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286 lines
6.4 KiB
286 lines
6.4 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* |
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* Copyright (C) Jonathan Naylor G4KLX ([email protected]) |
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*/ |
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#include <linux/errno.h> |
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#include <linux/types.h> |
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#include <linux/socket.h> |
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#include <linux/in.h> |
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#include <linux/kernel.h> |
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#include <linux/jiffies.h> |
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#include <linux/timer.h> |
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#include <linux/string.h> |
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#include <linux/sockios.h> |
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#include <linux/net.h> |
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#include <linux/slab.h> |
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#include <net/ax25.h> |
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#include <linux/inet.h> |
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#include <linux/netdevice.h> |
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#include <linux/skbuff.h> |
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#include <net/sock.h> |
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#include <linux/fcntl.h> |
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#include <linux/mm.h> |
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#include <linux/interrupt.h> |
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#include <net/rose.h> |
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static void rose_ftimer_expiry(struct timer_list *); |
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static void rose_t0timer_expiry(struct timer_list *); |
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static void rose_transmit_restart_confirmation(struct rose_neigh *neigh); |
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static void rose_transmit_restart_request(struct rose_neigh *neigh); |
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void rose_start_ftimer(struct rose_neigh *neigh) |
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{ |
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del_timer(&neigh->ftimer); |
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neigh->ftimer.function = rose_ftimer_expiry; |
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neigh->ftimer.expires = |
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jiffies + msecs_to_jiffies(sysctl_rose_link_fail_timeout); |
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add_timer(&neigh->ftimer); |
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} |
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static void rose_start_t0timer(struct rose_neigh *neigh) |
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{ |
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del_timer(&neigh->t0timer); |
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neigh->t0timer.function = rose_t0timer_expiry; |
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neigh->t0timer.expires = |
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jiffies + msecs_to_jiffies(sysctl_rose_restart_request_timeout); |
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add_timer(&neigh->t0timer); |
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} |
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void rose_stop_ftimer(struct rose_neigh *neigh) |
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{ |
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del_timer(&neigh->ftimer); |
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} |
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void rose_stop_t0timer(struct rose_neigh *neigh) |
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{ |
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del_timer(&neigh->t0timer); |
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} |
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int rose_ftimer_running(struct rose_neigh *neigh) |
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{ |
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return timer_pending(&neigh->ftimer); |
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} |
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static int rose_t0timer_running(struct rose_neigh *neigh) |
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{ |
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return timer_pending(&neigh->t0timer); |
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} |
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static void rose_ftimer_expiry(struct timer_list *t) |
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{ |
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} |
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static void rose_t0timer_expiry(struct timer_list *t) |
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{ |
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struct rose_neigh *neigh = from_timer(neigh, t, t0timer); |
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rose_transmit_restart_request(neigh); |
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neigh->dce_mode = 0; |
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rose_start_t0timer(neigh); |
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} |
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/* |
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* Interface to ax25_send_frame. Changes my level 2 callsign depending |
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* on whether we have a global ROSE callsign or use the default port |
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* callsign. |
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*/ |
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static int rose_send_frame(struct sk_buff *skb, struct rose_neigh *neigh) |
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{ |
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const ax25_address *rose_call; |
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ax25_cb *ax25s; |
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if (ax25cmp(&rose_callsign, &null_ax25_address) == 0) |
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rose_call = (const ax25_address *)neigh->dev->dev_addr; |
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else |
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rose_call = &rose_callsign; |
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ax25s = neigh->ax25; |
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neigh->ax25 = ax25_send_frame(skb, 260, rose_call, &neigh->callsign, neigh->digipeat, neigh->dev); |
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if (ax25s) |
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ax25_cb_put(ax25s); |
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return neigh->ax25 != NULL; |
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} |
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/* |
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* Interface to ax25_link_up. Changes my level 2 callsign depending |
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* on whether we have a global ROSE callsign or use the default port |
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* callsign. |
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*/ |
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static int rose_link_up(struct rose_neigh *neigh) |
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{ |
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const ax25_address *rose_call; |
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ax25_cb *ax25s; |
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if (ax25cmp(&rose_callsign, &null_ax25_address) == 0) |
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rose_call = (const ax25_address *)neigh->dev->dev_addr; |
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else |
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rose_call = &rose_callsign; |
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ax25s = neigh->ax25; |
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neigh->ax25 = ax25_find_cb(rose_call, &neigh->callsign, neigh->digipeat, neigh->dev); |
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if (ax25s) |
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ax25_cb_put(ax25s); |
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return neigh->ax25 != NULL; |
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} |
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/* |
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* This handles all restart and diagnostic frames. |
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*/ |
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void rose_link_rx_restart(struct sk_buff *skb, struct rose_neigh *neigh, unsigned short frametype) |
