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2013-06-12gro: remove a sparse errorEric Dumazet1-1/+1
Fix following sparse error : net/ipv4/af_inet.c:1410:59: warning: restricted __be16 degrades to integer added in commit db8caf3dbc77599 ("gro: should aggregate frames without DF") Reported-by: kbuild test robot <fengguang.wu@intel.com> From: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2013-06-12net: udp4: move GSO functions to udp_offloadDaniel Borkmann1-8/+1
Similarly to TCP offloading and UDPv6 offloading, move all related UDPv4 functions to udp_offload.c to make things more explicit. Also, by this, we can make those functions static. Signed-off-by: Daniel Borkmann <dborkman@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2013-06-07net: tcp: move GRO/GSO functions to tcp_offloadDaniel Borkmann1-11/+2
Would be good to make things explicit and move those functions to a new file called tcp_offload.c, thus make this similar to tcpv6_offload.c. While moving all related functions into tcp_offload.c, we can also make some of them static, since they are only used there. Also, add an explicit registration function. Suggested-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: Daniel Borkmann <dborkman@redhat.com> Acked-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2013-05-31gro: should aggregate frames without DFEric Dumazet1-1/+2
GRO on IPv4 doesn't aggregate frames if they don't have DF bit set. Some servers use IP_MTU_DISCOVER/IP_PMTUDISC_PROBE, so linux receivers are unable to aggregate this kind of traffic. The right thing to do is to allow aggregation as long as the DF bit has same value on all segments. bnx2x LRO does this correctly. Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Jerry Chu <hkchu@google.com> Cc: Herbert Xu <herbert@gondor.apana.org.au> Cc: Ben Hutchings <bhutchings@solarflare.com> Reviewed-by: Ben Hutchings <bhutchings@solarflare.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2013-05-27MPLS: Add limited GSO supportSimon Horman1-0/+1
In the case where a non-MPLS packet is received and an MPLS stack is added it may well be the case that the original skb is GSO but the NIC used for transmit does not support GSO of MPLS packets. The aim of this code is to provide GSO in software for MPLS packets whose skbs are GSO. SKB Usage: When an implementation adds an MPLS stack to a non-MPLS packet it should do the following to skb metadata: * Set skb->inner_protocol to the old non-MPLS ethertype of the packet. skb->inner_protocol is added by this patch. * Set skb->protocol to the new MPLS ethertype of the packet. * Set skb->network_header to correspond to the end of the L3 header, including the MPLS label stack. I have posted a patch, "[PATCH v3.29] datapath: Add basic MPLS support to kernel" which adds MPLS support to the kernel datapath of Open vSwtich. That patch sets the above requirements in datapath/actions.c:push_mpls() and was used to exercise this code. The datapath patch is against the Open vSwtich tree but it is intended that it be added to the Open vSwtich code present in the mainline Linux kernel at some point. Features: I believe that the approach that I have taken is at least partially consistent with the handling of other protocols. Jesse, I understand that you have some ideas here. I am more than happy to change my implementation. This patch adds dev->mpls_features which may be used by devices to advertise features supported for MPLS packets. A new NETIF_F_MPLS_GSO feature is added for devices which support hardware MPLS GSO offload. Currently no devices support this and MPLS GSO always falls back to software. Alternate Implementation: One possible alternate implementation is to teach netif_skb_features() and skb_network_protocol() about MPLS, in a similar way to their understanding of VLANs. I believe this would avoid the need for net/mpls/mpls_gso.c and in particular the calls to __skb_push() and __skb_push() in mpls_gso_segment(). I have decided on the implementation in this patch as it should not introduce any overhead in the case where mpls_gso is not compiled into the kernel or inserted as a module. MPLS GSO suggested by Jesse Gross. Based in part on "v4 GRE: Add TCP segmentation offload for GRE" by Pravin B Shelar. Cc: Jesse Gross <jesse@nicira.com> Cc: Pravin B Shelar <pshelar@nicira.com> Signed-off-by: Simon Horman <horms@verge.net.au> Signed-off-by: David S. Miller <davem@davemloft.net>
