1. 25 Jun, 2022 1 commit
  2. 24 Jun, 2022 7 commits
    • Thomas Haller's avatar
    • Thomas Haller's avatar
      platform/netlink: drop nl_socket_set_ext_ack() API · 4f405c5a
      Thomas Haller authored
      We just always want to set this. No need for a setter that is only
      called once.
      4f405c5a
    • Thomas Haller's avatar
      platform/netlink: simplify socket flags and use boolean fields · 9cd986ba
      Thomas Haller authored
      - replace "s_flags" field by explicit boolean fields.
      
      - "s_msg_peek" now is simplified. Previously, we would default
        to peek, unless the user caller nl_socket_disable_msg_peek()
        or set nl_socket_set_msg_buf_size(). Simplify that. We now
        default to peek, unless NL_SOCKET_FLAGS_DISABLE_MSG_PEEK is set.
      
        We have no callers that call nl_socket_set_msg_buf_size(),
        so we can simplify that logic and just enable peeking by default.
      
      - keep "s_auto_ack" field, although it is always TRUE and there
        is no API to toggle that. However, it is kept as a self-documenting
        thing, so we would know the relevant places where auto-ack matters.
      
      - drop nl_socket_disable_msg_peek(). We have no caller of this function
        and we can set peeking in nl_socket_new(). We also don't need to
        change it after creation of the socket.
      9cd986ba
    • Thomas Haller's avatar
      platform/netlink: add flags argument to nl_socket_new() · c09b37f3
      Thomas Haller authored
      The real purpose is that we set the socket options before bind().
      For that, we need to be able to specify the flag during nl_socket_new().
      
      Another reason is that these are common questions to ponder while
      creating a netlink socket. There shouldn't be several setter functions,
      just specify the flag right away. These parameters are not going to
      change afterwards (at least, we don't need/use that and we don't have
      API for that either).
      c09b37f3
    • Thomas Haller's avatar
      platform/netlink: extend nl_nlmsghdr_to_str() for genl messages · 919a61bc
      Thomas Haller authored
      Print more details for generic netlink messages.
      
      Also, pass the group that we obtained via NETLINK_PKTINFO.
      
      Also, factor out simple to-string methods.
      919a61bc
    • Thomas Haller's avatar
      platform/netlink: add reading NETLINK_PKTINFO in nl_recv() · 51b70735
      Thomas Haller authored
      We will need this, for getting nl_pktinfo control messages
      that contain the extended destination group number.
      
      Also, drop NL_SOCK_PASSCRED. It was only used to not iterate over the
      control messages, but doing that should be cheap.
      51b70735
    • Thomas Haller's avatar
      1460adc9
  3. 23 Jun, 2022 3 commits
  4. 17 Jun, 2022 3 commits
    • Thomas Haller's avatar
      platform/netlink: add netlink_protocol argument to nl_nlmsghdr_to_str() · f5d94284
      Thomas Haller authored
      The meaning of the header depends on the netlink protocol. Add that parameter,
      so we can also handle genl.
      f5d94284
    • Thomas Haller's avatar
      platform/netlink: also set NETLINK_EXT_ACK for genl socket · 67d64fd4
      Thomas Haller authored
      There are only two callers of nl_socket_new(). One for NETLINK_GENERIC
      and one for NETLINK_ROUTE.
      
      We already were enabling ext-ack for the rtnetlink socket. Also enable
      it for the genl socket.
      
      Do that, but just moving this inside nl_socket_new(). I cannot imagine a
      case where we don't want this.
      67d64fd4
    • Thomas Haller's avatar
      platform/netlink: combine nl_socket_alloc() and nl_connect() · f96fbc8e
      Thomas Haller authored
      Create and use new nl_socket_new().
      
      nl_socket_alloc() really does nothing but allocating the struct and
      initializing the fd to -1. In all cases, we want to call nl_connect()
      right after.
      
      Combine the two. Then we also cannot  have a "struct nl_sock" without a
      valid fd. This means several error checks can be dropped.
      
