sctp_peeloff.c revision 233660
1/*- 2 * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved. 3 * Copyright (c) 2008-2011, by Randall Stewart. All rights reserved. 4 * Copyright (c) 2008-2011, 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 34/* $KAME: sctp_peeloff.c,v 1.13 2005/03/06 16:04:18 itojun Exp $ */ 35 36#include <sys/cdefs.h> 37__FBSDID("$FreeBSD: head/sys/netinet/sctp_peeloff.c 233660 2012-03-29 13:36:53Z rrs $"); 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 51int 52sctp_can_peel_off(struct socket *head, sctp_assoc_t assoc_id) 53{ 54 struct sctp_inpcb *inp; 55 struct sctp_tcb *stcb; 56 uint32_t state; 57 58 if (head == NULL) { 59 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, EBADF); 60 return (EBADF); 61 } 62 inp = (struct sctp_inpcb *)head->so_pcb; 63 if (inp == NULL) { 64 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, EFAULT); 65 return (EFAULT); 66 } 67 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 68 (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 69 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, EOPNOTSUPP); 70 return (EOPNOTSUPP); 71 } 72 stcb = sctp_findassociation_ep_asocid(inp, assoc_id, 1); 73 if (stcb == NULL) { 74 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_PEELOFF, ENOENT); 75 return (ENOENT); 76 } 77 state = SCTP_GET_STATE((&stcb->asoc)); 78 if ((state == SCTP_STATE_EMPTY) || 79 (state == SCTP_STATE_INUSE) || 80 (state == SCTP_STATE_COOKIE_WAIT) || 81 (state == SCTP_STATE_COOKIE_ECHOED)) { 82 SCTP_TCB_UNLOCK(stcb); 83 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_PEELOFF, ENOTCONN); 84 return (ENOTCONN); 85 } 86 SCTP_TCB_UNLOCK(stcb); 87 /* We are clear to peel this one off */ 88 return (0); 89} 90 91int 92sctp_do_peeloff(struct socket *head, struct socket *so, sctp_assoc_t assoc_id) 93{ 94 struct sctp_inpcb *inp, *n_inp; 95 struct sctp_tcb *stcb; 96 uint32_t state; 97 98 inp = (struct sctp_inpcb *)head->so_pcb; 99 if (inp == NULL) { 100 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, EFAULT); 101 return (EFAULT); 102 } 103 stcb = sctp_findassociation_ep_asocid(inp, assoc_id, 1); 104 if (stcb == NULL) { 105 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, ENOTCONN); 106 return (ENOTCONN); 107 } 108 state = SCTP_GET_STATE((&stcb->asoc)); 109 if ((state == SCTP_STATE_EMPTY) || 110 (state == SCTP_STATE_INUSE) || 111 (state == SCTP_STATE_COOKIE_WAIT) || 112 (state == SCTP_STATE_COOKIE_ECHOED)) { 113 SCTP_TCB_UNLOCK(stcb); 114 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, ENOTCONN); 115 return (ENOTCONN); 116 } 117 n_inp = (struct sctp_inpcb *)so->so_pcb; 118 n_inp->sctp_flags = (SCTP_PCB_FLAGS_UDPTYPE | 119 SCTP_PCB_FLAGS_CONNECTED | 120 SCTP_PCB_FLAGS_IN_TCPPOOL | /* Turn on Blocking IO */ 121 (SCTP_PCB_COPY_FLAGS & inp->sctp_flags)); 122 n_inp->sctp_socket = so; 123 n_inp->sctp_features = inp->sctp_features; 124 n_inp->sctp_mobility_features = inp->sctp_mobility_features; 125 n_inp->sctp_frag_point = inp->sctp_frag_point; 126 n_inp->sctp_cmt_on_off = inp->sctp_cmt_on_off; 127 n_inp->sctp_ecn_enable = inp->sctp_ecn_enable; 128 n_inp->partial_delivery_point = inp->partial_delivery_point; 129 n_inp->sctp_context = inp->sctp_context; 130 n_inp->local_strreset_support = inp->local_strreset_support; 131 n_inp->inp_starting_point_for_iterator = NULL; 132 /* copy in the authentication parameters from the original endpoint */ 133 if (n_inp->sctp_ep.local_hmacs) 134 sctp_free_hmaclist(n_inp->sctp_ep.local_hmacs); 135 n_inp->sctp_ep.local_hmacs = 136 sctp_copy_hmaclist(inp->sctp_ep.local_hmacs); 137 if (n_inp->sctp_ep.local_auth_chunks) 138 sctp_free_chunklist(n_inp->sctp_ep.local_auth_chunks); 139 n_inp->sctp_ep.local_auth_chunks = 140 sctp_copy_chunklist(inp->sctp_ep.local_auth_chunks); 141 (void)sctp_copy_skeylist(&inp->sctp_ep.shared_keys, 142 &n_inp->sctp_ep.shared_keys); 143 /* 144 * Now we must move it from one hash table to another and get the 145 * stcb in the right place. 