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
atm_push_raw(struct atm_vcc * vcc,struct sk_buff * skb)28 void atm_push_raw(struct atm_vcc *vcc,struct sk_buff *skb)
29 {
30 if (skb) {
31 skb_queue_tail(&vcc->sk->receive_queue,skb);
32 wake_up(&vcc->sleep);
33 }
34 }
35
36
atm_pop_raw(struct atm_vcc * vcc,struct sk_buff * skb)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->sk->wmem_alloc,skb->truesize);
40 atomic_sub(skb->truesize, &vcc->sk->wmem_alloc);
41 dev_kfree_skb_any(skb);
42 wake_up(&vcc->sleep);
43 }
44
45
atm_send_aal0(struct atm_vcc * vcc,struct sk_buff * skb)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
atm_init_aal0(struct atm_vcc * vcc)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
atm_init_aal34(struct atm_vcc * vcc)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
atm_init_aal5(struct atm_vcc * vcc)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