Bug #1774

Updated by tuxillo about 2 years ago

My leaf repo now has a branch called 'iphdr'.    Here's the git remote 


     [remote "dillon"] 
	     url = git:// 
	     fetch = +refs/heads/*:refs/remotes/dillon/* 


     git fetch dillon 
     git branch iphdr dillon/iphdr 
     git checkout iphdr 


     I have done basic testing with ipfw, pf, ipv4 fragmentation, 
     ipv4 TCP, a little bridging, if_tap, and ipv4 UDP. 

     Tons of other things haven't been tested yet.    ipv6, bpf filters, 
     carp, more extensive ipfw2 and pf, and so forth.    Donn't bother 
     with IPSEC, it has other issues which will have to be solved in 
     the next stage. 

     Only do testing if you have some experience with the interfaces 
     in question. 

     This branch contains the network byte ordering and adjustment fixes for 
     ip_len, ip_off, and a large chunk of the protosw cleanup.    I am going 
     to leave the branch alone except for bug fixes. 




     I am now starting work on another branch that will contain a rewrite 
     of the whole ether/ip demux and dispatch mechanic.    All protocols 
     will become per-cpu and there will be just one protocol support 
     thread for each cpu.    NETISRs will go away and be replaced with a 
     more direct netmsg queueing operation.    The toeplitz hash will be      
     integrated into the demux mechanic (probably integrated with 
     ip_lengthcheck()), so the cpu switch will occur even before a 
     protocol is handed the packet.    Fast-forwarding will still occur 
     in the demux and be able to bypass netmsg queueing. 


     Hopefully when all is said and done the combination of the stage 1 
     fixes now available and this stage 2 work will give us a huge degree 
     of flexibility with regards to managing packet mbufs, including an    
     ability to trivially requeue them (something IPSEC and other tunnel 
     implementations need to be able to do). 


     This second stage will probably take a week at least.