34 #include <sys/strsubr.h> 35 36 #include <netinet/in.h> 37 #include <netinet/ip6.h> 38 39 #include <inet/common.h> 40 #include <inet/ip.h> 41 #include <inet/ip6.h> 42 #include <inet/mib2.h> 43 #include <inet/sctp_ip.h> 44 #include <inet/ipclassifier.h> 45 #include <inet/ip_ire.h> 46 #include "sctp_impl.h" 47 #include "sctp_asconf.h" 48 49 ssize_t 50 sctp_link_abort(mblk_t *mp, uint16_t serror, char *details, size_t len, 51 int iserror, boolean_t tbit) 52 { 53 size_t alen; 54 mblk_t *amp; 55 sctp_chunk_hdr_t *acp; 56 sctp_parm_hdr_t *eph; 57 58 ASSERT(mp != NULL && mp->b_cont == NULL); 59 60 alen = sizeof (*acp) + (serror != 0 ? (sizeof (*eph) + len) : 0); 61 62 amp = allocb(alen, BPRI_MED); 63 if (amp == NULL) { 64 return (-1); 65 } 66 67 amp->b_wptr = amp->b_rptr + alen; 68 69 /* Chunk header */ 70 acp = (sctp_chunk_hdr_t *)amp->b_rptr; 71 acp->sch_id = iserror ? CHUNK_ERROR : CHUNK_ABORT; 72 acp->sch_flags = 0; 73 acp->sch_len = htons(alen); 74 if (tbit) 75 SCTP_SET_TBIT(acp); 76 77 linkb(mp, amp); 78 79 if (serror == 0) { 80 return (alen); 81 } 82 83 eph = (sctp_parm_hdr_t *)(acp + 1); 84 eph->sph_type = htons(serror); 85 eph->sph_len = htons(len + sizeof (*eph)); 86 87 if (len > 0) { 88 bcopy(details, eph + 1, len); 89 } 90 91 /* XXX pad */ 92 93 return (alen); 94 } 95 96 void 97 sctp_user_abort(sctp_t *sctp, mblk_t *data, boolean_t tbit) 98 { 99 mblk_t *mp; 100 int len, hdrlen; 101 char *cause; 102 sctp_faddr_t *fp = sctp->sctp_current; 103 104 mp = sctp_make_mp(sctp, fp, 0); 105 if (mp == NULL) 106 return; 107 /* 108 * Create abort chunk. 109 */ 110 if (data) { 111 if (fp->isv4) { 112 hdrlen = sctp->sctp_hdr_len; 113 } else { 114 hdrlen = sctp->sctp_hdr6_len; 115 } 116 hdrlen += sizeof (sctp_chunk_hdr_t) + sizeof (sctp_parm_hdr_t); 117 cause = (char *)data->b_rptr; 118 len = data->b_wptr - data->b_rptr; 119 120 if (len + hdrlen > fp->sfa_pmss) { 121 len = fp->sfa_pmss - hdrlen; 122 } 123 } else { 124 cause = NULL; 125 len = 0; 126 } 127 if ((len = sctp_link_abort(mp, SCTP_ERR_USER_ABORT, cause, len, 0, 128 tbit)) < 0) { 129 freemsg(mp); 130 return; 131 } 132 sctp_set_iplen(sctp, mp); 133 BUMP_MIB(&sctp_mib, sctpAborted); 134 BUMP_LOCAL(sctp->sctp_opkts); 135 BUMP_LOCAL(sctp->sctp_obchunks); 136 137 CONN_INC_REF(sctp->sctp_connp); 138 mp->b_flag |= MSGHASREF; 139 IP_PUT(mp, sctp->sctp_connp, fp->isv4); 140 } 141 142 /* 143 * If iserror == 0, sends an abort. If iserror != 0, sends an error. 144 */ 145 void 146 sctp_send_abort(sctp_t *sctp, uint32_t vtag, uint16_t serror, char *details, 147 size_t len, mblk_t *inmp, int iserror, boolean_t tbit) 148 { 149 150 mblk_t *hmp; 151 uint32_t ip_hdr_len; 152 ipha_t *iniph; 153 ipha_t *ahiph; 154 ip6_t *inip6h; 155 ip6_t *ahip6h; 156 sctp_hdr_t *sh; 157 sctp_hdr_t *insh; 158 size_t ahlen; 159 uchar_t *p; 160 ssize_t alen; 161 int isv4; 162 ire_t *ire; 163 irb_t *irb; 164 165 isv4 = (IPH_HDR_VERSION(inmp->b_rptr) == IPV4_VERSION); 166 if (isv4) { 167 ahlen = sctp->sctp_hdr_len; 168 } else { 169 ahlen = sctp->sctp_hdr6_len; 170 } 171 172 hmp = allocb(sctp_wroff_xtra + ahlen, BPRI_MED); 173 if (hmp == NULL) { 174 /* XXX no resources */ 175 return; 176 } 177 178 /* copy in the IP / SCTP header */ 179 p = hmp->b_rptr + sctp_wroff_xtra; 180 hmp->b_rptr = p; 181 hmp->b_wptr = p + ahlen; 182 if (isv4) { 183 bcopy(sctp->sctp_iphc, p, sctp->sctp_hdr_len); 184 /* 185 * Composite is likely incomplete at this point, so pull 186 * info from the incoming IP / SCTP headers. 