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* act_mirred: Fix bogus header when redirecting from VLANHerbert Xu2015-04-171-1/+1
| | | | | | | | | | | | | | | | When you redirect a VLAN device to any device, you end up with crap in af_packet on the xmit path because hard_header_len is not equal to skb->mac_len. So the redirected packet contains four extra bytes at the start which then gets interpreted as part of the MAC address. This patch fixes this by only pushing skb->mac_len. We also need to fix ifb because it tries to undo the pushing done by act_mirred. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Acked-by: Alexei Starovoitov <ast@plumgrid.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* bpf: fix bpf helpers to use skb->mac_header relative offsetsAlexei Starovoitov2015-04-162-0/+6
| | | | | | | | | | | | | | | | | | | | | | | | | | | | For the short-term solution, lets fix bpf helper functions to use skb->mac_header relative offsets instead of skb->data in order to get the same eBPF programs with cls_bpf and act_bpf work on ingress and egress qdisc path. We need to ensure that mac_header is set before calling into programs. This is effectively the first option from below referenced discussion. More long term solution for LD_ABS|LD_IND instructions will be more intrusive but also more beneficial than this, and implemented later as it's too risky at this point in time. I.e., we plan to look into the option of moving skb_pull() out of eth_type_trans() and into netif_receive_skb() as has been suggested as second option. Meanwhile, this solution ensures ingress can be used with eBPF, too, and that we won't run into ABI troubles later. For dealing with negative offsets inside eBPF helper functions, we've implemented bpf_skb_clone_unwritable() to test for unwriteable headers. Reference: http://thread.gmane.org/gmane.linux.network/359129/focus=359694 Fixes: 608cd71a9c7c ("tc: bpf: generalize pedit action") Fixes: 91bc4822c3d6 ("tc: bpf: add checksum helpers") Signed-off-by: Alexei Starovoitov <ast@plumgrid.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by: David S. Miller <davem@davemloft.net>
* Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netDavid S. Miller2015-04-141-1/+2
|\ | | | | | | | | | | | | The dwmac-socfpga.c conflict was a case of a bug fix overlapping changes in net-next to handle an error pointer differently. Signed-off-by: David S. Miller <davem@davemloft.net>
| * netem: Fixes byte backlog accounting for the first of two chained netem ↵Beshay, Joseph2015-04-071-1/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | instances Fixes byte backlog accounting for the first of two chained netem instances. Bytes backlog reported now corresponds to the number of queued packets. When two netem instances are chained, for instance to apply rate and queue limitation followed by packet delay, the number of backlogged bytes reported by the first netem instance is wrong. It reports the sum of bytes in the queues of the first and second netem. The first netem reports the correct number of backlogged packets but not bytes. This is shown in the example below. Consider a chain of two netem schedulers created using the following commands: $ tc -s qdisc replace dev veth2 root handle 1:0 netem rate 10000kbit limit 100 $ tc -s qdisc add dev veth2 parent 1:0 handle 2: netem delay 50ms Start an iperf session to send packets out on the specified interface and monitor the backlog using tc: $ tc -s qdisc show dev veth2 Output using unpatched netem: qdisc netem 1: root refcnt 2 limit 100 rate 10000Kbit Sent 98422639 bytes 65434 pkt (dropped 123, overlimits 0 requeues 0) backlog 172694b 73p requeues 0 qdisc netem 2: parent 1: limit 1000 delay 50.0ms Sent 98422639 bytes 65434 pkt (dropped 0, overlimits 0 requeues 0) backlog 63588b 42p requeues 0 The interface used to produce this output has an MTU of 1500. The output for backlogged bytes behind netem 1 is 172694b. This value is not correct. Consider the total number of sent bytes and packets. By dividing the number of sent bytes by the number of sent packets, we get an average packet size of ~=1504. If we divide the number of backlogged bytes by packets, we get ~=2365. This is due to the first netem incorrectly counting the 63588b which are in netem 2's queue as being in its own queue. To verify this is the case, we subtract them from the reported value and divide by the number of packets as follows: 172694 - 63588 = 109106 bytes actualled backlogged in netem 1 109106 / 73 packets ~= 1494 bytes (which matches our MTU) The root cause is that the byte accounting is not done at the same time with packet accounting. The solution is to update the backlog value every time the packet queue is updated. Signed-off-by: Joseph D Beshay <joseph.beshay@utdallas.edu> Acked-by: Hagen Paul Pfeifer <hagen@jauu.net> Signed-off-by: David S. Miller <davem@davemloft.net>
* | net: use jump label patching for ingress qdisc in __netif_receive_skb_coreDaniel Borkmann2015-04-131-0/+9
