/*
 * 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 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/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 <net/tcp_states.h>
#include <linux/uaccess.h>
#include <linux/fcntl.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <net/netrom.h>

/*
 *	This routine purges all of the queues of frames.
 */
void nr_clear_queues(struct sock *sk)
{
	struct nr_sock *nr = nr_sk(sk);

	skb_queue_purge(&sk->sk_write_queue);
	skb_queue_purge(&nr->ack_queue);
	skb_queue_purge(&nr->reseq_queue);
	skb_queue_purge(&nr->frag_queue);
}

/*
 * This routine purges the input queue of those frames that have been
 * acknowledged. This replaces the boxes labelled "V(a) <- N(r)" on the
 * SDL diagram.
 */
void nr_frames_acked(struct sock *sk, unsigned short nr)
{
	struct nr_sock *nrom = nr_sk(sk);
	struct sk_buff *skb;

	/*
	 * Remove all the ack-ed frames from the ack queue.
	 */
	if (nrom->va != nr) {
		while (skb_peek(&nrom->ack_queue) != NULL && nrom->va != nr) {
			skb = skb_dequeue(&nrom->ack_queue);
			kfree_skb(skb);
			nrom->va = (nrom->va + 1) % NR_MODULUS;
		}
	}
}

/*
 * Requeue all the un-ack-ed frames on the output queue to be picked
 * up by nr_kick called from the timer. This arrangement handles the
 * possibility of an empty output queue.
 */
void nr_requeue_frames(struct sock *sk)
{
	struct sk_buff *skb, *skb_prev = NULL;

	while ((skb = skb_dequeue(&nr_sk(sk)->ack_queue)) != NULL) {
		if (skb_prev == NULL)
			skb_queue_head(&sk->sk_write_queue, skb);
		else
			skb_append(skb_prev, skb, &sk->sk_write_queue);
		skb_prev = skb;
	}
}

/*
 *	Validate that the value of nr is between va and vs. Return true or
 *	false for testing.
 */
int nr_validate_nr(struct sock *sk, unsigned short nr)
{
	struct nr_sock *nrom = nr_sk(sk);
	unsigned short vc = nrom->va;

	while (vc != nrom->vs) {
		if (nr == vc) return 1;
		vc = (vc + 1) % NR_MODULUS;
	}

	return nr == nrom->vs;
}

/*
 *	Check that ns is within the receive window.
 */
int nr_in_rx_window(struct sock *sk, unsigned short ns)
{
	struct nr_sock *nr = nr_sk(sk);
	unsigned short vc = nr->vr;
	unsigned short vt = (nr->vl + nr->window) % NR_MODULUS;

	while (vc != vt) {
		if (ns == vc) return 1;
		vc = (vc + 1) % NR_MODULUS;
	}

	return 0;
}

/*
 *  This routine is called when the HDLC layer internally generates a
 *  control frame.
 */
void nr_write_internal(struct sock *sk, int frametype)
{
	struct nr_sock *nr = nr_sk(sk);
	struct sk_buff *skb;
	unsigned char  *dptr;
	int len, timeout;

	len = NR_NETWORK_LEN + NR_TRANSPORT_LEN;

	switch (frametype & 0x0F) {
	case NR_CONNREQ:
		len += 17;
		break;
	case NR_CONNACK:
		len += (nr->bpqext) ? 2 : 1;
		break;
	case NR_DISCREQ:
	case NR_DISCACK:
	case NR_INFOACK:
		break;
	default:
		printk(KERN_ERR "NET/ROM: nr_write_internal - invalid frame type %d\n", frametype);
		return;
	}

	if ((skb = alloc_skb(len, GFP_ATOMIC)) == NULL)
		return;

