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path: root/include/net/gre.h
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2016-08-15gre: set inner_protocol on xmitSimon Horman1-0/+1
Ensure that the inner_protocol is set on transmit so that GSO segmentation, which relies on that field, works correctly. This is achieved by setting the inner_protocol in gre_build_header rather than each caller of that function. It ensures that the inner_protocol is set when gre_fb_xmit() is used to transmit GRE which was not previously the case. I have observed this is not the case when OvS transmits GRE using lwtunnel metadata (which it always does). Fixes: 38720352412a ("gre: Use inner_proto to obtain inner header protocol") Cc: Pravin Shelar <pshelar@ovn.org> Acked-by: Alexander Duyck <alexander.h.duyck@intel.com> Signed-off-by: Simon Horman <simon.horman@netronome.com> Acked-by: Pravin B Shelar <pshelar@ovn.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-06-16gre: fix error handlerEric Dumazet1-1/+1
1) gre_parse_header() can be called from gre_err() At this point transport header points to ICMP header, not the inner header. 2) We can not really change transport header as ipgre_err() will later assume transport header still points to ICMP header (using icmp_hdr()) 3) pskb_may_pull() logic in gre_parse_header() really works if we are interested at zone pointed by skb->data 4) As Jiri explained in commit b7f8fe251e46 ("gre: do not pull header in ICMP error processing") we should not pull headers in error handler. So this fix : A) changes gre_parse_header() to use skb->data instead of skb_transport_header() B) Adds a nhs parameter to gre_parse_header() so that we can skip the not pulled IP header from error path. This offset is 0 for normal receive path. C) remove obsolete IPV6 includes Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Tom Herbert <tom@herbertland.com> Cc: Maciej Żenczykowski <maze@google.com> Cc: Jiri Benc <jbenc@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-05-12gre: Fix wrong tpi->proto in WCCPHaishuang Yan1-1/+1
When dealing with WCCP in gre6 tunnel, it sets the wrong tpi->protocol, that is, ETH_P_IP instead of ETH_P_IPV6 for the encapuslated traffic. Signed-off-by: Haishuang Yan <yanhaishuang@cmss.chinamobile.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-05-04gre: change gre_parse_header to return the header lengthJiri Benc1-1/+1
It's easier for gre_parse_header to return the header length instead of filing it into a parameter. That way, the callers that don't care about the header length can just check whether the returned value is lower than zero. In gre_err, the tunnel header must not be pulled. See commit b7f8fe251e46 ("gre: do not pull header in ICMP error processing") for details. This patch reduces the conflict between the mentioned commit and commit 95f5c64c3c13 ("gre: Move utility functions to common headers"). Signed-off-by: Jiri Benc <jbenc@redhat.com> Acked-by: Tom Herbert <tom@herbertland.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-05-03gre: Create common functions for transmitTom Herbert1-0/+44
Create common functions for both IPv4 and IPv6 GRE in transmit. These are put into gre.h. Common functions are for: - GRE checksum calculation. Move gre_checksum to gre.h. - Building a GRE header. Move GRE build_header and rename gre_build_header. Signed-off-by: Tom Herbert <tom@herbertland.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-05-03gre: Move utility functions to common headersTom Herbert1-0/+60
Several of the GRE functions defined in net/ipv4/ip_gre.c are usable for IPv6 GRE implementation (that is they are protocol agnostic). These include: - GRE flag handling functions are move to gre.h - GRE build_header is moved to gre.h and renamed gre_build_header - parse_gre_header is moved to gre_demux.c and renamed gre_parse_header - iptunnel_pull_header is taken out of gre_parse_header. This is now done by caller. The header length is returned from gre_parse_header in an int* argument. Signed-off-by: Tom Herbert <tom@herbertland.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2015-08-11gre: Remove support for sharing GRE protocol hook.Pravin B Shelar1-74/+6
Support for sharing GREPROTO_CISCO port was added so that OVS gre port and kernel GRE devices can co-exist. After flow-based tunneling patches OVS GRE protocol processing is completely moved to ip_gre module. so there is no need for GRE protocol hook. Following patch consolidates GRE protocol related functions into ip_gre module. Signed-off-by: Pravin B Shelar <pshelar@nicira.com> Acked-by: Thomas Graf <tgraf@suug.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
2015-08-11openvswitch: Use regular GRE net_device instead of vportPravin B Shelar1-10/+2