146 */ 147 sctp_move_pcb_and_assoc(inp, n_inp, stcb); 148 atomic_add_int(&stcb->asoc.refcnt, 1); 149 SCTP_TCB_UNLOCK(stcb); 150 151 sctp_pull_off_control_to_new_inp(inp, n_inp, stcb, SBL_WAIT); 152 atomic_subtract_int(&stcb->asoc.refcnt, 1); 153 154 return (0); 155} 156 157 158struct socket * 159sctp_get_peeloff(struct socket *head, sctp_assoc_t assoc_id, int *error) 160{ 161 struct socket *newso; 162 struct sctp_inpcb *inp, *n_inp; 163 struct sctp_tcb *stcb; 164 165 SCTPDBG(SCTP_DEBUG_PEEL1, "SCTP peel-off called\n"); 166 inp = (struct sctp_inpcb *)head->so_pcb; 167 if (inp == NULL) { 168 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, EFAULT); 169 *error = EFAULT; 170 return (NULL); 171 } 172 stcb = sctp_findassociation_ep_asocid(inp, assoc_id, 1); 173 if (stcb == NULL) { 174 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, ENOTCONN); 175 *error = ENOTCONN; 176 return (NULL); 177 } 178 atomic_add_int(&stcb->asoc.refcnt, 1); 179 SCTP_TCB_UNLOCK(stcb); 180 CURVNET_SET(head->so_vnet); 181 newso = sonewconn(head, SS_ISCONNECTED 182 ); 183 CURVNET_RESTORE(); 184 if (newso == NULL) { 185 SCTPDBG(SCTP_DEBUG_PEEL1, "sctp_peeloff:sonewconn failed\n"); 186 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_PEELOFF, ENOMEM); 187 *error = ENOMEM; 188 atomic_subtract_int(&stcb->asoc.refcnt, 1); 189 return (NULL); 190 191 } 192 SCTP_TCB_LOCK(stcb); 193 atomic_subtract_int(&stcb->asoc.refcnt, 1); 194 n_inp = (struct sctp_inpcb *)newso->so_pcb; 195 SOCK_LOCK(head); 196 n_inp->sctp_flags = (SCTP_PCB_FLAGS_UDPTYPE | 197 SCTP_PCB_FLAGS_CONNECTED | 198 SCTP_PCB_FLAGS_IN_TCPPOOL | /* Turn on Blocking IO */ 199 (SCTP_PCB_COPY_FLAGS & inp->sctp_flags)); 200 n_inp->sctp_features = inp->sctp_features; 201 n_inp->sctp_frag_point = inp->sctp_frag_point; 202 n_inp->sctp_cmt_on_off = inp->sctp_cmt_on_off; 203 n_inp->sctp_ecn_enable = inp->sctp_ecn_enable; 204 n_inp->partial_delivery_point = inp->partial_delivery_point; 205 n_inp->sctp_context = inp->sctp_context; 206 n_inp->local_strreset_support = inp->local_strreset_support; 207 n_inp->inp_starting_point_for_iterator = NULL; 208 209 /* copy in the authentication parameters from the original endpoint */ 210 if (n_inp->sctp_ep.local_hmacs) 211 sctp_free_hmaclist(n_inp->sctp_ep.local_hmacs); 212 n_inp->sctp_ep.local_hmacs = 213 sctp_copy_hmaclist(inp->sctp_ep.local_hmacs); 214 if (n_inp->sctp_ep.local_auth_chunks) 215 sctp_free_chunklist(n_inp->sctp_ep.local_auth_chunks); 216 n_inp->sctp_ep.local_auth_chunks = 217 sctp_copy_chunklist(inp->sctp_ep.local_auth_chunks); 218 (void)sctp_copy_skeylist(&inp->sctp_ep.shared_keys, 219 &n_inp->sctp_ep.shared_keys); 220 221 n_inp->sctp_socket = newso; 222 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 223 sctp_feature_off(n_inp, SCTP_PCB_FLAGS_AUTOCLOSE); 224 n_inp->sctp_ep.auto_close_time = 0; 225 sctp_timer_stop(SCTP_TIMER_TYPE_AUTOCLOSE, n_inp, stcb, NULL, 226 SCTP_FROM_SCTP_PEELOFF + SCTP_LOC_1); 227 } 228 /* Turn off any non-blocking semantic. */ 229 SCTP_CLEAR_SO_NBIO(newso); 230 newso->so_state |= SS_ISCONNECTED; 231 /* We remove it right away */ 232 233#ifdef SCTP_LOCK_LOGGING 234 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOCK_LOGGING_ENABLE) { 235 sctp_log_lock(inp, (struct sctp_tcb *)NULL, SCTP_LOG_LOCK_SOCK); 236 } 237#endif 238 TAILQ_REMOVE(&head->so_comp, newso, so_list); 239 head->so_qlen--; 240 SOCK_UNLOCK(head); 241 /* 242 * Now we must move it from one hash table to another and get the 243 * stcb in the right place. 244 */ 245 sctp_move_pcb_and_assoc(inp, n_inp, stcb); 246 atomic_add_int(&stcb->asoc.refcnt, 1); 247 SCTP_TCB_UNLOCK(stcb); 248 /* 249 * And now the final hack. We move data in the pending side i.e. 250 * head to the new socket buffer. Let the GRUBBING begin :-0 251 */ 252 sctp_pull_off_control_to_new_inp(inp, n_inp, stcb, SBL_WAIT); 253 atomic_subtract_int(&stcb->asoc.refcnt, 1); 254 return (newso); 255} 256