1 |
1275 |
phoenix |
/* SCTP kernel reference Implementation
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2 |
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* (C) Copyright IBM Corp. 2001, 2003
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3 |
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* Copyright (c) 1999-2000 Cisco, Inc.
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4 |
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* Copyright (c) 1999-2001 Motorola, Inc.
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5 |
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* Copyright (c) 2001 Intel Corp.
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6 |
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* Copyright (c) 2001 La Monte H.P. Yarroll
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7 |
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*
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8 |
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* This file is part of the SCTP kernel reference Implementation
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9 |
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*
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10 |
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* This module provides the abstraction for an SCTP association.
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11 |
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*
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12 |
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* The SCTP reference implementation is free software;
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13 |
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* you can redistribute it and/or modify it under the terms of
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* the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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16 |
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* any later version.
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*
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18 |
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* The SCTP reference implementation is distributed in the hope that it
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19 |
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* will be useful, but WITHOUT ANY WARRANTY; without even the implied
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20 |
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* ************************
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21 |
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* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details.
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*
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24 |
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* You should have received a copy of the GNU General Public License
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25 |
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* along with GNU CC; see the file COPYING. If not, write to
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* the Free Software Foundation, 59 Temple Place - Suite 330,
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27 |
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* Boston, MA 02111-1307, USA.
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28 |
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*
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29 |
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* Please send any bug reports or fixes you make to the
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30 |
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* email address(es):
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31 |
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* lksctp developers <lksctp-developers@lists.sourceforge.net>
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*
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33 |
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* Or submit a bug report through the following website:
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* http://www.sf.net/projects/lksctp
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*
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* Written or modified by:
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37 |
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* La Monte H.P. Yarroll <piggy@acm.org>
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38 |
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* Karl Knutson <karl@athena.chicago.il.us>
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39 |
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* Jon Grimm <jgrimm@us.ibm.com>
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40 |
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* Xingang Guo <xingang.guo@intel.com>
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41 |
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* Hui Huang <hui.huang@nokia.com>
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42 |
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* Sridhar Samudrala <sri@us.ibm.com>
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43 |
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* Daisy Chang <daisyc@us.ibm.com>
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44 |
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* Ryan Layer <rmlayer@us.ibm.com>
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45 |
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* Kevin Gao <kevin.gao@intel.com>
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46 |
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*
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47 |
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* Any bugs reported given to us we will try to fix... any fixes shared will
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48 |
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* be incorporated into the next SCTP release.
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49 |
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*/
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50 |
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51 |
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#include <linux/types.h>
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52 |
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#include <linux/fcntl.h>
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53 |
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#include <linux/poll.h>
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54 |
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#include <linux/init.h>
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55 |
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#include <linux/sched.h>
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56 |
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57 |
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#include <linux/slab.h>
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58 |
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#include <linux/in.h>
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59 |
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#include <net/ipv6.h>
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60 |
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#include <net/sctp/sctp.h>
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61 |
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#include <net/sctp/sm.h>
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62 |
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63 |
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/* Forward declarations for internal functions. */
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64 |
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static void sctp_assoc_bh_rcv(struct sctp_association *asoc);
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65 |
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66 |
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67 |
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/* 1st Level Abstractions. */
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68 |
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|
69 |
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/* Allocate and initialize a new association */
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70 |
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struct sctp_association *sctp_association_new(const struct sctp_endpoint *ep,
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71 |
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const struct sock *sk,
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72 |
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sctp_scope_t scope, int gfp)
|
73 |
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{
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74 |
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struct sctp_association *asoc;
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75 |
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76 |
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asoc = t_new(struct sctp_association, gfp);
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77 |
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if (!asoc)
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78 |
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goto fail;
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79 |
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|
80 |
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if (!sctp_association_init(asoc, ep, sk, scope, gfp))
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81 |
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goto fail_init;
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82 |
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83 |
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asoc->base.malloced = 1;
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84 |
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SCTP_DBG_OBJCNT_INC(assoc);
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85 |
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86 |
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return asoc;
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87 |
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|
88 |
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fail_init:
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89 |
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kfree(asoc);
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90 |
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fail:
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91 |
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return NULL;
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92 |
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}
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93 |
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|
94 |
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/* Initialize a new association from provided memory. */
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95 |
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struct sctp_association *sctp_association_init(struct sctp_association *asoc,
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96 |
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const struct sctp_endpoint *ep,
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97 |
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const struct sock *sk,
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98 |
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sctp_scope_t scope,
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99 |
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int gfp)
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100 |
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{
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101 |
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struct sctp_opt *sp;
|
102 |
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int i;
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103 |
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104 |
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/* Retrieve the SCTP per socket area. */
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105 |
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sp = sctp_sk((struct sock *)sk);
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106 |
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107 |
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/* Init all variables to a known value. */
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108 |
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memset(asoc, 0, sizeof(struct sctp_association));
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109 |
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110 |
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/* Discarding const is appropriate here. */
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111 |
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asoc->ep = (struct sctp_endpoint *)ep;
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112 |
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sctp_endpoint_hold(asoc->ep);
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113 |
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114 |
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/* Hold the sock. */
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115 |
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asoc->base.sk = (struct sock *)sk;
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116 |
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sock_hold(asoc->base.sk);
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117 |
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118 |
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/* Initialize the common base substructure. */
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119 |
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asoc->base.type = SCTP_EP_TYPE_ASSOCIATION;
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120 |
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121 |
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/* Initialize the object handling fields. */
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122 |
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atomic_set(&asoc->base.refcnt, 1);
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123 |
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asoc->base.dead = 0;
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124 |
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asoc->base.malloced = 0;
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125 |
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126 |
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/* Initialize the bind addr area. */
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127 |
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sctp_bind_addr_init(&asoc->base.bind_addr, ep->base.bind_addr.port);
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128 |
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asoc->base.addr_lock = RW_LOCK_UNLOCKED;
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129 |
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130 |
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asoc->state = SCTP_STATE_CLOSED;
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131 |
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132 |
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/* Set these values from the socket values, a conversion between
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133 |
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* millsecons to seconds/microseconds must also be done.
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134 |
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*/
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135 |
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asoc->cookie_life.tv_sec = sp->assocparams.sasoc_cookie_life / 1000;
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136 |
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asoc->cookie_life.tv_usec = (sp->assocparams.sasoc_cookie_life % 1000)
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137 |
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* 1000;
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138 |
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asoc->pmtu = 0;
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139 |
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asoc->frag_point = 0;
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140 |
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|
141 |
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/* Set the association max_retrans and RTO values from the
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142 |
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* socket values.
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143 |
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*/
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144 |
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asoc->max_retrans = sp->assocparams.sasoc_asocmaxrxt;
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145 |
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asoc->rto_initial = SCTP_MSECS_TO_JIFFIES(sp->rtoinfo.srto_initial);
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146 |
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asoc->rto_max = SCTP_MSECS_TO_JIFFIES(sp->rtoinfo.srto_max);
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147 |
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asoc->rto_min = SCTP_MSECS_TO_JIFFIES(sp->rtoinfo.srto_min);
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148 |
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149 |
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asoc->overall_error_count = 0;
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150 |
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151 |
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/* Initialize the maximum mumber of new data packets that can be sent
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152 |
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* in a burst.
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153 |
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*/
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154 |
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asoc->max_burst = sctp_max_burst;
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155 |
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156 |
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/* Copy things from the endpoint. */
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157 |
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for (i = SCTP_EVENT_TIMEOUT_NONE; i < SCTP_NUM_TIMEOUT_TYPES; ++i) {
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158 |
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asoc->timeouts[i] = ep->timeouts[i];
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159 |
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init_timer(&asoc->timers[i]);
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160 |
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asoc->timers[i].function = sctp_timer_events[i];
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161 |
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asoc->timers[i].data = (unsigned long) asoc;
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162 |
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}
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163 |
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|
164 |
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/* Pull default initialization values from the sock options.
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165 |
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* Note: This assumes that the values have already been
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166 |
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* validated in the sock.