Using GRE tunnel meta data collection feature, we can implement OVS GRE vport. This patch removes all of the OVS specific GRE code and make OVS use a ip_gre net_device. Minimal GRE vport is kept to handle compatibility with current userspace application. Signed-off-by: Pravin B Shelar <pshelar@nicira.com> Acked-by: Thomas Graf <tgraf@suug.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
2014-06-05gre: Call gso_make_checksumTom Herbert1-2/+3
Call gso_make_checksum. This should have the benefit of using a checksum that may have been previously computed for the packet. This also adds NETIF_F_GSO_GRE_CSUM to differentiate devices that offload GRE GSO with and without the GRE checksum offloaed. Signed-off-by: Tom Herbert <therbert@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2014-01-07gre_offload: statically build GRE offloading supportEric Dumazet1-3/+0
GRO/GSO layers can be enabled on a node, even if said node is only forwarding packets. This patch permits GSO (and upcoming GRO) support for GRE encapsulated packets, even if the host has no GRE tunnel setup. Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: H.K. Jerry Chu <hkchu@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2013-10-20ipv4: generalize gre_handle_offloadsEric Dumazet1-1/+7
This patch makes gre_handle_offloads() more generic and rename it to iptunnel_handle_offloads() This will be used to add GSO/TSO support to IPIP tunnels. Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2013-07-04net: gre: move GSO functions to gre_offloadDaniel Borkmann1-0/+4
Similarly to TCP/UDP offloading, move all related GRE functions to gre_offload.c to make things more explicit and similar to the rest of the code. Suggested-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: Daniel Borkmann <dborkman@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2013-06-20gre: export gre_handle_offloads() function.Pravin B Shelar1-0/+1
This is required for OVS GRE offloading. Signed-off-by: Pravin B Shelar <pshelar@nicira.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2013-06-20gre: export gre_build_header() function.Pravin B Shelar1-0/+2
This is required for ovs gre module. Signed-off-by: Pravin B Shelar <pshelar@nicira.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2013-06-20gre: Allow multiple protocol listener for gre protocol.Pravin B Shelar1-0/+24
Currently there is only one user is allowed to register for gre protocol. Following patch adds de-multiplexer. So that multiple modules can listen on gre protocol e.g. kernel gre devices and ovs. Signed-off-by: Pravin B Shelar <pshelar@nicira.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2013-03-26GRE: Refactor GRE tunneling code.Pravin B Shelar1-0/+51
Following patch refactors GRE code into ip tunneling code and GRE specific code. Common tunneling code is moved to ip_tunnel module. ip_tunnel module is written as generic library which can be used by different tunneling implementations. ip_tunnel module contains following components: - packet xmit and rcv generic code. xmit flow looks like (gre_xmit/ipip_xmit)->ip_tunnel_xmit->ip_local_out. - hash table of all devices. - lookup for tunnel devices. - control plane operations like device create, destroy, ioctl, netlink operations code. - registration for tunneling modules, like gre, ipip etc. - define single pcpu_tstats dev->tstats. - struct tnl_ptk_info added to pass parsed tunnel packet parameters. ipip.h header is renamed to ip_tunnel.h Signed-off-by: Pravin B Shelar <pshelar@nicira.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-08-22PPTP: PPP over IPv4 (Point-to-Point Tunneling Protocol)Dmitry Kozlov1-0/+18
PPP: introduce "pptp" module which implements point-to-point tunneling protocol using pppox framework NET: introduce the "gre" module for demultiplexing GRE packets on version criteria (required to pptp and ip_gre may coexists) NET: ip_gre: update to use the "gre" module This patch introduces then pptp support to the linux kernel which dramatically speeds up pptp vpn connections and decreases cpu usage in comparison of existing user-space implementation (poptop/pptpclient). There is accel-pptp project (https://sourceforge.net/projects/accel-pptp/) to utilize this module, it contains plugin for pppd to use pptp in client-mode and modified pptpd (poptop) to build high-performance pptp NAS. There was many changes from initial submitted patch, most important are: 1. using rcu instead of read-write locks 2. using static bitmap instead of dynamically allocated 3. using vmalloc for memory allocation instead of BITS_PER_LONG + __get_free_pages 4. fixed many coding style issues Thanks to Eric Dumazet. Signed-off-by: Dmitry Kozlov <xeb@mail.ru> Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>