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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 | /* * X.25 Packet Layer release 002 * * This is ALPHA test software. This code may break your machine, randomly fail to work with new * releases, misbehave and/or generally screw up. It might even work. * * This code REQUIRES 2.1.15 or higher * * This module: * This module is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. * * History * X.25 001 Jonathan Naylor Started coding. * X.25 002 Jonathan Naylor New timer architecture. * Centralised disconnection processing. */ #include <linux/errno.h> #include <linux/types.h> #include <linux/socket.h> #include <linux/in.h> #include <linux/kernel.h> #include <linux/sched.h> #include <linux/timer.h> #include <linux/string.h> #include <linux/sockios.h> #include <linux/net.h> #include <linux/inet.h> #include <linux/netdevice.h> #include <linux/skbuff.h> #include <net/sock.h> #include <asm/segment.h> #include <asm/system.h> #include <linux/fcntl.h> #include <linux/mm.h> #include <linux/interrupt.h> #include <net/x25.h> static void x25_heartbeat_expiry(unsigned long); static void x25_timer_expiry(unsigned long); void x25_start_heartbeat(struct sock *sk) { del_timer(&sk->timer); sk->timer.data = (unsigned long)sk; sk->timer.function = &x25_heartbeat_expiry; sk->timer.expires = jiffies + 5 * HZ; add_timer(&sk->timer); } void x25_stop_heartbeat(struct sock *sk) { del_timer(&sk->timer); } void x25_start_t2timer(struct sock *sk) { del_timer(&sk->protinfo.x25->timer); sk->protinfo.x25->timer.data = (unsigned long)sk; sk->protinfo.x25->timer.function = &x25_timer_expiry; sk->protinfo.x25->timer.expires = jiffies + sk->protinfo.x25->t2; add_timer(&sk->protinfo.x25->timer); } void x25_start_t21timer(struct sock *sk) { del_timer(&sk->protinfo.x25->timer); sk->protinfo.x25->timer.data = (unsigned long)sk; sk->protinfo.x25->timer.function = &x25_timer_expiry; sk->protinfo.x25->timer.expires = jiffies + sk->protinfo.x25->t21; add_timer(&sk->protinfo.x25->timer); } void x25_start_t22timer(struct sock *sk) { del_timer(&sk->protinfo.x25->timer); sk->protinfo.x25->timer.data = (unsigned long)sk; sk->protinfo.x25->timer.function = &x25_timer_expiry; sk->protinfo.x25->timer.expires = jiffies + sk->protinfo.x25->t22; add_timer(&sk->protinfo.x25->timer); } void x25_start_t23timer(struct sock *sk) { del_timer(&sk->protinfo.x25->timer); sk->protinfo.x25->timer.data = (unsigned long)sk; sk->protinfo.x25->timer.function = &x25_timer_expiry; sk->protinfo.x25->timer.expires = jiffies + sk->protinfo.x25->t23; add_timer(&sk->protinfo.x25->timer); } void x25_stop_timer(struct sock *sk) { del_timer(&sk->protinfo.x25->timer); } unsigned long x25_display_timer(struct sock *sk) { if (!timer_pending(&sk->protinfo.x25->timer)) return 0; return sk->protinfo.x25->timer.expires - jiffies; } static void x25_heartbeat_expiry(unsigned long param) { struct sock *sk = (struct sock *)param; bh_lock_sock(sk); if (sk->lock.users) { /* can currently only occur in state 3 */ goto restart_heartbeat; } switch (sk->protinfo.x25->state) { case X25_STATE_0: /* Magic here: If we listen() and a new link dies before it is accepted() it isn't 'dead' so doesn't get removed. */ if (sk->destroy || (sk->state == TCP_LISTEN && sk->dead)) { x25_destroy_socket(sk); goto unlock; } break; case X25_STATE_3: /* * Check for the state of the receive buffer. */ x25_check_rbuf(sk); break; } restart_heartbeat: x25_start_heartbeat(sk); unlock: bh_unlock_sock(sk); } /* * Timer has expired, it may have been T2, T21, T22, or T23. We can tell * by the state machine state. */ static inline void x25_do_timer_expiry(struct sock * sk) { switch (sk->protinfo.x25->state) { case X25_STATE_3: /* T2 */ if (sk->protinfo.x25->condition & X25_COND_ACK_PENDING) { sk->protinfo.x25->condition &= ~X25_COND_ACK_PENDING; x25_enquiry_response(sk); } break; case X25_STATE_1: /* T21 */ case X25_STATE_4: /* T22 */ x25_write_internal(sk, X25_CLEAR_REQUEST); sk->protinfo.x25->state = X25_STATE_2; x25_start_t23timer(sk); break; case X25_STATE_2: /* T23 */ x25_disconnect(sk, ETIMEDOUT, 0, 0); break; } } static void x25_timer_expiry(unsigned long param) { struct sock *sk = (struct sock *)param; bh_lock_sock(sk); if (sk->lock.users) { /* can currently only occur in state 3 */ if (sk->protinfo.x25->state == X25_STATE_3) { x25_start_t2timer(sk); } } else { x25_do_timer_expiry(sk); } bh_unlock_sock(sk); } |