	/*
	 *	Space for AX.25 and NET/ROM network header
	 */
	skb_reserve(skb, NR_NETWORK_LEN);

	dptr = skb_put(skb, skb_tailroom(skb));

	switch (frametype & 0x0F) {
	case NR_CONNREQ:
		timeout  = nr->t1 / HZ;
		*dptr++  = nr->my_index;
		*dptr++  = nr->my_id;
		*dptr++  = 0;
		*dptr++  = 0;
		*dptr++  = frametype;
		*dptr++  = nr->window;
		memcpy(dptr, &nr->user_addr, AX25_ADDR_LEN);
		dptr[6] &= ~AX25_CBIT;
		dptr[6] &= ~AX25_EBIT;
		dptr[6] |= AX25_SSSID_SPARE;
		dptr    += AX25_ADDR_LEN;
		memcpy(dptr, &nr->source_addr, AX25_ADDR_LEN);
		dptr[6] &= ~AX25_CBIT;
		dptr[6] &= ~AX25_EBIT;
		dptr[6] |= AX25_SSSID_SPARE;
		dptr    += AX25_ADDR_LEN;
		*dptr++  = timeout % 256;
		*dptr++  = timeout / 256;
		break;

	case NR_CONNACK:
		*dptr++ = nr->your_index;
		*dptr++ = nr->your_id;
		*dptr++ = nr->my_index;
		*dptr++ = nr->my_id;
		*dptr++ = frametype;
		*dptr++ = nr->window;
		if (nr->bpqext) *dptr++ = sysctl_netrom_network_ttl_initialiser;
		break;

	case NR_DISCREQ:
	case NR_DISCACK:
		*dptr++ = nr->your_index;
		*dptr++ = nr->your_id;
		*dptr++ = 0;
		*dptr++ = 0;
		*dptr++ = frametype;
		break;

	case NR_INFOACK:
		*dptr++ = nr->your_index;
		*dptr++ = nr->your_id;
		*dptr++ = 0;
		*dptr++ = nr->vr;
		*dptr++ = frametype;
		break;
	}

	nr_transmit_buffer(sk, skb);
}

/*
 * This routine is called to send an error reply.
 */
void __nr_transmit_reply(struct sk_buff *skb, int mine, unsigned char cmdflags)
{
	struct sk_buff *skbn;
	unsigned char *dptr;
	int len;

	len = NR_NETWORK_LEN + NR_TRANSPORT_LEN + 1;

	if ((skbn = alloc_skb(len, GFP_ATOMIC)) == NULL)
		return;

	skb_reserve(skbn, 0);

	dptr = skb_put(skbn, NR_NETWORK_LEN + NR_TRANSPORT_LEN);

	skb_copy_from_linear_data_offset(skb, 7, dptr, AX25_ADDR_LEN);
	dptr[6] &= ~AX25_CBIT;
	dptr[6] &= ~AX25_EBIT;
	dptr[6] |= AX25_SSSID_SPARE;
	dptr += AX25_ADDR_LEN;

	skb_copy_from_linear_data(skb, dptr, AX25_ADDR_LEN);
	dptr[6] &= ~AX25_CBIT;
	dptr[6] |= AX25_EBIT;
	dptr[6] |= AX25_SSSID_SPARE;
	dptr += AX25_ADDR_LEN;

	*dptr++ = sysctl_netrom_network_ttl_initialiser;

	if (mine) {
		*dptr++ = 0;
		*dptr++ = 0;
		*dptr++ = skb->data[15];
		*dptr++ = skb->data[16];
	} else {
		*dptr++ = skb->data[15];
		*dptr++ = skb->data[16];
		*dptr++ = 0;
		*dptr++ = 0;
	}

	*dptr++ = cmdflags;
	*dptr++ = 0;

	if (!nr_route_frame(skbn, NULL))
		kfree_skb(skbn);
}

void nr_disconnect(struct sock *sk, int reason)
{
	nr_stop_t1timer(sk);
	nr_stop_t2timer(sk);
	nr_stop_t4timer(sk);
	nr_stop_idletimer(sk);

	nr_clear_queues(sk);

	nr_sk(sk)->state = NR_STATE_0;

	sk->sk_state     = TCP_CLOSE;
	sk->sk_err       = reason;
	sk->sk_shutdown |= SEND_SHUTDOWN;

