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); 87