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 269858 2014-08-12 11:30:16Z 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 54int 55sctp_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 92int 93sctp_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->ecn_supported = inp->ecn_supported; 129 n_inp->prsctp_supported = inp->prsctp_supported; 130 n_inp->auth_supported = inp->auth_supported; 131 n_inp->asconf_supported = inp->asconf_supported; 132 n_inp->reconfig_supported = inp->reconfig_supported; 133 n_inp->nrsack_supported = inp->nrsack_supported; 134 n_inp->pktdrop_supported = inp->pktdrop_supported; 135 n_inp->partial_delivery_point = inp->partial_delivery_point; 136 n_inp->sctp_context = inp->sctp_context; 137 n_inp->local_strreset_support = inp->local_strreset_support; 138 n_inp->inp_starting_point_for_iterator = NULL; 139 /* copy in the authentication parameters from the original endpoint */ 140 if (n_inp->sctp_ep.local_hmacs) 141 sctp_free_hmaclist(n_inp->sctp_ep.local_hmacs); 142 n_inp->sctp_ep.local_hmacs = 143 sctp_copy_hmaclist(inp->sctp_ep.local_hmacs); 144 if (n_inp->sctp_ep.local_auth_chunks) 145 sctp_free_chunklist(n_inp->sctp_ep.local_auth_chunks); 146 n_inp->sctp_ep.local_auth_chunks = 147 sctp_copy_chunklist(inp->sctp_ep.local_auth_chunks); 148 (void)sctp_copy_skeylist(&inp->sctp_ep.shared_keys, 149 &n_inp->sctp_ep.shared_keys); 150#if defined(__Userspace__) 151 n_inp->ulp_info = inp->ulp_info; 152 n_inp->recv_callback = inp->recv_callback; 153 n_inp->send_callback = inp->send_callback; 154 n_inp->send_sb_threshold = inp->send_sb_threshold; 155#endif 156 /* 157 * Now we must move it from one hash table to another and get the 158 * stcb in the right place. 159 */ 160 sctp_move_pcb_and_assoc(inp, n_inp, stcb); 161 atomic_add_int(&stcb->asoc.refcnt, 1); 162 SCTP_TCB_UNLOCK(stcb); 163 164#if defined(__FreeBSD__) 165 sctp_pull_off_control_to_new_inp(inp, n_inp, stcb, SBL_WAIT); 166#else 167 sctp_pull_off_control_to_new_inp(inp, n_inp, stcb, M_WAITOK); 168#endif 169 atomic_subtract_int(&stcb->asoc.refcnt, 1); 170 171 return (0); 172} 173 174#if defined(HAVE_SCTP_PEELOFF_SOCKOPT) 175struct socket * 176sctp_get_peeloff(struct socket *head, sctp_assoc_t assoc_id, int *error) 177{ 178#if defined(__Userspace__) 179 /* if __Userspace__ chooses to originally not support peeloff, put it here... */ 180#endif 181#if defined(__Panda__) 182 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, EINVAL); 183 *error = EINVAL; 184 return (NULL); 185#else 186 struct socket *newso; 187 struct sctp_inpcb *inp, *n_inp; 188 struct sctp_tcb *stcb; 189 190 SCTPDBG(SCTP_DEBUG_PEEL1, "SCTP peel-off called\n"); 191 inp = (struct sctp_inpcb *)head->so_pcb; 192 if (inp == NULL) { 193 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, EFAULT); 194 *error = EFAULT; 195 return (NULL); 196 } 197 stcb = sctp_findassociation_ep_asocid(inp, assoc_id, 1); 198 if (stcb == NULL) { 199 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, ENOTCONN); 200 *error = ENOTCONN; 201 return (NULL); 202 } 203 atomic_add_int(&stcb->asoc.refcnt, 1); 204 SCTP_TCB_UNLOCK(stcb); 205#if defined(__FreeBSD__) && __FreeBSD_version >= 801000 206 CURVNET_SET(head->so_vnet); 207#endif 208 newso = sonewconn(head, SS_ISCONNECTED 209#if defined(__APPLE__) 210 , NULL 211#elif defined(__Panda__) 212 /* place this socket in the assoc's vrf id */ 213 , NULL, stcb->asoc.vrf_id 214#endif 215 ); 216#if defined(__FreeBSD__) && __FreeBSD_version >= 801000 217 CURVNET_RESTORE(); 218#endif 219 if (newso == NULL) { 220 SCTPDBG(SCTP_DEBUG_PEEL1, "sctp_peeloff:sonewconn failed\n"); 221 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_PEELOFF, ENOMEM); 222 *error = ENOMEM; 223 atomic_subtract_int(&stcb->asoc.refcnt, 