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167 |
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*/
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168 |
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asoc->c.sinit_max_instreams = sp->initmsg.sinit_max_instreams;
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169 |
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asoc->c.sinit_num_ostreams = sp->initmsg.sinit_num_ostreams;
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170 |
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asoc->max_init_attempts = sp->initmsg.sinit_max_attempts;
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171 |
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|
172 |
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asoc->max_init_timeo =
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173 |
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SCTP_MSECS_TO_JIFFIES(sp->initmsg.sinit_max_init_timeo);
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174 |
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|
175 |
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/* Allocate storage for the ssnmap after the inbound and outbound
|
176 |
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* streams have been negotiated during Init.
|
177 |
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*/
|
178 |
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asoc->ssnmap = NULL;
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179 |
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|
180 |
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/* Set the local window size for receive.
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181 |
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* This is also the rcvbuf space per association.
|
182 |
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* RFC 6 - A SCTP receiver MUST be able to receive a minimum of
|
183 |
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* 1500 bytes in one SCTP packet.
|
184 |
|
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*/
|
185 |
|
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if (sk->sk_rcvbuf < SCTP_DEFAULT_MINWINDOW)
|
186 |
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asoc->rwnd = SCTP_DEFAULT_MINWINDOW;
|
187 |
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else
|
188 |
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asoc->rwnd = sk->sk_rcvbuf;
|
189 |
|
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|
190 |
|
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asoc->a_rwnd = asoc->rwnd;
|
191 |
|
|
|
192 |
|
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asoc->rwnd_over = 0;
|
193 |
|
|
|
194 |
|
|
/* Use my own max window until I learn something better. */
|
195 |
|
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asoc->peer.rwnd = SCTP_DEFAULT_MAXWINDOW;
|
196 |
|
|
|
197 |
|
|
/* Set the sndbuf size for transmit. */
|
198 |
|
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asoc->sndbuf_used = 0;
|
199 |
|
|
|
200 |
|
|
init_waitqueue_head(&asoc->wait);
|
201 |
|
|
|
202 |
|
|
asoc->c.my_vtag = sctp_generate_tag(ep);
|
203 |
|
|
asoc->peer.i.init_tag = 0; /* INIT needs a vtag of 0. */
|
204 |
|
|
asoc->c.peer_vtag = 0;
|
205 |
|
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asoc->c.my_ttag = 0;
|
206 |
|
|
asoc->c.peer_ttag = 0;
|
207 |
|
|
|
208 |
|
|
asoc->c.initial_tsn = sctp_generate_tsn(ep);
|
209 |
|
|
|
210 |
|
|
asoc->next_tsn = asoc->c.initial_tsn;
|
211 |
|
|
|
212 |
|
|
asoc->ctsn_ack_point = asoc->next_tsn - 1;
|
213 |
|
|
asoc->highest_sacked = asoc->ctsn_ack_point;
|
214 |
|
|
asoc->last_cwr_tsn = asoc->ctsn_ack_point;
|
215 |
|
|
asoc->unack_data = 0;
|
216 |
|
|
|
217 |
|
|
SCTP_DEBUG_PRINTK("myctsnap for %s INIT as 0x%x.\n",
|
218 |
|
|
asoc->ep->debug_name,
|
219 |
|
|
asoc->ctsn_ack_point);
|
220 |
|
|
|
221 |
|
|
/* ADDIP Section 4.1 Asconf Chunk Procedures
|
222 |
|
|
*
|
223 |
|
|
* When an endpoint has an ASCONF signaled change to be sent to the
|
224 |
|
|
* remote endpoint it should do the following:
|
225 |
|
|
* ...
|
226 |
|
|
* A2) a serial number should be assigned to the chunk. The serial
|
227 |
|
|
* number SHOULD be a monotonically increasing number. The serial
|
228 |
|
|
* numbers SHOULD be initialized at the start of the
|
229 |
|
|
* association to the same value as the initial TSN.
|
230 |
|
|
*/
|
231 |
|
|
asoc->addip_serial = asoc->c.initial_tsn;
|
232 |
|
|
|
233 |
|
|
skb_queue_head_init(&asoc->addip_chunks);
|
234 |
|
|
|
235 |
|
|
/* Make an empty list of remote transport addresses. */
|
236 |
|
|
INIT_LIST_HEAD(&asoc->peer.transport_addr_list);
|
237 |
|
|
|
238 |
|
|
/* RFC 2960 5.1 Normal Establishment of an Association
|
239 |
|
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*
|
240 |
|
|
* After the reception of the first data chunk in an
|
241 |
|
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* association the endpoint must immediately respond with a
|
242 |
|
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* sack to acknowledge the data chunk. Subsequent
|
243 |
|
|
* acknowledgements should be done as described in Section
|
244 |
|
|
* 6.2.
|
245 |
|
|
*
|
246 |
|
|
* [We implement this by telling a new association that it
|
247 |
|
|
* already received one packet.]
|
248 |
|
|
*/
|
249 |
|
|
asoc->peer.sack_needed = 1;
|
250 |
|
|
|
251 |
|
|
/* Assume that the peer recongizes ASCONF until reported otherwise
|
252 |
|
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* via an ERROR chunk.
|
253 |
|
|
*/
|
254 |
|
|
asoc->peer.asconf_capable = 1;
|
255 |
|
|
|
256 |
|
|
/* Create an input queue. */
|
257 |
|
|
sctp_inq_init(&asoc->base.inqueue);
|
258 |
|
|
sctp_inq_set_th_handler(&asoc->base.inqueue,
|
259 |
|
|
(void (*)(void *))sctp_assoc_bh_rcv,
|
260 |
|
|
asoc);
|
261 |
|
|
|
262 |
|
|
/* Create an output queue. */
|
263 |
|
|
sctp_outq_init(asoc, &asoc->outqueue);
|
264 |
|
|
sctp_outq_set_output_handlers(&asoc->outqueue,
|
265 |
|
|
sctp_packet_init,
|
266 |
|
|
sctp_packet_config,
|
267 |
|
|
sctp_packet_append_chunk,
|
268 |
|
|
sctp_packet_transmit_chunk,
|
269 |
|
|
sctp_packet_transmit);
|
270 |
|
|
|
271 |
|
|
if (!sctp_ulpq_init(&asoc->ulpq, asoc))
|
272 |
|
|
goto fail_init;
|
273 |
|
|
|
274 |
|
|
/* Set up the tsn tracking. */
|
275 |
|
|
sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_SIZE, 0);
|
276 |
|
|
|
277 |
|
|
asoc->need_ecne = 0;
|
278 |
|
|
|
279 |
|
|
asoc->eyecatcher = SCTP_ASSOC_EYECATCHER;
|
280 |
|
|
|
281 |
|
|
/* Assume that peer would support both address types unless we are
|
282 |
|
|
* told otherwise.
|
283 |
|
|
*/
|
284 |
|
|
asoc->peer.ipv4_address = 1;
|
285 |
|
|
asoc->peer.ipv6_address = 1;
|
286 |
|
|
INIT_LIST_HEAD(&asoc->asocs);
|
287 |
|
|
|
288 |
|
|
asoc->autoclose = sp->autoclose;
|
289 |
|
|
|
290 |
|
|
asoc->default_stream = sp->default_stream;
|
291 |
|
|
asoc->default_ppid = sp->default_ppid;
|
292 |
|
|
asoc->default_flags = sp->default_flags;
|
293 |
|
|
asoc->default_context = sp->default_context;
|
294 |
|
|
asoc->default_timetolive = sp->default_timetolive;
|
295 |
|
|
|
296 |
|
|
return asoc;
|
297 |
|
|
|
298 |
|
|
fail_init:
|
299 |
|
|
sctp_endpoint_put(asoc->ep);
|
300 |
|
|
sock_put(asoc->base.sk);
|
301 |
|
|
return NULL;
|
302 |
|
|
}
|
303 |
|
|
|
304 |
|
|
/* Free this association if possible. There may still be users, so
|
305 |
|
|
* the actual deallocation may be delayed.
|
306 |
|
|
*/
|
307 |
|
|
void sctp_association_free(struct sctp_association *asoc)
|
308 |
|
|
{
|
309 |
|
|
struct sock *sk = asoc->base.sk;
|
310 |
|
|
struct sctp_transport *transport;
|
311 |
|
|
struct list_head *pos, *temp;
|
312 |
|
|
int i;
|
313 |
|
|
|
314 |
|
|
list_del(&asoc->asocs);
|
315 |
|
|
|
316 |
|
|
/* Decrement the backlog value for a TCP-style listening socket. */
|
317 |
|
|
if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
|
318 |
|
|
sk->sk_ack_backlog--;
|
319 |
|
|
|
320 |
|
|
/* Mark as dead, so other users can know this structure is
|
321 |
|
|
* going away.
