File: /usr/src/linux/net/atm/raw.c

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/sched.h>
8     #include <linux/atmdev.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     #if 0
18     #define DPRINTK(format,args...) printk(KERN_DEBUG format,##args)
19     #else
20     #define DPRINTK(format,args...)
21     #endif
22     
23     
24     /*
25      * SKB == NULL indicates that the link is being closed
26      */
27     
28     void atm_push_raw(struct atm_vcc *vcc,struct sk_buff *skb)
29     {
30     	if (skb) {
31     		skb_queue_tail(&vcc->recvq,skb);
32     		wake_up(&vcc->sleep);
33     	}
34     }
35     
36     
37     static void atm_pop_raw(struct atm_vcc *vcc,struct sk_buff *skb)
38     {
39     	DPRINTK("APopR (%d) %d -= %d\n",vcc->vci,vcc->tx_inuse,skb->truesize);
40     	atomic_sub(skb->truesize+ATM_PDU_OVHD,&vcc->tx_inuse);
41     	dev_kfree_skb_any(skb);
42     	wake_up(&vcc->sleep);
43     }
44     
45     
46     static int atm_send_aal0(struct atm_vcc *vcc,struct sk_buff *skb)
47     {
48     	/*
49     	 * Note that if vpi/vci are _ANY or _UNSPEC the below will
50     	 * still work
51     	 */
52     	if (!capable(CAP_NET_ADMIN) &&
53                 (((u32 *) skb->data)[0] & (ATM_HDR_VPI_MASK | ATM_HDR_VCI_MASK)) !=
54                 ((vcc->vpi << ATM_HDR_VPI_SHIFT) | (vcc->vci << ATM_HDR_VCI_SHIFT)))
55     	    {
56     		kfree_skb(skb);
57     		return -EADDRNOTAVAIL;
58             }
59     	return vcc->dev->ops->send(vcc,skb);
60     }
61     
62     
63     int atm_init_aal0(struct atm_vcc *vcc)
64     {
65     	vcc->push = atm_push_raw;
66     	vcc->pop = atm_pop_raw;
67     	vcc->push_oam = NULL;
68     	vcc->send = atm_send_aal0;
69     	return 0;
70     }
71     
72     
73     int atm_init_aal34(struct atm_vcc *vcc)
74     {
75     	vcc->push = atm_push_raw;
76     	vcc->pop = atm_pop_raw;
77     	vcc->push_oam = NULL;
78     	vcc->send = vcc->dev->ops->send;
79     	return 0;
80     }
81     
82     
83     int 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     	vcc->send = vcc->dev->ops->send;
89     	return 0;
90     }
91     
92     
93     EXPORT_SYMBOL(atm_init_aal5);
94