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* bpf: refactor bpf_prog_get and type check into helperDaniel Borkmann2016-07-011-5/+1
| | | | | | | | | | | | | | | | Since bpf_prog_get() and program type check is used in a couple of places, refactor this into a small helper function that we can make use of. Since the non RO prog->aux part is not used in performance critical paths and a program destruction via RCU is rather very unlikley when doing the put, we shouldn't have an issue just doing the bpf_prog_get() + prog->type != type check, but actually not taking the ref at all (due to being in fdget() / fdput() section of the bpf fd) is even cleaner and makes the diff smaller as well, so just go for that. Callsites are changed to make use of the new helper where possible. Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
* packet: use common code for virtio_net_hdr and skb GSO conversionMike Rapoport2016-06-111-34/+2
| | | | | | | | Replace open coded conversion between virtio_net_hdr to skb GSO info with virtio_net_hdr_from_skb Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* packet: compat support for sock_fprogWillem de Bruijn2016-06-101-0/+25
| | | | | | | | | | | | | | | | | Socket option PACKET_FANOUT_DATA takes a struct sock_fprog as argument if PACKET_FANOUT has mode PACKET_FANOUT_CBPF. This structure contains a pointer into user memory. If userland is 32-bit and kernel is 64-bit the two disagree about the layout of struct sock_fprog. Add compat setsockopt support to convert a 32-bit compat_sock_fprog to a 64-bit sock_fprog. This is analogous to compat_sock_fprog support for SO_REUSEPORT added in commit 1957598840f4 ("soreuseport: add compat case for setsockopt SO_ATTACH_REUSEPORT_CBPF"). Reported-by: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by: Willem de Bruijn <willemb@google.com> Acked-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. Miller2016-04-241-0/+1
|\ | | | | | | | | | | | | | | | | | | | | Conflicts were two cases of simple overlapping changes, nothing serious. In the UDP case, we need to add a hlist_add_tail_rcu() to linux/rculist.h, because we've moved UDP socket handling away from using nulls lists. Signed-off-by: David S. Miller <davem@davemloft.net>
| * packet: fix heap info leak in PACKET_DIAG_MCLIST sock_diag interfaceMathias Krause2016-04-141-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Because we miss to wipe the remainder of i->addr[] in packet_mc_add(), pdiag_put_mclist() leaks uninitialized heap bytes via the PACKET_DIAG_MCLIST netlink attribute. Fix this by explicitly memset(0)ing the remaining bytes in i->addr[]. Fixes: eea68e2f1a00 ("packet: Report socket mclist info via diag module") Signed-off-by: Mathias Krause <minipli@googlemail.com> Cc: Eric W. Biederman <ebiederm@xmission.com> Cc: Pavel Emelyanov <xemul@parallels.com> Acked-by: Pavel Emelyanov <xemul@virtuozzo.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | packet: uses kfree_skb() for errors.Weongyo Jeong2016-04-141-2/+12
| | | | | | | | | | | | | | | | | | | | consume_skb() isn't for error cases that kfree_skb() is more proper one. At this patch, it fixed tpacket_rcv() and packet_rcv() to be consistent for error or non-error cases letting perf trace its event properly. Signed-off-by: Weongyo Jeong <weongyo.linux@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netDavid S. Miller2016-04-091-1/+1
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| * af_packet: tone down the Tx-ring unsupported spew.Dave Jones2016-04-061-1/+1
| | | | | | | | | | | | | | | | | | | | | | Trinity and other fuzzers can hit this WARN on far too easily, resulting in a tainted kernel that hinders automated fuzzing. Replace it with a rate-limited printk. Signed-off-by: Dave Jones <davej@codemonkey.org.uk> Acked-by: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by: David S. Miller <davem@davemloft.net>
* | sock: enable timestamping using control messagesSoheil Hassas Yeganeh2016-04-041-5/+25
|/ | | | | | | | | | | | | | | | | | | | | | | Currently, SOL_TIMESTAMPING can only be enabled using setsockopt. This is very costly when users want to sample writes to gather tx timestamps. Add support for enabling SO_TIMESTAMPING via control messages by using tsflags added in `struct sockcm_cookie` (added in the previous patches in this series) to set the tx_flags of the last skb created in a sendmsg. With this patch, the timestamp recording bits in tx_flags of the skbuff is overridden if SO_TIMESTAMPING is passed in a cmsg. Please note that this is only effective for overriding the recording timestamps flags. Users should enable timestamp reporting (e.g., SOF_TIMESTAMPING_SOFTWARE | SOF_TIMESTAMPING_OPT_ID) using socket options and then should ask for SOF_TIMESTAMPING_TX_* using control messages per sendmsg to sample timestamps for each write. Signed-off-by: Soheil Hassas Yeganeh <soheil@google.com> Acked-by: Willem de Bruijn <willemb@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* packet: validate variable length ll headersWillem de Bruijn2016-03-101-25/+18
