Speed limit module functions

Note:

1: The isactive value of the userinfo table is not updated in real time, but when the userinfo table is full, the isactive value of the table is updated only when 1 = isactive is not found in the new SKB and the MAC address is the same.

 

1: int usermgmt_init (void)

Call: called during system initialization.

Purpose:

(1) allocate 8 bwlimitrule spaces. The initial address is bwlimitrule;

Bwlimitrule [user_mgmt_max_bw_limit_rule];

(2) Allocate space for 100 userinfo entries. The initial address is userinfo;

Userinfo [user_mgmt_max_user_num];

(3) value assignment of the hook address of the account function of the speed limit module:

Usermgmt_isallowforward_hook = usermgmt_isallowforward;

(4) setmark_hook address assignment:

Usermgmt_setmark_hook = usermgmt_setmark;

 

2: int usermgmt_enable (INT isbandwidthlimitenable );

Call: board_ioctl is called when the speed limit function is enabled and disabled;

Purpose:

(1) When the speed limit function is Enabled: usermgmt_isallowforward_hook = usermgmt_isallowforward;

(2) When the speed limit function is disabled: usermgmt_isallowforward_hook = NULL;

 

3: int usermgmt_isallowforward (struct sk_buff * SKB; int direction; unsigned long pktjiffies );

Parameter description: (1) SKB;

(2) ction; packet direction, 1-uplink, 0-downlink;

(3) unsigned long pktjiffies; Package time, ptkjiffies.

Call: when the speed limit function is enabled, it is called in kernel and Dev. C.

Purpose:

Isfound = 0;

Firstunusedentry =-1;

(1) For (traverses 100 userinfo entries)

If (1 = userinfo [I]. isactive)

{

If (skbmac and userinfo [I]. Mac are the same)

{

Isfound = 1;

Break;

Indicates that the corresponding entry is found in the currently active userinfo entry.

}

}

Else (0 = userinfo [I]. isactive)

{

Firstunusedentry = I;

(Can it be optimized here? Break)

}

(2) If (0 = isfound, indicating that 1 = isactive and the MAC address is not found)

{

If (-1 = firstunusedentry) indicates that no entry = isactive is found in the traversal of (1 ).

{

Updating the status of the userinfo table sets isactive for a long time without entry (5S) to 0, and after updating the table

The value of the entry 0 = isactive is returned to firstunusedentry. If no value 0 = isactive

-1 is returned.

Firstunusedentry = usermgmt_refreshuserstatus ();

}

If (-1! = Firstunusedentry) indicates that in the userinfo table, there is no 0! = Isactive and the MAC address is the same

0 = isactive userinfo entry.

{

Because it is the first package of the new entry, SKB and return 0 are forwarded after the userinfo [firstunusedentry] status is updated;

Userinfoptr = & userinfo [firstunusedentry];

Userinfoptr-> isactive = 1;

Usermgmt_getbwlimitbyifname (& (userinfoptr-> upbwlimit ),

& (Userinfoptr-> downbwlimit ),
SKB-> Dev-> name );

}

}

 

Speed limit module functions