|
322 |
|
|
*/
|
323 |
|
|
asoc->base.dead = 1;
|
324 |
|
|
|
325 |
|
|
/* Dispose of any data lying around in the outqueue. */
|
326 |
|
|
sctp_outq_free(&asoc->outqueue);
|
327 |
|
|
|
328 |
|
|
/* Dispose of any pending messages for the upper layer. */
|
329 |
|
|
sctp_ulpq_free(&asoc->ulpq);
|
330 |
|
|
|
331 |
|
|
/* Dispose of any pending chunks on the inqueue. */
|
332 |
|
|
sctp_inq_free(&asoc->base.inqueue);
|
333 |
|
|
|
334 |
|
|
/* Free ssnmap storage. */
|
335 |
|
|
sctp_ssnmap_free(asoc->ssnmap);
|
336 |
|
|
|
337 |
|
|
/* Clean up the bound address list. */
|
338 |
|
|
sctp_bind_addr_free(&asoc->base.bind_addr);
|
339 |
|
|
|
340 |
|
|
/* Do we need to go through all of our timers and
|
341 |
|
|
* delete them? To be safe we will try to delete all, but we
|
342 |
|
|
* should be able to go through and make a guess based
|
343 |
|
|
* on our state.
|
344 |
|
|
*/
|
345 |
|
|
for (i = SCTP_EVENT_TIMEOUT_NONE; i < SCTP_NUM_TIMEOUT_TYPES; ++i) {
|
346 |
|
|
if (timer_pending(&asoc->timers[i]) &&
|
347 |
|
|
del_timer(&asoc->timers[i]))
|
348 |
|
|
sctp_association_put(asoc);
|
349 |
|
|
}
|
350 |
|
|
|
351 |
|
|
/* Free peer's cached cookie. */
|
352 |
|
|
if (asoc->peer.cookie) {
|
353 |
|
|
kfree(asoc->peer.cookie);
|
354 |
|
|
}
|
355 |
|
|
|
356 |
|
|
/* Release the transport structures. */
|
357 |
|
|
list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
|
358 |
|
|
transport = list_entry(pos, struct sctp_transport, transports);
|
359 |
|
|
list_del(pos);
|
360 |
|
|
sctp_transport_free(transport);
|
361 |
|
|
}
|
362 |
|
|
|
363 |
|
|
asoc->eyecatcher = 0;
|
364 |
|
|
|
365 |
|
|
/* Free any cached ASCONF_ACK chunk. */
|
366 |
|
|
if (asoc->addip_last_asconf_ack)
|
367 |
|
|
sctp_chunk_free(asoc->addip_last_asconf_ack);
|
368 |
|
|
|
369 |
|
|
/* Free any cached ASCONF chunk. */
|
370 |
|
|
if (asoc->addip_last_asconf)
|
371 |
|
|
sctp_chunk_free(asoc->addip_last_asconf);
|
372 |
|
|
|
373 |
|
|
sctp_association_put(asoc);
|
374 |
|
|
}
|
375 |
|
|
|
376 |
|
|
/* Cleanup and free up an association. */
|
377 |
|
|
static void sctp_association_destroy(struct sctp_association *asoc)
|
378 |
|
|
{
|
379 |
|
|
SCTP_ASSERT(asoc->base.dead, "Assoc is not dead", return);
|
380 |
|
|
|
381 |
|
|
sctp_endpoint_put(asoc->ep);
|
382 |
|
|
sock_put(asoc->base.sk);
|
383 |
|
|
|
384 |
|
|
if (asoc->base.malloced) {
|
385 |
|
|
kfree(asoc);
|
386 |
|
|
SCTP_DBG_OBJCNT_DEC(assoc);
|
387 |
|
|
}
|
388 |
|
|
}
|
389 |
|
|
|
390 |
|
|
/* Change the primary destination address for the peer. */
|
391 |
|
|
void sctp_assoc_set_primary(struct sctp_association *asoc,
|
392 |
|
|
struct sctp_transport *transport)
|
393 |
|
|
{
|
394 |
|
|
asoc->peer.primary_path = transport;
|
395 |
|
|
|
396 |
|
|
/* Set a default msg_name for events. */
|
397 |
|
|
memcpy(&asoc->peer.primary_addr, &transport->ipaddr,
|
398 |
|
|
sizeof(union sctp_addr));
|
399 |
|
|
|
400 |
|
|
/* If the primary path is changing, assume that the
|
401 |
|
|
* user wants to use this new path.
|
402 |
|
|
*/
|
403 |
|
|
if (transport->active)
|
404 |
|
|
asoc->peer.active_path = transport;
|
405 |
|
|
|
406 |
|
|
/*
|
407 |
|
|
* SFR-CACC algorithm:
|
408 |
|
|
* Upon the receipt of a request to change the primary
|
409 |
|
|
* destination address, on the data structure for the new
|
410 |
|
|
* primary destination, the sender MUST do the following:
|
411 |
|
|
*
|
412 |
|
|
* 1) If CHANGEOVER_ACTIVE is set, then there was a switch
|
413 |
|
|
* to this destination address earlier. The sender MUST set
|
414 |
|
|
* CYCLING_CHANGEOVER to indicate that this switch is a
|
415 |
|
|
* double switch to the same destination address.
|
416 |
|
|
*/
|
417 |
|
|
if (transport->cacc.changeover_active)
|
418 |
|
|
transport->cacc.cycling_changeover = 1;
|
419 |
|
|
|
420 |
|
|
/* 2) The sender MUST set CHANGEOVER_ACTIVE to indicate that
|
421 |
|
|
* a changeover has occurred.
|
422 |
|
|
*/
|
423 |
|
|
transport->cacc.changeover_active = 1;
|
424 |
|
|
|
425 |
|
|
/* 3) The sender MUST store the next TSN to be sent in
|
426 |
|
|
* next_tsn_at_change.
|
427 |
|
|
*/
|
428 |
|
|
transport->cacc.next_tsn_at_change = asoc->next_tsn;
|
429 |
|
|
}
|
430 |
|
|
|
431 |
|
|
/* Add a transport address to an association. */
|
432 |
|
|
struct sctp_transport *sctp_assoc_add_peer(struct sctp_association *asoc,
|
433 |
|
|
const union sctp_addr *addr,
|
434 |
|
|
int gfp)
|
435 |
|
|
{
|
436 |
|
|
struct sctp_transport *peer;
|
437 |
|
|
struct sctp_opt *sp;
|
438 |
|
|
unsigned short port;
|
439 |
|
|
|
440 |
|
|
sp = sctp_sk(asoc->base.sk);
|
441 |
|
|
|
442 |
|
|
/* AF_INET and AF_INET6 share common port field. */
|
443 |
|
|
port = addr->v4.sin_port;
|
444 |
|
|
|
445 |
|
|
/* Set the port if it has not been set yet. */
|
446 |
|
|
if (0 == asoc->peer.port)
|
447 |
|
|
asoc->peer.port = port;
|
448 |
|
|
|
449 |
|
|
/* Check to see if this is a duplicate. */
|
450 |
|
|
peer = sctp_assoc_lookup_paddr(asoc, addr);
|
451 |
|
|
if (peer)
|
452 |
|
|
return peer;
|
453 |
|
|
|
454 |
|
|
peer = sctp_transport_new(addr, gfp);
|
455 |
|
|
if (!peer)
|
456 |
|
|
return NULL;
|
457 |
|
|
|
458 |
|
|
sctp_transport_set_owner(peer, asoc);
|
459 |
|
|
|
460 |
|
|
/* Initialize the pmtu of the transport. */
|
461 |
|
|
sctp_transport_pmtu(peer);
|
462 |
|
|
|
463 |
|
|
/* If this is the first transport addr on this association,
|
464 |
|
|
* initialize the association PMTU to the peer's PMTU.
|
465 |
|
|
* If not and the current association PMTU is higher than the new
|
466 |
|
|
* peer's PMTU, reset the association PMTU to the new peer's PMTU.
|
467 |
|
|
*/
|
468 |
|
|
if (asoc->pmtu)
|
469 |
|
|
asoc->pmtu = min_t(int, peer->pmtu, asoc->pmtu);
|
470 |
|
|
else
|
471 |
|
|
asoc->pmtu = peer->pmtu;
|
472 |
|
|
|
473 |
|
|
SCTP_DEBUG_PRINTK("sctp_assoc_add_peer:association %p PMTU set to "
|
474 |
|
|
"%d\n", asoc, asoc->pmtu);
|
475 |
|
|
|
476 |
|
|
asoc->frag_point = sctp_frag_point(sp, asoc->pmtu);
|
477 |
|
|
|
478 |
|
|
/* The asoc->peer.port might not be meaningful yet, but
|
479 |
|
|
* initialize the packet structure anyway.