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Even if we make use of classifier and actions from the egress path, we're going into handle_ing() executing additional code on a per-packet cost for ingress qdisc, just to realize that nothing is attached on ingress. Instead, this can just be blinded out as a no-op entirely with the use of a static key. On input fast-path, we already make use of static keys in various places, e.g. skb time stamping, in RPS, etc. It makes sense to not waste time when we're assured that no ingress qdisc is attached anywhere. Enabling/disabling of that code path is being done via two helpers, namely net_{inc,dec}_ingress_queue(), that are being invoked under RTNL mutex when a ingress qdisc is being either initialized or destructed. Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Alexei Starovoitov <ast@plumgrid.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | pkt_sched: fq: correct spelling of locallySimon Horman2015-04-011-2/+2
| | | | | | | | | | | | | | | | | | Correct spelling of locally. Also remove extra space before tab character in struct fq_flow. Signed-off-by: Simon Horman <simon.horman@netronome.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | act_bpf: add initial eBPF support for actionsDaniel Borkmann2015-03-201-82/+213
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This work extends the "classic" BPF programmable tc action by extending its scope also to native eBPF code! Together with commit e2e9b6541dd4 ("cls_bpf: add initial eBPF support for programmable classifiers") this adds the facility to implement fully flexible classifier and actions for tc that can be implemented in a C subset in user space, "safely" loaded into the kernel, and being run in native speed when JITed. Also, since eBPF maps can be shared between eBPF programs, it offers the possibility that cls_bpf and act_bpf can share data 1) between themselves and 2) between user space applications. That means that, f.e. customized runtime statistics can be collected in user space, but also more importantly classifier and action behaviour could be altered based on map input from the user space application. For the remaining details on the workflow and integration, see the cls_bpf commit e2e9b6541dd4. Preliminary iproute2 part can be found under [1]. [1] http://git.breakpoint.cc/cgit/dborkman/iproute2.git/log/?h=ebpf-act Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Cc: Jamal Hadi Salim <jhs@mojatatu.com> Cc: Jiri Pirko <jiri@resnulli.us> Acked-by: Jiri Pirko <jiri@resnulli.us> Acked-by: Alexei Starovoitov <ast@plumgrid.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netDavid S. Miller2015-03-202-9/+32
|\| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Conflicts: drivers/net/ethernet/emulex/benet/be_main.c net/core/sysctl_net_core.c net/ipv4/inet_diag.c The be_main.c conflict resolution was really tricky. The conflict hunks generated by GIT were very unhelpful, to say the least. It split functions in half and moved them around, when the real actual conflict only existed solely inside of one function, that being be_map_pci_bars(). So instead, to resolve this, I checked out be_main.c from the top of net-next, then I applied the be_main.c changes from 'net' since the last time I merged. And this worked beautifully. The inet_diag.c and sysctl_net_core.c conflicts were simple overlapping changes, and were easily to resolve. Signed-off-by: David S. Miller <davem@davemloft.net>
| * act_bpf: allow non-default TC_ACT opcodes as BPF exec outcomeDaniel Borkmann2015-03-171-8/+28
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Revisiting commit d23b8ad8ab23 ("tc: add BPF based action") with regards to eBPF support, I was thinking that it might be better to improve return semantics from a BPF program invoked through BPF_PROG_RUN(). Currently, in case filter_res is 0, we overwrite the default action opcode with TC_ACT_SHOT. A default action opcode configured through tc's m_bpf can be: TC_ACT_RECLASSIFY, TC_ACT_PIPE, TC_ACT_SHOT, TC_ACT_UNSPEC, TC_ACT_OK. In cls_bpf, we have the possibility to overwrite the default class associated with the classifier in case filter_res is _not_ 0xffffffff (-1). That allows us to fold multiple [e]BPF programs into a single one, where they would otherwise need to be defined as a separate classifier with its own classid, needlessly redoing parsing work, etc. Similarly, we could do better in act_bpf: Since above TC_ACT* opcodes are exported to UAPI anyway, we reuse them for return-code-to-tc-opcode mapping, where we would allow above possibilities. Thus, like in cls_bpf, a filter_res of 0xffffffff (-1) means that the configured _default_ action is used. Any unkown return code from the BPF program would fail in tcf_bpf() with TC_ACT_UNSPEC. Should we one day want to make use of TC_ACT_STOLEN or TC_ACT_QUEUED, which both have the same semantics, we have the option to either use that as a default action (filter_res of 0xffffffff) or non-default BPF return code. All that will allow us to transparently use tcf_bpf() for both BPF flavours. Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Cc: Jiri Pirko <jiri@resnulli.us> Cc: Alexei Starovoitov <ast@plumgrid.com> Cc: Jamal Hadi Salim <jhs@mojatatu.com> Acked-by: Jiri Pirko <jiri@resnulli.us> Signed-off-by: David S. Miller <davem@davemloft.net>