2013-05-03gre: Fix GREv4 TCPv6 segmentation.Pravin B Shelar1-0/+1
For ipv6 traffic, GRE can generate packet with strange GSO bits, e.g. ipv4 packet with SKB_GSO_TCPV6 flag set. Therefore following patch relaxes check in inet gso handler to allow such packet for segmentation. This patch also fixes wrong skb->protocol set that was done in gre_gso_segment() handler. Reported-by: Steinar H. Gunderson <sesse@google.com> CC: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: Pravin B Shelar <pshelar@nicira.com> Acked-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2013-04-29net: defer net_secret[] initializationEric Dumazet1-1/+4
Instead of feeding net_secret[] at boot time, defer the init at the point first socket is created. This permits some platforms to use better entropy sources than the ones available at boot time. Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2013-03-26GRE: Refactor GRE tunneling code.Pravin B Shelar1-1/+0
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>
2013-03-25ipv4: Fix ip-header identification for gso packets.Pravin B Shelar1-2/+1
ip-header id needs to be incremented even if IP_DF flag is set. This behaviour was changed in commit 490ab08127cebc25e3a26 (IP_GRE: Fix IP-Identification). Following patch fixes it so that identification is always incremented. Reported-by: Cong Wang <amwang@redhat.com> Acked-by: Cong Wang <amwang@redhat.com> Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
2013-03-09tunneling: Add generic Tunnel segmentation.Pravin B Shelar1-1/+5
Adds generic tunneling offloading support for IPv4-UDP based tunnels. GSO type is added to request this offload for a skb. netdev feature NETIF_F_UDP_TUNNEL is added for hardware offloaded udp-tunnel support. Currently no device supports this feature, software offload is used. This can be used by tunneling protocols like VXLAN. CC: Jesse Gross <jesse@nicira.com> Signed-off-by: Pravin B Shelar <pshelar@nicira.com> Acked-by: Stephen Hemminger <stephen@networkplumber.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2013-03-09net: Kill link between CSUM and SG features.Pravin B Shelar1-3/+0
Earlier SG was unset if CSUM was not available for given device to force skb copy to avoid sending inconsistent csum. Commit c9af6db4c11c (net: Fix possible wrong checksum generation) added explicit flag to force copy to fix this issue. Therefore there is no need to link SG and CSUM, following patch kills this link between there two features. This patch is also required following patch in series. Signed-off-by: Pravin B Shelar <pshelar@nicira.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2013-02-25IP_GRE: Fix IP-Identification.Pravin B Shelar1-2/+4
GRE-GSO generates ip fragments with id 0,2,3,4... for every GSO packet, which is not correct. Following patch fixes it by setting ip-header id unique id of fragments are allowed. As Eric Dumazet suggested it is optimized by using inner ip-header whenever inner packet is ipv4. Signed-off-by: Pravin B Shelar <pshelar@nicira.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2013-02-22ipv4: fix error handling in icmp_protocol.Li Wei1-1/+1
Now we handle icmp errors in each transport protocol's err_handler, for icmp protocols, that is ping_err. Since this handler only care of those icmp errors triggered by echo request, errors triggered by echo reply(which sent by kernel) are sliently ignored. So wrap ping_err() with icmp_err() to deal with those icmp errors. Signed-off-by: Li Wei <lw@cn.fujitsu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2013-02-21ipv6: use a stronger hash for tcpEric Dumazet1-2/+7
