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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* net/atm/raw.c - Raw AAL0 and AAL5 transports */
2
3/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
4
Joe Perches99824462010-01-26 11:40:00 +00005#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
Linus Torvalds1da177e2005-04-16 15:20:36 -07006
7#include <linux/module.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07008#include <linux/atmdev.h>
Randy Dunlap4fc268d2006-01-11 12:17:47 -08009#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070010#include <linux/kernel.h>
11#include <linux/skbuff.h>
12#include <linux/mm.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090013#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070014
15#include "common.h"
16#include "protocols.h"
17
Linus Torvalds1da177e2005-04-16 15:20:36 -070018/*
19 * SKB == NULL indicates that the link is being closed
20 */
21
Joe Perchesfa61f0c2010-01-26 11:40:15 +000022static void atm_push_raw(struct atm_vcc *vcc, struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -070023{
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
Joe Perchesfa61f0c2010-01-26 11:40:15 +000032static void atm_pop_raw(struct atm_vcc *vcc, struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -070033{
34 struct sock *sk = sk_atm(vcc);
35
Joe Perches99824462010-01-26 11:40:00 +000036 pr_debug("(%d) %d -= %d\n",
37 vcc->vci, sk_wmem_alloc_get(sk), skb->truesize);
Linus Torvalds1da177e2005-04-16 15:20:36 -070038 atomic_sub(skb->truesize, &sk->sk_wmem_alloc);
39 dev_kfree_skb_any(skb);
40 sk->sk_write_space(sk);
41}
42
Joe Perchesfa61f0c2010-01-26 11:40:15 +000043static int atm_send_aal0(struct atm_vcc *vcc, struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -070044{
45 /*
46 * Note that if vpi/vci are _ANY or _UNSPEC the below will
47 * still work
48 */
49 if (!capable(CAP_NET_ADMIN) &&
Joe Perchesfa61f0c2010-01-26 11:40:15 +000050 (((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))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070053 kfree_skb(skb);
54 return -EADDRNOTAVAIL;
YOSHIFUJI Hideakif7d57452007-02-09 23:24:29 +090055 }
Joe Perchesfa61f0c2010-01-26 11:40:15 +000056 return vcc->dev->ops->send(vcc, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070057}
58
Linus Torvalds1da177e2005-04-16 15:20:36 -070059int 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070068int 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070077int 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}
Linus Torvalds1da177e2005-04-16 15:20:36 -070085EXPORT_SYMBOL(atm_init_aal5);