1 |
1275 |
phoenix |
/* SCTP kernel reference Implementation
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2 |
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* (C) Copyright IBM Corp. 2001, 2004
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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 Nokia, Inc.
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7 |
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* Copyright (c) 2001 La Monte H.P. Yarroll
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8 |
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*
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9 |
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* This file is part of the SCTP kernel reference Implementation
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10 |
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*
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11 |
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* Initialization/cleanup for SCTP protocol support.
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12 |
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*
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* The SCTP reference implementation is free software;
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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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* any later version.
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*
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19 |
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* The SCTP reference implementation is distributed in the hope that it
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* will be useful, but WITHOUT ANY WARRANTY; without even the implied
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21 |
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* ************************
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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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24 |
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*
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* You should have received a copy of the GNU General Public License
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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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* Boston, MA 02111-1307, USA.
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*
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30 |
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* Please send any bug reports or fixes you make to the
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31 |
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* email address(es):
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* lksctp developers <lksctp-developers@lists.sourceforge.net>
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*
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34 |
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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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* La Monte H.P. Yarroll <piggy@acm.org>
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* Karl Knutson <karl@athena.chicago.il.us>
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40 |
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* Jon Grimm <jgrimm@us.ibm.com>
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41 |
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* Sridhar Samudrala <sri@us.ibm.com>
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42 |
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* Daisy Chang <daisyc@us.ibm.com>
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43 |
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* Ardelle Fan <ardelle.fan@intel.com>
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*
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* Any bugs reported given to us we will try to fix... any fixes shared will
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* be incorporated into the next SCTP release.
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*/
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#include <linux/module.h>
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50 |
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#include <linux/init.h>
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51 |
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#include <linux/netdevice.h>
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52 |
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#include <linux/inetdevice.h>
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53 |
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#include <linux/seq_file.h>
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#include <net/protocol.h>
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55 |
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#include <net/ip.h>
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56 |
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#include <net/ipv6.h>
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57 |
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#include <net/sctp/sctp.h>
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58 |
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#include <net/addrconf.h>
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59 |
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#include <net/inet_common.h>
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60 |
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#include <net/inet_ecn.h>
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61 |
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62 |
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/* Global data structures. */
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63 |
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struct sctp_globals sctp_globals;
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64 |
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struct proc_dir_entry *proc_net_sctp;
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65 |
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DEFINE_SNMP_STAT(struct sctp_mib, sctp_statistics);
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66 |
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67 |
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/* This is the global socket data structure used for responding to
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68 |
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* the Out-of-the-blue (OOTB) packets. A control sock will be created
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69 |
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* for this socket at the initialization time.
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70 |
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*/
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71 |
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static struct socket *sctp_ctl_socket;
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72 |
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73 |
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static struct sctp_pf *sctp_pf_inet6_specific;
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74 |
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static struct sctp_pf *sctp_pf_inet_specific;
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75 |
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static struct sctp_af *sctp_af_v4_specific;
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76 |
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static struct sctp_af *sctp_af_v6_specific;
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77 |
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78 |
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kmem_cache_t *sctp_chunk_cachep;
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79 |
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80 |
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extern struct net_proto_family inet_family_ops;
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81 |
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82 |
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extern int sctp_snmp_proc_init(void);
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83 |
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extern int sctp_snmp_proc_exit(void);
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84 |
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extern int sctp_eps_proc_init(void);
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85 |
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extern int sctp_eps_proc_exit(void);
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86 |
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extern int sctp_assocs_proc_init(void);
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87 |
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extern int sctp_assocs_proc_exit(void);
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88 |
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89 |
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/* Return the address of the control sock. */
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90 |
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struct sock *sctp_get_ctl_sock(void)
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91 |
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{
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92 |
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return sctp_ctl_socket->sk;
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93 |
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}
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94 |
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95 |
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/* Set up the proc fs entry for the SCTP protocol. */
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96 |
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__init int sctp_proc_init(void)
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97 |
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{
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98 |
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if (!proc_net_sctp) {
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99 |
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struct proc_dir_entry *ent;
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100 |
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ent = proc_mkdir("net/sctp", 0);
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101 |
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if (ent) {
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102 |
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ent->owner = THIS_MODULE;
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103 |
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proc_net_sctp = ent;
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104 |
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} else
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105 |
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goto out_nomem;
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106 |
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}
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107 |
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108 |
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if (sctp_snmp_proc_init())
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109 |
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goto out_nomem;
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110 |
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if (sctp_eps_proc_init())
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111 |
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goto out_nomem;
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112 |
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if (sctp_assocs_proc_init())
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113 |
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goto out_nomem;
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114 |
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115 |
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return 0;
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116 |
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117 |
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out_nomem:
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118 |
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return -ENOMEM;
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119 |
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}
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120 |
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121 |
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/* Clean up the proc fs entry for the SCTP protocol.
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122 |
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* Note: Do not make this __exit as it is used in the init error
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123 |
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* path.
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124 |
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*/
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125 |
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void sctp_proc_exit(void)
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126 |
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{
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127 |
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sctp_snmp_proc_exit();
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128 |
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sctp_eps_proc_exit();
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129 |
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sctp_assocs_proc_exit();
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130 |
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131 |
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if (proc_net_sctp) {
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132 |
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proc_net_sctp = NULL;
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133 |
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remove_proc_entry("net/sctp", 0);
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134 |
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}
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135 |
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}
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136 |
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137 |
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/* Private helper to extract ipv4 address and stash them in
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138 |
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* the protocol structure.
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139 |
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*/
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140 |
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static void sctp_v4_copy_addrlist(struct list_head *addrlist,
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141 |
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struct net_device *dev)
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142 |
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{
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143 |
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struct in_device *in_dev;
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144 |
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struct in_ifaddr *ifa;
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145 |
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struct sctp_sockaddr_entry *addr;
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146 |
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147 |
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read_lock(&inetdev_lock);
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148 |
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if ((in_dev = __in_dev_get(dev)) == NULL) {
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149 |
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read_unlock(&inetdev_lock);
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150 |
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return;
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151 |
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}
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152 |
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153 |
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read_lock(&in_dev->lock);
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154 |
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for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
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155 |
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/* Add the address to the local list. */
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156 |
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addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC);
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157 |
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if (addr) {
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158 |
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addr->a.v4.sin_family = AF_INET;
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159 |
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addr->a.v4.sin_port = 0;
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160 |
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addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
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161 |
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list_add_tail(&addr->list, addrlist);
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162 |
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}
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163 |
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}
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164 |
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165 |
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read_unlock(&in_dev->lock);
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166 |
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read_unlock(&inetdev_lock);
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167 |
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}
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168 |
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169 |
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/* Extract our IP addresses from the system and stash them in the
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170 |
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* protocol structure.