	if (!sock_flag(sk, SOCK_DEAD)) {
		sk->sk_state_change(sk);
		sock_set_flag(sk, SOCK_DEAD);
	}
}
4cb1a1f9dbd&amp;id2=3365135d43f861003555c963b309672d053a2228'>diff</a>)</td></tr><tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/tools/perf/arch?h=nds-private-remove&amp;id=950eabbd6ddedc1b08350b9169a6a51b130ebaaf'>950eabbd6ddedc1b08350b9169a6a51b130ebaaf</a> (<a href='/cgit.cgi/linux/net-next.git/diff/tools/perf/arch?h=nds-private-remove&amp;id=1b1bc42c1692e9b62756323c675a44cb1a1f9dbd&amp;id2=950eabbd6ddedc1b08350b9169a6a51b130ebaaf'>diff</a>)</td></tr></table>
<div class='commit-subject'>Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net</div><div class='commit-msg'>Pull networking fixes from David Miller:

 1) GTP fixes from Andreas Schultz (missing genl module alias, clear IP
    DF on transmit).

 2) Netfilter needs to reflect the fwmark when sending resets, from Pau
    Espin Pedrol.

 3) nftable dump OOPS fix from Liping Zhang.

 4) Fix erroneous setting of VIRTIO_NET_HDR_F_DATA_VALID on transmit,
    from Rolf Neugebauer.

 5) Fix build error of ipt_CLUSTERIP when procfs is disabled, from Arnd
    Bergmann.

 6) Fix regression in handling of NETIF_F_SG in harmonize_features(),
    from Eric Dumazet.

 7) Fix RTNL deadlock wrt. lwtunnel module loading, from David Ahern.

 8) tcp_fastopen_create_child() needs to setup tp-&gt;max_window, from
    Alexey Kodanev.

 9) Missing kmemdup() failure check in ipv6 segment routing code, from
    Eric Dumazet.

10) Don't execute unix_bind() under the bindlock, otherwise we deadlock
    with splice. From WANG Cong.

11) ip6_tnl_parse_tlv_enc_lim() potentially reallocates the skb buffer,
    therefore callers must reload cached header pointers into that skb.
    Fix from Eric Dumazet.

12) Fix various bugs in legacy IRQ fallback handling in alx driver, from
    Tobias Regnery.

13) Do not allow lwtunnel drivers to be unloaded while they are
    referenced by active instances, from Robert Shearman.

14) Fix truncated PHY LED trigger names, from Geert Uytterhoeven.

15) Fix a few regressions from virtio_net XDP support, from John
    Fastabend and Jakub Kicinski.

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (102 commits)
  ISDN: eicon: silence misleading array-bounds warning
  net: phy: micrel: add support for KSZ8795
  gtp: fix cross netns recv on gtp socket
  gtp: clear DF bit on GTP packet tx
  gtp: add genl family modules alias
  tcp: don't annotate mark on control socket from tcp_v6_send_response()
  ravb: unmap descriptors when freeing rings
  virtio_net: reject XDP programs using header adjustment
  virtio_net: use dev_kfree_skb for small buffer XDP receive
  r8152: check rx after napi is enabled
  r8152: re-schedule napi for tx
  r8152: avoid start_xmit to schedule napi when napi is disabled
  r8152: avoid start_xmit to call napi_schedule during autosuspend
  net: dsa: Bring back device detaching in dsa_slave_suspend()
  net: phy: leds: Fix truncated LED trigger names
  net: phy: leds: Break dependency of phy.h on phy_led_triggers.h
  net: phy: leds: Clear phy_num_led_triggers on failure to avoid crash
  net-next: ethernet: mediatek: change the compatible string
  Documentation: devicetree: change the mediatek ethernet compatible string
  bnxt_en: Fix RTNL lock usage on bnxt_get_port_module_status().
  ...
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?h=nds-private-remove&amp;id=1b1bc42c1692e9b62756323c675a44cb1a1f9dbd'>Diffstat</a> (limited to 'tools/perf/arch')</div><table summary='diffstat' class='diffstat'>