Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/netinet/sctp_peeloff.c
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1 /*- 2 * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are met: 6 * 7 * a) Redistributions of source code must retain the above copyright notice, 8 * this list of conditions and the following disclaimer. 9 * 10 * b) Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in 12 * the documentation and/or other materials provided with the distribution. 13 * 14 * c) Neither the name of Cisco Systems, Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived 16 * from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 20 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 28 * THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 32 /* $KAME: sctp_peeloff.c,v 1.13 2005/03/06 16:04:18 itojun Exp $ */ 33 34 #include <sys/cdefs.h> 35 __FBSDID("$FreeBSD: releng/8.2/sys/netinet/sctp_peeloff.c 214462 2010-10-28 16:58:12Z tuexen $"); 36 #include <netinet/sctp_os.h> 37 #include <netinet/sctp_pcb.h> 38 #include <netinet/sctputil.h> 39 #include <netinet/sctp_var.h> 40 #include <netinet/sctp_var.h> 41 #include <netinet/sctp_sysctl.h> 42 #include <netinet/sctp.h> 43 #include <netinet/sctp_uio.h> 44 #include <netinet/sctp_peeloff.h> 45 #include <netinet/sctputil.h> 46 #include <netinet/sctp_auth.h> 47 48 49 int 50 sctp_can_peel_off(struct socket *head, sctp_assoc_t assoc_id) 51 { 52 struct sctp_inpcb *inp; 53 struct sctp_tcb *stcb; 54 uint32_t state; 55 56 inp = (struct sctp_inpcb *)head->so_pcb; 57 if (inp == NULL) { 58 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, EFAULT); 59 return (EFAULT); 60 } 61 stcb = sctp_findassociation_ep_asocid(inp, assoc_id, 1); 62 if (stcb == NULL) { 63 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_PEELOFF, ENOENT); 64 return (ENOENT); 65 } 66 state = SCTP_GET_STATE((&stcb->asoc)); 67 if ((state == SCTP_STATE_EMPTY) || 68 (state == SCTP_STATE_INUSE) || 69 (state == SCTP_STATE_COOKIE_WAIT) || 70 (state == SCTP_STATE_COOKIE_ECHOED)) { 71 SCTP_TCB_UNLOCK(stcb); 72 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_PEELOFF, ENOTCONN); 73 return (ENOTCONN); 74 } 75 SCTP_TCB_UNLOCK(stcb); 76 /* We are clear to peel this one off */ 77 return (0); 78 } 79 80 int 81 sctp_do_peeloff(struct socket *head, struct socket *so, sctp_assoc_t assoc_id) 82 { 83 struct sctp_inpcb *inp, *n_inp; 84 struct sctp_tcb *stcb; 85 uint32_t state; 86 87 inp = (struct sctp_inpcb *)head->so_pcb; 88 if (inp == NULL) { 89 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, EFAULT); 90 return (EFAULT); 91 } 92 stcb = sctp_findassociation_ep_asocid(inp, assoc_id, 1); 93 if (stcb == NULL) { 94 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, ENOTCONN); 95 return (ENOTCONN); 96 } 97 state = SCTP_GET_STATE((&stcb->asoc)); 98 if ((state == SCTP_STATE_EMPTY) || 99 (state == SCTP_STATE_INUSE) || 100 (state == SCTP_STATE_COOKIE_WAIT) || 101 (state == SCTP_STATE_COOKIE_ECHOED)) { 102 SCTP_TCB_UNLOCK(stcb); 103 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, ENOTCONN); 104 return (ENOTCONN); 105 } 106 n_inp = (struct sctp_inpcb *)so->so_pcb; 107 n_inp->sctp_flags = (SCTP_PCB_FLAGS_UDPTYPE | 108 SCTP_PCB_FLAGS_CONNECTED | 109 SCTP_PCB_FLAGS_IN_TCPPOOL | /* Turn on Blocking IO */ 110 (SCTP_PCB_COPY_FLAGS & inp->sctp_flags)); 111 n_inp->sctp_socket = so; 112 n_inp->sctp_features = inp->sctp_features; 113 n_inp->sctp_mobility_features = inp->sctp_mobility_features; 114 n_inp->sctp_frag_point = inp->sctp_frag_point; 115 n_inp->sctp_cmt_on_off = inp->sctp_cmt_on_off; 116 n_inp->partial_delivery_point = inp->partial_delivery_point; 117 n_inp->sctp_context = inp->sctp_context; 118 n_inp->inp_starting_point_for_iterator = NULL; 119 /* copy in the authentication parameters from the original endpoint */ 120 if (n_inp->sctp_ep.local_hmacs) 121 sctp_free_hmaclist(n_inp->sctp_ep.local_hmacs); 122 n_inp->sctp_ep.local_hmacs = 123 sctp_copy_hmaclist(inp->sctp_ep.local_hmacs); 124 if (n_inp->sctp_ep.local_auth_chunks) 125 sctp_free_chunklist(n_inp->sctp_ep.local_auth_chunks); 126 n_inp->sctp_ep.local_auth_chunks = 127 sctp_copy_chunklist(inp->sctp_ep.local_auth_chunks); 128 (void)sctp_copy_skeylist(&inp->sctp_ep.shared_keys, 129 &n_inp->sctp_ep.shared_keys); 130 /* 131 * Now we must move it from one hash table to another and get the 132 * stcb in the right place. 