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171 |
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*/
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172 |
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static void __sctp_get_local_addr_list(void)
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173 |
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{
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174 |
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struct net_device *dev;
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175 |
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struct list_head *pos;
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176 |
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struct sctp_af *af;
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177 |
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178 |
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read_lock(&dev_base_lock);
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179 |
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for (dev = dev_base; dev; dev = dev->next) {
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180 |
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list_for_each(pos, &sctp_address_families) {
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181 |
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af = list_entry(pos, struct sctp_af, list);
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182 |
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af->copy_addrlist(&sctp_local_addr_list, dev);
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183 |
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}
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184 |
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}
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185 |
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read_unlock(&dev_base_lock);
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186 |
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}
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187 |
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188 |
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static void sctp_get_local_addr_list(void)
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189 |
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{
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190 |
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unsigned long flags;
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191 |
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192 |
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sctp_spin_lock_irqsave(&sctp_local_addr_lock, flags);
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193 |
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__sctp_get_local_addr_list();
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194 |
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sctp_spin_unlock_irqrestore(&sctp_local_addr_lock, flags);
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195 |
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}
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196 |
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197 |
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/* Free the existing local addresses. */
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198 |
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static void __sctp_free_local_addr_list(void)
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199 |
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{
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200 |
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struct sctp_sockaddr_entry *addr;
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201 |
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struct list_head *pos, *temp;
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202 |
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|
203 |
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list_for_each_safe(pos, temp, &sctp_local_addr_list) {
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204 |
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addr = list_entry(pos, struct sctp_sockaddr_entry, list);
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205 |
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list_del(pos);
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206 |
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kfree(addr);
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207 |
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}
|
208 |
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}
|
209 |
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|
210 |
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/* Free the existing local addresses. */
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211 |
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static void sctp_free_local_addr_list(void)
|
212 |
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{
|
213 |
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unsigned long flags;
|
214 |
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|
215 |
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sctp_spin_lock_irqsave(&sctp_local_addr_lock, flags);
|
216 |
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__sctp_free_local_addr_list();
|
217 |
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sctp_spin_unlock_irqrestore(&sctp_local_addr_lock, flags);
|
218 |
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}
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219 |
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|
220 |
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/* Copy the local addresses which are valid for 'scope' into 'bp'. */
|
221 |
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int sctp_copy_local_addr_list(struct sctp_bind_addr *bp, sctp_scope_t scope,
|
222 |
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int gfp, int copy_flags)
|
223 |
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{
|
224 |
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struct sctp_sockaddr_entry *addr;
|
225 |
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int error = 0;
|
226 |
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struct list_head *pos;
|
227 |
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unsigned long flags;
|
228 |
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|
229 |
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sctp_spin_lock_irqsave(&sctp_local_addr_lock, flags);
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230 |
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list_for_each(pos, &sctp_local_addr_list) {
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231 |
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addr = list_entry(pos, struct sctp_sockaddr_entry, list);
|
232 |
|
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if (sctp_in_scope(&addr->a, scope)) {
|
233 |
|
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/* Now that the address is in scope, check to see if
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234 |
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* the address type is really supported by the local
|
235 |
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* sock as well as the remote peer.
|
236 |
|
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*/
|
237 |
|
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if ((((AF_INET == addr->a.sa.sa_family) &&
|
238 |
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(copy_flags & SCTP_ADDR4_PEERSUPP))) ||
|
239 |
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(((AF_INET6 == addr->a.sa.sa_family) &&
|
240 |
|
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(copy_flags & SCTP_ADDR6_ALLOWED) &&
|
241 |
|
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(copy_flags & SCTP_ADDR6_PEERSUPP)))) {
|
242 |
|
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error = sctp_add_bind_addr(bp, &addr->a,
|
243 |
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GFP_ATOMIC);
|
244 |
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if (error)
|
245 |
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goto end_copy;
|
246 |
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}
|
247 |
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}
|
248 |
|
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}
|
249 |
|
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|
250 |
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end_copy:
|
251 |
|
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sctp_spin_unlock_irqrestore(&sctp_local_addr_lock, flags);
|
252 |
|
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return error;
|
253 |
|
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}
|
254 |
|
|
|
255 |
|
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/* Initialize a sctp_addr from in incoming skb. */
|
256 |
|
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static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb,
|
257 |
|
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int is_saddr)
|
258 |
|
|
{
|
259 |
|
|
void *from;
|
260 |
|
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__u16 *port;
|
261 |
|
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struct sctphdr *sh;
|
262 |
|
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|
263 |
|
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port = &addr->v4.sin_port;
|
264 |
|
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addr->v4.sin_family = AF_INET;
|
265 |
|
|
|
266 |
|
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sh = (struct sctphdr *) skb->h.raw;
|
267 |
|
|
if (is_saddr) {
|
268 |
|
|
*port = ntohs(sh->source);
|
269 |
|
|
from = &skb->nh.iph->saddr;
|
270 |
|
|
} else {
|
271 |
|
|
*port = ntohs(sh->dest);
|
272 |
|
|
from = &skb->nh.iph->daddr;
|
273 |
|
|
}
|
274 |
|
|
memcpy(&addr->v4.sin_addr.s_addr, from, sizeof(struct in_addr));
|
275 |
|
|
}
|
276 |
|
|
|
277 |
|
|
/* Initialize an sctp_addr from a socket. */
|
278 |
|
|
static void sctp_v4_from_sk(union sctp_addr *addr, struct sock *sk)
|
279 |
|
|
{
|
280 |
|
|
addr->v4.sin_family = AF_INET;
|
281 |
|
|
addr->v4.sin_port = sk->num;
|
282 |
|
|
addr->v4.sin_addr.s_addr = sk->rcv_saddr;
|
283 |
|
|
}
|
284 |
|
|
|
285 |
|
|
/* Initialize sk->sk_rcv_saddr from sctp_addr. */
|
286 |
|
|
static void sctp_v4_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
|
287 |
|
|
{
|
288 |
|
|
sk->rcv_saddr = addr->v4.sin_addr.s_addr;
|
289 |
|
|
}
|
290 |
|
|
|
291 |
|
|
/* Initialize sk->sk_daddr from sctp_addr. */
|
292 |
|
|
static void sctp_v4_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
|
293 |
|
|
{
|
294 |
|
|
sk->daddr = addr->v4.sin_addr.s_addr;
|
295 |
|
|
}
|
296 |
|
|
|
297 |
|
|
/* Initialize a sctp_addr from an address parameter. */
|
298 |
|
|
static void sctp_v4_from_addr_param(union sctp_addr *addr,
|
299 |
|
|
union sctp_addr_param *param,
|
300 |
|
|
__u16 port, int iif)
|
301 |
|
|
{
|
302 |
|
|
addr->v4.sin_family = AF_INET;
|
303 |
|
|
addr->v4.sin_port = port;
|
304 |
|
|
addr->v4.sin_addr.s_addr = param->v4.addr.s_addr;
|
305 |
|
|
}
|
306 |
|
|
|
307 |
|
|
/* Initialize an address parameter from a sctp_addr and return the length
|
308 |
|
|
* of the address parameter.
|
309 |
|
|
*/
|
310 |
|
|
static int sctp_v4_to_addr_param(const union sctp_addr *addr,
|
311 |
|
|
union sctp_addr_param *param)
|
312 |
|
|
{
|
313 |
|
|
int length = sizeof(sctp_ipv4addr_param_t);
|
314 |
|
|
|
315 |
|
|
param->v4.param_hdr.type = SCTP_PARAM_IPV4_ADDRESS;
|
316 |
|
|
param->v4.param_hdr.length = ntohs(length);
|
317 |
|
|
param->v4.addr.s_addr = addr->v4.sin_addr.s_addr;
|
318 |
|
|
|
319 |
|
|
return length;
|
320 |
|
|
}
|
321 |
|
|
|
322 |
|
|
/* Initialize a sctp_addr from a dst_entry. */
|
323 |
|
|
static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct dst_entry *dst,
|
324 |
|
|
unsigned short port)
|
325 |
|
|
{
|
326 |
|
|
struct rtable *rt = (struct rtable *)dst;
|
327 |
|
|
saddr->v4.sin_family = AF_INET;
|
328 |
|
|
saddr->v4.sin_port = port;
|
329 |
|
|
saddr->v4.sin_addr.s_addr = rt->rt_src;
|
330 |
|
|
}
|
331 |
|
|
|
332 |
|
|
/* Compare two addresses exactly. */
|
333 |
|
|
static int sctp_v4_cmp_addr(const union sctp_addr *addr1,
|
334 |
|
|
const union sctp_addr *addr2)
|
335 |
|
|
{
|
336 |
|
|
if (addr1->sa.sa_family != addr2->sa.sa_family)
|
337 |
|
|
return 0;
|
338 |
|
|
if (addr1->v4.sin_port != addr2->v4.sin_port)
|
339 |
|
|
return 0;
|
340 |
|
|
if (addr1->v4.sin_addr.s_addr != addr2->v4.sin_addr.s_addr)
|
341 |
|
|
return 0;
|
342 |
|
|
|
343 |
|
|
return 1;
|
344 |
|
|
}
|
345 |
|
|
|
346 |
|
|
/* Initialize addr struct to INADDR_ANY. */
|
347 |
|
|
static void sctp_v4_inaddr_any(union sctp_addr *addr, unsigned short port)
|
348 |
|
|
{
|
349 |
|
|
addr->v4.sin_family = AF_INET;
|
350 |
|
|
addr->v4.sin_addr.s_addr = INADDR_ANY;
|
351 |
|
|
addr->v4.sin_port = port;
|
352 |
|
|
}
|
353 |
|
|
|
354 |
|
|
/* Is this a wildcard address? */
|
355 |
|
|
static int sctp_v4_is_any(const union sctp_addr *addr)
|
356 |
|
|
{
|
357 |
|
|
return INADDR_ANY == addr->v4.sin_addr.s_addr;
|
358 |
|
|
}
|
359 |
|
|
|
360 |
|
|
/* This function checks if the address is a valid address to be used for
|
361 |
|
|
* SCTP binding.