| | | | | | | | | | | | | | | | Replace link layer header validation check ll_header_truncate with more generic dev_validate_header. Validation based on hard_header_len incorrectly drops valid packets in variable length protocols, such as AX25. dev_validate_header calls header_ops.validate for such protocols to ensure correctness below hard_header_len. See also http://comments.gmane.org/gmane.linux.network/401064 Fixes 9c7077622dd9 ("packet: make packet_snd fail on len smaller than l2 header") Signed-off-by: Willem de Bruijn <willemb@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: core: use __ethtool_get_ksettingsDavid Decotigny2016-02-261-6/+5
| | | | | Signed-off-by: David Decotigny <decot@googlers.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* packet: tpacket_snd gso and checksum offloadWillem de Bruijn2016-02-091-16/+37
| | | | | | | | | | | | | | | | | | Support socket option PACKET_VNET_HDR together with PACKET_TX_RING. When enabled, a struct virtio_net_hdr is expected to precede the data in the ring. The vnet option must be set before the ring is created. The implementation reuses the existing skb_copy_bits code that is used when dev->hard_header_len is non-zero. Move this ll_header check to before the skb alloc and combine it with a test for vnet_hdr->hdr_len. Allocate and copy the max of the two. Verified with test program at github.com/wdebruij/kerneltools/blob/master/tests/psock_txring_vnet.c Signed-off-by: Willem de Bruijn <willemb@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* packet: parse tpacket header before skb allocWillem de Bruijn2016-02-091-46/+65
| | | | | | | | | | | | | | GSO packet headers must be stored in the linear skb segment. Move tpacket header parsing before sock_alloc_send_skb. The GSO follow-on patch will later increase the skb linear argument to sock_alloc_send_skb if needed for large packets. The header parsing code does not require an allocated skb, so is safe to move. Later pass to tpacket_fill_skb the computed data start and length. Signed-off-by: Willem de Bruijn <willemb@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* packet: vnet_hdr support for tpacket_rcvWillem de Bruijn2016-02-091-4/+15
| | | | | | | | | | | | | | | | | | Support socket option PACKET_VNET_HDR together with PACKET_RX_RING. When enabled, a struct virtio_net_hdr will precede the data in the packet ring slots. Verified with test program at github.com/wdebruij/kerneltools/blob/master/tests/psock_rxring_vnet.c pkt: 1454269209.798420 len=5066 vnet: gso_type=tcpv4 gso_size=1448 hlen=66 ecn=off csum: start=34 off=16 eth: proto=0x800 ip: src=<masked> dst=<masked> proto=6 len=5052 Signed-off-by: Willem de Bruijn <willemb@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* packet: move vnet_hdr code to helper functionsWillem de Bruijn2016-02-091-113/+148
| | | | | | | | | | | | | packet_snd and packet_rcv support virtio net headers for GSO. Move this logic into helper functions to be able to reuse it in tpacket_snd and tpacket_rcv. This is a straighforward code move with one exception. Instead of creating and passing a separate gso_type variable, reuse vnet_hdr.gso_type after conversion from virtio to kernel gso type. Signed-off-by: Willem de Bruijn <willemb@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* packet: Allow packets with only a header (but no payload)Martin Blumenstingl2015-11-301-2/+2
| | | | | | | | | | | | | | | | Commit 9c7077622dd91 ("packet: make packet_snd fail on len smaller than l2 header") added validation for the packet size in packet_snd. This change enforces that every packet needs a header (with at least hard_header_len bytes) plus a payload with at least one byte. Before this change the payload was optional. This fixes PPPoE connections which do not have a "Service" or "Host-Uniq" configured (which is violating the spec, but is still widely used in real-world setups). Those are currently failing with the following message: "pppd: packet size is too short (24 <= 24)" Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* packet: Use PAGE_ALIGNED macroTobias Klauser2015-11-171-1/+1
| | | | | | | Use PAGE_ALIGNED(...) instead of open-coding it. Signed-off-by: Tobias Klauser <tklauser@distanz.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
* packet: Don't check frames_per_block against negative valuesTobias Klauser2015-11-171-2/+2
