xref: /openbmc/linux/net/atm/raw.c (revision e868d61272caa648214046a096e5a6bfc068dc8c)
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 #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 
28 static void atm_push_raw(struct atm_vcc *vcc,struct sk_buff *skb)
29 {
30 	if (skb) {
31 		struct sock *sk = sk_atm(vcc);
32 
33 		skb_queue_tail(&sk->sk_receive_queue, skb);
34 		sk->sk_data_ready(sk, skb->len);
35 	}
36 }
37 
38 
39 static void atm_pop_raw(struct atm_vcc *vcc,struct sk_buff *skb)
40 {
41 	struct sock *sk = sk_atm(vcc);
42 
43 	DPRINTK("APopR (%d) %d -= %d\n", vcc->vci, sk->sk_wmem_alloc,
44 		skb->truesize);
45 	atomic_sub(skb->truesize, &sk->sk_wmem_alloc);
46 	dev_kfree_skb_any(skb);
47 	sk->sk_write_space(sk);
48 }
49 
50 
51 static int atm_send_aal0(struct atm_vcc *vcc,struct sk_buff *skb)
52 {
53 	/*
54 	 * Note that if vpi/vci are _ANY or _UNSPEC the below will
55 	 * still work
56 	 */
57 	if (!capable(CAP_NET_ADMIN) &&
58 	    (((u32 *) skb->data)[0] & (ATM_HDR_VPI_MASK | ATM_HDR_VCI_MASK)) !=
59 	    ((vcc->vpi << ATM_HDR_VPI_SHIFT) | (vcc->vci << ATM_HDR_VCI_SHIFT)))
60 	    {
61 		kfree_skb(skb);
62 		return -EADDRNOTAVAIL;
63 	}
64 	return vcc->dev->ops->send(vcc,skb);
65 }
66 
67 
68 int atm_init_aal0(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 = atm_send_aal0;
74 	return 0;
75 }
76 
77 
78 int atm_init_aal34(struct atm_vcc *vcc)
79 {
80 	vcc->push = atm_push_raw;
81 	vcc->pop = atm_pop_raw;
82 	vcc->push_oam = NULL;
83 	vcc->send = vcc->dev->ops->send;
84 	return 0;
85 }
86 
87 
88 int atm_init_aal5(struct atm_vcc *vcc)
89 {
90 	vcc->push = atm_push_raw;
91 	vcc->pop = atm_pop_raw;
92 	vcc->push_oam = NULL;
93 	vcc->send = vcc->dev->ops->send;
94 	return 0;
95 }
96 
97 
98 EXPORT_SYMBOL(atm_init_aal5);
99