The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/netgraph/NOTES

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    1 $FreeBSD: stable/4/sys/netgraph/NOTES 52419 1999-10-21 09:06:11Z julian $
    2 Development ideas..
    3 
    4 Archie's suggestions... :-)
    5 
    6  - There should be a new malloc type: M_NETGRAPH
    7         [DONE]
    8         - all mallocs/frees now changed to use this.. JRE
    9         - might further split them out some time.
   10 
   11  - Use MALLOC and FREE macros instead of direct function calls
   12         [DONE]
   13         - They allow conditional compilation which keeps
   14           statistics & counters on various memory allocation
   15           (or so it seems)
   16 
   17  - In struct ng_mesg: at least make "header" into "hdr", if not
   18    getting rid of it altogether. It doesn't seem necessary and
   19    makes all my C code lines too long.
   20 
   21         - I understand.. one thought however.. consider..
   22           if char data[0] were not legal,  so that data[1] needed to be
   23           used instead, then the only way to get the size of the header
   24           would be sizeof(msg.header) as sizeof(msg) would include the dummy
   25           following bytes. this is a portability issue and I hope
   26           it will be ported eventually :)
   27 
   28         - Baloney! you can use sizeof(msg) - 1 then.. or just
   29           make it a macro, then its always portable:
   30 
   31           #ifdef __GNU_C__
   32             #define NG_MSG_HDR_SIZE     (sizeof(struct ng_message))
   33           #else
   34             #define NG_MSG_HDR_SIZE     (sizeof(struct ng_message) - 1)
   35           #endif
   36 
   37  - Have a user level program to print out and manipulate nodes, etc.
   38         - [DONE]
   39                 see ngctl
   40 
   41  - "Netgraph global" flags to turn on tracing, etc.
   42 
   43  - ngctl needs to be rewritten using libnetgraph. Also it needs a
   44    command to list all existing nodes (in case you don't know the
   45    name of what you're looking for).
   46         [DONE]
   47 
   48  - Need a way to get a list of ALL nodes.
   49         [DONE]
   50         - see NGM_LISTNODES
   51 
   52  - Enhance "netstat" to display all netgraph nodes -- or at least
   53    all netgraph socket nodes.
   54         [DONE]
   55 
   56  - BUG FIX: bind() on a socket should neither require nor allow a
   57    colon character at the end of the name. Note ngctl allows you
   58    to do it either way!
   59         [DONE] (I think)
   60 
   61  - Need to implement passing meta information through socket nodes
   62    using sendmsg() and recvmsg().
   63 
   64  - Stuff needing to be added to manual:
   65 
   66    - Awareness of SPL level, use ng_queue*() functions when necessary.
   67    - Malloc all memory with type M_NETGRAPH.
   68    - Write code so it can be an LKM or built into the kernel.. this means
   69      be careful with things like #ifdef INET.
   70    - All nodes assume that all data mbufs have the M_PKTHDR flag set!
   71      The ng_send_data() and related functions should have an
   72      #ifdef DIAGNOSTICS check to check this assumption for every mbuf.
   73    - More generally, netgraph code should make liberal use of the
   74      #ifdef DIAGNOSTICS definition.
   75    - Since data and messages are sent functionally, programmers need
   76      to watch out for infinite feedback loops. Should ng_base.c detect
   77      this automatically?
   78       - I've been thinking about this. each node could have a 'colour'
   79         which is set to the colour of the packet as you pass through.
   80         hitting a node already of your colour would abort. Each packet
   81         has another (incremented) colour.

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