| | | | | | | | | rb->frames_per_block is an unsigned int, thus can never be negative. Also fix spacing in the calculation of frames_per_block. Signed-off-by: Tobias Klauser <tklauser@distanz.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
* packet: fix tpacket_snd max frame lenDaniel Borkmann2015-11-161-4/+5
| | | | | | | | | | | | | | | | | | | Since it's introduction in commit 69e3c75f4d54 ("net: TX_RING and packet mmap"), TX_RING could be used from SOCK_DGRAM and SOCK_RAW side. When used with SOCK_DGRAM only, the size_max > dev->mtu + reserve check should have reserve as 0, but currently, this is unconditionally set (in it's original form as dev->hard_header_len). I think this is not correct since tpacket_fill_skb() would then take dev->mtu and dev->hard_header_len into account for SOCK_DGRAM, the extra VLAN_HLEN could be possible in both cases. Presumably, the reserve code was copied from packet_snd(), but later on missed the check. Make it similar as we have it in packet_snd(). Fixes: 69e3c75f4d54 ("net: TX_RING and packet mmap") Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Willem de Bruijn <willemb@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* packet: infer protocol from ethernet header if unsetDaniel Borkmann2015-11-161-0/+11
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | In case no struct sockaddr_ll has been passed to packet socket's sendmsg() when doing a TX_RING flush run, then skb->protocol is set to po->num instead, which is the protocol passed via socket(2)/bind(2). Applications only xmitting can go the path of allocating the socket as socket(PF_PACKET, <mode>, 0) and do a bind(2) on the TX_RING with sll_protocol of 0. That way, register_prot_hook() is neither called on creation nor on bind time, which saves cycles when there's no interest in capturing anyway. That leaves us however with po->num 0 instead and therefore the TX_RING flush run sets skb->protocol to 0 as well. Eric reported that this leads to problems when using tools like trafgen over bonding device. I.e. the bonding's hash function could invoke the kernel's flow dissector, which depends on skb->protocol being properly set. In the current situation, all the traffic is then directed to a single slave. Fix it up by inferring skb->protocol from the Ethernet header when not set and we have ARPHRD_ETHER device type. This is only done in case of SOCK_RAW and where we have a dev->hard_header_len length. In case of ARPHRD_ETHER devices, this is guaranteed to cover ETH_HLEN, and therefore being accessed on the skb after the skb_store_bits(). Reported-by: Eric Dumazet <edumazet@google.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Willem de Bruijn <willemb@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* packet: only allow extra vlan len on ethernet devicesDaniel Borkmann2015-11-161-35/+25
| | | | | | | | | | | | | | | | | | | | Packet sockets can be used by various net devices and are not really restricted to ARPHRD_ETHER device types. However, when currently checking for the extra 4 bytes that can be transmitted in VLAN case, our assumption is that we generally probe on ARPHRD_ETHER devices. Therefore, before looking into Ethernet header, check the device type first. This also fixes the issue where non-ARPHRD_ETHER devices could have no dev->hard_header_len in TX_RING SOCK_RAW case, and thus the check would test unfilled linear part of the skb (instead of non-linear). Fixes: 57f89bfa2140 ("network: Allow af_packet to transmit +4 bytes for VLAN packets.") Fixes: 52f1454f629f ("packet: allow to transmit +4 byte in TX_RING slot for VLAN case") Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Willem de Bruijn <willemb@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* packet: always probe for transport headerDaniel Borkmann2015-11-161-4/+3
| | | | | | | | | | | | | | | We concluded that the skb_probe_transport_header() should better be called unconditionally. Avoiding the call into the flow dissector has also not really much to do with the direct xmit mode. While it seems that only virtio_net code makes use of GSO from non RX/TX ring packet socket paths, we should probe for a transport header nevertheless before they hit devices. Reference: http://thread.gmane.org/gmane.linux.network/386173/ Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Jason Wang <jasowang@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* packet: do skb_probe_transport_header when we actually have dataDaniel Borkmann2015-11-161-2/+3
