cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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raw.c (2181B)

      1// SPDX-License-Identifier: GPL-2.0
      2/* net/atm/raw.c - Raw AAL0 and AAL5 transports */
      3
      4/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
      5
      6#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
      7
      8#include <linux/module.h>
      9#include <linux/atmdev.h>
     10#include <linux/capability.h>
     11#include <linux/kernel.h>
     12#include <linux/skbuff.h>
     13#include <linux/mm.h>
     14#include <linux/slab.h>
     15
     16#include "common.h"
     17#include "protocols.h"
     18
     19/*
     20 * SKB == NULL indicates that the link is being closed
     21 */
     22
     23static void atm_push_raw(struct atm_vcc *vcc, struct sk_buff *skb)
     24{
     25	if (skb) {
     26		struct sock *sk = sk_atm(vcc);
     27
     28		skb_queue_tail(&sk->sk_receive_queue, skb);
     29		sk->sk_data_ready(sk);
     30	}
     31}
     32
     33static void atm_pop_raw(struct atm_vcc *vcc, struct sk_buff *skb)
     34{
     35	struct sock *sk = sk_atm(vcc);
     36
     37	pr_debug("(%d) %d -= %d\n",
     38		 vcc->vci, sk_wmem_alloc_get(sk), ATM_SKB(skb)->acct_truesize);
     39	WARN_ON(refcount_sub_and_test(ATM_SKB(skb)->acct_truesize, &sk->sk_wmem_alloc));
     40	dev_kfree_skb_any(skb);
     41	sk->sk_write_space(sk);
     42}
     43
     44static int atm_send_aal0(struct atm_vcc *vcc, struct sk_buff *skb)
     45{
     46	/*
     47	 * Note that if vpi/vci are _ANY or _UNSPEC the below will
     48	 * still work
     49	 */
     50	if (!capable(CAP_NET_ADMIN) &&
     51	    (((u32 *)skb->data)[0] & (ATM_HDR_VPI_MASK | ATM_HDR_VCI_MASK)) !=
     52	    ((vcc->vpi << ATM_HDR_VPI_SHIFT) |
     53	     (vcc->vci << ATM_HDR_VCI_SHIFT))) {
     54		kfree_skb(skb);
     55		return -EADDRNOTAVAIL;
     56	}
     57	if (vcc->dev->ops->send_bh)
     58		return vcc->dev->ops->send_bh(vcc, skb);
     59	return vcc->dev->ops->send(vcc, skb);
     60}
     61
     62int atm_init_aal0(struct atm_vcc *vcc)
     63{
     64	vcc->push = atm_push_raw;
     65	vcc->pop = atm_pop_raw;
     66	vcc->push_oam = NULL;
     67	vcc->send = atm_send_aal0;
     68	return 0;
     69}
     70
     71int atm_init_aal34(struct atm_vcc *vcc)
     72{
     73	vcc->push = atm_push_raw;
     74	vcc->pop = atm_pop_raw;
     75	vcc->push_oam = NULL;
     76	if (vcc->dev->ops->send_bh)
     77		vcc->send = vcc->dev->ops->send_bh;
     78	else
     79		vcc->send = vcc->dev->ops->send;
     80	return 0;
     81}
     82
     83int atm_init_aal5(struct atm_vcc *vcc)
     84{
     85	vcc->push = atm_push_raw;
     86	vcc->pop = atm_pop_raw;
     87	vcc->push_oam = NULL;
     88	if (vcc->dev->ops->send_bh)
     89		vcc->send = vcc->dev->ops->send_bh;
     90	else
     91		vcc->send = vcc->dev->ops->send;
     92	return 0;
     93}
     94EXPORT_SYMBOL(atm_init_aal5);