linux/net/netfilter/nf_queue.c, branch v2.6.35

net: add a noref bit on skb dst

2010-05-18T00:18:50Z

Use low order bit of skb->_skb_dst to tell dst is not refcounted. Change _skb_dst to _skb_refdst to make sure all uses are catched. skb_dst() returns the dst, regardless of noref bit set or not, but with a lockdep check to make sure a noref dst is not given if current user is not rcu protected. New skb_dst_set_noref() helper to set an notrefcounted dst on a skb. (with lockdep check) skb_dst_drop() drops a reference only if skb dst was refcounted. skb_dst_force() helper is used to force a refcount on dst, when skb is queued and not anymore RCU protected. Use skb_dst_force() in __sk_add_backlog(), __dev_xmit_skb() if !IFF_XMIT_DST_RELEASE or skb enqueued on qdisc queue, in sock_queue_rcv_skb(), in __nf_queue(). Use skb_dst_force() in dev_requeue_skb(). Note: dst_use_noref() still dirties dst, we might transform it later to do one dirtying per jiffies. Signed-off-by: Eric Dumazet Signed-off-by: David S. Miller

netfilter: remove unnecessary returns from void function()s

2010-05-13T13:16:27Z

This patch removes from net/ netfilter files all the unnecessary return; statements that precede the last closing brace of void functions. It does not remove the returns that are immediately preceded by a label as gcc doesn't like that. Done via: $ grep -rP --include=*.[ch] -l "return;\n}" net/ | \ xargs perl -i -e 'local $/ ; while (<>) { s/\n[ \t\n]+return;\n}/\n}/g; print; }' Signed-off-by: Joe Perches [Patrick: changed to keep return statements in otherwise empty function bodies] Signed-off-by: Patrick McHardy

include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h

2010-03-30T13:02:32Z

percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo Guess-its-ok-by: Christoph Lameter Cc: Ingo Molnar Cc: Lee Schermerhorn

netfilter: nf_queue: fix NF_STOLEN skb leak

2010-02-19T14:28:38Z

commit 3bc38712e3a6e059 (handle NF_STOP and unknown verdicts in nf_reinject) was a partial fix to packet leaks. If user asks NF_STOLEN status, we must free the skb as well. Reported-by: Afi Gjermund Signed-off-by: Eric DUmazet Signed-off-by: Patrick McHardy

netfilter: queue: use NFPROTO_ for queue callsites

2009-05-08T08:30:46Z

af is an nfproto. Signed-off-by: Jan Engelhardt

netfilter: Introduce NFPROTO_* constants

2008-10-08T09:35:00Z

The netfilter subsystem only supports a handful of protocols (much less than PF_*) and even non-PF protocols like ARP and pseudo-protocols like PF_BRIDGE. By creating NFPROTO_*, we can earn a few memory savings on arrays that previously were always PF_MAX-sized and keep the pseudo-protocols to ourselves. Signed-off-by: Jan Engelhardt Signed-off-by: Patrick McHardy

netfilter: Use unsigned types for hooknum and pf vars

2008-10-08T09:35:00Z

and (try to) consistently use u_int8_t for the L3 family. Signed-off-by: Jan Engelhardt Signed-off-by: Patrick McHardy

Remove duplicated unlikely() in IS_ERR()

2008-04-29T15:06:25Z

Some drivers have duplicated unlikely() macros. IS_ERR() already has unlikely() in itself. This patch cleans up such pointless code. Signed-off-by: Hirofumi Nakagawa Acked-by: David S. Miller Acked-by: Jeff Garzik Cc: Paul Clements Cc: Richard Purdie Cc: Alessandro Zummo Cc: David Brownell Cc: James Bottomley Cc: Michael Halcrow Cc: Anton Altaparmakov Cc: Al Viro Cc: Carsten Otte Cc: Patrick McHardy Cc: Paul Mundt Cc: Jaroslav Kysela Cc: Takashi Iwai Acked-by: Mike Frysinger Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

[NETFILTER]: Replate direct proc_fops assignment with proc_create call.

2008-03-27T23:55:53Z

This elliminates infamous race during module loading when one could lookup proc entry without proc_fops assigned. Signed-off-by: Denis V. Lunev Signed-off-by: David S. Miller

[NETFILTER]: nf_queue: don't return error when unregistering a non-existant handler

2008-03-10T23:45:05Z

Commit ce7663d84: [NETFILTER]: nfnetlink_queue: don't unregister handler of other subsystem changed nf_unregister_queue_handler to return an error when attempting to unregister a queue handler that is not identical to the one passed in. This is correct in case we really do have a different queue handler already registered, but some existing userspace code always does an unbind before bind and aborts if that fails, so try to be nice and return success in that case. Signed-off-by: Patrick McHardy Signed-off-by: David S. Miller