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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/net/atm/raw.c
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/* net/atm/raw.c - Raw AAL0 and AAL5 transports */

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/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */

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#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__

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#include <linux/module.h>

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#include <linux/atmdev.h>

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#include <linux/capability.h>

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#include <linux/kernel.h>

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#include <linux/skbuff.h>

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#include <linux/mm.h>

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#include <linux/slab.h>

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#include "common.h"

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#include "protocols.h"

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/*

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 * SKB == NULL indicates that the link is being closed

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 */

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static void atm_push_raw(struct atm_vcc *vcc, struct sk_buff *skb)

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{

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	if (skb) {

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		struct sock *sk = sk_atm(vcc);

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		skb_queue_tail(&sk->sk_receive_queue, skb);

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		sk->sk_data_ready(sk, skb->len);

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	}

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}

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static void atm_pop_raw(struct atm_vcc *vcc, struct sk_buff *skb)

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{

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	struct sock *sk = sk_atm(vcc);

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	pr_debug("(%d) %d -= %d\n",

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		 vcc->vci, sk_wmem_alloc_get(sk), skb->truesize);

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	atomic_sub(skb->truesize, &sk->sk_wmem_alloc);

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	dev_kfree_skb_any(skb);

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	sk->sk_write_space(sk);

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}

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static int atm_send_aal0(struct atm_vcc *vcc, struct sk_buff *skb)

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{

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	/*

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	 * Note that if vpi/vci are _ANY or _UNSPEC the below will

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	 * still work

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	 */

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	if (!capable(CAP_NET_ADMIN) &&

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	    (((u32 *)skb->data)[0] & (ATM_HDR_VPI_MASK | ATM_HDR_VCI_MASK)) !=

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	    ((vcc->vpi << ATM_HDR_VPI_SHIFT) |

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	     (vcc->vci << ATM_HDR_VCI_SHIFT))) {

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		kfree_skb(skb);

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		return -EADDRNOTAVAIL;

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	}

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	return vcc->dev->ops->send(vcc, skb);

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}

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int atm_init_aal0(struct atm_vcc *vcc)

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{

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	vcc->push = atm_push_raw;

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	vcc->pop = atm_pop_raw;

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	vcc->push_oam = NULL;

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	vcc->send = atm_send_aal0;

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	return 0;

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}

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int atm_init_aal34(struct atm_vcc *vcc)

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{

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	vcc->push = atm_push_raw;

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	vcc->pop = atm_pop_raw;

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	vcc->push_oam = NULL;

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	vcc->send = vcc->dev->ops->send;

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	return 0;

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}

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int atm_init_aal5(struct atm_vcc *vcc)

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{

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	vcc->push = atm_push_raw;

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	vcc->pop = atm_pop_raw;

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	vcc->push_oam = NULL;

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	vcc->send = vcc->dev->ops->send;

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	return 0;

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}

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EXPORT_SYMBOL(atm_init_aal5);

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