June 2008 - Darwin-kernel - lists.apple.com

Re: Accessing ifnet
by Michael Tüxen 06 Jun '08

06 Jun '08

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Hi Adi, comments in-line. Best regards Michael On Jun 6, 2008, at 4:21 PM, Adi Masputra wrote: On Jun 6, 2008, at 1:17 AM, Michael Tüxen wrote: _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… Loop through all interfaces and addresses and add or delete them to our own list of addresses. I guess that I could also use a kernel socket and an ioctl to get the information, but the code is shared between the FreeBSD kernel, other platforms and Mac OS X. I'm trying to keep the platform specific code minimal... Have you looked at ifnet_list_get/ifnet_list_free KPI in <net/ kpi_interface.h>? No, I'll do. SIOCGIFCONF is not for a kernel ioctl client. OK. Did not get this out of the documentation... Adi This email sent to site_archiver(a)lists.apple.com

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Using KPIs, was Accessing ifnet
by Rick Macklem 06 Jun '08

06 Jun '08

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com I'm not sure, but I have a hunch that Michael might be in a similar situation as I am. In any case, let me hypothetically assume that he is. --> Developing open source for BSD kernels, ported to several major variants (Free, Open, Mac OS X, ...) non-commercially. When you are in this situation, there is a constant tradeoff between using the Apple KPIs vs maintaining a common code base for all the BSD variants you are ported to. Personally, I've grown rather fond of the Apple KPIs and would be happy to see other BSD variants adopt them, but that just ain't gonna happen. Just thought I'd throw in this perspective, rick _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… I've ended up with a compromise, where I use the KPIs when it is easy to do so (and easy to replace the calls with generic BSD code like vp->v_type, if the core team for that variant deems it necessary) and going beyond/around the KPIs when I can create a code base that works on all the variants I'm ported to, using macros and other tricks. And, yes, it is only appropriate for folks in the open source, non-commercial camp, like me. This email sent to site_archiver(a)lists.apple.com

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Re: Accessing ifnet
by Rick Macklem 06 Jun '08

06 Jun '08

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com On Fri, 6 Jun 2008, Josh Graessley wrote: On Jun 6, 2008, at 10:02 AM, Rick Macklem wrote: As OSBundleLibraries I use com.apple.kernel. I do know that I'm using unsupported API... but is there a way to use the mutex routines? rick _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… [stuff snipped] [more stuff snipped] You can also bypass the safety on your food processor and get it to run while the lid is off and reach your hand in but I wouldn't recommend it. 1) In order to get your kext to link, you'll have to declare a dependency on the exact version of the kernel, which means your kext will only work with one specific version of Mac OS X. Every software update will break your product. Yep, but he noted that he was linking against com.apple.kernel and that he knew he was using unsupported APIs. (The local laundromat has front loading washers with a safety device on them so people won't open the door while it's running. I suppose there is someone out there who would open it and dump water all over the floor, but it's a real pain when it decides not to release when your laundry is done and you can't get the dang thing to open;-) 2) There's a better way. There are a whole set of KPIs to do whatever you are likely to be trying to do. They will take and drop any appropriate locks for you. Agreed, of course. If he can do what he wants with a KPI, then that would be a better solution. (I had assumed, quite possibly incorrectly, that he had already decided that the KPIs weren't sufficient for what he was doing.) This email sent to site_archiver(a)lists.apple.com

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Re: Accessing ifnet
by Josh Graessley 06 Jun '08

06 Jun '08

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com On Jun 6, 2008, at 10:02 AM, Rick Macklem wrote: On Fri, 6 Jun 2008, Michael TÃ¼xen wrote: Dear all, in an NKE I'm using code like TAILQ_FOREACH(ifn, &ifnet, if_list) { /* Do something with ifn */ } and need to protect it by ifnet_head_lock_shared(); TAILQ_FOREACH(ifn, &ifnet, if_list) { /* Do something with ifn */ } ifnet_head_done(); but the kextload reports kld(): Undefined symbols: _ifnet_head_done _ifnet_head_lock_shared As OSBundleLibraries I use com.apple.kernel. I do know that I'm using unsupported API... but is there a way to use the mutex routines? To the best of my knowledge, you can't link to those routines, because they aren't in the mach_kernel's symbol table. However, so long as you abide by the terms of the APSL, you can crib them from the sources and put them in your Kext. (I'm assuming you already understand the risks associated with doing this, such as "Apple could change them for any release and you code will then be broken".) -josh _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… If you download xnu-1228 sources, look in bsd/net/dlil.c for them. You can also bypass the safety on your food processor and get it to run while the lid is off and reach your hand in but I wouldn't recommend it. 1) In order to get your kext to link, you'll have to declare a dependency on the exact version of the kernel, which means your kext will only work with one specific version of Mac OS X. Every software update will break your product. 2) There's a better way. There are a whole set of KPIs to do whatever you are likely to be trying to do. They will take and drop any appropriate locks for you. This email sent to site_archiver(a)lists.apple.com

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Re: Accessing ifnet
by Vincent Lubet 06 Jun '08