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{ |
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struct sk_buff *skbn; |
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switch (frametype) { |
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case ROSE_RESTART_REQUEST: |
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rose_stop_t0timer(neigh); |
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neigh->restarted = 1; |
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neigh->dce_mode = (skb->data[3] == ROSE_DTE_ORIGINATED); |
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rose_transmit_restart_confirmation(neigh); |
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break; |
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case ROSE_RESTART_CONFIRMATION: |
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rose_stop_t0timer(neigh); |
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neigh->restarted = 1; |
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break; |
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case ROSE_DIAGNOSTIC: |
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pr_warn("ROSE: received diagnostic #%d - %3ph\n", skb->data[3], |
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skb->data + 4); |
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break; |
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default: |
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printk(KERN_WARNING "ROSE: received unknown %02X with LCI 000\n", frametype); |
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break; |
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} |
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if (neigh->restarted) { |
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while ((skbn = skb_dequeue(&neigh->queue)) != NULL) |
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if (!rose_send_frame(skbn, neigh)) |
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kfree_skb(skbn); |
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} |
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} |
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/* |
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* This routine is called when a Restart Request is needed |
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*/ |
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static void rose_transmit_restart_request(struct rose_neigh *neigh) |
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{ |
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struct sk_buff *skb; |
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unsigned char *dptr; |
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int len; |
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len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN + 3; |
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if ((skb = alloc_skb(len, GFP_ATOMIC)) == NULL) |
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return; |
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skb_reserve(skb, AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN); |
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dptr = skb_put(skb, ROSE_MIN_LEN + 3); |
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*dptr++ = AX25_P_ROSE; |
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*dptr++ = ROSE_GFI; |
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*dptr++ = 0x00; |
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*dptr++ = ROSE_RESTART_REQUEST; |
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*dptr++ = ROSE_DTE_ORIGINATED; |
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*dptr++ = 0; |
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if (!rose_send_frame(skb, neigh)) |
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kfree_skb(skb); |
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} |
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/* |
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* This routine is called when a Restart Confirmation is needed |
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*/ |
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static void rose_transmit_restart_confirmation(struct rose_neigh *neigh) |
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{ |
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struct sk_buff *skb; |
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unsigned char *dptr; |
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int len; |
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len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN + 1; |
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if ((skb = alloc_skb(len, GFP_ATOMIC)) == NULL) |
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return; |
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skb_reserve(skb, AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN); |
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dptr = skb_put(skb, ROSE_MIN_LEN + 1); |
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*dptr++ = AX25_P_ROSE; |
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*dptr++ = ROSE_GFI; |
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*dptr++ = 0x00; |
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*dptr++ = ROSE_RESTART_CONFIRMATION; |
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if (!rose_send_frame(skb, neigh)) |
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kfree_skb(skb); |
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} |
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/* |
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* This routine is called when a Clear Request is needed outside of the context |
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* of a connected socket. |
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*/ |
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void rose_transmit_clear_request(struct rose_neigh *neigh, unsigned int lci, unsigned char cause, unsigned char diagnostic) |
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{ |
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struct sk_buff *skb; |
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unsigned char *dptr; |
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int len; |
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len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN + 3; |
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if ((skb = alloc_skb(len, GFP_ATOMIC)) == NULL) |
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return; |
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skb_reserve(skb, AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN); |
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dptr = skb_put(skb, ROSE_MIN_LEN + 3); |
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*dptr++ = AX25_P_ROSE; |
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*dptr++ = ((lci >> 8) & 0x0F) | ROSE_GFI; |
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*dptr++ = ((lci >> 0) & 0xFF); |
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*dptr++ = ROSE_CLEAR_REQUEST; |
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*dptr++ = cause; |
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*dptr++ = diagnostic; |
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if (!rose_send_frame(skb, neigh)) |
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kfree_skb(skb); |
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} |
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void rose_transmit_link(struct sk_buff *skb, struct rose_neigh *neigh) |
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{ |
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unsigned char *dptr; |
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if (neigh->loopback) { |
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rose_loopback_queue(skb, neigh); |
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return; |
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} |
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if (!rose_link_up(neigh)) |
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neigh->restarted = 0; |
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dptr = skb_push(skb, 1); |
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*dptr++ = AX25_P_ROSE; |
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if (neigh->restarted) { |
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if (!rose_send_frame(skb, neigh)) |
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kfree_skb(skb); |
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} else { |
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skb_queue_tail(&neigh->queue, skb); |
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if (!rose_t0timer_running(neigh)) { |
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rose_transmit_restart_request(neigh); |
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neigh->dce_mode = 0; |
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rose_start_t0timer(neigh); |
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} |
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} |
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}
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