kernel/linux.git/net/ipv4/tunnel4.c, branch linux-4.16.y

tunnels: correct conditional build of MPLS and IPv6

2016-07-11T20:27:06+00:00

Using a combination if #if conditionals and goto labels to unwind tunnel4_init seems unwieldy. This patch takes a simpler approach of directly unregistering previously registered protocols when an error occurs. This fixes a number of problems with the current implementation including the potential presence of labels when they are unused and the potential absence of unregister code when it is needed. Fixes: 8afe97e5d416 ("tunnels: support MPLS over IPv4 tunnels") Signed-off-by: Simon Horman Signed-off-by: David S. Miller

tunnels: support MPLS over IPv4 tunnels

2016-07-09T21:45:56+00:00

Extend tunnel support to MPLS over IPv4. The implementation extends the existing differentiation between IPIP and IPv6 over IPv4 to also cover MPLS over IPv4. Signed-off-by: Simon Horman Reviewed-by: Dinan Gunawardena Signed-off-by: David S. Miller

net: Convert printks to pr_

2012-03-12T06:42:51+00:00

Use a more current kernel messaging style. Convert a printk block to print_hex_dump. Coalesce formats, align arguments. Use %s, __func__ instead of embedding function names. Some messages that were prefixed with _close are now prefixed with _fini. Some ah4 and esp messages are now not prefixed with "ip ". The intent of this patch is to later add something like #define pr_fmt(fmt) "IPv4: " fmt. to standardize the output messages. Text size is trivially reduced. (x86-32 allyesconfig) $ size net/ipv4/built-in.o* text data bss dec hex filename 887888 31558 249696 1169142 11d6f6 net/ipv4/built-in.o.new 887934 31558 249800 1169292 11d78c net/ipv4/built-in.o.old Signed-off-by: Joe Perches Signed-off-by: David S. Miller

net: use IS_ENABLED(CONFIG_IPV6)

2011-12-11T23:25:16+00:00

Instead of testing defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) Signed-off-by: Eric Dumazet Signed-off-by: David S. Miller

tunnels: add __rcu annotations

2010-10-27T18:37:32+00:00

Add __rcu annotations to : (struct ip_tunnel)->prl (struct ip_tunnel_prl_entry)->next (struct xfrm_tunnel)->next struct xfrm_tunnel *tunnel4_handlers struct xfrm_tunnel *tunnel64_handlers And use appropriate rcu primitives to reduce sparse warnings if CONFIG_SPARSE_RCU_POINTER=y Signed-off-by: Eric Dumazet Signed-off-by: David S. Miller

tunnels: missing rcu_assign_pointer()

2010-09-09T22:02:39+00:00

xfrm4_tunnel_register() & xfrm6_tunnel_register() should use rcu_assign_pointer() to make sure previous writes (to handler->next) are committed to memory before chain insertion. deregister functions dont need a particular barrier. Signed-off-by: Eric Dumazet Signed-off-by: David S. Miller

net: tunnels should use rcu_dereference

2010-09-01T17:57:53+00:00

tunnel4_handlers, tunnel64_handlers, tunnel6_handlers and tunnel46_handlers are protected by RCU, but we dont use appropriate rcu primitives to scan them. rcu_lock() is already held by caller. Signed-off-by: Eric Dumazet Signed-off-by: David S. Miller

net: struct xfrm_tunnel in read_mostly section

2010-08-30T20:50:45+00:00

tunnel4_handlers chain being scanned for each incoming packet, make sure it doesnt share an often dirtied cache line. Signed-off-by: Eric Dumazet Signed-off-by: David S. Miller

net/ipv4: EXPORT_SYMBOL cleanups

2010-07-12T19:57:54+00:00

CodingStyle cleanups EXPORT_SYMBOL should immediately follow the symbol declaration. Signed-off-by: Eric Dumazet Signed-off-by: David S. Miller

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

2010-03-30T13:02:32+00:00

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