|
362 |
|
|
*
|
363 |
|
|
* Output:
|
364 |
|
|
* Return 0 - If the address is a non-unicast or an illegal address.
|
365 |
|
|
* Return 1 - If the address is a unicast.
|
366 |
|
|
*/
|
367 |
|
|
static int sctp_v4_addr_valid(union sctp_addr *addr, struct sctp_opt *sp)
|
368 |
|
|
{
|
369 |
|
|
/* Is this a non-unicast address or a unusable SCTP address? */
|
370 |
|
|
if (IS_IPV4_UNUSABLE_ADDRESS(&addr->v4.sin_addr.s_addr))
|
371 |
|
|
return 0;
|
372 |
|
|
|
373 |
|
|
return 1;
|
374 |
|
|
}
|
375 |
|
|
|
376 |
|
|
/* Should this be available for binding? */
|
377 |
|
|
static int sctp_v4_available(union sctp_addr *addr, struct sctp_opt *sp)
|
378 |
|
|
{
|
379 |
|
|
int ret = inet_addr_type(addr->v4.sin_addr.s_addr);
|
380 |
|
|
|
381 |
|
|
/* FIXME: ip_nonlocal_bind sysctl support. */
|
382 |
|
|
|
383 |
|
|
if (addr->v4.sin_addr.s_addr != INADDR_ANY && ret != RTN_LOCAL)
|
384 |
|
|
return 0;
|
385 |
|
|
return 1;
|
386 |
|
|
}
|
387 |
|
|
|
388 |
|
|
/* Checking the loopback, private and other address scopes as defined in
|
389 |
|
|
* RFC 1918. The IPv4 scoping is based on the draft for SCTP IPv4
|
390 |
|
|
* scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>.
|
391 |
|
|
*
|
392 |
|
|
* Level 0 - unusable SCTP addresses
|
393 |
|
|
* Level 1 - loopback address
|
394 |
|
|
* Level 2 - link-local addresses
|
395 |
|
|
* Level 3 - private addresses.
|
396 |
|
|
* Level 4 - global addresses
|
397 |
|
|
* For INIT and INIT-ACK address list, let L be the level of
|
398 |
|
|
* of requested destination address, sender and receiver
|
399 |
|
|
* SHOULD include all of its addresses with level greater
|
400 |
|
|
* than or equal to L.
|
401 |
|
|
*/
|
402 |
|
|
static sctp_scope_t sctp_v4_scope(union sctp_addr *addr)
|
403 |
|
|
{
|
404 |
|
|
sctp_scope_t retval;
|
405 |
|
|
|
406 |
|
|
/* Should IPv4 scoping be a sysctl configurable option
|
407 |
|
|
* so users can turn it off (default on) for certain
|
408 |
|
|
* unconventional networking environments?
|
409 |
|
|
*/
|
410 |
|
|
|
411 |
|
|
/* Check for unusable SCTP addresses. */
|
412 |
|
|
if (IS_IPV4_UNUSABLE_ADDRESS(&addr->v4.sin_addr.s_addr)) {
|
413 |
|
|
retval = SCTP_SCOPE_UNUSABLE;
|
414 |
|
|
} else if (LOOPBACK(addr->v4.sin_addr.s_addr)) {
|
415 |
|
|
retval = SCTP_SCOPE_LOOPBACK;
|
416 |
|
|
} else if (IS_IPV4_LINK_ADDRESS(&addr->v4.sin_addr.s_addr)) {
|
417 |
|
|
retval = SCTP_SCOPE_LINK;
|
418 |
|
|
} else if (IS_IPV4_PRIVATE_ADDRESS(&addr->v4.sin_addr.s_addr)) {
|
419 |
|
|
retval = SCTP_SCOPE_PRIVATE;
|
420 |
|
|
} else {
|
421 |
|
|
retval = SCTP_SCOPE_GLOBAL;
|
422 |
|
|
}
|
423 |
|
|
|
424 |
|
|
return retval;
|
425 |
|
|
}
|
426 |
|
|
|
427 |
|
|
/* Returns a valid dst cache entry for the given source and destination ip
|
428 |
|
|
* addresses. If an association is passed, trys to get a dst entry with a
|
429 |
|
|
* source address that matches an address in the bind address list.
|
430 |
|
|
*/
|
431 |
|
|
struct dst_entry *sctp_v4_get_dst(struct sctp_association *asoc,
|
432 |
|
|
union sctp_addr *daddr,
|
433 |
|
|
union sctp_addr *saddr)
|
434 |
|
|
{
|
435 |
|
|
struct rtable *rt;
|
436 |
|
|
struct rt_key key;
|
437 |
|
|
struct sctp_bind_addr *bp;
|
438 |
|
|
rwlock_t *addr_lock;
|
439 |
|
|
struct sctp_sockaddr_entry *laddr;
|
440 |
|
|
struct list_head *pos;
|
441 |
|
|
struct dst_entry *dst = NULL;
|
442 |
|
|
union sctp_addr dst_saddr;
|
443 |
|
|
|
444 |
|
|
memset(&key, 0x0, sizeof(struct rt_key));
|
445 |
|
|
key.dst = daddr->v4.sin_addr.s_addr;
|
446 |
|
|
|
447 |
|
|
if (asoc) {
|
448 |
|
|
key.tos = RT_CONN_FLAGS(asoc->base.sk);
|
449 |
|
|
key.oif = asoc->base.sk->bound_dev_if;
|
450 |
|
|
}
|
451 |
|
|
if (saddr)
|
452 |
|
|
key.src = saddr->v4.sin_addr.s_addr;
|
453 |
|
|
|
454 |
|
|
SCTP_DEBUG_PRINTK("%s: DST:%u.%u.%u.%u, SRC:%u.%u.%u.%u - ",
|
455 |
|
|
__FUNCTION__, NIPQUAD(key.dst),
|
456 |
|
|
NIPQUAD(key.src));
|
457 |
|
|
|
458 |
|
|
if (!ip_route_output_key(&rt, &key)) {
|
459 |
|
|
dst = &rt->u.dst;
|
460 |
|
|
}
|
461 |
|
|
|
462 |
|
|
/* If there is no association or if a source address is passed, no
|
463 |
|
|
* more validation is required.
|
464 |
|
|
*/
|
465 |
|
|
if (!asoc || saddr)
|
466 |
|
|
goto out;
|
467 |
|
|
|
468 |
|
|
bp = &asoc->base.bind_addr;
|
469 |
|
|
addr_lock = &asoc->base.addr_lock;
|
470 |
|
|
|
471 |
|
|
if (dst) {
|
472 |
|
|
/* Walk through the bind address list and look for a bind
|
473 |
|
|
* address that matches the source address of the returned dst.
|
474 |
|
|
*/
|
475 |
|
|
sctp_read_lock(addr_lock);
|
476 |
|
|
list_for_each(pos, &bp->address_list) {
|
477 |
|
|
laddr = list_entry(pos, struct sctp_sockaddr_entry,
|
478 |
|
|
list);
|
479 |
|
|
sctp_v4_dst_saddr(&dst_saddr, dst, bp->port);
|
480 |
|
|
if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a))
|
481 |
|
|
goto out_unlock;
|
482 |
|
|
}
|
483 |
|
|
sctp_read_unlock(addr_lock);
|
484 |
|
|
|
485 |
|
|
/* None of the bound addresses match the source address of the
|
486 |
|
|
* dst. So release it.
|
487 |
|
|
*/
|
488 |
|
|
dst_release(dst);
|
489 |
|
|
dst = NULL;
|
490 |
|
|
}
|
491 |
|
|
|
492 |
|
|
/* Walk through the bind address list and try to get a dst that
|
493 |
|
|
* matches a bind address as the source address.
