1 /*- 2 * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved. 3 * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved. 4 * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions are met: 8 * 9 * a) Redistributions of source code must retain the above copyright notice, 10 * this list of conditions and the following disclaimer. 11 * 12 * b) Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in 14 * the documentation and/or other materials provided with the distribution. 15 * 16 * c) Neither the name of Cisco Systems, Inc. nor the names of its 17 * contributors may be used to endorse or promote products derived 18 * from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 22 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 24 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 30 * THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #ifdef __FreeBSD__ 34 #include <sys/cdefs.h> 35 __FBSDID("$FreeBSD: head/sys/netinet/sctp_peeloff.c 243565 2012-11-26 16:44:03Z tuexen $"); 36 #endif 37 38 #include <netinet/sctp_os.h> 39 #include <netinet/sctp_pcb.h> 40 #include <netinet/sctputil.h> 41 #include <netinet/sctp_var.h> 42 #include <netinet/sctp_var.h> 43 #include <netinet/sctp_sysctl.h> 44 #include <netinet/sctp.h> 45 #include <netinet/sctp_uio.h> 46 #include <netinet/sctp_peeloff.h> 47 #include <netinet/sctputil.h> 48 #include <netinet/sctp_auth.h> 49 50 #if defined(__APPLE__) 51 #define APPLE_FILE_NO 5 52 #endif 53 54 int 55 sctp_can_peel_off(struct socket *head, sctp_assoc_t assoc_id) 56 { 57 struct sctp_inpcb *inp; 58 struct sctp_tcb *stcb; 59 uint32_t state; 60 61 if (head == NULL) { 62 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, EBADF); 63 return (EBADF); 64 } 65 inp = (struct sctp_inpcb *)head->so_pcb; 66 if (inp == NULL) { 67 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, EFAULT); 68 return (EFAULT); 69 } 70 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 71 (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 72 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, EOPNOTSUPP); 73 return (EOPNOTSUPP); 74 } 75 stcb = sctp_findassociation_ep_asocid(inp, assoc_id, 1); 76 if (stcb == NULL) { 77 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_PEELOFF, ENOENT); 78 return (ENOENT); 79 } 80 state = SCTP_GET_STATE((&stcb->asoc)); 81 if ((state == SCTP_STATE_EMPTY) || 82 (state == SCTP_STATE_INUSE)) { 83 SCTP_TCB_UNLOCK(stcb); 84 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_PEELOFF, ENOTCONN); 85 return (ENOTCONN); 86 } 87 SCTP_TCB_UNLOCK(stcb); 88 /* We are clear to peel this one off */ 89 return (0); 90 } 91 92 int 93 sctp_do_peeloff(struct socket *head, struct socket *so, sctp_assoc_t assoc_id) 94 { 95 struct sctp_inpcb *inp, *n_inp; 96 struct sctp_tcb *stcb; 97 uint32_t state; 98 99 inp = (struct sctp_inpcb *)head->so_pcb; 100 if (inp == NULL) { 101 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, EFAULT); 102 return (EFAULT); 103 } 104 stcb = sctp_findassociation_ep_asocid(inp, assoc_id, 1); 105 if (stcb == NULL) { 106 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, ENOTCONN); 107 return (ENOTCONN); 108 } 109 110 state = SCTP_GET_STATE((&stcb->asoc)); 111 if ((state == SCTP_STATE_EMPTY) || 112 (state == SCTP_STATE_INUSE)) { 113 SCTP_TCB_UNLOCK(stcb); 114 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, ENOTCONN); 115 return (ENOTCONN); 116 } 117 118 n_inp = (struct sctp_inpcb *)so->so_pcb; 119 n_inp->sctp_flags = (SCTP_PCB_FLAGS_UDPTYPE | 120 