| | | | | | | | | | | | | | | | In tpacket_fill_skb() commit c1aad275b029 ("packet: set transport header before doing xmit") and later on 40893fd0fd4e ("net: switch to use skb_probe_transport_header()") was probing for a transport header on the skb from a ring buffer slot, but at a time, where the skb has _not even_ been filled with data yet. So that call into the flow dissector is pretty useless. Lets do it after we've set up the skb frags. Fixes: c1aad275b029 ("packet: set transport header before doing xmit") Reported-by: Eric Dumazet <edumazet@google.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Jason Wang <jasowang@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* packet: race condition in packet_bindFrancesco Ruggeri2015-11-051-31/+49
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | There is a race conditions between packet_notifier and packet_bind{_spkt}. It happens if packet_notifier(NETDEV_UNREGISTER) executes between the time packet_bind{_spkt} takes a reference on the new netdevice and the time packet_do_bind sets po->ifindex. In this case the notification can be missed. If this happens during a dev_change_net_namespace this can result in the netdevice to be moved to the new namespace while the packet_sock in the old namespace still holds a reference on it. When the netdevice is later deleted in the new namespace the deletion hangs since the packet_sock is not found in the new namespace' &net->packet.sklist. It can be reproduced with the script below. This patch makes packet_do_bind check again for the presence of the netdevice in the packet_sock's namespace after the synchronize_net in unregister_prot_hook. More in general it also uses the rcu lock for the duration of the bind to stop dev_change_net_namespace/rollback_registered_many from going past the synchronize_net following unlist_netdevice, so that no NETDEV_UNREGISTER notifications can happen on the new netdevice while the bind is executing. In order to do this some code from packet_bind{_spkt} is consolidated into packet_do_dev. import socket, os, time, sys proto=7 realDev='em1' vlanId=400 if len(sys.argv) > 1: vlanId=int(sys.argv[1]) dev='vlan%d' % vlanId os.system('taskset -p 0x10 %d' % os.getpid()) s = socket.socket(socket.PF_PACKET, socket.SOCK_RAW, proto) os.system('ip link add link %s name %s type vlan id %d' % (realDev, dev, vlanId)) os.system('ip netns add dummy') pid=os.fork() if pid == 0: # dev should be moved while packet_do_bind is in synchronize net os.system('taskset -p 0x20000 %d' % os.getpid()) os.system('ip link set %s netns dummy' % dev) os.system('ip netns exec dummy ip link del %s' % dev) s.close() sys.exit(0) time.sleep(.004) try: s.bind(('%s' % dev, proto+1)) except: print 'Could not bind socket' s.close() os.system('ip netns del dummy') sys.exit(0) os.waitpid(pid, 0) s.close() os.system('ip netns del dummy') sys.exit(0) Signed-off-by: Francesco Ruggeri <fruggeri@arista.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* ipv4: Pass struct net into ip_defrag and ip_check_defragEric W. Biederman2015-10-131-3/+3
| | | | | | | | | | | | | The function ip_defrag is called on both the input and the output paths of the networking stack. In particular conntrack when it is tracking outbound packets from the local machine calls ip_defrag. So add a struct net parameter and stop making ip_defrag guess which network namespace it needs to defragment packets in. Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com> Acked-by: Pablo Neira Ayuso <pablo@netfilter.org> Signed-off-by: David S. Miller <davem@davemloft.net>
* packet: fix match_fanout_group()Eric Dumazet2015-10-131-3/+3
| | | | | | | | | | | | | | | | | | Recent TCP listener patches exposed a prior af_packet bug : match_fanout_group() blindly assumes it is always safe to cast sk to a packet socket to compare fanout with af_packet_priv But SYNACK packets can be sent while attached to request_sock, which are smaller than a "struct sock". We can read non existent memory and crash. Fixes: c0de08d04215 ("af_packet: don't emit packet on orig fanout group") Fixes: ca6fb0651883 ("tcp: attach SYNACK messages to request sockets instead of listener") Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Willem de Bruijn <willemb@google.com> Cc: Eric Leblond <eric@regit.org> Signed-off-by: David S. Miller <davem@davemloft.net>
* packet: support per-packet fwmark for af_packet sendmsgEdward Jee2015-10-131-1/+9
| | | | | | | Signed-off-by: Edward Hyunkoo Jee <edjee@google.com> Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Willem de Bruijn <willemb@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* bpf: fix cb access in socket filter programsAlexei Starovoitov2015-10-111-5/+5
