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This also helps to provide a workaround for the problem described in: http://marc.info/?l=netfilter-devel&m=134519473212536&w=2 Original idea from Florian Westphal. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org> 2012-09-24netfilter: nfnetlink_queue: fix maximum packet length to userspacePablo Neira Ayuso The packets that we send via NFQUEUE are encapsulated in the NFQA_PAYLOAD attribute. The length of the packet in userspace is obtained via attr->nla_len field. This field contains the size of the Netlink attribute header plus the packet length. If the maximum packet length is specified, ie. 65535 bytes, and packets in the range of (65531,65535] are sent to userspace, the attr->nla_len overflows and it reports bogus lengths to the application. To fix this, this patch limits the maximum packet length to 65531 bytes. If larger packet length is specified, the packet that we send to user-space is truncated to 65531 bytes. To support 65535 bytes packets, we have to revisit the idea of the 32-bits Netlink attribute length. Reported-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org> 2012-09-13Merge branch 'master' of git://1984.lsi.us.es/nf-nextDavid S. Miller Pablo Neira Ayuso says: ==================== The following patchset contains four Netfilter updates, mostly targeting to fix issues added with IPv6 NAT, and one little IPVS update for net-next: * Remove unneeded conditional free of skb in nfnetlink_queue, from Wei Yongjun. * One semantic path from coccinelle detected the use of list_del + INIT_LIST_HEAD, instead of list_del_init, again from Wei Yongjun. * Fix out-of-bound memory access in the NAT address selection, from Florian Westphal. This was introduced with the IPv6 NAT patches. * Two fixes for crashes that were introduced in the recently merged IPv6 NAT support, from myself. ==================== Signed-off-by: David S. Miller <davem@davemloft.net> 2012-09-10netlink: Rename pid to portid to avoid confusionEric W. Biederman It is a frequent mistake to confuse the netlink port identifier with a process identifier. Try to reduce this confusion by renaming fields that hold port identifiers portid instead of pid. I have carefully avoided changing the structures exported to userspace to avoid changing the userspace API. I have successfully built an allyesconfig kernel with this change. Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com> Acked-by: Stephen Hemminger <shemminger@vyatta.com> Signed-off-by: David S. Miller <davem@davemloft.net> 2012-09-09netfilter: nfnetlink_queue: remove pointless conditional before kfree_skb()Wei Yongjun Remove pointless conditional before kfree_skb(). Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org> 2012-07-04netfilter: nfnetlink_queue: do not allow to set unsupported flag bitsKrishna Kumar Allow setting of only supported flag bits in queue->flags. Signed-off-by: Krishna Kumar <krkumar2@in.ibm.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org> 2012-06-26netfilter: nfnetlink_queue_core: Move away from NLMSG_PUT().David S. Miller And use nlmsg_data() while we're here too. Signed-off-by: David S. Miller <davem@davemloft.net> 2012-06-19netfilter: nfnetlink_queue: fix compilation with NF_CONNTRACK disabledPablo Neira Ayuso In "9cb0176 netfilter: add glue code to integrate nfnetlink_queue and ctnetlink" the compilation with NF_CONNTRACK disabled is broken. This patch fixes this issue. I have moved the conntrack part into nfnetlink_queue_ct.c to avoid peppering the entire nfnetlink_queue.c code with ifdefs. I also needed to rename nfnetlink_queue.c to nfnetlink_queue_pkt.c to update the net/netfilter/Makefile to support conditional compilation of the conntrack integration. This patch also adds CONFIG_NETFILTER_QUEUE_CT in case you want to explicitly disable the integration between nf_conntrack and nfnetlink_queue. Reported-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>