1); 224 return (NULL); 225 226 } 227#if defined(__APPLE__) 228 else { 229 SCTP_SOCKET_LOCK(newso, 1); 230 } 231#endif 232 SCTP_TCB_LOCK(stcb); 233 atomic_subtract_int(&stcb->asoc.refcnt, 1); 234 n_inp = (struct sctp_inpcb *)newso->so_pcb; 235 SOCK_LOCK(head); 236 n_inp->sctp_flags = (SCTP_PCB_FLAGS_UDPTYPE | 237 SCTP_PCB_FLAGS_CONNECTED | 238 SCTP_PCB_FLAGS_IN_TCPPOOL | /* Turn on Blocking IO */ 239 (SCTP_PCB_COPY_FLAGS & inp->sctp_flags)); 240 n_inp->sctp_features = inp->sctp_features; 241 n_inp->sctp_frag_point = inp->sctp_frag_point; 242 n_inp->sctp_cmt_on_off = inp->sctp_cmt_on_off; 243 n_inp->ecn_supported = inp->ecn_supported; 244 n_inp->prsctp_supported = inp->prsctp_supported; 245 n_inp->auth_supported = inp->auth_supported; 246 n_inp->asconf_supported = inp->asconf_supported; 247 n_inp->reconfig_supported = inp->reconfig_supported; 248 n_inp->nrsack_supported = inp->nrsack_supported; 249 n_inp->pktdrop_supported = inp->pktdrop_supported; 250 n_inp->partial_delivery_point = inp->partial_delivery_point; 251 n_inp->sctp_context = inp->sctp_context; 252 n_inp->local_strreset_support = inp->local_strreset_support; 253 n_inp->inp_starting_point_for_iterator = NULL; 254#if defined(__Userspace__) 255 n_inp->ulp_info = inp->ulp_info; 256 n_inp->recv_callback = inp->recv_callback; 257 n_inp->send_callback = inp->send_callback; 258 n_inp->send_sb_threshold = inp->send_sb_threshold; 259#endif 260 261 /* copy in the authentication parameters from the original endpoint */ 262 if (n_inp->sctp_ep.local_hmacs) 263 sctp_free_hmaclist(n_inp->sctp_ep.local_hmacs); 264 n_inp->sctp_ep.local_hmacs = 265 sctp_copy_hmaclist(inp->sctp_ep.local_hmacs); 266 if (n_inp->sctp_ep.local_auth_chunks) 267 sctp_free_chunklist(n_inp->sctp_ep.local_auth_chunks); 268 n_inp->sctp_ep.local_auth_chunks = 269 sctp_copy_chunklist(inp->sctp_ep.local_auth_chunks); 270 (void)sctp_copy_skeylist(&inp->sctp_ep.shared_keys, 271 &n_inp->sctp_ep.shared_keys); 272 273 n_inp->sctp_socket = newso; 274 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 275 sctp_feature_off(n_inp, SCTP_PCB_FLAGS_AUTOCLOSE); 276 n_inp->sctp_ep.auto_close_time = 0; 277 sctp_timer_stop(SCTP_TIMER_TYPE_AUTOCLOSE, n_inp, stcb, NULL, 278 SCTP_FROM_SCTP_PEELOFF+SCTP_LOC_1); 279 } 280 /* Turn off any non-blocking semantic. */ 281 SCTP_CLEAR_SO_NBIO(newso); 282 newso->so_state |= SS_ISCONNECTED; 283 /* We remove it right away */ 284 285#if defined(__FreeBSD__) || defined(__APPLE__) || defined(__Windows__) || defined(__Userspace__) 286#ifdef SCTP_LOCK_LOGGING 287 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOCK_LOGGING_ENABLE) { 288 sctp_log_lock(inp, (struct sctp_tcb *)NULL, SCTP_LOG_LOCK_SOCK); 289 } 290#endif 291 TAILQ_REMOVE(&head->so_comp, newso, so_list); 292 head->so_qlen--; 293 SOCK_UNLOCK(head); 294#else 295 newso = TAILQ_FIRST(&head->so_q); 296 if (soqremque(newso, 1) == 0) { 297 SCTP_PRINTF("soremque failed, peeloff-fails (invarients would panic)\n"); 298 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, ENOTCONN); 299 *error = ENOTCONN; 300 return (NULL); 301 302 } 303#endif 304 /* 305 * Now we must move it from one hash table to another and get the 306 * stcb in the right place. 307 */ 308 sctp_move_pcb_and_assoc(inp, n_inp, stcb); 309 atomic_add_int(&stcb->asoc.refcnt, 1); 310 SCTP_TCB_UNLOCK(stcb); 311 /* 312 * And now the final hack. We move data in the pending side i.e. 313 * head to the new socket buffer. Let the GRUBBING begin :-0 314 */ 315#if defined(__FreeBSD__) 316 sctp_pull_off_control_to_new_inp(inp, n_inp, stcb, SBL_WAIT); 317#else 318 sctp_pull_off_control_to_new_inp(inp, n_inp, stcb, M_WAITOK); 319#endif 320 atomic_subtract_int(&stcb->asoc.refcnt, 1); 321 return (newso); 322#endif 323} 324#endif 325