| | | | | | | | | | | | | | | | | | | | | eBPF socket filter programs may see junk in 'u32 cb[5]' area, since it could have been used by protocol layers earlier. For socket filter programs used in af_packet we need to clean 20 bytes of skb->cb area if it could be used by the program. For programs attached to TCP/UDP sockets we need to save/restore these 20 bytes, since it's used by protocol layers. Remove SK_RUN_FILTER macro, since it's no longer used. Long term we may move this bpf cb area to per-cpu scratch, but that requires addition of new 'per-cpu load/store' instructions, so not suitable as a short term fix. Fixes: d691f9e8d440 ("bpf: allow programs to write to certain skb fields") Reported-by: Eric Dumazet <edumazet@google.com> Signed-off-by: Alexei Starovoitov <ast@plumgrid.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* bpf, seccomp: prepare for upcoming criu supportDaniel Borkmann2015-10-051-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | The current ongoing effort to dump existing cBPF seccomp filters back to user space requires to hold the pre-transformed instructions like we do in case of socket filters from sk_attach_filter() side, so they can be reloaded in original form at a later point in time by utilities such as criu. To prepare for this, simply extend the bpf_prog_create_from_user() API to hold a flag that tells whether we should store the original or not. Also, fanout filters could make use of that in future for things like diag. While fanout filters already use bpf_prog_destroy(), move seccomp over to them as well to handle original programs when present. Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Cc: Tycho Andersen <tycho.andersen@canonical.com> Cc: Pavel Emelyanov <xemul@parallels.com> Cc: Kees Cook <keescook@chromium.org> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Alexei Starovoitov <ast@plumgrid.com> Tested-by: Tycho Andersen <tycho.andersen@canonical.com> Acked-by: Alexei Starovoitov <ast@plumgrid.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* Fix AF_PACKET ABI breakage in 4.2David Woodhouse2015-09-231-15/+17
| | | | | | | | | | | | | | | | Commit 7d82410950aa ("virtio: add explicit big-endian support to memory accessors") accidentally changed the virtio_net header used by AF_PACKET with PACKET_VNET_HDR from host-endian to big-endian. Since virtio_legacy_is_little_endian() is a very long identifier, define a vio_le macro and use that throughout the code instead of the hard-coded 'false' for little-endian. This restores the ABI to match 4.1 and earlier kernels, and makes my test program work again. Signed-off-by: David Woodhouse <David.Woodhouse@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* packet: add extended BPF fanout modeWillem de Bruijn2015-08-171-0/+31
| | | | | | | | | | | | | Add fanout mode PACKET_FANOUT_EBPF that accepts an en extended BPF program to select a socket. Update the internal eBPF program by passing to socket option SOL_PACKET/PACKET_FANOUT_DATA a file descriptor returned by bpf(). Signed-off-by: Willem de Bruijn <willemb@google.com> Acked-by: Alexei Starovoitov <ast@plumgrid.com> Acked-by: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by: David S. Miller <davem@davemloft.net>
* packet: add classic BPF fanout modeWillem de Bruijn2015-08-172-2/+102
| | | | | | | | | | | | | | | | | | | Add fanout mode PACKET_FANOUT_CBPF that accepts a classic BPF program to select a socket. This avoids having to keep adding special case fanout modes. One example use case is application layer load balancing. The QUIC protocol, for instance, encodes a connection ID in UDP payload. Also add socket option SOL_PACKET/PACKET_FANOUT_DATA that updates data associated with the socket group. Fanout mode PACKET_FANOUT_CBPF is the only user so far. Signed-off-by: Willem de Bruijn <willemb@google.com> Acked-by: Alexei Starovoitov <ast@plumgrid.com> Acked-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netDavid S. Miller2015-08-011-6/+5
|\ | | | | | | | | | | | | | | | | | | | | | | | | Conflicts: arch/s390/net/bpf_jit_comp.c drivers/net/ethernet/ti/netcp_ethss.c net/bridge/br_multicast.c net/ipv4/ip_fragment.c All four conflicts were cases of simple overlapping changes. Signed-off-by: David S. Miller <davem@davemloft.net>
| * packet: tpacket_snd(): fix signed/unsigned comparisonAlexander Drozdov2015-07-291-1/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | tpacket_fill_skb() can return a negative value (-errno) which is stored in tp_len variable. In that case the following condition will be (but shouldn't be) true: tp_len > dev->mtu + dev->hard_header_len as dev->mtu and dev->hard_header_len are both unsigned. That may lead to just returning an incorrect EMSGSIZE errno to the user. Fixes: 52f1454f629fa ("packet: allow to transmit +4 byte in TX_RING slot for VLAN case") Signed-off-by: Alexander Drozdov <al.drozdov@gmail.com> Acked-by: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by: David S. Miller <davem@davemloft.net>
