/* * This program 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. * * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk) */ #include <linux/errno.h> #include <linux/types.h> #include <linux/socket.h> #include <linux/in.h> #include <linux/kernel.h> #include <linux/jiffies.h> #include <linux/timer.h> #include <linux/string.h> #include <linux/sockios.h> #include <linux/net.h> #include <linux/slab.h> #include <net/ax25.h> #include <linux/inet.h> #include <linux/netdevice.h> #include <linux/skbuff.h> #include <net/sock.h> #include <linux/fcntl.h> #include <linux/mm.h> #include <linux/interrupt.h> #include <net/rose.h> static void rose_ftimer_expiry(struct timer_list *); static void rose_t0timer_expiry(struct timer_list *); static void rose_transmit_restart_confirmation(struct rose_neigh *neigh); static void rose_transmit_restart_request(struct rose_neigh *neigh); void rose_start_ftimer(struct rose_neigh *neigh) { del_timer(&neigh->ftimer); neigh->ftimer.function = rose_ftimer_expiry; neigh->ftimer.expires = jiffies + msecs_to_jiffies(sysctl_rose_link_fail_timeout); add_timer(&neigh->ftimer); } static void rose_start_t0timer(struct rose_neigh *neigh) { del_timer(&neigh->t0timer); neigh->t0timer.function = rose_t0timer_expiry; neigh->t0timer.expires = jiffies + msecs_to_jiffies(sysctl_rose_restart_request_timeout); add_timer(&neigh->t0timer); } void rose_stop_ftimer(struct rose_neigh *neigh) { del_timer(&neigh->ftimer); } void rose_stop_t0timer(struct rose_neigh *neigh) { del_timer(&neigh->t0timer); } int rose_ftimer_running(struct rose_neigh *neigh) { return timer_pending(&neigh->ftimer); } static int rose_t0timer_running(struct rose_neigh *neigh) { return timer_pending(&neigh->t0timer); } static void rose_ftimer_expiry(struct timer_list *t) { } static void rose_t0timer_expiry(struct timer_list *t) { struct rose_neigh *neigh = from_timer(neigh, t, t0timer); rose_transmit_restart_request(neigh); neigh->dce_mode = 0; rose_start_t0timer(neigh); } /* * Interface to ax25_send_frame. Changes my level 2 callsign depending * on whether we have a global ROSE callsign or use the default port * callsign. */ static int rose_send_frame(struct sk_buff *skb, struct rose_neigh *neigh) { ax25_address *rose_call; ax25_cb *ax25s; if (ax25cmp(&rose_callsign, &null_ax25_address) == 0) rose_call = (ax25_address *)neigh->dev->dev_addr; else rose_call = &rose_callsign; ax25s = neigh->ax25; neigh->ax25 = ax25_send_frame(skb, 260, rose_call, &neigh->callsign, neigh->digipeat, neigh->dev); if (ax25s) ax25_cb_put(ax25s); return neigh->ax25 != NULL; } /* * Interface to ax25_link_up. Changes my level 2 callsign depending * on whether we have a global ROSE callsign or use the default port * callsign. */ static int rose_link_up(struct rose_neigh *neigh) { ax25_address *rose_call; ax25_cb *ax25s; if (ax25cmp(&rose_callsign, &null_ax25_address) == 0) rose_call = (ax25_address *)neigh->dev->dev_addr; else rose_call = &rose_callsign; ax25s = neigh->ax25; neigh->ax25 = ax25_find_cb(rose_call, &neigh->callsign, neigh->digipeat, neigh->dev); if (ax25s) ax25_cb_put(ax25s); return neigh->ax25 != NULL; } /* * This handles all restart and diagnostic frames. */ void rose_link_rx_restart(struct sk_buff *skb, struct rose_neigh *neigh, unsigned short frametype) { struct sk_buff *skbn; switch (frametype) { case ROSE_RESTART_REQUEST: rose_stop_t0timer(neigh); neigh->restarted = 1; neigh->dce_mode = (skb->data[3] == ROSE_DTE_ORIGINATED); rose_transmit_restart_confirmation(neigh); break; case ROSE_RESTART_CONFIRMATION: rose_stop_t0timer(neigh); neigh->restarted = 1; break; case ROSE_DIAGNOSTIC: pr_warn("ROSE: received diagnostic #%d - %3ph\n", skb->data[3], skb->data + 4); break; default: printk(KERN_WARNING "ROSE: received unknown %02X with LCI 000\n", frametype); break; } if (neigh->restarted) { while ((skbn = skb_dequeue(&neigh->queue)) != NULL) if (!rose_send_frame(skbn, neigh)) kfree_skb(skbn); } } /* * This routine is called when a Restart Request is needed */ static void rose_transmit_restart_request(struct rose_neigh *neigh) { struct sk_buff *skb; unsigned char *dptr; int len; len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN + 3; if ((skb = alloc_skb(len, GFP_ATOMIC)) == NULL) return; skb_reserve(skb, AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN); dptr = skb_put(skb, ROSE_MIN_LEN + 3); *dptr++ = AX25_P_ROSE; *dptr++ = ROSE_GFI; *dptr++ = 0x00; *dptr++ = ROSE_RESTART_REQUEST; *dptr++ = ROSE_DTE_ORIGINATED; *dptr++ = 0; if (!rose_send_frame(skb, neigh)) kfree_skb(skb); } /* * This routine is called when a Restart Confirmation is needed */ static void rose_transmit_restart_confirmation(struct rose_neigh *neigh) { struct sk_buff *skb; unsigned char *dptr; int len; len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN + 1; if ((skb = alloc_skb(len, GFP_ATOMIC)) == NULL) return; skb_reserve(skb, AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN); dptr = skb_put(skb, ROSE_MIN_LEN + 1); *dptr++ = AX25_P_ROSE; *dptr++ = ROSE_GFI; *dptr++ = 0x00; *dptr++ = ROSE_RESTART_CONFIRMATION; if (!rose_send_frame(skb, neigh)) kfree_skb(skb); } /* * This routine is called when a Clear Request is needed outside of the context * of a connected socket. */ void rose_transmit_clear_request(struct rose_neigh *neigh, unsigned int lci, unsigned char cause, unsigned char diagnostic) { struct sk_buff *skb; unsigned char *dptr; int len; len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN + 3; if ((skb = alloc_skb(len, GFP_ATOMIC)) == NULL) return; skb_reserve(skb, AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN); dptr = skb_put(skb, ROSE_MIN_LEN + 3); *dptr++ = AX25_P_ROSE; *dptr++ = ((lci >> 8) & 0x0F) | ROSE_GFI; *dptr++ = ((lci >> 0) & 0xFF); *dptr++ = ROSE_CLEAR_REQUEST; *dptr++ = cause; *dptr++ = diagnostic; if (!rose_send_frame(skb, neigh)) kfree_skb(skb); } void rose_transmit_link(struct sk_buff *skb, struct rose_neigh *neigh) { unsigned char *dptr; if (neigh->loopback) { rose_loopback_queue(skb, neigh); return; } if (!rose_link_up(neigh)) neigh->restarted = 0; dptr = skb_push(skb, 1); *dptr++ = AX25_P_ROSE; if (neigh->restarted) { if (!rose_send_frame(skb, neigh)) kfree_skb(skb); } else { skb_queue_tail(&neigh->queue, skb); if (!rose_t0timer_running(neigh)) { rose_transmit_restart_request(neigh); neigh->dce_mode = 0; rose_start_t0timer(neigh); } } }