|
480 |
|
|
*/
|
481 |
|
|
(asoc->outqueue.init_output)(&peer->packet,
|
482 |
|
|
peer,
|
483 |
|
|
asoc->base.bind_addr.port,
|
484 |
|
|
asoc->peer.port);
|
485 |
|
|
|
486 |
|
|
/* 7.2.1 Slow-Start
|
487 |
|
|
*
|
488 |
|
|
* o The initial cwnd before data transmission or after a
|
489 |
|
|
* sufficiently long idle period MUST be <= 2*MTU.
|
490 |
|
|
*
|
491 |
|
|
* o The initial value of ssthresh MAY be arbitrarily high
|
492 |
|
|
* (for example, implementations MAY use the size of the
|
493 |
|
|
* receiver advertised window).
|
494 |
|
|
*/
|
495 |
|
|
peer->cwnd = asoc->pmtu * 2;
|
496 |
|
|
|
497 |
|
|
/* At this point, we may not have the receiver's advertised window,
|
498 |
|
|
* so initialize ssthresh to the default value and it will be set
|
499 |
|
|
* later when we process the INIT.
|
500 |
|
|
*/
|
501 |
|
|
peer->ssthresh = SCTP_DEFAULT_MAXWINDOW;
|
502 |
|
|
|
503 |
|
|
peer->partial_bytes_acked = 0;
|
504 |
|
|
peer->flight_size = 0;
|
505 |
|
|
peer->error_threshold = peer->max_retrans;
|
506 |
|
|
|
507 |
|
|
/* By default, enable heartbeat for peer address. */
|
508 |
|
|
peer->hb_allowed = 1;
|
509 |
|
|
|
510 |
|
|
/* Initialize the peer's heartbeat interval based on the
|
511 |
|
|
* sock configured value.
|
512 |
|
|
*/
|
513 |
|
|
peer->hb_interval = SCTP_MSECS_TO_JIFFIES(sp->paddrparam.spp_hbinterval);
|
514 |
|
|
|
515 |
|
|
/* Set the path max_retrans. */
|
516 |
|
|
peer->max_retrans = asoc->max_retrans;
|
517 |
|
|
|
518 |
|
|
/* Set the transport's RTO.initial value */
|
519 |
|
|
peer->rto = asoc->rto_initial;
|
520 |
|
|
|
521 |
|
|
/* Attach the remote transport to our asoc. */
|
522 |
|
|
list_add_tail(&peer->transports, &asoc->peer.transport_addr_list);
|
523 |
|
|
|
524 |
|
|
/* If we do not yet have a primary path, set one. */
|
525 |
|
|
if (!asoc->peer.primary_path) {
|
526 |
|
|
sctp_assoc_set_primary(asoc, peer);
|
527 |
|
|
asoc->peer.retran_path = peer;
|
528 |
|
|
}
|
529 |
|
|
|
530 |
|
|
if (asoc->peer.active_path == asoc->peer.retran_path)
|
531 |
|
|
asoc->peer.retran_path = peer;
|
532 |
|
|
|
533 |
|
|
return peer;
|
534 |
|
|
}
|
535 |
|
|
|
536 |
|
|
/* Delete a transport address from an association. */
|
537 |
|
|
void sctp_assoc_del_peer(struct sctp_association *asoc,
|
538 |
|
|
const union sctp_addr *addr)
|
539 |
|
|
{
|
540 |
|
|
struct list_head *pos;
|
541 |
|
|
struct list_head *temp;
|
542 |
|
|
struct sctp_transport *peer = NULL;
|
543 |
|
|
struct sctp_transport *transport;
|
544 |
|
|
|
545 |
|
|
list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
|
546 |
|
|
transport = list_entry(pos, struct sctp_transport, transports);
|
547 |
|
|
if (sctp_cmp_addr_exact(addr, &transport->ipaddr)) {
|
548 |
|
|
peer = transport;
|
549 |
|
|
list_del(pos);
|
550 |
|
|
break;
|
551 |
|
|
}
|
552 |
|
|
}
|
553 |
|
|
|
554 |
|
|
/* The address we want delete is not in the association. */
|
555 |
|
|
if (!peer)
|
556 |
|
|
return;
|
557 |
|
|
|
558 |
|
|
/* Get the first transport of asoc. */
|
559 |
|
|
pos = asoc->peer.transport_addr_list.next;
|
560 |
|
|
transport = list_entry(pos, struct sctp_transport, transports);
|
561 |
|
|
|
562 |
|
|
/* Update any entries that match the peer to be deleted. */
|
563 |
|
|
if (asoc->peer.primary_path == peer)
|
564 |
|
|
sctp_assoc_set_primary(asoc, transport);
|
565 |
|
|
if (asoc->peer.active_path == peer)
|
566 |
|
|
asoc->peer.active_path = transport;
|
567 |
|
|
if (asoc->peer.retran_path == peer)
|
568 |
|
|
asoc->peer.retran_path = transport;
|
569 |
|
|
if (asoc->peer.last_data_from == peer)
|
570 |
|
|
asoc->peer.last_data_from = transport;
|
571 |
|
|
|
572 |
|
|
sctp_transport_free(peer);
|
573 |
|
|
}
|
574 |
|
|
|
575 |
|
|
/* Lookup a transport by address. */
|
576 |
|
|
struct sctp_transport *sctp_assoc_lookup_paddr(
|
577 |
|
|
const struct sctp_association *asoc,
|
578 |
|
|
const union sctp_addr *address)
|
579 |
|
|
{
|
580 |
|
|
struct sctp_transport *t;
|
581 |
|
|
struct list_head *pos;
|
582 |
|
|
|
583 |
|
|
/* Cycle through all transports searching for a peer address. */
|
584 |
|
|
|
585 |
|
|
list_for_each(pos, &asoc->peer.transport_addr_list) {
|
586 |
|
|
t = list_entry(pos, struct sctp_transport, transports);
|
587 |
|
|
if (sctp_cmp_addr_exact(address, &t->ipaddr))
|
588 |
|
|
return t;
|
589 |
|
|
}
|
590 |
|
|
|
591 |
|
|
return NULL;
|
592 |
|
|
}
|
593 |
|
|
|
594 |
|
|
/* Engage in transport control operations.
|
595 |
|
|
* Mark the transport up or down and send a notification to the user.
|
596 |
|
|
* Select and update the new active and retran paths.
|
597 |
|
|
*/
|
598 |
|
|
void sctp_assoc_control_transport(struct sctp_association *asoc,
|
599 |
|
|
struct sctp_transport *transport,
|
600 |
|
|
sctp_transport_cmd_t command,
|
601 |
|
|
sctp_sn_error_t error)
|
602 |
|
|
{
|
603 |
|
|
struct sctp_transport *t = NULL;
|
604 |
|
|
struct sctp_transport *first;
|
605 |
|
|
struct sctp_transport *second;
|
606 |
|
|
struct sctp_ulpevent *event;
|
607 |
|
|
struct list_head *pos;
|
608 |
|
|
int spc_state = 0;
|
609 |
|
|
|
610 |
|
|
/* Record the transition on the transport. */
|
611 |
|
|
switch (command) {
|
612 |
|
|
case SCTP_TRANSPORT_UP:
|
613 |
|
|
transport->active = SCTP_ACTIVE;
|
614 |
|
|
spc_state = SCTP_ADDR_REACHABLE;
|
615 |
|
|
break;
|
616 |
|
|
|
617 |
|
|
case SCTP_TRANSPORT_DOWN:
|
618 |
|
|
transport->active = SCTP_INACTIVE;
|
619 |
|
|
spc_state = SCTP_ADDR_UNREACHABLE;
|
620 |
|
|
break;
|
621 |
|
|
|
622 |
|
|
default:
|
623 |
|
|
return;
|
624 |
|
|
};
|
625 |
|
|
|
626 |
|
|
/* Generate and send a SCTP_PEER_ADDR_CHANGE notification to the
|
627 |
|
|
* user.