It looks like its possible to open thousands of TCP IPv6 sessions on a server, all landing in a single slot of TCP hash table. Incoming packets have to lookup sockets in a very long list. We should hash all bits from foreign IPv6 addresses, using a salt and hash mix, not a simple XOR. inet6_ehashfn() can also separately use the ports, instead of xoring them. Reported-by: Neal Cardwell <ncardwell@google.com> Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Yuchung Cheng <ycheng@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2013-02-15v4 GRE: Add TCP segmentation offload for GREPravin B Shelar1-0/+1
Following patch adds GRE protocol offload handler so that skb_gso_segment() can segment GRE packets. SKB GSO CB is added to keep track of total header length so that skb_segment can push entire header. e.g. in case of GRE, skb_segment need to push inner and outer headers to every segment. New NETIF_F_GRE_GSO feature is added for devices which support HW GRE TSO offload. Currently none of devices support it therefore GRE GSO always fall backs to software GSO. [ Compute pkt_len before ip_local_out() invocation. -DaveM ] Signed-off-by: Pravin B Shelar <pshelar@nicira.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2013-02-13net: Fix possible wrong checksum generation.Pravin B Shelar1-1/+0
Patch cef401de7be8c4e (net: fix possible wrong checksum generation) fixed wrong checksum calculation but it broke TSO by defining new GSO type but not a netdev feature for that type. net_gso_ok() would not allow hardware checksum/segmentation offload of such packets without the feature. Following patch fixes TSO and wrong checksum. This patch uses same logic that Eric Dumazet used. Patch introduces new flag SKBTX_SHARED_FRAG if at least one frag can be modified by the user. but SKBTX_SHARED_FRAG flag is kept in skb shared info tx_flags rather than gso_type. tx_flags is better compared to gso_type since we can have skb with shared frag without gso packet. It does not link SHARED_FRAG to GSO, So there is no need to define netdev feature for this. Signed-off-by: Pravin B Shelar <pshelar@nicira.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2013-02-05ipv4: Disallow non-namespace aware protocols to register.David S. Miller1-19/+0
All in-tree ipv4 protocol implementations are now namespace aware. Therefore all the run-time checks are superfluous. Reject registry of any non-namespace aware ipv4 protocol. Eventually we'll remove prot->netns_ok and this registry time check as well. Signed-off-by: David S. Miller <davem@davemloft.net>
2013-01-28net: fix possible wrong checksum generationEric Dumazet1-0/+1
Pravin Shelar mentioned that GSO could potentially generate wrong TX checksum if skb has fragments that are overwritten by the user between the checksum computation and transmit. He suggested to linearize skbs but this extra copy can be avoided for normal tcp skbs cooked by tcp_sendmsg(). This patch introduces a new SKB_GSO_SHARED_FRAG flag, set in skb_shinfo(skb)->gso_type if at least one frag can be modified by the user. Typical sources of such possible overwrites are {vm}splice(), sendfile(), and macvtap/tun/virtio_net drivers. Tested: $ netperf -H 7.7.8.84 MIGRATED TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 7.7.8.84 () port 0 AF_INET Recv Send Send Socket Socket Message Elapsed Size Size Size Time Throughput bytes bytes bytes secs. 10^6bits/sec 87380 16384 16384 10.00 3959.52 $ netperf -H 7.7.8.84 -t TCP_SENDFILE TCP SENDFILE TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 7.7.8.84 () port 0 AF_INET Recv Send Send Socket Socket Message Elapsed Size Size Size Time Throughput bytes bytes bytes secs. 10^6bits/sec 87380 16384 16384 10.00 3216.80 Performance of the SENDFILE is impacted by the extra allocation and copy, and because we use order-0 pages, while the TCP_STREAM uses bigger pages. Reported-by: Pravin Shelar <pshelar@nicira.com> Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2013-01-22ipv4: Use IS_ERR_OR_NULL().YOSHIFUJI Hideaki / 吉藤英明1-1/+1
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2013-01-09ipv4: Use FIELD_SIZEOF() in inet_init().YOSHIFUJI Hideaki / 吉藤英明1-2/+1
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-11-18net: Make CAP_NET_BIND_SERVICE per user namespaceEric W. Biederman1-2/+4
