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/sched.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 14 #include "common.h" 15 #include "protocols.h" 16 17 18 #if 0 19 #define DPRINTK(format,args...) printk(KERN_DEBUG format,##args) 20 #else 21 #define DPRINTK(format,args...) 22 #endif 23 24 25 /* 26 * SKB == NULL indicates that the link is being closed 27 */ 28 29 static void atm_push_raw(struct atm_vcc *vcc,struct sk_buff *skb) 30 { 31 if (skb) { 32 struct sock *sk = sk_atm(vcc); 33 34 skb_queue_tail(&sk->sk_receive_queue, skb); 35 sk->sk_data_ready(sk, skb->len); 36 } 37 } 38 39 40 static void atm_pop_raw(struct atm_vcc *vcc,struct sk_buff *skb) 41 { 42 struct sock *sk = sk_atm(vcc); 43 44 DPRINTK("APopR (%d) %d -= %d\n", vcc->vci, sk->sk_wmem_alloc, 45 skb->truesize); 46 atomic_sub(skb->truesize, &sk->sk_wmem_alloc); 47 dev_kfree_skb_any(skb); 48 sk->sk_write_space(sk); 49 } 50 51 52 static int atm_send_aal0(struct atm_vcc *vcc,struct sk_buff *skb) 53 { 54 /* 55 * Note that if vpi/vci are _ANY or _UNSPEC the below will 56 * still work 57 */ 58 if (!capable(CAP_NET_ADMIN) && 59 (((u32 *) skb->data)[0] & (ATM_HDR_VPI_MASK | ATM_HDR_VCI_MASK)) != 60 ((vcc->vpi << ATM_HDR_VPI_SHIFT) | (vcc->vci << ATM_HDR_VCI_SHIFT))) 61 { 62 kfree_skb(skb); 63 return -EADDRNOTAVAIL; 64 } 65 return vcc->dev->ops->send(vcc,skb); 66 } 67 68 69 int atm_init_aal0(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 = atm_send_aal0; 75 return 0; 76 } 77 78 79 int atm_init_aal34(struct atm_vcc *vcc) 80 { 81 vcc->push = atm_push_raw; 82 vcc->pop = atm_pop_raw; 83 vcc->push_oam = NULL; 84 vcc->send = vcc->dev->ops->send; 85 return 0; 86 } 87 88 89 int atm_init_aal5(struct atm_vcc *vcc) 90 { 91 vcc->push = atm_push_raw; 92 vcc->pop = atm_pop_raw; 93 vcc->push_oam = NULL; 94 vcc->send = vcc->dev->ops->send; 95 return 0; 96 } 97 98 99 EXPORT_SYMBOL(atm_init_aal5); 100