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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 | /* * NET/ROM release 003 * * 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 1.2.1 or higher/ NET3.029 * * 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 * NET/ROM 001 Jonathan(G4KLX) Cloned from ax25_timer.c */ #include <linux/config.h> #ifdef CONFIG_NETROM #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 <net/ax25.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/netrom.h> static void nr_timer(unsigned long); /* * Linux set/reset timer routines */ void nr_set_timer(struct sock *sk) { unsigned long flags; save_flags(flags); cli(); del_timer(&sk->timer); restore_flags(flags); sk->timer.next = sk->timer.prev = NULL; sk->timer.data = (unsigned long)sk; sk->timer.function = &nr_timer; sk->timer.expires = jiffies+10; add_timer(&sk->timer); } static void nr_reset_timer(struct sock *sk) { unsigned long flags; save_flags(flags); cli(); del_timer(&sk->timer); restore_flags(flags); sk->timer.data = (unsigned long)sk; sk->timer.function = &nr_timer; sk->timer.expires = jiffies+10; add_timer(&sk->timer); } /* * NET/ROM TIMER * * This routine is called every 500ms. Decrement timer by this * amount - if expired then process the event. */ static void nr_timer(unsigned long param) { struct sock *sk = (struct sock *)param; switch (sk->nr->state) { case NR_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)) { del_timer(&sk->timer); nr_destroy_socket(sk); return; } break; case NR_STATE_3: /* * Check for the state of the receive buffer. */ if (sk->rmem_alloc < (sk->rcvbuf / 2) && (sk->nr->condition & OWN_RX_BUSY_CONDITION)) { sk->nr->condition &= ~OWN_RX_BUSY_CONDITION; nr_write_internal(sk, NR_INFOACK); sk->nr->condition &= ~ACK_PENDING_CONDITION; sk->nr->vl = sk->nr->vr; break; } /* * Check for frames to transmit. */ nr_kick(sk); break; default: break; } if (sk->nr->t2timer > 0 && --sk->nr->t2timer == 0) { if (sk->nr->state == NR_STATE_3) { if (sk->nr->condition & ACK_PENDING_CONDITION) { sk->nr->condition &= ~ACK_PENDING_CONDITION; nr_enquiry_response(sk); } } } if (sk->nr->t4timer > 0 && --sk->nr->t4timer == 0) { sk->nr->condition &= ~PEER_RX_BUSY_CONDITION; } if (sk->nr->t1timer == 0 || --sk->nr->t1timer > 0) { nr_reset_timer(sk); return; } switch (sk->nr->state) { case NR_STATE_1: if (sk->nr->n2count == sk->nr->n2) { nr_clear_queues(sk); sk->nr->state = NR_STATE_0; sk->state = TCP_CLOSE; sk->err = ETIMEDOUT; if (!sk->dead) sk->state_change(sk); sk->dead = 1; } else { sk->nr->n2count++; nr_write_internal(sk, NR_CONNREQ); } break; case NR_STATE_2: if (sk->nr->n2count == sk->nr->n2) { nr_clear_queues(sk); sk->nr->state = NR_STATE_0; sk->state = TCP_CLOSE; sk->err = ETIMEDOUT; if (!sk->dead) sk->state_change(sk); sk->dead = 1; } else { sk->nr->n2count++; nr_write_internal(sk, NR_DISCREQ); } break; case NR_STATE_3: if (sk->nr->n2count == sk->nr->n2) { nr_clear_queues(sk); sk->nr->state = NR_STATE_0; sk->state = TCP_CLOSE; sk->err = ETIMEDOUT; if (!sk->dead) sk->state_change(sk); sk->dead = 1; } else { sk->nr->n2count++; nr_requeue_frames(sk); } break; } sk->nr->t1timer = sk->nr->t1 = nr_calculate_t1(sk); nr_set_timer(sk); } #endif |