Allow privileged users in any user namespace to bind to privileged sockets in network namespaces they control. Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-11-18net: Allow userns root to control ipv4Eric W. Biederman1-1/+2
Allow an unpriviled user who has created a user namespace, and then created a network namespace to effectively use the new network namespace, by reducing capable(CAP_NET_ADMIN) and capable(CAP_NET_RAW) calls to be ns_capable(net->user_ns, CAP_NET_ADMIN), or capable(net->user_ns, CAP_NET_RAW) calls. Settings that merely control a single network device are allowed. Either the network device is a logical network device where restrictions make no difference or the network device is hardware NIC that has been explicity moved from the initial network namespace. In general policy and network stack state changes are allowed while resource control is left unchanged. Allow creating raw sockets. Allow the SIOCSARP ioctl to control the arp cache. Allow the SIOCSIFFLAG ioctl to allow setting network device flags. Allow the SIOCSIFADDR ioctl to allow setting a netdevice ipv4 address. Allow the SIOCSIFBRDADDR ioctl to allow setting a netdevice ipv4 broadcast address. Allow the SIOCSIFDSTADDR ioctl to allow setting a netdevice ipv4 destination address. Allow the SIOCSIFNETMASK ioctl to allow setting a netdevice ipv4 netmask. Allow the SIOCADDRT and SIOCDELRT ioctls to allow adding and deleting ipv4 routes. Allow the SIOCADDTUNNEL, SIOCCHGTUNNEL and SIOCDELTUNNEL ioctls for adding, changing and deleting gre tunnels. Allow the SIOCADDTUNNEL, SIOCCHGTUNNEL and SIOCDELTUNNEL ioctls for adding, changing and deleting ipip tunnels. Allow the SIOCADDTUNNEL, SIOCCHGTUNNEL and SIOCDELTUNNEL ioctls for adding, changing and deleting ipsec virtual tunnel interfaces. Allow setting the MRT_INIT, MRT_DONE, MRT_ADD_VIF, MRT_DEL_VIF, MRT_ADD_MFC, MRT_DEL_MFC, MRT_ASSERT, MRT_PIM, MRT_TABLE socket options on multicast routing sockets. Allow setting and receiving IPOPT_CIPSO, IP_OPT_SEC, IP_OPT_SID and arbitrary ip options. Allow setting IP_SEC_POLICY/IP_XFRM_POLICY ipv4 socket option. Allow setting the IP_TRANSPARENT ipv4 socket option. Allow setting the TCP_REPAIR socket option. Allow setting the TCP_CONGESTION socket option. Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-11-15net: Remove code duplication between offload structuresVlad Yasevich1-18/+24
Move the offload callbacks into its own structure. Signed-off-by: Vlad Yasevich <vyasevic@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-11-15ipv4: Pull GSO registration out of inet_init()Vlad Yasevich1-14/+21
Since GSO/GRO support is now separated, make IPv4 GSO a stand-alone init call and not part of inet_init(). Signed-off-by: Vlad Yasevich <vyasevic@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-11-15ipv4: Switch to using the new offload infrastructure.Vlad Yasevich1-14/+16
Switch IPv4 code base to using the new GRO/GSO calls and data. Signed-off-by: Vlad Yasevich <vyasevic@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-11-15net: Add net protocol offload registration infrustructureVlad Yasevich1-0/+12
Create a new data structure for IPv4 protocols that holds GRO/GSO callbacks and a new array to track the protocols that register GRO/GSO. Signed-off-by: Vlad Yasevich <vyasevic@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-11-15net: Switch to using the new packet offload infrustructureVlad Yasevich1-0/+5
Convert to using the new GSO/GRO registration mechanism and new packet offload structure. Signed-off-by: Vlad Yasevich <vyasevic@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-09-20ipv4: Don't add TCP-code in inet_sock_destructChristoph Paasch1-2/+0
Signed-off-by: Christoph Paasch <christoph.paasch@uclouvain.be> Acked-by: H.K. Jerry Chu <hkchu@google.com> Acked-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-09-06tcp: fix TFO regressionEric Dumazet1-5/+2