| * net_sched: fix struct tc_u_hnode layout in u32WANG Cong2015-03-091-1/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | We dynamically allocate divisor+1 entries for ->ht[] in tc_u_hnode: ht = kzalloc(sizeof(*ht) + divisor*sizeof(void *), GFP_KERNEL); So ->ht is supposed to be the last field of this struct, however this is broken, since an rcu head is appended after it. Fixes: 1ce87720d456 ("net: sched: make cls_u32 lockless") Cc: Jamal Hadi Salim <jhs@mojatatu.com> Cc: John Fastabend <john.fastabend@gmail.com> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Acked-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | cls_bpf: do eBPF invocation under non-bh RCU lock variant for mapsDaniel Borkmann2015-03-121-3/+6
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Currently, it is possible in cls_bpf to access eBPF maps only under rcu_read_lock_bh() variants: while on ingress side, that is, handle_ing(), the classifier would be called from __netif_receive_skb_core() under rcu_read_lock(); on egress side, however, it's rcu_read_lock_bh() via __dev_queue_xmit(). This rcu/rcu_bh mix doesn't work together with eBPF maps as they require soley to be called under rcu_read_lock(). eBPF maps could also be shared among various other eBPF programs (possibly even with other eBPF program types, f.e. tracing) and user space processes, so any context is assumed. Therefore, a possible fix for cls_bpf is to wrap/nest eBPF program invocation under non-bh RCU lock variant. Fixes: e2e9b6541dd4 ("cls_bpf: add initial eBPF support for programmable classifiers") Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Alexei Starovoitov <ast@plumgrid.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | net_sched: destroy proto tp when all filters are goneCong Wang2015-03-0911-21/+97
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Kernel automatically creates a tp for each (kind, protocol, priority) tuple, which has handle 0, when we add a new filter, but it still is left there after we remove our own, unless we don't specify the handle (literally means all the filters under the tuple). For example this one is left: # tc filter show dev eth0 filter parent 8001: protocol arp pref 49152 basic The user-space is hard to clean up these for kernel because filters like u32 are organized in a complex way. So kernel is responsible to remove it after all filters are gone. Each type of filter has its own way to store the filters, so each type has to provide its way to check if all filters are gone. Cc: Jamal Hadi Salim <jhs@mojatatu.com> Signed-off-by: Cong Wang <cwang@twopensource.com> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Acked-by: Jamal Hadi Salim<jhs@mojatatu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | net_sched: move tp->root allocation into fw_init()WANG Cong2015-03-051-10/+13
| | | | | | | | | | | | | | Cc: Jamal Hadi Salim <jhs@mojatatu.com> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Acked-by: Jamal Hadi Salim <jhs@mojatatu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | net_sched: move tp->root allocation into route4_init()WANG Cong2015-03-051-7/+7
| | | | | | | | | | | | | | Cc: Jamal Hadi Salim <jhs@mojatatu.com> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Acked-by: Jamal Hadi Salim <jhs@mojatatu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netDavid S. Miller2015-03-032-1/+2
|\| | | | | | | | | | | | | | | | | | | | | Conflicts: drivers/net/ethernet/rocker/rocker.c The rocker commit was two overlapping changes, one to rename the ->vport member to ->pport, and another making the bitmask expression use '1ULL' instead of plain '1'. Signed-off-by: David S. Miller <davem@davemloft.net>
| * Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netLinus Torvalds2015-03-031-0/+1
| |\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Pull networking fixes from David Miller: 1) If an IPVS tunnel is created with a mixed-family destination address, it cannot be removed. Fix from Alexey Andriyanov. 2) Fix module refcount underflow in netfilter's nft_compat, from Pablo Neira Ayuso. 3) Generic statistics infrastructure can reference variables sitting on a released function stack, therefore use dynamic allocation always. Fix from Ignacy Gawędzki. 4) skb_copy_bits() return value test is inverted in ip_check_defrag(). 5) Fix network namespace exit in openvswitch, we have to release all of the per-net vports. From Pravin B Shelar. 6) Fix signedness bug in CAIF's cfpkt_iterate(), from Dan Carpenter. 7) Fix rhashtable grow/shrink behavior, only expand during inserts and shrink during deletes. From Daniel Borkmann. 8) Netdevice names with semicolons should never be allowed, because they serve as a separator. From Matthew Thode. 9) Use {,__}set_current_state() where appropriate, from Fabian Frederick. 10) Revert byte queue limits support in r8169 driver, it's causing regressions we can't figure out. 11) tcp_should_expand_sndbuf() erroneously uses tp->packets_out to measure packets in flight, properly use tcp_packets_in_flight() instead. From Neal Cardwell. 