187 */ 188 ahiph = (ipha_t *)p; 189 iniph = (ipha_t *)inmp->b_rptr; 190 ip_hdr_len = IPH_HDR_LENGTH(inmp->b_rptr); 191 192 sh = (sctp_hdr_t *)(p + sctp->sctp_ip_hdr_len); 193 ASSERT(OK_32PTR(sh)); 194 195 insh = (sctp_hdr_t *)((uchar_t *)iniph + ip_hdr_len); 196 ASSERT(OK_32PTR(insh)); 197 198 /* Copy in the peer's IP addr */ 199 ahiph->ipha_dst = iniph->ipha_src; 200 ahiph->ipha_src = iniph->ipha_dst; 201 } else { 202 bcopy(sctp->sctp_iphc6, p, sctp->sctp_hdr6_len); 203 ahip6h = (ip6_t *)p; 204 inip6h = (ip6_t *)inmp->b_rptr; 205 ip_hdr_len = sizeof (ip6_t); 206 207 sh = (sctp_hdr_t *)(p + sctp->sctp_ip_hdr6_len); 208 ASSERT(OK_32PTR(sh)); 209 210 insh = (sctp_hdr_t *)((uchar_t *)inip6h + ip_hdr_len); 211 ASSERT(OK_32PTR(insh)); 212 213 /* Copy in the peer's IP addr */ 214 ahip6h->ip6_dst = inip6h->ip6_src; 215 ahip6h->ip6_src = inip6h->ip6_dst; 216 } 217 218 /* Fill in the holes in the SCTP common header */ 219 sh->sh_sport = insh->sh_dport; 220 sh->sh_dport = insh->sh_sport; 221 sh->sh_verf = vtag; 222 223 /* Link in the abort chunk */ 224 if ((alen = sctp_link_abort(hmp, serror, details, len, iserror, tbit)) 225 < 0) { 226 freemsg(hmp); 227 return; 228 } 229 230 if (isv4) { 231 ahiph->ipha_length = htons(ahlen + alen); 232 } else { 233 ahip6h->ip6_plen = htons(alen + sizeof (*sh)); 234 } 235 236 /* Stash the conn ptr info. for IP */ 237 SCTP_STASH_IPINFO(hmp, (ire_t *)NULL); 238 239 BUMP_MIB(&sctp_mib, sctpAborted); 240 BUMP_LOCAL(sctp->sctp_obchunks); 241 242 CONN_INC_REF(sctp->sctp_connp); 243 hmp->b_flag |= MSGHASREF; 244 IP_PUT(hmp, sctp->sctp_connp, sctp->sctp_current == NULL ? B_TRUE : 245 sctp->sctp_current->isv4); 246 /* 247 * Let's just mark the IRE for this destination as temporary 248 * to prevent any DoS attack. 249 */ 250 if (isv4) 251 ire = ire_cache_lookup(iniph->ipha_src, sctp->sctp_zoneid); 252 else 253 ire = ire_cache_lookup_v6(&inip6h->ip6_src, sctp->sctp_zoneid); 254 /* 255 * In the normal case the ire would be non-null, however it could be 256 * null, say, if IP needs to resolve the gateway for this address. We 257 * only care about IRE_CACHE. 258 */ 259 if (ire == NULL) 260 return; 261 if (ire->ire_type != IRE_CACHE) { 262 ire_refrele(ire); 263 return; 264 } 265 irb = ire->ire_bucket; 266 /* ire_lock is not needed, as ire_marks is protected by irb_lock */ 267 rw_enter(&irb->irb_lock, RW_WRITER); 268 /* 269 * Only increment the temporary IRE count if the original 270 * IRE is not already marked temporary. 271 */ 272 if (!