1fb51a12f2
VNET socket push back: try to minimize the number of places where we have to switch vnets and narrow down the time we stay switched. Add assertions to the socket code to catch possibly unset vnets as seen in r204147. While this reduces the number of vnet recursion in some places like NFS, POSIX local sockets and some netgraph, .. recursions are impossible to fix. The current expectations are documented at the beginning of uipc_socket.c along with the other information there. Sponsored by: The FreeBSD Foundation Sponsored by: CK Software GmbH Reviewed by: jhb Tested by: zec Tested by: Mikolaj Golub (to.my.trociny gmail.com) MFC after: 2 weeks
245 lines
8.5 KiB
C
245 lines
8.5 KiB
C
/*-
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* Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
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* Copyright (c) 2008-2011, by Randall Stewart. All rights reserved.
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* Copyright (c) 2008-2011, by Michael Tuexen. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* a) Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* b) Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the distribution.
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*
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* c) Neither the name of Cisco Systems, Inc. nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/* $KAME: sctp_peeloff.c,v 1.13 2005/03/06 16:04:18 itojun Exp $ */
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <netinet/sctp_os.h>
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#include <netinet/sctp_pcb.h>
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#include <netinet/sctputil.h>
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#include <netinet/sctp_var.h>
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#include <netinet/sctp_var.h>
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#include <netinet/sctp_sysctl.h>
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#include <netinet/sctp.h>
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#include <netinet/sctp_uio.h>
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#include <netinet/sctp_peeloff.h>
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#include <netinet/sctputil.h>
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#include <netinet/sctp_auth.h>
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int
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sctp_can_peel_off(struct socket *head, sctp_assoc_t assoc_id)
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{
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struct sctp_inpcb *inp;
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struct sctp_tcb *stcb;
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uint32_t state;
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inp = (struct sctp_inpcb *)head->so_pcb;
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if (inp == NULL) {
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SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, EFAULT);
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return (EFAULT);
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}
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stcb = sctp_findassociation_ep_asocid(inp, assoc_id, 1);
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if (stcb == NULL) {
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SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_PEELOFF, ENOENT);
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return (ENOENT);
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}
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state = SCTP_GET_STATE((&stcb->asoc));
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if ((state == SCTP_STATE_EMPTY) ||
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(state == SCTP_STATE_INUSE) ||
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(state == SCTP_STATE_COOKIE_WAIT) ||
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(state == SCTP_STATE_COOKIE_ECHOED)) {
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SCTP_TCB_UNLOCK(stcb);
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SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_PEELOFF, ENOTCONN);
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return (ENOTCONN);
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}
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SCTP_TCB_UNLOCK(stcb);
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/* We are clear to peel this one off */
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return (0);
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}
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int
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sctp_do_peeloff(struct socket *head, struct socket *so, sctp_assoc_t assoc_id)
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{
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struct sctp_inpcb *inp, *n_inp;
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struct sctp_tcb *stcb;
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uint32_t state;
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inp = (struct sctp_inpcb *)head->so_pcb;
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if (inp == NULL) {
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SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, EFAULT);
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return (EFAULT);
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}
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stcb = sctp_findassociation_ep_asocid(inp, assoc_id, 1);
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if (stcb == NULL) {
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SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, ENOTCONN);
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return (ENOTCONN);
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}
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state = SCTP_GET_STATE((&stcb->asoc));
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if ((state == SCTP_STATE_EMPTY) ||
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(state == SCTP_STATE_INUSE) ||
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(state == SCTP_STATE_COOKIE_WAIT) ||
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(state == SCTP_STATE_COOKIE_ECHOED)) {
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SCTP_TCB_UNLOCK(stcb);
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SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, ENOTCONN);
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return (ENOTCONN);
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}
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n_inp = (struct sctp_inpcb *)so->so_pcb;
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n_inp->sctp_flags = (SCTP_PCB_FLAGS_UDPTYPE |
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SCTP_PCB_FLAGS_CONNECTED |
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SCTP_PCB_FLAGS_IN_TCPPOOL | /* Turn on Blocking IO */
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(SCTP_PCB_COPY_FLAGS & inp->sctp_flags));
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n_inp->sctp_socket = so;
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n_inp->sctp_features = inp->sctp_features;
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n_inp->sctp_mobility_features = inp->sctp_mobility_features;
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n_inp->sctp_frag_point = inp->sctp_frag_point;
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n_inp->sctp_cmt_on_off = inp->sctp_cmt_on_off;
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n_inp->sctp_ecn_enable = inp->sctp_ecn_enable;
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n_inp->partial_delivery_point = inp->partial_delivery_point;
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n_inp->sctp_context = inp->sctp_context;
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n_inp->inp_starting_point_for_iterator = NULL;
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/* copy in the authentication parameters from the original endpoint */
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if (n_inp->sctp_ep.local_hmacs)
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sctp_free_hmaclist(n_inp->sctp_ep.local_hmacs);
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n_inp->sctp_ep.local_hmacs =
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sctp_copy_hmaclist(inp->sctp_ep.local_hmacs);
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if (n_inp->sctp_ep.local_auth_chunks)
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sctp_free_chunklist(n_inp->sctp_ep.local_auth_chunks);
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n_inp->sctp_ep.local_auth_chunks =
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sctp_copy_chunklist(inp->sctp_ep.local_auth_chunks);
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(void)sctp_copy_skeylist(&inp->sctp_ep.shared_keys,
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&n_inp->sctp_ep.shared_keys);
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/*
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* Now we must move it from one hash table to another and get the
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* stcb in the right place.
