1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* net/atm/raw.c - Raw AAL0 and AAL5 transports */ |
3 | |
4 | /* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */ |
5 | |
6 | #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__ |
7 | |
8 | #include <linux/module.h> |
9 | #include <linux/atmdev.h> |
10 | #include <linux/capability.h> |
11 | #include <linux/kernel.h> |
12 | #include <linux/skbuff.h> |
13 | #include <linux/mm.h> |
14 | #include <linux/slab.h> |
15 | |
16 | #include "common.h" |
17 | #include "protocols.h" |
18 | |
19 | /* |
20 | * SKB == NULL indicates that the link is being closed |
21 | */ |
22 | |
23 | static void atm_push_raw(struct atm_vcc *vcc, struct sk_buff *skb) |
24 | { |
25 | if (skb) { |
26 | struct sock *sk = sk_atm(vcc); |
27 | |
28 | skb_queue_tail(list: &sk->sk_receive_queue, newsk: skb); |
29 | sk->sk_data_ready(sk); |
30 | } |
31 | } |
32 | |
33 | static void atm_pop_raw(struct atm_vcc *vcc, struct sk_buff *skb) |
34 | { |
35 | struct sock *sk = sk_atm(vcc); |
36 | |
37 | pr_debug("(%d) %d -= %d\n" , |
38 | vcc->vci, sk_wmem_alloc_get(sk), ATM_SKB(skb)->acct_truesize); |
39 | WARN_ON(refcount_sub_and_test(ATM_SKB(skb)->acct_truesize, &sk->sk_wmem_alloc)); |
40 | dev_kfree_skb_any(skb); |
41 | sk->sk_write_space(sk); |
42 | } |
43 | |
44 | static int atm_send_aal0(struct atm_vcc *vcc, struct sk_buff *skb) |
45 | { |
46 | /* |
47 | * Note that if vpi/vci are _ANY or _UNSPEC the below will |
48 | * still work |
49 | */ |
50 | if (!capable(CAP_NET_ADMIN) && |
51 | (((u32 *)skb->data)[0] & (ATM_HDR_VPI_MASK | ATM_HDR_VCI_MASK)) != |
52 | ((vcc->vpi << ATM_HDR_VPI_SHIFT) | |
53 | (vcc->vci << ATM_HDR_VCI_SHIFT))) { |
54 | kfree_skb(skb); |
55 | return -EADDRNOTAVAIL; |
56 | } |
57 | if (vcc->dev->ops->send_bh) |
58 | return vcc->dev->ops->send_bh(vcc, skb); |
59 | return vcc->dev->ops->send(vcc, skb); |
60 | } |
61 | |
62 | int atm_init_aal0(struct atm_vcc *vcc) |
63 | { |
64 | vcc->push = atm_push_raw; |
65 | vcc->pop = atm_pop_raw; |
66 | vcc->push_oam = NULL; |
67 | vcc->send = atm_send_aal0; |
68 | return 0; |
69 | } |
70 | |
71 | int atm_init_aal34(struct atm_vcc *vcc) |
72 | { |
73 | vcc->push = atm_push_raw; |
74 | vcc->pop = atm_pop_raw; |
75 | vcc->push_oam = NULL; |
76 | if (vcc->dev->ops->send_bh) |
77 | vcc->send = vcc->dev->ops->send_bh; |
78 | else |
79 | vcc->send = vcc->dev->ops->send; |
80 | return 0; |
81 | } |
82 | |
83 | int atm_init_aal5(struct atm_vcc *vcc) |
84 | { |
85 | vcc->push = atm_push_raw; |
86 | vcc->pop = atm_pop_raw; |
87 | vcc->push_oam = NULL; |
88 | if (vcc->dev->ops->send_bh) |
89 | vcc->send = vcc->dev->ops->send_bh; |
90 | else |
91 | vcc->send = vcc->dev->ops->send; |
92 | return 0; |
93 | } |
94 | EXPORT_SYMBOL(atm_init_aal5); |
95 | |