12) Fix accidental removal of support for bluetooth in CSR based Intel wireless cards. From Marcel Holtmann. 13) We accidently added a behavioral change between native and compat tasks, wrt testing the MSG_CMSG_COMPAT bit. Just ignore it if the user happened to set it in a native binary as that was always the behavior we had. From Catalin Marinas. 14) Check genlmsg_unicast() return valud in hwsim netlink tx frame handling, from Bob Copeland. 15) Fix stale ->radar_required setting in mac80211 that can prevent starting new scans, from Eliad Peller. 16) Fix memory leak in nl80211 monitor, from Johannes Berg. 17) Fix race in TX index handling in xen-netback, from David Vrabel. 18) Don't enable interrupts in amx-xgbe driver until all software et al. state is ready for the interrupt handler to run. From Thomas Lendacky. 19) Add missing netlink_ns_capable() checks to rtnl_newlink(), from Eric W Biederman. 20) The amount of header space needed in macvtap was not calculated properly, fix it otherwise we splat past the beginning of the packet. From Eric Dumazet. 21) Fix bcmgenet TCP TX perf regression, from Jaedon Shin. 22) Don't raw initialize or mod timers, use setup_timer() and mod_timer() instead. From Vaishali Thakkar. 23) Fix software maintained statistics in bcmgenet and systemport drivers, from Florian Fainelli. 24) DMA descriptor updates in sh_eth need proper memory barriers, from Ben Hutchings. 25) Don't do UDP Fragmentation Offload on RAW sockets, from Michal Kubecek. 26) Openvswitch's non-masked set actions aren't constructed properly into netlink messages, fix from Joe Stringer. * git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (116 commits) openvswitch: Fix serialization of non-masked set actions. gianfar: Reduce logging noise seen due to phy polling if link is down ibmveth: Add function to enable live MAC address changes net: bridge: add compile-time assert for cb struct size udp: only allow UFO for packets from SOCK_DGRAM sockets sh_eth: Really fix padding of short frames on TX Revert "sh_eth: Enable Rx descriptor word 0 shift for r8a7790" sh_eth: Fix RX recovery on R-Car in case of RX ring underrun sh_eth: Ensure proper ordering of descriptor active bit write/read net/mlx4_en: Disbale GRO for incoming loopback/selftest packets net/mlx4_core: Fix wrong mask and error flow for the update-qp command net: systemport: fix software maintained statistics net: bcmgenet: fix software maintained statistics rxrpc: don't multiply with HZ twice rxrpc: terminate retrans loop when sending of skb fails net/hsr: Fix NULL pointer dereference and refcnt bugs when deleting a HSR interface. net: pasemi: Use setup_timer and mod_timer net: stmmac: Use setup_timer and mod_timer net: 8390: axnet_cs: Use setup_timer and mod_timer net: 8390: pcnet_cs: Use setup_timer and mod_timer ...
| | * ematch: Fix auto-loading of ematch modules.Ignacy Gawędzki2015-02-201-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | In tcf_em_validate(), after calling request_module() to load the kind-specific module, set em->ops to NULL before returning -EAGAIN, so that module_put() is not called again by tcf_em_tree_destroy(). Signed-off-by: Ignacy Gawędzki <ignacy.gawedzki@green-communications.fr> Acked-by: Cong Wang <cwang@twopensource.com> Signed-off-by: David S. Miller <davem@davemloft.net>
| * | Merge branch 'kconfig' of ↵Linus Torvalds2015-02-191-1/+1
| |\ \ | | |/ | |/| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild Pull kconfig updates from Michal Marek: "Yann E Morin was supposed to take over kconfig maintainership, but this hasn't happened. So I'm sending a few kconfig patches that I collected: - Fix for missing va_end in kconfig - merge_config.sh displays used if given too few arguments - s/boolean/bool/ in Kconfig files for consistency, with the plan to only support bool in the future" * 'kconfig' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild: kconfig: use va_end to match corresponding va_start merge_config.sh: Display usage if given too few arguments kconfig: use bool instead of boolean for type definition attributes
| | * kconfig: use bool instead of boolean for type definition attributesChristoph Jaeger2015-01-071-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Support for keyword 'boolean' will be dropped later on. No functional change. Reference: http://lkml.kernel.org/r/cover.1418003065.git.cj@linux.com Signed-off-by: Christoph Jaeger <cj@linux.com> Signed-off-by: Michal Marek <mmarek@suse.cz>
* | | cls_bpf: add initial eBPF support for programmable classifiersDaniel Borkmann2015-03-011-52/+154