|
494 |
|
|
*/
|
495 |
|
|
sctp_read_lock(addr_lock);
|
496 |
|
|
list_for_each(pos, &bp->address_list) {
|
497 |
|
|
laddr = list_entry(pos, struct sctp_sockaddr_entry, list);
|
498 |
|
|
|
499 |
|
|
if (AF_INET == laddr->a.sa.sa_family) {
|
500 |
|
|
key.src = laddr->a.v4.sin_addr.s_addr;
|
501 |
|
|
if (!ip_route_output_key(&rt, &key)) {
|
502 |
|
|
dst = &rt->u.dst;
|
503 |
|
|
goto out_unlock;
|
504 |
|
|
}
|
505 |
|
|
}
|
506 |
|
|
}
|
507 |
|
|
|
508 |
|
|
out_unlock:
|
509 |
|
|
sctp_read_unlock(addr_lock);
|
510 |
|
|
out:
|
511 |
|
|
if (dst)
|
512 |
|
|
SCTP_DEBUG_PRINTK("rt_dst:%u.%u.%u.%u, rt_src:%u.%u.%u.%u\n",
|
513 |
|
|
NIPQUAD(rt->rt_dst), NIPQUAD(rt->rt_src));
|
514 |
|
|
else
|
515 |
|
|
SCTP_DEBUG_PRINTK("NO ROUTE\n");
|
516 |
|
|
|
517 |
|
|
return dst;
|
518 |
|
|
}
|
519 |
|
|
|
520 |
|
|
/* For v4, the source address is cached in the route entry(dst). So no need
|
521 |
|
|
* to cache it separately and hence this is an empty routine.
|
522 |
|
|
*/
|
523 |
|
|
void sctp_v4_get_saddr(struct sctp_association *asoc,
|
524 |
|
|
struct dst_entry *dst,
|
525 |
|
|
union sctp_addr *daddr,
|
526 |
|
|
union sctp_addr *saddr)
|
527 |
|
|
{
|
528 |
|
|
struct rtable *rt = (struct rtable *)dst;
|
529 |
|
|
|
530 |
|
|
if (rt) {
|
531 |
|
|
saddr->v4.sin_family = AF_INET;
|
532 |
|
|
saddr->v4.sin_port = asoc->base.bind_addr.port;
|
533 |
|
|
saddr->v4.sin_addr.s_addr = rt->rt_src;
|
534 |
|
|
}
|
535 |
|
|
}
|
536 |
|
|
|
537 |
|
|
/* What interface did this skb arrive on? */
|
538 |
|
|
static int sctp_v4_skb_iif(const struct sk_buff *skb)
|
539 |
|
|
{
|
540 |
|
|
return ((struct rtable *)skb->dst)->rt_iif;
|
541 |
|
|
}
|
542 |
|
|
|
543 |
|
|
/* Was this packet marked by Explicit Congestion Notification? */
|
544 |
|
|
static int sctp_v4_is_ce(const struct sk_buff *skb)
|
545 |
|
|
{
|
546 |
|
|
return INET_ECN_is_ce(skb->nh.iph->tos);
|
547 |
|
|
}
|
548 |
|
|
|
549 |
|
|
/* Create and initialize a new sk for the socket returned by accept(). */
|
550 |
|
|
struct sock *sctp_v4_create_accept_sk(struct sock *sk,
|
551 |
|
|
struct sctp_association *asoc)
|
552 |
|
|
{
|
553 |
|
|
struct sock *newsk;
|
554 |
|
|
struct inet_opt *inet = inet_sk(sk);
|
555 |
|
|
struct inet_opt *newinet;
|
556 |
|
|
|
557 |
|
|
newsk = sk_alloc(PF_INET, GFP_KERNEL, sizeof(struct sock));
|
558 |
|
|
if (!newsk)
|
559 |
|
|
goto out;
|
560 |
|
|
|
561 |
|
|
sock_init_data(NULL, newsk);
|
562 |
|
|
sk_set_owner(newsk, THIS_MODULE);
|
563 |
|
|
|
564 |
|
|
newsk->sk_type = SOCK_STREAM;
|
565 |
|
|
|
566 |
|
|
newsk->sk_prot = sk->sk_prot;
|
567 |
|
|
newsk->sk_no_check = sk->sk_no_check;
|
568 |
|
|
newsk->sk_reuse = sk->sk_reuse;
|
569 |
|
|
newsk->sk_shutdown = sk->sk_shutdown;
|
570 |
|
|
|
571 |
|
|
newsk->sk_destruct = inet_sock_destruct;
|
572 |
|
|
newsk->sk_zapped = 0;
|
573 |
|
|
newsk->sk_family = PF_INET;
|
574 |
|
|
newsk->sk_protocol = IPPROTO_SCTP;
|
575 |
|
|
newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
|
576 |
|
|
|
577 |
|
|
newinet = inet_sk(newsk);
|
578 |
|
|
|
579 |
|
|
/* Initialize sk's sport, dport, rcv_saddr and daddr for
|
580 |
|
|
* getsockname() and getpeername()
|
581 |
|
|
*/
|
582 |
|
|
newsk->sport = sk->sport;
|
583 |
|
|
newsk->saddr = sk->saddr;
|
584 |
|
|
newsk->rcv_saddr = sk->rcv_saddr;
|
585 |
|
|
newsk->dport = htons(asoc->peer.port);
|
586 |
|
|
newsk->daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr;
|
587 |
|
|
newinet->pmtudisc = inet->pmtudisc;
|
588 |
|
|
newinet->id = 0;
|
589 |
|
|
|
590 |
|
|
newinet->ttl = sysctl_ip_default_ttl;
|
591 |
|
|
newinet->mc_loop = 1;
|
592 |
|
|
newinet->mc_ttl = 1;
|
593 |
|
|
newinet->mc_index = 0;
|
594 |
|
|
newinet->mc_list = NULL;
|
595 |
|
|
|
596 |
|
|
#ifdef INET_REFCNT_DEBUG
|
597 |
|
|
atomic_inc(&inet_sock_nr);
|
598 |
|
|
#endif
|
599 |
|
|
|
600 |
|
|
if (newsk->sk_prot->init(newsk)) {
|
601 |
|
|
inet_sock_release(newsk);
|
602 |
|
|
newsk = NULL;
|
603 |
|
|
}
|
604 |
|
|
|
605 |
|
|
out:
|
606 |
|
|
return newsk;
|
607 |
|
|
}
|
608 |
|
|
|
609 |
|
|
/* Map address, empty for v4 family */
|
610 |
|
|
static void sctp_v4_addr_v4map(struct sctp_opt *sp, union sctp_addr *addr)
|
611 |
|
|
{
|
612 |
|
|
/* Empty */
|
613 |
|
|
}
|
614 |
|
|
|
615 |
|
|
/* Dump the v4 addr to the seq file. */
|
616 |
|
|
static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
|
617 |
|
|
{
|
618 |
|
|
seq_printf(seq, "%d.%d.%d.%d ", NIPQUAD(addr->v4.sin_addr));
|
619 |
|
|
}
|
620 |
|
|
|
621 |
|
|
/* Event handler for inet address addition/deletion events.
|
622 |
|
|
* Basically, whenever there is an event, we re-build our local address list.
|
623 |
|
|
*/
|
624 |
|
|
static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev,
|
625 |
|
|
void *ptr)
|
626 |
|
|
{
|
627 |
|
|
unsigned long flags;
|
628 |
|
|
|
629 |
|
|
sctp_spin_lock_irqsave(&sctp_local_addr_lock, flags);
|
630 |
|
|
__sctp_free_local_addr_list();
|
631 |
|
|
__sctp_get_local_addr_list();
|
632 |
|
|
sctp_spin_unlock_irqrestore(&sctp_local_addr_lock, flags);
|
633 |
|
|
|
634 |
|
|
return NOTIFY_DONE;
|
635 |
|
|
}
|
636 |
|
|
|
637 |
|
|
/*
|
638 |
|
|
* Initialize the control inode/socket with a control endpoint data
|
639 |
|
|
* structure. This endpoint is reserved exclusively for the OOTB processing.
