1. 06 Dec, 2014 13 commits
    • Alexei Starovoitov's avatar
      samples: bpf: large eBPF program in C · fbe33108
      Alexei Starovoitov authored
      sockex2_kern.c is purposefully large eBPF program in C.
      llvm compiles ~200 lines of C code into ~300 eBPF instructions.
      
      It's similar to __skb_flow_dissect() to demonstrate that complex packet parsing
      can be done by eBPF.
      Then it uses (struct flow_keys)->dst IP address (or hash of ipv6 dst) to keep
      stats of number of packets per IP.
      User space loads eBPF program, attaches it to loopback interface and prints
      dest_ip->#packets stats every second.
      
      Usage:
      $sudo samples/bpf/sockex2
      ip 127.0.0.1 count 19
      ip 127.0.0.1 count 178115
      ip 127.0.0.1 count 369437
      ip 127.0.0.1 count 559841
      ip 127.0.0.1 count 750539
      Signed-off-by: default avatarAlexei Starovoitov <ast@plumgrid.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      fbe33108
    • Alexei Starovoitov's avatar
      samples: bpf: trivial eBPF program in C · a8085782
      Alexei Starovoitov authored
      this example does the same task as previous socket example
      in assembler, but this one does it in C.
      
      eBPF program in kernel does:
          /* assume that packet is IPv4, load one byte of IP->proto */
          int index = load_byte(skb, ETH_HLEN + offsetof(struct iphdr, protocol));
          long *value;
      
          value = bpf_map_lookup_elem(&my_map, &index);
          if (value)
              __sync_fetch_and_add(value, 1);
      
      Corresponding user space reads map[tcp], map[udp], map[icmp]
      and prints protocol stats every second
      Signed-off-by: default avatarAlexei Starovoitov <ast@plumgrid.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      a8085782
    • Alexei Starovoitov's avatar
      samples: bpf: elf_bpf file loader · 249b812d
      Alexei Starovoitov authored
      simple .o parser and loader using BPF syscall.
      .o is a standard ELF generated by LLVM backend
      
      It parses elf file compiled by llvm .c->.o
      - parses 'maps' section and creates maps via BPF syscall
      - parses 'license' section and passes it to syscall
      - parses elf relocations for BPF maps and adjusts BPF_LD_IMM64 insns
        by storing map_fd into insn->imm and marking such insns as BPF_PSEUDO_MAP_FD
      - loads eBPF programs via BPF syscall
      
      One ELF file can contain multiple BPF programs.
      
      int load_bpf_file(char *path);
      populates prog_fd[] and map_fd[] with FDs received from bpf syscall
      
      bpf_helpers.h - helper functions available to eBPF programs written in C
      Signed-off-by: default avatarAlexei Starovoitov <ast@plumgrid.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      249b812d
    • Alexei Starovoitov's avatar
      samples: bpf: example of stateful socket filtering · 03f4723e
      Alexei Starovoitov authored
      this socket filter example does:
      - creates arraymap in kernel with key 4 bytes and value 8 bytes
      
      - loads eBPF program which assumes that packet is IPv4 and loads one byte of
        IP->proto from the packet and uses it as a key in a map
      
        r0 = skb->data[ETH_HLEN + offsetof(struct iphdr, protocol)];
        *(u32*)(fp - 4) = r0;
        value = bpf_map_lookup_elem(map_fd, fp - 4);
        if (value)
             (*(u64*)value) += 1;
      
      - attaches this program to raw socket
      
      - every second user space reads map[IPPROTO_TCP], map[IPPROTO_UDP], map[IPPROTO_ICMP]
        to see how many packets of given protocol were seen on loopback interface
      
      Usage:
      $sudo samples/bpf/sock_example
      TCP 0 UDP 0 ICMP 0 packets
      TCP 187600 UDP 0 ICMP 4 packets
      TCP 376504 UDP 0 ICMP 8 packets
      TCP 563116 UDP 0 ICMP 12 packets
      TCP 753144 UDP 0 ICMP 16 packets
      Signed-off-by: default avatarAlexei Starovoitov <ast@plumgrid.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      03f4723e
    • Alexei Starovoitov's avatar
      net: sock: allow eBPF programs to be attached to sockets · 89aa0758
      Alexei Starovoitov authored
      introduce new setsockopt() command:
      
      setsockopt(sock, SOL_SOCKET, SO_ATTACH_BPF, &prog_fd, sizeof(prog_fd))
      
      where prog_fd was received from syscall bpf(BPF_PROG_LOAD, attr, ...)
      and attr->prog_type == BPF_PROG_TYPE_SOCKET_FILTER
      
      setsockopt() calls bpf_prog_get() which increments refcnt of the program,
      so it doesn't get unloaded while socket is using the program.
      
      The same eBPF program can be attached to multiple sockets.
      
      User task exit automatically closes socket which calls sk_filter_uncharge()
      which decrements refcnt of eBPF program
      Signed-off-by: default avatarAlexei Starovoitov <ast@plumgrid.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      89aa0758
    • Alexei Starovoitov's avatar
      bpf: verifier: add checks for BPF_ABS | BPF_IND instructions · ddd872bc
      Alexei Starovoitov authored
      introduce program type BPF_PROG_TYPE_SOCKET_FILTER that is used
      for attaching programs to sockets where ctx == skb.
      
      add verifier checks for ABS/IND instructions which can only be seen
      in socket filters, therefore the check:
        if (env->prog->aux->prog_type != BPF_PROG_TYPE_SOCKET_FILTER)
          verbose("BPF_LD_ABS|IND instructions are only allowed in socket filters\n");
      Signed-off-by: default avatarAlexei Starovoitov <ast@plumgrid.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      ddd872bc
    • Jason Wang's avatar
      tun/macvtap: use consume_skb() instead of kfree_skb() when needed · f51a5e82
      Jason Wang authored
      To be more friendly with drop monitor, we should only call kfree_skb() when
      the packets were dropped and use consume_skb() in other cases.
      