Fengguang Wu reported various panics and bisected to commit 8336886f786fdac (tcp: TCP Fast Open Server - support TFO listeners) Fix this by making sure socket is a TCP socket before accessing TFO data structures. [ 233.046014] kfree_debugcheck: out of range ptr ea6000000bb8h. [ 233.047399] ------------[ cut here ]------------ [ 233.048393] kernel BUG at /c/kernel-tests/src/stable/mm/slab.c:3074! [ 233.048393] invalid opcode: 0000 [#1] SMP DEBUG_PAGEALLOC [ 233.048393] Modules linked in: [ 233.048393] CPU 0 [ 233.048393] Pid: 3929, comm: trinity-watchdo Not tainted 3.6.0-rc3+ #4192 Bochs Bochs [ 233.048393] RIP: 0010:[<ffffffff81169653>] [<ffffffff81169653>] kfree_debugcheck+0x27/0x2d [ 233.048393] RSP: 0018:ffff88000facbca8 EFLAGS: 00010092 [ 233.048393] RAX: 0000000000000031 RBX: 0000ea6000000bb8 RCX: 00000000a189a188 [ 233.048393] RDX: 000000000000a189 RSI: ffffffff8108ad32 RDI: ffffffff810d30f9 [ 233.048393] RBP: ffff88000facbcb8 R08: 0000000000000002 R09: ffffffff843846f0 [ 233.048393] R10: ffffffff810ae37c R11: 0000000000000908 R12: 0000000000000202 [ 233.048393] R13: ffffffff823dbd5a R14: ffff88000ec5bea8 R15: ffffffff8363c780 [ 233.048393] FS: 00007faa6899c700(0000) GS:ffff88001f200000(0000) knlGS:0000000000000000 [ 233.048393] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [ 233.048393] CR2: 00007faa6841019c CR3: 0000000012c82000 CR4: 00000000000006f0 [ 233.048393] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 233.048393] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [ 233.048393] Process trinity-watchdo (pid: 3929, threadinfo ffff88000faca000, task ffff88000faec600) [ 233.048393] Stack: [ 233.048393] 0000000000000000 0000ea6000000bb8 ffff88000facbce8 ffffffff8116ad81 [ 233.048393] ffff88000ff588a0 ffff88000ff58850 ffff88000ff588a0 0000000000000000 [ 233.048393] ffff88000facbd08 ffffffff823dbd5a ffffffff823dbcb0 ffff88000ff58850 [ 233.048393] Call Trace: [ 233.048393] [<ffffffff8116ad81>] kfree+0x5f/0xca [ 233.048393] [<ffffffff823dbd5a>] inet_sock_destruct+0xaa/0x13c [ 233.048393] [<ffffffff823dbcb0>] ? inet_sk_rebuild_header +0x319/0x319 [ 233.048393] [<ffffffff8231c307>] __sk_free+0x21/0x14b [ 233.048393] [<ffffffff8231c4bd>] sk_free+0x26/0x2a [ 233.048393] [<ffffffff825372db>] sctp_close+0x215/0x224 [ 233.048393] [<ffffffff810d6835>] ? lock_release+0x16f/0x1b9 [ 233.048393] [<ffffffff823daf12>] inet_release+0x7e/0x85 [ 233.048393] [<ffffffff82317d15>] sock_release+0x1f/0x77 [ 233.048393] [<ffffffff82317d94>] sock_close+0x27/0x2b [ 233.048393] [<ffffffff81173bbe>] __fput+0x101/0x20a [ 233.048393] [<ffffffff81173cd5>] ____fput+0xe/0x10 [ 233.048393] [<ffffffff810a3794>] task_work_run+0x5d/0x75 [ 233.048393] [<ffffffff8108da70>] do_exit+0x290/0x7f5 [ 233.048393] [<ffffffff82707415>] ? retint_swapgs+0x13/0x1b [ 233.048393] [<ffffffff8108e23f>] do_group_exit+0x7b/0xba [ 233.048393] [<ffffffff8108e295>] sys_exit_group+0x17/0x17 [ 233.048393] [<ffffffff8270de10>] tracesys+0xdd/0xe2 [ 233.048393] Code: 59 01 5d c3 55 48 89 e5 53 41 50 0f 1f 44 00 00 48 89 fb e8 d4 b0 f0 ff 84 c0 75 11 48 89 de 48 c7 c7 fc fa f7 82 e8 0d 0f 57 01 <0f> 0b 5f 5b 5d c3 55 48 89 e5 0f 1f 44 00 00 48 63 87 d8 00 00 [ 233.048393] RIP [<ffffffff81169653>] kfree_debugcheck+0x27/0x2d [ 233.048393] RSP <ffff88000facbca8> Reported-by: Fengguang Wu <wfg@linux.intel.com> Tested-by: Fengguang Wu <wfg@linux.intel.com> Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: "H.K. Jerry Chu" <hkchu@google.com> Acked-by: Neal Cardwell <ncardwell@google.com> Acked-by: H.K. Jerry Chu <hkchu@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-08-31tcp: TCP Fast Open Server - support TFO listenersJerry Chu1-1/+27
