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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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