[Click] VLAN and Click

[Frederic Van Quickenborne]

Junhe Jian wrote:

>Hi Frederic and other click user,
>
>thank you for the fast answer @ frederic!
>if i understand u mean only with the filter of classifier does it works!
>so i have a little question:
>what does it mean the number before "/" and after "/", is the bit
>position of the complete ethernet frame with VLAN tag?
>i found something in ehter.h:
>
>struct click_arp {		/* Offsets relative to ARP (Ethernet) header */
>    uint16_t	ar_hrd;		/* 0-1 (14-15)  hardware address format      */
>#define ARPHRD_ETHER    1       /*		  Ethernet 10Mbps	     */
>    uint16_t	ar_pro;		/* 2-3 (16-17)  protocol address format      */
>    uint8_t	ar_hln;		/* 4   (18)     hardware address length      */
>    uint8_t	ar_pln;		/* 5   (19)     protocol address length      */
>    uint16_t	ar_op;		/* 6-7 (20-21)  opcode (command)	     */
>#define ARPOP_REQUEST   1       /*		  ARP request		     */
>#define ARPOP_REPLY	2       /*		  ARP reply		     */
>};
>
>struct click_ether_arp {
>struct click_arp ea_hdr;	/* 0-7 (14-21) fixed-size ARP header	 */
>    uint8_t	arp_sha[6];	/* 8-13  (22-27)  sender hardware address    */
>    uint8_t	arp_spa[4];	/* 14-17 (28-31)  sender protocol address    */
>    uint8_t	arp_tha[6];	/* 18-23 (32-37)  target hardware address    */
>    uint8_t	arp_tpa[4];	/* 24-27 (38-41)  target protocol address    */
>};
>
>
>/* Ethernet with VLAN (802.1q) */
>
>CLICK_SIZE_PACKED_STRUCTURE(
>struct click_ether_vlan {,
>uint8_t ether_dhost[6];		/* 0-5 Ethernet source address */
>uint8_t ether_shost[6];		/* 6-11 Ethernet destination address */
>    uint16_t    ether_vlan_proto;	/* 12-13 == ETHERTYPE_8021Q	      */
>uint16_t ether_vlan_tci;		/* 14-15 tag control information */
>uint16_t ether_vlan_encap_proto;	/* 16-17 Ethernet protocol	 */
>does the number of offsets ar the number before "/" and what does the
>number in "()" in ehter.h mean???
>
>if i understand "14/" is the position where VLAN packet tag control are,
>and "0002" mean the 3 priority bits of the VLAN Tag packet, but i dont
>understand the number after "%"OFFF??
>  
>
This is the mask: it means that only the bits of the mask equals 1 will 
be considered, it is a kind of a binary AND: for example
0002%0FFF, in binary
0000 0000 0000 0010 && 0000 1111 1111 1111, thus only the twelve bits on 
the right side of the 0002 will be taken into account, and not the 4 at 
the left side.

I hope this helps you a little further.

Best regards,
Frederic.

>
>anyhelp welcome!
>
>besr regards
>jian
>
>
>Am Sa 28.01.2006 09:06 schrieb Frederic Van Quickenborne
><frederic.vanquickenborne at intec2.ugent.be>:
>
>  
>
>>Hi Jian,
>>
>>you can use smart filtering in the classifier to filter your packets:
>>e.g. if you want to filter out the packets on VLAN 2 use this filer:  
>>14/0002%0FFF, if you want to map the priority, you can use one like  
>>this: 14/40%D0 (this one is for priority class 2). The hex code after
>>the '%' works as a mask for the bits you are looking for (hex code  
>>between '/' and '%') in the packet on place (given by the number  
>>before the '/'). (I'm not sure the place to look (14) is correct, it  
>>could be 13 also, if the classifier starts searching from byte 0.)
>>
>>Kind regards,
>>Frederic.
>>
>>Op 26-jan-06, om 15:33 heeft Junhe Jian het volgende geschreven:
>>
>>    
>>
>>>hi Click User!
>>>
>>>i need your help!
>>>in a project i should to do Click with VLAN support!
>>>example: a video stream server send a videostream over VLAN and use
>>>User
>>>Priority Bit from VLAN TAG for identification. and the user must
>>>have
>>>the same User Priority bit to receive the video-stream.
>>>
>>>my question:
>>>how can i use Click to mapping the User Prority Bit from VLAN TAG
>>>and
>>>redirect the packet to the user!
>>>i know i can use Classifier 12/8100 redirect the packet to a device
>>>but
>>>don't know how i can mapping the User-Priority! or i don't need to
>>>mapping coz with the right MAC-address and VLAN ID the user get
>>>their
>>>packet?
>>>any help welcome!
>>>
>>>regards
>>>jian
>>>
>>>      
>>>
>
>  
>

-- 
Frederic Van Quickenborne
Department of Information Technology (INTEC)
Ghent University - IBBT - IMEC
Gaston Crommenlaan 8 (Bus 201), B-9050 Gent, Belgium
tel.: +32-9331 4974; tel. secr.: +32-9331 4900
fax: +32-9331 4899
Frederic.VanQuickenborne at intec.ugent.be
http://www.ibcn.intec.ugent.be

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