This patch builds on top of the previous patch to add the support for TFO listeners. This includes - 1. allocating, properly initializing, and managing the per listener fastopen_queue structure when TFO is enabled 2. changes to the inet_csk_accept code to support TFO. E.g., the request_sock can no longer be freed upon accept(), not until 3WHS finishes 3. allowing a TCP_SYN_RECV socket to properly poll() and sendmsg() if it's a TFO socket 4. properly closing a TFO listener, and a TFO socket before 3WHS finishes 5. supporting TCP_FASTOPEN socket option 6. modifying tcp_check_req() to use to check a TFO socket as well as request_sock 7. supporting TCP's TFO cookie option 8. adding a new SYN-ACK retransmit handler to use the timer directly off the TFO socket rather than the listener socket. Note that TFO server side will not retransmit anything other than SYN-ACK until the 3WHS is completed. The patch also contains an important function "reqsk_fastopen_remove()" to manage the somewhat complex relation between a listener, its request_sock, and the corresponding child socket. See the comment above the function for the detail. Signed-off-by: H.K. Jerry Chu <hkchu@google.com> Cc: Yuchung Cheng <ycheng@google.com> Cc: Neal Cardwell <ncardwell@google.com> Cc: Eric Dumazet <edumazet@google.com> Cc: Tom Herbert <therbert@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-08-06net: tcp: GRO should be ECN friendlyEric Dumazet1-2/+2
While doing TCP ECN tests, I discovered GRO was reordering packets if it receives one packet with CE set, while previous packets in same NAPI run have ECT(0) for the same flow : 09:25:25.857620 IP (tos 0x2,ECT(0), ttl 64, id 27893, offset 0, flags [DF], proto TCP (6), length 4396) 172.30.42.19.54550 > 172.30.42.13.44139: Flags [.], seq 233801:238145, ack 1, win 115, options [nop,nop,TS val 3397779 ecr 1990627], length 4344 09:25:25.857626 IP (tos 0x3,CE, ttl 64, id 27892, offset 0, flags [DF], proto TCP (6), length 1500) 172.30.42.19.54550 > 172.30.42.13.44139: Flags [.], seq 232353:233801, ack 1, win 115, options [nop,nop,TS val 3397779 ecr 1990627], length 1448 09:25:25.857638 IP (tos 0x0, ttl 64, id 34581, offset 0, flags [DF], proto TCP (6), length 64) 172.30.42.13.44139 > 172.30.42.19.54550: Flags [.], cksum 0xac8f (incorrect -> 0xca69), ack 232353, win 1271, options [nop,nop,TS val 1990627 ecr 3397779,nop,nop,sack 1 {233801:238145}], length 0 We have two problems here : 1) GRO reorders packets If NIC gave packet1, then packet2, which happen to be from "different flows" GRO feeds stack with packet2, then packet1. I have yet to understand how to solve this problem. 2) GRO is not ECN friendly Delivering packets out of order makes TCP stack not as fast as it could be. In this patch I suggest we make the tos test not part of the 'same_flow' determination, but part of the 'should flush' logic Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Herbert Xu <herbert@gondor.apana.org.au> Acked-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-07-19net-tcp: Fast Open client - sendmsg(MSG_FASTOPEN)Yuchung Cheng1-5/+14
sendmsg() (or sendto()) with MSG_FASTOPEN is a combo of connect(2) and write(2). The application should replace connect() with it to send data in the opening SYN packet. For blocking socket, sendmsg() blocks until all the data are buffered locally and the handshake is completed like connect() call. It returns similar errno like connect() if the TCP handshake fails. For non-blocking socket, it returns the number of bytes queued (and transmitted in the SYN-data packet) if cookie is available. If cookie is not available, it transmits a data-less SYN packet with Fast Open cookie request option and returns -EINPROGRESS like connect(). Using MSG_FASTOPEN on connecting or connected socket will result in simlar errno like repeating connect() calls. Therefore the application should only use this flag on new sockets. The buffer size of sendmsg() is independent of the MSS of the connection. Signed-off-by: Yuchung Cheng <ycheng@google.com> Acked-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-07-19net-tcp: Fast Open client - sending SYN-dataYuchung Cheng1-2/+8
This patch implements sending SYN-data in tcp_connect(). The data is from tcp_sendmsg() with flag MSG_FASTOPEN (implemented in a later patch). The length of the cookie in tcp_fastopen_req, init'd to 0, controls the type of the SYN. If the cookie is not cached (len==0), the host sends data-less SYN with Fast Open cookie request option to solicit a cookie from the remote. If cookie is not available (len > 0), the host sends a SYN-data with Fast Open cookie option. If cookie length is negative, the SYN will not include any Fast Open option (for fall back operations). To deal with middleboxes that may drop SYN with data or experimental TCP option, the SYN-data is only sent once. SYN retransmits do not include data or Fast Open options. The connection will fall back to regular TCP handshake. Signed-off-by: Yuchung Cheng <ycheng@google.com> Acked-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-06-19ipv4: Early TCP socket demux.David S. Miller1-8/+10
