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

 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);