mirror of https://gitee.com/openkylin/linux.git
95 lines
2.1 KiB
C
95 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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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);
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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), ATM_SKB(skb)->acct_truesize);
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WARN_ON(refcount_sub_and_test(ATM_SKB(skb)->acct_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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if (vcc->dev->ops->send_bh)
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return vcc->dev->ops->send_bh(vcc, skb);
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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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if (vcc->dev->ops->send_bh)
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vcc->send = vcc->dev->ops->send_bh;
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else
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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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if (vcc->dev->ops->send_bh)
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vcc->send = vcc->dev->ops->send_bh;
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else
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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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