SCTP_PCB_FLAGS_CONNECTED | 121 SCTP_PCB_FLAGS_IN_TCPPOOL | /* Turn on Blocking IO */ 122 (SCTP_PCB_COPY_FLAGS & inp->sctp_flags)); 123 n_inp->sctp_socket = so; 124 n_inp->sctp_features = inp->sctp_features; 125 n_inp->sctp_mobility_features = inp->sctp_mobility_features; 126 n_inp->sctp_frag_point = inp->sctp_frag_point; 127 n_inp->sctp_cmt_on_off = inp->sctp_cmt_on_off; 128 n_inp->sctp_ecn_enable = inp->sctp_ecn_enable; 129 n_inp->partial_delivery_point = inp->partial_delivery_point; 130 n_inp->sctp_context = inp->sctp_context; 131 n_inp->local_strreset_support = inp->local_strreset_support; 132 n_inp->inp_starting_point_for_iterator = NULL; 133 /* copy in the authentication parameters from the original endpoint */ 134 if (n_inp->sctp_ep.local_hmacs) 135 sctp_free_hmaclist(n_inp->sctp_ep.local_hmacs); 136 n_inp->sctp_ep.local_hmacs = 137 sctp_copy_hmaclist(inp->sctp_ep.local_hmacs); 138 if (n_inp->sctp_ep.local_auth_chunks) 139 sctp_free_chunklist(n_inp->sctp_ep.local_auth_chunks); 140 n_inp->sctp_ep.local_auth_chunks = 141 sctp_copy_chunklist(inp->sctp_ep.local_auth_chunks); 142 (void)sctp_copy_skeylist(&inp->sctp_ep.shared_keys, 143 &n_inp->sctp_ep.shared_keys); 144 #if defined(__Userspace__) 145 n_inp->ulp_info = inp->ulp_info; 146 n_inp->recv_callback = inp->recv_callback; 147 n_inp->send_callback = inp->send_callback; 148 n_inp->send_sb_threshold = inp->send_sb_threshold; 149 #endif 150 /* 151 * Now we must move it from one hash table to another and get the 152 * stcb in the right place. 153 */ 154 sctp_move_pcb_and_assoc(inp, n_inp, stcb); 155 atomic_add_int(&stcb->asoc.refcnt, 1); 156 SCTP_TCB_UNLOCK(stcb); 157 158 #if defined(__FreeBSD__) 159 sctp_pull_off_control_to_new_inp(inp, n_inp, stcb, SBL_WAIT); 160 #else 161 sctp_pull_off_control_to_new_inp(inp, n_inp, stcb, M_WAITOK); 162 #endif 163 atomic_subtract_int(&stcb->asoc.refcnt, 1); 164 165 return (0); 166 } 167 168 #if defined(HAVE_SCTP_PEELOFF_SOCKOPT) 169 struct socket * 170 sctp_get_peeloff(struct socket *head, sctp_assoc_t assoc_id, int *error) 171 { 172 #if defined(__Userspace__) 173 /* if __Userspace__ chooses to originally not support peeloff, put it here... */ 174 #endif 175 #if defined(__Panda__) 176 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, EINVAL); 177 *error = EINVAL; 178 return (NULL); 179 #else 180 struct socket *newso; 181 struct sctp_inpcb *inp, *n_inp; 182 struct sctp_tcb *stcb; 183 184 SCTPDBG(SCTP_DEBUG_PEEL1, "SCTP peel-off called\n"); 185 inp = (struct sctp_inpcb *)head->so_pcb; 186 if (inp == NULL) { 187 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, EFAULT); 188 *error = EFAULT; 189 return (NULL); 190 } 191 stcb = sctp_findassociation_ep_asocid(inp, assoc_id, 1); 192 if (stcb == NULL) { 193 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, ENOTCONN); 194 *error = ENOTCONN; 195 return (NULL); 196 } 197 atomic_add_int(&stcb->asoc.refcnt, 1); 198 SCTP_TCB_UNLOCK(stcb); 199 #if defined(__FreeBSD__) && __FreeBSD_version >= 801000 200 CURVNET_SET(head->so_vnet); 201 #endif 202 newso = sonewconn(head, SS_ISCONNECTED 203 #if defined(__APPLE__) 204 , NULL 205 #elif defined(__Panda__) 206 /* place this socket in the assoc's vrf id */ 207 , NULL, stcb->asoc.vrf_id 208 #endif 209 ); 210 #if defined(__FreeBSD__) && __FreeBSD_version >= 801000 211 CURVNET_RESTORE(); 212 #endif 213 if (newso == NULL) { 214 SCTPDBG(SCTP_DEBUG_PEEL1, "sctp_peeloff:sonewconn failed\n"); 215 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_PEELOFF, ENOMEM); 216 *error = ENOMEM; 217 atomic_subtract_int(&stcb->asoc.refcnt, 1); 218 return (NULL); 219 220 } 221 #if defined(__APPLE__) 222 else { 223 SCTP_SOCKET_LOCK(newso, 1); 224 } 225 #endif 226 SCTP_TCB_LOCK(stcb); 227 atomic_subtract_int(&stcb->asoc.refcnt, 1); 228 n_inp = (struct sctp_inpcb *)newso->so_pcb; 229 SOCK_LOCK(head); 230 n_inp->sctp_flags = (SCTP_PCB_FLAGS_UDPTYPE | 231 SCTP_PCB_FLAGS_CONNECTED | 232 SCTP_PCB_FLAGS_IN_TCPPOOL | /* Turn on Blocking IO */ 233 (SCTP_PCB_COPY_FLAGS & inp->sctp_flags)); 234 n_inp->sctp_features = inp->sctp_features; 235 n_inp->sctp_frag_point = inp->sctp_frag_point; 236 n_inp->sctp_cmt_on_off = inp->sctp_cmt_on_off; 237 n_inp->sctp_ecn_enable = inp->sctp_ecn_enable; 238 n_inp->partial_delivery_point = inp->partial_delivery_point; 239 n_inp->sctp_context = inp->sctp_context; 240 n_inp->local_strreset_support = inp->local_strreset_support; 241 n_inp->inp_starting_point_for_iterator = NULL; 242 #if defined(__Userspace__) 243 n_inp->ulp_info = inp->ulp_info; 244 n_inp->recv_callback = inp->recv_callback; 245 n_inp->send_callback = inp->send_callback; 246 n_inp->send_sb_threshold = inp->send_sb_threshold; 247 #endif 248 249 /* copy in the authentication parameters from the original endpoint */ 250 if (n_inp->sctp_ep.local_hmacs) 251 sctp_free_hmaclist(n_inp->sctp_ep.local_hmacs); 252 n_inp->sctp_ep.local_hmacs = 253 sctp_copy_hmaclist(inp->sctp_ep.local_hmacs); 254 if (n_inp->sctp_ep.local_auth_chunks) 255 sctp_free_chunklist(n_inp->sctp_ep.local_auth_chunks); 256 n_inp->sctp_ep.local_auth_chunks = 257 sctp_copy_chunklist(inp->sctp_ep.local_auth_chunks); 258 (void)sctp_copy_skeylist(&inp->sctp_ep.shared_keys, 259 &n_inp->sctp_ep.shared_keys); 260 261 n_inp->sctp_socket = newso; 262 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 263 sctp_feature_off(n_inp, SCTP_PCB_FLAGS_AUTOCLOSE); 264 n_inp->sctp_ep.auto_close_time = 0; 265 sctp_timer_stop(SCTP_TIMER_TYPE_AUTOCLOSE, n_inp, stcb, NULL, 266 SCTP_FROM_SCTP_PEELOFF+SCTP_LOC_1); 267 } 268 /* Turn off any non-blocking semantic. */ 269 SCTP_CLEAR_SO_NBIO(newso); 270 newso->so_state |= SS_ISCONNECTED; 271 /* We remove it right away */ 272 273 #if defined(__FreeBSD__) || defined(__APPLE__) || defined(__Windows__) || defined(__Userspace__) 274 #ifdef SCTP_LOCK_LOGGING 275 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOCK_LOGGING_ENABLE) { 276 sctp_log_lock(inp, (struct sctp_tcb *)NULL, SCTP_LOG_LOCK_SOCK); 277 } 278 #endif 279 TAILQ_REMOVE(&head->so_comp, newso, so_list); 280 head->so_qlen--; 281 SOCK_UNLOCK(head); 282 #else 283 newso = TAILQ_FIRST(&head->so_q); 284 if (soqremque(newso, 1) == 0) { 285 SCTP_PRINTF("soremque failed, peeloff-fails (invarients would panic)\n"); 286 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, ENOTCONN); 287 *error = ENOTCONN; 288 return (NULL); 289 290 } 291 #endif 292 /* 293 * Now we must move it from one hash table to another and get the 294 * stcb in the right place. 295 */ 296 sctp_move_pcb_and_assoc(inp, n_inp, stcb); 297 atomic_add_int(&stcb->asoc.refcnt, 1); 298 SCTP_TCB_UNLOCK(stcb); 299 /* 300 * And now the final hack. We move data in the pending side i.e. 301 * head to the new socket buffer. Let the GRUBBING begin :-0 302 */ 303 #if defined(__FreeBSD__) 304 sctp_pull_off_control_to_new_inp(inp, n_inp, stcb, SBL_WAIT); 305 #else 306 sctp_pull_off_control_to_new_inp(inp, n_inp, stcb, M_WAITOK); 307 #endif 308 atomic_subtract_int(&stcb->asoc.refcnt, 1); 309 return (newso); 310 #endif 311 } 312 #endif 313
