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 #if 0 18 #define DPRINTK(format,args...) printk(KERN_DEBUG format,##args) 19 #else 20 #define DPRINTK(format,args...) 21 #endif 22 23 24 /* 25 * SKB == NULL indicates that the link is being closed 26 */ 27 28 static void atm_push_raw(struct atm_vcc *vcc,struct sk_buff *skb) 29 { 30 if (skb) { 31 struct sock *sk = sk_atm(vcc); 32 33 skb_queue_tail(&sk->sk_receive_queue, skb); 34 sk->sk_data_ready(sk, skb->len); 35 } 36 } 37 38 39 static void atm_pop_raw(struct atm_vcc *vcc,struct sk_buff *skb) 40 { 41 struct sock *sk = sk_atm(vcc); 42 43 DPRINTK("APopR (%d) %d -= %d\n", vcc->vci, sk->sk_wmem_alloc, 44 skb->truesize); 45 atomic_sub(skb->truesize, &sk->sk_wmem_alloc); 46 dev_kfree_skb_any(skb); 47 sk->sk_write_space(sk); 48 } 49 50 51 static int atm_send_aal0(struct atm_vcc *vcc,struct sk_buff *skb) 52 { 53 /* 54 * Note that if vpi/vci are _ANY or _UNSPEC the below will 55 * still work 56 */ 57 if (!capable(CAP_NET_ADMIN) && 58 (((u32 *) skb->data)[0] & (ATM_HDR_VPI_MASK | ATM_HDR_VCI_MASK)) != 59 ((vcc->vpi << ATM_HDR_VPI_SHIFT) | (vcc->vci << ATM_HDR_VCI_SHIFT))) 60 { 61 kfree_skb(skb); 62 return -EADDRNOTAVAIL; 63 } 64 return vcc->dev->ops->send(vcc,skb); 65 } 66 67 68 int atm_init_aal0(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 = atm_send_aal0; 74 return 0; 75 } 76 77 78 int atm_init_aal34(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 87 88 int atm_init_aal5(struct atm_vcc *vcc) 89 { 90 vcc->push = atm_push_raw; 91 vcc->pop = atm_pop_raw; 92 vcc->push_oam = NULL; 93 vcc->send = vcc->dev->ops->send; 94 return 0; 95 } 96 97 98 EXPORT_SYMBOL(atm_init_aal5); 99