|
628 |
|
|
*/
|
629 |
|
|
event = sctp_ulpevent_make_peer_addr_change(asoc,
|
630 |
|
|
(struct sockaddr_storage *) &transport->ipaddr,
|
631 |
|
|
0, spc_state, error, GFP_ATOMIC);
|
632 |
|
|
if (event)
|
633 |
|
|
sctp_ulpq_tail_event(&asoc->ulpq, event);
|
634 |
|
|
|
635 |
|
|
/* Select new active and retran paths. */
|
636 |
|
|
|
637 |
|
|
/* Look for the two most recently used active transports.
|
638 |
|
|
*
|
639 |
|
|
* This code produces the wrong ordering whenever jiffies
|
640 |
|
|
* rolls over, but we still get usable transports, so we don't
|
641 |
|
|
* worry about it.
|
642 |
|
|
*/
|
643 |
|
|
first = NULL; second = NULL;
|
644 |
|
|
|
645 |
|
|
list_for_each(pos, &asoc->peer.transport_addr_list) {
|
646 |
|
|
t = list_entry(pos, struct sctp_transport, transports);
|
647 |
|
|
|
648 |
|
|
if (!t->active)
|
649 |
|
|
continue;
|
650 |
|
|
if (!first || t->last_time_heard > first->last_time_heard) {
|
651 |
|
|
second = first;
|
652 |
|
|
first = t;
|
653 |
|
|
}
|
654 |
|
|
if (!second || t->last_time_heard > second->last_time_heard)
|
655 |
|
|
second = t;
|
656 |
|
|
}
|
657 |
|
|
|
658 |
|
|
/* RFC 2960 6.4 Multi-Homed SCTP Endpoints
|
659 |
|
|
*
|
660 |
|
|
* By default, an endpoint should always transmit to the
|
661 |
|
|
* primary path, unless the SCTP user explicitly specifies the
|
662 |
|
|
* destination transport address (and possibly source
|
663 |
|
|
* transport address) to use.
|
664 |
|
|
*
|
665 |
|
|
* [If the primary is active but not most recent, bump the most
|
666 |
|
|
* recently used transport.]
|
667 |
|
|
*/
|
668 |
|
|
if (asoc->peer.primary_path->active &&
|
669 |
|
|
first != asoc->peer.primary_path) {
|
670 |
|
|
second = first;
|
671 |
|
|
first = asoc->peer.primary_path;
|
672 |
|
|
}
|
673 |
|
|
|
674 |
|
|
/* If we failed to find a usable transport, just camp on the
|
675 |
|
|
* primary, even if it is inactive.
|
676 |
|
|
*/
|
677 |
|
|
if (!first) {
|
678 |
|
|
first = asoc->peer.primary_path;
|
679 |
|
|
second = asoc->peer.primary_path;
|
680 |
|
|
}
|
681 |
|
|
|
682 |
|
|
/* Set the active and retran transports. */
|
683 |
|
|
asoc->peer.active_path = first;
|
684 |
|
|
asoc->peer.retran_path = second;
|
685 |
|
|
}
|
686 |
|
|
|
687 |
|
|
/* Hold a reference to an association. */
|
688 |
|
|
void sctp_association_hold(struct sctp_association *asoc)
|
689 |
|
|
{
|
690 |
|
|
atomic_inc(&asoc->base.refcnt);
|
691 |
|
|
}
|
692 |
|
|
|
693 |
|
|
/* Release a reference to an association and cleanup
|
694 |
|
|
* if there are no more references.
|
695 |
|
|
*/
|
696 |
|
|
void sctp_association_put(struct sctp_association *asoc)
|
697 |
|
|
{
|
698 |
|
|
if (atomic_dec_and_test(&asoc->base.refcnt))
|
699 |
|
|
sctp_association_destroy(asoc);
|
700 |
|
|
}
|
701 |
|
|
|
702 |
|
|
/* Allocate the next TSN, Transmission Sequence Number, for the given
|
703 |
|
|
* association.
|
704 |
|
|
*/
|
705 |
|
|
__u32 sctp_association_get_next_tsn(struct sctp_association *asoc)
|
706 |
|
|
{
|
707 |
|
|
/* From Section 1.6 Serial Number Arithmetic:
|
708 |
|
|
* Transmission Sequence Numbers wrap around when they reach
|
709 |
|
|
* 2**32 - 1. That is, the next TSN a DATA chunk MUST use
|
710 |
|
|
* after transmitting TSN = 2*32 - 1 is TSN = 0.
|
711 |
|
|
*/
|
712 |
|
|
__u32 retval = asoc->next_tsn;
|
713 |
|
|
asoc->next_tsn++;
|
714 |
|
|
asoc->unack_data++;
|
715 |
|
|
|
716 |
|
|
return retval;
|
717 |
|
|
}
|
718 |
|
|
|
719 |
|
|
/* Allocate 'num' TSNs by incrementing the association's TSN by num. */
|
720 |
|
|
__u32 sctp_association_get_tsn_block(struct sctp_association *asoc, int num)
|
721 |
|
|
{
|
722 |
|
|
__u32 retval = asoc->next_tsn;
|
723 |
|
|
|
724 |
|
|
asoc->next_tsn += num;
|
725 |
|
|
asoc->unack_data += num;
|
726 |
|
|
|
727 |
|
|
return retval;
|
728 |
|
|
}
|
729 |
|
|
|
730 |
|
|
|
731 |
|
|
/* Compare two addresses to see if they match. Wildcard addresses
|
732 |
|
|
* only match themselves.
|
733 |
|
|
*/
|
734 |
|
|
int sctp_cmp_addr_exact(const union sctp_addr *ss1,
|
735 |
|
|
const union sctp_addr *ss2)
|
736 |
|
|
{
|
737 |
|
|
struct sctp_af *af;
|
738 |
|
|
|
739 |
|
|
af = sctp_get_af_specific(ss1->sa.sa_family);
|
740 |
|
|
if (unlikely(!af))
|
741 |
|
|
return 0;
|
742 |
|
|
|
743 |
|
|
return af->cmp_addr(ss1, ss2);
|
744 |
|
|
}
|
745 |
|
|
|
746 |
|
|
/* Return an ecne chunk to get prepended to a packet.
|
747 |
|
|
* Note: We are sly and return a shared, prealloced chunk. FIXME:
|
748 |
|
|
* No we don't, but we could/should.
|
749 |
|
|
*/
|
750 |
|
|
struct sctp_chunk *sctp_get_ecne_prepend(struct sctp_association *asoc)
|
751 |
|
|
{
|
752 |
|
|
struct sctp_chunk *chunk;
|
753 |
|
|
|
754 |
|
|
/* Send ECNE if needed.
|
755 |
|
|
* Not being able to allocate a chunk here is not deadly.
|
756 |
|
|
*/
|
757 |
|
|
if (asoc->need_ecne)
|
758 |
|
|
chunk = sctp_make_ecne(asoc, asoc->last_ecne_tsn);
|
759 |
|
|
else
|
760 |
|
|
chunk = NULL;
|
761 |
|
|
|
762 |
|
|
return chunk;
|
763 |
|
|
}
|
764 |
|
|
|
765 |
|
|
/* Use this function for the packet prepend callback when no ECNE
|
766 |
|
|
* packet is desired (e.g. some packets don't like to be bundled).
|
767 |
|
|
*/
|
768 |
|
|
struct sctp_chunk *sctp_get_no_prepend(struct sctp_association *asoc)
|
769 |
|
|
{
|
770 |
|
|
return NULL;
|
771 |
|
|
}
|
772 |
|
|
|
773 |
|
|
/*
|
774 |
|
|
* Find which transport this TSN was sent on.
|
775 |
|
|
*/
|
776 |
|
|
struct sctp_transport *sctp_assoc_lookup_tsn(struct sctp_association *asoc,
|
777 |
|
|
__u32 tsn)
|
778 |
|
|
{
|
779 |
|
|
struct sctp_transport *active;
|
780 |
|
|
struct sctp_transport *match;
|
781 |
|
|
struct list_head *entry, *pos;
|
782 |
|
|
struct sctp_transport *transport;
|
783 |
|
|
struct sctp_chunk *chunk;
|
784 |
|
|
__u32 key = htonl(tsn);
|
785 |
|
|
|
786 |
|
|
match = NULL;
|
787 |
|
|
|
788 |
|
|
/*
|
789 |
|
|
* FIXME: In general, find a more efficient data structure for
|
790 |
|
|
* searching.