06 Jun '08

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com For example: #include <net/kpi_interface.h> .... Vincent On Jun 6, 2008, at 7:21 AM, Adi Masputra wrote: On Jun 6, 2008, at 1:17 AM, Michael Tüxen wrote: _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… errno_t printf_ifnets(void) { errno_t error = 0; ifnet_t *ifnetlist = 0, ifp; u_int32_t n, count; error = ifnet_list_get(IFNET_FAMILY_ANY, &ifnetlist, &count); if (error != 0) { printf("ifnet_list_get failed %d\n", error); goto out; } for (n = 0; n < count; n++) { ifp = ifnetlist[n]; printf("ifp %p index: %d name: %s unit: %d family: %d type: %d flags: %08x\n", ifp, ifnet_index(ifp), ifnet_name(ifp), ifnet_unit(ifp), ifnet_family(ifp), ifnet_type(ifp), ifnet_flags(ifp) ); } out: if (ifnetlist != 0) ifnet_list_free(ifnetlist); return error; } Loop through all interfaces and addresses and add or delete them to our own list of addresses. I guess that I could also use a kernel socket and an ioctl to get the information, but the code is shared between the FreeBSD kernel, other platforms and Mac OS X. I'm trying to keep the platform specific code minimal... Have you looked at ifnet_list_get/ifnet_list_free KPI in <net/ kpi_interface.h>? SIOCGIFCONF is not for a kernel ioctl client. Adi _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/vlubet %40apple.com This email sent to vlubet(a)apple.com This email sent to site_archiver(a)lists.apple.com

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Re: Accessing ifnet
by Rick Macklem 06 Jun '08

06 Jun '08

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com On Fri, 6 Jun 2008, Michael T??xen wrote: Dear all, in an NKE I'm using code like TAILQ_FOREACH(ifn, &ifnet, if_list) { /* Do something with ifn */ } and need to protect it by ifnet_head_lock_shared(); TAILQ_FOREACH(ifn, &ifnet, if_list) { /* Do something with ifn */ } ifnet_head_done(); but the kextload reports kld(): Undefined symbols: _ifnet_head_done _ifnet_head_lock_shared As OSBundleLibraries I use com.apple.kernel. I do know that I'm using unsupported API... but is there a way to use the mutex routines? To the best of my knowledge, you can't link to those routines, because they aren't in the mach_kernel's symbol table. However, so long as you abide by the terms of the APSL, you can crib them from the sources and put them in your Kext. (I'm assuming you already understand the risks associated with doing this, such as "Apple could change them for any release and you code will then be broken".) If you download xnu-1228 sources, look in bsd/net/dlil.c for them. _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… This email sent to site_archiver(a)lists.apple.com rick

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Re: Accessing ifnet
by Adi Masputra 06 Jun '08

06 Jun '08

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com On Jun 6, 2008, at 1:17 AM, Michael Tüxen wrote: Adi _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… This email sent to site_archiver(a)lists.apple.com Loop through all interfaces and addresses and add or delete them to our own list of addresses. I guess that I could also use a kernel socket and an ioctl to get the information, but the code is shared between the FreeBSD kernel, other platforms and Mac OS X. I'm trying to keep the platform specific code minimal... Have you looked at ifnet_list_get/ifnet_list_free KPI in <net/ kpi_interface.h>? SIOCGIFCONF is not for a kernel ioctl client. smime.p7s

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Re: Accessing ifnet
by Michael Tüxen 06 Jun '08

06 Jun '08

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com On Jun 6, 2008, at 10:01 AM, Adi Masputra wrote: On Jun 6, 2008, at 12:29 AM, Michael Tüxen wrote: Dear all, in an NKE I'm using code like TAILQ_FOREACH(ifn, &ifnet, if_list) { /* Do something with ifn */ } and need to protect it by ifnet_head_lock_shared(); TAILQ_FOREACH(ifn, &ifnet, if_list) { /* Do something with ifn */ } ifnet_head_done(); but the kextload reports kld(): Undefined symbols: _ifnet_head_done _ifnet_head_lock_shared As OSBundleLibraries I use com.apple.kernel. I do know that I'm using unsupported API... but is there a way to use the mutex routines? Adi Best regards Michael _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/adi%40apple.com _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… Not really; it's not supported. What are you trying achieve in the first place? Loop through all interfaces and addresses and add or delete them to our own list of addresses. I guess that I could also use a kernel socket and an ioctl to get the information, but the code is shared between the FreeBSD kernel, other platforms and Mac OS X. I'm trying to keep the platform specific code minimal... I know that I'm using an unsupported API. It is part of a NKE which implements a transport protocol (SCTP). This is not possible using only supported APIs, but it currently works (and might break in the future, I know). This email sent to adi(a)apple.com This email sent to site_archiver(a)lists.apple.com

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Re: Accessing ifnet
by Adi Masputra 06 Jun '08

06 Jun '08

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com On Jun 6, 2008, at 12:29 AM, Michael Tüxen wrote: Dear all, in an NKE I'm using code like TAILQ_FOREACH(ifn, &ifnet, if_list) { /* Do something with ifn */ } and need to protect it by ifnet_head_lock_shared(); TAILQ_FOREACH(ifn, &ifnet, if_list) { /* Do something with ifn */ } ifnet_head_done(); but the kextload reports kld(): Undefined symbols: _ifnet_head_done _ifnet_head_lock_shared As OSBundleLibraries I use com.apple.kernel. I do know that I'm using unsupported API... but is there a way to use the mutex routines? Adi Best regards Michael _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/adi%40apple.com _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… This email sent to site_archiver(a)lists.apple.com Not really; it's not supported. What are you trying achieve in the first place? This email sent to adi(a)apple.com smime.p7s

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Accessing ifnet
by Michael Tüxen 06 Jun '08

06 Jun '08

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Dear all, in an NKE I'm using code like TAILQ_FOREACH(ifn, &ifnet, if_list) { /* Do something with ifn */ } and need to protect it by ifnet_head_lock_shared(); TAILQ_FOREACH(ifn, &ifnet, if_list) { /* Do something with ifn */ } ifnet_head_done(); but the kextload reports kld(): Undefined symbols: _ifnet_head_done _ifnet_head_lock_shared As OSBundleLibraries I use com.apple.kernel. I do know that I'm using unsupported API... but is there a way to use the mutex routines? Best regards Michael _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… This email sent to site_archiver(a)lists.apple.com

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