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("$FreeBSD$"); 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 51 int 52 sctp_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 if ((head->so_proto->pr_protocol != IPPROTO_SCTP) || 63 (head->so_type != SOCK_SEQPACKET)) { 64 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, EOPNOTSUPP); 65 return (EOPNOTSUPP); 66 } 67 inp = (struct sctp_inpcb *)head->so_pcb; 68 if (inp == NULL) { 69 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, EFAULT); 70 return (EFAULT); 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 91 int 92 sctp_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->inp_starting_point_for_iterator = NULL; 131 /* copy in the authentication parameters from the original endpoint */ 132 if (n_inp->sctp_ep.local_hmacs) 133 sctp_free_hmaclist(n_inp->sctp_ep.local_hmacs); 134 n_inp->sctp_ep.local_hmacs = 135 sctp_copy_hmaclist(inp->sctp_ep.local_hmacs); 136 if (n_inp->sctp_ep.local_auth_chunks) 137 sctp_free_chunklist(n_inp->sctp_ep.local_auth_chunks); 138 n_inp->sctp_ep.local_auth_chunks = 139 sctp_copy_chunklist(inp->sctp_ep.local_auth_chunks); 140 (void)sctp_copy_skeylist(&inp->sctp_ep.shared_keys, 141 &n_inp->sctp_ep.shared_keys); 142 /* 143 * Now we must move it from one hash table to another and get the 144 * stcb in the right place. 145 */ 146 sctp_move_pcb_and_assoc(inp, n_inp, stcb); 147 atomic_add_int(&stcb->asoc.refcnt, 1); 148 SCTP_TCB_UNLOCK(stcb); 149 150 sctp_pull_off_control_to_new_inp(inp, n_inp, stcb, SBL_WAIT); 151 atomic_subtract_int(&stcb->asoc.refcnt, 1); 152 153 return (0); 154 } 155 156 157 struct socket * 158 sctp_get_peeloff(struct socket *head, sctp_assoc_t assoc_id, int *error) 159 { 160 struct socket *newso; 161 struct sctp_inpcb *inp, *n_inp; 162 struct sctp_tcb *stcb; 163 164 SCTPDBG(SCTP_DEBUG_PEEL1, "SCTP peel-off called\n"); 165 inp = (struct sctp_inpcb *)head->so_pcb; 166 if (inp == NULL) { 167 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, EFAULT); 168 *error = EFAULT; 169 return (NULL); 170 } 171 stcb = sctp_findassociation_ep_asocid(inp, assoc_id, 1); 172 if (stcb == NULL) { 173 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, ENOTCONN); 174 *error = ENOTCONN; 175 return (NULL); 176 } 177 atomic_add_int(&stcb->asoc.refcnt, 1); 178 SCTP_TCB_UNLOCK(stcb); 179 CURVNET_SET(head->so_vnet); 180 newso = sonewconn(head, SS_ISCONNECTED 181 ); 182 CURVNET_RESTORE(); 183 if (newso == NULL) { 184 SCTPDBG(SCTP_DEBUG_PEEL1, "sctp_peeloff:sonewconn failed\n"); 185 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_PEELOFF, ENOMEM); 186 *error = ENOMEM; 187 atomic_subtract_int(&stcb->asoc.refcnt, 1); 188 return (NULL); 189 190 } 191 SCTP_TCB_LOCK(stcb); 192 atomic_subtract_int(&stcb->asoc.refcnt, 1); 193 n_inp = (struct sctp_inpcb *)newso->so_pcb; 194 SOCK_LOCK(head); 195 n_inp->sctp_flags = (SCTP_PCB_FLAGS_UDPTYPE | 196 SCTP_PCB_FLAGS_CONNECTED | 197 SCTP_PCB_FLAGS_IN_TCPPOOL | /* Turn on Blocking IO */ 198 (SCTP_PCB_COPY_FLAGS & inp->sctp_flags)); 199 n_inp->sctp_features = inp->sctp_features; 200 n_inp->sctp_frag_point = inp->sctp_frag_point; 201 n_inp->sctp_cmt_on_off = inp->sctp_cmt_on_off; 202 n_inp->sctp_ecn_enable = inp->sctp_ecn_enable; 203 n_inp->partial_delivery_point = inp->partial_delivery_point; 204 n_inp->sctp_context = inp->sctp_context; 205 n_inp->inp_starting_point_for_iterator = NULL; 206 207 /* copy in the authentication parameters from the original endpoint */ 208 if (n_inp->sctp_ep.local_hmacs) 209 sctp_free_hmaclist(n_inp->sctp_ep.local_hmacs); 210 n_inp->sctp_ep.local_hmacs = 211 sctp_copy_hmaclist(inp->sctp_ep.local_hmacs); 212 if (n_inp->sctp_ep.local_auth_chunks) 213 sctp_free_chunklist(n_inp->sctp_ep.local_auth_chunks); 214 n_inp->sctp_ep.local_auth_chunks = 215 sctp_copy_chunklist(inp->sctp_ep.local_auth_chunks); 216 (void)sctp_copy_skeylist(&inp->sctp_ep.shared_keys, 217 &n_inp->sctp_ep.shared_keys); 218 219 n_inp->sctp_socket = newso; 220 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 221 sctp_feature_off(n_inp, SCTP_PCB_FLAGS_AUTOCLOSE); 222 n_inp->sctp_ep.auto_close_time = 0; 223 sctp_timer_stop(SCTP_TIMER_TYPE_AUTOCLOSE, n_inp, stcb, NULL, 224 SCTP_FROM_SCTP_PEELOFF + SCTP_LOC_1); 225 } 226 /* Turn off any non-blocking semantic. */ 227 SCTP_CLEAR_SO_NBIO(newso); 228 newso->so_state |= SS_ISCONNECTED; 229 /* We remove it right away */ 230 231 #ifdef SCTP_LOCK_LOGGING 232 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOCK_LOGGING_ENABLE) { 233 sctp_log_lock(inp, (struct sctp_tcb *)NULL, SCTP_LOG_LOCK_SOCK); 234 } 235 #endif 236 TAILQ_REMOVE(&head->so_comp, newso, so_list); 237 head->so_qlen--; 238 SOCK_UNLOCK(head); 239 /* 240 * Now we must move it from one hash table to another and get the 241 * stcb in the right place. 242 */ 243 sctp_move_pcb_and_assoc(inp, n_inp, stcb); 244 atomic_add_int(&stcb->asoc.refcnt, 1); 245 SCTP_TCB_UNLOCK(stcb); 246 /* 247 * And now the final hack. We move data in the pending side i.e. 248 * head to the new socket buffer. Let the GRUBBING begin :-0 249 */ 250 sctp_pull_off_control_to_new_inp(inp, n_inp, stcb, SBL_WAIT); 251 atomic_subtract_int(&stcb->asoc.refcnt, 1); 252 return (newso); 253 } 254