|
791 |
|
|
*/
|
792 |
|
|
|
793 |
|
|
/*
|
794 |
|
|
* The general strategy is to search each transport's transmitted
|
795 |
|
|
* list. Return which transport this TSN lives on.
|
796 |
|
|
*
|
797 |
|
|
* Let's be hopeful and check the active_path first.
|
798 |
|
|
* Another optimization would be to know if there is only one
|
799 |
|
|
* outbound path and not have to look for the TSN at all.
|
800 |
|
|
*
|
801 |
|
|
*/
|
802 |
|
|
|
803 |
|
|
active = asoc->peer.active_path;
|
804 |
|
|
|
805 |
|
|
list_for_each(entry, &active->transmitted) {
|
806 |
|
|
chunk = list_entry(entry, struct sctp_chunk, transmitted_list);
|
807 |
|
|
|
808 |
|
|
if (key == chunk->subh.data_hdr->tsn) {
|
809 |
|
|
match = active;
|
810 |
|
|
goto out;
|
811 |
|
|
}
|
812 |
|
|
}
|
813 |
|
|
|
814 |
|
|
/* If not found, go search all the other transports. */
|
815 |
|
|
list_for_each(pos, &asoc->peer.transport_addr_list) {
|
816 |
|
|
transport = list_entry(pos, struct sctp_transport, transports);
|
817 |
|
|
|
818 |
|
|
if (transport == active)
|
819 |
|
|
break;
|
820 |
|
|
list_for_each(entry, &transport->transmitted) {
|
821 |
|
|
chunk = list_entry(entry, struct sctp_chunk,
|
822 |
|
|
transmitted_list);
|
823 |
|
|
if (key == chunk->subh.data_hdr->tsn) {
|
824 |
|
|
match = transport;
|
825 |
|
|
goto out;
|
826 |
|
|
}
|
827 |
|
|
}
|
828 |
|
|
}
|
829 |
|
|
out:
|
830 |
|
|
return match;
|
831 |
|
|
}
|
832 |
|
|
|
833 |
|
|
/* Is this the association we are looking for? */
|
834 |
|
|
struct sctp_transport *sctp_assoc_is_match(struct sctp_association *asoc,
|
835 |
|
|
const union sctp_addr *laddr,
|
836 |
|
|
const union sctp_addr *paddr)
|
837 |
|
|
{
|
838 |
|
|
struct sctp_transport *transport;
|
839 |
|
|
|
840 |
|
|
sctp_read_lock(&asoc->base.addr_lock);
|
841 |
|
|
|
842 |
|
|
if ((asoc->base.bind_addr.port == laddr->v4.sin_port) &&
|
843 |
|
|
(asoc->peer.port == paddr->v4.sin_port)) {
|
844 |
|
|
transport = sctp_assoc_lookup_paddr(asoc, paddr);
|
845 |
|
|
if (!transport)
|
846 |
|
|
goto out;
|
847 |
|
|
|
848 |
|
|
if (sctp_bind_addr_match(&asoc->base.bind_addr, laddr,
|
849 |
|
|
sctp_sk(asoc->base.sk)))
|
850 |
|
|
goto out;
|
851 |
|
|
}
|
852 |
|
|
transport = NULL;
|
853 |
|
|
|
854 |
|
|
out:
|
855 |
|
|
sctp_read_unlock(&asoc->base.addr_lock);
|
856 |
|
|
return transport;
|
857 |
|
|
}
|
858 |
|
|
|
859 |
|
|
/* Is this a live association structure. */
|
860 |
|
|
int sctp_assoc_valid(struct sock *sk, struct sctp_association *asoc)
|
861 |
|
|
{
|
862 |
|
|
|
863 |
|
|
/* First, verify that this is a kernel address. */
|
864 |
|
|
if (!sctp_is_valid_kaddr((unsigned long) asoc))
|
865 |
|
|
return 0;
|
866 |
|
|
|
867 |
|
|
/* Verify that this _is_ an sctp_association
|
868 |
|
|
* data structure and if so, that the socket matches.
|
869 |
|
|
*/
|
870 |
|
|
if (SCTP_ASSOC_EYECATCHER != asoc->eyecatcher)
|
871 |
|
|
return 0;
|
872 |
|
|
if (asoc->base.sk != sk)
|
873 |
|
|
return 0;
|
874 |
|
|
|
875 |
|
|
/* The association is valid. */
|
876 |
|
|
return 1;
|
877 |
|
|
}
|
878 |
|
|
|
879 |
|
|
/* Do delayed input processing. This is scheduled by sctp_rcv(). */
|
880 |
|
|
static void sctp_assoc_bh_rcv(struct sctp_association *asoc)
|
881 |
|
|
{
|
882 |
|
|
struct sctp_endpoint *ep;
|
883 |
|
|
struct sctp_chunk *chunk;
|
884 |
|
|
struct sock *sk;
|
885 |
|
|
struct sctp_inq *inqueue;
|
886 |
|
|
int state, subtype;
|
887 |
|
|
int error = 0;
|
888 |
|
|
|
889 |
|
|
/* The association should be held so we should be safe. */
|
890 |
|
|
ep = asoc->ep;
|
891 |
|
|
sk = asoc->base.sk;
|
892 |
|
|
|
893 |
|
|
inqueue = &asoc->base.inqueue;
|
894 |
|
|
while (NULL != (chunk = sctp_inq_pop(inqueue))) {
|
895 |
|
|
state = asoc->state;
|
896 |
|
|
subtype = chunk->chunk_hdr->type;
|
897 |
|
|
|
898 |
|
|
/* Remember where the last DATA chunk came from so we
|
899 |
|
|
* know where to send the SACK.
|
900 |
|
|
*/
|
901 |
|
|
if (sctp_chunk_is_data(chunk))
|
902 |
|
|
asoc->peer.last_data_from = chunk->transport;
|
903 |
|
|
else
|
904 |
|
|
SCTP_INC_STATS(SctpInCtrlChunks);
|
905 |
|
|
|
906 |
|
|
if (chunk->transport)
|
907 |
|
|
chunk->transport->last_time_heard = jiffies;
|
908 |
|
|
|
909 |
|
|
/* Run through the state machine. */
|
910 |
|
|
error = sctp_do_sm(SCTP_EVENT_T_CHUNK, SCTP_ST_CHUNK(subtype),
|
911 |
|
|
state, ep, asoc, chunk, GFP_ATOMIC);
|
912 |
|
|
|
913 |
|
|
/* Check to see if the association is freed in response to
|
914 |
|
|
* the incoming chunk. If so, get out of the while loop.
|
915 |
|
|
*/
|
916 |
|
|
if (!sctp_assoc_valid(sk, asoc))
|
917 |
|
|
break;
|
918 |
|
|
|
919 |
|
|
/* If there is an error on chunk, discard this packet. */
|
920 |
|
|
if (error && chunk)
|
921 |
|
|
chunk->pdiscard = 1;
|
922 |
|
|
}
|
923 |
|
|
|
924 |
|
|
}
|
925 |
|
|
|
926 |
|
|
/* This routine moves an association from its old sk to a new sk. */
|
927 |
|
|
void sctp_assoc_migrate(struct sctp_association *assoc, struct sock *newsk)
|
928 |
|
|
{
|
929 |
|
|
struct sctp_opt *newsp = sctp_sk(newsk);
|
930 |
|
|
struct sock *oldsk = assoc->base.sk;
|
931 |
|
|
|
932 |
|
|
/* Delete the association from the old endpoint's list of
|
933 |
|
|
* associations.