      Note that former nl_connect() did several things at once. Maybe, for
      more flexibility one would need to tweak what should be done there.
      For now that is not necessary. In any case, if we need more flexibility,
      then we would control what nl_connect() (now nl_socket_new()) does, and not
      the split between nl_socket_alloc() and nl_connect().
      f96fbc8e
  5. 03 Feb, 2022 2 commits
  6. 20 Jan, 2022 1 commit
    • Thomas Haller's avatar
      Revert "platform: add bpf filter to ignore routes from routing daemons" · c37a21ea
      Thomas Haller authored
      The socket BPF filter operates on the entire message (skb). One netlink
      message (for RTM_NEWROUTE) usually contains a list of routes (struct
      nlmsghdr), but the BPF filter was only looking at the first route to decide
      whether to throw away the entire message. That is wrong.
      
      This causes that we miss routes. It also means that the response to our
      RTM_GETROUTE dump request could be filtered and we poll/wait (unsuccessfully)
      for it:
      
        <trace> [1641829930.4111] platform-linux: netlink: read: wait for ACK for sequence number 26...
      
      To get this right, the BPF filter would have to look at all routes in the
      list to find out whether there are any we want to receive (and if
      there are any, to pass the entire message, regardless that is might also
      contain routes we want to ignore). As BPF does not support loops, that
      is not trivial. Arguably, we still could do something where we look at a
      bounded, unrolled number of routes, in the hope that there are not more
      routes in one message that we support. The problem is that this BPF
      filter is supposed to filter out massive amounts of routes, so most
      messages will be filled to the brim with routes and we would have to
      expect a high number of routes in the RTM_NEWROUTE that need checking.
      
      We could still ignore routes in _new_from_nl_route(), to enter the
      cache. That means, we would catch them later than with the BPF filter,
      but still before a lot of the overhead of handling them. That probably
      will be done next, but for now revert the commit.
      
      This reverts commit e9ca5583.
      
      https://bugzilla.redhat.com/show_bug.cgi?id=2037411
      c37a21ea
  7. 09 Dec, 2021 1 commit
    • Beniamino Galvani's avatar
      platform: add bpf filter to ignore routes from routing daemons · e9ca5583
      Beniamino Galvani authored
      Routing daemons can add a large amount of routes to the
      system. Currently NM receives netlink notifications for all those
      routes and exposes them on D-Bus. With many routes, the daemon becomes
      increasingly slow and uses a lot of memory.
      
      The rtm_protocol field of the route indicates the source of the
      route. From /usr/include/linux/rtnetlink.h, the allowed values are:
      
        #define RTPROT_UNSPEC          0
        #define RTPROT_REDIRECT        1        /* Route installed by ICMP redirects;
                                                   not used by current IPv4 */
        #define RTPROT_KERNEL          2        /* Route installed by kernel */
        #define RTPROT_BOOT            3        /* Route installed during boot */
        #define RTPROT_STATIC          4        /* Route installed by administrator */
      
        /* Values of protocol >= RTPROT_STATIC are not interpreted by kernel;
           they are just passed from user and back as is.
           It will be used by hypothetical multiple routing daemons.
           Note that protocol values should be standardized in order to
           avoid conflicts.
         */
      
        #define RTPROT_GATED           8        /* Apparently, GateD */
        #define RTPROT_RA              9        /* RDISC/ND router advertisements */
        #define RTPROT_MRT            10        /* Merit MRT */
        #define RTPROT_ZEBRA          11        /* Zebra */
        #define RTPROT_BIRD           12        /* BIRD */
        #define RTPROT_DNROUTED       13        /* DECnet routing daemon */
        #define RTPROT_XORP           14        /* XORP */
        #define RTPROT_NTK            15        /* Netsukuku */
        #define RTPROT_DHCP           16        /* DHCP client */
        #define RTPROT_MROUTED        17        /* Multicast daemon */
        #define RTPROT_KEEPALIVED     18        /* Keepalived daemon */
        #define RTPROT_BABEL          42        /* Babel daemon */
        #define RTPROT_OPENR          99        /* Open Routing (Open/R) Routes */
        #define RTPROT_BGP           186        /* BGP Routes */
        #define RTPROT_ISIS          187        /* ISIS Routes */
        #define RTPROT_OSPF          188        /* OSPF Routes */
        #define RTPROT_RIP           189        /* RIP Routes */
        #define RTPROT_EIGRP         192        /* EIGRP Routes */
      
