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* Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netDavid S. Miller2017-02-111-1/+4
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| * lwtunnel: valid encap attr check should return 0 when lwtunnel is disabledDavid Ahern2017-02-081-1/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | An error was reported upgrading to 4.9.8: root@Typhoon:~# ip route add default table 210 nexthop dev eth0 via 10.68.64.1 weight 1 nexthop dev eth0 via 10.68.64.2 weight 1 RTNETLINK answers: Operation not supported The problem occurs when CONFIG_LWTUNNEL is not enabled and a multipath route is submitted. The point of lwtunnel_valid_encap_type_attr is catch modules that need to be loaded before any references are taken with rntl held. With CONFIG_LWTUNNEL disabled, there will be no modules to load so the lwtunnel_valid_encap_type_attr stub should just return 0. Fixes: 9ed59592e3e3 ("lwtunnel: fix autoload of lwt modules") Reported-by: pupilla@libero.it Signed-off-by: David Ahern <dsa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | lwtunnel: remove device arg to lwtunnel_build_stateDavid Ahern2017-01-301-3/+3
|/ | | | | | | | Nothing about lwt state requires a device reference, so remove the input argument. Signed-off-by: David Ahern <dsa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: Specify the owning module for lwtunnel opsRobert Shearman2017-01-241-0/+2
| | | | | | | | | Modules implementing lwtunnel ops should not be allowed to unload while there is state alive using those ops, so specify the owning module for all lwtunnel ops. Signed-off-by: Robert Shearman <rshearma@brocade.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* lwtunnel: fix autoload of lwt modulesDavid Ahern2017-01-181-0/+11
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Trying to add an mpls encap route when the MPLS modules are not loaded hangs. For example: CONFIG_MPLS=y CONFIG_NET_MPLS_GSO=m CONFIG_MPLS_ROUTING=m CONFIG_MPLS_IPTUNNEL=m $ ip route add 10.10.10.10/32 encap mpls 100 via inet 10.100.1.2 The ip command hangs: root 880 826 0 21:25 pts/0 00:00:00 ip route add 10.10.10.10/32 encap mpls 100 via inet 10.100.1.2 $ cat /proc/880/stack [<ffffffff81065a9b>] call_usermodehelper_exec+0xd6/0x134 [<ffffffff81065efc>] __request_module+0x27b/0x30a [<ffffffff814542f6>] lwtunnel_build_state+0xe4/0x178 [<ffffffff814aa1e4>] fib_create_info+0x47f/0xdd4 [<ffffffff814ae451>] fib_table_insert+0x90/0x41f [<ffffffff814a8010>] inet_rtm_newroute+0x4b/0x52 ... modprobe is trying to load rtnl-lwt-MPLS: root 881 5 0 21:25 ? 00:00:00 /sbin/modprobe -q -- rtnl-lwt-MPLS and it hangs after loading mpls_router: $ cat /proc/881/stack [<ffffffff81441537>] rtnl_lock+0x12/0x14 [<ffffffff8142ca2a>] register_netdevice_notifier+0x16/0x179 [<ffffffffa0033025>] mpls_init+0x25/0x1000 [mpls_router] [<ffffffff81000471>] do_one_initcall+0x8e/0x13f [<ffffffff81119961>] do_init_module+0x5a/0x1e5 [<ffffffff810bd070>] load_module+0x13bd/0x17d6 ... The problem is that lwtunnel_build_state is called with rtnl lock held preventing mpls_init from registering. Given the potential references held by the time lwtunnel_build_state it can not drop the rtnl lock to the load module. So, extract the module loading code from lwtunnel_build_state into a new function to validate the encap type. The new function is called while converting the user request into a fib_config which is well before any table, device or fib entries are examined. Fixes: 745041e2aaf1 ("lwtunnel: autoload of lwt modules") Signed-off-by: David Ahern <dsa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* lwtunnel: subtract tunnel headroom from mtu on output redirectDavid Lebrun2016-11-161-1/+2
| | | | | | | | | | | | | This patch changes the lwtunnel_headroom() function which is called in ipv4_mtu() and ip6_mtu(), to also return the correct headroom value when the lwtunnel state is OUTPUT_REDIRECT. This patch enables e.g. SR-IPv6 encapsulations to work without manually setting the route mtu. Acked-by: Roopa Prabhu <roopa@cumulusnetworks.com> Signed-off-by: David Lebrun <david.lebrun@uclouvain.be> Signed-off-by: David S. Miller <davem@davemloft.net>