|
934 |
|
|
*/
|
935 |
|
|
list_del_init(&assoc->asocs);
|
936 |
|
|
|
937 |
|
|
/* Decrement the backlog value for a TCP-style socket. */
|
938 |
|
|
if (sctp_style(oldsk, TCP))
|
939 |
|
|
oldsk->sk_ack_backlog--;
|
940 |
|
|
|
941 |
|
|
/* Release references to the old endpoint and the sock. */
|
942 |
|
|
sctp_endpoint_put(assoc->ep);
|
943 |
|
|
sock_put(assoc->base.sk);
|
944 |
|
|
|
945 |
|
|
/* Get a reference to the new endpoint. */
|
946 |
|
|
assoc->ep = newsp->ep;
|
947 |
|
|
sctp_endpoint_hold(assoc->ep);
|
948 |
|
|
|
949 |
|
|
/* Get a reference to the new sock. */
|
950 |
|
|
assoc->base.sk = newsk;
|
951 |
|
|
sock_hold(assoc->base.sk);
|
952 |
|
|
|
953 |
|
|
/* Add the association to the new endpoint's list of associations. */
|
954 |
|
|
sctp_endpoint_add_asoc(newsp->ep, assoc);
|
955 |
|
|
}
|
956 |
|
|
|
957 |
|
|
/* Update an association (possibly from unexpected COOKIE-ECHO processing). */
|
958 |
|
|
void sctp_assoc_update(struct sctp_association *asoc,
|
959 |
|
|
struct sctp_association *new)
|
960 |
|
|
{
|
961 |
|
|
/* Copy in new parameters of peer. */
|
962 |
|
|
asoc->c = new->c;
|
963 |
|
|
asoc->peer.rwnd = new->peer.rwnd;
|
964 |
|
|
asoc->peer.sack_needed = new->peer.sack_needed;
|
965 |
|
|
asoc->peer.i = new->peer.i;
|
966 |
|
|
sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_SIZE,
|
967 |
|
|
asoc->peer.i.initial_tsn);
|
968 |
|
|
|
969 |
|
|
/* FIXME:
|
970 |
|
|
* Do we need to copy primary_path etc?
|
971 |
|
|
*
|
972 |
|
|
* More explicitly, addresses may have been removed and
|
973 |
|
|
* this needs accounting for.
|
974 |
|
|
*/
|
975 |
|
|
|
976 |
|
|
/* If the case is A (association restart), use
|
977 |
|
|
* initial_tsn as next_tsn. If the case is B, use
|
978 |
|
|
* current next_tsn in case data sent to peer
|
979 |
|
|
* has been discarded and needs retransmission.
|
980 |
|
|
*/
|
981 |
|
|
if (sctp_state(asoc, ESTABLISHED)) {
|
982 |
|
|
|
983 |
|
|
asoc->next_tsn = new->next_tsn;
|
984 |
|
|
asoc->ctsn_ack_point = new->ctsn_ack_point;
|
985 |
|
|
|
986 |
|
|
/* Reinitialize SSN for both local streams
|
987 |
|
|
* and peer's streams.
|
988 |
|
|
*/
|
989 |
|
|
sctp_ssnmap_clear(asoc->ssnmap);
|
990 |
|
|
|
991 |
|
|
} else {
|
992 |
|
|
asoc->ctsn_ack_point = asoc->next_tsn - 1;
|
993 |
|
|
if (!asoc->ssnmap) {
|
994 |
|
|
/* Move the ssnmap. */
|
995 |
|
|
asoc->ssnmap = new->ssnmap;
|
996 |
|
|
new->ssnmap = NULL;
|
997 |
|
|
}
|
998 |
|
|
}
|
999 |
|
|
|
1000 |
|
|
}
|
1001 |
|
|
|
1002 |
|
|
/* Update the retran path for sending a retransmitted packet.
|
1003 |
|
|
* Round-robin through the active transports, else round-robin
|
1004 |
|
|
* through the inactive transports as this is the next best thing
|
1005 |
|
|
* we can try.
|
1006 |
|
|
*/
|
1007 |
|
|
void sctp_assoc_update_retran_path(struct sctp_association *asoc)
|
1008 |
|
|
{
|
1009 |
|
|
struct sctp_transport *t, *next;
|
1010 |
|
|
struct list_head *head = &asoc->peer.transport_addr_list;
|
1011 |
|
|
struct list_head *pos;
|
1012 |
|
|
|
1013 |
|
|
/* Find the next transport in a round-robin fashion. */
|
1014 |
|
|
t = asoc->peer.retran_path;
|
1015 |
|
|
pos = &t->transports;
|
1016 |
|
|
next = NULL;
|
1017 |
|
|
|
1018 |
|
|
while (1) {
|
1019 |
|
|
/* Skip the head. */
|
1020 |
|
|
if (pos->next == head)
|
1021 |
|
|
pos = head->next;
|
1022 |
|
|
else
|
1023 |
|
|
pos = pos->next;
|
1024 |
|
|
|
1025 |
|
|
t = list_entry(pos, struct sctp_transport, transports);
|
1026 |
|
|
|
1027 |
|
|
/* Try to find an active transport. */
|
1028 |
|
|
|
1029 |
|
|
if (t->active) {
|
1030 |
|
|
break;
|
1031 |
|
|
} else {
|
1032 |
|
|
/* Keep track of the next transport in case
|
1033 |
|
|
* we don't find any active transport.
|
1034 |
|
|
*/
|
1035 |
|
|
if (!next)
|
1036 |
|
|
next = t;
|
1037 |
|
|
}
|
1038 |
|
|
|
1039 |
|
|
/* We have exhausted the list, but didn't find any
|
1040 |
|
|
* other active transports. If so, use the next
|
1041 |
|
|
* transport.
|
1042 |
|
|
*/
|
1043 |
|
|
if (t == asoc->peer.retran_path) {
|
1044 |
|
|
t = next;
|
1045 |
|
|
break;
|
1046 |
|
|
}
|
1047 |
|
|
}
|
1048 |
|
|
|
1049 |
|
|
asoc->peer.retran_path = t;
|
1050 |
|
|
}
|
1051 |
|
|
|
1052 |
|
|
/* Choose the transport for sending a SHUTDOWN packet. */
|
1053 |
|
|
struct sctp_transport *sctp_assoc_choose_shutdown_transport(
|
1054 |
|
|
struct sctp_association *asoc)
|
1055 |
|
|
{
|
1056 |
|
|
/* If this is the first time SHUTDOWN is sent, use the active path,
|
1057 |
|
|
* else use the retran path. If the last SHUTDOWN was sent over the
|
1058 |
|
|
* retran path, update the retran path and use it.
|
1059 |
|
|
*/
|
1060 |
|
|
if (!asoc->shutdown_last_sent_to)
|
1061 |
|
|
return asoc->peer.active_path;
|
1062 |
|
|
else {
|
1063 |
|
|
if (asoc->shutdown_last_sent_to == asoc->peer.retran_path)
|
1064 |
|
|
sctp_assoc_update_retran_path(asoc);
|
1065 |
|
|
return asoc->peer.retran_path;
|
1066 |
|
|
}
|
1067 |
|
|
|
1068 |
|
|
}
|
1069 |
|
|
|
1070 |
|
|
/* Update the association's pmtu and frag_point by going through all the
|
1071 |
|
|
* transports. This routine is called when a transport's PMTU has changed.
