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 return vcc->dev->ops->send(vcc, skb); 58} 59 60int atm_init_aal0(struct atm_vcc *vcc) 61{ 62 vcc->push = atm_push_raw; 63 vcc->pop = atm_pop_raw; 64 vcc->push_oam = NULL; 65 vcc->send = atm_send_aal0; 66 return 0; 67} 68 69int atm_init_aal34(struct atm_vcc *vcc) 70{ 71 vcc->push = atm_push_raw; 72 vcc->pop = atm_pop_raw; 73 vcc->push_oam = NULL; 74 vcc->send = vcc->dev->ops->send; 75 return 0; 76} 77 78int atm_init_aal5(struct atm_vcc *vcc) 79{ 80 vcc->push = atm_push_raw; 81 vcc->pop = atm_pop_raw; 82 vcc->push_oam = NULL; 83 vcc->send = vcc->dev->ops->send; 84 return 0; 85} 86EXPORT_SYMBOL(atm_init_aal5); 87