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This work extends the "classic" BPF programmable tc classifier by extending its scope also to native eBPF code! This allows for user space to implement own custom, 'safe' C like classifiers (or whatever other frontend language LLVM et al may provide in future), that can then be compiled with the LLVM eBPF backend to an eBPF elf file. The result of this can be loaded into the kernel via iproute2's tc. In the kernel, they can be JITed on major archs and thus run in native performance. Simple, minimal toy example to demonstrate the workflow: #include <linux/ip.h> #include <linux/if_ether.h> #include <linux/bpf.h> #include "tc_bpf_api.h" __section("classify") int cls_main(struct sk_buff *skb) { return (0x800 << 16) | load_byte(skb, ETH_HLEN + __builtin_offsetof(struct iphdr, tos)); } char __license[] __section("license") = "GPL"; The classifier can then be compiled into eBPF opcodes and loaded via tc, for example: clang -O2 -emit-llvm -c cls.c -o - | llc -march=bpf -filetype=obj -o cls.o tc filter add dev em1 parent 1: bpf cls.o [...] As it has been demonstrated, the scope can even reach up to a fully fledged flow dissector (similarly as in samples/bpf/sockex2_kern.c). For tc, maps are allowed to be used, but from kernel context only, in other words, eBPF code can keep state across filter invocations. In future, we perhaps may reattach from a different application to those maps e.g., to read out collected statistics/state. Similarly as in socket filters, we may extend functionality for eBPF classifiers over time depending on the use cases. For that purpose, cls_bpf programs are using BPF_PROG_TYPE_SCHED_CLS program type, so we can allow additional functions/accessors (e.g. an ABI compatible offset translation to skb fields/metadata). For an initial cls_bpf support, we allow the same set of helper functions as eBPF socket filters, but we could diverge at some point in time w/o problem. I was wondering whether cls_bpf and act_bpf could share C programs, I can imagine that at some point, we introduce i) further common handlers for both (or even beyond their scope), and/or if truly needed ii) some restricted function space for each of them. Both can be abstracted easily through struct bpf_verifier_ops in future. The context of cls_bpf versus act_bpf is slightly different though: a cls_bpf program will return a specific classid whereas act_bpf a drop/non-drop return code, latter may also in future mangle skbs. That said, we can surely have a "classify" and "action" section in a single object file, or considered mentioned constraint add a possibility of a shared section. The workflow for getting native eBPF running from tc [1] is as follows: for f_bpf, I've added a slightly modified ELF parser code from Alexei's kernel sample, which reads out the LLVM compiled object, sets up maps (and dynamically fixes up map fds) if any, and loads the eBPF instructions all centrally through the bpf syscall. The resulting fd from the loaded program itself is being passed down to cls_bpf, which looks up struct bpf_prog from the fd store, and holds reference, so that it stays available also after tc program lifetime. On tc filter destruction, it will then drop its reference. Moreover, I've also added the optional possibility to annotate an eBPF filter with a name (e.g. path to object file, or something else if preferred) so that when tc dumps currently installed filters, some more context can be given to an admin for a given instance (as opposed to just the file descriptor number). Last but not least, bpf_prog_get() and bpf_prog_put() needed to be exported, so that eBPF can be used from cls_bpf built as a module. Thanks to 60a3b2253c41 ("net: bpf: make eBPF interpreter images read-only") I think this is of no concern since anything wanting to alter eBPF opcode after verification stage would crash the kernel. [1] http://git.breakpoint.cc/cgit/dborkman/iproute2.git/log/?h=ebpf Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Cc: Jamal Hadi Salim <jhs@mojatatu.com> Cc: Jiri Pirko <jiri@resnulli.us> Acked-by: Alexei Starovoitov <ast@plumgrid.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | | net: Remove state argument from skb_find_text()Bojan Prtvar2015-02-221-2/+1
|/ / | | | | | | | | | | | | | | | | | | Although it is clear that textsearch state is intentionally passed to skb_find_text() as uninitialized argument, it was never used by the callers. Therefore, we can simplify skb_find_text() by making it local variable. Signed-off-by: Bojan Prtvar <prtvar.b@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netDavid S. Miller2015-02-052-5/+12
|\ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Conflicts: drivers/net/vxlan.c drivers/vhost/net.c include/linux/if_vlan.h net/core/dev.c The net/core/dev.c conflict was the overlap of one commit marking an existing function static whilst another was adding a new function. In the include/linux/if_vlan.h case, the type used for a local variable was changed in 'net', whereas the function got rewritten to fix a stacked vlan bug in 'net-next'. In drivers/vhost/net.c, Al Viro's iov_iter conversions in 'net-next' overlapped with an endainness fix for VHOST 1.0 in 'net'. In drivers/net/vxlan.c, vxlan_find_vni() added a 'flags' parameter in 'net-next' whereas in 'net' there was a bug fix to pass in the correct network namespace pointer in calls to this function. Signed-off-by: David S. Miller <davem@davemloft.net>
