forked from luck/tmp_suning_uos_patched
c752f0739f
Lots of places just needs the states, not even linux/tcp.h, where this enum was, needs it. This speeds up development of the refactorings as less sources are rebuilt when things get moved from net/tcp.h. Signed-off-by: Arnaldo Carvalho de Melo <acme@ghostprotocols.net> Signed-off-by: David S. Miller <davem@davemloft.net>
284 lines
6.1 KiB
C
284 lines
6.1 KiB
C
/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* Copyright Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
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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/sched.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 <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 <net/tcp_states.h>
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#include <asm/uaccess.h>
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#include <asm/system.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/netrom.h>
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/*
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* This routine purges all of the queues of frames.
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*/
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void nr_clear_queues(struct sock *sk)
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{
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struct nr_sock *nr = nr_sk(sk);
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skb_queue_purge(&sk->sk_write_queue);
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skb_queue_purge(&nr->ack_queue);
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skb_queue_purge(&nr->reseq_queue);
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skb_queue_purge(&nr->frag_queue);
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}
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/*
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* This routine purges the input queue of those frames that have been
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* acknowledged. This replaces the boxes labelled "V(a) <- N(r)" on the
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* SDL diagram.
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*/
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void nr_frames_acked(struct sock *sk, unsigned short nr)
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{
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struct nr_sock *nrom = nr_sk(sk);
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struct sk_buff *skb;
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/*
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* Remove all the ack-ed frames from the ack queue.
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*/
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if (nrom->va != nr) {
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while (skb_peek(&nrom->ack_queue) != NULL && nrom->va != nr) {
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skb = skb_dequeue(&nrom->ack_queue);
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kfree_skb(skb);
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nrom->va = (nrom->va + 1) % NR_MODULUS;
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}
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}
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}
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/*
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* Requeue all the un-ack-ed frames on the output queue to be picked
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* up by nr_kick called from the timer. This arrangement handles the
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* possibility of an empty output queue.
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*/
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void nr_requeue_frames(struct sock *sk)
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{
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struct sk_buff *skb, *skb_prev = NULL;
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while ((skb = skb_dequeue(&nr_sk(sk)->ack_queue)) != NULL) {
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if (skb_prev == NULL)
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skb_queue_head(&sk->sk_write_queue, skb);
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else
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skb_append(skb_prev, skb, &sk->sk_write_queue);
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skb_prev = skb;
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}
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}
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/*
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* Validate that the value of nr is between va and vs. Return true or
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* false for testing.
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*/
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int nr_validate_nr(struct sock *sk, unsigned short nr)
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{
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struct nr_sock *nrom = nr_sk(sk);
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unsigned short vc = nrom->va;
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while (vc != nrom->vs) {
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if (nr == vc) return 1;
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vc = (vc + 1) % NR_MODULUS;
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}
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return nr == nrom->vs;
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}
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/*
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* Check that ns is within the receive window.
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*/
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int nr_in_rx_window(struct sock *sk, unsigned short ns)
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{
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struct nr_sock *nr = nr_sk(sk);
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unsigned short vc = nr->vr;
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unsigned short vt = (nr->vl + nr->window) % NR_MODULUS;
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while (vc != vt) {
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if (ns == vc) return 1;
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vc = (vc + 1) % NR_MODULUS;
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}
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return 0;
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}
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/*
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* This routine is called when the HDLC layer internally generates a
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* control frame.
