^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 2002 Ralf Baechle DO1GRB (ralf@gnu.org)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/socket.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/in.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/jiffies.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/timer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/sockios.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/net.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <net/ax25.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/inet.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/netdevice.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/skbuff.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <net/sock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <net/tcp_states.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <linux/fcntl.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include <net/rose.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) static void rose_heartbeat_expiry(struct timer_list *t);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) static void rose_timer_expiry(struct timer_list *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) static void rose_idletimer_expiry(struct timer_list *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) void rose_start_heartbeat(struct sock *sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) del_timer(&sk->sk_timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) sk->sk_timer.function = rose_heartbeat_expiry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) sk->sk_timer.expires = jiffies + 5 * HZ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) add_timer(&sk->sk_timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) void rose_start_t1timer(struct sock *sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) struct rose_sock *rose = rose_sk(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) del_timer(&rose->timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) rose->timer.function = rose_timer_expiry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) rose->timer.expires = jiffies + rose->t1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) add_timer(&rose->timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) void rose_start_t2timer(struct sock *sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) struct rose_sock *rose = rose_sk(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) del_timer(&rose->timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) rose->timer.function = rose_timer_expiry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) rose->timer.expires = jiffies + rose->t2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) add_timer(&rose->timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) void rose_start_t3timer(struct sock *sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) struct rose_sock *rose = rose_sk(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) del_timer(&rose->timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) rose->timer.function = rose_timer_expiry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) rose->timer.expires = jiffies + rose->t3;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) add_timer(&rose->timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) void rose_start_hbtimer(struct sock *sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) struct rose_sock *rose = rose_sk(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) del_timer(&rose->timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) rose->timer.function = rose_timer_expiry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) rose->timer.expires = jiffies + rose->hb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) add_timer(&rose->timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) void rose_start_idletimer(struct sock *sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) struct rose_sock *rose = rose_sk(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) del_timer(&rose->idletimer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) if (rose->idle > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) rose->idletimer.function = rose_idletimer_expiry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) rose->idletimer.expires = jiffies + rose->idle;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) add_timer(&rose->idletimer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) void rose_stop_heartbeat(struct sock *sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) del_timer(&sk->sk_timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) void rose_stop_timer(struct sock *sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) del_timer(&rose_sk(sk)->timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) void rose_stop_idletimer(struct sock *sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) del_timer(&rose_sk(sk)->idletimer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) static void rose_heartbeat_expiry(struct timer_list *t)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) struct sock *sk = from_timer(sk, t, sk_timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) struct rose_sock *rose = rose_sk(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) bh_lock_sock(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) switch (rose->state) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) case ROSE_STATE_0:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) /* Magic here: If we listen() and a new link dies before it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) is accepted() it isn't 'dead' so doesn't get removed. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) if (sock_flag(sk, SOCK_DESTROY) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) (sk->sk_state == TCP_LISTEN && sock_flag(sk, SOCK_DEAD))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) bh_unlock_sock(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) rose_destroy_socket(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) case ROSE_STATE_3:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) * Check for the state of the receive buffer.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) if (atomic_read(&sk->sk_rmem_alloc) < (sk->sk_rcvbuf / 2) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) (rose->condition & ROSE_COND_OWN_RX_BUSY)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) rose->condition &= ~ROSE_COND_OWN_RX_BUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) rose->condition &= ~ROSE_COND_ACK_PENDING;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) rose->vl = rose->vr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) rose_write_internal(sk, ROSE_RR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) rose_stop_timer(sk); /* HB */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) rose_start_heartbeat(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) bh_unlock_sock(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) static void rose_timer_expiry(struct timer_list *t)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) struct rose_sock *rose = from_timer(rose, t, timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) struct sock *sk = &rose->sock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) bh_lock_sock(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) switch (rose->state) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) case ROSE_STATE_1: /* T1 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) case ROSE_STATE_4: /* T2 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) rose_write_internal(sk, ROSE_CLEAR_REQUEST);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) rose->state = ROSE_STATE_2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) rose_start_t3timer(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) case ROSE_STATE_2: /* T3 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) rose->neighbour->use--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) rose_disconnect(sk, ETIMEDOUT, -1, -1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) case ROSE_STATE_3: /* HB */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) if (rose->condition & ROSE_COND_ACK_PENDING) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) rose->condition &= ~ROSE_COND_ACK_PENDING;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) rose_enquiry_response(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) bh_unlock_sock(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) static void rose_idletimer_expiry(struct timer_list *t)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) struct rose_sock *rose = from_timer(rose, t, idletimer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) struct sock *sk = &rose->sock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) bh_lock_sock(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) rose_clear_queues(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) rose_write_internal(sk, ROSE_CLEAR_REQUEST);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) rose_sk(sk)->state = ROSE_STATE_2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) rose_start_t3timer(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) sk->sk_state = TCP_CLOSE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) sk->sk_err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) sk->sk_shutdown |= SEND_SHUTDOWN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) if (!sock_flag(sk, SOCK_DEAD)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) sk->sk_state_change(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) sock_set_flag(sk, SOCK_DEAD);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) bh_unlock_sock(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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