1/* net/atm/raw.c - Raw AAL0 and AAL5 transports */
2
3/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
4
5
6#include <linux/module.h>
7#include <linux/atmdev.h>
8#include <linux/capability.h>
9#include <linux/kernel.h>
10#include <linux/skbuff.h>
11#include <linux/mm.h>
12
13#include "common.h"
14#include "protocols.h"
15
16
17#define DPRINTK(format,args...)
18
19
20/*
21 * SKB == NULL indicates that the link is being closed
22 */
23
24static void atm_push_raw(struct atm_vcc *vcc,struct sk_buff *skb)
25{
26	if (skb) {
27		struct sock *sk = sk_atm(vcc);
28
29		skb_queue_tail(&sk->sk_receive_queue, skb);
30		sk->sk_data_ready(sk, skb->len);
31	}
32}
33
34
35static void atm_pop_raw(struct atm_vcc *vcc,struct sk_buff *skb)
36{
37	struct sock *sk = sk_atm(vcc);
38
39	DPRINTK("APopR (%d) %d -= %d\n", vcc->vci, sk->sk_wmem_alloc,
40		skb->truesize);
41	atomic_sub(skb->truesize, &sk->sk_wmem_alloc);
42	dev_kfree_skb_any(skb);
43	sk->sk_write_space(sk);
44}
45
46
47static int atm_send_aal0(struct atm_vcc *vcc,struct sk_buff *skb)
48{
49	/*
50	 * Note that if vpi/vci are _ANY or _UNSPEC the below will
51	 * still work
52	 */
53	if (!capable(CAP_NET_ADMIN) &&
54	    (((u32 *) skb->data)[0] & (ATM_HDR_VPI_MASK | ATM_HDR_VCI_MASK)) !=
55	    ((vcc->vpi << ATM_HDR_VPI_SHIFT) | (vcc->vci << ATM_HDR_VCI_SHIFT)))
56	    {
57		kfree_skb(skb);
58		return -EADDRNOTAVAIL;
59	}
60	return vcc->dev->ops->send(vcc,skb);
61}
62
63
64int atm_init_aal0(struct atm_vcc *vcc)
65{
66	vcc->push = atm_push_raw;
67	vcc->pop = atm_pop_raw;
68	vcc->push_oam = NULL;
69	vcc->send = atm_send_aal0;
70	return 0;
71}
72
73
74int atm_init_aal34(struct atm_vcc *vcc)
75{
76	vcc->push = atm_push_raw;
77	vcc->pop = atm_pop_raw;
78	vcc->push_oam = NULL;
79	vcc->send = vcc->dev->ops->send;
80	return 0;
81}
82
83
84int atm_init_aal5(struct atm_vcc *vcc)
85{
86	vcc->push = atm_push_raw;
87	vcc->pop = atm_pop_raw;
88	vcc->push_oam = NULL;
89	vcc->send = vcc->dev->ops->send;
90	return 0;
91}
92
93
94EXPORT_SYMBOL(atm_init_aal5);
95