* lwt: Remove unused len fieldThomas Graf2016-10-231-2/+1
| | | | | | | The field is initialized by ILA and MPLS but never used. Remove it. Signed-off-by: Thomas Graf <tgraf@suug.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
* lwtunnel: Add destroy state operationTom Herbert2016-10-151-4/+3
| | | | | | | | | | | | Users of lwt tunnels may set up some secondary state in build_state function. Add a corresponding destroy_state function to allow users to clean up state. This destroy state function is called from lwstate_free. Also, we now free lwstate using kfree_rcu so user can assume structure is not freed before rcu. Acked-by: Roopa Prabhu <roopa@cumulusnetworks.com> Signed-off-by: Tom Herbert <tom@herbertland.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: lwtunnel: Handle fragmentationRoopa Prabhu2016-08-301-0/+44
| | | | | | | | | | | | | | | | | | | | | | | | Today mpls iptunnel lwtunnel_output redirect expects the tunnel output function to handle fragmentation. This is ok but can be avoided if we did not do the mpls output redirect too early. ie we could wait until ip fragmentation is done and then call mpls output for each ip fragment. To make this work we will need, 1) the lwtunnel state to carry encap headroom 2) and do the redirect to the encap output handler on the ip fragment (essentially do the output redirect after fragmentation) This patch adds tunnel headroom in lwtstate to make sure we account for tunnel data in mtu calculations during fragmentation and adds new xmit redirect handler to redirect to lwtunnel xmit func after ip fragmentation. This includes IPV6 and some mtu fixes and testing from David Ahern. Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com> Signed-off-by: David Ahern <dsa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* lwtunnel: autoload of lwt modulesRobert Shearman2016-02-211-1/+3
| | | | | | | | | | | | | | | | | | | The lwt implementations using net devices can autoload using the existing mechanism using IFLA_INFO_KIND. However, there's no mechanism that lwt modules not using net devices can use. Therefore, add the ability to autoload modules registering lwt operations for lwt implementations not using a net device so that users don't have to manually load the modules. Only users with the CAP_NET_ADMIN capability can cause modules to be loaded, which is ensured by rtnetlink_rcv_msg rejecting non-RTM_GETxxx messages for users without this capability, and by lwtunnel_build_state not being called in response to RTM_GETxxx messages. Signed-off-by: Robert Shearman <rshearma@brocade.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* dst: Pass net into dst->outputEric W. Biederman2015-10-081-4/+4
| | | | | | | | The network namespace is already passed into dst_output pass it into dst->output lwt->output and friends. Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* lwt: Add cfg argument to build_stateTom Herbert2015-08-241-0/+3
| | | | | | | | | | | | | Add cfg and family arguments to lwt build state functions. cfg is a void pointer and will either be a pointer to a fib_config or fib6_config structure. The family parameter indicates which one (either AF_INET or AF_INET6). LWT encpasulation implementation may use the fib configuration to build the LWT state. Signed-off-by: Tom Herbert <tom@herbertland.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* route: move lwtunnel state to dst_entryJiri Benc2015-08-201-12/+0
| | | | | | | | | | | | | | | Currently, the lwtunnel state resides in per-protocol data. This is a problem if we encapsulate ipv6 traffic in an ipv4 tunnel (or vice versa). The xmit function of the tunnel does not know whether the packet has been routed to it by ipv4 or ipv6, yet it needs the lwtstate data. Moving the lwtstate data to dst_entry makes such inter-protocol tunneling possible. As a bonus, this brings a nice diffstat. Signed-off-by: Jiri Benc <jbenc@redhat.com> Acked-by: Roopa Prabhu <roopa@cumulusnetworks.com> Acked-by: Thomas Graf <tgraf@suug.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