(ire->ire_marks & IRE_MARK_TEMPORARY)) { 273 irb->irb_tmp_ire_cnt++; 274 ire->ire_marks |= IRE_MARK_TEMPORARY; 275 } 276 rw_exit(&irb->irb_lock); 277 ire_refrele(ire); 278 } 279 280 /*ARGSUSED*/ 281 mblk_t * 282 sctp_make_err(sctp_t *sctp, uint16_t serror, void *details, size_t len) 283 { 284 285 mblk_t *emp; 286 size_t elen; 287 sctp_chunk_hdr_t *ecp; 288 sctp_parm_hdr_t *eph; 289 int pad; 290 291 if ((pad = len % 4) != 0) { 292 pad = 4 - pad; 293 } 294 295 elen = sizeof (*ecp) + sizeof (*eph) + len; 296 emp = allocb(elen + pad, BPRI_MED); 297 if (emp == NULL) { 298 return (NULL); 299 } 300 301 emp->b_wptr = emp->b_rptr + elen + pad; 302 303 /* Chunk header */ 304 ecp = (sctp_chunk_hdr_t *)emp->b_rptr; 305 ecp->sch_id = CHUNK_ERROR; 306 ecp->sch_flags = 0; 307 ecp->sch_len = htons(elen); 308 309 eph = (sctp_parm_hdr_t *)(ecp + 1); 310 eph->sph_type = htons(serror); 311 eph->sph_len = htons(len + sizeof (*eph)); 312 313 if (len > 0) { 314 bcopy(details, eph + 1, len); 315 } 316 317 if (pad != 0) { 318 bzero((uchar_t *)(eph + 1) + len, pad); 319 } 320 321 return (emp); 322 } 323 324 void 325 sctp_send_err(sctp_t *sctp, mblk_t *emp, sctp_faddr_t *dest) 326 { 327 mblk_t *sendmp; 328 329 sendmp = sctp_make_sack(sctp, dest, NULL); 330 if (sendmp != NULL) { 331 linkb(sendmp, emp); 332 } else { 333 sendmp = sctp_make_mp(sctp, dest, 0); 334 if (sendmp == NULL) { 335 freemsg(emp); 336 return; 337 } 338 sendmp->b_cont = emp; 339 } 340 BUMP_LOCAL(sctp->sctp_obchunks); 341 342 sctp_set_iplen(sctp, sendmp); 343 sctp_add_sendq(sctp, sendmp); 344 } 345 346 /* 347 * Returns 0 on non-fatal error, otherwise a system error on fatal 348 * error. 349 */ 350 int 351 sctp_handle_error(sctp_t *sctp, sctp_hdr_t *sctph, sctp_chunk_hdr_t *ch, 352 mblk_t *mp) 353 { 354 sctp_parm_hdr_t *errh; 355 sctp_chunk_hdr_t *uch; 356 357 if (ch->sch_len == htons(sizeof (*ch))) { 358 /* no error cause given */ 359 return (0); 360 } 361 errh = (sctp_parm_hdr_t *)(ch + 1); 362 sctp_error_event(sctp, ch); 363 364 switch (errh->sph_type) { 365 /* 366 * Both BAD_SID and NO_USR_DATA errors 367 * indicate a serious bug in our stack, 368 * so complain and abort the association. 369 */ 370 case SCTP_ERR_BAD_SID: 371 cmn_err(CE_WARN, "BUG! send to invalid SID"); 372 sctp_send_abort(sctp, sctph->sh_verf, 0, NULL, 0, mp, 0, 0); 373 return (ECONNABORTED); 374 case SCTP_ERR_NO_USR_DATA: 375 cmn_err(CE_WARN, "BUG! no usr data"); 376 sctp_send_abort(sctp, sctph->sh_verf, 0, NULL, 0, mp, 0, 0); 377 return (ECONNABORTED); 378 case SCTP_ERR_UNREC_CHUNK: 379 /* Pull out the unrecognized chunk type */ 380 if (ntohs(errh->sph_len) < (sizeof (*errh) + sizeof (*uch))) { 381 /* Not enough to process */ 382 return (0); 383 } 384 uch = (sctp_chunk_hdr_t *)(errh + 1); 385 if (uch->sch_id == CHUNK_ASCONF) { 386 /* Turn on ASCONF sending */ 387 sctp->sctp_understands_asconf = B_FALSE; 388 /* 389 * Hand off to asconf to clear out the unacked 390 * asconf chunk. 391 */ 392 if (ntohs(uch->sch_len) != 393 (ntohs(errh->sph_len) - sizeof (*errh))) { 394 /* malformed */ 395 dprint(0, ("Malformed Unrec Chunk error\n")); 396 return (0); 397 } 398 sctp_asconf_free_cxmit(sctp, uch); 399 return (0); 400 } 401 /* Else drop it */ 402 break; 403 default: 404 break; 405 } 406 407 return (0); 408 } 409