1 /* net/atm/raw.c - Raw AAL0 and AAL5 transports */ 2 3 /* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */ 4 5 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__ 6 7 #include <linux/module.h> 8 #include <linux/atmdev.h> 9 #include <linux/capability.h> 10 #include <linux/kernel.h> 11 #include <linux/skbuff.h> 12 #include <linux/mm.h> 13 #include <linux/slab.h> 14 15 #include "common.h" 16 #include "protocols.h" 17 18 /* 19 * SKB == NULL indicates that the link is being closed 20 */ 21 22 static void atm_push_raw(struct atm_vcc *vcc, struct sk_buff *skb) 23 { 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); 29 } 30 } 31 32 static void atm_pop_raw(struct atm_vcc *vcc, struct sk_buff *skb) 33 { 34 struct sock *sk = sk_atm(vcc); 35 36 pr_debug("(%d) %d -= %d\n", 37 vcc->vci, sk_wmem_alloc_get(sk), skb->truesize); 38 WARN_ON(refcount_sub_and_test(skb->truesize, &sk->sk_wmem_alloc)); 39 dev_kfree_skb_any(skb); 40 sk->sk_write_space(sk); 41 } 42 43 static int atm_send_aal0(struct atm_vcc *vcc, struct sk_buff *skb) 44 { 45 /* 46 * Note that if vpi/vci are _ANY or _UNSPEC the below will 47 * still work 48 */ 49 if (!capable(CAP_NET_ADMIN) && 50 (((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))) { 53 kfree_skb(skb); 54 return -EADDRNOTAVAIL; 55 } 56 return vcc->dev->ops->send(vcc, skb); 57 } 58 59 int 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 68 int 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 77 int 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 } 85 EXPORT_SYMBOL(atm_init_aal5); 86