Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
[linux-2.6.git] / 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 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
6
7 #include <linux/module.h>
8 #include <linux/atmdev.h>
9 #include <linux/capability.h>
10 #include <linux/kernel.h>
11 #include <linux/skbuff.h>
12 #include <linux/mm.h>
13 #include <linux/slab.h>
14
15 #include "common.h"
16 #include "protocols.h"
17
18 /*
19  * SKB == NULL indicates that the link is being closed
20  */
21
22 static void atm_push_raw(struct atm_vcc *vcc, struct sk_buff *skb)
23 {
24         if (skb) {
25                 struct sock *sk = sk_atm(vcc);
26
27                 skb_queue_tail(&sk->sk_receive_queue, skb);
28                 sk->sk_data_ready(sk, skb->len);
29         }
30 }
31
32 static void atm_pop_raw(struct atm_vcc *vcc, struct sk_buff *skb)
33 {
34         struct sock *sk = sk_atm(vcc);
35
36         pr_debug("(%d) %d -= %d\n",
37                  vcc->vci, sk_wmem_alloc_get(sk), skb->truesize);
38         atomic_sub(skb->truesize, &sk->sk_wmem_alloc);
39         dev_kfree_skb_any(skb);
40         sk->sk_write_space(sk);
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) |
52              (vcc->vci << ATM_HDR_VCI_SHIFT))) {
53                 kfree_skb(skb);
54                 return -EADDRNOTAVAIL;
55         }
56         return vcc->dev->ops->send(vcc, skb);
57 }
58
59 int atm_init_aal0(struct atm_vcc *vcc)
60 {
61         vcc->push = atm_push_raw;
62         vcc->pop = atm_pop_raw;
63         vcc->push_oam = NULL;
64         vcc->send = atm_send_aal0;
65         return 0;
66 }
67
68 int atm_init_aal34(struct atm_vcc *vcc)
69 {
70         vcc->push = atm_push_raw;
71         vcc->pop = atm_pop_raw;
72         vcc->push_oam = NULL;
73         vcc->send = vcc->dev->ops->send;
74         return 0;
75 }
76
77 int atm_init_aal5(struct atm_vcc *vcc)
78 {
79         vcc->push = atm_push_raw;
80         vcc->pop = atm_pop_raw;
81         vcc->push_oam = NULL;
82         vcc->send = vcc->dev->ops->send;
83         return 0;
84 }
85 EXPORT_SYMBOL(atm_init_aal5);