|
640 |
|
|
*/
|
641 |
|
|
int sctp_ctl_sock_init(void)
|
642 |
|
|
{
|
643 |
|
|
int err;
|
644 |
|
|
sa_family_t family;
|
645 |
|
|
|
646 |
|
|
if (sctp_get_pf_specific(PF_INET6))
|
647 |
|
|
family = PF_INET6;
|
648 |
|
|
else
|
649 |
|
|
family = PF_INET;
|
650 |
|
|
|
651 |
|
|
err = sock_create(family, SOCK_SEQPACKET, IPPROTO_SCTP,
|
652 |
|
|
&sctp_ctl_socket);
|
653 |
|
|
if (err < 0) {
|
654 |
|
|
printk(KERN_ERR
|
655 |
|
|
"SCTP: Failed to create the SCTP control socket.\n");
|
656 |
|
|
return err;
|
657 |
|
|
}
|
658 |
|
|
sctp_ctl_socket->sk->sk_allocation = GFP_ATOMIC;
|
659 |
|
|
inet_sk(sctp_ctl_socket->sk)->ttl = MAXTTL;
|
660 |
|
|
|
661 |
|
|
return 0;
|
662 |
|
|
}
|
663 |
|
|
|
664 |
|
|
/* Register address family specific functions. */
|
665 |
|
|
int sctp_register_af(struct sctp_af *af)
|
666 |
|
|
{
|
667 |
|
|
switch (af->sa_family) {
|
668 |
|
|
case AF_INET:
|
669 |
|
|
if (sctp_af_v4_specific)
|
670 |
|
|
return 0;
|
671 |
|
|
sctp_af_v4_specific = af;
|
672 |
|
|
break;
|
673 |
|
|
case AF_INET6:
|
674 |
|
|
if (sctp_af_v6_specific)
|
675 |
|
|
return 0;
|
676 |
|
|
sctp_af_v6_specific = af;
|
677 |
|
|
break;
|
678 |
|
|
default:
|
679 |
|
|
return 0;
|
680 |
|
|
}
|
681 |
|
|
|
682 |
|
|
INIT_LIST_HEAD(&af->list);
|
683 |
|
|
list_add_tail(&af->list, &sctp_address_families);
|
684 |
|
|
return 1;
|
685 |
|
|
}
|
686 |
|
|
|
687 |
|
|
/* Get the table of functions for manipulating a particular address
|
688 |
|
|
* family.
|
689 |
|
|
*/
|
690 |
|
|
struct sctp_af *sctp_get_af_specific(sa_family_t family)
|
691 |
|
|
{
|
692 |
|
|
switch (family) {
|
693 |
|
|
case AF_INET:
|
694 |
|
|
return sctp_af_v4_specific;
|
695 |
|
|
case AF_INET6:
|
696 |
|
|
return sctp_af_v6_specific;
|
697 |
|
|
default:
|
698 |
|
|
return NULL;
|
699 |
|
|
}
|
700 |
|
|
}
|
701 |
|
|
|
702 |
|
|
/* Common code to initialize a AF_INET msg_name. */
|
703 |
|
|
static void sctp_inet_msgname(char *msgname, int *addr_len)
|
704 |
|
|
{
|
705 |
|
|
struct sockaddr_in *sin;
|
706 |
|
|
|
707 |
|
|
sin = (struct sockaddr_in *)msgname;
|
708 |
|
|
*addr_len = sizeof(struct sockaddr_in);
|
709 |
|
|
sin->sin_family = AF_INET;
|
710 |
|
|
memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
|
711 |
|
|
}
|
712 |
|
|
|
713 |
|
|
/* Copy the primary address of the peer primary address as the msg_name. */
|
714 |
|
|
static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname,
|
715 |
|
|
int *addr_len)
|
716 |
|
|
{
|
717 |
|
|
struct sockaddr_in *sin, *sinfrom;
|
718 |
|
|
|
719 |
|
|
if (msgname) {
|
720 |
|
|
struct sctp_association *asoc;
|
721 |
|
|
|
722 |
|
|
asoc = event->sndrcvinfo.sinfo_assoc_id;
|
723 |
|
|
sctp_inet_msgname(msgname, addr_len);
|
724 |
|
|
sin = (struct sockaddr_in *)msgname;
|
725 |
|
|
sinfrom = &asoc->peer.primary_addr.v4;
|
726 |
|
|
sin->sin_port = htons(asoc->peer.port);
|
727 |
|
|
sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr;
|
728 |
|
|
}
|
729 |
|
|
}
|
730 |
|
|
|
731 |
|
|
/* Initialize and copy out a msgname from an inbound skb. */
|
732 |
|
|
static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len)
|
733 |
|
|
{
|
734 |
|
|
struct sctphdr *sh;
|
735 |
|
|
struct sockaddr_in *sin;
|
736 |
|
|
|
737 |
|
|
if (msgname) {
|
738 |
|
|
sctp_inet_msgname(msgname, len);
|
739 |
|
|
sin = (struct sockaddr_in *)msgname;
|
740 |
|
|
sh = (struct sctphdr *)skb->h.raw;
|
741 |
|
|
sin->sin_port = sh->source;
|
742 |
|
|
sin->sin_addr.s_addr = skb->nh.iph->saddr;
|
743 |
|
|
}
|
744 |
|
|
}
|
745 |
|
|
|
746 |
|
|
/* Do we support this AF? */
|
747 |
|
|
static int sctp_inet_af_supported(sa_family_t family, struct sctp_opt *sp)
|
748 |
|
|
{
|
749 |
|
|
/* PF_INET only supports AF_INET addresses. */
|
750 |
|
|
return (AF_INET == family);
|
751 |
|
|
}
|
752 |
|
|
|
753 |
|
|
/* Address matching with wildcards allowed. */
|
754 |
|
|
static int sctp_inet_cmp_addr(const union sctp_addr *addr1,
|
755 |
|
|
const union sctp_addr *addr2,
|
756 |
|
|
struct sctp_opt *opt)
|
757 |
|
|
{
|
758 |
|
|
/* PF_INET only supports AF_INET addresses. */
|
759 |
|
|
if (addr1->sa.sa_family != addr2->sa.sa_family)
|
760 |
|
|
return 0;
|
761 |
|
|
if (INADDR_ANY == addr1->v4.sin_addr.s_addr ||
|
762 |
|
|
INADDR_ANY == addr2->v4.sin_addr.s_addr)
|
763 |
|
|
return 1;
|
764 |
|
|
if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr)
|
765 |
|
|
return 1;
|
766 |
|
|
|
767 |
|
|
return 0;
|
768 |
|
|
}
|
769 |
|
|
|
770 |
|
|
/* Verify that provided sockaddr looks bindable. Common verification has
|
771 |
|
|
* already been taken care of.
|
772 |
|
|
*/
|
773 |
|
|
static int sctp_inet_bind_verify(struct sctp_opt *opt, union sctp_addr *addr)
|
774 |
|
|
{
|
775 |
|
|
return sctp_v4_available(addr, opt);
|
776 |
|
|
}
|
777 |
|
|
|
778 |
|
|
/* Verify that sockaddr looks sendable. Common verification has already
|
779 |
|
|
* been taken care of.
|
780 |
|
|
*/
|
781 |
|
|
static int sctp_inet_send_verify(struct sctp_opt *opt, union sctp_addr *addr)
|
782 |
|
|
{
|
783 |
|
|
return 1;
|
784 |
|
|
}
|
785 |
|
|
|
786 |
|
|
/* Fill in Supported Address Type information for INIT and INIT-ACK
|
787 |
|
|
* chunks. Returns number of addresses supported.