| * | cls_api.c: Fix dumping of non-existing actions' stats.Ignacy Gawędzki2015-02-041-3/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | In tcf_exts_dump_stats(), ensure that exts->actions is not empty before accessing the first element of that list and calling tcf_action_copy_stats() on it. This fixes some random segvs when adding filters of type "basic" with no particular action. This also fixes the dumping of those "no-action" filters, which more often than not made calls to tcf_action_copy_stats() fail and consequently netlink attributes added by the caller to be removed by a call to nla_nest_cancel(). Fixes: 33be62715991 ("net_sched: act: use standard struct list_head") Signed-off-by: Ignacy Gawędzki <ignacy.gawedzki@green-communications.fr> Acked-by: Cong Wang <cwang@twopensource.com> Signed-off-by: David S. Miller <davem@davemloft.net>
| * | pkt_sched: fq: avoid hang when quantum 0Kenneth Klette Jonassen2015-02-041-2/+8
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Configuring fq with quantum 0 hangs the system, presumably because of a non-interruptible infinite loop. Either way quantum 0 does not make sense. Reproduce with: sudo tc qdisc add dev lo root fq quantum 0 initial_quantum 0 ping 127.0.0.1 Signed-off-by: Kenneth Klette Jonassen <kennetkl@ifi.uio.no> Acked-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | | pkt_sched: fq: better control of DDOS trafficEric Dumazet2015-02-041-2/+17
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | FQ has a fast path for skb attached to a socket, as it does not have to compute a flow hash. But for other packets, FQ being non stochastic means that hosts exposed to random Internet traffic can allocate million of flows structure (104 bytes each) pretty easily. Not only host can OOM, but lookup in RB trees can take too much cpu and memory resources. This patch adds a new attribute, orphan_mask, that is adding possibility of having a stochastic hash for orphaned skb. Its default value is 1024 slots, to mimic SFQ behavior. Note: This does not apply to locally generated TCP traffic, and no locally generated traffic will share a flow structure with another perfect or stochastic flow. This patch also handles the specific case of SYNACK messages: They are attached to the listener socket, and therefore all map to a single hash bucket. If listener have set SO_MAX_PACING_RATE, hoping to have new accepted socket inherit this rate, SYNACK might be paced and even dropped. This is very similar to an internal patch Google have used more than one year. Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | | tcp: do not pace pure ack packetsEric Dumazet2015-02-041-2/+8
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | When we added pacing to TCP, we decided to let sch_fq take care of actual pacing. All TCP had to do was to compute sk->pacing_rate using simple formula: sk->pacing_rate = 2 * cwnd * mss / rtt It works well for senders (bulk flows), but not very well for receivers or even RPC : cwnd on the receiver can be less than 10, rtt can be around 100ms, so we can end up pacing ACK packets, slowing down the sender. Really, only the sender should pace, according to its own logic. Instead of adding a new bit in skb, or call yet another flow dissection, we tweak skb->truesize to a small value (2), and we instruct sch_fq to use new helper and not pace pure ack. Note this also helps TCP small queue, as ack packets present in qdisc/NIC do not prevent sending a data packet (RPC workload) This helps to reduce tx completion overhead, ack packets can use regular sock_wfree() instead of tcp_wfree() which is a bit more expensive. This has no impact in the case packets are sent to loopback interface, as we do not coalesce ack packets (were we would detect skb->truesize lie) In case netem (with a delay) is used, skb_orphan_partial() also sets skb->truesize to 1. This patch is a combination of two patches we used for about one year at Google. Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | | pkt_sched: fq: remove useless TIME_WAIT checkEric Dumazet2015-01-281-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | TIME_WAIT sockets are not owning any skb. ip_send_unicast_reply() and tcp_v6_send_response() both use regular sockets. We can safely remove a test in sch_fq and save one cache line miss, as sk_state is far away from sk_pacing_rate. Tested at Google for about one year. Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | | act_connmark: fix dependencies betterArnd Bergmann2015-01-281-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | NET_ACT_CONNMARK fails to build if NF_CONNTRACK_MARK is disabled, and d7924450e14ea4 ("act_connmark: Add missing dependency on NF_CONNTRACK_MARK") fixed that case, but missed the cased where NF_CONNTRACK is a loadable module. This adds the second dependency to ensure that NET_ACT_CONNMARK can only be built-in if NF_CONNTRACK is also part of the kernel rather than a loadable module. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: David S. Miller <davem@davemloft.net>
* | | Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netDavid S. Miller2015-01-271-2/+13
|\| | | | | | | | | | | | | | | | | | | | | | | | | | | | | Conflicts: arch/arm/boot/dts/imx6sx-sdb.dts net/sched/cls_bpf.c Two simple sets of overlapping changes. Signed-off-by: David S. Miller <davem@davemloft.net>
| * | net: cls_bpf: fix auto generation of per list handlesDaniel Borkmann2015-01-261-2/+8