      Since NM uses only values <= RTPROT_STATIC, plus RTPROT_RA and
      RTPROT_DHCP, add a BPF filter to the netlink socket to discard
      notifications for other route types.
      
      https://bugzilla.redhat.com/show_bug.cgi?id=1861527
      !1038
      e9ca5583
  8. 29 Nov, 2021 1 commit
    • Thomas Haller's avatar
      format: reformat source tree with clang-format 13.0 · 615221a9
      Thomas Haller authored and Beniamino Galvani's avatar Beniamino Galvani committed
      We use clang-format for automatic formatting of our source files.
      Since clang-format is actively maintained software, the actual
      formatting depends on the used version of clang-format. That is
      unfortunate and painful, but really unavoidable unless clang-format
      would be strictly bug-compatible.
      
      So the version that we must use is from the current Fedora release, which
      is also tested by our gitlab-ci. Previously, we were using Fedora 34 with
      clang-tools-extra-12.0.1-1.fc34.x86_64.
      
      As Fedora 35 comes along, we need to update our formatting as Fedora 35
      comes with version "13.0.0~rc1-1.fc35".
      An alternative would be to freeze on version 12, but that has different
      problems (like, it's cumbersome to rebuild clang 12 on Fedora 35 and it
      would be cumbersome for our developers which are on Fedora 35 to use a
      clang that they cannot easily install).
      
      The (differently painful) solution is to reformat from time to time, as we
      switch to a new Fedora (and thus clang) version.
      Usually we would expect that such a reformatting brings minor changes.
      But this time, the changes are huge. That is mentioned in the release
      notes [1] as
      
        Makes PointerAligment: Right working with AlignConsecutiveDeclarations. (Fixes https://llvm.org/PR27353)
      
      [1] https://releases.llvm.org/13.0.0/tools/clang/docs/ReleaseNotes.html#clang-format
      615221a9
  9. 17 Aug, 2021 4 commits
  10. 02 Aug, 2021 1 commit
    • Thomas Haller's avatar
      all: rename nm_utils_strbuf_*() API to nm_strbuf_*() · d0ba87a1
      Thomas Haller authored
      The "utils" part does not seem useful in the name.
      
      Note that we also have NMStrBuf, which is named nm_str_buf_*().
      There is an unfortunate similarity between the two, but it's still
      distinct enough (in particular, because one takes an NMStrBuf and
      the other not).
      d0ba87a1
  11. 09 Jul, 2021 1 commit
  12. 01 Jun, 2021 1 commit
    • Thomas Haller's avatar
      platform/netlink: don't reallocate ancillary data for recvmsg() on truncation · 5740ed67
      Thomas Haller authored
      Coverity thinks there is a problem here:
      
          Error: TAINTED_SCALAR (CWE-20): [#def233]
          NetworkManager-1.31.5/src/libnm-platform/nm-netlink.c:1437: tainted_argument: Calling function "recvmsg" taints argument "msg".
          NetworkManager-1.31.5/src/libnm-platform/nm-netlink.c:1458: tainted_data: Passing tainted expression "msg.msg_controllen" to "g_realloc", which uses it as an allocation size.
          NetworkManager-1.31.5/src/libnm-platform/nm-netlink.c:1458: remediation: Ensure that tainted values are properly sanitized, by checking that their values are within a permissible range.
          # 1456|
          # 1457|           msg.msg_controllen *= 2;
          # 1458|->         msg.msg_control = g_realloc(msg.msg_control, msg.msg_controllen);
          # 1459|           goto retry;
          # 1460|       }
      
      but the problem is not the tainted data. The problem is how should
      we handle MSG_CTRUNC? If we reach MSG_CTRUNC we already lost a message.
      Retrying to receive the next message is not going to fix that and is
      wrong.
      