      Cc: Eric Dumazet <eric.dumazet@gmail.com>
      Signed-off-by: default avatarJason Wang <jasowang@redhat.com>
      Acked-by: default avatarMichael S. Tsirkin <mst@redhat.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      f51a5e82
    • Markus Elfring's avatar
      net-PA Semi: Deletion of unnecessary checks before the function call "pci_dev_put" · 6db16718
      Markus Elfring authored
      The pci_dev_put() function tests whether its argument is NULL
      and then returns immediately. Thus the test around the call
      is not needed.
      
      This issue was detected by using the Coccinelle software.
      Signed-off-by: default avatarMarkus Elfring <elfring@users.sourceforge.net>
      Acked-by: default avatarOlof Johansson <olof@lixom.net>
      Acked-by: default avatarLuis R. Rodriguez <mcgrof@suse.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      6db16718
    • Markus Elfring's avatar
      net-ipvlan: Deletion of an unnecessary check before the function call "free_percpu" · 04901cea
      Markus Elfring authored
      The free_percpu() function tests whether its argument is NULL and then
      returns immediately. Thus the test around the call is not needed.
      
      This issue was detected by using the Coccinelle software.
      Signed-off-by: default avatarMarkus Elfring <elfring@users.sourceforge.net>
      Acked-by: default avatarMahesh Bandewar <maheshb@google.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      04901cea
    • Markus Elfring's avatar
      net: cassini: Deletion of an unnecessary check before the function call "vfree" · 39af455d
      Markus Elfring authored
      The vfree() function performs also input parameter validation.
      Thus the test around the call is not needed.
      
      This issue was detected by using the Coccinelle software.
      Signed-off-by: default avatarMarkus Elfring <elfring@users.sourceforge.net>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      39af455d
    • Andy Shevchenko's avatar
      stmmac: pci: allocate memory resources dynamically · c4b2b9a8
      Andy Shevchenko authored
      Instead of using global variables we are going to use dynamically allocated
      memory. It allows to append a support of more than one ethernet adapter which
      might have different settings simultaniously.
      Signed-off-by: default avatarAndy Shevchenko <andriy.shevchenko@linux.intel.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      c4b2b9a8
    • David S. Miller's avatar
      Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-next · 244ebd9f
      David S. Miller authored
      Pablo Neira Ayuso says:
      
      ====================
      Netfilter updates for net-next
      
      The following batch contains netfilter updates for net-next. Basically,
      enhancements for xt_recent, skip zeroing of timer in conntrack, fix
      linking problem with recent redirect support for nf_tables, ipset
      updates and a couple of cleanups. More specifically, they are:
      
      1) Rise maximum number per IP address to be remembered in xt_recent
         while retaining backward compatibility, from Florian Westphal.
      
      2) Skip zeroing timer area in nf_conn objects, also from Florian.
      
      3) Inspect IPv4 and IPv6 traffic from the bridge to allow filtering using
         using meta l4proto and transport layer header, from Alvaro Neira.
      
      4) Fix linking problems in the new redirect support when CONFIG_IPV6=n
         and IP6_NF_IPTABLES=n.
      
      And ipset updates from Jozsef Kadlecsik:
      
      5) Support updating element extensions when the set is full (fixes
         netfilter bugzilla id 880).
      
      6) Fix set match with 32-bits userspace / 64-bits kernel.
      
      7) Indicate explicitly when /0 networks are supported in ipset.
      
      8) Simplify cidr handling for hash:*net* types.
      
      9) Allocate the proper size of memory when /0 networks are supported.
      
      10) Explicitly add padding elements to hash:net,net and hash:net,port,
          because the elements must be u32 sized for the used hash function.
      
      Jozsef is also cooking ipset RCU conversion which should land soon if
      they reach the merge window in time.
      ====================
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      244ebd9f
    • David S. Miller's avatar
      Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/jkirsher/net-next · ddd5c50f
      David S. Miller authored
      Jeff Kirsher says:
      
      ====================
      Intel Wired LAN Driver Updates 2014-12-05
      
      This series contains updates to ixgbe and ixgbevf.
      
      Alex provides a couple of patches to cleanup ixgbe.  First cleans up the
      page reuse code getting it into a state where all the workarounds needed
      are in place as well as cleaning up a few minor oversights such as using
      __free_pages instead of put_page to drop a locally allocated page.  Then
      cleans up the tail writes for the ixgbe descriptor queues.
      
      Mark Peterson adds support to lookup MAC addresses in Open Firmware or
      IDPROM.
      
      Emil provides patches for ixgbe and ixgbevf to fix an issue on rmmod and
      to add support for X550 in the VF driver.  First removes the read/write
      operations to the CIAA/D registers since it can block access to the PCI
      config space and make use of standard kernel functions for accessing the
      PCI config space.  Then fixes an issue where the driver has logic to free
      up used data in case any of the checks in ixgbe_probe() fail, however
      there is a similar set of cleanups that can occur on driver unload in
      ixgbe_remove() which can cause the rmmod command to crash.
      
      Don provides the remaining patches in the series to complete the addition
      of X550 support into the ixgbe driver.
      ====================
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      ddd5c50f
  2. 05 Dec, 2014 14 commits
  3. 03 Dec, 2014 13 commits