133 */ 134 sctp_move_pcb_and_assoc(inp, n_inp, stcb); 135 atomic_add_int(&stcb->asoc.refcnt, 1); 136 SCTP_TCB_UNLOCK(stcb); 137 138 sctp_pull_off_control_to_new_inp(inp, n_inp, stcb, SBL_WAIT); 139 atomic_subtract_int(&stcb->asoc.refcnt, 1); 140 141 return (0); 142 } 143 144 145 struct socket * 146 sctp_get_peeloff(struct socket *head, sctp_assoc_t assoc_id, int *error) 147 { 148 struct socket *newso; 149 struct sctp_inpcb *inp, *n_inp; 150 struct sctp_tcb *stcb; 151 152 SCTPDBG(SCTP_DEBUG_PEEL1, "SCTP peel-off called\n"); 153 inp = (struct sctp_inpcb *)head->so_pcb; 154 if (inp == NULL) { 155 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, EFAULT); 156 *error = EFAULT; 157 return (NULL); 158 } 159 stcb = sctp_findassociation_ep_asocid(inp, assoc_id, 1); 160 if (stcb == NULL) { 161 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, ENOTCONN); 162 *error = ENOTCONN; 163 return (NULL); 164 } 165 atomic_add_int(&stcb->asoc.refcnt, 1); 166 SCTP_TCB_UNLOCK(stcb); 167 newso = sonewconn(head, SS_ISCONNECTED 168 ); 169 if (newso == NULL) { 170 SCTPDBG(SCTP_DEBUG_PEEL1, "sctp_peeloff:sonewconn failed\n"); 171 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_PEELOFF, ENOMEM); 172 *error = ENOMEM; 173 atomic_subtract_int(&stcb->asoc.refcnt, 1); 174 return (NULL); 175 176 } 177 SCTP_TCB_LOCK(stcb); 178 atomic_subtract_int(&stcb->asoc.refcnt, 1); 179 n_inp = (struct sctp_inpcb *)newso->so_pcb; 180 SOCK_LOCK(head); 181 n_inp->sctp_flags = (SCTP_PCB_FLAGS_UDPTYPE | 182 SCTP_PCB_FLAGS_CONNECTED | 183 SCTP_PCB_FLAGS_IN_TCPPOOL | /* Turn on Blocking IO */ 184 (SCTP_PCB_COPY_FLAGS & inp->sctp_flags)); 185 n_inp->sctp_features = inp->sctp_features; 186 n_inp->sctp_frag_point = inp->sctp_frag_point; 187 n_inp->sctp_cmt_on_off = inp->sctp_cmt_on_off; 188 n_inp->partial_delivery_point = inp->partial_delivery_point; 189 n_inp->sctp_context = inp->sctp_context; 190 n_inp->inp_starting_point_for_iterator = NULL; 191 192 /* copy in the authentication parameters from the original endpoint */ 193 if (n_inp->sctp_ep.local_hmacs) 194 sctp_free_hmaclist(n_inp->sctp_ep.local_hmacs); 195 n_inp->sctp_ep.local_hmacs = 196 sctp_copy_hmaclist(inp->sctp_ep.local_hmacs); 197 if (n_inp->sctp_ep.local_auth_chunks) 198 sctp_free_chunklist(n_inp->sctp_ep.local_auth_chunks); 199 n_inp->sctp_ep.local_auth_chunks = 200 sctp_copy_chunklist(inp->sctp_ep.local_auth_chunks); 201 (void)sctp_copy_skeylist(&inp->sctp_ep.shared_keys, 202 &n_inp->sctp_ep.shared_keys); 203 204 n_inp->sctp_socket = newso; 205 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 206 sctp_feature_off(n_inp, SCTP_PCB_FLAGS_AUTOCLOSE); 207 n_inp->sctp_ep.auto_close_time = 0; 208 sctp_timer_stop(SCTP_TIMER_TYPE_AUTOCLOSE, n_inp, stcb, NULL, 209 SCTP_FROM_SCTP_PEELOFF + SCTP_LOC_1); 210 } 211 /* Turn off any non-blocking semantic. */ 212 SCTP_CLEAR_SO_NBIO(newso); 213 newso->so_state |= SS_ISCONNECTED; 214 /* We remove it right away */ 215 216 #ifdef SCTP_LOCK_LOGGING 217 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOCK_LOGGING_ENABLE) { 218 sctp_log_lock(inp, (struct sctp_tcb *)NULL, SCTP_LOG_LOCK_SOCK); 219 } 220 #endif 221 TAILQ_REMOVE(&head->so_comp, newso, so_list); 222 head->so_qlen--; 223 SOCK_UNLOCK(head); 224 /* 225 * Now we must move it from one hash table to another and get the 226 * stcb in the right place. 227 */ 228 sctp_move_pcb_and_assoc(inp, n_inp, stcb); 229 atomic_add_int(&stcb->asoc.refcnt, 1); 230 SCTP_TCB_UNLOCK(stcb); 231 /* 232 * And now the final hack. We move data in the pending side i.e. 233 * head to the new socket buffer. Let the GRUBBING begin :-0 234 */ 235 sctp_pull_off_control_to_new_inp(inp, n_inp, stcb, SBL_WAIT); 236 atomic_subtract_int(&stcb->asoc.refcnt, 1); 237 return (newso); 238 }
Cache object: 58bf96dd1a04d2a933796b831b039778
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