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | When creating a bpf classifier in tc with priority collisions and invoking automatic unique handle assignment, cls_bpf_grab_new_handle() will return a wrong handle id which in fact is non-unique. Usually altering of specific filters is being addressed over major id, but in case of collisions we result in a filter chain, where handle ids address individual cls_bpf_progs inside the classifier. Issue is, in cls_bpf_grab_new_handle() we probe for head->hgen handle in cls_bpf_get() and in case we found a free handle, we're supposed to use exactly head->hgen. In case of insufficient numbers of handles, we bail out later as handle id 0 is not allowed. Fixes: 7d1d65cb84e1 ("net: sched: cls_bpf: add BPF-based classifier") Signed-off-by: Daniel Borkmann <dborkman@redhat.com> Acked-by: Jiri Pirko <jiri@resnulli.us> Acked-by: Alexei Starovoitov <ast@plumgrid.com> Signed-off-by: David S. Miller <davem@davemloft.net>
| * | net: cls_bpf: fix size mismatch on filter preparationDaniel Borkmann2015-01-261-0/+5
| |/ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | In cls_bpf_modify_existing(), we read out the number of filter blocks, do some sanity checks, allocate a block on that size, and copy over the BPF instruction blob from user space, then pass everything through the classic BPF checker prior to installation of the classifier. We should reject mismatches here, there are 2 scenarios: the number of filter blocks could be smaller than the provided instruction blob, so we do a partial copy of the BPF program, and thus the instructions will either be rejected from the verifier or a valid BPF program will be run; in the other case, we'll end up copying more than we're supposed to, and most likely the trailing garbage will be rejected by the verifier as well (i.e. we need to fit instruction pattern, ret {A,K} needs to be last instruction, load/stores must be correct, etc); in case not, we would leak memory when dumping back instruction patterns. The code should have only used nla_len() as Dave noted to avoid this from the beginning. Anyway, lets fix it by rejecting such load attempts. Fixes: 7d1d65cb84e1 ("net: sched: cls_bpf: add BPF-based classifier") Signed-off-by: Daniel Borkmann <dborkman@redhat.com> Acked-by: Jiri Pirko <jiri@resnulli.us> Signed-off-by: David S. Miller <davem@davemloft.net>
* | net: act_bpf: fix size mismatch on filter preparationDaniel Borkmann2015-01-261-0/+3
| | | | | | | | | | | | | | | | | | | | | | Similarly as in cls_bpf, also this code needs to reject mismatches. Reference: http://article.gmane.org/gmane.linux.network/347406 Fixes: d23b8ad8ab23 ("tc: add BPF based action") Signed-off-by: Daniel Borkmann <dborkman@redhat.com> Acked-by: Jiri Pirko <jiri@resnulli.us> Acked-by: Alexei Starovoitov <ast@plumgrid.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | net: cls_basic: return from walking on match in basic_getDaniel Borkmann2015-01-261-2/+5
| | | | | | | | | | | | | | | | | | | | | | | | As soon as we've found a matching handle in basic_get(), we can return it. There's no need to continue walking until the end of a filter chain, since they are unique anyway. Signed-off-by: Daniel Borkmann <dborkman@redhat.com> Acked-by: Jiri Pirko <jiri@resnulli.us> Cc: Thomas Graf <tgraf@suug.ch> Acked-by: Thomas Graf <tgraf@suug.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
* | act_connmark: Add missing dependency on NF_CONNTRACK_MARKThomas Graf2015-01-231-0/+1
| | | | | | | | | | | | | | | | | | | | | | Depending on NETFILTER is not sufficient to ensure the presence of the 'mark' field in nf_conn, also needs to depend on NF_CONNTRACK_MARK. Fixes: 22a5dc ("net: sched: Introduce connmark action") Cc: Felix Fietkau <nbd@openwrt.org> Cc: Jamal Hadi Salim <jhs@mojatatu.com> Signed-off-by: Thomas Graf <tgraf@suug.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
* | net: sched: Introduce connmark actionFelix Fietkau2015-01-193-0/+204
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This tc action allows you to retrieve the connection tracking mark This action has been used heavily by openwrt for a few years now. There are known limitations currently: doesn't work for initial packets, since we only query the ct table. Fine given use case is for returning packets no implicit defrag. frags should be rare so fix later.. won't work for more complex tasks, e.g. lookup of other extensions since we have no means to store results we still have a 2nd lookup later on via normal conntrack path. This shouldn't break anything though since skb->nfct isn't altered. V2: remove unnecessary braces (Jiri) change the action identifier to 14 (Jiri) Fix some stylistic issues caught by checkpatch V3: Move module params to bottom (Cong) Get rid of tcf_hashinfo_init and friends and conform to newer API (Cong) Acked-by: Jiri Pirko <jiri@resnulli.us> Signed-off-by: Felix Fietkau <nbd@openwrt.org> Signed-off-by: Jamal Hadi Salim <jhs@mojatatu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | tc: cls_bpf: rename bpf_len to bpf_num_opsJiri Pirko2015-01-171-9/+9