      Also, there really is no reason why any truncation should happen. The only
      ancillary data that should be present is the sender information, and for
      that our buffer is supposed to be large enough.
      
      So, simply ignore truncation. It shouldn't happen, if it happened we
      cannot recover from it (aside failing an assertion), and all we really
      care are the retrieved credentials. If truncation happened, we might
      not have retrieved the credentials, but then that is for the caller
      to handle (by rejecting the message as untrusted).
      
      !872
      5740ed67
  13. 24 Feb, 2021 2 commits
  14. 09 Feb, 2021 1 commit
  15. 15 Jan, 2021 1 commit
    • Thomas Haller's avatar
      shared,platform: add "shared/nm-platform" library · 186f2da2
      Thomas Haller authored
      NetworkManager core is huge. We should try to split out
      parts that are independent.
      
      Platform code is already mostly independent. But due to having it
      under "src/", there is no strict separation/layering which determines
      the parts that can work independently. So, while the code is mostly
      independent (in practice), that is not obvious from looking at the
      source tree. It thus still contributes to cognitive load.
      
      Add a shared library "shared/nm-platform", which should have no
      dependencies on libnm-core or NetworkManager core.
      
      In a first step, move the netlink code there. More should follow.
      186f2da2
  16. 05 Jan, 2021 1 commit
    • Thomas Haller's avatar
      all: update deprecated SPDX license identifiers · 977ea352
      Thomas Haller authored
      These SPDX license identifiers are deprecated ([1]). Update them.
      
      [1] https://spdx.org/licenses/
      
        sed \
           -e '1 s%^/\* SPDX-License-Identifier: \(GPL-2.0\|LGPL-2.1\)+ \*/$%/* SPDX-License-Identifier: \1-or-later */%' \
           -e '1,2 s%^\(--\|#\|//\) SPDX-License-Identifier: \(GPL-2.0\|LGPL-2.1\)+$%\1 SPDX-License-Identifier: \2-or-later%' \
           -i \
           $(git grep -l SPDX-License-Identifier -- \
               ':(exclude)shared/c-*/' \
               ':(exclude)shared/n-*/' \
               ':(exclude)shared/systemd/src' \
               ':(exclude)src/systemd/src')
      977ea352
  17. 29 Sep, 2020 1 commit
    • Thomas Haller's avatar
      all: unify comment style for SPDX-License-Identifier tag · 88071abb
      Thomas Haller authored
      Our coding style recommends C style comments (/* */) instead of C++
      (//). Also, systemd (which we partly fork) uses C style comments for
      the SPDX-License-Identifier.
      
      Unify the style.
      
        $ sed -i '1 s#// SPDX-License-Identifier: \([^ ]\+\)$#/* SPDX-License-Identifier: \1 */#' -- $(git ls-files -- '*.[hc]' '*.[hc]pp')
      88071abb
  18. 28 Sep, 2020 2 commits
  19. 07 Jul, 2020 1 commit
  20. 01 Oct, 2019 1 commit
  21. 10 Sep, 2019 1 commit
  22. 23 Jul, 2019 1 commit
  23. 11 Jun, 2019 1 commit
    • Thomas Haller's avatar
      all: drop emacs file variables from source files · c0e075c9
      Thomas Haller authored
      We no longer add these. If you use Emacs, configure it yourself.
      
      Also, due to our "smart-tab" usage the editor anyway does a subpar
      job handling our tabs. However, on the upside every user can choose
      whatever tab-width he/she prefers. If "smart-tabs" are used properly
      (like we do), every tab-width will work.
      
      No manual changes, just ran commands:
      
          F=($(git grep -l -e '-\*-'))
          sed '1 { /\/\* *-\*-  *[mM]ode.*\*\/$/d }'     -i "${F[@]}"
          sed '1,4 { /^\(#\|--\|dnl\) *-\*- [mM]ode/d }' -i "${F[@]}"
      
      Check remaining lines with:
      
          git grep -e '-\*-'
      
      The ultimate purpose of this is to cleanup our files and eventually use
      SPDX license identifiers. For that, first get rid of the boilerplate lines.
      c0e075c9
  24. 22 Feb, 2019 1 commit