|
788 |
|
|
*/
|
789 |
|
|
static int sctp_inet_supported_addrs(const struct sctp_opt *opt,
|
790 |
|
|
__u16 *types)
|
791 |
|
|
{
|
792 |
|
|
types[0] = SCTP_PARAM_IPV4_ADDRESS;
|
793 |
|
|
return 1;
|
794 |
|
|
}
|
795 |
|
|
|
796 |
|
|
/* Wrapper routine that calls the ip transmit routine. */
|
797 |
|
|
static inline int sctp_v4_xmit(struct sk_buff *skb,
|
798 |
|
|
struct sctp_transport *transport, int ipfragok)
|
799 |
|
|
{
|
800 |
|
|
SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, "
|
801 |
|
|
"src:%u.%u.%u.%u, dst:%u.%u.%u.%u\n",
|
802 |
|
|
__FUNCTION__, skb, skb->len,
|
803 |
|
|
NIPQUAD(((struct rtable *)skb->dst)->rt_src),
|
804 |
|
|
NIPQUAD(((struct rtable *)skb->dst)->rt_dst));
|
805 |
|
|
|
806 |
|
|
SCTP_INC_STATS(SctpOutSCTPPacks);
|
807 |
|
|
return ip_queue_xmit(skb, ipfragok);
|
808 |
|
|
}
|
809 |
|
|
|
810 |
|
|
struct sctp_af sctp_ipv4_specific;
|
811 |
|
|
|
812 |
|
|
static struct sctp_pf sctp_pf_inet = {
|
813 |
|
|
.event_msgname = sctp_inet_event_msgname,
|
814 |
|
|
.skb_msgname = sctp_inet_skb_msgname,
|
815 |
|
|
.af_supported = sctp_inet_af_supported,
|
816 |
|
|
.cmp_addr = sctp_inet_cmp_addr,
|
817 |
|
|
.bind_verify = sctp_inet_bind_verify,
|
818 |
|
|
.send_verify = sctp_inet_send_verify,
|
819 |
|
|
.supported_addrs = sctp_inet_supported_addrs,
|
820 |
|
|
.create_accept_sk = sctp_v4_create_accept_sk,
|
821 |
|
|
.addr_v4map = sctp_v4_addr_v4map,
|
822 |
|
|
.af = &sctp_ipv4_specific,
|
823 |
|
|
};
|
824 |
|
|
|
825 |
|
|
/* Notifier for inetaddr addition/deletion events. */
|
826 |
|
|
struct notifier_block sctp_inetaddr_notifier = {
|
827 |
|
|
.notifier_call = sctp_inetaddr_event,
|
828 |
|
|
};
|
829 |
|
|
|
830 |
|
|
/* Socket operations. */
|
831 |
|
|
struct proto_ops inet_seqpacket_ops = {
|
832 |
|
|
.family = PF_INET,
|
833 |
|
|
.release = inet_release, /* Needs to be wrapped... */
|
834 |
|
|
.bind = inet_bind,
|
835 |
|
|
.connect = inet_dgram_connect,
|
836 |
|
|
.socketpair = sock_no_socketpair,
|
837 |
|
|
.accept = inet_accept,
|
838 |
|
|
.getname = inet_getname, /* Semantics are different. */
|
839 |
|
|
.poll = sctp_poll,
|
840 |
|
|
.ioctl = inet_ioctl,
|
841 |
|
|
.listen = sctp_inet_listen,
|
842 |
|
|
.shutdown = inet_shutdown, /* Looks harmless. */
|
843 |
|
|
.setsockopt = inet_setsockopt, /* IP_SOL IP_OPTION is a problem. */
|
844 |
|
|
.getsockopt = inet_getsockopt,
|
845 |
|
|
.sendmsg = inet_sendmsg,
|
846 |
|
|
.recvmsg = inet_recvmsg,
|
847 |
|
|
.mmap = sock_no_mmap,
|
848 |
|
|
.sendpage = sock_no_sendpage,
|
849 |
|
|
};
|
850 |
|
|
|
851 |
|
|
/* Registration with AF_INET family. */
|
852 |
|
|
static struct inet_protosw sctp_seqpacket_protosw = {
|
853 |
|
|
.type = SOCK_SEQPACKET,
|
854 |
|
|
.protocol = IPPROTO_SCTP,
|
855 |
|
|
.prot = &sctp_prot,
|
856 |
|
|
.ops = &inet_seqpacket_ops,
|
857 |
|
|
.capability = -1,
|
858 |
|
|
.no_check = 0,
|
859 |
|
|
.flags = SCTP_PROTOSW_FLAG
|
860 |
|
|
};
|
861 |
|
|
static struct inet_protosw sctp_stream_protosw = {
|
862 |
|
|
.type = SOCK_STREAM,
|
863 |
|
|
.protocol = IPPROTO_SCTP,
|
864 |
|
|
.prot = &sctp_prot,
|
865 |
|
|
.ops = &inet_seqpacket_ops,
|
866 |
|
|
.capability = -1,
|
867 |
|
|
.no_check = 0,
|
868 |
|
|
.flags = SCTP_PROTOSW_FLAG
|
869 |
|
|
};
|
870 |
|
|
|
871 |
|
|
/* Register with IP layer. */
|
872 |
|
|
static struct inet_protocol sctp_protocol = {
|
873 |
|
|
.handler = sctp_rcv,
|
874 |
|
|
.err_handler = sctp_v4_err,
|
875 |
|
|
.protocol = IPPROTO_SCTP,
|
876 |
|
|
.name = "SCTP"
|
877 |
|
|
};
|
878 |
|
|
|
879 |
|
|
/* IPv4 address related functions. */
|
880 |
|
|
struct sctp_af sctp_ipv4_specific = {
|
881 |
|
|
.sctp_xmit = sctp_v4_xmit,
|
882 |
|
|
.setsockopt = ip_setsockopt,
|
883 |
|
|
.getsockopt = ip_getsockopt,
|
884 |
|
|
.get_dst = sctp_v4_get_dst,
|
885 |
|
|
.get_saddr = sctp_v4_get_saddr,
|
886 |
|
|
.copy_addrlist = sctp_v4_copy_addrlist,
|
887 |
|
|
.from_skb = sctp_v4_from_skb,
|
888 |
|
|
.from_sk = sctp_v4_from_sk,
|
889 |
|
|
.to_sk_saddr = sctp_v4_to_sk_saddr,
|
890 |
|
|
.to_sk_daddr = sctp_v4_to_sk_daddr,
|
891 |
|
|
.from_addr_param= sctp_v4_from_addr_param,
|
892 |
|
|
.to_addr_param = sctp_v4_to_addr_param,
|
893 |
|
|
.dst_saddr = sctp_v4_dst_saddr,
|
894 |
|
|
.cmp_addr = sctp_v4_cmp_addr,
|
895 |
|
|
.addr_valid = sctp_v4_addr_valid,
|
896 |
|
|
.inaddr_any = sctp_v4_inaddr_any,
|
897 |
|
|
.is_any = sctp_v4_is_any,
|
898 |
|
|
.available = sctp_v4_available,
|
899 |
|
|
.scope = sctp_v4_scope,
|
900 |
|
|
.skb_iif = sctp_v4_skb_iif,
|
901 |
|
|
.is_ce = sctp_v4_is_ce,
|
902 |
|
|
.seq_dump_addr = sctp_v4_seq_dump_addr,
|
903 |
|
|
.net_header_len = sizeof(struct iphdr),
|
904 |
|
|
.sockaddr_len = sizeof(struct sockaddr_in),
|
905 |
|
|
.sa_family = AF_INET,
|
906 |
|
|
};
|
907 |
|
|
|
908 |
|
|
struct sctp_pf *sctp_get_pf_specific(sa_family_t family) {
|
909 |
|
|
|
910 |
|
|
switch (family) {
|
911 |
|
|
case PF_INET:
|
912 |
|
|
return sctp_pf_inet_specific;
|
913 |
|
|
case PF_INET6:
|
914 |
|
|
return sctp_pf_inet6_specific;
|
915 |
|
|
default:
|
916 |
|
|
return NULL;
|
917 |
|
|
}
|
918 |
|
|
}
|
919 |
|
|
|
920 |
|
|
/* Register the PF specific function table. */
|
921 |
|
|
int sctp_register_pf(struct sctp_pf *pf, sa_family_t family)
|
922 |
|
|
{
|
923 |
|
|
switch (family) {
|
924 |
|
|