Input packet processing for local sockets involves two major demuxes. One for the route and one for the socket. But we can optimize this down to one demux for certain kinds of local sockets. Currently we only do this for established TCP sockets, but it could at least in theory be expanded to other kinds of connections. If a TCP socket is established then it's identity is fully specified. This means that whatever input route was used during the three-way handshake must work equally well for the rest of the connection since the keys will not change. Once we move to established state, we cache the receive packet's input route to use later. Like the existing cached route in sk->sk_dst_cache used for output packets, we have to check for route invalidations using dst->obsolete and dst->ops->check(). Early demux occurs outside of a socket locked section, so when a route invalidation occurs we defer the fixup of sk->sk_rx_dst until we are actually inside of established state packet processing and thus have the socket locked. Signed-off-by: David S. Miller <davem@davemloft.net>
2012-06-19inet: Sanitize inet{,6} protocol demux.David S. Miller1-14/+12
Don't pretend that inet_protos[] and inet6_protos[] are hashes, thay are just a straight arrays. Remove all unnecessary hash masking. Document MAX_INET_PROTOS. Use RAW_HTABLE_SIZE when appropriate. Reported-by: Ben Hutchings <bhutchings@solarflare.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-06-04net: Remove casts to same typeJoe Perches1-1/+1
Adding casts of objects to the same type is unnecessary and confusing for a human reader. For example, this cast: int y; int *p = (int *)&y; I used the coccinelle script below to find and remove these unnecessary casts. I manually removed the conversions this script produces of casts with __force and __user. @@ type T; T *p; @@ - (T *)p + p Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-04-21sock: Introduce named constants for sk_reusePavel Emelyanov1-1/+1
Name them in a "backward compatible" manner, i.e. reuse or not are still 1 and 0 respectively. The reuse value of 2 means that the socket with it will forcibly reuse everyone else's port. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-04-15ipv4: fix checkpatch errorsDaniel Baluta1-1/+1
Fix checkpatch errors of the following type: * ERROR: "foo * bar" should be "foo *bar" * ERROR: "(foo*)" should be "(foo *)" Signed-off-by: Daniel Baluta <dbaluta@ixiacom.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-03-28Remove all #inclusions of asm/system.hDavid Howells1-1/+0
Remove all #inclusions of asm/system.h preparatory to splitting and killing it. Performed with the following command: perl -p -i -e 's!^#\s*include\s*<asm/system[.]h>.*\n!!' `grep -Irl '^#\s*include\s*<asm/system[.]h>' *` Signed-off-by: David Howells <dhowells@redhat.com>
2012-03-12net: ipv4: Standardize prefixes for message loggingJoe Perches1-0/+2
Add #define pr_fmt(fmt) as appropriate. Add "IPv4: ", "TCP: ", and "IPsec: " to appropriate files. Standardize on "UDPLite: " for appropriate uses. Some prefixes were previously "UDPLITE: " and "UDP-Lite: ". Add KBUILD_MODNAME ": " to icmp and gre. Remove embedded prefixes as appropriate. Add missing "\n" to pr_info in gre.c. Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-03-11net: Convert printks to pr_<level>Joe Perches1-14/+11
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 <foo>_close are now prefixed with <foo>_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 <joe@perches.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-02-13net: implement IP_RECVTOS for IP_PKTOPTIONSJiri Benc1-0/+1
