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#define FRAG_CB(skb) ((struct ipfrag_skb_cb*)((skb)->cb))
struct ipfrag_skb_cb
{
struct inet_skb_parm h;
int offset;
};
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/* Describe an entry in the "incomplete datagrams" queue. */
struct ipq {
// ÏÂÒ»¸ö
struct ipq *next; /* linked list pointers */
// ×îÐÂʹÓÃÁ´±í
struct list_head lru_list; /* lru list member */
// ÒÔÏÂ4ÏîÓÃÀ´Æ¥ÅäÒ»×éIP·ÖÅä
u32 saddr;
u32 daddr;
u16 id;
u8 protocol;
// ״̬±êÖ¾
u8 last_in;
#define COMPLETE 4 // Êý¾ÝÒѾÍêÕû
#define FIRST_IN 2 // µÚÒ»¸ö°üµ½´ï
#define LAST_IN 1 // ×îºóÒ»¸ö°üµ½´ï
// ½ÓÊÕµ½µÄIPËéƬÁ´±í
struct sk_buff *fragments; /* linked list of received fragments */
// lenÊǸù¾Ý×îÐÂIPËéƬÖеÄÆ«ÒÆÐÅÏ¢µÃ³öµÄÊý¾Ý×ܳ¤
int len; /* total length of original datagram */
// meatÊÇËùÓÐËéƬʵ¼Ê³¤¶ÈµÄÀÛ¼Ó
int meat;
spinlock_t lock;
atomic_t refcnt;
// ³¬Ê±
struct timer_list timer; /* when will this queue expire? */
// Ç°Ò»Ïî¶ÓÁеØÖ·
struct ipq **pprev;
// Êý¾Ý½øÈëÍø¿¨µÄË÷ÒýºÅ
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