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 * SKB == NULL indicates that the link is being closed
18 */
19
20 static void atm_push_raw(struct atm_vcc *vcc,struct sk_buff *skb)
21 {
22 if (skb) {
23 struct sock *sk = sk_atm(vcc);
24
25 skb_queue_tail(&sk->sk_receive_queue, skb);
26 sk->sk_data_ready(sk, skb->len);
27 }
28 }
29
30
31 static void atm_pop_raw(struct atm_vcc *vcc,struct sk_buff *skb)
32 {
33 struct sock *sk = sk_atm(vcc);
34
35 pr_debug("APopR (%d) %d -= %d\n", vcc->vci,
36 sk_wmem_alloc_get(sk), skb->truesize);
37 atomic_sub(skb->truesize, &sk->sk_wmem_alloc);
38 dev_kfree_skb_any(skb);
39 sk->sk_write_space(sk);
40 }
41
42
43 static 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) | (vcc->vci << ATM_HDR_VCI_SHIFT)))
52 {
53 kfree_skb(skb);
54 return -EADDRNOTAVAIL;
55 }
56 return vcc->dev->ops->send(vcc,skb);
57 }
58
59
60 int 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
69
70 int atm_init_aal34(struct atm_vcc *vcc)
71 {
72 vcc->push = atm_push_raw;
73 vcc->pop = atm_pop_raw;
74 vcc->push_oam = NULL;
75 vcc->send = vcc->dev->ops->send;
76 return 0;
77 }
78
79
80 int atm_init_aal5(struct atm_vcc *vcc)
81 {
82 vcc->push = atm_push_raw;
83 vcc->pop = atm_pop_raw;
84 vcc->push_oam = NULL;
85 vcc->send = vcc->dev->ops->send;
86 return 0;
87 }
88
89
90 EXPORT_SYMBOL(atm_init_aal5);
91
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