| * packet: missing dev_put() in packet_do_bind()Lars Westerhoff2015-07-281-5/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | When binding a PF_PACKET socket, the use count of the bound interface is always increased with dev_hold in dev_get_by_{index,name}. However, when rebound with the same protocol and device as in the previous bind the use count of the interface was not decreased. Ultimately, this caused the deletion of the interface to fail with the following message: unregister_netdevice: waiting for dummy0 to become free. Usage count = 1 This patch moves the dev_put out of the conditional part that was only executed when either the protocol or device changed on a bind. Fixes: 902fefb82ef7 ('packet: improve socket create/bind latency in some cases') Signed-off-by: Lars Westerhoff <lars.westerhoff@newtec.eu> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Reviewed-by: Daniel Borkmann <dborkman@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | packet: remove handling of tx_ring from prb_shutdown_retire_blk_timer()Tobias Klauser2015-07-301-4/+2
|/ | | | | | | | | Follow e8e85cc5eb57 ("packet: remove handling of tx_ring") and remove the tx_ring parameter from prb_shutdown_retire_blk_timer() as it is only called with tx_ring = 0. Signed-off-by: Tobias Klauser <tklauser@distanz.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
* Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netDavid S. Miller2015-06-241-17/+3
|\ | | | | | | | | | | | | | | | | | | Conflicts: drivers/net/ethernet/mellanox/mlx4/main.c net/packet/af_packet.c Both conflicts were cases of simple overlapping changes. Signed-off-by: David S. Miller <davem@davemloft.net>
| * packet: avoid out of bounds read in round robin fanoutWillem de Bruijn2015-06-211-16/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | PACKET_FANOUT_LB computes f->rr_cur such that it is modulo f->num_members. It returns the old value unconditionally, but f->num_members may have changed since the last store. Ensure that the return value is always < num. When modifying the logic, simplify it further by replacing the loop with an unconditional atomic increment. Fixes: dc99f600698d ("packet: Add fanout support.") Suggested-by: Eric Dumazet <edumazet@google.com> Signed-off-by: Willem de Bruijn <willemb@google.com> Acked-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
| * packet: read num_members once in packet_rcv_fanout()Eric Dumazet2015-06-211-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | We need to tell compiler it must not read f->num_members multiple times. Otherwise testing if num is not zero is flaky, and we could attempt an invalid divide by 0 in fanout_demux_cpu() Note bug was present in packet_rcv_fanout_hash() and packet_rcv_fanout_lb() but final 3.1 had a simple location after commit 95ec3eb417115fb ("packet: Add 'cpu' fanout policy.") Fixes: dc99f600698dc ("packet: Add fanout support.") Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Willem de Bruijn <willemb@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | packet: remove handling of tx_ringManinder Singh2015-06-231-9/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | Remove handling of tx_ring in prb_setup_retire_blk_timer for TPACKET_V3 because init_prb_bdqc is called only for zero tx_ring and thus prb_setup_retire_blk_timer for zero tx_ring only. And also in functon init_prb_bdqc there is no usage of tx_ring. Thus removing tx_ring from init_prb_bdqc. Signed-off-by: Maninder Singh <maninder1.s@samsung.com> Suggested-by: Frans Klaver <fransklaver@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | packet: free packet_rollover after synchronize_netWillem de Bruijn2015-06-212-1/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | Destruction of the po->rollover must be delayed until there are no more packets in flight that can access it. The field is destroyed in packet_release, before synchronize_net. Delay using rcu. Fixes: 0648ab70afe6 ("packet: rollover prepare: per-socket state") Suggested-by: Eric Dumazet <edumazet@google.com> Signed-off-by: Willem de Bruijn <willemb@google.com> Acked-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | net-packet: fix null pointer exception in rollover modeWillem de Bruijn2015-05-181-3/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Rollover can be enabled as flag or mode. Allocate state in both cases. This solves a NULL pointer exception in fanout_demux_rollover on referencing po->rollover if using mode rollover. Also make sure that in rollover mode each silo is tried (contrary to rollover flag, where the main socket is excluded after an initial try_self). Tested: Passes tools/testing/net/psock_fanout.c, which tests both modes and flag. My previous tests were limited to bench_rollover, which only stresses the flag. The test now completes safely. it still gives an error for mode rollover, because it does not expect the new headroom (ROOM_NORMAL) requirement. I will send a separate patch to the test. Fixes: 0648ab70afe6 ("packet: rollover prepare: per-socket state") Signed-off-by: Willem de Bruijn <willemb@google.com> ---- I should have run this test and caught this before submission, of course. Apologies for the oversight. Signed-off-by: David S. Miller <davem@davemloft.net>
* | packet: fix warnings in rollover lock contentionWillem de Bruijn2015-05-141-10/+5
| | | | | | | | | | | | | | | | | | | | | | | | Avoid two xchg calls whose return values were unused, causing a warning on some architectures. The relevant variable is a hint and read without mutual exclusion. This fix makes all writers hold the receive_queue lock. Suggested-by: David S. Miller <davem@davemloft.net> Signed-off-by: Willem de Bruijn <willemb@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | packet: rollover statisticsWillem de Bruijn2015-05-132-1/+21
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Rollover indicates exceptional conditions. Export a counter to inform socket owners of this state. If no socket with sufficient room is found, rollover fails. Also count these events. Finally, also count when flows are rolled over early thanks to huge flow detection, to validate its correctness. Tested: Read counters in bench_rollover on all other tests in the patchset Signed-off-by: Willem de Bruijn <willemb@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | packet: rollover huge flows before small flowsWillem de Bruijn2015-05-132-3/+24
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Migrate flows from a socket to another socket in the fanout group not only when the socket is full. Start migrating huge flows early, to divert possible 4-tuple attacks without affecting normal traffic. Introduce fanout_flow_is_huge(). This detects huge flows, which are defined as taking up more than half the load. It does so cheaply, by storing the rxhashes of the N most recent packets. If over half of these are the same rxhash as the current packet, then drop it. This only protects against 4-tuple attacks. N is chosen to fit all data in a single cache line. Tested: Ran bench_rollover for 10 sec with 1.5 Mpps of single flow input. lpbb5:/export/hda3/willemb# ./bench_rollover -l 1000 -r -s cpu rx rx.k drop.k rollover r.huge r.failed 0 14 14 0 0 0 0 1 20 20 0 0 0 0 2 16 16 0 0 0 0 3 6168824 6168824 0 4867721 4867721 0 4 4867741 4867741 0 0 0 0 5 12 12 0 0 0 0 6 15 15 0 0 0 0 7 17 17 0 0 0 0 Signed-off-by: Willem de Bruijn <willemb@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | packet: rollover lock contention avoidanceWillem de Bruijn2015-05-132-7/+32
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Rollover has to call packet_rcv_has_room on sockets in the fanout group to find a socket to migrate to. This operation is expensive especially if the packet sockets use rings, when a lock has to be acquired. Avoid pounding on the lock by all sockets by temporarily marking a socket as "under memory pressure" when such pressure is detected. While set, only the socket owner may call packet_rcv_has_room on the socket. Once it detects normal conditions, it clears the flag. The socket is not used as a victim by any other socket in the meantime. Under reasonably balanced load, each socket writer frequently calls packet_rcv_has_room and clears its own pressure field. As a backup for when the socket is rarely written to, also clear the flag on reading (packet_recvmsg, packet_poll) if this can be done cheaply (i.e., without calling packet_rcv_has_room). This is only for edge cases. Tested: Ran bench_rollover: a process with 8 sockets in a single fanout group, each pinned to a single cpu that receives one nic recv interrupt. RPS and RFS are disabled. The benchmark uses packet rx_ring, which has to take a lock when determining whether a socket has room. Sent 3.5 Mpps of UDP traffic with sufficient entropy to spread uniformly across the packet sockets (and inserted an iptables rule to drop in PREROUTING to avoid protocol stack processing). Without this patch, all sockets try to migrate traffic to neighbors, causing lock contention when searching for a non- empty neighbor. The lock is the top 9 entries. perf record -a -g sleep 5 - 17.82% bench_rollover [kernel.kallsyms] [k] _raw_spin_lock - _raw_spin_lock - 99.00% spin_lock + 