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*/
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sctp_move_pcb_and_assoc(inp, n_inp, stcb);
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atomic_add_int(&stcb->asoc.refcnt, 1);
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SCTP_TCB_UNLOCK(stcb);
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sctp_pull_off_control_to_new_inp(inp, n_inp, stcb, SBL_WAIT);
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atomic_subtract_int(&stcb->asoc.refcnt, 1);
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return (0);
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}
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struct socket *
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sctp_get_peeloff(struct socket *head, sctp_assoc_t assoc_id, int *error)
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{
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struct socket *newso;
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struct sctp_inpcb *inp, *n_inp;
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struct sctp_tcb *stcb;
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SCTPDBG(SCTP_DEBUG_PEEL1, "SCTP peel-off called\n");
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inp = (struct sctp_inpcb *)head->so_pcb;
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if (inp == NULL) {
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SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, EFAULT);
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*error = EFAULT;
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return (NULL);
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}
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stcb = sctp_findassociation_ep_asocid(inp, assoc_id, 1);
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if (stcb == NULL) {
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SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, ENOTCONN);
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*error = ENOTCONN;
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return (NULL);
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}
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atomic_add_int(&stcb->asoc.refcnt, 1);
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SCTP_TCB_UNLOCK(stcb);
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CURVNET_SET(head->so_vnet);
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newso = sonewconn(head, SS_ISCONNECTED
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);
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CURVNET_RESTORE();
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if (newso == NULL) {
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SCTPDBG(SCTP_DEBUG_PEEL1, "sctp_peeloff:sonewconn failed\n");
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SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_PEELOFF, ENOMEM);
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*error = ENOMEM;
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atomic_subtract_int(&stcb->asoc.refcnt, 1);
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return (NULL);
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}
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SCTP_TCB_LOCK(stcb);
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atomic_subtract_int(&stcb->asoc.refcnt, 1);
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n_inp = (struct sctp_inpcb *)newso->so_pcb;
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SOCK_LOCK(head);
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n_inp->sctp_flags = (SCTP_PCB_FLAGS_UDPTYPE |
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SCTP_PCB_FLAGS_CONNECTED |
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SCTP_PCB_FLAGS_IN_TCPPOOL | /* Turn on Blocking IO */
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(SCTP_PCB_COPY_FLAGS & inp->sctp_flags));
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n_inp->sctp_features = inp->sctp_features;
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n_inp->sctp_frag_point = inp->sctp_frag_point;
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n_inp->sctp_cmt_on_off = inp->sctp_cmt_on_off;
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n_inp->sctp_ecn_enable = inp->sctp_ecn_enable;
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n_inp->partial_delivery_point = inp->partial_delivery_point;
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n_inp->sctp_context = inp->sctp_context;
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n_inp->inp_starting_point_for_iterator = NULL;
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/* copy in the authentication parameters from the original endpoint */
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if (n_inp->sctp_ep.local_hmacs)
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sctp_free_hmaclist(n_inp->sctp_ep.local_hmacs);
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n_inp->sctp_ep.local_hmacs =
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sctp_copy_hmaclist(inp->sctp_ep.local_hmacs);
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if (n_inp->sctp_ep.local_auth_chunks)
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sctp_free_chunklist(n_inp->sctp_ep.local_auth_chunks);
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n_inp->sctp_ep.local_auth_chunks =
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sctp_copy_chunklist(inp->sctp_ep.local_auth_chunks);
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(void)sctp_copy_skeylist(&inp->sctp_ep.shared_keys,
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&n_inp->sctp_ep.shared_keys);
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n_inp->sctp_socket = newso;
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if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
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sctp_feature_off(n_inp, SCTP_PCB_FLAGS_AUTOCLOSE);
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n_inp->sctp_ep.auto_close_time = 0;
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sctp_timer_stop(SCTP_TIMER_TYPE_AUTOCLOSE, n_inp, stcb, NULL,
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SCTP_FROM_SCTP_PEELOFF + SCTP_LOC_1);
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}
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/* Turn off any non-blocking semantic. */
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SCTP_CLEAR_SO_NBIO(newso);
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newso->so_state |= SS_ISCONNECTED;
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/* We remove it right away */
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#ifdef SCTP_LOCK_LOGGING
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if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOCK_LOGGING_ENABLE) {
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sctp_log_lock(inp, (struct sctp_tcb *)NULL, SCTP_LOG_LOCK_SOCK);
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}
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#endif
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TAILQ_REMOVE(&head->so_comp, newso, so_list);
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head->so_qlen--;
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SOCK_UNLOCK(head);
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/*
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* Now we must move it from one hash table to another and get the
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* stcb in the right place.
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*/
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sctp_move_pcb_and_assoc(inp, n_inp, stcb);
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atomic_add_int(&stcb->asoc.refcnt, 1);
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SCTP_TCB_UNLOCK(stcb);
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/*
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* And now the final hack. We move data in the pending side i.e.
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* head to the new socket buffer. Let the GRUBBING begin :-0
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*/
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sctp_pull_off_control_to_new_inp(inp, n_inp, stcb, SBL_WAIT);
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atomic_subtract_int(&stcb->asoc.refcnt, 1);
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return (newso);
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}
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