| | | | | | | | | | | | | | | | | | | | It was suggested by DaveM to change the name as "len" might indicate unit bytes. Suggested-by: David Miller <davem@davemloft.net> Signed-off-by: Jiri Pirko <jiri@resnulli.us> Acked-by: Daniel Borkmann <dborkman@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | tc: add BPF based actionJiri Pirko2015-01-173-0/+218
| | | | | | | | | | | | | | This action provides a possibility to exec custom BPF code. Signed-off-by: Jiri Pirko <jiri@resnulli.us> Signed-off-by: David S. Miller <davem@davemloft.net>
* | net: rename vlan_tx_* helpers since "tx" is misleading thereJiri Pirko2015-01-131-1/+1
| | | | | | | | | | | | | | The same macros are used for rx as well. So rename it. Signed-off-by: Jiri Pirko <jiri@resnulli.us> Signed-off-by: David S. Miller <davem@davemloft.net>
* | net: sched: fix skb->protocol use in case of accelerated vlan pathJiri Pirko2015-01-137-13/+13
| | | | | | | | | | | | | | | | | | | | | | | | | | | | tc code implicitly considers skb->protocol even in case of accelerated vlan paths and expects vlan protocol type here. However, on rx path, if the vlan header was already stripped, skb->protocol contains value of next header. Similar situation is on tx path. So for skbs that use skb->vlan_tci for tagging, use skb->vlan_proto instead. Reported-by: Jamal Hadi Salim <jhs@mojatatu.com> Signed-off-by: Jiri Pirko <jiri@resnulli.us> Acked-by: Jamal Hadi Salim <jhs@mojatatu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | net: sched: sch_teql: Remove unused functionRickard Strandqvist2015-01-121-7/+0
|/ | | | | | | | | Remove the function teql_neigh_release() that is not used anywhere. This was partially found by using a static code analysis program called cppcheck. Signed-off-by: Rickard Strandqvist <rickard_strandqvist@spectrumdigital.se> Signed-off-by: David S. Miller <davem@davemloft.net>
* Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netDavid S. Miller2014-12-102-4/+5
|\ | | | | | | | | | | | | | | | | | | Conflicts: drivers/net/ethernet/amd/xgbe/xgbe-desc.c drivers/net/ethernet/renesas/sh_eth.c Overlapping changes in both conflict cases. Signed-off-by: David S. Miller <davem@davemloft.net>
| * net: fix suspicious rcu_dereference_check in net/sched/sch_fq_codel.cValdis.Kletnieks@vt.edu2014-12-091-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | commit 46e5da40ae (net: qdisc: use rcu prefix and silence sparse warnings) triggers a spurious warning: net/sched/sch_fq_codel.c:97 suspicious rcu_dereference_check() usage! The code should be using the _bh variant of rcu_dereference. Signed-off-by: Valdis Kletnieks <valdis.kletnieks@vt.edu> Acked-by: Eric Dumazet <edumazet@google.com> Acked-by: John Fastabend <john.r.fastabend@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
| * Update old iproute2 and Xen Remus linksAndrew Shewmaker2014-12-091-3/+4
| | | | | | | | | | | | Signed-off-by: Andrew Shewmaker <agshew@gmail.com> Acked-by: Stephen Hemminger <stephen@networkplumber.org> Signed-off-by: David S. Miller <davem@davemloft.net>
* | net: sched: cls: use nla_nest_cancel instead of nlmsg_trimJiri Pirko2014-12-096-13/+8
| | | | | | | | | | | | | | To cancel nesting, this function is more convenient. Signed-off-by: Jiri Pirko <jiri@resnulli.us> Signed-off-by: David S. Miller <davem@davemloft.net>
* | net: sched: cls_basic: fix error path in basic_change()Jiri Pirko2014-12-091-3/+2
| | | | | | | | | | | | Signed-off-by: Jiri Pirko <jiri@resnulli.us> Reviewed-by: John Fastabend <john.r.fastabend@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | net: sched: cls: remove unused op put from tcf_proto_opsJiri Pirko2014-12-099-48/+0
| | | | | | | | | | | | | | | | It is never called and implementations are void. So just remove it. Signed-off-by: Jiri Pirko <jiri@resnulli.us> Signed-off-by: Jamal Hadi Salim <jhs@mojatatu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | net_sched: cls_cgroup: remove unnecessary ifJiri Pirko2014-12-081-5/+1
| | | | | | | | | | | | | | | | since head->handle == handle (checked before), just assign handle. Signed-off-by: Jiri Pirko <jiri@resnulli.us> Acked-by: Jamal Hadi Salim <jhs@mojatatu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | net_sched: cls_flow: remove duplicate assignmentsJiri Pirko2014-12-081-3/+0
| | | | | | | | | | Signed-off-by: Jiri Pirko <jiri@resnulli.us> Signed-off-by: David S. Miller <davem@davemloft.net>
* | net_sched: cls_flow: remove faulty use of list_for_each_entry_rcuJiri Pirko2014-12-081-2/+2
| | | | | | | | | | | | | | | | rcu variant is not correct here. The code is called by updater (rtnl lock is held), not by reader (no rcu_read_lock is held). Signed-off-by: Jiri Pirko <jiri@resnulli.us> Signed-off-by: David S. Miller <davem@davemloft.net>
* | net_sched: cls_bpf: remove faulty use of list_for_each_entry_rcuJiri Pirko2014-12-081-2/+2
| | | | | | | | | | | | | | | | | | | | rcu variant is not correct here. The code is called by updater (rtnl lock is held), not by reader (no rcu_read_lock is held). Signed-off-by: Jiri Pirko <jiri@resnulli.us> ACKed-by: Jamal Hadi Salim <jhs@mojatatu.com> Acked-by: Daniel Borkmann <dborkman@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-02 07:19:04 +0000