skbcreate.c

来自「ipsec vpn」· C语言 代码 · 共 40 行

#include "kernelenv.h"
#include "skb_fake.h"

struct sk_buff *skbFromArray(const unsigned char *buf, const unsigned int len)
{
  struct sk_buff *skb;

  skb = talloc(NULL, struct sk_buff);
  memset(skb, 0, sizeof(*skb));

  skb->head=talloc_size(NULL, len+128);
  memset(skb->head, 0x99, len+128);            /* just so that we can tell */

  skb->data=skb->head+64;                      /* leave some head room */
  memcpy(skb->data, buf, len);
  skb->tail=skb->data + len;
  skb->end=skb->head+len+128;

  skb->len = len;
  skb->data_len = 0;
  skb->protocol = ETH_P_IP;
  skb->mac_len = 14;
  skb->mac.raw = skb->data;

  return skb;
}

void skb_ethernet_ip_setup(struct sk_buff *skb)
{
  int iphlen;

  skb->nh.raw = skb_pull(skb, skb->mac_len);

  iphlen = (skb->nh.iph->ihl<<2);
  skb->h.raw = skb_pull(skb, iphlen);
}