|
1072 |
|
|
*/
|
1073 |
|
|
void sctp_assoc_sync_pmtu(struct sctp_association *asoc)
|
1074 |
|
|
{
|
1075 |
|
|
struct sctp_transport *t;
|
1076 |
|
|
struct list_head *pos;
|
1077 |
|
|
__u32 pmtu = 0;
|
1078 |
|
|
|
1079 |
|
|
if (!asoc)
|
1080 |
|
|
return;
|
1081 |
|
|
|
1082 |
|
|
/* Get the lowest pmtu of all the transports. */
|
1083 |
|
|
list_for_each(pos, &asoc->peer.transport_addr_list) {
|
1084 |
|
|
t = list_entry(pos, struct sctp_transport, transports);
|
1085 |
|
|
if (!pmtu || (t->pmtu < pmtu))
|
1086 |
|
|
pmtu = t->pmtu;
|
1087 |
|
|
}
|
1088 |
|
|
|
1089 |
|
|
if (pmtu) {
|
1090 |
|
|
struct sctp_opt *sp = sctp_sk(asoc->base.sk);
|
1091 |
|
|
asoc->pmtu = pmtu;
|
1092 |
|
|
asoc->frag_point = sctp_frag_point(sp, pmtu);
|
1093 |
|
|
}
|
1094 |
|
|
|
1095 |
|
|
SCTP_DEBUG_PRINTK("%s: asoc:%p, pmtu:%d, frag_point:%d\n",
|
1096 |
|
|
__FUNCTION__, asoc, asoc->pmtu, asoc->frag_point);
|
1097 |
|
|
}
|
1098 |
|
|
|
1099 |
|
|
/* Should we send a SACK to update our peer? */
|
1100 |
|
|
static inline int sctp_peer_needs_update(struct sctp_association *asoc)
|
1101 |
|
|
{
|
1102 |
|
|
switch (asoc->state) {
|
1103 |
|
|
case SCTP_STATE_ESTABLISHED:
|
1104 |
|
|
case SCTP_STATE_SHUTDOWN_PENDING:
|
1105 |
|
|
case SCTP_STATE_SHUTDOWN_RECEIVED:
|
1106 |
|
|
if ((asoc->rwnd > asoc->a_rwnd) &&
|
1107 |
|
|
((asoc->rwnd - asoc->a_rwnd) >=
|
1108 |
|
|
min_t(__u32, (asoc->base.sk->sk_rcvbuf >> 1), asoc->pmtu)))
|
1109 |
|
|
return 1;
|
1110 |
|
|
break;
|
1111 |
|
|
default:
|
1112 |
|
|
break;
|
1113 |
|
|
}
|
1114 |
|
|
return 0;
|
1115 |
|
|
}
|
1116 |
|
|
|
1117 |
|
|
/* Increase asoc's rwnd by len and send any window update SACK if needed. */
|
1118 |
|
|
void sctp_assoc_rwnd_increase(struct sctp_association *asoc, unsigned len)
|
1119 |
|
|
{
|
1120 |
|
|
struct sctp_chunk *sack;
|
1121 |
|
|
struct timer_list *timer;
|
1122 |
|
|
|
1123 |
|
|
if (asoc->rwnd_over) {
|
1124 |
|
|
if (asoc->rwnd_over >= len) {
|
1125 |
|
|
asoc->rwnd_over -= len;
|
1126 |
|
|
} else {
|
1127 |
|
|
asoc->rwnd += (len - asoc->rwnd_over);
|
1128 |
|
|
asoc->rwnd_over = 0;
|
1129 |
|
|
}
|
1130 |
|
|
} else {
|
1131 |
|
|
asoc->rwnd += len;
|
1132 |
|
|
}
|
1133 |
|
|
|
1134 |
|
|
SCTP_DEBUG_PRINTK("%s: asoc %p rwnd increased by %d to (%u, %u) "
|
1135 |
|
|
"- %u\n", __FUNCTION__, asoc, len, asoc->rwnd,
|
1136 |
|
|
asoc->rwnd_over, asoc->a_rwnd);
|
1137 |
|
|
|
1138 |
|
|
/* Send a window update SACK if the rwnd has increased by at least the
|
1139 |
|
|
* minimum of the association's PMTU and half of the receive buffer.
|
1140 |
|
|
* The algorithm used is similar to the one described in
|
1141 |
|
|
* Section 4.2.3.3 of RFC 1122.
|
1142 |
|
|
*/
|
1143 |
|
|
if (sctp_peer_needs_update(asoc)) {
|
1144 |
|
|
asoc->a_rwnd = asoc->rwnd;
|
1145 |
|
|
SCTP_DEBUG_PRINTK("%s: Sending window update SACK- asoc: %p "
|
1146 |
|
|
"rwnd: %u a_rwnd: %u\n", __FUNCTION__,
|
1147 |
|
|
asoc, asoc->rwnd, asoc->a_rwnd);
|
1148 |
|
|
sack = sctp_make_sack(asoc);
|
1149 |
|
|
if (!sack)
|
1150 |
|
|
return;
|
1151 |
|
|
|
1152 |
|
|
asoc->peer.sack_needed = 0;
|
1153 |
|
|
|
1154 |
|
|
sctp_outq_tail(&asoc->outqueue, sack);
|
1155 |
|
|
|
1156 |
|
|
/* Stop the SACK timer. */
|
1157 |
|
|
timer = &asoc->timers[SCTP_EVENT_TIMEOUT_SACK];
|
1158 |
|
|
if (timer_pending(timer) && del_timer(timer))
|
1159 |
|
|
sctp_association_put(asoc);
|
1160 |
|
|
}
|
1161 |
|
|
}
|
1162 |
|
|
|
1163 |
|
|
/* Decrease asoc's rwnd by len. */
|
1164 |
|
|
void sctp_assoc_rwnd_decrease(struct sctp_association *asoc, unsigned len)
|
1165 |
|
|
{
|
1166 |
|
|
SCTP_ASSERT(asoc->rwnd, "rwnd zero", return);
|
1167 |
|
|
SCTP_ASSERT(!asoc->rwnd_over, "rwnd_over not zero", return);
|
1168 |
|
|
if (asoc->rwnd >= len) {
|
1169 |
|
|
asoc->rwnd -= len;
|
1170 |
|
|
} else {
|
1171 |
|
|
asoc->rwnd_over = len - asoc->rwnd;
|
1172 |
|
|
asoc->rwnd = 0;
|
1173 |
|
|
}
|
1174 |
|
|
SCTP_DEBUG_PRINTK("%s: asoc %p rwnd decreased by %d to (%u, %u)\n",
|
1175 |
|
|
__FUNCTION__, asoc, len, asoc->rwnd,
|
1176 |
|
|
asoc->rwnd_over);
|
1177 |
|
|
}
|
1178 |
|
|
|
1179 |
|
|
/* Build the bind address list for the association based on info from the
|
1180 |
|
|
* local endpoint and the remote peer.
|
1181 |
|
|
*/
|
1182 |
|
|
int sctp_assoc_set_bind_addr_from_ep(struct sctp_association *asoc, int gfp)
|
1183 |
|
|
{
|
1184 |
|
|
sctp_scope_t scope;
|
1185 |
|
|
int flags;
|
1186 |
|
|
|
1187 |
|
|
/* Use scoping rules to determine the subset of addresses from
|
1188 |
|
|
* the endpoint.
|
1189 |
|
|
*/
|
1190 |
|
|
scope = sctp_scope(&asoc->peer.active_path->ipaddr);
|
1191 |
|
|
flags = (PF_INET6 == asoc->base.sk->sk_family) ? SCTP_ADDR6_ALLOWED : 0;
|
1192 |
|
|
if (asoc->peer.ipv4_address)
|
1193 |
|
|
flags |= SCTP_ADDR4_PEERSUPP;
|
1194 |
|
|
if (asoc->peer.ipv6_address)
|
1195 |
|
|
flags |= SCTP_ADDR6_PEERSUPP;
|
1196 |
|
|
|
1197 |
|
|
return sctp_bind_addr_copy(&asoc->base.bind_addr,
|
1198 |
|
|
&asoc->ep->base.bind_addr,
|
1199 |
|
|
scope, gfp, flags);
|
1200 |
|
|
}
|
1201 |
|
|
|
1202 |
|
|
/* Build the association's bind address list from the cookie. */
|
1203 |
|
|
int sctp_assoc_set_bind_addr_from_cookie(struct sctp_association *asoc,
|
1204 |
|
|
struct sctp_cookie *cookie, int gfp)
|
1205 |
|
|
{
|
1206 |
|
|
int var_size2 = ntohs(cookie->peer_init->chunk_hdr.length);
|
1207 |
|
|
int var_size3 = cookie->raw_addr_list_len;
|
1208 |
|
|
__u8 *raw = (__u8 *)cookie + sizeof(struct sctp_cookie) + var_size2;
|
1209 |
|
|
|
1210 |
|
|
return sctp_raw_to_bind_addrs(&asoc->base.bind_addr, raw, var_size3,
|
1211 |
|
|
asoc->ep->base.bind_addr.port, gfp);
|
1212 |
|
|
}
|
1213 |
|
|
|
1214 |
|
|
/* Lookup laddr in the bind address list of an association. */
|
1215 |
|
|
int sctp_assoc_lookup_laddr(struct sctp_association *asoc,
|
1216 |
|
|
const union sctp_addr *laddr)
|
1217 |
|
|
{
|
1218 |
|
|
int found;
|
1219 |
|
|
|
1220 |
|
|
sctp_read_lock(&asoc->base.addr_lock);
|
1221 |
|
|
if ((asoc->base.bind_addr.port == ntohs(laddr->v4.sin_port)) &&
|
1222 |
|
|
sctp_bind_addr_match(&asoc->base.bind_addr, laddr,
|
1223 |
|
|
sctp_sk(asoc->base.sk))) {
|
1224 |
|
|
found = 1;
|
1225 |
|
|
goto out;
|
1226 |
|
|
}
|
1227 |
|
|
|
1228 |
|
|
found = 0;
|
1229 |
|
|
out:
|
1230 |
|
|
sctp_read_unlock(&asoc->base.addr_lock);
|
1231 |
|
|
return found;
|
1232 |
|
|
}
|