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 * SKB == NULL indicates that the link is being closed 18 */ 19 20 static void atm_push_raw(struct atm_vcc *vcc,struct sk_buff *skb) 21 { 22 if (skb) { 23 struct sock *sk = sk_atm(vcc); 24 25 skb_queue_tail(&sk->sk_receive_queue, skb); 26 sk->sk_data_ready(sk, skb->len); 27 } 28 } 29 30 31 static void atm_pop_raw(struct atm_vcc *vcc,struct sk_buff *skb) 32 { 33 struct sock *sk = sk_atm(vcc); 34 35 pr_debug("APopR (%d) %d -= %d\n", vcc->vci, 36 atomic_read(&sk->sk_wmem_alloc), skb->truesize); 37 atomic_sub(skb->truesize, &sk->sk_wmem_alloc); 38 dev_kfree_skb_any(skb); 39 sk->sk_write_space(sk); 40 } 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) | (vcc->vci << ATM_HDR_VCI_SHIFT))) 52 { 53 kfree_skb(skb); 54 return -EADDRNOTAVAIL; 55 } 56 return vcc->dev->ops->send(vcc,skb); 57 } 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 70 int atm_init_aal34(struct atm_vcc *vcc) 71 { 72 vcc->push = atm_push_raw; 73 vcc->pop = atm_pop_raw; 74 vcc->push_oam = NULL; 75 vcc->send = vcc->dev->ops->send; 76 return 0; 77 } 78 79 80 int atm_init_aal5(struct atm_vcc *vcc) 81 { 82 vcc->push = atm_push_raw; 83 vcc->pop = atm_pop_raw; 84 vcc->push_oam = NULL; 85 vcc->send = vcc->dev->ops->send; 86 return 0; 87 } 88 89 90 EXPORT_SYMBOL(atm_init_aal5); 91