| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame^] | 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(&sk->sk_receive_queue, 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 | return vcc->dev->ops->send(vcc, skb); |
| 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 | int atm_init_aal34(struct atm_vcc *vcc) |
| 70 | { |
| 71 | vcc->push = atm_push_raw; |
| 72 | vcc->pop = atm_pop_raw; |
| 73 | vcc->push_oam = NULL; |
| 74 | vcc->send = vcc->dev->ops->send; |
| 75 | return 0; |
| 76 | } |
| 77 | |
| 78 | int atm_init_aal5(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 | EXPORT_SYMBOL(atm_init_aal5); |