Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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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 were not legal, so that data 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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