* lwtunnel: Fix the sparse warnings in fib_encap_matchYing Xue2015-08-191-0/+4
| | | | | | | | | | | | | | | | | | | | | | | | | When CONFIG_LWTUNNEL config is not enabled, the lwtstate_free() is not declared in lwtunnel.h at all. However, even in this case, the function is still referenced in fib_semantics.c so that there appears the following sparse warnings: net/ipv4/fib_semantics.c:553:17: error: undefined identifier 'lwtstate_free' CC net/ipv4/fib_semantics.o net/ipv4/fib_semantics.c: In function ‘fib_encap_match’: net/ipv4/fib_semantics.c:553:3: error: implicit declaration of function ‘lwtstate_free’ [-Werror=implicit-function-declaration] cc1: some warnings being treated as errors make[1]: *** [net/ipv4/fib_semantics.o] Error 1 make: *** [net/ipv4/fib_semantics.o] Error 2 To eliminate the error, we define an empty function for lwtstate_free() in lwtunnel.h when CONFIG_LWTUNNEL is disabled. Fixes: df383e6240ef ("lwtunnel: fix memory leak") Cc: Jiri Benc <jbenc@redhat.com> Reported-by: kbuild test robot <fengguang.wu@intel.com> Signed-off-by: Ying Xue <ying.xue@windriver.com> Acked-by: Jiri Benc <jbenc@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* lwtunnel: fix memory leakJiri Benc2015-08-181-1/+6
| | | | | | | | | The built lwtunnel_state struct has to be freed after comparison. Fixes: 571e722676fe3 ("ipv4: support for fib route lwtunnel encap attributes") Signed-off-by: Jiri Benc <jbenc@redhat.com> Acked-by: Roopa Prabhu <roopa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* lwt: Add support to redirect dst.inputTom Herbert2015-08-171-1/+29
| | | | | | | | | | | | This patch adds the capability to redirect dst input in the same way that dst output is redirected by LWT. Also, save the original dst.input and and dst.out when setting up lwtunnel redirection. These can be called by the client as a pass- through. Signed-off-by: Tom Herbert <tom@herbertland.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* lwtunnel: Make lwtun_encaps[] staticThomas Graf2015-07-291-3/+0
| | | | | | | | | | Any external user should use the registration API instead of accessing this directly. Cc: Roopa Prabhu <roopa@cumulusnetworks.com> Signed-off-by: Thomas Graf <tgraf@suug.ch> Acked-by: Roopa Prabhu <roopa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* lwtunnel: change prototype of lwtunnel_state_get()Nicolas Dichtel2015-07-271-5/+11
| | | | | | | | | | | | | | | It saves some lines and simplify a bit the code when the state is returning by this function. It's also useful to handle a NULL entry. To avoid too long lines, I've also renamed lwtunnel_state_get() and lwtunnel_state_put() to lwtstate_get() and lwtstate_put(). CC: Thomas Graf <tgraf@suug.ch> CC: Roopa Prabhu <roopa@cumulusnetworks.com> Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com> Acked-by: Thomas Graf <tgraf@suug.ch> Acked-by: Roopa Prabhu <roopa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* lwtunnel: support dst output redirect functionRoopa Prabhu2015-07-211-0/+12
| | | | | | | | | | | | This patch introduces lwtunnel_output function to call corresponding lwtunnels output function to xmit the packet. It adds two variants lwtunnel_output and lwtunnel_output6 for ipv4 and ipv6 respectively today. But this is subject to change when lwtstate will reside in dst or dst_metadata (as per upstream discussions). Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* lwtunnel: infrastructure for handling light weight tunnels like mplsRoopa Prabhu2015-07-211-0/+132
Provides infrastructure to parse/dump/store encap information for light weight tunnels like mpls. Encap information for such tunnels is associated with fib routes. This infrastructure is based on previous suggestions from Eric Biederman to follow the xfrm infrastructure. Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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