netdev - [PATCH net-next 0/9] net: Refactor ip_route_input

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <1442962523-3974-1-git-send-email-dsa@cumulusnetworks.com>
Date:	Tue, 22 Sep 2015 15:55:14 -0700
From:	David Ahern <dsa@...ulusnetworks.com>
To:	netdev@...r.kernel.org
Cc:	David Ahern <dsa@...ulusnetworks.com>
Subject: [PATCH net-next 0/9] net: Refactor ip_route_input_slow

ip_route_input_slow is a maze of gotos (9 of them!) making it error
prone and difficult to read. This patchset refactors it, removing all
but 2 of the labels. The brd_input label for broadcast path requires
too many inputs to make a reasonble helper out of it so I left it as is.

None of these patches change functionality, only move code around
to make ip_route_input_slow more readable.

Size comparison using gcc version 4.7.2 (Debian 4.7.2-5)

With CONFIG_IP_ROUTE_VERBOSE:
    Before patches:
    $ size kbuild2/net/ipv4/route.o
       text	   data	    bss	    dec	    hex	filename
      20615	   2321	     32	  22968	   59b8	kbuild2/net/ipv4/route.o

    After patches:
    $ size kbuild/net/ipv4/route.o
       text	   data	    bss	    dec	    hex	filename
      20774	   2321	     32	  23127	   5a57	kbuild/net/ipv4/route.o

An increase of 159 bytes with CONFIG_IP_ROUTE_VERBOSE.

Without CONFIG_IP_ROUTE_VERBOSE:
    Before patches:
    $ size kbuild2/net/ipv4/route.o
       text	   data	    bss	    dec	    hex	filename
      19778	   2321	     32	  22131	   5673	kbuild2/net/ipv4/route.o

    After patches:
    $ size kbuild/net/ipv4/route.o
       text	   data	    bss	    dec	    hex	filename
      19858	   2321	     32	  22211	   56c3	kbuild/net/ipv4/route.o

An increase of 80 bytes without CONFIG_IP_ROUTE_VERBOSE.

David Ahern (9):
  net: Remove martian_source_keep_err goto label
  net: Remove e_inval label from ip_route_input_slow
  net: Remove e_nobufs label from ip_route_input_slow
  net: Move rth handling from ip_route_input_slow to helper
  net: Move martian_destination to helper
  net: Remove martian_source goto
  net: Remove martian_destination label
  net: Remove local_input label
  net: Remove no_route label

 net/ipv4/route.c | 239 ++++++++++++++++++++++++++++++++-----------------------
 1 file changed, 139 insertions(+), 100 deletions(-)

-- 
1.9.1

--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html