Currently, it is not easily possible to get TOS/DSCP value of packets from an incoming TCP stream. The mechanism is there, IP_PKTOPTIONS getsockopt with IP_RECVTOS set, the same way as incoming TTL can be queried. This is not actually implemented for TOS, though. This patch adds this functionality, both for IPv4 (IP_PKTOPTIONS) and IPv6 (IPV6_2292PKTOPTIONS). For IPv4, like in the IP_RECVTTL case, the value of the TOS field is stored from the other party's ACK. This is needed for proxies which require DSCP transparency. One such example is at http://zph.bratcheda.org/. Signed-off-by: Jiri Benc <jbenc@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2011-12-12per-netns ipv4 sysctl_tcp_memGlauber Costa1-0/+2
This patch allows each namespace to independently set up its levels for tcp memory pressure thresholds. This patch alone does not buy much: we need to make this values per group of process somehow. This is achieved in the patches that follows in this patchset. Signed-off-by: Glauber Costa <glommer@parallels.com> Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> CC: David S. Miller <davem@davemloft.net> CC: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2011-11-16net: introduce and use netdev_features_t for device features setsMichał Mirosław1-1/+2
v2: add couple missing conversions in drivers split unexporting netdev_fix_features() implemented %pNF convert sock::sk_route_(no?)caps Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl> Signed-off-by: David S. Miller <davem@davemloft.net>
2011-11-09ipv4: reduce percpu needs for icmpmsg mibsEric Dumazet1-4/+4
Reading /proc/net/snmp on a machine with a lot of cpus is very expensive (can be ~88000 us). This is because ICMPMSG MIB uses 4096 bytes per cpu, and folding values for all possible cpus can read 16 Mbytes of memory. ICMP messages are not considered as fast path on a typical server, and eventually few cpus handle them anyway. We can afford an atomic operation instead of using percpu data. This saves 4096 bytes per cpu and per network namespace. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2011-10-19ipv4: compat_ioctl is local to af_inet.c, make it staticGerrit Renker1-1/+1
ipv4: compat_ioctl is local to af_inet.c, make it static Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Signed-off-by: David S. Miller <davem@davemloft.net>
2011-08-30net: ipv4: relax AF_INET check in bind()Eric Dumazet1-1/+6
commit d0733d2e29b65 (Check for mistakenly passed in non-IPv4 address) added regression on legacy apps that use bind() with AF_UNSPEC family. Relax the check, but make sure the bind() is done on INADDR_ANY addresses, as AF_UNSPEC has probably no sane meaning for other addresses. Bugzilla reference : https://bugzilla.kernel.org/show_bug.cgi?id=42012 Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Reported-and-bisected-by: Rene Meier <r_meier@freenet.de> CC: Marcus Meissner <meissner@suse.de> Signed-off-by: David S. Miller <davem@davemloft.net>
2011-07-05Merge branch 'master' of ↵David S. Miller1-1/+3
master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
2011-07-04net: bind() fix error return on wrong address familyMarcus Meissner1-1/+3
Hi, Reinhard Max also pointed out that the error should EAFNOSUPPORT according to POSIX. The Linux manpages have it as EINVAL, some other OSes (Minix, HPUX, perhaps BSD) use EAFNOSUPPORT. Windows uses WSAEFAULT according to MSDN. Other protocols error values in their af bind() methods in current mainline git as far as a brief look shows: EAFNOSUPPORT: atm, appletalk, l2tp, llc, phonet, rxrpc EINVAL: ax25, bluetooth, decnet, econet, ieee802154, iucv, netlink, netrom, packet, rds, rose, unix, x25, No check?: can/raw, ipv6/raw, irda, l2tp/l2tp_ip Ciao, Marcus Signed-off-by: Marcus Meissner <meissner@suse.de> Cc: Reinhard Max <max@suse.de> Signed-off-by: David S. Miller <davem@davemloft.net>
2011-06-20Merge branch 'master' of ↵David S. Miller1-0/+1
master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 Conflicts: drivers/net/wireless/iwlwifi/iwl-agn-rxon.c drivers/net/wireless/rtlwifi/pci.c net/netfilter/ipvs/ip_vs_core.c
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