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*/
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void nr_write_internal(struct sock *sk, int frametype)
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{
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struct nr_sock *nr = nr_sk(sk);
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struct sk_buff *skb;
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unsigned char *dptr;
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int len, timeout;
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len = NR_NETWORK_LEN + NR_TRANSPORT_LEN;
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switch (frametype & 0x0F) {
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case NR_CONNREQ:
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len += 17;
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break;
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case NR_CONNACK:
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len += (nr->bpqext) ? 2 : 1;
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break;
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case NR_DISCREQ:
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case NR_DISCACK:
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case NR_INFOACK:
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break;
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default:
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printk(KERN_ERR "NET/ROM: nr_write_internal - invalid frame type %d\n", frametype);
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return;
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}
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if ((skb = alloc_skb(len, GFP_ATOMIC)) == NULL)
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return;
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/*
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* Space for AX.25 and NET/ROM network header
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*/
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skb_reserve(skb, NR_NETWORK_LEN);
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dptr = skb_put(skb, skb_tailroom(skb));
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switch (frametype & 0x0F) {
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case NR_CONNREQ:
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timeout = nr->t1 / HZ;
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*dptr++ = nr->my_index;
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*dptr++ = nr->my_id;
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*dptr++ = 0;
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*dptr++ = 0;
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*dptr++ = frametype;
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*dptr++ = nr->window;
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memcpy(dptr, &nr->user_addr, AX25_ADDR_LEN);
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dptr[6] &= ~AX25_CBIT;
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dptr[6] &= ~AX25_EBIT;
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dptr[6] |= AX25_SSSID_SPARE;
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dptr += AX25_ADDR_LEN;
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memcpy(dptr, &nr->source_addr, AX25_ADDR_LEN);
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dptr[6] &= ~AX25_CBIT;
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dptr[6] &= ~AX25_EBIT;
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dptr[6] |= AX25_SSSID_SPARE;
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dptr += AX25_ADDR_LEN;
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*dptr++ = timeout % 256;
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*dptr++ = timeout / 256;
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break;
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case NR_CONNACK:
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*dptr++ = nr->your_index;
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*dptr++ = nr->your_id;
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*dptr++ = nr->my_index;
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*dptr++ = nr->my_id;
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*dptr++ = frametype;
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*dptr++ = nr->window;
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if (nr->bpqext) *dptr++ = sysctl_netrom_network_ttl_initialiser;
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break;
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case NR_DISCREQ:
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case NR_DISCACK:
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*dptr++ = nr->your_index;
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*dptr++ = nr->your_id;
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*dptr++ = 0;
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*dptr++ = 0;
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*dptr++ = frametype;
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break;
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case NR_INFOACK:
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*dptr++ = nr->your_index;
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*dptr++ = nr->your_id;
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*dptr++ = 0;
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*dptr++ = nr->vr;
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*dptr++ = frametype;
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break;
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}
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nr_transmit_buffer(sk, skb);
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}
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/*
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* This routine is called when a Connect Acknowledge with the Choke Flag
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* set is needed to refuse a connection.
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*/
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void nr_transmit_refusal(struct sk_buff *skb, int mine)
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{
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struct sk_buff *skbn;
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unsigned char *dptr;
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int len;
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len = NR_NETWORK_LEN + NR_TRANSPORT_LEN + 1;
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if ((skbn = alloc_skb(len, GFP_ATOMIC)) == NULL)
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return;
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skb_reserve(skbn, 0);
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dptr = skb_put(skbn, NR_NETWORK_LEN + NR_TRANSPORT_LEN);
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memcpy(dptr, skb->data + 7, AX25_ADDR_LEN);
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dptr[6] &= ~AX25_CBIT;
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dptr[6] &= ~AX25_EBIT;
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dptr[6] |= AX25_SSSID_SPARE;
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dptr += AX25_ADDR_LEN;
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memcpy(dptr, skb->data + 0, AX25_ADDR_LEN);
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dptr[6] &= ~AX25_CBIT;
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dptr[6] |= AX25_EBIT;
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dptr[6] |= AX25_SSSID_SPARE;
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dptr += AX25_ADDR_LEN;
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*dptr++ = sysctl_netrom_network_ttl_initialiser;
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if (mine) {
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*dptr++ = 0;
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*dptr++ = 0;
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*dptr++ = skb->data[15];
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*dptr++ = skb->data[16];
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} else {
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*dptr++ = skb->data[15];
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*dptr++ = skb->data[16];
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*dptr++ = 0;
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*dptr++ = 0;
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}
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*dptr++ = NR_CONNACK | NR_CHOKE_FLAG;
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*dptr++ = 0;
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if (!nr_route_frame(skbn, NULL))
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kfree_skb(skbn);
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}
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void nr_disconnect(struct sock *sk, int reason)
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{
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nr_stop_t1timer(sk);
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nr_stop_t2timer(sk);
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nr_stop_t4timer(sk);
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nr_stop_idletimer(sk);
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nr_clear_queues(sk);
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nr_sk(sk)->state = NR_STATE_0;
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sk->sk_state = TCP_CLOSE;
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sk->sk_err = reason;
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sk->sk_shutdown |= SEND_SHUTDOWN;
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if (!sock_flag(sk, SOCK_DEAD)) {
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sk->sk_state_change(sk);
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sock_set_flag(sk, SOCK_DEAD);
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}
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}
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