case PF_INET:
|
925 |
|
|
if (sctp_pf_inet_specific)
|
926 |
|
|
return 0;
|
927 |
|
|
sctp_pf_inet_specific = pf;
|
928 |
|
|
break;
|
929 |
|
|
case PF_INET6:
|
930 |
|
|
if (sctp_pf_inet6_specific)
|
931 |
|
|
return 0;
|
932 |
|
|
sctp_pf_inet6_specific = pf;
|
933 |
|
|
break;
|
934 |
|
|
default:
|
935 |
|
|
return 0;
|
936 |
|
|
}
|
937 |
|
|
return 1;
|
938 |
|
|
}
|
939 |
|
|
|
940 |
|
|
static int __init init_sctp_mibs(void)
|
941 |
|
|
{
|
942 |
|
|
return 0;
|
943 |
|
|
}
|
944 |
|
|
|
945 |
|
|
static void cleanup_sctp_mibs(void)
|
946 |
|
|
{
|
947 |
|
|
return;
|
948 |
|
|
}
|
949 |
|
|
|
950 |
|
|
/* Initialize the universe into something sensible. */
|
951 |
|
|
__init int sctp_init(void)
|
952 |
|
|
{
|
953 |
|
|
int i;
|
954 |
|
|
int status = 0;
|
955 |
|
|
unsigned long goal;
|
956 |
|
|
int order;
|
957 |
|
|
|
958 |
|
|
/* SCTP_DEBUG sanity check. */
|
959 |
|
|
if (!sctp_sanity_check())
|
960 |
|
|
return -EINVAL;
|
961 |
|
|
|
962 |
|
|
/* Add SCTP to inet_protos hash table. */
|
963 |
|
|
inet_add_protocol(&sctp_protocol);
|
964 |
|
|
|
965 |
|
|
/* Add SCTP(TCP and UDP style) to inetsw linked list. */
|
966 |
|
|
inet_register_protosw(&sctp_seqpacket_protosw);
|
967 |
|
|
inet_register_protosw(&sctp_stream_protosw);
|
968 |
|
|
|
969 |
|
|
/* Allocate cache pools. */
|
970 |
|
|
sctp_chunk_cachep = kmem_cache_create("sctp_chunk",
|
971 |
|
|
sizeof(struct sctp_chunk),
|
972 |
|
|
0, SLAB_HWCACHE_ALIGN,
|
973 |
|
|
NULL, NULL);
|
974 |
|
|
if (!sctp_chunk_cachep)
|
975 |
|
|
goto err_chunk_cachep;
|
976 |
|
|
|
977 |
|
|
/* Allocate and initialise sctp mibs. */
|
978 |
|
|
status = init_sctp_mibs();
|
979 |
|
|
if (status)
|
980 |
|
|
goto err_init_mibs;
|
981 |
|
|
|
982 |
|
|
/* Initialize proc fs directory. */
|
983 |
|
|
sctp_proc_init();
|
984 |
|
|
|
985 |
|
|
/* Initialize object count debugging. */
|
986 |
|
|
sctp_dbg_objcnt_init();
|
987 |
|
|
|
988 |
|
|
/* Initialize the SCTP specific PF functions. */
|
989 |
|
|
sctp_register_pf(&sctp_pf_inet, PF_INET);
|
990 |
|
|
/*
|
991 |
|
|
* 14. Suggested SCTP Protocol Parameter Values
|
992 |
|
|
*/
|
993 |
|
|
/* The following protocol parameters are RECOMMENDED: */
|
994 |
|
|
/* RTO.Initial - 3 seconds */
|
995 |
|
|
sctp_rto_initial = SCTP_RTO_INITIAL;
|
996 |
|
|
/* RTO.Min - 1 second */
|
997 |
|
|
sctp_rto_min = SCTP_RTO_MIN;
|
998 |
|
|
/* RTO.Max - 60 seconds */
|
999 |
|
|
sctp_rto_max = SCTP_RTO_MAX;
|
1000 |
|
|
/* RTO.Alpha - 1/8 */
|
1001 |
|
|
sctp_rto_alpha = SCTP_RTO_ALPHA;
|
1002 |
|
|
/* RTO.Beta - 1/4 */
|
1003 |
|
|
sctp_rto_beta = SCTP_RTO_BETA;
|
1004 |
|
|
/* Valid.Cookie.Life - 60 seconds */
|
1005 |
|
|
sctp_valid_cookie_life = 60 * HZ;
|
1006 |
|
|
|
1007 |
|
|
/* Whether Cookie Preservative is enabled(1) or not(0) */
|
1008 |
|
|
sctp_cookie_preserve_enable = 1;
|
1009 |
|
|
|
1010 |
|
|
/* Max.Burst - 4 */
|
1011 |
|
|
sctp_max_burst = SCTP_MAX_BURST;
|
1012 |
|
|
|
1013 |
|
|
/* Association.Max.Retrans - 10 attempts
|
1014 |
|
|
* Path.Max.Retrans - 5 attempts (per destination address)
|
1015 |
|
|
* Max.Init.Retransmits - 8 attempts
|
1016 |
|
|
*/
|
1017 |
|
|
sctp_max_retrans_association = 10;
|
1018 |
|
|
sctp_max_retrans_path = 5;
|
1019 |
|
|
sctp_max_retrans_init = 8;
|
1020 |
|
|
|
1021 |
|
|
/* HB.interval - 30 seconds */
|
1022 |
|
|
sctp_hb_interval = 30 * HZ;
|
1023 |
|
|
|
1024 |
|
|
/* Implementation specific variables. */
|
1025 |
|
|
|
1026 |
|
|
/* Initialize default stream count setup information. */
|
1027 |
|
|
sctp_max_instreams = SCTP_DEFAULT_INSTREAMS;
|
1028 |
|
|
sctp_max_outstreams = SCTP_DEFAULT_OUTSTREAMS;
|
1029 |
|
|
|
1030 |
|
|
/* Size and allocate the association hash table.
|
1031 |
|
|
* The methodology is similar to that of the tcp hash tables.
|
1032 |
|
|
*/
|
1033 |
|
|
if (num_physpages >= (128 * 1024))
|
1034 |
|
|
goal = num_physpages >> (22 - PAGE_SHIFT);
|
1035 |
|
|
else
|
1036 |
|
|
goal = num_physpages >> (24 - PAGE_SHIFT);
|
1037 |
|
|
|
1038 |
|
|
for (order = 0; (1UL << order) < goal; order++)
|
1039 |
|
|
;
|
1040 |
|
|
|
1041 |
|
|
do {
|
1042 |
|
|
sctp_assoc_hashsize = (1UL << order) * PAGE_SIZE /
|
1043 |
|
|
sizeof(struct sctp_hashbucket);
|
1044 |
|
|
if ((sctp_assoc_hashsize > (64 * 1024)) && order > 0)
|
1045 |
|
|
continue;
|
1046 |
|
|
sctp_assoc_hashtable = (struct sctp_hashbucket *)
|
1047 |
|
|
__get_free_pages(GFP_ATOMIC, order);
|
1048 |
|
|
} while (!sctp_assoc_hashtable && --order > 0);
|
1049 |
|
|
if (!sctp_assoc_hashtable) {
|
1050 |
|
|
printk(KERN_ERR "SCTP: Failed association hash alloc.\n");
|
1051 |
|
|
status = -ENOMEM;
|
1052 |
|
|
goto err_ahash_alloc;
|
1053 |
|
|
}
|
1054 |
|
|
for (i = 0; i < sctp_assoc_hashsize; i++) {
|
1055 |
|
|
sctp_assoc_hashtable[i].lock = RW_LOCK_UNLOCKED;
|
1056 |
|
|
sctp_assoc_hashtable[i].chain = NULL;
|
1057 |
|
|
}
|
1058 |
|
|
|
1059 |
|
|
/* Allocate and initialize the endpoint hash table. */
|
1060 |
|
|
sctp_ep_hashsize = 64;
|
1061 |
|
|
sctp_ep_hashtable = (struct sctp_hashbucket *)
|
1062 |
|
|
kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL);
|
1063 |
|
|
if (!sctp_ep_hashtable) {
|
1064 |
|
|
printk(KERN_ERR "SCTP: Failed endpoint_hash alloc.\n");
|
1065 |
|
|
status = -ENOMEM;
|
1066 |
|
|
goto err_ehash_alloc;
|
1067 |
|
|
}
|
1068 |
|
|
for (i = 0; i < sctp_ep_hashsize; i++) {
