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raw.c
Package: linux-2.4.20.tar.gz　[view]
Upload User: jlfgdled
Upload Date: 2013-04-10
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Code Size: 2k
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Linux-Unix program

Development Platform:

Unix_Linux

raw.c：Code Content
  1. /* net/atm/raw.c - Raw AAL0 and AAL5 transports */
  3. /* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
  6. #include <linux/module.h>
  7. #include <linux/sched.h>
  8. #include <linux/atmdev.h>
  9. #include <linux/kernel.h>
  10. #include <linux/skbuff.h>
  11. #include <linux/mm.h>
  13. #include "common.h"
  14. #include "protocols.h"
  17. #if 0
  18. #define DPRINTK(format,args...) printk(KERN_DEBUG format,##args)
  19. #else
  20. #define DPRINTK(format,args...)
  21. #endif
  24. /*
  25.  * SKB == NULL indicates that the link is being closed
  26.  */
  28. void atm_push_raw(struct atm_vcc *vcc,struct sk_buff *skb)
  29. {
  30. if (skb) {
  31. skb_queue_tail(&vcc->recvq,skb);
  32. wake_up(&vcc->sleep);
  33. }
  34. }
  37. static void atm_pop_raw(struct atm_vcc *vcc,struct sk_buff *skb)
  38. {
  39. DPRINTK("APopR (%d) %d -= %dn",vcc->vci,vcc->tx_inuse,skb->truesize);
  40. atomic_sub(skb->truesize+ATM_PDU_OVHD,&vcc->tx_inuse);
  41. dev_kfree_skb_any(skb);
  42. wake_up(&vcc->sleep);
  43. }
  46. static int atm_send_aal0(struct atm_vcc *vcc,struct sk_buff *skb)
  47. {
  48. /*
  49.  * Note that if vpi/vci are _ANY or _UNSPEC the below will
  50.  * still work
  51.  */
  52. if (!capable(CAP_NET_ADMIN) &&
  53.             (((u32 *) skb->data)[0] & (ATM_HDR_VPI_MASK | ATM_HDR_VCI_MASK)) !=
  54.             ((vcc->vpi << ATM_HDR_VPI_SHIFT) | (vcc->vci << ATM_HDR_VCI_SHIFT)))
  55.     {
  56. kfree_skb(skb);
  57. return -EADDRNOTAVAIL;
  58.         }
  59. return vcc->dev->ops->send(vcc,skb);
  60. }
  63. int atm_init_aal0(struct atm_vcc *vcc)
  64. {
  65. vcc->push = atm_push_raw;
  66. vcc->pop = atm_pop_raw;
  67. vcc->push_oam = NULL;
  68. vcc->send = atm_send_aal0;
  69. return 0;
  70. }
  73. int atm_init_aal34(struct atm_vcc *vcc)
  74. {
  75. vcc->push = atm_push_raw;
  76. vcc->pop = atm_pop_raw;
  77. vcc->push_oam = NULL;
  78. vcc->send = vcc->dev->ops->send;
  79. return 0;
  80. }
  83. int atm_init_aal5(struct atm_vcc *vcc)
  84. {
  85. vcc->push = atm_push_raw;
  86. vcc->pop = atm_pop_raw;
  87. vcc->push_oam = NULL;
  88. vcc->send = vcc->dev->ops->send;
  89. return 0;
  90. }
  93. EXPORT_SYMBOL(atm_init_aal5);