81.77% packet_rcv_has_room.isra.41 + 18.23% tpacket_rcv + 0.84% packet_rcv_has_room.isra.41 + 5.20% ksoftirqd/6 [kernel.kallsyms] [k] _raw_spin_lock + 5.15% ksoftirqd/1 [kernel.kallsyms] [k] _raw_spin_lock + 5.14% ksoftirqd/2 [kernel.kallsyms] [k] _raw_spin_lock + 5.12% ksoftirqd/7 [kernel.kallsyms] [k] _raw_spin_lock + 5.12% ksoftirqd/5 [kernel.kallsyms] [k] _raw_spin_lock + 5.10% ksoftirqd/4 [kernel.kallsyms] [k] _raw_spin_lock + 4.66% ksoftirqd/0 [kernel.kallsyms] [k] _raw_spin_lock + 4.45% ksoftirqd/3 [kernel.kallsyms] [k] _raw_spin_lock + 1.55% bench_rollover [kernel.kallsyms] [k] packet_rcv_has_room.isra.41 On net-next with this patch, this lock contention is no longer a top entry. Most time is spent in the actual read function. Next up are other locks: + 15.52% bench_rollover bench_rollover [.] reader + 4.68% swapper [kernel.kallsyms] [k] memcpy_erms + 2.77% swapper [kernel.kallsyms] [k] packet_lookup_frame.isra.51 + 2.56% ksoftirqd/1 [kernel.kallsyms] [k] memcpy_erms + 2.16% swapper [kernel.kallsyms] [k] tpacket_rcv + 1.93% swapper [kernel.kallsyms] [k] mlx4_en_process_rx_cq Looking closer at the remaining _raw_spin_lock, the cost of probing in rollover is now comparable to the cost of taking the lock later in tpacket_rcv. - 1.51% swapper [kernel.kallsyms] [k] _raw_spin_lock - _raw_spin_lock + 33.41% packet_rcv_has_room + 28.15% tpacket_rcv + 19.54% enqueue_to_backlog + 6.45% __free_pages_ok + 2.78% packet_rcv_fanout + 2.13% fanout_demux_rollover + 2.01% netif_receive_skb_internal Signed-off-by: Willem de Bruijn <willemb@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | packet: rollover only to socket with headroomWillem de Bruijn2015-05-131-17/+59
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Only migrate flows to sockets that have sufficient headroom, where sufficient is defined as having at least 25% empty space. The kernel has three different buffer types: a regular socket, a ring with frames (TPACKET_V[12]) or a ring with blocks (TPACKET_V3). The latter two do not expose a read pointer to the kernel, so headroom is not computed easily. All three needs a different implementation to estimate free space. Tested: Ran bench_rollover for 10 sec with 1.5 Mpps of single flow input. bench_rollover has as many sockets as there are NIC receive queues in the system. Each socket is owned by a process that is pinned to one of the receive cpus. RFS is disabled. RPS is enabled with an identity mapping (cpu x -> cpu x), to count drops with softnettop. lpbb5:/export/hda3/willemb# ./bench_rollover -r -l 1000 -s Press [Enter] to exit cpu rx rx.k drop.k rollover r.huge r.failed 0 16 16 0 0 0 0 1 21 21 0 0 0 0 2 5227502 5227502 0 0 0 0 3 18 18 0 0 0 0 4 6083289 6083289 0 5227496 0 0 5 22 22 0 0 0 0 6 21 21 0 0 0 0 7 9 9 0 0 0 0 Signed-off-by: Willem de Bruijn <willemb@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | packet: rollover prepare: per-socket stateWillem de Bruijn2015-05-132-4/+23
| | | | | | | | | | | | | | | | Replace rollover state per fanout group with state per socket. Future patches will add fields to the new structure. Signed-off-by: Willem de Bruijn <willemb@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | packet: rollover prepare: move code out of callsitesWillem de Bruijn2015-05-131-9/+10
| | | | | | | | | | | | | | | | | | | | | | | | | | | | packet_rcv_fanout calls fanout_demux_rollover twice. Move all rollover logic into the callee to simplify these callsites, especially with upcoming changes. The main differences between the two callsites is that the FLAG variant tests whether the socket previously selected by another mode (RR, RND, HASH, ..) has room before migrating flows, whereas the rollover mode has no original socket to test. Signed-off-by: Willem de Bruijn <willemb@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netDavid S. Miller2015-05-131-3/+6
|\| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Four minor merge conflicts: 1) qca_spi.c renamed the local variable used for the SPI device from spi_device to spi, meanwhile the spi_set_drvdata() call got moved further up in the probe function. 2) Two changes were both adding new members to codel params structure, and thus we had overlapping changes to the initializer function. 3) 'net' was making a fix to sk_release_kernel() which is completely removed in 'net-next'. 4) In net_namespace.c, the rtnl_net_fill() call for GET operations had the command value fixed, meanwhile 'net-next' adjusted the argument signature a bit. This also matches example merge resolutions posted by Stephen Rothwell over the past two days. Signed-off-by: David S. Miller <davem@davemloft.net>
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