|
1069 |
|
|
sctp_ep_hashtable[i].lock = RW_LOCK_UNLOCKED;
|
1070 |
|
|
sctp_ep_hashtable[i].chain = NULL;
|
1071 |
|
|
}
|
1072 |
|
|
|
1073 |
|
|
/* Allocate and initialize the SCTP port hash table. */
|
1074 |
|
|
do {
|
1075 |
|
|
sctp_port_hashsize = (1UL << order) * PAGE_SIZE /
|
1076 |
|
|
sizeof(struct sctp_bind_hashbucket);
|
1077 |
|
|
if ((sctp_port_hashsize > (64 * 1024)) && order > 0)
|
1078 |
|
|
continue;
|
1079 |
|
|
sctp_port_hashtable = (struct sctp_bind_hashbucket *)
|
1080 |
|
|
__get_free_pages(GFP_ATOMIC, order);
|
1081 |
|
|
} while (!sctp_port_hashtable && --order > 0);
|
1082 |
|
|
if (!sctp_port_hashtable) {
|
1083 |
|
|
printk(KERN_ERR "SCTP: Failed bind hash alloc.");
|
1084 |
|
|
status = -ENOMEM;
|
1085 |
|
|
goto err_bhash_alloc;
|
1086 |
|
|
}
|
1087 |
|
|
for (i = 0; i < sctp_port_hashsize; i++) {
|
1088 |
|
|
sctp_port_hashtable[i].lock = SPIN_LOCK_UNLOCKED;
|
1089 |
|
|
sctp_port_hashtable[i].chain = NULL;
|
1090 |
|
|
}
|
1091 |
|
|
|
1092 |
|
|
sctp_port_alloc_lock = SPIN_LOCK_UNLOCKED;
|
1093 |
|
|
sctp_port_rover = sysctl_local_port_range[0] - 1;
|
1094 |
|
|
|
1095 |
|
|
printk(KERN_INFO "SCTP: Hash tables configured "
|
1096 |
|
|
"(established %d bind %d)\n",
|
1097 |
|
|
sctp_assoc_hashsize, sctp_port_hashsize);
|
1098 |
|
|
|
1099 |
|
|
/* Disable ADDIP by default. */
|
1100 |
|
|
sctp_addip_enable = 0;
|
1101 |
|
|
|
1102 |
|
|
sctp_sysctl_register();
|
1103 |
|
|
|
1104 |
|
|
INIT_LIST_HEAD(&sctp_address_families);
|
1105 |
|
|
sctp_register_af(&sctp_ipv4_specific);
|
1106 |
|
|
|
1107 |
|
|
status = sctp_v6_init();
|
1108 |
|
|
if (status)
|
1109 |
|
|
goto err_v6_init;
|
1110 |
|
|
|
1111 |
|
|
/* Initialize the control inode/socket for handling OOTB packets. */
|
1112 |
|
|
if ((status = sctp_ctl_sock_init())) {
|
1113 |
|
|
printk (KERN_ERR
|
1114 |
|
|
"SCTP: Failed to initialize the SCTP control sock.\n");
|
1115 |
|
|
goto err_ctl_sock_init;
|
1116 |
|
|
}
|
1117 |
|
|
|
1118 |
|
|
/* Initialize the local address list. */
|
1119 |
|
|
INIT_LIST_HEAD(&sctp_local_addr_list);
|
1120 |
|
|
sctp_local_addr_lock = SPIN_LOCK_UNLOCKED;
|
1121 |
|
|
|
1122 |
|
|
/* Register notifier for inet address additions/deletions. */
|
1123 |
|
|
register_inetaddr_notifier(&sctp_inetaddr_notifier);
|
1124 |
|
|
|
1125 |
|
|
sctp_get_local_addr_list();
|
1126 |
|
|
|
1127 |
|
|
__unsafe(THIS_MODULE);
|
1128 |
|
|
return 0;
|
1129 |
|
|
|
1130 |
|
|
err_ctl_sock_init:
|
1131 |
|
|
sctp_v6_exit();
|
1132 |
|
|
err_v6_init:
|
1133 |
|
|
sctp_sysctl_unregister();
|
1134 |
|
|
list_del(&sctp_ipv4_specific.list);
|
1135 |
|
|
free_pages((unsigned long)sctp_port_hashtable,
|
1136 |
|
|
get_order(sctp_port_hashsize *
|
1137 |
|
|
sizeof(struct sctp_bind_hashbucket)));
|
1138 |
|
|
err_bhash_alloc:
|
1139 |
|
|
kfree(sctp_ep_hashtable);
|
1140 |
|
|
err_ehash_alloc:
|
1141 |
|
|
free_pages((unsigned long)sctp_assoc_hashtable,
|
1142 |
|
|
get_order(sctp_assoc_hashsize *
|
1143 |
|
|
sizeof(struct sctp_hashbucket)));
|
1144 |
|
|
err_ahash_alloc:
|
1145 |
|
|
sctp_dbg_objcnt_exit();
|
1146 |
|
|
sctp_proc_exit();
|
1147 |
|
|
cleanup_sctp_mibs();
|
1148 |
|
|
err_init_mibs:
|
1149 |
|
|
kmem_cache_destroy(sctp_chunk_cachep);
|
1150 |
|
|
err_chunk_cachep:
|
1151 |
|
|
inet_del_protocol(&sctp_protocol);
|
1152 |
|
|
inet_unregister_protosw(&sctp_seqpacket_protosw);
|
1153 |
|
|
inet_unregister_protosw(&sctp_stream_protosw);
|
1154 |
|
|
return status;
|
1155 |
|
|
}
|
1156 |
|
|
|
1157 |
|
|
/* Exit handler for the SCTP protocol. */
|
1158 |
|
|
__exit void sctp_exit(void)
|
1159 |
|
|
{
|
1160 |
|
|
/* BUG. This should probably do something useful like clean
|
1161 |
|
|
* up all the remaining associations and all that memory.
|
1162 |
|
|
*/
|
1163 |
|
|
|
1164 |
|
|
/* Unregister notifier for inet address additions/deletions. */
|
1165 |
|
|
unregister_inetaddr_notifier(&sctp_inetaddr_notifier);
|
1166 |
|
|
|
1167 |
|
|
/* Free the local address list. */
|
1168 |
|
|
sctp_free_local_addr_list();
|
1169 |
|
|
|
1170 |
|
|
/* Free the control endpoint. */
|
1171 |
|
|
sock_release(sctp_ctl_socket);
|
1172 |
|
|
|
1173 |
|
|
sctp_v6_exit();
|
1174 |
|
|
sctp_sysctl_unregister();
|
1175 |
|
|
list_del(&sctp_ipv4_specific.list);
|
1176 |
|
|
|
1177 |
|
|
free_pages((unsigned long)sctp_assoc_hashtable,
|
1178 |
|
|
get_order(sctp_assoc_hashsize *
|
1179 |
|
|
sizeof(struct sctp_hashbucket)));
|
1180 |
|
|
kfree(sctp_ep_hashtable);
|
1181 |
|
|
free_pages((unsigned long)sctp_port_hashtable,
|
1182 |
|
|
get_order(sctp_port_hashsize *
|
1183 |
|
|
sizeof(struct sctp_bind_hashbucket)));
|
1184 |
|
|
|
1185 |
|
|
kmem_cache_destroy(sctp_chunk_cachep);
|
1186 |
|
|
|
1187 |
|
|
sctp_dbg_objcnt_exit();
|
1188 |
|
|
sctp_proc_exit();
|
1189 |
|
|
cleanup_sctp_mibs();
|
1190 |
|
|
|
1191 |
|
|
inet_del_protocol(&sctp_protocol);
|
1192 |
|
|
inet_unregister_protosw(&sctp_seqpacket_protosw);
|
1193 |
|
|
inet_unregister_protosw(&sctp_stream_protosw);
|
1194 |
|
|
}
|
1195 |
|
|
|
1196 |
|
|
module_init(sctp_init);
|
1197 |
|
|
module_exit(sctp_exit);
|
1198 |
|
|
|
1199 |
|
|
MODULE_AUTHOR("Linux Kernel SCTP developers <lksctp-developers@lists.sourceforge.net>");
|
1200 |
|
|
MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)");
|
1201 |
|
|
MODULE_LICENSE("GPL");
|